| 摘要 |
PROBLEM TO BE SOLVED: To provide a natural ground reinforcing construction method such as preceding tunneling work and mirror reinforcing work capable of developing high reinforcing effect in uniformity, eliminating the need of additional reinforcement at the time of tunnel excavation work, obtaining a proper natural ground reinforcing effect and executing excavation at a low cost in various excavation methods. SOLUTION: The natural ground reinforcing construction method comprises the steps for enforcement of; drilling a drilled hole h at a specified elevation angle in a natural ground 1 located at the front of work face 1a from the tunnel excavated cross section, connecting single pipe or plural pipes having discharging holes 6a of solidifying material on a surrounding wall sequentially and striking the reinforced pipe 6 into the drilled hole, injecting the solidifying material into the reinforced pipe for anchoring in the reinforcing pipe and in the surrounding natural ground or forming a solidifying region, and is characterized by structuring a steel pipe having recesses 6b at the peripheral surface either with the single pipe or plural pipes for forming the reinforced pipe 6 and by forming the discharging holes on the recesses. COPYRIGHT: (C)2009,JPO&INPIT
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