DESIGN PRACTICE NOTE PLATFORM RENEWAL … PRACTICE NOTE PLATFORM RENEWAL DESIGN ... REFER TO METRO INTRANET FOR THE LATEST VERSION Page 1 of 14 ... The design shall include cross-sections

DESIGN PRACTICE NOTE

PLATFORM RENEWAL DESIGN

L1-NAM-INS-019 Version: 2 Effective from: 23rd January 2014

Approving Manager: Chief Engineer Approval Date: 23/01/2014 Next Review Date: 23/01/2016

PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 1 of 14

Approval

Amendment Record

Approval Date Version Description

23/11/2013 1 Initial Issue under MTM

23/01/2014 2 Added Appendix 1 Platform Maintenance and Renewal Quality Checklist.






Table of Contents

1 Purpose ....................................................................................................................... 3

2 Scope ........................................................................................................................... 3

3 Background ................................................................................................................. 3

4 The Issue ..................................................................................................................... 3

5 The Requirement ........................................................................................................ 4

6 Type Approval ............................................................................................................. 5

7 References & Legislations ......................................................................................... 5

8 Appendices ................................................................................................................. 5

Appendix 1- Platform Maintenance and Renewal Quality Checklist ......................................... 5






1 Purpose

The purpose of this design practice note is to provide guidelines and detail the requirements to be considered when planning M&R platform upgrades works and confirm the permissible construction tolerances applicable to platform renewal works. This will ensure all parties involved are aware of the requirements where platform renewal works are to be undertaken.

2 Scope

This Design Practice Note (DPN) shall be applicable to all maintenance and renewals works associated with platform resurfacing and/or platform coping renewals.

3 Background

Typically when a platform renewal is undertaken, an “optimal” track alignment is designed and is based on a detailed track alignment survey to ensure the line of “best fit” is established. The proposed new platform coping alignment (line and level) is then designed based on the optimal track design. In general the platform is often constructed to match this new optimal alignment. In most cases modifications to the existing tracks are not undertaken as part of these works, however there is an opportunity for the track department to adjust the alignment during the next programmed resurfacing cycle scheduled for this section of track. Any change to track alignment will need to be assessed by NAM, Infrastructure Delivery and the PTV to determine if the track alignment is deemed necessary and the impact of this on the current AWP and the allocated budget for this element of work.

Currently, there are no defined construction tolerances for works associated with platform renewals.

In addition there have been numerous changes to standards that have defined the height of platform copings (viz; 965mm, 1015mm, 1065mm, 1080mm and more recently for new platforms, 1170mm).

The current standard for the cross fall of the finished platform surface of new platforms is 1 in 40 away from the coping edge. This has been adopted to remove the risk of a wheel chair or pram rolling towards the edge of platform and falling into the station pit. It may not always be feasible to grade the surface of existing platforms away from coping edge, for the whole of the length of platform, particularly when platform heights are to be raised to meet the current standard and where this will have an impact on the existing platform drainage, entrance/exit doors of existing buildings, waiting areas and other physical constraints around existing stairs and platform ramps. In this instance Infrastructure Delivery, NAM and the PTV shall determine when changes to the cross-fall are practical. This should be based largely on the existing physical constraints identified along the length of the platform, the scope of works and impact on M&R budget allocation.

4 The Issue

There is currently no set standard for the construction tolerances to be adopted for M&R platform renewals nor the relationship between the finished design surface levels of platforms, after construction, when compared with the track alignment.






This DPN will define the acceptable level of the construction tolerances and the working tolerances where it may not be possible to achieve the optimum track alignment as part of the platform renewal works.

The working tolerance is defined as the acceptable tolerance against the existing track alignment.

The construction tolerance is defined as the acceptable tolerance against the optimum track alignment.

The finished platform coping surface shall be constructed as per the design and must appear uniform in both the vertical and horizontal alignments.

In addition to this DPN a Quality Checklist has been developed for platform renewal and maintenance works and should be referenced, as a guide, when planning M&R works for platforms as part of the MTM AWP. Refer to (Appendix 1) for details.

5 The Requirement

From the publishing of this Practice Note, all platform renewals works shall work within the following tolerances:-

These tolerances shall apply to final platform alignment for the renewal works based on the optimal design of the platform when compared with the existing track alignment.

Platform Crossfall

The maximum platform cross fall shall be 1 in 40 away from the platform. Infrastructure Delivery, NAM and the PTV shall determine if changes to the cross-fall are practical and agree on the direction and amount of fall prior to refurbishment of the platform.

Construction tolerances

The construction tolerances for the vertical and horizontal finished coping levels shall be:-

Horizontal - 1550mm +20mm, -0mm (based on 1550mm standard)

Vertical - 1080mm +20mm, -0mm

These tolerances shall apply to the final platform alignment for the renewal works where the optimal track design alignment has been achieved.

Working tolerances

For platform upgrades where the realignment of the existing track, required to match the optimal track design alignment, is deemed necessary then the working tolerances for the proposed new platform alignment shall be:-

Horizontal - 1550mm +50mm, -25mm. (Where 1525mm is the absolute minimum for tangent track. Curve and cant effect needs to be considered for curved platforms)

Vertical - 1080mm +25mm, -25mm. A working tolerance of -25mm would be deemed acceptable provided this is 25mm lower than the optimal track design level

The current standard height for NEW platforms is 1170mm where possible or 1080mm as per the standard drawings detailed in Section 7. Therefore any upgrade of existing platforms shall be assessed by NAM and Delivery on its merits and the feasibility and costs involved in doing so. Where the new tolerances can not be met guidance shall be sought from the Chief Engineer’s office to determine if a standard waiver must be submitted to the Chief Engineer for consideration and approval.






6 Type Approval

N/A

7 References & Legislations

Standard Drawing STD_S0001 – Platform Coping Reconstruction Typical Details

Standard Drawing STD_C0019 – Installation of Steel Platform Coping over existing Bluestone/Concrete Coping, Typical Details.

8 Appendices

Appendix 1- Platform Maintenance and Renewal Quality Checklist






Appendix 1 - PLATFORM MAINTENANCE & RENEWAL QUALITY CHECKLIST

Project Location: _____________________ Date: ___________________

Phase Check Checked (tick)

Preliminary investigation

A site inspection has been conducted.

The engineer is to visit the site to assess:

The condition of platform structure and platform surface (supports, facing, coping, etc.)

Condition of subbase and assess if geotechnical report required

Establish the extent of works to be undertaken

Type of coping

The condition of the track access arrangements/Site constraints

The condition of existing drainage

Any latent conditions

Affected businesses and other stakeholders

An appropriate work method has been determined Structures and Facilities to confirm whether a track realignment is to be a part of the platform renewal works.

Design D1- Survey

A survey of the platforms and track has been arranged (Note all set-out is to be based on the optimum design track alignment).

D2 – Optimum track alignment

Design check - A design has been completed for the coping renewal and platform resurfacing (levels, offsets etc). Provide long sections detailing the vertical and horizontal alignment of the existing tracks and platform levels. This needs to be referenced to the proposed track design i.e. the optimum design must be matched to the vertical and horizontal alignments at either side of the platform. The proposed platform levels and the amount of lift and/or extension (to or away from track centre needs to be included. Show the difference between existing and proposed design. Include the chainages along the length of the platform to allow simple cross referencing between drawings.

D3 – Platform cross fall

Design check – Include details of the cross-fall of the station. MTM preference is for a cross-fall towards the centre of station (away from coping), where practical. Delivery to determine when changes to the cross-fall are practical. This should be based largely on the existing physical constraints identified along the length of the platform. Details need to indicate fall direction.






D4 – Platform cross sections

Design check – The design shall include cross-sections to suit coping sections adopted for construction purposes or at regular intervals (e.g. every 5 or 6 metres). Final As-Built drawings should show clearances & heights. Any reference to construction notes are to be removed from As-Built drawings. In general As Built drawings require cross sections. A typical cross section is considered satisfactory for minor changes to platform surface and coping. More detailed sections should be provided where significant changes and designs have been identified.

D5 – Impact of cross fall adjustments on existing assets

Design check - Include a note detailing the impact that proposed works have on existing ramps, station buildings and other station facilities and indicate measures taken to avoid design issues i.e. when platform heights are raised, how this will affect the entrance/exit doors of existing buildings. It may not always be feasible to grade platforms away from coping edge, if not, a note should be provided on the drawing detailing the reasons why.

Ensure DDA access to toilets and other station areas is not impaired.

D6 – Assessment of existing drainage condition

Check – The existing drainage is functioning. (Note:- where possible the design should avoid discharging additional run-off in to the station pit). Details of all existing drainage and proposed drainage to be referenced in relation to the cross-fall of the upgraded platform surface.

D7 – Assessment of existing drainage capacity

Check – The existing track drainage is capable of handling additional flow if discharge is to occur in the station pit.

Note:- Where appropriate a drawing note should be provided to explain when there is no expected change to flows into existing drainage, hence why no drainage changes have been included on design drawings. However, when there is an expected change to existing drainage flow, then this must be taken into consideration in the design.

D8 – Assessment of final design levels and impact ultimate finished surface levels against optimum track alignment.

Check – Design to include RL’s at chainages along platform at relevant locations, (these need to coincide with track design chainages) so they can be cross-referenced with the longitudinal sections and vertical alignment. The designers must ensure the platform is to be built within the construction tolerances to match the optimum track design, where possible.






D9 – Assessment of final track levels against optimum track alignment

Check - Designer to note that the track alignment may need to be adjusted to meet the optimum design adopted for the design of the final platform upgrade and this may need to be undertaken at a later date or during the next programmed tamping cycle.

Note: Any change to track alignment will need to be assessed by NAM and Delivery in conjunction with the PTV to determine the impact of this on the current Annual Works Plan and the allocated budget for this element of work.

D10 – Drawings to comply to current standards

Design check – Drawings to include a note/s detailing reference or compliance to relevant standards or standard drawings where applicable.

D11 – Reference to standard drawings

Check - Designs should reference standard drawings where applicable. This may not be feasible in all cases and drawings shall be prepared with sufficient detail to indicate how the platform coping has been raised and or extended to meet the current standard.

D12 – Adjustment to existing coping alignments to be clearly documented

Design check - Designers/maintainers/contractors should provide a table detailing the final lifts and extensions/cutback for new or upgraded platforms or provide the details on vertical platform/track alignment as detailed above.

Note: The table format detailing the proposed final lifts and extensions/cutbacks against existing and optimum track design (line of best fit) are a valuable tool to assist for the construction contractor to complete the works. These details can also be translated to vertical and horizontal alignment on final design and As-Built drawings to confirm as constructed details.

D13 – Drawings to be VRIOG compliant

Check - As per VRIOGS 007.2 requirements names of drawers, designers, checkers, reviewers and approvers etc, need to be in the format “first name initial – full stop – complete Surname”. E.g. J.SMITH or S.JOHNSON. Each name displayed on a drawing must have a record detailing their experience, qualifications and competencies so MTM can ensure they meet the criteria for their role, specified by the MTM Competency Management System. The details of competence of design staff are to be provided to MTM for inclusion on to the MTM Competence Register.






D14 – Confirm final As Built construction provides line of best fit

Design check - Ensure the platform is to be built to match the optimum track design (line of best fit).

NOTE: It is expected that the following standards and construction tolerances for M&R platform works should be adopted:-

Vertical Height - 1080mm +20mm, -0mm

Horizontal (from track centerline) - 1550 +20mm, -0mm

The line of best fit must sit within the above tolerances.

For curved track the effective clearance including curve and cant effects need to be included.

The new standard height for NEW platforms is 1170mm. Therefore any upgrade of existing platforms would need to be assessed by NAM and Delivery on its merits and the feasibility and costs involved in doing so. Every attempt should be made to comply with this new standard wherever possible; however, compliance to this new standard for M&R works would not be considered mandatory at this stage

D15 – Design Review undertaken by Engineering Group

Design Check - Structures and Facilities submit designs to the Engineering Group for review in accordance with MTM procedure, L1-NAM-PRO-002 – MTM Design and Technical Review Procedure

Planning PL1 – Check for existing services and impact of construction works

The location of below ground services has been identified (Note: This will be required where the platform surface is to be excavated).

PL2 – Coordinate works with other planned occupations

Check – The occupation schedule has been examined for available windows (where possible, the engineer should align asphalting works with other extended occupations to maximise the working window).

PL3 – Condition assessment of platform

Check – A visual inspection of the structural adequacy of the platform facing retaining wall including tie backs, where applicable, have been undertaken and assessed by the designer or structural engineer to ensure the platform is able to support the proposed construction plant and equipment.






(Note: if the platform facing is in poor condition or has been cut back an engineering assessment must be sought before work commences).

As part of the visual inspection the condition of the sub-grade material has been assessed in areas where the platform surface has subsided. These areas are to be backfilled and suitably compacted to a quality equal or better than that of the surrounding platform prior to resheeting with asphalt.

Procurement PR1 – detailed workscope has been prepared and all quantities have been identified

PR2 – Undertake an inspection with preferred contractors

A pre-tender site inspection has been conducted with the preferred contractors

PR3 – Ensure retention money is held to cover defects liability period

Check – The contract allows for retention of security till the end of the defects liability period (usually 12 months)

PR3 – Contract to include Quality Assurance for services and material supply

Check – The contract specifies use of premium grade asphalt (not recycled material).

Note: recycled material can be used as sub-grade, provided the material is compacted to a quality equal or better than that of the surrounding platform. VRIOGS 002.1 is to be used as a guide for the level of loading platforms are required to accommodate.

Pre-Construction

PRC1 – Confirm track occupations have been granted

Check – The track occupation has been booked and is in the occupations schedule

PRC2 –Assess and arrange isolation permits where required

Isolation permits have been arranged, (if required)

PRC3 – Arrange/Implement traffic management plan

A traffic/pedestrian management plan has been prepared (if required)

PRC3 – Notify stakeholders/public of upcoming works

Letter box drops to nearby residents/business have been carried out






PRC4 – Ensure SWMS and JSEA’s for planned works have been submitted and reviewed

The contractor’s safe work method statements have been reviewed and all staff are suitably qualified (e.g. Rail safety worker card including details of training, competencies, tickets and level of safeworking qualifications)

PRC5 – Areas for stockpiling identified and agreed with stakeholders

Areas for stockpiling have been identified, agreed with customer services and clearly marked out

PRC6 – Implement safety signage and advanced warning notices to customers and stakeholders

Safety signage/ Advance warning/notice signage is in place and alternative bus routes arranged.

PRC7 – Arrange line marking and Tactile Ground Surface Indicators to be reinstated

A line-marking machine has been booked by the contractor and tactiles reinstated. Water based paint and non-slip surfaces are to be used as per current MTM practises and requirements. Details to be included in the scope of work.

PRC8 – Ensure all affected platform furniture has been reinstated

Platform furniture has been removed and to be relocated after works completed. Details to be included in the scope of work.

PRC9 – Confirm final platform coping alignment meets proposed design.

Platform coping levels and offsets have been measured, certified and checked against the proposed platform design by Delivery (Structures and Facilities). Refer to checks noted in the Design Section.

PRC10 – Impact of tree roots and vegetation on platfrom surface to be assessed and rectified

All surface undulations due to tree roots have been removed (prior to main works occupation). An Arborist may need to be engaged to undertake an assessment where required.






Construction C1 – Ensure asphalting works compy with current Standards

Note: All construction works relating to the resheeting of platform surface to be undertaken in accordance with Australian Standard AS1250 – 2005 Hot Mix Asphalt - A guide to good practise

A tack coat has been applied where new asphalt has been placed on existing asphalt. A tack coat has been run continuously along the line of the tactiles. For efficiency and productivity a self propelled paving machine has been specified in the contract document, where appropriate.

Note: If the platform structure is unable to safely support the paving machine, the machine must be kept away from the platform edge by a distance equal to the angle of repose. If the platform cannot support the weight of an asphalt machine, the asphalt will be placed from the track side, spread manually, rolled using a hand roller and compacted with a vibrating plate. Note:- refer to requirements of visual inspection and assessment by structural enginer as detailed under planning above.

C2 - Ensure QA process in place for asphalting works

Check – The temperature of the asphalt is not lower than 90oC before placing. Note: for layers of 40mm or less the asphalt temperature must be at least 135oC as per AS1250.

The aggregate size is no larger than 7mm. Details to be included in the scope of work.

The asphalt is applied in layers not exceeding 30mm or less than 20mm as per AS1250.

The asphalt thickness is at least 50mm, 1500mm in from the coping edge (to enable fixing of tactile indicators). Details to be included in the scope of work.

The sub-grade material is suitably compacted to withstand loads as defined in VRIOGS 002.1. (As a minimum compaction must be undertaken with a vibrating plate and compacted to the satisfaction of the site supervisor).

All butt joints have a clean edge and are full depth. (Note: If required the edge is to be saw-cut to achieve a straight, clean edge).

The maximum platform cross fall is 1 in 40, irrespective of direction. The finished compacted surface is flat (i.e. no pooling of water). A 3 m long straight edge has been used to check the flatness of the surface. The finished surface is to be graded sufficiently to prevent pooling of water.






C3 – Ensure final housekeeping and all assets reinstated after works completed

Platform furniture has been reinstated before passage of the first train. (Note: Where the platform furniture cannot be reinstated, any protrusions/trip hazards must be made safe with protective bollards or other measures. Pits, seats and bins have been re-levelled to match the new cross-fall).

Note:- Tactile indicators will need to be installed as soon as practical following the platform resurfacing but no less than 1 week following completion of the asphalting work

New platform coping levels and offsets have been measured and certified prior to commencement of asphalting.

The area is safe for pedestrian traffic prior to passage of first train Train Stops/Cats-eye markers indicating the train stopping points have been reinstated to their original locations before passage of the first train

Close out CO1 – Final inspection, quality check and defect identification

A final inspection of the works has been conducted following completion of the works by the Structures and Facilities Renewal Engineer or qualified delegate to identify and document defects that require rectification.

CO2 – Develop action plan for fault rectification

An Action Plan to close out defects has been developed with target completion dates as agreed by stakeholders.

An As-built survey has been completed and documented on the design spreadsheet and DMS Drawings amended in accordance with VRIOGS 007.2, Infrastructure Drafting Standards.

DMS drawings have been submitted to the Engineering Group for review and submission to DMS

Structures & Facilities to provide the relevant Ellipse Asset Change Request Forms to NAM so the Ellipse Data base can be updated.

CO3 – Update Ellipse data base

Asset Systems to update the Ellipse Data base and ensure details are uploaded into PASS Assets.

Note:- This information must be provided by Infrastucture Delivery.






CO4 – Prepare Form 24 and arrange sign off by Asset Manager

Check – Completion of Form 24. This must be signed off by the relevant Discipline Asset Manager(s).

Note: The majority of the Form 24 can be completed prior to the close out period.

CO5 – Assess site to determine if Mind the Gap markings are required

Check - After completion of the works the site has been inspected to determine extent of final gap between platform and train to determine if Mind the Gap markings are required.

Note:- This needs to be arranged ASAP in accordance with Chief Engineer’s Directive, L1-CHE-GDL-003 – Mind the Gap – Curved Platforms.

CO6 – Finalise and close out defects list

Check - Completion of the Defects List and Mind the Gap markings where required.

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