JETGROUTING is a complicated process that normally requires trials to be able to predict how effective the process will be for the soil material and requirement at hand.
The basic JETGROUTING process is the injection of grout in the ground at very high pressure (through rotating nozzles) creating a jet effect.
The jetting effect consists of breaking up the soil and mixing the loosened soil with cement grout, the resulting “column” that is formed is very dependant on the soil being mixed, the grout composition, grout volume and time spent mixing the soil & grout together. The results can vary enormously depending on the ground material, ground strata, speed of rotation, grout pressure, nozzle size, number of nozzles, grout volume and speed of extraction etc.
Even with all the above variables there are three main JETGROUTING processes depending on the number of fluids simultaneously injected:
Single fluid: cement grout only,
Double fluid: cement grout with air,
Triple fluid: cement grout with air and water.
All of these processes can be combined with a pre process called pre-cutting.
This process can be used before the JETGROUTING process to initially destroy the ground and form a larger diameter column when JETGROUTING.
The entire process is very dependant on consistency and that is where the automated control of the rig becomes a key factor in quality control. The LT3 JETGROUTING computer when installed can control the drill rig for rotation speed and lifting rate eliminating much of the human error and maintaining consistency.
Please see the .pdf brochure for more detailed information.
View the Brochure Here
