| 摘要 |
<p>PROBLEM TO BE SOLVED: To guide all the flow passing through a sub-lateral pipe section and a bent pipe from an erect main pipe to the downstream direction of a lateral main pipe and prevent the blocking caused by the drain in the lateral main pipe by forming a branch pipe section diagonally merged to the downstream direction of the lateral main pipe while securing a sufficient straight line length. SOLUTION: A part of a lateral main pipe 1 is constituted of a Y-pipe 2, and a bend pipe section 6 and a sub-lateral pipe section 7 are provided between the branch pipe section 3 of the Y-pipe 2 and the lower end section of an erect main pipe 5. The branch pipe section 3 has no bent portion and has a sufficient straight line length. An opening region A where the branch pipe section 3 is communicated with a main pipe section 10 is located on the downstream side of the sub-lateral pipe section 7. The flow in the sub-lateral pipe section 7 passes through the bent pipe section 6, and all the flow is bent to the downstream direction of the lateral main pipe 1. The drain flowing into the main pipe section 10 from the branch pipe section 3 smoothly merges with the flow in the lateral main pipe 1 regardless of the strength of the force of water, and the blocking caused by the drain in the lateral main pipe 1 is prevented.</p> |
