DIAPHRAGM WALLS
D
iaphragm walls are installed when excavation will be below the groundwater table, and near-watertight walls are a requirement.
The trench wall is constructed using slurry excavation techniques, with temporary guide walls to maintain correct trench alignment.
Wall thicknesses can vary from 500m to 1500mm, with depths to 50 metres.
Walls are constructed in panels, using end stops to retain the concrete and to form water control joints. Concreting is carried out utilising tremie methods, with long panel sections requiring use of multiple tremies to ensure uniform placement of concrete along the wall panel.
