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Project Overview:
FCI North
modified an existing freeway-to-freeway interchange in the
San Francisco Bay Area. This $55 million Caltrans project
relieved congestion at one of the busiest freeway interchanges
in the Bay Area, with a recorded use of over 300,000 vehicles
a day.
To intensify the challenge of working on such a highly traveled
freeway, Bay Area Rapid Transit (BART) trains ran through
the center of the project, and any contractor delays to train
movement incurred sizable penalties. Despite these challenges,
crews sucessfully completed this project in July, 2002.
580/680 Project
Photos:
Summer
2002
Project Features:
Interchange modifications based upon 3 new connector structures
- a total of 8 bridges ranging from 158 to 4,394 feet
A new 20-span, 4,394-foot-long, cast-in-place concrete box
girder flyover ramp bridge connecting southbound I-680 to
eastbound I-580
Three new box girder bridges plus widening of there existing
precast concrete girder bridges
Ten, MSE retaining walls (41,000 square feet)
Project statistics include 3,521 driven piles; 53,085 cubic
yards of structural concrete; 140,000 cubic yards of earthwork;
62,100 tons of asphalt concrete; and over 13 million pounds
of reinforcing steel
Interesting Facts:
Construction of the flyover connector over two interstate
freeways and BART
Lane closures only allowed at night
Deep excavations (over 20 feet) were shored with soil nailed
shotcrete walls where the clearances between the traffic and
the new structure did not allow standard shoring systems
Project Related Links:
California Department of Transportation
http://www.dot.ca.gov
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