| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for forming an underground wall into the ground where a cavity part exists without requiring huge costs, time and labor for grasping the cavity part, or without making thick the thickness of the whole underground wall.SOLUTION: Preceding holes 7 are drilled with gaps at a scheduled spot 6 of an underground wall 1, and a cavity part 20 is found out, and an installation avoidance spot 61 is set, and a portion excluding the installation avoidance spot 61 is determined as an installation execution spot 62. An arch-like bypass installation spot 64 bypassing the installation avoidance spot 61 is set, and a buttress installation spot 65 is set at the opposite side. Drilling holes 8 are drilled, and wall forming materials 9 are arranged at the installation execution spot 62 and the bypass installation spot 64 such that the underground wall 1 is formed, and a buttress 11 is formed at the buttress installation spot 65. When the cavity part 20 is found out at the bypass installation spot 64, the depth position of the cavity part 20 is estimated, and the underground wall 1 in this portion is made thicker than the other portions.</p> |
