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Bay Bridge East Span |
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Links NewBayBridge.org Bay Bridge East Span Project Web Site Articles 8/21/2000 Remaking The Bay Bridge Remaking The Bay BridgePile-Driving to Begin For Bay Bridge Section Key study not done, but Caltrans pushes ahead 10/12/1999 Bracing Roadways for QuakeCommuters pay price for world's largest seismic retrofit project Michael Cabanatuan, Chronicle Staff Writer Loma Prieta's brutal 15-second assault battered the Bay Area's transportation system like a prizefighter unleashing a relentless flurry of punches on an undersized opponent. It busted up the Bay Br... 10/12/1999
Bracing Roadways for Quake 09/22/1999
Fed-Up Mayors Say to Retrofit Bridge Instead 09/16/1999
Bay Bridge Fix Can't Wait, Say Geologists 06/26/1998
E. Bay lawmaker wants election on bridge design 10/17/1998
Caldecott Tunnel Under Seismic Scrutiny 03/17/1999
Bridge design safety disputed by S.F. mayor 03/16/1999
Mayor agrees: Bay Bridge plan unsafe 05/11/1998
A Bridge for the 21st Century
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PROJECT OVERVIEW The collapse of a portion of the upper deck of the Bay Bridge following the Loma Prieta Earthquake demonstrated the critical need for seismic safety on Bay Area bridges. Caltrans is conducting a seismic upgrade for the Bay Bridge, which encompasses six projects. This site provides information on the upgrade of the East Span section of the bridge, which runs from Yerba Buena Island to the Oakland shore. The formal name of this effort is the San Francisco-Oakland Bay Bridge East Span Seismic Safety Project, known more simply as the East Span Project The preferred alternative will construct a new bridge (two
side-by-side bridge decks, each with five lanes plus shoulders) north of
the existing bridge and will dismantle the old bridge. The replacement
bridge will be a combination self-anchored suspension/skyway design, which
was recommended as the locally preferred option by the Metropolitan
Transportation Commission (MTC)
after extensive reviews. The new span will include a bicycle/pedestrian
path on the south side of the eastbound deck. PROJECT UPDATE 7-21-02 The California Department of Transportation has awarded a $10.9 million contract to Parsons Brinckerhoff to perform biological monitoring during construction of the new self-anchored suspension bridge in San Francisco Bay. The bridge construction is taking place in a biologically sensitive area and one of the world's richest estuary/marine environments. 5-14-02 PASADENA, Calif. - Ameron International
Corporation ("Ameron" or "Company") (NYSE:AMN)
announced today that its Water Transmission Group has been awarded a
contract totaling almost $57 million to supply large diameter steel
pilings for the foundation of the new eastern section of the San
Francisco/Oakland Bay Bridge. The bridge section that will be replaced
collapsed during the 1989 San Francisco earthquake. The overall
replacement project which includes seismic upgrades, new ramps, a skyway
and a new suspension bridge is estimated to cost $2.6 billion. The
California Department of Transportation (Caltrans) has awarded the prime
contract to KFM, a joint venture between Kiewit Pacific, FCI Construction
and Manson Construction. 4-7-2002 When finished the bridge will look like this:
Scale Model
The new bridge is expected to cost 2.6 billion dollars with the money coming from surcharges placed on local bridges. Construction has begun on the bridge in late January and we will have updates posted here. 1-2-2001 Pile Installation Demonstration Project Completed (Provided by Caltrans)
Caltrans conducted the PIDP to test the procedures and effects of driving large steel piles through relatively soft soils into the dense sands of the Alameda Formation that exists below the Bay’s waters. Caltrans installed massive battered piles (piles installed at an angle) through the Bay's waters. The piles measured 2.5 meters in diameter (8 feet) and 107 meters in length (350 feet). The pile size is unique, as is the method used to drive the piles into the soil. Two of the three piles were installed at an angle of one horizontal length to six vertical lengths or 9.5 degrees from vertical. The test consisted of driving three piles at two sites near the existing East Span alignment. The test sites were located in open water and fell within the Caltrans maintenance area that extends both north and south from the centerline of the existing bridge. Caltrans identified the test sites based on soil conditions and their location within the East Span Project area. Caltrans also considered additional criteria including adequate water depth and minimal potential conflict with other marine vessels or future bridge construction operations. The PIDP was conducted to determine the minimum hammer energy required to drive piles and to allow engineers to study the pile behavior during driving. The demonstration also allowed engineers to observe the process of welding large pile segments together at the open water sites. This information will allow project engineers to define appropriate construction procedures and equipment requirements for construction of the East Span. Caltrans monitored and recorded aerial and underwater sound levels during the demonstration to identify possible effects on species such as harbor seals that have a rest area on Yerba Buena Island. Air bubble curtains were used for sound attenuation during pile driving. Caltrans and the National Marine Fisheries Service will use the data to establish mitigation measures that will help minimize potential impacts to marine mammals and to fish during construction of the East Span Project. The results of the PIDP are expected to reduce costs, reduce delays, and aid potential contractors in preparing accurate bids for the skyway and main span portion of the East Span Project
8-21-2000 Test pile program is scheduled to begin in late September and continue until early November. It is an $11.5 million test to determine how best to push supporting piers for the bridge through the 360 feet of muck and sand on the floor of San Francisco Bay to the bedrock below. Design work is 95% complete on the preferred alternative. In October the Army Corps of Engineers will come with their report on whether a new bridge should be built or the old one retrofitted. If the report concludes a new bridge should be built the construction would begin next year with completion in 2005.
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The
Pile Installation Demonstration Project (PIDP) conducted from October 19,
2000 to December 13, 2000 is expected to provide information on
construction techniques for the East Span Project. The piles used for the
demonstration project are the same type that have been developed for the
risk design's main span and skyway structure foundations. Similar
foundations would be developed for the other build alternatives. The
large, deeply driven piles repres ent innovative technology that will be
used to construct the East Span. The support from the large steel piles is
a critical seismic safety feature for the East Span. 