Rehabilitating underground pipes with expanding helically wound liner
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United States of America Patent
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Apr 7, 1992
Grant Date -
N/A
app pub date -
Dec 18, 1990
filing date -
May 2, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of rehabilitating underground pipes which comprises the steps of: (a) forming a liner pipe (5) by winding a strip (4) made of a synthetic resin into a helical shape so that the side edges of the convolutions of the wound strip (4) are interengaged with each other; (b) continuously introducing the liner pipe (5) into an underground pipe (1) while the liner pipe (5) is being advanced inside the underground pipe (1); inserting a slip restraining member in the form of a wire rod (6) continuously to the interconnected edges of the convolutions of the said strip (4), and then removing the said strip (4) when the diameter of said liner pipe (5) is to be increased at the same rate as said strip (4) for forming said helical liner pipe (5) is conveyed.
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