Sealing walls with supporting elements
Sealing walls represent an inexpensive procedure for the manufacture of water-tight excavation pits, where low demands are placed on the deformation characteristics.
The manufacture of the sealing walls takes place in accordance with the same principle as for cast-in-place concrete diaphragm walls. However, the manufacture takes place in a single-phase procedure. In contrast to diaphragm walls, a sealing wall mass is used for sealing walls used to support the earth walls, which does not have to be replaced. The execution is low-noise and vibration-free.
Due to the higher proportion of cement, the sealing wall mass hardens, and can also be used over any arch fixtures as a supporting element. The sealing walls are also manufactured down to an artificial sealing base or down into a sealing ground layer with low water permeability.
On reaching the target depth, the supporting elements are suspended in the fluid sealing wall mass in the statically-required length. When using sheet pile wall profiles, these adsorb the earth and water pressure loads. The sealing wall mass is only used for sealing purposes. Versions featuring supporting elements made from HEB profiles or prefabricated concrete parts are particularly economical. Here the sealing mass takes over the horizontal load transfer on the elements.
Inclinometers monitor the movements of the diaphragm wall grab during manufacture. As for the cast-in-place concrete diaphragm walls, electronic recording takes place.
The manufacture of sealing walls takes place in accordance with DIN 4126 or DIN EN 1538 as well as the recommendations by the Excavation Pit Working Group (EAB). Sealing walls have a minimum wall thickness of 45 cm.