To obtain an injection pipe easy to divide and remove by providing a thin part (notch groove) on the outer periphery of the grout injection pipe used for consolidation and reinforcement of weak ground, and dividing the injection pipe exposed during tunnel excavation from a notch part.
A grout such as cement milk and chemicals is injected in weak ground afraid of collapse during excavation of tunnel work or the like or ground being porous to perform the consolidation and reinforcement of the ground. A V-shaped cross section node 2 (notch groove) thinning thickness in the circumferential direction is provided on at least one place of a long grout injection pipe 1 used in this time. The division node 2 can be applied to a hollow lock bolt or the like having a screw on the outer periphery. The unnecessary injection pipe 1 exposed as proceeding of excavation working is folded from the part of the node 2 to be divided and removed. Thereby the injection pipe 1 can be easily removed and the excavation working of a tunnel can be performed efficiently.
KIRIGATANI HITOSHI
SUDO TAKAHIDE
OSHIKAWA HIROTOSHI
SANO KAZUE
