PURPOSE: To widen the injection range of grout as well as increase unit amount of discharge by providing a stirring blade having an opening at its top as a nozzle including two flow paths.

CONSTITUTION: Stirring blades 5 and 6, having an intermediate nozzle 7 opened at the tops of the blades 5 and 6, a nozzle 8 surrounding the intermediate nozzle 7, and pathways 14 and 15 leading to the nozzles 7 and 8, are connected to a material supply portion (not illustrated) through a swivel 11 at the upper part. The stirring blades 5 and 6 are extentionally set at the top of an injection tube 1 with a turning and vertical moving mechanism. Inner tubes 3aW3c through materials are supplied to the pathways 14 and 15 of th stirring blades 5 and 6 are provided in parallel in the inside of the outer tube 2 of the injection tube 1. When a hardening agent is supplied to the pathway 14 and air is supplied to the pathway 15, the hardening agent surrounded by air is jetted in streams from the extended position of the injection tube 1. When A-liquid is supplied to the pathway 14 and B-liquid is supplied to the pathway 15, completely mixed solutions are formed at the same time as injection is made and injected into the ground.