Jet grouting systems:
Single system: Process in which the disaggregation of the soil and its cementation are achieved by a high-energy jet of a single ﬂuid, usually a cement grout. An adequate column diameter is already achieved with this system in homogeneous soils.
Double (air) system: Process in which the disaggregation of the soil and its cementation are achieved by one high- energy ﬂuid (usually a cement grout), assisted by an air jet shroud as a second ﬂuid to maintain the energy of the ﬂuid jet over a longer distance. Wherever air support is advisable, larger column diameters can be achieved compared to the single system.
Triple system: Process in which the disaggregation of the soil is achieved by a high-energy water jet, assisted by an air shroud, both aimed to achieve a larger column diameter. Its cementing is simultaneously obtained by a separate noncutting grout jet.
The execution of continuous jet elements can be achieved by single columns executed in the runner sequence, or by single columns executed in the pilgrim step mode. A fresh- in-fresh sequence aims to further integrate the individual columns of the longer planar elements.