የሚሄድ የJet Grouting ማሽን

Walking jet grouting rigs are self-propelled, track or wheel-mounted drilling and grouting systems engineered to deliver controlled high-pressure fluid injection into the subsurface for ground improvement, sealing, and stabilization purposes. These integrated units combine a power plant, hydraulic pressure system, drilling mast, and control systems in a single mobile platform, enabling continuous jet grouting operations across confined sites and challenging terrain where conventional stationary drilling equipment cannot be efficiently deployed. In deep foundation engineering, walking jet grouting rigs are deployed extensively for constructing cutoff curtains beneath dam foundations, beneath contaminated sites, and along riverbanks to control seepage and contaminant migration. They are equally critical for creating post-grouted joint seals in diaphragm wall construction, achieving impermeability at panel joints and reducing hydrostatic pressure acting on wall structures. Additionally, these rigs support foundation stabilization through in-situ soil displacement and densification, particularly in alluvial deposits, silts, and sands where traditional deep foundations require ground improvement. Jet grouting performed by walking rigs also reinforces existing pile groups, remedies settlement-prone zones, and creates underwater cutoff barriers in marine and lacustrine environments. The operational principle relies on injecting pressurized grout slurry (typically bentonite-cement or cement-based suspensions) through a jetting nozzle at pressures typically ranging from 200 to 600 bar, creating a cylindrical or conical column of treated ground with controlled geometry and homogeneity. The operator controls injection pressure, flow rate, and rotation speed to manage the size and strength of the treated zone, while the walking mechanism allows the rig to position itself precisely over each treatment location and advance systematically across the project site. Pressure-monitoring systems and flow meters provide real-time feedback to ensure quality control and traceability of every treatment operation. Walking jet grouting rigs are 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 driven by design specifications and site accessibility. Equipment selection depends on multiple factors: design injection pressure and volume requirements derived from hydrogeological and geotechnical investigation; subsurface stratigraphy and abrasiveness (determining 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.