Tokyo Gas Company Limited

Ashimori Industry Co., Ltd.

Hakko Co., Ltd.

Takashi Kamuro

Isao Saito

Motoyuki Koga

Takeshi Nakamura

Hisao Ohtsuga

Hiroshi Kimura

Hisao Ootsuga

A method for repairing pipes laid underground, such as gas pipes, consisting of a main supply pipe from which numerous distribution pipes branch off to supply the individual users, the method using resin to repair the main supply pipe and the distribution pipes from the inside while in their buried state. The repair method of this invention is characterized by the fact that, having repaired the main supply pipe and the distribution pipe in successive operations, whether the repairs to the main supply pipe and the distribution pipes have been done properly or not can be confirmed on completion of the repairs by carrying out sealage tests on the distribution pipes and the main supply pipe.

Method of repairing pipes laid underground

A method and apparatus for providing the inner surface of a pipe line with a tubular lining material through a binder under fluid pressure which comprises introducing the lining material in flattened state containing a binder in the interior space thereof into a pressure container, annularly fixing the front end of the tubular lining material to the container and applying fluid pressure to the pressure container to push the lining material forward within the pipe line while effecting evagination of the lining material and at the same time bonding the evaginated lining material onto the inner surface of the pipe line, characterized in that the introduction of the lining material into the pressure container is performed by squeezing the flattened tubular lining material at definite intervals linearly in the transverse direction to the advancing tubular lining material under atmospheric pressure to isolate the portion of the lining material together with the binder contained therein between the adjacent two linearly squeezed positions, allowing the lining material to advance into the pressure container while keeping the lining material squeezed linearly in the transverse direction at definite intervals, and releasing the lining material from squeezing in the pressure container under fluid pressure. The use of a specific sealing device allows for the conveyance of a sufficient amount of the binder into the pressure container without being pushed back so that bonding of the evaginated lining material onto the inner surface of the pipe line can be effected satisfactorily.

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

Growing community of inventors

Kawasaki, Japan

Takashi Kamuro