BASE OF THE NEW BAY BRIDGE TOWER
When it is a high profile job and it has to be done right the first time, C. H. Bull is the “A Team”. C. H. Bull Company was asked to supply a jacking system for lowering the 3500 ton base (that is 7,000,000 pounds) of the main Bay Bridge tower 28 feet to the bottom of the San Francisco Bay.
noun: A-team; 1.a group of elite soldiers or the top advisers or workers in an organization.
C.H. Bull worked with the design engineers and came up with a system using threaded rod to safely lower the base. Each corner had four 500 ton jacks and eight threaded rods which were attached to the base.
To equal the load a 3 point jacking system was used. Two sets of jacks were connected to one port on the manifold. With a 3 point system the load was always equal on all 4 groups of jacks. The base was safely lowered to the bottom of the Bay and then filled with another 3500 tons of concrete.