| 摘要 |
A method is disclosed for forming a substantially flush joint or coupling between two profile wall thermoplastic pipes. The method comprises removing substantially all of the helical rib and inner wall of a first pipe for a distance from an end of the first pipe and removing a portion of the helical rib for a distance from an end of a second pipe. By so doing, the outer wall of the second pipe can be deflected radially inward and the end of the second pipe can thereby be coupled with the first pipe by overlapping the outer walls adjacent the ends of the first and secon d pipes, with the outer wall of the first pipe being on the exterior. When overlapped, the second walls o f both the pipes can then be fused together. Alternatively, the outer wall of the first pipe can be removed rather than the inner wall, and the inner wall of the second pipe deflected radially outward such that the inner wall of the second pipe can be positioned around the inner wall of the first pipe and fused thereto. Finally, the above configurations could alternatively be preformed on the pipes without requiring removal of any material.
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