Injection device and grouting of ground injection material

摘要

PROBLEM TO BE SOLVED: To provide a device and a construction method for injecting a grouting material which can surely prevent a backflow of the grouting material.;SOLUTION: An injection port 5d for injecting the grouting material into the ground is drilled in the outer peripheral surface 5c of the outer pipe 5 of the injection device; an annular edge 7a is provided by forming an annular groove 7 near the injection port 5d; and a tapered part 7c with such a gradient as to enable the close contact of a sleeve 6 for a check valve composed of an elastic body is provided from the edge 7a to the bottom 7b of the groove 7 with a difference of elevation with respect to the edge 7a near the edge 7a. The sleeve 6 is mounted in such a manner as to cover the injection port 5d and the groove 7. After the outer pipe 5 is inserted into an excavated hole which is formed in the ground, the grouting material is fed into the outer pipe 5, jetted from the injection port 5d, and injected into the ground through a joint T between the outer peripheral surface 5c and the sleeve 6.;COPYRIGHT: (C)2006,JPO&NCIPI