| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of drastically reducing waste sludge and constructing a satisfactory improved matter inexpensively in a short construction schedule, thereby performing the containment of contaminated soil. SOLUTION: In this method, an excavation tool is used, having a lead pipe, a shaft body and a spiral impeller, and provided with multiple claws for agitating soil on the upper and lower faces of the spiral impeller. The method comprises: a process in which soil of the boundary part of a side part of a region 30 contaminated by contaminant is excavated by the excavation tool to a given depth, then cement milk is injected from an injection pipe of the excavation tool and mixed with the soil of the boundary part to form an improved matter 31 on the side part of the region 30; and a process of excavating soil in the region 30 to a given depth, then injecting cement milk from the injection pipe and mixing it with the soil in the lower part of the region 30 to form an improved matter 32 at the lower part of the region 30. COPYRIGHT: (C)2009,JPO&INPIT
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