MS EMBEDDED Method Statement Rev10(150131) Final

PROJECT: EXCHANGE SQUARE (STREET 106 SITE) TITLE OF WORK: METHOD STATEMENT FOR LIGHTNING PROTECTION, EARTHING AND WELDING INSTALLATION AT BASEMENT 3F

project: EXCHANGE SQUARE (STREET 106 SITE)title of work: METHOD STATEMENT for EMBEDDED CONDUITS INSTALLATION 30. january. 2015-----------------------------------------------------------------------------------------------------------------------------------

METHOD STATEMENT FOR EMBEDDED CONDUITS INSTALLATION

Submission Ref. : PSC-HK-MS-E-0002Representative ofPrepare by Sub contractorChecked by POSCOApproved byPOSCOConsultant

Signature

NAME

DATE

Content1. Introdution............................31.1 Purpose...............................31.2 Scope.........................................31.3 Exclusions......................................3

2. Generals.............................................32.1 Program................................................................................................................................................32.2 Location - Address.............................................32.3 Approvals..............................................................................................................................................42.4 Labor resources....................................................................................................................................42.5 Communications...................................................................................................................................42.6 Site Resources Required......................................................................................................................42.7 Temporary material...............................................................................................................................42.8 Protection..............................................................................................................................................42.9 Equipment/Tools...................................................................................................................................52.10 Hot works............................................................................................................................................62.11 Confined space works.........................................................................................................................62.12 Emergency & Safety Equipment.........................................................................................................62.13 Materials required for installation........................................................................................................62.14 Schedule of drawings..........................................................................................................................82.15 Schedule of inspection / T&C Form....................................................................................................82.16 Attendees............................................................................................................................................92.17 Safety Briefing.....................................................................................................................................92.18 Mitigation of Risk.................................................................................................................................9

3. Actual Works Method Statement..........................................................................................................93.1 Visual Inspection...................................................................................................................................93.2 Installation.............................................................................................................................................9 3.2.1 Embedded conduit in concrete walls................................................................................................9 3.2.2 Embedded conduit in floor slab.......................................................................................................13 3.2.3 Embedded conduit in brick wall......................................................................................................163.3 Air Tests..............................................................................................................................................183.4 Water Tests.........................................................................................................................................183.5 Flow Tests...........................................................................................................................................183.6 Electrical Tests....................................................................................................................................183.7 Setting to work....................................................................................................................................183.8 Test Records.......................................................................................................................................183.9 T&C Register......................................................................................................................................183.10 Reports.............................................................................................................................................19

4. Appendix..........................................214.1 Shop Drawing number PSC-HK-SD-ELC-002-Rev2 (Waiting Approval).........................................21

1.Introdution 1.1 Purpose To describe electrical works associated with installation of embedded conduits for protection of power cables and preparing for first fix of electrical boxes.

1.2 Scope This method statement is covering the electrical works related to areas having cables running inside concrete walls, brick walls, and floor slabs. Works are carried out basing on construction schedule and detailed shop drawings approved.

1.3 Exclusions 1.3.1 Installation of the exposed conduits. (GI solid and flexible conduit)

2.General

2.1 Program (Working period: 28.01.2015 ~ 10.03.2016)NoTaskWorking timeThe number of labor

1Prepared tools and materialsAM 07:30 ~PM 05:30-

2Check of all boxes installation position2 person

3Assemble the wall and the slab boxes as shown 3.2.1.10 photos2 person

4Locate the boxes(wall and slab), and fix box to position of form work using nail fixing12 person

5Connect the boxes to designated conduits using the connector, coupling hand tighten with steel wire handle20 person

6Self-checking, the fixed boxes, the connected conduits, the boxes, conduits connection and route, check final installed positions all conduit boxes, conduit routing and connections5 person

7Make sure there is no conflict of works to other subcontractor --

2.2 Location - Address

Throughout the Exchange Square 106 street project, the embedded boxes and conduits will be installed at every floor, concrete wall, brick wall and floor slab

2.3 Approvals

2.3.1 Material of submission : PSC-HK-MAT-ELC-002-Rev1 (Approved, 28-Jan-2015)

2.3.2 Shop drawing : Lighting, small power, cable containment and embedded conduit in B3 column and ceiling : PSC-HK-SD-ELC-002-Rev2 (Waiting Approval)

2.4 Labor resources

The electrical team coordinates and carries out as below tree.

POSCO

Electric senior Manager

Park Sang Min

097-806-3610

GS Neotek

Electric Manager

Seo Sung Won

099-580-959

GS Neotek

Electric Engineer

Vandica

070-240-702

GS Neotek

Electric Engineer

Yan Co

099-580-959

GS Neotek

Electric Engineer

Sem Mun

089-225-899

GS Neotek

Electric Labor

HO kunthea

077 99 49 98

GS Neotek

Electric Labor

Sopheap

077 99 03 02

GS Neotek

Electric Labor

Ken dara

017 92 93 13

GS Neotek

Electric Labor

Nop yeang

087-202-173

GS Neotek

Electric Labor

Heng Srean

092-329-945

GS Neotek

Electric Labor

Chhouu Dara

096-307-6566

2.5 Communications

The means of communication between work areas with office mobile phone or walkie-talkie.

2.6 Site Resources Required

2.6.1 Local power supplies 2.6.2 Area clearance obtained from other discipline/ main contractor.

2.7 Temporary materials

Cable leads 20m/2set will be connected from construction temporary panel for AC 220V power supply for power tools and lighting.

2.8 Protection Designated inspectors shall protect materials during rebar working and casting concrete and prepare spare parts for damaged materials

2.9 Equipment/Tools 2.9.1 Steel wire handle 2.9.2 Steel wire (Pre cut) 2.9.3 Electric drill 2.9.4 Extension cords 2.9.5 Ladder 2.9.6 Spring Bender 2.9.7 Hammer 2.9.10 Nails

Steel wire handle Steel wire (precut) Electric drill Extension cords A Ladder Spring bender Hammer Nails

2.10 Hot works

Not Applicable

2.11 Confined space works

Not Applicable

2.12 Emergency & Safety Equipment

2.12.1 Safety Helmet 20ea 2.12.2 Safety Shoes 20ea 2.12.3 Safety Vests 10ea 2.12.4 Hand Gloves 2ea 2.12.5 Safety Goggles 2ea

2.13 Materials required for installation

2.13.1 PVC rigid conduit : 20D 1,800m, 25D 5,000m, 32D 2,000m (Including draw wires) 2.13.2 The boxes (steel and PVC) : 5,000 EA 2.13.3 PVC coupling and connector : 20,000 EA.

2.14 Schedule of drawings 2.14.1 Basement structure work : ~ 21. 07. 2015 2.14.2 Podium structure work : 28. 08. 2015 ~ 23. 11. 2015 2.14.2 Tower structure work : 28. 08. 2015 ~ 26. 04. 2016

2.15 Schedule of inspections/T&C form

Refer to ITP number ITP-E-0004 attached (3.10)

2.16 Attendees

2.16.1 Sub-contractor manager : Seo Sung Won (099-580-959) 2.16.2 Sub-contractor site manager : Su Mun (089-225-899)2.16.3 Contractor manager : Park Sang Min (097-806-3610)2.16.4. HKL M&E manager : Tran Huu Phuoc (012-833-209)

2.17 Safety Briefing

The contents of this method statement shall form the basis of a toolbox talk for all operatives before the commencement of such works.

2.18 Mitigation of Risk

2.18.1 Risk Assessment

2.18.1.1 Theft, ensure security staffs are aware steel materials installed and maintain surveillance while Exposed to eliminate risk of theft.. 2.18.1.2 Incorrect connections or materials, ensure the final installation and connections are inspected and signed off with photographic records by senior on site M&E staff from contractor, architect, client.

2.18.1.3 Damage of conduits during rebar installation and concrete casting mitigated by full time designated inspectors observing builders works

3. Actual Works Method Statement

3.1 Visual Inspection Supervisor to carry out a visual inspection of the work areas, materials, tools, safety equipment and confirm ready to commence works.

3.2 Installation 3.2.1 Embedded conduit in concrete walls

3.2.1.1 Prepare tools and materials such as PVC rigid conduit, embedded box, box connector, couplingaccessories, hand tools etc.

3.2.1.2 PVC rigid conduits shall conform to BS EN 61386-21 and BS767-2008 standard.

3.2.1.3 Conduit boxes will be installed at the positions as defined on the shop drawing to accommodate all the light switches, power outlets, lighting points and ELV equipment. Conduit boxes will be connected with appropriate sized conduits secured within the rebar matrix. Intermediate draw boxes will be installed to long conduit runs (15m) and at acute changes in direction (2bends)

3.2.1.4 Embedded conduits shall be firmly tightened with a steel wire to prevent movement during casting concrete. Distance between the steel wire for holding conduits shall be minimum 0.6m. 3.2.1.5 The embedded boxes shall be filled with polystyrene and masking tape to prevent concrete ingression to the boxes.

3.2.1.6 The conduit boxes for lighting switches, socket outlets, ELV equipment etc. shall be fixed into position with a nail fix to the form work and steel wire to the rebar.3.2.1.7 All conduits shall be installed in proper routing with a minimum bending radius as shown Deatil-5

3.2.1.8 Check all the embedded conduit works are in proper order before the commencement of casting works.

Detail-1Typical detail of embedded conduit in concrete wall & column

Note: The box mounting levels shall be complied with construction working the inking line floor D-wall

3.2.1.10 Wall box assembling

3.2.1.11 Box Installation

- Wall box Installation

- Column box Installation

3.2.2 Embedded conduit in floor slab

3.2.2.1 Prepare tools and materials such as PVC rigid conduit, embedded box, box connector, couplingaccessories, hand tools etc.

3.2.2.2 PVC rigid conduits shall conform to BS EN 61386-21 and BS767-2008 standard.

3.2.2.3 Conduit boxes will be installed at the positions as defined on the shop drawing to accommodate all the light switches, power outlets, lighting points and ELV equipment. Conduit boxes will be connected with appropriate sized conduits secured within the rebar matrix. Intermediate draw boxes will be installed to long conduit runs (15m) and at acute changes in direction (2bends)

3.2.2.4 The routing of the embedded conduits shall be laid minimum 50mm depth from face of slab.

3.2.2.5 After the bottom layer of rebar has been set up, the conduit shall be laid into position the upper rebar layer is then installed, taking care not to damage conduit.

3.2.2.6 Embedded conduit shall be firmly fixed to upper layer of rebar with the steel wire or any means to prevent movement before casting concrete. Distance between steel wires shall be at least 0.6m and in case of joint area shall be at least 0.3m. Refer to detail-3

3.2.2.7 The embedded boxes shall be filled with polystyrene and masking tape to prevent concrete ingression to the boxes.

3.2.2.8 All conduits shall be installed in proper routing following bending radius as shown Deatil-5

3.2.2.8 Check all conduit works are in order before the commencement of casting concrete.

Detail-2Typical detail of embedded conduit installation in floor slab

Detail-3Typical detail of embedded conduit installation in floor slab

Note: The conduits shall be fixed with the upper rebar, to prevent damage from anchors by builder. Anchoring is avoid near-by 200mm from embedded boxes that shall be informed of construction Builder

Detail-4Typical detail of embedded conduit installation in floor slab

Note: The conduits passing from conditioned to non conditioned space and all conduits in plenum plant rooms, must be sealed with mastic tape sealent after wiring to prevent humid air movement andwater condensation occurring inside conduits.

Detail-5Typical detail of embedded conduit installation in floor slab

3.2.3 Embedded conduit in brick/block wall 3.2.3.1 Prepare materials and tools such as PVC rigid conduit, embedded box, accessories, drilling machine, steel wire, etc.

3.2.3.2 PVC rigid conduits shall conform to BS EN 61386-21 and BS767-2008 standard.

3.2.3.3 Mark location of switches and outlet boxes on brick walls according to approved shop drawings.

3.2.3.4 The routing of embedded conduits shall be placed at the exact location of lighting switches, outlet boxes, floor/ceiling slab and according to approved shop drawings.

3.2.3.5 Use diamond saw cutter to cut brick wall accurately to create a channel, maximum depth 25mm. 3.2.3.6 The chisel and hammer shall be used to hack and remove the brick in space between the two lines to form the conduit recess. (channel) 3.2.3.7 The channels will generate support a maximum of 6 conduits.

3.2.3.8 The embedded box shall be filled with polystyrene and masking tape to prevent mortar plaster entering the boxes, and fixed into the wall with screws.

3.2.3.9 Embedded conduit shall be secured by conduit clamps not more than 1.5m apart, the channel should be covered with a plaster mesh to allow adhesion of mortar fill.

3.2.3.10 Mortar shall be used to plaster back a portion of conduit chases to ensure the conduit is properly buried into the brick wall.

3.2.3.11 After installing embedded conduits boxes and as mortar is dry, plaster work has to be applied on brick wall by plastering workers.

Detail-6Typical detail of embedded conduit in brick wall

Detail-7Typical detail of embedded conduit in brick wall3.3 Air Tests

Not Applicable

3.4 Water Tests

Not Applicable

3.5 Flow Tests

Not Applicable

3.6 Electrical Tests

Not Applicable

3.7 Setting to work

Not Applicable3.8 Test Records

Not Applicable

3.9 T&C Register

Not Applicable

3.10 Reports

4. Appendix

4.1 Shop Drawing number PSC-HK-SD-ELC-002-Rev2 (Waiting Approval)Page 1