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Seismic Retrofit | by Leighton Wallis
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Seismic Retrofit

A $392 million program was initiated to improve the structure's ability to withstand such an event with only minimal (repairable) damage. One challenging undertaking is completing this program without disrupting traffic. A complex electrohydraulic synchronous lift system was custom built for construction of temporary support towers and a series of intricate lifts, transferring the loads from the existing bridge onto the temporary supports. This was completed with engineers from Balfour Beatty and Enerpac, accomplishing this task without disrupting day-to-day San Francisco commuter traffic. The retrofit's planned completion date is 2012.

 

Wikipedia

 

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Taken on December 6, 2011