Kelly Guided Hydraulic Grab technology is a highly efficient solution for diaphragm wall construction, designed to provide accurate excavation geometry and superior verticality control. The hydraulic grab is mechanically guided by the Kelly system mounted on the diaphragm wall rig, ensuring stable and precise excavation throughout the panel depth.
The excavation is performed under the support of stabilising slurry, typically bentonite or polymer, which maintains trench stability and prevents collapse of the excavation walls. The Kelly guidance system improves excavation accuracy, especially in deep panels and demanding ground conditions, while ensuring controlled grab movement during excavation cycles.
Kelly guided hydraulic grabs are widely used in complex civil engineering and infrastructure projects where high excavation precision and reduced deviation are required.
Typical applications include:
- Deep basement and underground structures
- Metro and underground transport systems
- High-precision retaining walls
- Urban deep excavations
- Large infrastructure and foundation projects
