STABILIZING METHOD OF EXCAVATION OBJECT EARTH IN SHIELDING CONSTRUCTION METHOD

PROBLEM TO BE SOLVED: To provide a stabilizing method of excavation object earth in a shielding construction method, for easily removing a filler, hardly leaving a solid material, and capable of easily disposing the removed filler. SOLUTION: The filler reveals a viscosity of 1,000 to 12,000 cp or higher by adding water, and is formed of a water absorptive resin degelled by adding a dispersant. When on standby, a cutting face 25 is stabilized by filling the filler 38 put in a gel state by adding the water in a void and a chamber 7, and when starting excavation, a degelling agent is injected into the filled filler 38 before this start, and sucked and removed in a degelled liquid state. When a water permeable stratum such as a gravel layer is exposed to the cutting face of the excavation object earth, dissipation via its water permeable stratum is prevented by setting the viscosity of the filler 38 to 5,000 cP or higher. COPYRIGHT: (C)2005,JPO&NCIPI