Diaphragm walls have a static and / or sealing function and can serve as cut-off walls for dams or excavation pits, as foundations or as enclosures / exterior wall of structures.
They are executed as concrete or steel-reinforced concrete walls, built from ground level. Made of plastic concrete cut-off walls, they are adequately ductile to provide required flexibility in earthen embankments of dams. As structural concrete walls, they are considered very resistant to deformation and virtually water-impermeable. They are excavated in sections or elements / panels (primary and secondary) by crawler cranes using suitable diaphragm wall grabs or cutters, with the aid of a stabilizing fluid, between previously fabricated guide walls, which serve primarily to guide the excavator, allow fluctuations in level of the stabilizing fluid and carry temporary loads from the reinforcement or stop end elements if required for structural walls. When the final depth is reached, the stabilizing fluid is desanded and the bottom of the excavated element / panel is appropriately cleaned. Then the concreting by tremie-method is carried out.
Diaphragm Wall (grabbed) Details
Diaphragm Wall (cut) Details
"BAUER Trench Cutter Systems" brochure