| 摘要 |
PROBLEM TO BE SOLVED: To reinforce a ground excellently without broadening the width of a tunnel cross section regarding a ground reinforcing construction method adapted at the time of excavation of a tunnel, a cavern, etc. SOLUTION: A ring bit 20 having a drilling function is installed at the front end of a pipe consisting of a fiber-reinforced resin, a drill rod 22, in which a rock drill 23 is mounted at a base end section and a drill bit 20 is set up detachably at a front end section directly or indirectly to the pipe, is housed in the pipe, drilling is conducted as successively extending the pipes and the drill rods 22 into a ground at the specified places of the facing outer circumference and/or face section of tunnel excavation, etc., respectively while the pipes engaged with the bit 22 are propelled and driven as being pulled into the ground as the drill bit 20 progresses, and the pipes are placed at the specified places in the ground as reinforcing pipes 11. The drill rod 22 in the pipes are extracted and recovered when the pipes are driven or after the driving of the pipes, and a solidifying material is injected into the peripheral ground and the ground is reinforced.
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