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West Anglia Main Line (WAML) Earthworks and Drainage

Civil Engineering

NOVEMBER 2017 – OCTOBER 2018

£3.1m

LEA BRIDGE TO MERIDIAN VALUE WATER

Download full PDF case study

Key Information

5.5km of track foundation

Removal and reinstatement of soft spots providing CBR, DIN and materials testing at 50 metre intervals

Installation of perforated and carrier track drainage systems and deep surface water drainage systems

As part of the Railway Upgrade Plan, Network Rail are investing £170m for improvements across Upper Lea Valley between 2017 to 2019.

In this project, our work ensured that there was increased capacity on the line which reduces congestion for passengers and freight. In turn, this allows regeneration projects in the Upper Lea Valley area to run smoothly and, in turn, attract more people to live there. This line would make a difference to tens of thousands of people that use this route on a daily basis.

Project Deliverables
The upgrade entails 5.5km of new track which will allow an extra two trains per hour (during peak times) to run between Stratford and the new Meridian Water station, reducing congestion for passengers and supporting regeneration across the Upper Lea Valley area.

Pod-Trak undertook delivery of the civils aspect, this included:

  • Reduced level dig
  • Installation of 5.5km of a Primary Type 1 formation and structure transitions
  • Removal and reinstatement of soft spots providing CBR, DIN and materials testing at 50 meter intervals
  • Installation of perforated and carrier track drainage systems and deep surface water drainage systems
  • 1 no. Drainage and 5 no. Utility UTX’s.
  • Culvert strengthening works
  • 750 meters of elevated and concrete trough works
  • 5 no. Gravity OLE Bases
  • 5.5km of bottom ballast installation utilising 2D Dozers
  • Construction of 330 meters of reinforced earthworks bund which acted as a noise barrier
  • Site wide hardscaping

Challenges and Solutions
The site was divided into 9 zones, each zone with a different site access date (design). Pod-Trak, in collaboration with the client, rescheduled and accelerated available works to ensure sectional completion and more importantly, continuity for the Permanent Way team. Production was increased, regardless of the high volume of soft spots encountered.

To mitigate this issue, we installed a geogrid combined with a PW1 Terram to achieve the required CBR at formation level, reducing the potential excavations by 50% and allowing works to proceed efficiently, meeting the key handover date.

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