| 摘要 |
<p>The invention provides that a rigid plastics material (preferably p.v.c.) pipe (10) is provided with folds and is introduced into a pipeline or passageway and heat is applied to the pipe to soften same. The hot pipe is unfolded and using fluid pressure, is expanded onto the pipeline or passageway surface to line same. When the pipe cools or is cooled, it remains in position on said surface. The pipe is folded into petal or star shape in cross section, and it may be twisted for even bending and/or it may be everted into the pipeline or passageway. Several methods of insertion are disclosed.</p> |
