| 摘要 |
PROBLEM TO BE SOLVED: To efficiently fasten a bolt for preventing an internal cylinder body from getting loose to enhance workability. SOLUTION: Respective front ends of the upper arm part 61 of a movable member 6 and a sliding part 62 are inserted in respective upper opening 51 of a receiving part 5 and a lower opening 52, in the case body for an underground structure 1. The upper face of the sliding part 62 is exposed at the lower face of a fitting seat 53. A bolt 10 is inserted in the insertion hole 611 of the upper arm part 61, the through hole 531 of a fitting seat 53 and the loose insertion hole 621 of the sliding part 62, and the front end of the bolt 10 is screwed in a nut 15 of a nut housing chamber 64 to set the movable member 6 to the receiving part 5. When the bolt 10 is fastened in this state, respective front ends of the upper arm part 61 and the sliding part 62 are extruded outward and brought into contact with the inner peripheral face of the outer cylindrical body 2 to prevent the inner cylindrical body 3 from getting loose.
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