Connect Plus/Highways Agency
M25 Junctions 27-30, Greater London
DAWSON WAM was awarded the contract for the installation of permanent sheet piled retaining walls to allow for the M25 carriageway widening scheme to proceed in 2010. Due to the successful completion of the 4B Scheme DAWSON-WAM were awarded the following 4C Scheme of the works that was commenced in February 2011.
In all over 5,200 linear metres of sheet piles were installed with piles up to 18m in length into Stiff Clays.
Our roles included;
DAWSON-WAM undertook the scheme under the goals set out in its sustainability policy and matched the requirements of the SBBJV sustainability plan and diversity plan for the scheme. The M25 was classed as an environmentally active and sensitive area and strict protocol’s were put in place to ensure as little disruption to as possible to the natural environment and wildlife. We installed piles beside watercourses and to do so we used plant nappies and drip trays to ensure no contamination would go into the watercourses. All our equipment runs on biodegradable hydraulic oil. Also water voles habitat was monitored while piling, to ensure that minimum distress and damage was caused to the habitat and voles.