Walking frame jet grouting represents a specialized category of deep ground treatment equipment designed for controlled, systematic displacement of jet grouting rigs along predetermined foundation lines, enabling the creation of continuous stabilized ground columns and walls with minimal post-treatment gaps. This technology is essential for large-scale cutoff curtain formation, ground preparation beneath water-retaining structures, and subsurface stabilization where spatial continuity and vertical precision are critical operational requirements. In deep foundation engineering, walking frame systems are deployed primarily for cutoff curtains beneath dams, reservoirs, and underground structures requiring seepage control; ground improvement in advance of secant and tangent pile construction, where pre-strengthened soil reduces pile displacement effects; and jet grouting column formation for load transfer and bearing capacity enhancement in soft soil regions. The equipment is equally valuable for soil stabilization ahead of tunnel driving through mixed-ground conditions, containment barrier installation in remediation projects, and ground consolidation for foundation underpinning in settlements or cavity-prone strata. Applications span diaphragm wall preparation, sheet pile wall stabilization, and large-area ground mixing where stationary jet grouting equipment would create unacceptable zones of untreated soil. The operational principle involves a jet grouting lance suspended from a structured walking frame that is systematically repositioned along a predetermined grid pattern. As the frame advances horizontally—typically by 0.5 to 1.5 meter intervals—the lance descends and rotates or translates vertically through the design depth, injecting pressurized cement-based slurry (single-, two-, or three-fluid systems) into the soil mass at 300–700 bar pressure. This high-velocity jet erosion physically mixes the binder with the surrounding soil, creating stabilized columns or continuous walls of controllable diameter (typically 0.6–2.5 meters) and compressive strength (3–30 MPa depending on soil type and injection parameters). Walking frames eliminate the dead zones and wall discontinuities inherent in fixed-position rigs, enabling systematic full-coverage treatment across expansive project areas. Equipment configurations range from manually positioned walking frames with site-based hydraulic positioning systems to fully automated models incorporating inclinometer feedback and GPS-guided advancement control. Standard installations comprise a lattice or welded frame structure mounted on rubber-tired or tracked carriages, a high-pressure pump unit (typically 150–200 kW), a hoisting and rotation frame for lance control, and integrated control systems governing injection pressure, slurry volume, column diameter, and advancement sequencing. Selection criteria include total treatment area and soil profile heterogeneity, target column diameter and wall continuity requirements, injection depth and required compressive strength, available working height and lateral space, soil permeability and strength parameters, operational noise and vibration constraints, and site accessibility for frame repositioning between sections. Equipment choice also depends on precision requirements for vertical lance alignment, cycle repeatability, pump reliability in challenging ground conditions, and compatibility with real-time quality monitoring systems. Design and execution are governed by EN 14679:2018 (Jet Grouting – Execution of Special Geotechnical Work), EN 1997-1 (Geotechnical Design – General Rules), DIN 4093 (Jet Grouting Execution and Quality Assurance), and relevant country-specific offshore standards. Quality assurance typically includes trial column coring, unconfined compressive strength testing, and cross-hole sonic logging to verify continuity and strength development prior to full mobilization.