East London Line Platform Extensions

As part of the London Overground Capacity Improvement Programme, Cleshar were appointed to undertake the design and construction of platform extensions on thirteen stations on the East London Line and South London route, to accommodate new 5-car trains being brought into service.

 

On the East London Line, station platforms were extended at Highbury & Islington, Canonbury, Hoxton, Haggerston, Dalston Junction, Shoreditch, Shadwell, Wapping, Canada Water and Surrey Quays. Along the South London route station platforms were extended at Wandsworth Road, Clapham High Street and Clapham Junction.


Scope of works
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Multi-disciplinary works were carried out at each station. All extensions to platforms maintained similar styles of finishes and equipment as the existing. Works varied at each station, but generally comprised the following:

Site Surveys and Design

  • Topographical, track layout, structures condition & services dilapidation surveys

  • Platform structure, and finishes

  • Platform Lighting, CCTV, PA, and telephones

Site Works

  • Site clearance, de-vegetation, and demolition

  • Services enabling and protection

  • Temporary works

  • Groundworks; foundations, cable pits and ducts, drainage and retaining walls

  • Platform structures: front & cross walls, suspended and ground bearing slabs

  • Driver’s gantry platforms, platform end ramps and steps

  • Platform coper units, tactiles, drainage channels, cladding, end barriers, VE panels and signage

  • Platform lighting, PA, CCTV, and telephones

 

Client

LOCIP – London Overground (TfL)

Location

East London Line

Contract Start and Completion

August 2013 – September 2014

 
Innovations

GRIP 4 single option development designs provided by LOCIP, were critically reviewed to see if the scope of design and construction works, and implementation time could be reduced whilst still achieving the same operational requirements

 

In parallel with intrusive station surveys covering all disciplines, value engineering exercises were carried out on a station-by -station basis to provide the best design solutions. These were then developed as GRIP 5 detailed designs, approved for construction.

 

As a result of the value engineering undertaken, the following innovations were achieved:

  • Steel and grp gantries were constructed (where appropriate) at the ends of the platforms, for driver access onto trains

  • Reduced lengths of passenger platform were constructed, whilst still maintaining access to all 5 cars

  • Widths of platform were reduced where possible to the first and last carriages following passenger number and ped route analysis

  • Platform lighting, CCTV and PA was rationalised to suite the adjusted public and staff platform areas

 

Designs and construction methods were changed and adapted to allow maximum flexibility in being able to work effectively during all available working times e.g., within blockades, weekend, and weeknight possessions. Working during traffic hours was maximised through designing smaller manually handled elements and using techniques that did not required the use of heavy plant and RRV’s e.g., componentised beam and block platform slabs in lieu of rc in-situ slabs. In addition, temporary works and barrier systems were set up to provide protection to operatives working on the platforms whilst trains were moving

 

To carry out works on multiple stations concurrently, separate teams of managers and engineers were assembled, and were allocated 2-3 stations each (depending on size). These station teams were responsible from commencement, undertaking planning, arranging access and surveys, through to construction on site and completion. This approach meant that the knowledge and learning about each station was built up and remained within the team. This proved to be of great benefit to the speed of implementation that the programme demanded.

 
Benfits / Project Outcome

The benefits that resulted from the innovations, and the reduction in the amount of construction works required to be undertaken within an operational railway environment on each of the station to extend the platforms were:

  • Reduced site construction time

  • Cost savings on the project which were shared between the client and Cleshar

  • Less possession working and impact on customers

  • Reduction in the use of expensive heavy RRV plant and equipment

  • Early involvement and handover of assets to the operator and maintainer

  • Early bringing into use of extended platform areas

  • No delays were experienced, and the project programme was achieved for the introduction of new 5-car trains

 

The overall effect of the benefits gained, was to achieve the successful completion of project which met the client’s requirements in terms of both cost and programme. The result was to deliver extended platforms on all thirteen stations, brought into use prior to the introduction of the new 5-car trains services. All which achieved the project goals, to the mutual benefit of the client and Cleshar.