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

AGRA Foundations, Inc.
Richmond/San Rafael Bridge
HIGH CAPACITY MICROPILE
CONSTRUCTION
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
Site Location
Richmond/San Rafael Bridge
San Francisco
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.
AGRA’s Scope of Work
66” Dia. CIDH Piles
150” Dia. CIDH Piles
Substructure Micropiles
Superstructure Micropiles
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
Substructure Micropile
Note Spirals at
base of pile
and rings at
Micropile top
(inside the
bell)
Typical
CRIP
Prerequisites to Micropiles
Work Platforms
Micropile Installation Templates
Templates were constructed to accurately locate the micropiles
Hinge Locations
Micropile Installation Templates
Template
Connector
Completed Templates and
Conductor Casing
Templates in
place on Bridge
Micropile Installation
Foundation Bell
Pipe Reinforcement
Conductor Casing
Steel Bell Casing
14” Dia. Cored Hole
Rubber Seat
with Groves
Mud line
Seal
Coring
Bed Rock
Permanent
Steel Casing
Grooving
Bedrock Socket
Pipe placed from
Bell
bottom of bell and
socketted into bedrock
(not shown)
12” Dia.
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 .
Bed Rock Topographic Contours
Log of Test Bore
Working Drawing Load
Capacity Calculations
Micropile Testing
Micropile Testing
Load Test Result Summary
Construction Methods
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