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Jet Grouting

The Jet-Grouting techniques have been developed for soil consolidation and waterproofing.
Soil is directly mixed with cement in site to treat sand and clay formations in a homogeneous, continuous and non-polluting way.

Advantages

capability to obtain columns of consolidated soil with diameter ranging from 60 to more than 300 cm by using small diameter drilled holes, in general not larger than 180÷200 mm.
capability to overpass pre-existing foundations, boulders, rocky layers.
use of light weight and small-sized drill rigs in small working areas.

Applications

underpinning
diaphragm walls
tunnel consolidations
bottom plugs
slopes consolidations
dam cut-offs
diaphragm wall gaps
break-in and break-out for TBM

Techniques
The Jet-grouting techniques are classified depending on the number of fluids injected during treatment:

Mono-fluid system: cement grout is used as breaking-up and consolidation agent (TREVIJET T1)
Bi-fluid system: cement grout and air are used as breaking-up and consolidation agent (TREVIJET T1/S)
Triple-fluid system: water and air are used as breaking-up agents, while the cement grout is used as consolidation agent (TREVIJET T2)

All Jet-Grouting techniques include a drilling phase followed by withdrawal and rotation at preset values, with simultaneous injection of fluids at high pressure.