| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of rotatively burying a pile with a spiral protrusion made of concrete, which reduces excavated and removed soil, which needs only small rotational torque when the pile is rotatively buried, and which hardly causes the misalignment and bend (clearance) of the pile. SOLUTION: Characteristically, after a hole is excavated in ground 3 in such a manner as to have a smaller diameter equivalent to 70% or more of an outer peripheral diameter of a main body of the pile 5 and smaller than an outer peripheral diameter of the spiral protrusion 5a, an enlarged excavated hole 4b is formed at the leading end of the small-diameter excavated hole 4a; a curing body material is infilled into the enlarged excavated hole 4b; subsequently, a prescribed position ranging the excavated hole 4b to the surface of the ground 3 is pulled up and excavated in such a manner as to have a diameter larger than the outer peripheral diameter of the spiral protrusion 5a; and the pile 5 is rotatively buried in the excavated hole 4, so that the spiral protrusion 5a can be anchored into the excavated hole 4b. COPYRIGHT: (C)2006,JPO&NCIPI
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