| Cypress Ave Bridge, Redding,
CA
In March of 2007, Malcolm Drilling Co. Inc. was contracted
to perform the drilled shaft work for a bridge replacement
over the Sacramento River in Redding, CA. In total 28
shafts with 8 ft. diameter and up to a 92 ft. depth
were required. Due to large cobbles and boulders with
diameters up to 2 ft., the installation of a temporary
casing was the only viable option. Malcolm Drilling
Co. Inc. employed one of its large oscillator machines
to install heavy duty Leffer casing for the full shaft
depth. Near the river banks, work was performed from
rock pads while most of the shafts were installed from
a temporary steel trestle. In addition to concrete integrity
testing of each shaft, one full-scale load test was
performed ahead of construction using the Osterberg
Load test method. Exceptionally good test results enabled
the reduction of individual shaft lengths which resulted
in overall cost savings for the entire project.
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