The jet grouting method is a form of subsoil injection for creating cement-soil mixture bodies in the ground. Here, the existing soil is mixed under high pressure with a cement-containing binding agent suspension.

During the manufacture of the jet grouting bodies, water and / or a cement suspension is introduced into the subsoil under high pressure. The shape of the bodies can be either columnar, elliptical, or lamellar. The drilling depths are usually up to 10 to 30m.

The range of floors in which jet grouting can be used is very large. The essence of the process consists in the destruction of the soil structure by means of a rotating high pressure jet. This allows larger diameters to be achieved in loose soils and smaller diameters in cohesive soils. In most cases, relatively light, agile devices are used.

The manufacture of the jet grouting body is usually carried out by drilling the drill pipe down to the lowest point. Then the rod is slowly pulled while rotating while the high pressure jet emerges from the nozzles. Depending on the number of media used, a distinction is made between the following processes:

• One-phase system: Use of a cement suspension high-pressure jet (up to approx. 400 bar) to cut open the floor and to create the sprayed body at the same time
• Two-phase system: Use of an air-coated cement suspension jet to cut open the floor.