| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel pipe pile with a recess and a composite steel pipe pile using the steel pipe pile capable of developing a large bearing force by increasing a frictional force between the peripheral surface of the steel pipe pile buried in the ground, concrete, cement or soil cement, and the ground, the concrete or the like. SOLUTION: The steel pipe pile has a recess in the peripheral direction of the steel pipe. Provided that the wall thickness of the steel pipe is 2 mm or larger, the outer diameter (D) of the steel pipe is 50 mm or larger, the depth of the recess is 0.005D to 0.2D and the width of the recess is 0.015D to 2D, and that (B) represents the width of the recess and (H) represents the depth of the recess, (1) when the cross sectional shape of the recess is triangular, B/H is 3 to 20, (2) when the cross sectional shape of the recess is quadrangular, B/H is 4 to 20, and (3) when the cross sectional shape of the recess is semi-circular or trapezoidal, B/H is 3 to 20. COPYRIGHT: (C)2008,JPO&INPIT
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