| 摘要 |
PROBLEM TO BE SOLVED: To check lose water caused in boring work. SOLUTION: In this boring work, when excavating by injecting and filling muddy water 3 formed of a mixture of bentonite being a base, carboxymetrocellulose and a dispersant into an excavation hole 5, when detecting the occurrence of lose water by a gravel layer 15, force feed of the muddy water 3 is stopped, and a polyethylene glycol solution layer 20 is formed by forcibly feeding a polyethylene glycol solution on the muddy water 3. Thereafter, a mixed liquid of mixing a bentonite pellet of applying coating for delaying contact between bentonite powder, the polyethylene glycol solution and a moisture, is forcibly fed onto the polyethylene glycol solution layer 20 as a swelling inhibitor 23, and the swelling inhibitor 23 is injected into the gravel layer 15 from the drill tip. COPYRIGHT: (C)2007,JPO&INPIT
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