| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a worker to perform the positioning and connection to a manhole aperture of a conduit properly and quickly even if he is not a specialist, and improve work efficiency and durability of connection of a mortar part. SOLUTION: This connection structure has an opening 16 for connection of a conduit 300 and a salient outer block part 20 surrounding this opening in generally U shape, at the sidewall 14b of the hollow box 12, and the salient outer block part has a coupling receiver 24 where an outer mortal molding box 22a having caught a conduit can be fixed to the outer surface of this salient outer block part and an inner mortal molding box 22b can be fixed to the inner side of the aperture. The term of construction can be shortened, and the work cost can be reduced by performing the temporary fixing of the conduit and the attachment of the molding box properly and quickly to the manhole.</p> |
