Standards and regulations
Bored pile walls are calculated in accordance with DIN EN 1536 and the recommendations of the “Construction Pits” Working Group (Empfehlungen des Arbeitskreises “Baugrube”, EAB). Diameters typically range from 60cm to 150cm, with standard depths of 15m to 30m.
Production begins at ground level in the course of the shoring line by creating a concrete boring template. Cased or uncased boreholes, depending on the stability of the subsoil, are then driven into the ground using rotary drilling.
If groundwater is present, boring is carried out with hydrostatic force in order to prevent the groundwater pressure from causing a break in the ground.
Once the planned final depth has been reached, a reinforcement cage is inserted. The concrete is then poured using the contractor method. A concreting pipe is guided into the borehole up to the pile toe and the concrete is discharged from the bottom of the concreting pipe, forcing water and slurry upwards. This is continuously extracted and reused. Concreting is thus carried out from the bottom up.
House connection lines can be realised later via a removable plug-in girder shoring without time-consuming mortising work. For this purpose, the concreting is not carried out up to the top edge of the ground and after concreting the plug-in beams are placed in the reinforced piles. The empty borehole is then backfilled with suitable material. The excavation is used to install the timber shoring, which can be removed once the shell has been completed and is no longer functional.
Anchored bored pile walls
At large excavation depths, the bored pile wall is anchored to reduce head deformations and pile diameters. The anchors for the anchored bored pile wall can be manufactured to remain permanently in the ground or to be removed, either partially or completely. As a leading supplier of grouted anchors, our company offers different anchor systems from a single source and can thus always provide the technically and economically optimal solution for the client’s construction project. Bored pile walls at large depths are economically dimensioned by using anchors, chording or bracing. If the construction pit is especially deep, the bored pile walls are secured with several layers of anchors.