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Transbay Bus Ramp

San Francisco , CA

  • Installation of 21 ea. CIDH foundation piles for a bridge to connect Bay Bridge to Transbay station.

  • 13 ea. 108” Diameter x 93’ deep average CIDH shafts, 123’ max depth.

  • 4 ea. 96” Diameter x 150’ deep CIDH Shafts.

  • 4 ea. 84” Diameter x39’ deep CIDH Shafts.

  • Vibratory installation of 10’-12’ diameter top cans for shaft stability and safety.

  • SONICALIPER tests were performed on all shafts to less than .5% verticality or 6” per 100’ of shaft.

  • Materials encountered ranged from fill to dense to very dense colma formation, old bay mud and San Franciscan complex berock with greater than 12,000 psi.

  • Shaft drilled and installed with Bentonite Slurry.

  • Job performed with ZERO anomalies.

Project Team

  • Owner: Transbay Joint Powers Authority

  • General Contractor: Shimmick Construction

  • Foundation Contractor: Case Pacific Company

  • Project Manager: Will Gehrke

  • Superintendent: Randy Virdel

  • Designer:

  • Project Cost: $57 Million

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