Interstate 580/680 Interchange
Location: Pleasanton, California
FCI Constructors, Inc. Northern Division is modifying an existing freeway-to-freeway interchange in the San Francisco Bay Area. This $55 million Caltrans project will relieve congestion at one of the busiest freeway interchanges in the Bay Area, with a recorded use of over 300,000 vehicles a day. To increase the contractor's challenge of working on such a highly traveled freeway, Bay Area Rapid Transit (BART) trains run through the project, and any contractor delays to train movement incur sizeable penalties. Project completion is expected in June 2002, a year ahead of schedule.
Project Features:
- Interchange modifications based upon 3 new connector structures, a total of 8 bridges ranging from 158 feet to 4,395 feet
- New 20 span, 4,395 foot long, cast-in-place concrete box girder flyover ramp bridge connects southbound I-680 to eastbound I-580
- 3 additional new box girder bridges plus widening of 3 existing precast concrete girder bridges
- 10 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
Special Conditions:
- 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:
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