| 摘要 |
PURPOSE:To form a water shield wall having a high water-sealing effect by a method in which jet water is jetted into a grout hole, slits are provided in the direction of the adjacent grout holes, and a pressure grout is injected into the grout holes. CONSTITUTION:Grout holes 4 of a circular cross section are drilled at intervals in the ground, and then while supplying high-pressure jet water from a jet nozzle, the nozzle is pulled up to form slits in the longitudinal direction of the grout holes 4. A pressure grout is injected into the grout holes 4, whereupon cracks develop along the extended direction of the slits 3 and connected with each other between the grout holes 4 to form a continuous water shield wall. |
