| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe mounting wall capable of saving labor in drilling holes of a flow-in pipe passage and a flow-out pipe passage opened on a peripheral wall to reduce cost and reducing its weight. SOLUTION: This pipe mounting wall 1 constitutes a bottom part of a manhole. The vertical longitudinal hole 6 is drilled at the center on the pipe mounting wall 1. A bottom part 7 of the longitudinal hole 6 has a spherical face plate shape, and a flow-out pipe mounting hole 8 is drilled continuously with at least a lowest part 7' of the bottom part 7 on the peripheral wall 1'.
|
