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AGRA Foundations, Inc.

AGRA Foundations, Inc. Richmond/San Rafael Bridge HIGH CAPACITY MICROPILE CONSTRUCTION. Photograph courtesy of California Department Transportation. Richmond/San Rafael Bridge. Completed in 1956, the 5.5 mile long bridge sits between two fault lines in the San Francisco Bay.

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AGRA Foundations, Inc.

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  1. AGRA Foundations, Inc. Richmond/San Rafael Bridge HIGH CAPACITY MICROPILE CONSTRUCTION

  2. Photograph courtesy of California Department Transportation Richmond/San Rafael Bridge Completed in 1956, the 5.5 mile long bridge sits between two fault lines in the San Francisco Bay. The bridge connects the cities of Richmond and San Rafael as part of Interstate 580.

  3. Site Location Richmond/San Rafael Bridge San Francisco SAN ANDREAS FAULT HAYWARD FAULT

  4. Project Hierarchy Date bid: August 08, 1999 Owner: California Department of Transportation General Contractor: A Joint Venture of Tutor Saliba/Koch/Tidewater Prime Subcontractor: AGRA Foundations, Inc.

  5. AGRA’s Scope of Work 66” Dia. CIDH Piles 150” Dia. CIDH Piles Substructure Micropiles Superstructure Micropiles ``

  6. Substructure Micropiles Pile Data Micropiles This table represents 31 pier locations with 476 production piles and 5 performance piles. Load range from 290 kips to 1140 kips

  7. Substructure Micropile Note Spirals at base of pile and rings at Micropile top (inside the bell) Typical CRIP

  8. Prerequisites to Micropiles Work Platforms

  9. Hinge Locations Micropile Installation Templates Templates were constructed to accurately locate the micropiles

  10. Completed Templates and Conductor Casing Micropile Installation Templates Template Connector Templates in place on Bridge

  11. Foundation Bell Pipe Reinforcement Conductor Casing Steel Bell Casing 14” Dia. Cored Hole with Groves Rubber Seat Mud line Seal Coring Bed Rock Grooving Permanent Steel Casing Bedrock Socket Pipe placed from bottom of bell and socketted into bedrock (not shown) Bell 12” Dia. Micropile Installation

  12. Geological Description The Franciscan Formation is a heterogeneous unit of sedimentary and volcanic rock deposited in an offshore, deep-marine trough at the base of the continental slope. The formation consists of massive graywackesandstone, dark shale, minorchert and limestone, altered volcanic rock, and various metamorphic rocks. All of the rock is intruded by serpentine. The Franciscan Formation is believed to be as thick as 50,000 feet and typically found as fault-bound blocks accreted onto the western shoreline of California by plate movement .

  13. Bed Rock Topographic Contours

  14. Log of Test Bore Working Drawing Load Capacity Calculations

  15. Micropile Testing

  16. Micropile Testing

  17. Load Test Result Summary

  18. Construction Methods

  19. Visit us at www.agrafoundations.com or contact AGRA by email at afi@agrafoundations.com

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