| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile construction method which brings about the effective utilization of a material by enabling the recycling of a drilling tube with a drill bit. SOLUTION: A drilling member 21 fitted with the bit 21c is detachably attached to a lower end of a pipelike casing 20; the casing 20 is built in an excavator 16, and lowered while being rotated; a ring ditch 22 is formed in ground; after that, the casing 20 and the drilling tube 21 are pulled up by a crane 14; the drilling tube 21 is detached from the casing 20; subsequently; a main pile 23 is attached to a lower end of the casing 20; the excavator 16 makes the casing 20 lowered while being rotated; and the casing 20 is separated from the main pile 23 after the insertion of the main pile 23 into the ring ditch 22, and pulled up by the crane 14 in such a manner as to leave the main pile 23 behind. COPYRIGHT: (C)2009,JPO&INPIT
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