Jet Grouting

Jet Grouting tecnique improves soil mechanical and permebility properties by using high-speed jets of water/cement mixture injection treatement. Jet Grouting can be advantageously in the following conditions:

  • difficult logistic conditions
  • confined spaces
  • presence of obstacles to cross
  • high-depth treatment with crossing of voids 

Consolidated elements (usually columns) are constructed using small-diameter drilling (100 to 140 mm), by means of light and easy to handle rigs. Jet Grouting is usually performed down to depths of 20-30 m. However, special projects reaching 100 m-depth have also been realized. All Jet Grouting techniques envisage a preliminary phase of drilling, followed by extraction and rotation at preset values, and simultaneous pumpings of the fluids at high pressure. Depending on the number of the fluids used, the European standards EN 12716 has identified three main techniques:

  • TREVIJET T1 - Monofluid (water/cement mixture)
  • TREVIJET T1/S - Bifluid (combination of air and water/cement mix)
  • TREVIJET T2 - Triple fluid (combination of water, air and water/cement mix). 

ELLIPTICAL JET GROUTING (EJC) is an innovative technique wich allows to realize pseudo-elliptical columns. This geometry is obtained by modifying the rotation speed in a planned way. It allows to maximize the use of jet grouting columns when the traeatment is aimed at constructing a curtain wall, thus ensuring significant time and material savings.