Extractor for an injection pipe
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Jul 8, 1992
filing date -
Jul 8, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus is provided for automatically extracting a grout injection pipe through which grout is injected into fragile ground for improving the same. An extractor for an injection pipe has an extracting main body including a chucking element for chucking the periphery of the injection pipe through a chucking member, a piston cylinder having a rod to which the chucking element is secured, and a rod position detector opposite to the rod of the piston cylinder for detecting movement of the rod. A control device is included for providing an injection pipe chucking and releasing signal to the chucking actuating valve and for providing rod ascending and descending signals to a rod ascending and descending valve. The extracting main body and the control are separately located.
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