First Bay Bridge transition span lifted without a hitch

By D.Ann Shiffler24 April 2008

After several delays, the first transition span of the new San Francisco Oakland Bay Bridge was lifted into place on February 7-8.

San Leandro, CA-based Bigge Crane & Rigging used computer-controlled Hydrospex strand jacks to lift the 2,000 ton steel span off a barge to a height of around 200 feet within tolerances of 1/32 of an inch.

Although strand jacks are not new technology, they have never been used on this scale before in bridge construction in the US, according to Bigge.

At the Oakland side (to the east), where the skyway bridge deck has already been constructed, the strand jacks were mounted on a mobile jacking platform supported by a pair of 60 foot girders, cantilevered 28 feet off the bridge deck.

Bigge used four strand jacks, each with a lifting capacity of 365 tons. Each jack pulls on a bundle of 31 strands and each rope is 0.62 inches (15.7mm) in diameter.

“No traditional crane, particularly a barge-mounted one on the water, could have done this job with the required combination of lifting capacity and precision,” said Pete Ashton, Bigge vice president of major projects.

Delivered directly to your inbox, World Crane Week Newsletter features the pick of the breaking news stories, product launches, show reports and more from KHL's world-class editorial team.
Latest News
An update on the North American tower crane market
Morrow Equipment President and COO Peter Juhren offers his ‘state of the union’ for the tower crane sector.
Susanek appointed Palfinger COO
A move from BMW sees Alexander Susanek take on chief operating officer role at Palfinger
What is the status of the North American crane market?
Three experts discuss market indicators – interest rates, inflation and the possibility of a recession.
D.Ann Shiffler Editor, American Cranes & Transport Tel: +1 512 869 8838 E-mail:
Matt Burk VP Sales Tel: +1 312 496 3314 E-mail: