| 摘要 |
<p>PURPOSE:To prevent deposition itself of a riser pipe and prevent certainly a branch pipe and/or a main pipe from breakage in an arrangement in which the riser pipe laid plumb substantially is connected with the main pipe through the branch pipe by covering the riser pipe with a soft sheath. CONSTITUTION:Underground burying structure 10 of a sewer pipe includes a main pipe 12, and to its over-part a branch pipe 16 is connected through a saddle 14. The branch pipe 16 has a rubber loop receptacle 18, with which the top of a riser pipe 22 is connected which has at the top a rubber loop receptacle 20 and is laid plumb substantially, and a sewage basin is connected with this receptacle 20 through a bend 30 and a holddown pipe 32. The riser pipe 22 is covered with a sheath 24 which is soft and has a small friction resistance with the riser pipe 22 made from polyethylene sheet etc. Even though the back- fill soil 38 is compacted and deposited after execution of the work, only the sheath 24 deposits associate with the compaction and deposition of the soil and sand 38 owing to existence of the sheath 24, and the riser pipe 22 is precluded from sinking.</p> |
