Colas' Construction Projects team were awarded a contract to build a new commercial and household waste recycling centre at Harefield in Middlesex for London Borough of Hillingdon.
The project requires the redevelopment of the existing site that managed household and commercial waste alongside winter maintenance operations for highways.
The upper level roads and yard areas were all cast in-situ with fibre reinforced concrete.
A low level retaining wall was constructed to provide vehicle containment and a lower level for the recycling banks.
The office roof was secured and utilised a steel panel construction for security.
All construction fills were sourced from on-site deposits or imported recycled aggregates.
The final works area was made available to Colas after funding was agreed.
Concrete piers were cast in-situ to provide high level public access to the recycling containers.
New heavy security gates were installed to the site entrance from New Years Green Lane.
Colas specified fibre reinforced concrete for new concrete pavements in the central operational area.
Rehabilitation, encapsulation and partial demolition of existing walls took place depending on their structural condition.
The central site area forms the hub of all drainage works.
Surfacing was carried out on the principal access route at night to avoid disruption to client operations.
Further drainage attenuation was installed using the recycled plastic cells and glass sand.
Ahead of schedule, the initial phase of works was handed over to the client and the second phase began.
Building works to the new office building started on the 5th March 2012.
Foundations for the office and amenity building were cast in-situ in the form of a reinforced concrete raft.
A 'Unilog' retaining wall system was installed behind the new office block at the end of January 2012.
A salt barn for winter maintenance was erected and the surrounding pavements were overlaid with a fibre reinforced concrete slab.
To comply with Environment Agency requirements, Colas began installation of an underground surface water attenuation system.
Site clearance including demolition of buildings and retaining walls commenced in November 2012.
Colas commenced works at Harefield in July 2011, taking occupation of the first phase area on the 11th July.