Second Severn Crossing. United Kingdom


Services provided by Jacques Combault

Scientific Director and Technical Advisor for bridge construction.


Owner

Severn River Crossing Plc

Cost

£380 million

Completion Date

June 5, 1996

Project completed by staff prior to FINLEY

The crossing is 3.186 miles (5.127 km) long, consisting of a single central navigation span over the “Shoots” channel and approach viaducts on either side.  The 37 bridge pier foundations on the approach viaducts are 98.11m (321.9-ft) apart and consist of concrete pneumatic caissons weighing 37 tons, which were sunk into the mud of the estuary. The decking consists of 3.5m (11.5 ft) post-stressed match cast sections, weighing 200 tons each.  The cable-stayed section of the crossing is over 900m (2,953 ft) long, consisting of a 35m (115 ft) wide deck made from steel plate girders with a composite reinforced concrete slab. These were prefabricated on shore and put in place using balanced cantilever methods. There are two 149m (489 ft) high twin leg, reinforced and pre-stressed concrete pylons carrying 240 cables which support the bridge deck.

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