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Projects of the decade: WSP

WSP has provided transport infrastructure with two new facelifts - a new City Line for Stockholm’s and improvement to the M25 in the UK.

Stockholm’s City Line

Project description

The City Line is a £1.4bn project to blast a tunnel under central Stockholm to double the city’s rail capacity with the addition of a 6km double-track railway and two new stations.

Building a new rail tunnel 10 to 40 metres below the city centre is an extremely challenging undertaking - in fact the project’s rock mechanical models are the most complex ever run in Sweden.

WSP has been involved since the early stages of the project, undertaking conceptual design and project management for the permanent way, water and wastewater installations for the whole tunnel, geotechnical investigations and conceptual designs for rock tunnels and concrete works.

WSP recently won a major multi-disciplinary contract for the central 2km of the City Line, the most complex part of the project.

This includes site supervision and project management of two sections of tunnel, architecture and structural design for City station, rock mechanics, geotechnics, M&E, risk analysis, environmental and Water & Sewerage.

Now in the first phase of construction, work on the City Line will continue for about nine years.

M25 junctions 12-15 widening and Heathrow Spur, UK

Contractors need to get on top of timescales and costs

Project description

The M25 is the busiest section of motorway in Europe, carrying over 200,000 vehicles per day. WSP, in joint venture with Gifford, provided the engineering design, design project management and construction certification services on the £150M project to widen the M25 from four lanes to five/six lanes in both directions over a distance of 11km.

A major part of the scheme was the redesign of the existing M25 Junction 14 and the design, construction and supervision of the new spur road and free flow interchange to the Heathrow Terminal 5 building.

In addition to a unique retaining wall design and construction process, the project provided considerable environmental benefits including environmentally sensitive lighting, low noise surfacing and acoustically absorbent environmental barriers.

There was extensive use of recycled materials including granular fill from the demolition of the old Wembley stadium.

The project was completed in 2005 and received a Highly Commended Major Project award at the 2006 British Construction Industry Awards as well as a Certificate of Excellence from the Concrete Society, also in 2006.

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