METHOD AND APPARATUS FOR TRENCHLESS EXTRACTION OF PIPE
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United States of America Patent
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Issued Date -
Nov 16, 2023
app pub date -
May 10, 2023
filing date -
May 10, 2023
priority date (Note) -
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Abstract
Apparatus for trenchless extraction of pipe includes a housing rigidly connectable to a pipe to be extracted, a tension helmet disposed over an end of the housing, the tension helmet connected by tensile elements to a hydraulic impact hammer supported by the housing, and resilient shock absorber disposed between the tension helmet and the housing. The hammer is operated to impact a striker plate on the housing, which drives the pipe to be extracted forward and thereby creating a gap between the striker plate and the hammer and compress the shock absorber. The shock absorber then resiliently expands, thereby pushing the tension helmet forward and bringing the hammer back into alignment with the striker plate.
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