Double Fluid Jet Grouting Mean?
Double jet fluid grouting is a form of the trenchless technique, jet grouting. This method of jet grouting simultaneous injection of a high pressure, high-velocity cementitious grout and compressed air ejected from the grout monitor to break down, remove and mix the in-situ surrounding soil.
Double fluid jet grouting gets its name due to the use of a two-component system (the grout and compressed air) to perform this operation.
Trenchlesspedia Explains Double Fluid Jet Grouting
Jet grouting is a trenchless technique that is used to improve the mechanical properties of the soil and improve soil stability. It involves jetting a high pressure, high-velocity fluid from the sides of a grout monitor attached to the end of a drill string. The fluid breaks up, extracts and mixes with the soil to form a homogenous, high-strength soil-cement column structure.
Double fluid jet grouting is a two-phase system in which involves a coaxial air and grout jet supply in order to increase penetration range and efficiency of the soil-cement slurry. In addition, due to an air-lifting effect, the extraction of excess soil is along the drilling rod is improved. Double fluid jet grouting is capable of creating larger is more efficient and capable of creating larger columns than single fluid jet grouting but less efficient than triple fluid jet grouting.