the tougher the job, the
more we shine
August Construction
(310) 719-7103
fax... (310) 719-1024
contact:
Agust
Agustsson
agust@geosupport.com
©1999-2007 Agust
Agustsson
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UCLA PARKING STRUCTURE #32 gets an earthquake upgrade and underpinning, all using MICROPILES |
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| The challenge for August
Construction and West Valley Investment, the General Contractor, was to
install an underpinning system that could carry the loads of the three
story parking structure, and meet the stringent engineering requirements
imposed on a school structure. The solution presented itself when
Micropiles became the preferred choice over the pre-designed 24"
diameter PILES. Since the micropiles were designed to take the
loading, it simply became the challenge to adopt them to the underpinning
system. The low overhead drill was used inside the structure for the 50
micropiles, which were 8" diameter and 40 foot deep. The
tendons, provided by Williams Form Engineering, utilized a 1 3/8"
all-thread tendons for the 40 foot depth, grout and post grout lines with
valves. During grouting the water table was a significant problem in
keeping the post grouting (which can utilize up to 1000 psi) confined to
the hole- it wanted to migrate along the water table. August
modified location of the post-grout valves and was able to achieved 400
psi pressures, which was sufficient to provide very good anchors for the
required loads. Three anchors were tested in tension to verify
loading values.
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