| 摘要 |
A synthetic resin tubular body is fitted into the pipe connecting hole of a handhole when used. The cut edge face at one open end side of the tubular body having square walls in cross section and circular walls in cross section which are alternately disposed in its axial direction is the boundary portion between a side wall portion forming the square wall in cross section and a peripheral wall portion forming the square wall in cross section, and is cut in the boundary portion on the side apart from the open end side or in the proximity thereof. The length of the tubular body is set greater than the wall thickness of the handhole. In addition to the tubular body, a block body for the tubular body is formed with square and circular recessed portions conforming to the outer peripheral face of the open end side portion of the tubular body. Further, a handhole is such that the cut edge face of the tubular body and the inner wall surface of the handhole are arranged substantially on the same plane, and the other end side portion of the tubular body being projected outside the handhole, and besides the tubular body or the block body is watertightly fixed by a curing filler such as cement mortar or gelation resin filled in the pipe connecting hole. |
