METHOD OF CUT OFF CONSTRUCTION OF OVERFLOW WATER BY CUT OFF CHEMICAL IN DEEP LAYER BORING HOLE

摘要

PURPOSE: To surely cut off water by backfilling a recessed hole part deeply dug due to generation of leakage water with granular substance capable of being drilled by a drilling edge, and pouring a water cut-off chemical thereon by a capsule or an injection rod to form a consolidated layer. CONSTITUTION: After forming a recessed hole part 3 by deep digging due to generation of leakage water by a cracked position 2 of a boring pit 1, a drilling rod 4 is lifted, the recessed hole part 3 is backfilled with granular substance 5 having about 3-10 mm diameter and specific gravity about 1.2 or over such as glass balls or baked clay capable of being crushed by a drilling edge. Next a capsule 6 enclosed with a water cut-off chemical is brought down, and the water cut-off chemical is poured into the sedimentary layer of the granular substance 5 to form a consolidated layer with the substance 5 as aggregate. Of course when the cracked position 2 is positioned over the sedimentary layer of the substance 5, or even if it is covered with the sedimentary layer, the water cut-off chemical permeates the cracked position through the gap of the aggregate to blockade it. Next after confirming water cut-off, drilling is again performed.