| 摘要 |
PROBLEM TO BE SOLVED: To firmly integrate cylindrical body unit bodies with each other and to certainly prevent side slipping of a cylindrical body even when it receives strong pressure from the side. SOLUTION: A cylindrical body 3 for an underground structure has cylindrical body unit bodies 32, 33 vertically accumulated through adhesives and a ring 4 for connection to be provided to straddle over a connecting part 3b of the upper and lower cylindrical body unit bodies, and the ring 4 for connection is constituted by providing gusset type projections 41, 42, 43, 44 as projected lines (projected parts) having flexibility on a ring main body 40. Thereby, the wrinkle type projections 41, 42, 43, 44 make contact with wall surfaces 32a, 33a of the cylindrical body unit bodies 32, 33 in a state where the ring 4 for connection is provided to straddle over the connecting part 3b of the cylindrical body unit bodies 32, 33.
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