| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an excellent workability and an excellent corrosion resistant property, and to prevent the water leaking and the like for a long period. SOLUTION: When a branch pipe 5 is connected to a drainage pipe main pipe 1 in which a thermal hardening resin layer is lined on the inner surface, a hole is formed to the thermal hardening resin layer 2 of a branch part 3, and after that, an inner tube body 10 which consists of an elastic material, and has a flange 11 for close contact at one end, is installed by positioning to contact closely the flange 11 on the inner peripheral surface of the drainage pipe main pipe 1, and then, the branch pipe 5 is connected to the drainage pipe main pipe 1 in the condition housing the inner tube body 10.</p> |
