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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CABRILLO BEACH GETS A WALK |
Originally, the design included three micropiles per bent. But due to budget constraints, August proposed that 2 anchor would work nearly as well, because the foot bridge itself provided the lateral support for the third micropile; the engineer concurred. The design provided for 40 foot micropiles battered at a 1 to 4. |
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Start of the drilling for the micropiles using a 6" diameter down-the-hole-hammer |
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Micropiles Support a Pedestrian Bridge The Los Angeles Department of Parks and Recreation wanted to build a pedestrian bridge nestled up against the beach cliffs of Cabrillo Beach near LA Harbor. The only problem was the difficulty of drilling and the unknown ground conditions of the beach, which was partially underlain by massive concrete block used to break the action of the surf.
August was contacted by Ross Cash of Cash & Associates to come up with some practical solution for foundation support. After much contemplation, mostly involving feasibility vs. cost, Ross Cash adopted Micropiles as the best all around solution. |
August was selected by John Meek Construction to install the micropiles. August used a Davey Kent 525 to drill through the rubble, dirt, sand and rock. To protect the micropiles from the elements, including storms scouring the beach, Cash included a 9 inch diameter and 20 foot long structural pipe at the surface. Below the sands, the anchor was socketed into the bedrock by the use of a 6" down–the-hole hammer. The epoxy coated Williams all-thread #14 bar tendon was installed into the cased hole and grouted. Within 24 hours, the anchors were also post-grouted to assure good bonding to the bedrock.. Every anchor was tested in tension to confirm proper bonding into the bedrock. The design load was 120 and the test load was 240 kips per micropile. Due to the angle, August devised a frame to accommodate the angle, and with the second anchor securing the beam, the testing went smoothly with every anchor passing. After the micropiles were completed, John Meek Construction, the general contractor, constructed the wood pedestrian bridge - which was supported on 3 foot diameter pile caps and the micropiles.
Ross Cash (far right) or Cash & Associates conducting the monitoring of the micropiles. |
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