The multi-pipe rotary jet grouting rig is based on the original high-pressure jet grouting method and adopts a unique multi-orifice pipe and a front-end forced slurry suction device, achieving forced slurry discharge within the hole and in-ground pressure monitoring. By adjusting the forced slurry discharge volume to control the in-ground pressure, the deep slurry discharge and in-ground pressure are reasonably controlled, stabilizing the in-ground pressure, thereby reducing the possibility of surface deformation during construction and significantly mitigating environmental impact. Moreover, the reduction in in-ground pressure further ensures the pile diameter.

In the Shanghai project, the Xitan multi-pipe rotary jet grouting rig accurately completed the MJS method reinforcement work, ensuring the reliability and safety of the project. At the same time, this construction method also greatly reduced the impact on the surrounding environment and achieved good construction results.

Stratum conditions

Location (city): Qingpu District, Shanghai

Rig model: DGZ-150C multi-pipe rotary jet grouting rig

Supporting equipment: foundation strengthening pump, high-pressure grouting pump, automatic mixer

Process type: foundation reinforcement

Construction process: MJS method pile

Construction angle: 90°

Pile diameter: φ2000 mm

Hole depth: 20 m

(MJS method pile rig main unit)

(MJS method pile rear high-pressure pump)