COMPOSITE PILE, AND CONSTRUCTION METHOD FOR COMPOSITE PILE

摘要

PROBLEM TO BE SOLVED: To provide a composite pile which maintains bearing capacity to a structure in a large scale earthquake and prevents a soil cement column from being damaged.

SOLUTION: A composite pile 1 has a soil cement column 10 formed in a bed G1 of a surface layer of a subsoil and a pile 11 vertically penetrating in the soil cement column 10 and projecting downward from the bottom face of the soil cement column 10. An outer peripheral surface of a part 11a through which the soil cement column 10 of the pile 11 penetrates is formed to be a smooth shape without projection part for increasing frictional resistance force between the pile 11 and the soil cement column 10. A spiral blade 20 for increasing resistance force against the subsoil is formed at the tip of a part 11b projecting from the bottom face of the soil cement column 10 of the pile 11, and the spiral blade 20 penetrates to a bed G2 which is deeper and harder than the bed G1.

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