| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary buried pile easy in rotary burying work, and having large ground bearing power. SOLUTION: This rotary buried pile has an expanded bottom plate fixed to a buried tip part of a pile body, extending outward in the radial direction to the pile body, having the front edge and the rear edge when viewed in the rotational direction of the pile body and having an opening defined between the front edge and the rear edge, a lower blade for moving to an upper surface of the expanded bottom plate via the opening by cutting sediment of an under surface of the expanded bottom plate when rotating the pile body by projecting downward from the front edge of the expanded bottom plate, and an upper blade for substantially blocking up the opening when viewed in the shaft direction of the pile body by projecting upward from the rear edge of the expanded bottom plate. The expanded bottom plate is spirally installed on an outer peripheral cylindrical surface of the pile body by twisting or inclining in a spiral screw shape at a predetermined inclination of 3 degrees to 20 degrees to the axis of the pile body. At least two excavation blades mutually separate in the radial direction, are arranged on a shaft directional tip surface of a tip part directly or via a conical installation stage. COPYRIGHT: (C)2006,JPO&NCIPI
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