| 摘要 |
PROBLEM TO BE SOLVED: To certainly connect piles to each other in a fall-stopping state while reducing working cost smaller without taking much trouble for connecting work. SOLUTION: A cylinder part 1 is provided on one pile end part, a shaft part 2 is provided on the other pile end part, an inward groove part 5 along a peripheral direction is formed on a cylinder part inner peripheral surface 1a of the cylinder part 1, and an outward groove part 6 along a peripheral direction is formed on a shaft part outer peripheral surface part 2a of the shaft part 2 so as to face against the inward groove part 5. Thereafter, the cylinder part 1 and the shaft part 2 of adjoining piles A fitted on each other are made free to be connected to each other by providing a first screw part 19 to be screwed and fitted in a through hole 16 on one of them, providing a second screw part 20 to be screwed and fitted on a divided key member 12 on the other and fitting the divided key member 12 in a state of straddling in the inward groove part 5 and in the outward groove part 6 by a key operating member S forming the first screw part 19 and the second screw part 20 inverse helical.
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