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A single-pass drilling method
Continuous flight auger drilling belongs to the dry rotary drilling methods. It is suitable for predrilling as well as for the installation of cast-in-place piles. The soil (under certain conditions also rock) is loosened and conveyed continuously using a continuous flight auger. The borehole wall is supported by the auger flights filled with drill cuttings.
1. Positioning at the drilling point
2. Auger drilling until the final depth is reached
3. Extracting the auger and pumping in concrete
4. Pressing or vibrating in the reinforcement
5. Finished pile
The video shows an LRB 125 installing cast-in-place piles using the continuous flight auger drilling method.
The auger is drilled into the ground down to the final depth in a single continuous process.
During the drilling process the auger flights convey the soil to the surface.
The auger flights filled with drill cuttings support the surrounding borehole wall during continuous flight auger drilling.
For auger drilling the drilling depth can be increased by using Kelly bars.
Concrete is poured in through the auger’s hollow stem as the auger is extracted.
With a lattice boom leader and crawler crane as carrier machine, cast-in-place piles of more than 50 metres in length can be produced using the CFA method.
Due to anticlockwise rotation during auger extraction less drill cuttings are conveyed to the surface, which is ideal for predrilling.
Predrilling also serves as preparatory measure for subsequent pile driving work.
When augers with a wide hollow stem are used, the reinforcement cages can be inserted before the auger is extracted again.
Foundation work for a new hospital building.
