Walking Jet Grouting rigs

Walking jet grouting rigs na self-propelled, track or wheel-mounted drilling and grouting systems wey dem design to deliver controlled high-pressure fluid injection into the subsurface for ground improvement, sealing, and stabilization purposes. Dis integrated units dey combine power plant, hydraulic pressure system, drilling mast, and control systems for one mobile platform, wey fit enable continuous jet grouting operations for confined sites and challenging terrain wey conventional stationary drilling equipment no fit deploy efficiently. For deep foundation engineering, walking jet grouting rigs dey used plenty for constructing cutoff curtains beneath dam foundations, beneath contaminated sites, and along riverbanks to control seepage and contaminant migration. Dem dey also critical for creating post-grouted joint seals for diaphragm wall construction, wey dey achieve impermeability for panel joints and dey reduce hydrostatic pressure wey dey act on wall structures. Additionally, these rigs dey support foundation stabilization through in-situ soil displacement and densification, especially for alluvial deposits, silts, and sands wey traditional deep foundations require ground improvement. Jet grouting wey walking rigs dey perform dey also reinforce existing pile groups, dey remedy settlement-prone zones, and dey create underwater cutoff barriers for marine and lacustrine environments. The operational principle dey rely on injecting pressurized grout slurry (typically bentonite-cement or cement-based suspensions) through a jetting nozzle at pressures wey dey range from 200 to 600 bar, dey create cylindrical or conical column of treated ground with controlled geometry and homogeneity. The operator dey control injection pressure, flow rate, and rotation speed to manage the size and strength of the treated zone, while the walking mechanism dey allow the rig to position itself precisely over each treatment location and dey advance systematically across the project site. Pressure-monitoring systems and flow meters dey provide real-time feedback to ensure quality control and traceability of every treatment operation. Walking jet grouting rigs dey available in multiple configurations: track-mounted systems for soft or compressible ground with minimal surface disturbance; wheeled versions for hardstanding and access roads; compact rigs for space-restricted sites; and high-capacity units for large-volume curtain operations. Key variations include drilling depth capacity (typically 10 to 40 meters), injection pressure rating (200–600 bar), slurry flow rate (30–300 liters/minute), and power plant output (75–250 kW), with selection wey dey driven by design specifications and site accessibility. Equipment selection dey depend on multiple factors: design injection pressure and volume requirements wey dem derive from hydrogeological and geotechnical investigation; subsurface stratigraphy and abrasiveness (wey dey determine nozzle erosion rates and treatment depth); site access constraints and ground-bearing capacity; production schedule and treatment area extent; and availability of water and grout supply logistics. Operators must verify compliance with relevant EN 1997-1 (Eurocode 7 design) and EN 12715 (grouting execution standard) requirements, particularly regarding injection pressure limits for sensitive strata, slurry specification and durability, and pressure testing protocols to confirm curtain effectiveness. The equipment must deliver reproducible, measurable results with comprehensive documentation of pressure, flow, time, and volume for each injection point—critical for verifying design intent and contractual acceptance by consulting engineers and regulatory authorities.