| 摘要 |
PURPOSE: To provide a method of and device for installing plastic service pipes into existing steel service pipes. CONSTITUTION: A corrugated plastic service pipe 20 is inserted, together with a flexible guide assembly 22, through an accessible end of a steel service pipe 14, 10 that extends to a main. The flexible guide assembly 22 comprises a flexible guide element 24 and a flexible spring guide 26. The guide element 24 extends through a nosepiece 32 having an outer part 34 secured to the pipe 20 and an inner part 36. The spring guide 26 carries at its tip a sensor that emits a signal upon entering the main. When the pipe 20 is correctly positioned, fluid sealant is injected into the space between the pipe 20 and the pipe 14, 10. When the sealant has solidified sufficiently, the guide assembly 22 is withdrawn through the pipe 20 with the inner part 36 separated from the outer part 34 to allow withdrawal of the spring guide 26. |
