A method for everting a tubular liner bag.

摘要

A method for everting a tubular liner bag (1) into a pipe (10) to line the pipe with the tubular liner bag, comprising the steps of: (a) attaching an air hose end to a suitable position of the outer surface (before everting) of the liner bag; (b) everting the tubular liner bag by means of water pressure into a vertical entrance to the pipe; (c) turning the head of the tubular liner bag toward a pipe entrance, when the eversion head hits upon the inner wall of the pipe; (d) everting the tubular liner bag substantially deep into the pipe; (e) stopping the eversion; (f) deforming the everted tubular liner bag such that it is roughly shaped like a letter J with the head portion of the tubular liner bag corresponding to the toe of the J-letter, and such that when compressed air of a pressure not substantially greater than the pressure required to force the tubular liner bag to evert exists in the toe section of the J-letter shaped tubular liner bag, the air does not get to the long-leg section of the J-letter shaped bag from the toe section; and (g) operating an air compressor (7) to supply compressed air into the head portion of the tubular liner bag by way of the air hose (8) to thereby increase the internal pressure in the head portion of the tubular liner to values substantially greater than that required to force the tubular liner bag to evert. <IMAGE>