MUD PRESSURIZED HIGH DENSITY SLURRY SHIELD METHOD

摘要

PROBLEM TO BE SOLVED: To provide a pressurized high density slurry shield method which is used for object soil including cohesive soil at a high rate, which extends a pressure-feeding distance for removed soil by reducing the adhesion of the cohesive soil to a surface board of a shield machine, the adhesion of the cohesive soil in a chamber, and the adhesion of the cohesive soil in pressure feed piping, which reduces the volume of the removed soil by pressure-feeding it in a hard state, without the liquefaction of the removed soil, and which can prevent the generation of noises in pressure feeding by suppressing the occurrence of a pneumatic-hammer phenomenon.;SOLUTION: In this pressurized high density slurry shield method, a mud creating material is injected into sediment which is excavated by a cutter, and mixed so as to be turned into mud; the mud is infilled into a mud creating chamber in the rear of the cutter; excavation is performed by mud pressure which is generated in the mud creating chamber; and a specified cationic surface active agent is contained in the mud creating material.;COPYRIGHT: (C)2005,JPO&NCIPI