THE ANGERED BRIDGE, GOTHENBURG

In order to relieve the recently constructed Tingstad tunnel, a ring road is being constructed around Gothenburg. On the northern section, angered bridge connects the residential areas to the north-east with three industrial estates. The bridge is 930 M long with a maximum span of 129 M, has a width of 16.95 M with three traffic lanes and separate pedestrian and cycle lanes. It has a 3% gradient rising to the east. The maximum clearance for shipping is 50 M. The invitation to tender specified that the bridge should be slender and should not dominate the landscape. The successful tender for a prestressed concrete structure came to skr. 28.1 million. Foundation conditions are variable, maximum depth to rock being 70 M. This is overlain by 40 M moraine, 10-20 M gravel and up to 20 M clay. Piling was difficult due to blocky moraine deposits; there are 160 piles per pier foundation. Some piles needed 10000 blows to set. Average length of pile is 38 M. Abutments are founded on rock. The superstructure consists of box girders. There are hinges between piers 3-4 and 5-6. The superstructure was constructed by cantilevering out from the piers. (TRRL)