| 摘要 |
A turned-over or inverted section is formed at one end of a flexible, fluid impervious tube by turning the tube inside out and folding it back up on itself. With the turned-over end inserted in a pipe or conduit, the folded over end is secured to the pipe and then a fluid differential is created between the inside of the tube in the pipe and the inside of the pipe ahead of the tube which differential is great enough to cause the turned-over end of the tube to migrate along the pipe from one end to the other by drawing the tube into the pipe from the end which is not attached to the pipe. In this manner, a flexible tube can be installed in a pipe irrespective of the complex configuration into which the pipe is bent or the variations in cross-sectional shape which may exist along the length of the pipe. The disclosure also includes an apparatus providing a pipe engaging means for forming the inverted end of the tube and sealing it to the end of the pipe. The apparatus also included a chamber for pressurized fluid in which a quantity of the collapsed tube is stored in a manner to be progressively released as the tube is inserted in the pipe.
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