| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of conventional constructions wherein though the slurries used in various excavation methods require a specific gravity of 1.10 or below, a proper viscosity, a wall building property and large frost resistance and cement resistance, in recent constructions such as a deep underground excavation construction, conventional slurries are difficult to adapt to the treatment of large soil pressure and large water pressure, and the risk of falling increases, and though the addition of CMC for increasing the viscosity of the conventional slurries and the addition of a compound for further increasing the viscosity thereof are proposed, the lowering of flow property is pointed out, and the securement of the slurries used in the deep underground excavation method is difficult. SOLUTION: A slurry with a specific gravity of 1.01-3.0 is provided by mixing the magnetic substance which can provide a sufficiently high specific gravity and can be attracted by a magnetic force. COPYRIGHT: (C)2011,JPO&INPIT
|
