The process which does the preliminary investigation

摘要

PROBLEM TO BE SOLVED: To provide a grout injection control method and its device capable of continuously and automatically adjusting the concentration of grout so as to become optimum in accordance with a rock mass property in the case of injection work and carrying out rock mass improvement work having the reduction of working hours and reliability.;SOLUTION: A grout injection program control line is set on the basis of a preliminary survey such as a water test or the like, and in an injection method while controlling light and shade of the concentration of the injection grout in accordance with variations in the rock mass property accompanied with the progress of a process after the starting of the injection work while monitoring injection flow limiting value and injection pressure limiting value so as to follow the control line, an undiluted solution grout with high concentration and a diluted solution are separately prepared, they are respectively pumped by independent pumps, and in order to correspond to a request for the supply of the grout having the optimum property varying concentration and composition, etc. with the progress of an injection process, and in the pipe line directly before it reaches an injection hole, it is injected while reversibly adjusting a mixing ratio and a total amount continuously making increase and decrease, etc. in accordance with a state of the rock mass.;COPYRIGHT: (C)2005,JPO&NCIPI