Large bored pile
Bored piles are used as a foundation element for load transfer into foundation soils able to bear loads or as pile walls to secure a vertical terrace. They are used in particular wherever high vertical loads, horizontal loads of torques have to be transferred. Bored piles can also be manufactured with limited construction heights and from a pontoon.
Bored piles are measured and manufactured acc. Eurocode 7, DIN EN 1536 and the recommendations by the Piling Working Group.
The loosening and transport of the soil takes place aligned to the adjacent foundation soil in the rotary drilling procedure or with drilling grabs. The required support of the borehole wall is guaranteed through piping. An alternative is the support through a suspension. By simultaneously rotating and pressing, the piping is inserted so that it is consistently ahead of the excavation. In stable, cohesive foundation soils, the borehole can also be executed without piping. When using the rotary drilling procedure, an enlargement of the pile footprint is possible using a base cutter.
At the end of the drilling process, the reinforcing cage is inserted and the pile is concreted. The concrete installation must take place using the Tremie method if the borehole was sunk with water load or using suspension support.
Manufacture under height restrictions.
Bored piles can also be manufactured under height restrictions. Height limitations may occur through work in existing buildings, under bridges or under power lines. The manufacture of bored piles is generally possible from a working height of approx. 5 m.
The work of the drilling tools and the pipe system is vibration-free. Therefore, foundations can also be executed in densely-populated areas and directly next to vibration-sensitive neighbouring developments.
- High load transfer
- Execution under height restrictions possible