Integrated Jet Grouting, Low-Disturbance Grouting & Ground Improvement Systems

Integrated Equipment Configuration

• Project conditions: geology, groundwater, treatment depth and geometry, sensitivity of adjacent assets, headroom, and equipment-access constraints.
• Construction-method requirements: equipment is selected for jetting, mixing, low-disturbance control, spoil return, repeat jetting, or simultaneous multi-hole grouting.
• Main equipment: rig + high-pressure water/slurry pumps + slurry preparation and supply equipment + specialized tooling + monitoring and recording system.
• Site services: pressure and water tests, field trials or parameter validation, operator training, construction-data recording, and maintenance support.

Singapore Nicoll Highway Tunnel Reinforcement

The Nicoll Highway-Promenade tunnel section in Singapore is approximately 20 m below ground, with a 5.8 m internal diameter and a 6.35 m external diameter. The alignment passes through marine clay with sand at the tunnel invert. Chengdun Sui'an carried out the on-site reinforcement works, while Shanghai JOZO supplied the LIG F2 low-disturbance grouting digital platform and supporting equipment. Used for external grouting around the tunnel, the system integrates powder storage, conveying, slurry preparation, and injection, and supports simultaneous multi-hole grouting, multiple injection sequences, single- and two-component grout, automatic records, USB export, and remote monitoring to support process management and traceability.

Shanghai East Railway Station JMP Field Trials

Two 20 m-deep JMP trial columns, with target diameters of 2.0 m and 2.6 m, were installed at Shanghai East Railway Station from 29 to 31 December 2023. Cement contents of 20% and 22% were used by depth, with a water-cement ratio of 1.2. The first trial column was exposed during site excavation five days after installation; visual inspection indicated a uniform improved-soil body and a diameter meeting the trial target. The second column could not undergo the planned 14-day coring because of site constraints. The trial also recorded self-drilling, jetting and mixing, rod handling, pump adjustment, material consumption, and displaced slurry, and identified air-lift spoil return and tooling improvements as development directions for ground-pressure control and continuous operation.

Zhangjinggao Yangtze River Bridge South Anchorage

The ZJG-A3 south anchorage of the Zhangjinggao Yangtze River Bridge North Channel Bridge uses a 90 m-diameter circular diaphragm wall extending to 53.5 m. Deep ground improvement covers approximately 5,944.7 m² and comprises 2,497 columns, with 2.4 m-diameter columns in the full-area zone and 1.7 m-diameter columns in the lattice zone. Shallow single-column and overlap trials were used for process and parameter selection before full-scale deep verification. The D-RJP trial column measured approximately 3.1 m and 2.9 m across two directions at the exposed head, meeting the 2.8 m minimum design diameter. Local mud inclusions at approximately 30-39 m were addressed by repeat jetting, after which core continuity improved. A project digital-twin system linked the main rig, back-end equipment, slurry system, filter press, and pre-drilling equipment, displaying pile position, depth, lifting speed, slurry pressure, flow, and construction status.