| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary press-driving pile device which exerts a consolidation effect to the periphery of a pile, and is excellent in excavation efficiency. SOLUTION: A flange-shaped enlarged-base board 12 has apertures 13 formed therein which are almost in parallel with a diameter-directional segment S of a tip 3 and located on a rotating directional side. The enlarged-base board has upper blades 14 extending upward in a direction opposite to a rotating direction, at the edge 13A of the aperture 13, on the rotating directional side, and lower blades 15 extending downward in the rotating direction, at the edge 13B of the aperture 13, on a side opposite to the rotating directional side. Since the aperture 13 is almost in parallel with the diameter directional segment S and located on the rotating directional side, the upper blade 14 and the lower blade 15 are located on the rotating directional side. Therefore when the tip 3 is rotated, the upper blade 14 and the lower blade 15 press earth on the front side of a diameter location, and a pressing force generates a force to press the earth in an outer peripheral direction, to thereby improve the consolidation effect on the periphery of the pile. COPYRIGHT: (C)2005,JPO&NCIPI
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