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

2. 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.
Photograph courtesy of California Department Transportation

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

4. Project Hierarchy August 08, 1999
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. Substructure Micropiles Superstructure Micropiles
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. Micropile Installation Templates
Templates were constructed to accurately locate the micropiles
Hinge Locations

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

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

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 graywacke sandstone, dark shale, minor chert 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. Working Drawing Load Capacity Calculations
Log of Test Bore
Working Drawing Load Capacity Calculations

15. Micropile Testing

16. Micropile Testing

18. Load Test Result Summary

19. Construction Methods

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