In the FTJ method, hardening agent is injected from twin nozzles at the tip of the mixing blades, to install large cross-section improvement all at once. Twin-flow slurry injection results in high-speed installation, which shortens schedules. By employing compressed air the loosened soil can be discharged at the surface, avoiding the effects of displacement on existing structures.
●Improvement Column Forms & Standard Specs
![](https://www.fudotetra.co.jp/en/wp-content/themes/fudoTetraEnTheme/assets/img/solution/img_soil_ftj_01.jpg)
![](https://www.fudotetra.co.jp/en/wp-content/themes/fudoTetraEnTheme/assets/img/solution/img_soil_ftj_02.jpg)
Improvement column
![](https://www.fudotetra.co.jp/en/wp-content/themes/fudoTetraEnTheme/assets/img/solution/img_soil_ftj_03.jpg)
Jet discharge