| 摘要 |
PURPOSE:To safely build a continuous wall rigid foundation through complete prevention of the occurrence of collapse, by a method wherein an increase in an underground water level at the interior is detected, and an underground water level within a well caisson is artificially lowered, based on a stable water level within an excavated hole to execute a work. CONSTITUTION:A first wall body 2a is formed, panel excavation is effected in order to form a following stage wall body 2b, and a rocking plate 8 is pulled off for cleaning. The interior is surrounded with a wall surface to close a water escape place to gradually increase a water level, and the water level is increased over that of a stabilizing solution 13 with which an excavated hole is filled. It is detected by the use of an observing well that a water level at the interior of the excavated hole is increased, water is drained by the use of a well point 14, and a water level is artificially lowered. This enables the level of the stabilizing solution to be always held at a level higher than an underground water level outside an excavated hole wall, and permits complete prevention of collapse of the excavated hole wall. |
