| 摘要 |
PROBLEM TO BE SOLVED: To provide an erection method for a reinforcement cage for a cast-in-place pile, which enables the early start of placing of freshly-mixed concrete by increasing the speed of a reinforcement cage adding operation. SOLUTION: A hole at the stage before the formation of the placing hole 3b is drilled as a reinforcement cage adding operation hole 3a in one of the predetermined areas of the drilling of the placing hole. The two reinforcement cages 30 are added in the reinforcement cage adding operation hole 3a, and turned into an extension reinforcement cage 31. After the extension reinforcement cage 31 is inserted into the placing hole 3b, another extension reinforcement cage 31 is added to the extension reinforcement cage 31, so as to bring about an extension reinforcement cage 32 with a length equivalent to the total of the lengths of the extension reinforcement cage 31. After the extension reinforcement cage 32 is erected in the placing hole 3b, the freshly-mixed concrete 43 is placed for the formation of the cast-in-place pile 8. After the completion of the reinforcement cage adding operation in the area, the dead reinforcement cage adding operation hole 3a is further drilled down to serve as the placing hole 3b. COPYRIGHT: (C)2009,JPO&INPIT
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