| 摘要 |
PURPOSE:To enable the gel time of a grout to be freely set up until it permeates into the ground and hardens after being injected by setting the gel time including the passing time of the grout from a mixer to the outlet of an injection tube. CONSTITUTION:An injection tube 6 with an outlet port 8 is inserted into a guide tube 1, and a mixer 14 having inlet ports through which a liquid A and plural liquids B constituting a mixed grout are let in and having a system to mix the liquid A and properly selected liquids B and then to send the mixed grout to the injection tube 6 is set on the ground's surface. By selecting the gel time of the grout, including the passing time of the grout from the mixer to the outlet port 8 of the injection tube 8, the grout is sent under pressure to the injection tube 6, and then injected stepwise into the ground while pulling up the tube 6 for every step. At the time when the injection of the grout is stopped, the supply of the liquids B is stopped by delaying as much as the passing time from the mixer 14 to the outlet port 8 of the tube 6 at least after the stoppage of the supply of the liquid A. |
