Drilled shafts (caissons or drilled piers) are typically high axial and lateral load deep foundation systems. A cylindrical shaft is excavated, reinforcing steel is placed in the excavation and concrete is placed to form the shaft. An example (see photo to right) Berkel installed 60-in diameter shafts at the Devon Energy HQ project in Oklahoma City OK; some more than 136 ft deep with a reinforcing cage 120-ft in length (weighing over 31,000 pounds).

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