| 摘要 |
PROBLEM TO BE SOLVED: To provide a sludge reuse technique, which is simplified, results in a space saving and conducts a treatment with a high efficiency. SOLUTION: Sludge is reused through a reuse-liquid manufacturing step, when grains having a grain size larger than 4.5 mm are removed from sludge discharged by soil-improvement works and a reuse liquid in which the dry content of residual grains reaches 5 wt.% or less is obtained, and an injection step, when the manufactured reuse liquid is mixed as it is or with other materials as a part or the whole of water used for a soil improvement and injected at a pressure of 1 MPa or more into a ground from a nozzle in which a nozzle bore is set in 1.0 mm or more, the tensile strength of a section forming an internal surface in 370 N/mm<SP>2</SP>or more, a strength in 305 N/mm<SP>2</SP>or more and a Rockwell hardness in 40 or more. COPYRIGHT: (C)2005,JPO&NCIPI
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