ADDITIVE, AND SOIL-PRESSED SHIELD METHOD AND SOIL-PRESSED PIPE-JACKING METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an additive with which sufficient plastic flowability is imparted to all grounds (excavated soil) of sandy, gravelly, and viscous grounds by using its quantity less than that of the conventional additives, and to provide a soil-pressed shield method and a soil-pressed pipe-jacking method using the additive.;SOLUTION: The additive is to be added to the excavated soil generating in the soil-pressed shield method or the soil-pressed pipe-jacking method, and formed by compounding 10 wt.% or more of cellulose-based chemical agent, 10 wt.% or more of surfactant or dispersant, and a polyacrylamide-based chemical agent of a wt.% obtained by subtracting the sum of the wt.% of the cellulose-based chemical agent and that of the surfactant or the dispersant from 100 wt.%.;COPYRIGHT: (C)2010,JPO&INPIT