NATURAL GROUND REINFORCING BODY AND CONSTRUCTION METHOD OF NATURAL GROUND REINFORCING BODY

摘要

PROBLEM TO BE SOLVED: To provide a natural ground reinforcing body capable of positively restraining the displacement of the natural ground around a tunnel excavated in the natural ground which is soft with low strength. SOLUTION: The natural ground reinforcing body comprises a pipe body 2 inserted in a hole 1 bored in the natural ground from the top end face of the tunnel and stuck into the hole by injecting a hardenable material such as mortar between the outer peripheral surface and a hole wall and hardening it; a consolidated body 4 formed of a hardenable material injected into the pipe body 2 and hardened; and a short-sized bar body 3 disposed in the center part in a base part of the pipe body 2 and embedded and integrated into the consolidated body 4. The base end of the bar body 3 projected into the tunnel from the base end opening of the pipe body 2 is stuck onto a tunnel peripheral wall surface 22 by an anchor implement 5. When tensile force is applied to the bar body 3 by the displacement of the natural ground, the displacement is restrained by the pull-out resistance force of the bar body 3 and in-pipe consolidated body 4, and then the displacement is restrained by the pull-out resistance force of the pipe body 2. COPYRIGHT: (C)2007,JPO&INPIT