| 摘要 |
PROBLEM TO BE SOLVED: To provide a work execution method for a cast-in-place steel pipe concrete pile by an all-casing construction method that can reduce cost and save resources by minimizing the quantity of excavated soil and the quantity of concrete in a casing. SOLUTION: In executing a cast-in-place steel pipe concrete pile by the all- casing construction method, an outer casing 2 larger in diameter than a steel pipe 1 constituting the cast-in-place steel pipe concrete pile is installed in a required deeper position than the lower end of a steel pipe installation position 1a, and the interior of the outer casing 2 is excavated at least to the lower end of the steel pipe installation position 1a. An inner casing 3 of almost the same diameter as the steel pipe 1 is then pressed in, and after the interior of the inner casing 3 is excavated to insert a reinforcing cage in the excavated interior of the inner casing 3, concrete C is placed. When the upper face of the placed concrete C is positioned at a bottom part 9 of an excavated part 8 of the outer casing 2 or higher, the inner casing 3 is pulled out to dispose a steel pipe 1 in an installation position. Concrete C is then placed up to the final height, and the outer casing 2 is pulled out.
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