Drilled shafts are deep foundation elements that are high capacity and cast-in-place.

Common Uses

  • Support structures
  • Provide earth retention

Technical Details

Drilled shafts (also referred to as caissons) are constructed by first drilling a hole with the design diameter to the design depth. If the hole cannot remain open on its own (due to sloughing or caving soils and/or ground water), drilling fluid or casing is used to help. After drilling is complete, a reinforcing steel cage is lowered into the hole and filled with concrete. Under certain conditions, the base of a drilled pile can be enlarged to form a bell and provide increased area for end bearing.