Est. Completion Date:
February 03, 2014
An American Bridge led joint venture is general contractor for the new East Bay Bridge mainspan of the San Francisco/Oakland Bay Bridge. This project includes the construction of a new 2,051' (625m) single-tower, self-anchored suspension bridge. The steel tower is 525' (160m) tall, composed of four legs strutted together. The 1,854' (565m) suspended span includes a 1,263' (385m) main-span and a 591' (180m) side span. The deck is over 197' (60m) wide. The 4,600' (1,400m) long, 31.5 inches (800mm) in diameter main cable is continuous from east deck anchorage to tower top saddle to northwest deviation saddle to center jacking saddle to southwest deviation saddle back to tower top saddle and back down to southwest deck anchorage. The total weight of the structural steel is 55,285 tons (50,145mt). With the exception of the caps for the east and west piers, this entire contract is comprised of structural steel fabrication and erection. Over a dozen fabricators supplied product for the bridge, overseen by ABF quality control teams and scheduled and coordinated by ABF engineers. The deck is composed of twin steel boxes of 92' (28m) each, strutted together for an out-to-out width of over 197' (60m). In addition, there is a 17' (5m) wide bike path that is cantilevered from one of the 28m boxes. The deck panels are of varying lengths and weigh between 500 and 1,550mt each. The total structural steel weight of the deck is 34,000 tons (30,844mt). The cable has a weight of 5,720 tons (5,189mt), and the hanger ropes weigh an additional 715 tons (649mt). The cable is made up of 137 prefabricated parallel wire strands (PPWS) with 127 wires per strand compacted and wrapped with "s" wire. The cables are anchored in the deck of the structure, making it self-anchored (no gravity anchors). As a result, the orthotropic box girder deck structure was constructed on falsework while the main and hanger cables are being erected. When both activities are complete, the entire load of the deck superstructure, over 30,000mt, will be transferred from the falsework to the hanger and main cable in a carefully engineered and precisely sequenced operation.