Grouting device for both injection and high-pressured jet

摘要

Provided is a device for injecting grout into the ground at low pressure through an injection device detachably mounted at a front end of a boring rod, which includes a high pressure jetting device detachably mounted at the front end of the boring rod. The high pressure jetting device includes a jet converter for jetting boring water from the front end of the high pressure jetting device when the boring rod bores the ground and changing a jet direction of boring water or grout to jet the grout toward the side of the high pressure jetting device after completion of boring. The jet converter includes: a casing having a support part formed on the inner surface thereof and an external jet hole penetrating through the side of the casing; a jet conversion cylinder airtightly inserted into the casing and having a first through hole formed to extend in a longitudinal direction from one end and a second through hole formed to extend in a lateral direction from the side and communicating with the first through hole; a push arm protruding from the other end of the jet conversion cylinder; and a pump for supplying grout into the boring rod through a grout transfer pipe by pumping the grout. The high pressure jetting device has the surface coated by a surface treating means.