Tokyo Gas Company Limited

Ashimori Industry Co., Ltd.

Ashimori Kogyo Kabushiki Kaisha

Tokyo Gas Kabushiki Kaisha

Masao Hirayama

Akio Morinaga

Katsuaki Zenbayashi

Akira Morita

A method and apparatus for causing a flexible tubular lining material to be fixed to the inner surface of a pipe line wherein the tubular lining material is initially attached to the inner surface of the pipe line by a binder provided on the surface of the tubular lining material which comprises providing a flexible hose material having a porous structure inside the pipe line which has been lined with the tubular lining material and introducing a heated gaseous fluid stream into the interior of the flexible hose whereby the heated gaseous fluid stream is introduced through the pores of the flexible hose along the inner surface of the lined pipe line, the flexible tubular lining material being warmed to accelerate the curing of the binder interposed between the inner surface of the pipe line and the flexible lining material.

Method and apparatus for providing the inner surface of a pipe line with

A method for smoothly evaginating a tubular material under pressure, if necessary, within a pipe line with simultaneous bonding the evaginated tubular material onto the inner surface of the pipe line, which comprises placing in a pressure container having a discharge pipe a part or whole of a tubular material, if necessary, with one terminal end thereof being connected to a first like material rope having a length at least equal to that of the tubular material, if necessary forming a reservoir of a binder enclosed in the interior of the tubular material placed in the pressure container to apply the binder onto the inner surface of the tubular material, fixing the other open terminal end in evaginated state to an annular fastener of said discharge pipe, and applying a pressurized fluid to the pressure container to evaginate the tubular material over its full length as it is propelled from the discharge pipe and, if necessary, moved forward within the pipe line and at the same time bonding the evaginated tubular material onto the inner surface of the pipe line with the binder being interposed therebetween, characterized in that a second rope-like material previously passed through said tubular lining material beyond its full length is drawn out while applying said pressurized fluid. This method is effective for overcoming drawbacks seen in the conventional methods for evaginating tubular materials and is advantageously utilized for the lining treatment of extremely long pipe lines or pipe lines with a number of curved portions without damaging the apparatus and/or lining materials and narrowing the flow path.

Method for smoothly evaginating a tubular material under pressure

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Settsu, Japan

Masao Hirayama