Drilled Shafts, or caissons, are cast-in-place elements that resist compressive, uplift, and lateral loads.

Technical Details

A hole for the planned shaft is first drilled to the design depth. Sometimes, a drilled hole requires additional support from casing or drilling fluid to remain open. Then, full-length reinforcing steel is inserted into the hole and filled with concrete.

Our Experience

Our drilled shaft resume includes many complex and challenging projects all across the United States. In Chicago, we constructed 10 foot diameter, 115 feet deep drilled shafts to support the Sears Tower, one of the world’s tallest buildings. In Lake of the Ozarks, Missouri, a 2,700 foot bridge is founded on 9 foot diameter shafts drilled through up to 100 feet of water. And in central Arizona, drilled shafts extend 100 feet below scour level support mile-long, twin road bridges running in the Salt River Channel. In the Northeast, our work is typically on very large and/or complex projects. Construction of 225 drilled shafts for the Secaucus Rail Station, New Jersey, included the drilled shaft foundations for the four office buildings built over the air rights of the station and the Amtrak Acela tracks. In Boston, we constructed over 600 drilled shafts up to 150 feet deep for the "Keystone" contract on The Central Artery "Big Dig." Our Northeast work also included the construction of approximately 1,000 drilled shafts for 15 stations and four bridges on the New Jersey Light Rail Line between Camden and Trenton.

In Charleston, Case Atlantic installed the foundation for the internationally renowned Cooper River Bridge, which comprises ten-foot diameter shafts to depths exceeding two hundred feet. In Tampa, drilled shafts by Case Atlantic support most of the downtown high-rise structures, and cement plants in South Carolina owned by Giant Cement and LaFarge USA include cement silos and other structures founded on drilled shafts.