Extractor for an injection pipe

摘要

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.