Civil Specification Vol-III

8/10/2019 Civil Specification Vol-III

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THE TATA POWER COMPANY LIMITED

110/33 kV Substation At (Ixora) Panvel

SPECIFICATION NO. TCE. 6349A-H-203-401(P0)

VOLUME III CIVIL WORKS

TATA POWER COMPANY LIMITED TATA CONSULTING ENGINEERS LTD

GIS BUILDING, 4TH

FLOOR, TOWER 34 SANT TUKARAM ROAD, A247 PARK LBS MARG,CARNAC BUNDER, VIKHROLI (WEST),MUMBAI 400 009 MUMBAI - 400 083

FEBRUARY 2011


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SPEC. NO.TCE.6349A-H-203-

401

TATA CONSULTING ENGINEERS LIMITED SECTION:CONTENT

CONSTRUCTION OF 110/33 kV SUB SATION AT (Ixora)

PANVELSHEET i OF x

TCE FORM NO. 329 R5FILE NAME: F329R5.DOC

ISSUE

P0

VOLUME I (GCC, SAFETY MANAGEMENT, ERECTION CONDITIONS, SCC & PRICESCHEDULES)

SEC.NO. SPECIFICATION NO. REV.NO. TITLE

A-1 TCE.6349A-H-203-401 P0 Scope Of Enquiry

A-2 TCE.6349A-950 P0 Project Information - General

A-3 TCE.6349A-H-203-401 P0 Instructions To Bidders

E1 TCE.6349A-H-203-401 P1 Special Conditions Of Contract (SCC)

E2 TCE.6349A-H-203-401 P1 General Conditions Of Contract(GCC)

E3 TCE.6349A-H-203-401 P0 Erection ConditionsGeneral

E4 TCE-M4 -903 R5 Drawings, Engineering Documents andInstruction Manuals

E5 TCE.6349A-H-203-401 P0 Supply Correspondence distribution ScheduleE6 TCE-M4 -904 R9 Shop Inspection and Tests

E7 TCE-M4 -905 R5 Guarantee and Patent Rights

F1 TCE.6349A-H-203-401 P0 Schedule of prices-Civil

F2 TCE.6349A-H-203-401 P0 Schedule of prices-Electrical

F3 TCE.6349A-H-203-401 P0 Schedule of prices-Mechanical

F4 TCE.6349A-H-203-401 P0 Project Schedule

F5 TCE-M4-981 R1 Schedule of Essential and RecommendedSpare Parts

F6 TCE-M4-982 R1 Schedule of Maintenance Tools and TacklesF7 TCE-M4-983 R1 Schedule of Start-Up and CommissioningSpares

F8 TCE-M4-986 R1 Schedule of Time for Manufacturer, Despatchand Shipment to Site.

F9 TCE-M4-992 R1 Schedule of Deviation from GeneralConditions

F10 TCE.6349A-H-203-401 P0 Schedule of Deviation from Special Conditionsof Contract

F11 TCE-M4-996 R7 Schedule of Places of Tests and Inspection.

F12 TCE-M4-997 R4 Schedule of Weights and Dimensions

F13 TCE-M4-998 R5 Schedule of Bidders Experience

Contractor Safety Management

Six Step Safety Document

Heavy Equipment Movement Standard

Scaffold Safety Standard

Shoring and Sloping of Excavations Standard

Working At Heights Standard


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VOLUME IIELECTRICAL WORKS

SEC.

NO.

SPECIFICATION NO.REV

NO.

TITLE

C TCE.6349A-H-203-401 P0 Specific Requirements

C1 ELECTRICAL

C1.1 TCE. 6349A-H- 203-401 Specific requirements Electrical InstallationWork

C1.2 TCE-6349A-735-D-EL-211

P0 33kV Gas Insulated Switchgear

R1 Data Sheet-A1 (33kV GIS)

R1 Data Sheet-A2 (33kV GIS)

R1 Data Sheet-B (33kV GIS)

R3 Data Sheet-C(33kV GIS)

C1.3 TCE.6349A-H-203- 401 P0 Specific requirements Distributiontransformer

R3 Data Sheet-A1

P0 Data Sheet-A2

P0 Data Sheet-B

P0 Data Sheet-C

D TCE-M4-132-01 R4 Emergency Diesel Generator Set

D TCE-M4-203-01 R8 Induction Motor

R8 Data Sheet-A1

R8 Data Sheet-A2

R8 Data Sheet-BR8 Data Sheet-C

D TCE-M4-204-01 R6 Control And Relay Panels / Desks For PowerSystems

R6 Data Sheet-A0

R6 Data Sheet-A1

R6 Data Sheet-A2

R6 Data Sheet-A3

R6 Data Sheet-B

R6 Data Sheet-C

D TCE-M4-204-51 R3 Tri Vector Meter

R3 Data Sheet-A

R3 Data Sheet-B

R3 Data Sheet-C

D TCE-M4-205-01 R7 Outdoor High Voltage Circuit Breaker

R1 Data Sheet-A1

R1 Data Sheet-A2

R1 Data Sheet-B

R7 Data Sheet-C


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SEC.NO.

SPECIFICATION NO.REVNO.

TITLE

D TCE-M4-206-01 R6 High Voltage Disconnector

R1 Data Sheet-A1

R1 Data Sheet-A2

R1 Data Sheet-B

R7 Data Sheet-C

D TCE-M4-207-01 R5 Outdoor Voltage and Current Transformer

R5 Data Sheet-C

D TCE-M4-208-01 R7 Cables

R7 Data Sheet A5

R7 Data Sheet A6

R7 Data Sheet B

R7 Data Sheet C

D TCE-M4-208-10 R1 H. V. Cable Terminations And Joints (3.3kV To33kV)

R1 Data Sheet A1

R1 Data Sheet A2

R1 Data Sheet B

R1 Data Sheet CD TCE-M4-208-11 R3 Cabling Accessories,

Cable Trays, Conduits & Pipes

R3 Data Sheet B

R3 Data Sheet C

D TCE-M4-209-01 R6 DC Switchgear

R6 Data Sheet-A1

R6 Data Sheet-A2

R6 Data Sheet-A3

R6 Data Sheet-B

R6 Data Sheet-CD TCE-M4-212-01 R7 Stationary Lead Acid Storage Battery

R7 Data Sheet-A1

R7 Data Sheet-A2

R7 Data Sheet B

R7 Data Sheet C

D TCE-M4-212-02 R2 Sealed Lead Acid / Nickel Cadmium battery

R2 Data Sheet-A1

R2 Data Sheet-A2

R2 Data Sheet-BR2 Data Sheet-C


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D TCE-M4-213-01 R6 Battery Charger

R5 Data Sheet-A1

R5 Data Sheet-A2

R5 Data Sheet-B

R5 Data Sheet-C

D TCE-M4-214-01 R6 Insulators & insulator fittings

R6 Data Sheet-A1

R5 Data Sheet-A2

R5 Data Sheet-B

D TCE-M4-215-01 R4 Tubular Bus Conductor

R4 Data Sheet-A1

R4 Data Sheet-A2

R4 Data Sheet-B

D TCE-M4-218-01 R6 Lightning Arresters

R1 Data Sheet-A1

R1 Data Sheet-A2

R1 Data Sheet-B

R5 Data Sheet-C

D TCE-M4-219-01 R7 Control Cabinets

R7 Data Sheet-A1

R7 Data Sheet-A2

R7 Data Sheet B

R7 Data Sheet-C

D TCE-M4-219-11 R6 Low Voltage Switchgear

R6 Data Sheet-A1

R6 Data Sheet-A2

R6 Data Sheet-B

R6 Data Sheet-C

D TCE-M4-221-01 R6 Lighting Fixtures & AccessoriesR6 Data Sheet A1

R6 Data Sheet A-2

R6 Data Sheet B

D TCE-M4-221-02 R4 Lighting System Equipment

R4 Data Sheet A1

R4 Data Sheet B

R4 Data Sheet C

R4 Data Sheet C

D TCE-M4-225-21 R3 Cabling System Installation WorkR2 Data Sheet A

R2 Data Sheet B


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D TCE-M4-225-22 R3 Earthing & Lightning Protection System-Installation Work

R2 Data Sheet A

D TCE-M4-225-23 R4 Lighting System Installation Work

R4 Data Sheet A1

R4 Data Sheet A2

R4 Data Sheet B

R4 Data Sheet C

D TCE-M4-225-24 R4 Electrical Equipment Installation Work

R4 Data Sheet A2

R4 Data Sheet BD TCE-M4-225-25 R3 Electrical Installation Work

R3 Data Sheet A

D TCE-M4-225-26 R2 Fire Proof Sealing Of Cable Carrier System

R2 Data Sheet-A1

R2 Data Sheet-A2

R2 Data Sheet-A3

R2 Data Sheet-B

R2 Data Sheet-C

D TCE-M4-253-01 R5 Fire Detection & Alarm SystemR5 Data Sheet-A1

R5 Data Sheet-A2

R5 Data Sheet-A3

R5 Data Sheet-A4

R5 Data Sheet-A5

R5 Data Sheet-A6

R5 Data Sheet-A7

R5 Data Sheet-B

R5 Data Sheet-C

D TCE-M4-257-01 R5 AAC, ACSR Copper conductor & steel wires

R5 Data Sheet-A1

R5 Data Sheet-A2

R5 Data Sheet-B

R5 Data Sheet-C

D TCE-M4-258-01 R4 Static Inverter

R4 Data Sheet-A1

R4 Data Sheet-A2

R4 Data Sheet-B

R4 Data Sheet-C


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PANVELSHEET vi OF x


ISSUE

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SEC.NO.


TITLE

F TCE-6349A-H-203-401 R0 Schedule of General Particulars.

F TCE-M4-985 R1 Schedule of Personal for Supervision ofErection, Commissioning, Start Up andPerformance Testing.

F TCE-M4-991 R7 Schedule of Deviation from TechnicalSpecification

F TCE-M4-996 R7 Schedule of Places of Tests and Inspection.

STANDARD DRAWINGS

1. TCE-M2-EL-CT-S-2006 R2 Tre Foil Clamp

2. TCE-M2-EL-CT-S-2007 R2 Cable Tray Mounting General Notes

3. TCE-M2-EL-CT-S-2008 R2 Cable Tray Mounting Arrangement- CTM1

4. TCE-M2-EL-CT-S-2009 R2 Cable Tray Mounting Arrangement- CTM2

5. TCE-M2-EL-CT-S-2013 R2 Cable Tray Mounting Arrangement CTM-6

6. TCE-M2-EL-CT-S-2016 R2 Cable Tray Mounting Arrangement CTMV-1

7. TCE-M2-EL-CT-S-2020 R2 Cable Tray Mounting Support Plate

8. TCE-M2-EL-CT-S-2021 R3 Cable Trays-General Notes

9. TCE-M2-EL-CT-S-2022 R2 Perforated Type Cable Tray-CTP

10. TCE-M2-EL-CT-S-2023 R2 Ladder Type Cable Tray-CTL

11. TCE-M2-EL-CT-S-2024 R2 Connection Details Of Cable Tray Sections

12. TCE-M2-EL-CT-S-2025 R2 Cable Tray Reducer Details

13. TCE-M2-EL-CT-S-2026 R2 Typical Arrangement Of Covering Cable Tray

14. TCE-M2-EL-CT-S-2027 R2 Cable Tray Adjustable Bend

15. TCE-M2-EL-CT-S-2040 R3 Cable Installation Notes

16. TCE-M2-EL-CT-S-2041 R2 Conduit Installation Notes

17. TCE-M2-EL-CT-S-2043 R2 Cable Installation Practice Along Wall / RCCStructure Cable Size < 3C x 70 Sq mm

18. TCE-M2-EL-CT-S-2044 R2 Cable Installation Practice For Power Cable(3C x 70 Sq.mm & Above)

19. TCE-M2-EL-CT-S-2045 R4R2

Installation Practice Of Directly Buried Cables

20. TCE-M2-EL-CT-S-2046 R2 Protection Of Buried Cables At Entry/ ExitPoint To/ From Earth

21. TCE-M2-EL-CT-S-2051 R2 Cable Installation Practice For Bottom EntryTo Switch Boards/ Control Panels

22. TCE-M2-EL-CT-S-2055 R2 Cable Installation Practice In HorizontalTrays

23. TCE-M2-EL-CT-S-2056 R2 Saddle And Spacer Details For Control &Power Cables(Less Than 3C x 70 Sq. mm

24. TCE-M2-EL-CT-S-2057 R Saddle Details for Cables In Group

25. TCE-M2-EL-CT-S-2058 R2 Cable Identification Tag

26. TCE-M2-EL-CT-S-2059 R2 Water Proof Compound Sealing27. TCE-M2-EL-CT-S-2060 R2 Fire Proof Sealing

28. TCE-M2-EL-CT-S-2061 R2 Cable Installation Practice From Outdoor to


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ISSUE

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Indoor

29. TCE-M2-EL-GL-S-2200 R3 Lighting Installation Notes

30. TCE-M2-EL-GL-S-2214 R3 Lighting Details- Type-E1, Post Top LanternPole Mounting

31. TCE-M2-EL-GL-S-2217 R3 Street / Flood Light Pole Junction Boxes

32. TCE-M2-EL-GL-S-2228 R3 Tower for Flood Lighting

33. TCE-M2-EL-GL-S-2350 R3 Earthing and Lightning Protection SystemsInstallation Notes

34. TCE-M2-EL-GL-S-2352 R3 Earthing Details Inserts

35. TCE-M2-EL-GL-S-2353 R3 Earthing Details -Pipe/ Rod Electrode Pit

36. TCE-M2-EL-GL-S-2354 R3 Earthing DetailsDirectly Buried G. I. PipeElectrode

37. TCE-M2-EL-GL-S-2358 R2 Pipe Electrode Connection Details

38. TCE-M2-EL-GL-S-2360 R3 Earthing Details -MCC & Metal cladSwitchgear

39. TCE-M2-EL-GL-S-2362 R3 Earthing DetailsEquipment On RCC/SteelColumn

40. TCE-M2-EL-GL-S-2365 R3 Earthing DetailsTransformer

41. TCE-M2-EL-GL-S-2373 R3 Earthing Details -Fence And Gate

42. TCE-M2-EL-GL-S-2375 R2 Earthing Details -M. S. Flat ConductorConnections

43. TCE-M2-EL-GL-S-2378 R3 Earthing DetailsCleating Earthing/LightningProtection Conductor

44. TCE-M2-EL-GL-S-2379 R2 Earthing DetailsLightning Protect.Down

Comers Test Link45. TCE-M2-EL-GL-S-2631 R1 Float Cum Boost Charger With 2 X 100%

Battery

46. TCE-M2-EL-SK-D-2952 R4 Transformer Oil Pit arrangement

ENGINEERING DRAWINGS

1 TCE-6349A-737-AU-3001 P5 110/33kV R/S AT (IXORA) PANVEL110KV SINGLE LINE DIAGRAM

2 TCE.6349A-735- AU-3002 P1 110/33kV R/S AT (IXORA) PANVEL33 KV MAIN SINGLE LINE DIAGRAM

3 TCE.6349A-717-AU-3003 P0 110/33kV R/S AT (IXORA) PANVELSTATION -415V AC SINGLE LINEDIAGRAM

4 TCE-6349A-718-AU-3004 P0 110/33kV R/S AT (IXORA) PANVEL110V D.C. SINGLE LINE DIAGRAM

5 TCE.6349A-718-AU-3005 P0 110/33kV R/S AT (IXORA) PANVELSTATION- 48V DC UNGROUNDED &GROUNDED SYSTEM

6 TCE.6349A-737-GA-3008 P0 TAP OFF ARRANGEMENT

7 TCE.6349A-737-GA-3009 P0 110kV SWITCHYARD PLAN ANDSECTIONS

8 TCE.6349A-737-GA-3010 P0 CONTROL BUILDING PLAN

9 TCE.6349A-737-GA-3013 P0 EXISTING SITE PLAN10 TCE.6349A-719-GA-3018 P0 ARCHITECTURAL DRAWING FOR

SCADA AT PANVEL SUBSTATION


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ISSUE

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COMMISSIONING CHECK LIST

1. TCE-M8-RB-K-TF-011 R1 TRANSFORMERS

2. TCE-M8-RB-CR-013 R1 CONTROL RANELS

3. TCE-M8-RB-K-RC-014 R1 RELAYS

4. TCE-M8-RB-K-RC-015 R1 METERS

5. TCE-M8-RB-K-CA-020 R1 CABLES

6. TCE-M8-RB-K-SYS-025 R1 ELECTRICAL INSTALLATION (GENERAL)

VOLUME III CIVIL WORKS

SEC.NO.

SPECIFICATION NO. REV.NO.

TITLE

C TCE.6349A-H-203-401

C1 CIVIL

1.1 P0 Specific RequirementsCivil Works

1.2 P0 DatasheetCivil Works

1.3 P0 DatasheetGeotechnical Investigation

1.4 P0 DatasheetTopographic Survey

D TCE.6349A-H-203-401 CIVIL SPECIFICATIONS2.1 P0 Specifications For Excavation In Hard Rock

2.2 P0 Specifications For Earthwork In Grading,Excavation And Backfilling

2.3 P0 Specifications For Timber Shoring

2.4 P0 Specifications For Dewatering

2.5 P0 Specifications For Rain Water Drainage

2.6 P0 Specifications For Site Filling

2.7 P0 Specifications For Line Drilling And Pre-shearing

2.8 P0 Specifications For Admixtures For Concrete

2.9 P0 Specifications For Concrete And Allied Works

2.10 P0 Specifications For Fabrication Of StructuralSteel

2.11 P0 Specifications For Erection Of StructuralSteel

2.12 P0 Specifications For Painting Of Structural Steel

2.13 P0 Specifications For General Building Works

2.14 P0 Specifications For Precoated Sheets, SideSheeting And Accessories

2.15 P0 Specifications For Water Supply, SanitaryAnd Drainage Work

2.16 P0 Specifications For Grouting2.17 P0 Specifications For Galvanising of Structural

Steel


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ISSUE

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2.18 P0 Specification For Internal Road Works

2.19 P0 Specification for Anti termite preconstructional treatment.

TENDER DRAWINGS

1TCE-6349A-203- AC -6002

P0 Control building Basement plan

2TCE-6349A-203- AC -6003

P0 Control building Ground Floor plan

3TCE-6349A-203-AC-6004

P0 Control building Terrace Floor plan

4TCE-6349A-203-AC-6005

P0 Control building Sections

5TCE-6349A-203-AC-6006

P0 Control building Elevations

VOLUME IV MECHANICAL SYSTEMS/EQUIPMENTS

SEC.NO.

SPECIFICATION NO.REV.NO.

TITLE

C TCE.6349A-H-203-401 P0 Fire Fighting System

C TCE.6349A-H-203-401 P0 HVAC

F TCE.6349A-H-203-401 R0 Schedule of General Particulars

F TCE-M4-991 R7 Schedule of Deviation from TechnicalSpecification

F TCE-M4-985 R1 Schedule of Personnel for Supervision of

Erection, Commissioning, Start Up andPerformance Testing.

ENGINEERING DRAWINGS

C TCE.6349A-617-FD-1001

P0 Fire Fighting System Flow Diagram

C TCE.6349A-617-GA-1002

P0 Fire Fighting System Pipe Routing Drawing

C TCE.6349A-617-GA-

1003

P0 Fire Fighting System Fire Water Tank And

Plant Room GA

C TCE-6349A-811-GA-1004

P0 HVAC SystemGround Floor


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TATA CONSULTING ENGINEERS LIMITED

TCE-6349A-H-203-401SECTION C

ISSUEP0

SPECIFIC REQUIREMENTS

CIVIL WORKS


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SPEC.NO. TATA CONSULTING ENGINEERS LIMITED SECTION: C

TCE-6349A-H-203-401 SPECIFIC REQUIREMENT

CIVIL WORK

SUBSECTION : 1.1SHEET 1 OF 42

ISSUEP0

1. GENERAL

THE TATA POWER COMPANY LIMITED, MUMBAI. (Hereafter called asTATA POWER) has proposed to construct 110 /33 kV Sub Station in M/sIxora premises in Panvel in Raigad district of Maharashtra, India, consideringthe upcoming load in the Ixora Township and other areas and to ensurereliability of supply.a. Construction of all Civil and structural steel structures including 110kV

outdoor equipment & Tower foundation, 33kV GIS and control building,Transformer Foundations, Soak pit, Pump house, Burnt oil tank, ParkingFacility, Roads, Drain & Cross drainage etc.

b. Site grading, approach road works and roads within the substation,pathways, etc.

c. Gantries/structures for electrical plant items/equipments. EquipmentFoundations for electrical and other plant items including allmiscellaneous works.

d. Trenches arrangement for laying of Power and Control Cablese. Provision of safety signage as per requirement.

2. SCOPE OF WORKS

The scope of work consists of collection of all site related data like presenceof roads, access to site, water logging areas if any, preparation of generalarrangement drawing, detailed construction/fabrication drawings, supply of alllabour, materials, construction, fabrication, erection and testing where

necessary, of all Civil structures and Civil works for all services andbuildings/room required for successful commissioning of Project mentionedunder para 1. The Civil works shall also include shifting or rerouting ofExisting roads and drains etc. The Civil works shall include but not limited tofollowing facilities/structures/systems required for Installation, testing,Successful Commissioning of Project.

2.1.1 Site development works like land development, fencing etc.

2.1.2 Construction enabling works like temporary roads, temporary equipmentfoundations, temporary rerouting or shifting of utilities, fabrication yard, Portacabins etc.

2.1.3 Civil works consisting ofa. Shifting /Rerouting /Closing Existing utilities or connection with Existing

utilities

b. Switchyard equipment structures, gantry structures, lightning masts, etc.as necessary, along with their foundations

c. Construction of Proposed Control/33kV GIS building shall consist of (Asper Tender drawing) :-

33kV GIS Panels, Battery Room, AC/DC room, Control Room,SCADA and Communication room, STX, Store room, Lab/test room,Office room etc on Ground floor

Cable Basement


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Staircases

Unloading platform, approach road etc.

Toilet blocks etc with necessary plumbing & fittings

2.1.4 Structures like Transformer Foundations with Fire Barrier walls, CableTunnels and Trenches, Pump house with monorail, parking, DG set, Day tanketc.

2.1.5 Road, drain and cross drainage works within the Project area.

2.1.6 Water supply, storm water disposal and Sewerage system for proposed area.

2.1.7 All necessary infrastructure Civil works in addition to above required forsuccessful commissioning electromechanical systems, Instrumentation

works.

2.1.8 In addition to this CONTRACTOR shall assume whatever is necessary andrequired for successful completion and commissioning of the project.

2.2 The work to be performed under this specification consists of design,engineering as well as providing all labour, materials, consumables,equipment, temporary works, transportation and all incidental items notshown or specified but reasonably implied or necessary for the completionand proper functioning of the Project, all in strict accordance with thecodes/specifications.

2.3 All materials including cement, reinforcement steel, structural steel etc. shall

be provided by the CONTRACTOR. The OWNER will not supply any of thematerials required for construction, fabrication, erection and completeexecution of work

2.4 The work shall be carried out according to the design / drawings to bedeveloped by the CONTRACTOR and approved by the OWNERsrepresentative. For civil works of Sub Station, control/33kV GIS building,Pump house, Transformer Foundations, Cable Tunnel, roads, storm waterdrains etc., necessary layouts, detailed submission drawings, are to bedeveloped by the CONTRACTOR (based on the basic layout drawingsappended with this tender document,) keeping in view the statutory &functional requirements and providing enough space & access for operation,

use & maintenance. Certain minimum requirements are indicated in thisspecification for guidance purpose only. However, the CONTRACTORsoffer shall cover the complete requirements as per the best prevailingpractices and to the complete satisfaction of the OWNER. CONTRACTORshall also prepare detailed working drawings (Architectural, General Civil andstructural) and record purpose As-Built drawings.

2.5 CONTRACTOR shall inspect the site, examine and obtain all informationrequired and satisfy himself regarding matters and things such as access tosite, communications, transport, right of way, type and number of equipmentand facilities required for the work, availability of local labour, materials andtheir rates, local working conditions, weather, flood levels in case of sitelocated on sea shore or near the rivers, natural drainage, existing drainsaround the proposed site etc. Ignorance of the site conditions shall not be


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accepted by the Owner as basis for any claim for compensation or extension

of time. The submission of a bid by the CONTRACTOR will be construed asevidence that such an examination was made and any later claims / disputesin this regard to rates / lump sum quoted and time extension shall not beentertained or considered by the OWNER.

2.6 It is not the intent to specify herein all the works in the scope of this contract.The scope which is not specifically mentioned here but required forconstruction and successful commissioning of system is deemed to beincluded in the scope of the CONTRACTOR. All works shall conform to thespecifications. The works shall conform to high standards of design,engineering and workmanship. Design and construction shall conform inevery respect to all local and state regulations governing such works and tostipulations of Indian Standards unless stipulated otherwise in detailspecification.

2.7 Geotechnical Investigation

Geotechnical investigation report shall be collected from the owners office.In case the CONTRACTOR wishes to carry out his own soil investigation, hemay approach the OWNER for necessary permissions. The OWNER acceptsno responsibility, whatsoever for inferences drawn from this data and theCONTRACTOR is deemed to have satisfied on his own responsibility as tothe extent to which this information represents the conditions to beencountered. If the CONTRACTOR as per his soil investigation finds thevalues different than those given in soil report available with OWNER, then

the conservative values shall be adopted in the final design. For tenderpurpose BIDDER may carry out geotechnical investigations to ascertainhimself about geological conditions.

2.8 Survey data

Contour survey of the plot shall be collected from the owners office. TheOWNER accepts no responsibility, whatsoever for inferences drawn from thisdata and the CONTRACTOR is deemed to have satisfied on his ownresponsibility as to the extent to which this information represents theconditions to be encountered. For tender purpose, BIDDER may carry out thenecessary survey of the plot, elevations, crossings etc.

2.9 The Overall elevation treatment to Control/33kV GIS building shall be as perthe data sheets and tender drawings attached herewith. The colourcombinations for elevations shall be as approved by Tata Power.

2.10 Statutory requirement

CONTRACTOR shall comply applicable statutory requirements and obtainapprovals/permissions pertaining to Project, Fire safety rule, Explosives act,Statutory clearances, norms of State Pollution Control Board, disposal ofdebris in authority approved area, Collectors permission, Traffic permission,Garden permission, Debris management cell, provisions of Safety, healthand welfare according to Government act etc required for successfulcompletion and commissioning of the project. CONTRACTOR shall obtain

occupation certificate from concern authorities. The royalty payment forCollectors permission for excavation and backfilling, for disposal of debris in


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approved land and for any other permission required for successful

completion and commissioning of the project shall be borne by theCONTRACTOR. CONTRACTOR shall prepare necessary submissiondrawings and obtain approval from concerned authorities before taking up theconstruction work. In addition to above, any approval/permission required forsuccessful commissioning of project shall be the responsibility and shall beobtained by the CONTRACTOR.

The statutory payment against demand notes for statutory approvals will be

reimbursed by OWNER on production of receipts by CONTRACTOR.However, liasioning, coordination, follow-up with statutory authorities andexpenses for the same shall be borne by CONTRACTOR. Necessarydocuments shall be provided by OWNER.

2.11 Design engineering

Complete detailed design calculations of all structures, works together withgeneral arrangement drawings, working architectural, structural drawings,fabrication/shop drawings, as built drawings and explanatory sketches shallbe submitted to the OWNER/OWNERs representative for approval. Separatecalculations for foundations or superstructures submitted independent ofeach other shall be deemed to be incomplete and will not be accepted by theOWNERs representative. Contractor shall submit Design calculations ineditable soft and hard format.

3. IS CODES & REFERENCES3.1 All the Indian Standards referred to shall be the latest revision (including all

amendments issued thereto) at the time of offer made by theCONTRACTOR.

3.2 Reference to only some of the codes in this document and various clauses ofdesign criteria shall not limit or restrict the scope or applicability of otherrelevant codes. It shall be ensured that all other codes relevant to a specificjob, in addition to those already mentioned, are followed wherever applicable.

3.3 In case of any deviation / conflict between provisions of IS codes and thedesign criteria, the provisions that are more stringent shall be followed unlessspecifically directed otherwise.

3.4 The Codes and Standards listed below are applicable for the design andconstruction of structures and buildings in general. Codes and Standardsapplicable for specific design and construction are listed elsewhere inreference sections.

3.5 Field and laboratory testing procedures for materials should follow IndianStandard Specifications.

3.6 All designs shall be based on the latest International orIndian Standard (I.S.)Specifications or Codes of Practice. The design standards adopted shallfollow the best modern engineering practice in the field based on any otherinternational standard or specialist literature subject to such standard


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reference or extract of such literature in the English language being supplied

to and approved by the OWNER/OWNERs representative.3.7 The Codes and Standards listed below are applicable for the design and

construction of structures and buildings in general. Codes and Standardsapplicable for specific design and construction are listed elsewhere in furthersections. :

LOADS

IS:875 Code of Practice for design loads (other than earthquake) forBuildings and structure (All parts).

IS:1911 Schedule of unit weights of building materials IS:1893 Criteriafor earthquake resistant design of structure.

IS 1893 Criteria for Earthquake resistant design of structures

FOUNDATIONS

IS:1080 Code of Practice for design and construction of shallowfoundations on soils ( other than raft, ring and shell )

IS:1904 Code of Practice for design and construction of foundations insoils general requirement

IS:8009 Code of Practice for calculation of settlement offoundations: ( All parts )

IS: 2911 Code of practise for design & construction of pile foundations(All parts)

RCC

IS:456 Code of Practice for plain and reinforced concrete

IS:4326 Code of Practice for earthquake resistant design andconstruction of buildings

IS :9103 Concrete Admixtures Specification

IS 2502 Code of Practice for Bending and Fixing of Bars for ConcreteReinforcement

IS:5525 Recommendation for detailing of reinforced concrete works

IS:1786 Specification for high strength deformed steel bars and wiresfor concrete reinforcement

IS:10262 Recommended guidelines for concrete mix design

IS:11384 Code of Practice for composite construction in structural steeland concrete

IS : 13920 Ductile detailing of reinforced concrete structures subjected toseismic forces - Code of practice


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STRUCTURAL STEEL

IS:800 Code of Practice for general construction in steel

IS:806 Code of Practice for use of steel tubes in general buildingconstruction

IS:808 Dimensions for hot rolled steel beam, column channel andangle section

IS:813 Scheme of symbols for welding

IS:816 Code of Practice for use of metal arc welding for generalconstruction in mild steel

IS:7215 Tolerances for fabrication of steel structures

IS:9595 Recommendation for Metal arc welding of carbon andcarbon manganese steel

IS:12843 Tolerances for erection of steel structures.

MISCELLANEOUS

IRC 19 Standard specification and code of practice for Water BoundMacadam.

IRC 6 For Vehicular loads above Cable Tunnel.

IS 2720 Methods of test for soils Part IV & VIS 2386 Methods of Test for Aggregates for Concrete Part I: ParticlePart I Size and Shape.

SP-7 National Building Code of India

SP-16 Design Aids for reinforced concrete to IS:456

SP-22 Explanatory handbook on codes for earthquake engineering (IS:1982-1975 and IS:4326-1976 )

SP-24 Explanatory handbook on Indian Standard code of Practicefor plain and reinforced concrete

SP-25 Handbook on causes and prevention of cracks in buildingsSP-34 Handbook of concrete reinforcement and detailing (SCIP)

IS 802 Use of structured steel in overhead transmission line tower codeof practice Parts I, II & III

The design considerations described hereunder establish the minimum basicrequirements of plain and reinforced concrete structures, masonry structures,structural steel works, Roads, etc However, any particular structure shall bedesigned for the satisfactory performance of the functions for which the sameis being constructed. The Contractor shall also take care to check the stabilityof partly completed structures.


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4. DESCRIPTION OF STRUCTURES AND FACILITIES

Following structures / areas / facilities are to be included in the contract. Thedescription and requirements given for structures / system is indicative onlyand not exhaustive. Although almost all the systems are covered here butany other system (Civil and Structural) required for successful commissioningof the project shall form a part of this contract and shall deemed to beincluded in the scope of works.

4.1 Site surveying

Total Station shall be used at site for establishing the exact coordinates andalignment of structures. The instrument used shall be calibrated andcalibration certificate shall be submitted to OWNER/OWNERsrepresentative.

4.2 Site grading

The required grading for the area shall be done by CONTRACTORconsidering finished ground level (FGL) of the plot. The FGL of the plot shallbe 500mm above High flood level. CONTRACTOR shall obtain highest floodlevel from concern authorities. In case of land development, the excavatedmaterial in the plot approved for filling by OWNERS representative shall beused else Cohesive non swelling soil shall be provided by CONTRACTORand supply, filling, compaction as per specification etc shall be included inCONTARCTORS scope. The surplus excavation material shall be disposedoff by CONTARTOR after taking permission/approval from DEBRIS

MANAGEMENT CELL.4.3 Compound wall & Gates

4.3.1 The compound wall shall be provided all along the periphery of the entire plot.The compound wall shall consist of RCC floating columns at suitable intervalalong the wall. The foundation of column shall rest on suitable foundingstrata. Grade of concrete shall be M30. The compound wall specification shallbe as per Item 49 of Data Sheet. The compound wall elevation shall beapproved by the OWNER.

4.3.2 The gate for compound wall shall be 6m wide (2 leaf each of 3m), 1.8m inheight and shall have an external framework of GI pipes and internalframework of MS flats. Gates shall be formed out of tubular sectionconforming to IS: 1161. The gate elevation shall be approved by theOWNER. The gate shall have all necessary hinges, locking arrangementstoppers and painting complete, as approved by the OWNER.

4.4 Construction Enabling Works

4.4.1 Construction water and Construction Power Supply

The water and power required for construction upto successfulcommissioning of the project shall be arranged by CONTARCTOR and costfor the same shall be borne by CONTRACTOR.


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4.4.2 Temporary site Works

The CONTRACTOR shall provide for at his cost the following buildingfacilities for proper execution and quality control of the job, while meeting theprovision stipulated by Government Rules regarding staff welfare facilities.

4.4.3 Temporary Stores

4.4.3.1 A covered store shall be provided with brick cladding and A.C/G.I/colourcoated sheeting to store at least 15 days requirement of cement. Cement inbags shall be stored on a raised floor well away from outer walls andinsulated from the floor to avoid moisture. Not more than 15 bags shall bestacked in any tier. Each consignment of cement shall be stored separatelyand consumed in its order of receipt. Storage of cement shall be as per IScode no 4082.

4.4.3.2 Covered storage area may also be provided to store other constructionmaterial which will be affected on exposure to wind, sun and rain.

4.4.3.3 Reinforcement, structural steel members shall be stacked on top of timbersleepers to avoid contact with ground / water.

4.4.3.4 Storage yard paved or unpaved shall be provided within the stores complexfor storage of other material.

4.4.3.5 Security arrangement shall be provided for the stores complex.

4.4.3.6 CONTRACTOR shall make his own arrangement for storage of material.

4.4.4 Fabrication yardDepending on the extent of fabrication envisaged at site and plot areaavailability, the CONTRACTOR shall establish a full fledged structuralfabrication yard with adequate handling facility during and after thefabrication.

4.4.5 Temporary Equipment Foundations

Depending on the requirement, it may be necessary to construct temporaryFoundations and dismantle them after temporary use.

4.4.6 Shifting of Services / Utilities

The existing services / utilities (Cable, water supply, sewerage system etc.)

may need to be shift / relocate / reroute as per the requirement of project.Contractor shall prepare new layout for the same as per the requirement ofthe site conditions & submit to owner for approval.

4.5 Staff Welfare facility

4.5.1 CONTRACTOR shall provide adequate facility for his staff inside the plantboundary such as toilets for gents and ladies, drinking water facility, restplaces etc.

4.5.2 Necessary approach roads to the construction facility complex and internalroads within the complex as well as proper drainage of the area shall be theCONTRACTORs responsibility. He shall also provide for proper disposal of

sewage and other wastewater to meet with the requirement of PollutionBoard.


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4.5.3 No labour camp will be allowed in plot boundary. Only Porta cabins for site

office will be allowed.4.6 Dismantling & Demolition work

a) Rerouting of existing road, drains and cable trenches

4.6.1 All the salvaged material generated due to the Demolition / Dismantlingactivity shall be stored/ stacked at the place directed by the Ownersrepresentative. Contractor shall prepare list of the salvaged material & shallhanded over to Owner. Contractor shall dispose of the Dismantled material tothe Dumping Ground with all Leads & Lifts as directed by OwnersRepresentative. While demolition / execution Activity considerable amount ofshifting, re-shifting, temporary shifting of some material / utilities / equipmentswithin the premises are likely to be involved. While executing Dismantling /

Demolition activities Contractor shall ensure that all safety precautions areinvariably taken into consideration to safeguard against accidents and injuriesto his workmen and third party personnel. Contractor shall provide goodquality protective apparel and safety equipment to all his workmen & Staff.Contractor shall also make provision of safety apparel & equipment forOwners personnel if they wish to visit the site during execution of aboveactivities. Contractor shall follow Tata Powers safety precautions attachedwith tender while executing above activities.

4.7 Control / 33kV GIS BUILDING

4.7.1 The building shall be framed structure with Basement + Ground, as per thetender drawings attached.

4.7.2 The clear sizes and heights of various rooms, utilities on each floor of thebuilding shall be as specified in attached Tender drawings. No deviation indimensions and height is allowed.

4.7.3 The building structure shall be of RCC frame structure. HoweverCONTRACTOR may consider option of combination of RCC and structuralsteel and pre stressed structural members, subjected to completion &commissioning of various stages of the project within timeframe specified intender document. For RCC all the column footings shall be of isolated footingtype. Grade of Concrete shall be M30 except otherwise specified. Forstructural steel, 2 hour fire rated protection as per ASTM 119 cementiousvermiculite free, water base structural steel compound shall be applied overpre-primed surface already coated with two coats of Epoxy primer atFabrication site.

4.8 Basement

4.8.1 The peripheral wall and raft of basement shall be designed as RCC retainingwall in concrete grade M30.

4.8.2 The basement walls and entire structure shall be designed for followingconditions-

The walls and base slabs shall be designed for saturated earth/waterpressure corresponding to high flood level or finished plot level whichever is

higher.


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Basement shall be designed for uplift in empty conditions with the water

table indicated in the geotechnical report or high flood level, whichever ismaximum.

The dead weight of the empty structure shall provide a safety factor of notless than 1.2 against uplift pressures during construction and in service.

Walls shall be designed under operating conditions to resist earthquakeforces from earth pressure mobilisation and dynamic liquid loads. Also shallbe checked for vehicular surcharge for walls in vicinity of roads.

4.8.3 Structure shall also be checked against stresses developed due to anycombination of full and empty compartments with appropriate ground/upliftpressures from below to base slab.

4.8.4 Water proofing treatment to raft and walls as specified in Data sheet item no1 shall be carried out to ensure water tightness. CONTRACTOR shall giveperformance guarantee of water tightness for a period of at least 10 years.The finish to walls of concrete shall be F1 type as per specification ofconcrete works attached. CONTRACTOR shall assure that there will not beany waviness on internal surface of walls or else he should make the surfacegood by plastering as per item no 5. RCC walls shall be provided with internalpaint as per Data sheet item no 7.

4.8.5 The basement shall be provided with heavy duty ironite flooring as per Datasheet item no 2.

4.8.6 To channelize the cables in basement, 230mm thick brickwork channels of1m height of appropriate size shall be provided on basement floor whereverrequired. The plastering, painting shall be as per Data Sheet item nos 5, 7respectively.

4.9 Ground floor

4.9.1 Any wall between floor area and transformer shall be brick masonry (Datasheet item no 3) fire rated wall (minimum 350mm thick). The wall shall nothave any openings. It shall be plastered and painted as per Data sheet itemno 4, 5, 6, and 7.

4.9.2 The flooring shall be :

33kV GIS, AC/DC room Flooring/skirting shall be of vitrified tiles asper Data sheet item no 10.

Battery room shall be provided with acid resistant flooring as per Datasheet item no 14.

Eye wash arrangement shall be provided in the battery room.

4.9.3 False ceiling shall be provided and shall be as per Data sheet item no 15.

4.9.4 Floor slab shall be provided with required number of ducts/openings/cut-outsfor successful commissioning.

4.9.5 Approach to Ground floor from road with railing shall be provided.

4.9.6 Motorised MS Rolling shutter of size as per the drawings shall be provided bythe contractor


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4.10 Terrace floor

Waterproofing to terrace shall be as per Data sheet item no 17

One meter high parapet wall in fly ash brick masonry 230mm thickwith internal(Item no 5) and external plastering(Item no 4) andexternal painting as per item no 6 internal painting as per Item no 7shall be provided along the periphery.

4.11 Steel Structure support for 110kV Substation

4.11.1 Analysis and Design of Structures

4.11.1.1 Loads

a) Wind pressure

i) On gantry and auxiliary equipmentsupporting structures 195 kg/m

2

ii) On bus bars, conductors, shield wires 146 kg/m2

iii) On insulator strings 146 kg/m2

iv) On equipmenta) for flat surfaces 195 kg/m

2

b) for circular surfaces 122 kg/m2

In case of gantry and auxiliary equipment supporting structures, the wind

pressure shall be calculated on 1.5 times the projected area of the memberson windward face.

In the case of bus bars, conductors and shield wires, the pressure shall beassumed as acting on the full projected area.

For the purpose of computing the wind pressure on insulator strings, theeffective projected area of the string shall be assumed as 50 percent of theprojected area of the cylinder with a diameter equal to that of the insulatorskirt and length based on the number of discs in the insulator string .

For all other equipment the wind pressure shall be assumed as acting on the

full projected area of the equipment.b) Vertical load due to weight of a lineman with tools for all members

having an angle less than 15 with the horizontal: -

150 kg acting at center of the beam

c) Load due to incoming line and ground wire: -

Load due to the conductor shall be wind load, dead weight andconductor tension. The line terminating structure shall be designedfor tension for conductor and ground wire of 800 kg and 500 kg

respectively and angle of deviation of conductors shall be 30 both

horizontally and vertically. For the purpose of design, the line


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termination structure is situated at 100m from incoming terminal

tower.d) Short circuit force: these shall be calculated based on a short circuit

current of 40 ka for 110 kV structures.e) Self-weight of equipment and accessories shall be as given by

manufacturer.

4.11.1.2 Combination of Loads

For the design of the structures, simultaneous application of loads asindicated in below Clauses shall be considered. The direction of wind shouldbe assumed such as to produce the maximum stress in any member for thecombination of wind load and wire tensions. For this, conditions of windacting perpendicular and parallel to bus conductor and shield wire shall beconsidered separately.

4.11.1.3 Normal Condition

a) For strung bus bars

-Wind load on bus bars, shield wires, insulator strings, electricalequipment, structure members, etc.

-Unbalanced loads due to wire tension.

-Dead loads of wires, insulators, electrical equipment and structuralmembers.

b) For rigid bus bars

-Wind load on bus bars, electrical equipment, structure members,etc.

-Dead loads on bus bars, post insulators, electrical equipment andstructural members.

4.11.1.4 Abnormal Condition

Short Circuit Conditions

In addition to the combination of loading, short circuit forces shall beconsidered for the design of structural members.

4.11.1.5 Load Factors

The ultimate loads shall be calculated by multiplying the loads obtainedabove by load factors as given here. Load factors shall be taken as 2.0 undernormal conditions and 1.5 under abnormal conditions.


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4.11.1.6 Allowable Stresses

The yield strength of the steel used shall be taken as the minimumguaranteed value as per relevant BIS Code for mild steel sections. For boltsand nuts, the permissible value of shear, bearing and tensile stresses shallbe assumed as per IS 802 (Part I/ Sec 2). Structural steel members havingboth axial and bending stresses shall be designed as per the provisions ofIS:800.

a) Axial Stress in Tension

The estimated tensile stress on net effective sectional area as per IS:802(Part I/ Sec 2) in various members based on ultimate load shall not exceed

the minimum guaranteed yield stress of steel.

b) Axial Stress in Compression

The estimated compressive stress in various members based on ultimateload shall not exceed the value given by the formula specified in clause 5.2 ofIS:802 (Part I/ Sec 2).

4.11.1.7 Erection Stress

Where erection stress combined with other permissible co-existent stressescould produce a stress in any member appreciably above the allowable stresssuch additional material shall be added to the member or such otherprovision made as is necessary to bring the stress within the specified limit.

4.11.2 Material

4.11.2.1 Steel

The support structure members shall be fabricated using structural steelconforming to IS:2062 Grade A.

4.11.2.2 Zinc

Zinc used for galvanizing shall be of 99.95% purity.

4.11.2.3 Bolts, Nuts and Washers

All hexagonal head bolts, mating hexagon nuts and plain washers shallsatisfy the requirement specified in IS:12427 including their hot dipgalvanizing. Galvanizing and Testing of bolts and nuts shall be done inaccordance with IS:1367.

4.11.2.4 Sectional Properties of Structural Members of Supports

Structural steel angle sections manufactured according to the latest IS:808will be used for fabrication of support members.


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4.11.2.5 Designing and Detailing of Support structure Members

The Contractor shall be required to keep in consideration the following points,while designing the structures:

a) All the members shall be designed out of structural mild steel sectionsor gusset plates having their sizes and properties as per relevantBureau of Indian Standard Specification bolted together by means ofbolts and nuts only.

Use of mild steel rounds will be permissible only for making thehangers or U-Bolts or extension links for supporting the insulatorstrings and earthwire clamps at the support structure for whichwelding may be permitted, if considered necessary.

b) All parts shall be made accurately to standard gauges so as tofacilitate replacement and repairs. All corresponding parts of similarsupport structures shall be interchangeable.

c) Members shall be connected directly to each other without use ofgusset plates, wherever practicable.

d) All the connections shall be detailed to minimize eccentricity of theconnections.

e) Notching shall not be normally permitted, but if unavoidable, the cut ofoutstanding flanges to the extent of sheared edge distance can be

provided. Chamfering of the flange upto 45 may be done. In casewhere clearances are critical, the minimum sheared edge distancefrom bolt-hole centres shall be retained.

f) At all places where there is gap between two connected members,mild steel packing washers or wrought iron tapered washers shall beprovided, wherever possible. The size of washer shall be determinedas follows :

i) Thickness Equal to gap

ii) Length and breadth As per edge securityconsiderations for sheared edge.

g) The gap between the ends of two connected members in a butt jointshall not be more than 6 mm and not less than 4 mm.

h) No individual members in any type of support structures, extensions,templates and special structures shall be longer than 6 metres.

i) For member design, relevant provisions of IS:802 (Part 1/ Sec. 2)regarding permissible stresses, slenderness ratios, minimumthickness, net sectional/effective areas for members in tension,

bolting, and framing shall be followed.


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4.11.3 Fasteners and Joints

4.11.3.1 Provisions of Clause 5 of IS:802 (Part II) shall be followed, unless noted.

4.11.3.2 While dimensioning the gauge lines, allowances should be kept for mill rollingtolerance on negative side to the extent of 2.5 percent of flange width.

4.11.3.3 The distance from the center of a bolt hole to the face of the over hangingflange of an angle or other members would be adequate for convenientlytightening the bolts by socket wrench or box spanners.

4.11.3.4 All measurements should be done from the outer heel edge.

4.11.3.5 Bolt at the joint shall be so staggered that nuts may be tightened withspanners without fouling.

4.11.3.6 Hot dip galvanized plain washers of 5-mm nominal thickness shall beprovided for insertion under all nuts. The length of bolts shall be determinedconsidering this.

Any reinforcement of unbraced stubs by providing cleats etc. shall not bepermitted.

4.11.3.7 Stub-setting Template

Anchor bolt and base plate arrangement shall not be allowed for connectingthe steel structure to the concrete foundation. Instead, the Contractor shalldevelop suitable designs to connect the super structures with their respectivefoundations by means of stubs left in the foundations for that purpose.

For correct setting of gantry stubs and for equipment stubs where possible,stub templates shall be designed, fabricated and supplied by the Contractor.Alternately, bottom part of the structure shall be assembled and aligned atfinal location before concreting.

The slenderness ratio of any member in template shall not exceed 250.

4.11.3.8 Step-bolts, Nuts and Washers

Each Gantry structure shall be provided with step-bolts of an approved type16-mm dia. and 175-mm long on one corner leg at not more than 380-mm

center starting 0.5m above the Finished Ground Level and continuing to theearthwire.

Step bolts, nuts and washers shall conform to requirements of IS:10238,including their hot-dip galvanizing.

4.11.4 Materials and Workmanship

Unless otherwise specified, all material shall be of out-door type, of the bestquality and workmanship capable of satisfactory operation under theoperating and atmospheric conditions specified. Unless otherwise specifiedherein, the materials shall conform, in all respect, to the requirement of the

latest edition of the relevant Bureau of Indian Standard specifications on that


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behalf. Wherever Bureau of Indian Standard specifications have not been

formulated IEC shall apply.

Contractor may offer materials manufactured in accordance with other wellrecognized standards, but shall in that case supply a copy of the standardspecifications adopted by them and shall clearly mention in what respectsuch standard specification differ from corresponding Bureau of IndianStandard Specifications.

However, material quality and strength should in no case go below thestipulations and requirements of IS.

All materials shall be erected after being approved and passed by the

Engineer/Owner.

4.11.5 Fabrication and Workmanship

The support structure members shall be fabricated in accordance with IS:802(Part-II). The following important points relevant to fabrication work aredescribed. The Owner reserves the right at all times to inspect the fabricationof support structure parts at the Contractor or Sub-Contractor's works.

a) All parts of support structures shall be fabricated in accordance withthe shop drawings prepared from approved detailed assemblydrawing.

b) Structures shall have bolted connection. Welding shall not be

permitted at any point unless otherwise previously approved by theOwner.

c) The structure members shall be accurately fabricated so that thesecould be bolted together easily at site without undue strain on thebolts or members.

d) No angle members shall have the two-leg flange brought together byclosing the angle.

e) Structures shall be so designed that all parts shall be accessible forinspection and cleaning pockets or depressions, which would holdwater, shall have drain holes. It will be ensured that the stressedmembers will not have any blank hole after final assembly, except forholes on account of step bolts or planned holes in stubs.

f) Fabrication shall be carried out in conformity with the latest practiceemployed in the manufacture of transmission line support structuresby using power driven cropping, punching, shearing and drillingmachines. Relevant Bureau of Indian Standards shall govern theextent of various operations and the standard practices followed forsuch operations.

g) No rough edge shall be permitted anywhere in the entire structure.The flanges of the angle sections at the ends of members shall beproperly chamfered, if there are even slight chances of its fouling withother members or if they cause difficulty in proper tightening of thebolts. All clippings, back cuts, grindings, bends, holes etc. shall be

true to detailed drawings and free from burrs.


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h) No welding, filling or plugging shall be permitted unless previously

approved. Welding of two or more pieces to obtain length of membersspecified will not be permitted.i) All sections, plates and bars shall be straightened before any work is

done on them free from twists, carefully levelled and made true todetailed drawings by methods, which will not injure the materials sothat when assembled the adjacent surfaces are in close contactthroughout. Hammering shall not be permitted for straightening orflattening of members.

j) Cutting of members shall be carried by shearing, cropping, flamecutting or sawing. Members over 10-mm thickness shall be sawn orflame cut, followed by grinding. The surface so cut shall be clean,smooth, reasonably square and free from any distortion.

k) Holes in the members shall be either punched or drilled with the helpof jigs and fixtures. Drilled holes will be preferred. However, membersupto 12-mm thickness may be punched and members over 12-mmthickness shall be drilled. All burrs left after drilling or punching shouldbe removed completely. Holes adjacent to the bend shall be drilled orpunched after bending.

l) Holes for bolts shall be circular. Oval or lobbed forms of holes shallnot be permitted. The diameter of hole shall be 1.5 mm more than thediameter of bolts.

m) The holes shall be perpendicular to the plates or angles.n) The accuracy of location of holes shall be such that for any group,

when assembled, it shall admit the bolt at right angles to the plane ofconnection.

o) Members shall be bent hot, but in case of small bends; cold bendingmay be done with the prior approval of the Engineer, provided nofracture of material occurs. All the bending operations shall be doneby pressure. No bending of members shall be done for slope above

45 .p) When members are spliced by a lap joint, heel of inside angle shall be

rounded to the minimum possible radius consistent with proper fit withthe fillet of the outside angle. The thickness of the ground heel shallnot be less than that of the leg. Flat heeling will not be allowed.

4.11.6 Tolerances

The following fabrication tolerances shall be allowed as per IS: 7215.

i) The maximum allowable difference in diameter of the holes on the twosides of plate or angle shall not exceed 0.8 mm i.e. allowable taper inpunched hole shall not exceed 0.8 mm on diameter.

ii) The tolerance cumulative and between consecutive holes shall be

within 0.5 mm.

iii) The tolerance on the overall length of members shall be within 1.6

mm.


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iv) The tolerance on back mark shall be within 0.5 mm.

4.11.7 Marking

All parts covered under supply of the structures shall have distinct marks, asgiven in the detailed assembly drawing and Bill of Material, made with a steelpunch and sufficiently indented with letters and figures not less than 12 mm x18 mm in sizes so that these are clearly visible after galvanizing. The lettersshall indicate the type of structure in which the member is to be used andnumeral shall indicate the member mark as per drawing and bill of material.These erection marks shall be stamped near one end and in the samerelative position on each piece, in such a way that the mechanical propertiesof members are not affected. Special care must be taken to stamp the correcterection mark. The Contractor shall be entirely responsible for any disruptionof work, delay in completion of line, delay in payment of bill on account ofwrong erection marks.

4.11.8 Packing

Light angle sections shall be wire bundled and heavy angle sections may besent loose.

Cleat angles, plates, hangers, U-bolts, pack washers and similar loose piecesshall be nested and bolted together in multiples or securely wired togetherthrough holes.

Bolts, nuts, washers and other attachment shall be packed in non-returnabledouble gunny bags and accurately tagged in accordance with contents. Thepacking shall be done in such a manner so as to avoid losses/damagesduring transit. Each bundle or package shall be appropriately marked. Noextra charges for packing shall be admissible, and packing charges shall beassumed to be included in the contract rates.

4.11.9 Inspection

The Owner or his representative shall have free access at all reasonabletimes to those parts of the Contractor's works which are concerned with thefabrication and galvanizing of the steel work and shall be provided all

reasonable facilities for satisfying himself that the fabrication, galvanizing andpacking is being done in accordance with the provisions of this specification.Unless specified otherwise, inspection shall be made at the place ofmanufacture, prior to despatch.

No member once rejected for lack of conformity to the specifications, shall bere-offered for inspection, except in cases where the Owner or his authorizedrepresentative considers the defect as rectifiable.

Defects, which may appear during fabrication, shall be made good with theconsent of and according to the procedure laid down by the Owner.

The Contractor shall supply all gauges and templates necessary forinspection of fabricated material.


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The Contractor shall use the correct grade and quality of steel and zinc. To

ascertain the quality of steel/zinc used, the Owner may at his discretion, getthe raw and fabricated material tested at an approved laboratory.

4.12 Foundations for 110kV Substation Structure

4.12.1 General

Reinforced Cement Concrete (RCC) type individual footings shall more bepreferred foundations for all equipment structures and gantries. Howeverwhere the same are found to be uneconomical, and if the Engineer permits,individual Plain Cement Concrete (PCC) footings may be provided. TheContractor shall submit the detailed designs and drawings for the foundationsof all equipment structures and gantries, for the approval of the Engineer.

The minimum grade of concrete for structural framework shall be M25.

The minimum clear cover to reinforcement shall be as per IS code

For equipment foundation, the permissible stresses shall be as per IS:456,latest edition.

4.12.2 Loads on Foundations

The foundations shall be designed to withstand the reactions at equipmentfoundation and gantry base along the stub angle slopes obtained from thestructural stress analysis. The reactions shall be transformed along threemutually perpendicular directions, one along stub angle slope and the othertwo being normal to the slope. The reactions shall be further increased by10% (i.e. multiplied by a factor of 1.10) as compared to the super-structurereactions.

The base reactions shall be composed of the following: -a) Maximum tension or upliftb) Maximum compression or down-thrustc) Maximum horizontal shear or side-thrust

4.12.3 Stability Analysis

The following primary types of soil resistances shall be assumed to act inresisting the loads imposed on the footings in earth:

a) Resistance against Uplift:

The uplift loads will be assumed to be resisted by the weight of earthin an inverted frustum of a conical pyramid of earth on the footing padwhose sides make an angle equal to the angle of repose of the earthwith the vertical. The weight of concrete embedded in earth and thatabove the ground will also be considered for resisting the uplift.

Every attempt shall be made to avoid over-lapping of frusta ofadjacent footings. In an unavoidable case, where the frusta of earthpyramids of two adjacent legs superimpose each other, the earthfrustum of each leg shall be assumed truncated by a vertical plane

passing through the center line of the tower base.


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b) Resistance against Down Thrust:

The down thrust loads will be resisted by bearing strength of the soilassumed to be acting on the total area of the bottom of the footings.

In the design of foundation for down-thrust, weight of concrete in thefooting above and below ground level and embedded steel parts shallcorrectly be accounted for, giving due consideration to water-table, ifpresent, and displaced earth.

c) Resistance against Side Thrust:

Side thrust shall be resisted by passive pressure acting on the side of

the chimney, and/or by at rest soil pressure acting against thefoundation slab and pyramid. In case this pressure is inadequate toresist the side thrust, help shall be taken of the friction of foundationagainst the ground; during down thrust condition only for this, the co-efficient of friction between the ground and the concrete surface shallbe taken as 0.2. This friction shall be deemed not to exist during upliftcondition. In case the passive pressure on the chimney face is lessthan the side thrust, effect of the moment at the base of foundation onthe base pressure shall be taken into account in the stability checkand subsequently in the design of the foundation. In all cases, thechimney shall be designed as a cantilever, fixed at the foundation top,subjected to the side-thrust, without any relief from the passivepressure.

d) Resistance against Overturning:

For resisting overturning, the weight of soil shall be assumed to be50% of the weight of the earth contained in the inverted frustum of thecone. The inverted frustum of the cone shall be the same as thatconsidered for resisting uplift as given above.

The following shall be considered during the stability analysis.

a. The increase in ground reaction caused by a moment due to

horizontal shear

b. The reduction of uplift capacity caused by a moment due tohorizontal shear.

4.12.4 Foundation Depth

The total depth of foundations below the original ground level (i.e. below thevirgin soil top level) shall not be less than 1.0 m. Foundations shall be takendown in the virgin soil in case of filled up areas during site grading.


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4.12.5 Design of Foundation

The strength design shall ensure safety against all stress resultants (viz.shear, bending and axial stresses) during each of the maximum down thrustand uplift conditions taken along with accompanying side thrusts. Particularly,the base slab shall be checked for stresses due to bending moment andshear force arising during down-thrust and uplift conditions, while thechimney portion shall be designed as a composite section for combinedaction of compression or tension force and associated bending moments dueto horizontal shears. The anchoring of stub and cleat shall be done to checkanchoring stress in down-thrust and uplift case.

The foundation shall be designed to satisfy all specified loading conditions.

The thickness of concrete in the chimney portion shall provide minimumcover of not less than 100mm from any part of the stub angle to the nearestouter surface of the concrete at all dry locations.

The chimney top or muffing must be at least 225 mm above ground level andalso the coping shall be extended upto the lower most joint level between thebottom lattices and the main corner leg of the tower. At least 50 mm thicklean concrete pad of 1:3:6 nominal mix of the size of base of the footing willbe provided below all foundations.

The minimum distance between the lowest edge of the stub angle and thebottom surface of concrete footing shall not be less than 100mm or morethan 150mm.

The foundation shall be so designed that the Center of Gravity (C.G.) ofsuperstructure leg coincides with the C.G. of chimney, and C.G. of chimneycoincides with the C.G. of base pyramid or slab whichever is provided. Incase this provision is not followed, the resultant eccentricities and additionalforces because of eccentricities shall be considered in the design offoundations.

The portion of the stub in the pyramid shall be designed to take full downthrust or uplift loads by the cleats combined with the bond between stubangle and concrete in pyramid portion.

4.12.6 Setting of stubs

The stub shall be set correctly in accordance with approved method at theexact location and alignment and in precisely correct levels. Stubs shall beset in the presence of the Engineers representative available at site for whichthe Contractor shall give adequate intimation to the Engineer.

The placing of the stubs shall be within the tolerances specified below

a) The difference in elevation between identical parts of any two stubsshall not exceed 1/1000 of the horizontal distance between the stubs,allowance being made for the difference, if any, in the lengths of legs.The actual elevation of any stub shall not differ from the prescribed

elevation by more than 6 mm of its correct position.


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b) The difference in horizontal spacing from specified distance between

identical parts of any two stubs shall not exceed 1/1000 of thehorizontal distance between the stubs.

The Engineers representatives shall approve setting of stub at each location.The approval shall not, however, absolve the Contractor of his responsibilityof correct setting of stubs and casting of foundations, who will be required torectify the faulty work at his own expenses.

4.13 Pump house:

4.13.1 The pump house shall be provided as shown in tender drawing.

4.13.2 Monorail of required capacity shall be provided in the pump house.

4.13.3 Pump house room shall accommodate pumps and accessories (like NRV,sluice /butterfly valve etc) along with electrical controls/equipment.CONTRACTOR shall submit the layout details for approval of OWNER.

4.13.4 The pump house structure shall be RCC framed structure. Minimum grade ofconcrete shall be M30.

4.13.5 The flooring shall be of Ironite flooring as per Data sheet item no 2.

4.13.6 The main entrance to the pump house shall have motorised M.S rollingshutter of size sufficient for bringing pump outside the pump house duringmaintenance. The specification shall be as per item no 51.

4.13.7 All necessary civil infrastructure works such as pedestals for pumps, insertscutouts etc required for successful completion and commissioning of pumphouse shall be in CONTRACTORS scope.

4.13.8 Structural steel staircase shall be provided from operating platform to pumphouse floor level. It shall consist of rolled steel sections, fixed with connectingplates or angles, M S Grating, chequered plates of diamond shape pattern forstaircase etc. Painting shall be as per Data sheet item no 9. CONTRACTORshall prepare detailed designs and drawings of the staircase and submit thesame for OWNERs approval.

4.14 Fire water tank

4.14.1 The fire water tank shall be an underground. The clear size and height shall

be as per requirements.

4.14.2 The tank shall be designed as a water retaining structure as per IS 456, IS3370. Grade of concrete shall be M30. Water proofing treatment, plastering,painting shall be as specified for basement. (Clause no 4.8.4).

4.15 All underground or partly underground liquid containing structures shall bedesigned for the following conditions:

Liquid depth up to full height of wall: no relief due to soil pressure fromoutside to be considered;


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Structure empty (ie., empty of liquid, any material, etc.):full earth pressure

including saturated condition and surcharge pressure wherever applicable ,to be considered;

Structures shall be designed for uplift in empty conditions with the watertable indicated in the geotechnical report or high flood level, whichever ismaximum.

The dead weight of the empty structure shall provide a safety factor of notless than 1.2 against uplift pressures during construction and in service.

Walls shall be designed under operating conditions to resist earthquakeforces from earth pressure mobilisation and dynamic liquid loads;

Underground or partially underground structures shall also be checked

against stresses developed due to any combination of full and emptycompartments with appropriate ground/uplift pressures from below to baseslab.

The walls and base slabs shall be designed for saturated earth/waterpressure corresponding to high flood level or finished plot level whichever ishigher.

All the necessary cutouts, inserts required for successfulcompletion/commissioning of UG tank shall be in CONTARCTORS scope.

4.16 Security cabin

Security cabin with RCC framed structure shall be provided at location asindicated in the drawing. The walls of the cabins shall be of Brick masonrywall (Refer data sheet item no 3) with internal /external plaster and paint asper item nos 4, 5, 6, 7. There shall be doors and windows as per item nos26, 27. The layout, design of cabins shall be got approved from OWNER.

4.17 Burnt oil tank

BO Tank of adequate with minimum oil depth (below inlet) inside tank as 2mshall be provided to collect leaked oil from the soak pit through salt glazed,pipes laid to slope. Burnt Oil Tank shall be constructed within the plot tocollect burnt oil from transformers. The tank shall be designed as per IS 456,IS 3370 and for the conditions specified in clause no 4.8 of this section. Top

slab of burnt oil tank shall be designed for vehicular movement. To achieveabove mentioned size of BOT, height shall be consider from bottom of inletpipe

4.18 Parking

Parking area shall be provided as per rules of authority.

Flooring shall be of Paver blocks as per Data sheet item no 44.

Structural steel canopy & supporting arrangement with plan galvalumesheeting (Item no 45) over parking shall be provided.


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4.19 Water supply System

CONTRACTOR shall prepare layout plan of water supply system. The layoutshall consist of source (Municipal water supply tapping point), undergroundwater tank, and overhead water tank in the building and down feed systemfrom OH water tank to various points in the building. The system shallconsist of GI pipes with gate valve for transmission of water fromUnderground tank to Overhead tank, CPVC pipes for supply water fromoverhead tank upto individual connection including necessary tees, elbows,etc and water meter of approved make. CONTRACTOR shall obtainnecessary information/permission from authority for tapping of water. Referdata sheet item nos 28,29,30,31. Some of the components/requirements ofthe external and internal water supply system were specified, howeverCONTRACTOR shall provide everything necessary and required forsuccessful completion and commissioning of water supply system.

4.20 Drainage Systems

The drainage system shall consist of internal and external drains.CONTRACTOR shall prepare the internal and external drainage layout plans;sections etc and submit the same for approval of OWNER. The internaldrainage system shall consist of UPCV stoneware pipes, Vent pipes,necessary specials such as bends, tees, elbows, traps, gratings etc. Theexternal drainage system shall consist of stoneware gully traps, inspectionchambers, sewer manholes, RCC NP2 pipes with required bedding etc. Theexternal drainage system shall be connected to municipal sewer line outside

the plot boundary. CONTRACTOR shall obtain necessaryinformation/permission from authority for connection of sewer line toMunicipal sewer line. Pipes for external drainage shall be RCC NP3 pipes asper data sheet item no and other components of the external drainagesystem shall be Refer Data Sheet item nos 32 to 36. Pipes for internaldrainage system shall be UPVC pipes of required diameter as per Data sheetitem no 37. Other accessories for internal drainage system are as specified inData sheet item nos 38 to 41. For External and internal drainage system,some of the requirements/items are specified above. However,CONTRACTOR shall provide everything necessary and required forsuccessful completion and commissioning of internal and external drainagesystem.

4.21 Approach road and storm water drain

4.21.1 The road width shall be sufficient for transportation of equipments such astransformers, GIS, pumps, motors etc and shall be complying with statutoryrules and regulations. The road shall be Wet Mix Mecadem (WMM) withminimum carriageway of 6.0m. All roads shall be provided with drainage andshall be constructed to prevent standing water. The different road layers shallbe designed as per relevant IRC codes, considering the probable load likelyto come and shall be submitted to OWNER for approval.

4.21.2 Internal Roads all around the Station shall be provided so as to give easy

access to all parts of the Project.


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4.21.3 The roads shall be suitable for movement of Trucks, Trailers, Cranes and

other construction \ erection equipments.4.21.4 The Geometric Design of road shall be as follows :

The width of carriageway shall be 6.0 m in case of Internal roads, Extrawidth shall be provided at curves.

The internal roads should not have longitudinal slope steeper than 1 in20 (5%)

The camber shall be 1 in 35 (2.85%). It should have parabolic shape foreasy drainage of rainwater.

Super-elevation shall be provided at curves. The maximum limit of thesuper-elevation shall be 1/15.

4.21.5 Roadside drains (Catch water drains) shall be provided throughout the lengthof all the roads on single side along with storm water drain chambers. Drainsshall be RCC open drains with precast perforated RCC covers designed forvehicular traffic load same as that considered for road design.

4.21.6 The necessary curb stones, road furnitures, utlity crossing pipes of RCC NP2class shall be provided where ever necessary.

4.21.7 All the storm water collected shall be disposed off outside plot boundarysuitable as per statutory norms

4.22 Transformer and associated Civil Works

4.22.1 Chain link fencing around Transformers shall be as per item no 50 of DataSheet.4.22.2 The complete area within the fencing shall be proposed to be provided with a

mild slope towards peripheral drains which in turn shall be connected to thestorm water drainage system

4.22.3 The foundation sizing for transformer and associated equipments shall bebased on geotechnical investigation report at structure location, equipmentload, transformer plan area etc.

4.22.4 Entire transformer and associated equipment area shall be provided with 75mm thick paving of 40 mm size stone aggregate on top and 75 mm thickpaving of 20 mm stone aggregate below.

4.22.5 Rail tracks of required size shall be provided on top of foundation block to

place the transformers on the foundation.4.22.6 Fire wall of 350mm thick in brick masonry shall be provided between two

transformers with proper foundation for wall. Plastering shall be as per datasheet item no 6.

4.22.7 Transformer foundation shall be in concrete grade M25 with temperaturereinforcement and with necessary trenches

4.23 Cable Tunnels

4.23.1 Cable tunnels (RCC box type) of minimum clear size 2.5m width x 2.5mheight shall be provided as shown in the attached tender drawing.CONTRACTOR shall design the tunnels. For requirement of cable tunnel


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design, CONTRACTOR shall coordinate with OWNER and OWNER shall

approve the final design.4.23.2 CONTRACTOR shall prepare cable tunnel layout based on electrical cablelayout and submit the same for OWNERs approval before construction.

4.23.3 CONTRACTOR shall provide cable supporting structure /trays inside thetunnel.

4.23.4 Minimum concrete grade for cable tunnels shall be M25.4.23.5 Box type or equivalent water proofing treatment shall be carried out to ensure

water tightness. CONTRACTOR shall give performance guarantee of watertightness for a period of at least 10 years.

4.23.6 Ventilation of Tunnel shall be as per Volume IV.4.23.7 The reinforced concrete, cast iron or heavy duty PVC pipe of minimum 150

mm diameter shall be installed in the cable tunnel sump pit to the nearest

drainage sump to drain the water in the cable tunnel.4.23.8 Cable Tunnel top slab shall be designed for vehicular load same as that used

for design of road4.23.9 For all tunnels inside the building, the floors shall be given a slope of

minimum 1 in 500 and the slope shall lead to a sump, where pump shall beinstalled for drainage.

4.23.10 MS insert plates with proper anchorages shall be provided on the walls of thetunnel to support cable trays.

4.23.11 Minimum 600 mm wide passage shall be provided in the tunnel where morethan one tier of cable trays is provided.

4.23.12 Fixing of cable trays shall be done considering bending radius of HT cables.4.23.13 Cable tunnel walls shall be designed to resist a vehicular load coming from

road above if any.

4.24 Cable Trenches

4.24.1 Cable trenches shall be of RCC type. The Outdoor cable trench covers shallbe RC precast covers and those inside the building of steel chequered platecovers (minimum 8 mm thick). Covers shall have facility for lifting.

4.24.2 Minimum concrete grade for cable trenches and precast covers shall be M25.The reinforced concrete, cast iron or heavy duty PVC pipe of minimum 150mm diameter shall be installed in the cable trench sump pit to the nearestdrainage sump to drain the water in the cable trench. For all trenches insidethe building, the floors shall be given a slope of minimum 1 in 500 and theslope shall lead to a sump, where pump can be installed for drainage.

4.24.3 MS insert plates with proper anchorages shall be provided on the walls of thetrenches to support cable trays.

4.24.4 Minimum 600 mm wide passage shall be provided in the trench where morethan one tier of cable trays is provided.

4.24.5 Fixing of cable trays shall be done considering bending radius of HT cables.All trenches shall be covered with trench cover after cable lying is complete.

4.24.6 Trench walls and precast covers shall be designed to resist a surcharge loadfrom road, if any.


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4.25 Equipment Foundations

These include support for NGR, STX, Pumps, Pipe Supports, Cable trays etc.These shall be of RCC M25 with appropriate arrangement for supportingthese equipments

4.26 Other miscellaneous structures such as DG set, Day tank etc as per projectrequirements.

5. DESIGN LOADINGS

All structures shall be designed to resist the worst combination of the

following loads/stresses under test and working conditions; these includedead load, live load, wind load, seismic load, and stresses due totemperature changes, shrinkage and creep in materials, dynamic loads anduplift pressure.

5.1 Dead Load

Dead loads shall include the weight of all structural and architecturalcomponents and other permanently applied external loads including deadload of equipment. Self weight of materials would be calculated on the basisof unit weights given in IS 875, (Part I).

The following minimum loads shall be considered in design of structures:

Loads given in IS:875 (part-I) shall be made use of for material not listedbelow.

(i) Weight of water 9.81 kN/m3

(ii) W