The construction of large diameter rotary jet grouting pile is proposed to adopt double pipe jet grouting, which is composed of air and slurry in the grouting process. The enveloped air is used to enhance the progressive cavity widening in the soil, allowing the jet to penetrate further, forming a larger diameter than the single-tube system. In addition, it blows out the cutting mud to prevent the drilling annulus from plugging and thus preventing the ground uplift.

In brief, large diameter rotary jet grouting pile construction starts by connecting the grouting rod and drilling the toe to the desired depth using a wash hole. When the bit touches the toe at the design depth, a high-pressure pump with grout is activated with compressed air. Pressure, flow rate, rotational speed, pullback, drilling torque and inclination were recorded by monitoring screen data logger. Two fluid injection grouting uses three types of injection tools, they are:SonicJet SJ System,Trevi System and Shanghai system.

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