| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a backfill material injection device for improving construction efficiency without requiring to stop operation of the backfill material injection device to solidification of a mixed liquid in a coagulation material injection pipe.SOLUTION: A backfill material injection device 1 is provided for injecting a mixed liquid generated by mixing a main material and a coagulation material in a mixing area, into a cavity part 5 between an excavation pit wall and a lining body, and is provided with an injection pipe 2 for forming the mixing area 3 on the front end side, a pusher 4 having a pusher head 4a for slidingly advancing-retreating in the injection pipe 2 in a tip part and capable of force-feeding the mixed liquid generated in the mixing area 3 to the cavity part 5, a coagulation material injection pipe 6 having a projection part 6a projectable from the tip of the pusher head and capable of injecting the coagulation material into the mixing area 3 from the projection part 6a, a coagulation material supply pipe 8 for supplying the coagulation material, a main material supply pipe 10 connected to the injection pipe 2 by a connection port 11 and supplying the main material to the mixing area and a wash water supply pipe 12 connected to the injection pipe 2 and cleaning the inside of the main material supply pipe 10 by supplying wash water to the main material supply pipe 10.</p> |
