PROJECT NAME: CYPRESS AVE BRIDGE, REDDING CA

GENERAL CONTRACTOR: KIEWIT PACIFIC CO

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.