CALTRANS is widening and redeveloping the 5/805 interchange in San Diego, and contracted Yeager Skanska Construction (YSC) to lead the project. YSC subsequently subcontracted the installation of the drilled shafts to Condon-Johnson & Associates (CJA).

The Challenge
A tremendous amount of planning and coordination was required to fulfill this contract successfully, as the site was adjacent to active traffic lanes of these busy freeways.

The Solution
The $ 15 million project which involved installing 152 shafts varying from 1.5-3.8 meters in diameter up to depths of 55 meters was performed utilizing IMT AF-300s, Soil Mec 825s, and Taurus XLs .

Reinforcing steel cages up to 77,300 kg were hoisted utilizing six point picks and multiple cranes. Concrete pours, some lasting eight hours, were staged to maintain continuity of placement. Concrete was placed by tremie pump methods as well as free fall.

In addition to the large diameter shafts, 134 shafts measuring 610 millimeter were installed.

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Drilled Shafts