Jet grouting is a highly specialized technique used to create an in-situ mass of cemented soil also called soil-cement. A drill rig advances a relatively small diameter (4-8 inches) jet grout tool to the bottom of the proposed treatment zone and injects fluid grout at high velocity. The drill tool is withdrawn and rotated at a constant rate as the grout erodes and mixes the surrounding soil to create a soil-cement column from the bottom elevation upwards.
Jet grouting techniques can be classified as either single system (utilizing grout only), double system (grout and air) or triple system (grout, water and air). Each system has unique advantages and selection of the jet grouting system is dependent upon project specific criteria. Malcolm’s proprietary MEGA-Jet grouting technique is a modified double fluid system that is capable of generating columns up to 18ft in diameter. This modified double fluid system utilizes a specialized multi-chambered drill rod system to convey slurry grout and air to the jetting tool. A high velocity coaxial stream of slurry grout is shrouded within a sheath of high pressure air to mix and erode the in-situ soils. The highly sophisticated MEGA-Jet monitor utilizes a unique array of nozzles specifically designed to focus the injection media at a given radius in balance with the chosen flow rate, line pressure and fluid specific gravity.