The Galliford Try, Costain and Atkins joint ventures awarded DNS the contract to undertake ground stabilisation for a soil piling mat, on behalf of their client United Utilities.

The 9000m2 area was mainly made ground with a high organic silt content. The site was cleared of several tonnes of house bricks, concrete and reinforced steels and relocated on site. Buried foundations and the remains of a number of old piles were excavated prior to the stabilisation process.

The in situ material was blended with ‘RoadCem’ product – ‘a fine powdered blend which enables the binding of nearly all kinds of materials’ –  to create a stable platform. This will prevent cracking or bounce during the piling programme.

A layer of crushed was then applied to the stabilised area to give extra traction and avoid any dust created during piling.

The project is part of the £3.6 billion being invested by UU across the North West to improve water quality and the environment by 2015. It comprises of a new 4,500m3 storm retention tank and diversion chamber designed to store storm sewage and prevent discharge in periods of heavy rainfall to the local watercourse.


Project Type Site Clearance / Soil Stabilisation
Client GCA Joint Ventures
Completion Date August 2014
Project Size 9,000m2
Contract Value £265k


  • Excavate made ground below stabilised platform levels
  • Remove large debris and hard materials
  • Stabilise surface of platform
  • Supply and lay stone material over formation levels

Galliford Try plc is a leading UK housebuilding and construction group. It is listed on the London Stock Exchange and a member of the FTSE 250.

The construction business carries out building and infrastructure work across the UK with clients ranging from major Government departments through to regulated utilities and private sector companies.

The group generates revenues of £2.8 billion.

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