Triplex Jet Grouting Drilling System D 114.3 - D 133 with rotary head and hydraulic chuck
Drilling systems like this are used to consolidate the overburden by grout injection. For this a jet pressure of 100 to 600 bar, with a flow rate of up to 400m/s, is used to cut the soil structure.
The drilling process is achieved mainly with outer flushing. The drilling tools are adapted for the extreme pressures used. Having reached the final depth the rods will be pulled up with slow pull back, allowing a jet of cement suspension or water to cut the surrounding ground. By adding air, the effective reach of the jet can be increased considerably. There are separate channels in the rods for all flushing mediums like cement suspension, water and air. In the event of hitting boulders the cuttings are partly discharged with the flushing return, and partly homogenized with the cement.
There are complete systems of D 114.3 – D 133 with different nozzle diameters and types of drill bits available. They are suitable for boulders and loamy grounds.
Examples of application: