Vertical panels are excavated under stabilising slurries using mechanical/hydraulic clamshell grabs or hydromill cutters to form a continuous cut-off, retaining and/or structural wall. Keller have a fleet of specialist wall excavation and construction equipment to complete all types of diaphragm wall and load bearing elements (LBE barrettes).  

Common Uses

  • Support of open or top down excavations
  • Create barriers to groundwater flow
  • Provide Load Bearing Elements (LBE Barrettes)

Technical Details

Diaphragm walls are constructed using grabs or cutters to create a narrow trench excavation into the ground. The trench is supported by an engineered slurry. Generally diaphragm walls are made from reinforced concrete, though unreinforced walls can also be used. Joints in adjacent panels are formed using either an over-cut (secant) technique or via temporary stop-ends. Keller offer diaphragm walls in a range of thicknesses from 450-1500mm which can be excavated to depths of 100m. Diaphragm walls are ideally used in congested areas or where the excavation depth is very deep which would otherwise require excavation of much greater soil volumes to provide stable battered slopes. The choice of a diaphragm wall would suit deep basements, underground rail stations, rail car unloaders, tunnel approaches, pumping stations and the like. Diaphragm walls can be installed close to existing structures and in restricted headroom. Diaphragm walls can also be used in combination with top down construction.