Method for everting a tubular liner bag

Details Method for everting a tubular liner bag Method for everting a tubular liner bag

1994-03-11

1996-01-23

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

16287, 16294, 264 36, 264269, B29C 6336, B29L 2322

Patent

active

054863325

ABSTRACT:
A tubular liner bag is everted into a pipe to line the same, by first attaching an air hose end to the uneverted liner bag and then everting the tubular liner bag by water pressure provided into the manhole to the pipe. The head of the tubular liner bag is turned toward the pipe entrance when the head of the liner bag hits the inner wall of the pipe, and the tubular liner bag is everted into the pipe. The eversion is then stopped and the everted tubular liner bag is deformed to a J-shape with its head portion corresponding to the toe of the J-shape. Compressed air at a pressure not substantially greater than the pressure required to force the tubular liner bag to evert then exists in the toe section of the tubular liner bag but does not exist in the long-leg section. The air compressor is used to supply compressed air into the head portion of the tubular liner bag via the air hose to increase the internal pressure in the head portion of the tubular liner to a value substantially greater than a required to force the tubular liner bag to evert.

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