Method for water leakage prevention in pipeline and liner for water leakage prevention
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United States of America Patent
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Mar 17, 1992
Grant Date -
N/A
app pub date -
Aug 13, 1990
filing date -
Aug 15, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for preventing water leakage into and out from a pipeline utilizes an injection material and a liner. The injection material exhibits fluidity and hardenability. The liner includes an elastically deformable sleeve having an outer diameter smaller than the inner diameter of the pipe and a plurality of elastically deformable and successively circumferentially extending projection portions formed at axial intervals on the circumferential surface of the sleeve; a sheetlike base placed inside the sleeve in a radially expandable, wound cylindrical form; fixing means for maintaining the base in a substantially cylindrical form when the base is radially expanded inside the sleeve; and check valve means defined by the sleeve and the base when the base is radially expanded. The check valve means permits the injection material to flow from the inside of the base into the space between the projection portions in the axial direction.
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