INJECTION METHOD FOR GROUT REGARDING CEMENT AND BENTONITE AS MAIN MATERIAL

PROBLEM TO BE SOLVED: To enable the execution of cement bentonite grout of high viscosity by pumping both liquid of a suspension regarding cement as a main component and bentonite liquid separately, and merging and mixing them before an injection inlet. SOLUTION: Cement suspension liquid A and bentonite liquid B swollen by adding clean water are prepared respectively separately. Cement used for the liquid A is normal cement or the like, and the liquid B regards montmorillonite clay mineral as a main component. Both the liquids A, B pumped separately before a grout hole provided on a target part are merged and mixed in injection of the space or the like of the inside of a structure to be injected. When it is injected into a large cavity and a large gap in a ground, drilling can be performed down to the target part, and an injection pipe is provided and injected. In the case where the injection pipe is a single pipe, they are merged and mixed before the injection pipe, and in the case where the injection pipe is a double pipe, they are merged and mixed at the edge. Thereby the liquids A, B low in viscosity are pumped to make grouts C, B high in viscosity, and execution can be performed.