1810.7.9 Caisson Piles in Soil

Caisson piles as described in Sections 1810.7 may be installed in soil provided that the socket is formed entirely in soil of class 4 or better and the concrete is placed under pressure exceeding 1.5 times the existing total overburden pressure. The socket shall be formed by extending the casing to the bottom of the socket and withdrawing the casing while the concrete is being pumped under pressure. Piles shall be installed in accordance with the provisions of Section 1810.3 and 1810.7. For diameters less than 12 inches (305 mm), the casing above the socket shall remain in place permanently. Reinforcing to the socket shall be placed in the casing to the depth of the socket prior to placing concrete.