| 摘要 |
PROBLEM TO BE SOLVED: To provide an infiltration preventive method for ground water collected into a drainage boring to a bedrock as one of countermeasures against landslide. SOLUTION: Expansible filters are doubly covered to the outside of a drainage pipe, both ends of each filter are fixed with a band, a chemical feeding pipe is inserted between the filters, and a space between the drainage pipe and a boring hole is filled with a filler so as not to leak the chemical. The chemical expanded by reaction with water or between two liquids is fed between the filters by a pump through an injection pipe. COPYRIGHT: (C)2004,JPO
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