Marine Construction

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Bridges

San Francisco-Oakland Bay Bridge - San Francisco, CA

Customer:
California Department of Transportation

Location:
San Francisco, CA

Project Description
The San Francisco-Oakland Bay Bridge project consisted of construction of a 1.3 mile, dual span skyway with 28 in-water foundations. Construction began in June 2002 and was completed in December 2007. Manson was a joint venture partner in the project with Kiewit and FCI.

The project began with access dredging to allow for the floating equipment to reach the work area. This work included excavation and disposal of 455,000 cubic meters of material through clamshell dredging.

Next, pier footings were constructed, supported by a total of 160 cast-in-steel-shell (CISS) concrete piles. The inside of each pile was excavated with a hammer grab bucket handled from a derrick barge before being filled with concrete. Pier columns were then constructed, with the tallest extending 144 feet. A cast-in-place pier table was constructed, and 452 pre-cast concrete segments, the heaviest weighing 800 tons, were barged to the job site for placement on the table.

The project also included construction of an in-water pier to support the eastern end of the self-anchored suspension span and a foundation for the main tower of the span just off the east shore of Yerba Buena Island in soil conditions drastically different than those of the skyway eastern end pier and required unique drilling techniques. The fabricated steel box for the main tower foundation weighed 2,300 tons.

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