Pipe joints or couplings – Connector for conduit housing electromagnetic line: – Having box and connector
Patent
1991-07-29
1993-07-06
Nicholson, Eric K.
Pipe joints or couplings
Connector for conduit housing electromagnetic line:
Having box and connector
285162, 285214, 138 98, 29890148, 405157, F16L 4108
Patent
active
052247422
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for water cut-off in a portion connecting a first pipeline to a second pipeline which branches off from the first pipeline, a structure of the connection portion for water cut-off, and a cut-off material.
BACKGROUND ART
A first pipeline, such as a main sewer pipe, is generally bonded in a liquid tight manner to a second pipeline, such as a branch pipe, at a portion connecting the two pipelines by means of a bonding agent such as mortar. In general, the bonding agent may be removed from the first or second pipelines by only slightly relatively displacing the pipelines. As a result, a space is formed in the connection portion, and the liquid tightness of the connection portion is lowered. A cut-off treatment is performed to prevent water leakage from the space formed in the connection portion.
This water cut-off is generally accomplished by a chemical feeding method involving the injection of a cut-off agent of cement or liquid type into the space and around the connection portion followed by coagulation of the cut-off agent.
When water leakage occurs in practice, the cut-off agent is diluted with water, flows into the pipeline and frequently fails to harden. Consequently, subsequent treatment for removing the cut-off agent that has entered the pipeline should also be conducted.
In the chemical feeding method using a cement-type cut-off agent, the hardened cut-off agent does not exhibit elasticity. When the pipes are displaced due to vibration, land subsidence or the like, the hardened cut-off agent peels from the pipeline, and cracks form in the hardened cut-off agent. As a result, long-term, stable water cut-off is not expected In the chemical feeding method using a liquid-type cut-off agent, the mechanical strength of the cut-off agent is low. The water cut-off is therefore not stably maintained for a long period of time.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a cut-off method for a connection portion that does not employ a cut-off agent, a structure of the connection portion in the pipeline and a cut-off material.
According to the present invention, a method for water cut-off for a portion connecting a first pipeline to a second pipeline which branches off from the first pipeline includes the steps of: disposing an impermeable cut-off member having an expandable hose portion and a flange portion formed integrally with one end of the hose portion in the first and second pipelines, so that the flange portion is positioned within the first pipeline and the hose portion is positioned within the second pipeline; and maintaining the cut-off member so that the flange portion is brought into liquid tight contact with the inner surface of the first pipeline, and the hose portion extends within the second pipeline.
A structure of a portion connecting a first pipeline to a second pipeline which branches off from the first pipeline according to the present invention includes an impermeable cut-off member having an expandable hose portion and a flange portion formed integrally with one end of the hose portion. The flange portion is brought into liquid tight contact with the inner surface of the first pipeline, and the hose portion is disposed to extend within the second pipeline.
A cut-off material used for water cut-off for a portion connecting a first pipeline to a second pipeline which branches off from the first pipeline according to the present invention includes an impermeable cut-off member provided with an expandable hose portion and a flange portion formed integrally with one end of the hose portion.
The cut-off member is disposed from the inside of the first pipeline or from the upper end of the second pipeline, so that the flange portion is positioned within the first pipeline and the hose portion extends within the second pipeline. The liquid tightness between the flange portion and the first pipeline is maintained by bringing the flange portion into liquid tight contact with the inner surface of the first pipelin
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Supplementary European Search Report for EP 91 90 3820, May 25, 1992.
Kitajima Hisashi
Noda Hidehiro
Ooka Sinkiti
Suzuki Yukio
Kabushiki Kaisha Iseki Kaihatsu Koki
Nicholson Eric K.
Toa Grout Kogyo Kabushiki Kaisha
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