| 摘要 |
PROBLEM TO BE SOLVED: To provide a casing connecting structure being easy to connect and remove without requiring a welding facility or the like, and being reusable after removal. SOLUTION: In a casing connecting structure for connecting a plurality of cylindrical casings together in the direction of their axis O and inserting them into a drillhole drilled by a drilling tool, a pair of interconnected casings 1A, 1B are so formed that the connecting end 2 of the one casing 1A can be fitted into the connecting end 3 of the other casing 1B. Grooves 4, 7 opposing each other while the connecting ends 2, 3 are fitted together are formed in the opposite inner and outer peripheral surfaces 2a, 3a of the connecting ends 2, 3 in such a way as to extend in the circumferential direction of the inner and outer peripheral surfaces 2a, 3a. A connecting member 10 comprising a coil spring and a wire rope inserted therein is inserted along the circumferential direction of the inner and outer peripheral surfaces 2a, 3a into a hole 9 defined by the opposite grooves 4, 7.
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