Method and device for preparing an existing buried conduit for replacement by a new conduit
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United States of America Patent
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-
Feb 9, 1988
Grant Date -
N/A
app pub date -
Jul 23, 1986
filing date -
Jul 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To prepare an existing buried main made from a material which is tough at ambient temperature for replacement by a new main of the same or a larger size via a mole device by fracturing the existing main by compressive and impact forces and by widening the bore for the insertion of the new main that is clamped to the mole device, a liquefied gas having as low a boiling point as possible at atmospheric pressure is sprayed against the conduit wall from a cooling carriage that is pulled through the existing main prior to the movement of the mole device therethrough, thereby cooling the existing main to a temperature causing low-temperature embrittlement of the material of the existing main.
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