| 摘要 |
A ground reinforcing method that is applied when tunnels, underground cavities or the like are dug, characterized by comprising the steps of attaching a ring bit (20) having a drilling function to the front end of a pipe (11) of fiber-reinforced resin, receiving in the pipe a drilling rod (22) that is mounted at its base end on a rock drill (10) and that has a drilling bit (22a) at the front end directly or indirectly removably mounted on the pipe, drilling holes in the ground at predetermined positions in the outer periphery of the facing and/or face in the tunnel digging or the like while successively connecting the pipes (11) and drilling rods (22), simultaneously placing the pipe at a predetermined position in the ground as a reinforcing pipe by driving it in while pulling into the ground the pipe that engages the drilling bit as the latter is advanced, recovering the drilling rods by extracting the latter from the pipe during or after the driving-in of the pipe, and injecting a hardening agent into the surrounding ground through the pipes so as to reinforce the ground. With the above arrangement, the ground can be satisfactorily reinforced without widening the tunnel cross-section. |
