| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the operation of pulling out an existing pile greatly involves risk because heavy machinery tends to fall due to a drilled hole and soft ground. SOLUTION: A reinforcing cuboid box A and a wedge-shaped box B are arranged in the drilled hole. Since this prevents a collapse of the drilled hole and decentralizes pressure generated by the gravity of the heavy machinery, safe and rapid operations can be performed. COPYRIGHT: (C)2009,JPO&INPIT
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