UNDERGROUND CONTINUOUS CUTTOFF WALL METHOD AND DEVICE FOR STIRRING MUDDY WATER IN UNDERGROUND CONTINUOUS CUTTOFF WALL METHOD

摘要

PURPOSE:To enable simple and sure working of an underground continuous cut-off wall by making hardening slurry and stabilizing liquid flow into a dug hole and stirring them by means of a laminate body pierced through in a zigzag form. CONSTITUTION:Hardening slurry 3 is made to flow in a hole 2 dug to a given depth by a stabilizing-liquid excavation method wherein digging is made by using stabilizing liquid 1 whose main content is bentonite water. The hardening slurry 3 and the stabilizing liquid 1 are stirred by a stirring device 4 provided in the dug hole 2 and then hardened, thereby an underground continuous cut-off wall 5 being constructed. The stirring device 4 is a laminate body formed by arranging plural number of metal panels 7 in plural number of layers and piercing holes 8 are provided in a zigzag form by means of mesh plates having several numbers of piercing holes 8. The stirring device 4 thus formed is hung down into the dug hole 2, stirring the slurry 3 and the stabilizing liquid 1 jetted out from a discharge port 9.