CASE STUDY: M25 Widening Junction 27 – 30
Client: Skanska Balfour Beatty Joint Venture
Location: M25 Junctions 27 - 30, Essex
Contract Dates: July 2009 - July 2012
Contract Value: £35,000,000
Form of Contract: NEC3 Option C Target Contract with Activity Schedule
Description:
Widening 27km of the M25 motorway between junction 27 – 30 from 3 lanes to 4 lanes in each direction using a variety of structural ground retaining solutions & strengthened/unstrengthened earthworks solutions.
Works include:
39Ha of site clearance under ecological & archaeological watching brief.
750,000m³ of bulk earthworks hauled using a combination of articulated dump truck and 8 wheel tipper lorry.
150,000m³ of Structural backfill to extruded concrete retaining wall and sheet pile walls.
75,000 m³ of reinforced earthworks.
Formation of piling platforms to facilitate gantry and sheet piling operations.
Placement of over 700,000 tonnes of capping & sub-base.
Formation of foundation for SFRW, slot drain, VCB in the verge and central reserve.
Excavation of 11 balancing ponds.
Recycling of site won and locally sourced demolition material to provide over 700,000 tonnes of capping, sub-base and structural backfill.
Construction of landscape and environmental features including flood alleviation zones & noise mitigation bunds.
Resoiling and grass seeding of all soft areas
Description:
Widening 27km of the M25 motorway between junction 27 - 30 from 3 lanes to 4 lanes in each direction using a variety of structural ground retaining solutions & strengthened/unstrengthened earthworks solutions.
Works include:
39Ha of site clearance under ecological & archaeological watching brief.
750,000m³ of bulk earthworks hauled using a combination of articulated dump truck and 8 wheel tipper lorry.
150,000m³ of Structural backfill to extruded concrete retaining wall and sheet pile walls.
75,000 m³ of reinforced earthworks.
Formation of piling platforms to facilitate gantry and sheet piling operations.
Placement of over 700,000 tonnes of capping & sub-base.
Formation of foundation for SFRW, slot drain, VCB in the verge and central reserve.
Excavation of 11 balancing ponds.
Recycling of site won and locally sourced demolition material to provide over 700,000 tonnes of capping, sub-base and structural backfill.
Construction of landscape and environmental features including flood alleviation zones & noise mitigation bunds.
Resoiling and grass seeding of all soft areas
