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Continuous flight auger drilling
A single-pass drilling method
CFA drilling (cast-in-place piles)
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.
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Kelly extension
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Leader top for auxiliary rope
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Rotary drive
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Leader
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Auger
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Auger cleaner
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Auger guide
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Auger starter
Procedure of producing a cast-in-place concrete pile with continuous flight auger drilling:
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
Video: Continuous flight auger drilling
The video shows an LRB 125 installing cast-in-place piles using the continuous flight auger drilling method.
Drilling with continuous flight auger
The auger is drilled into the ground down to the final depth in a single continuous process.
Conveyance
During the drilling process the auger flights convey the soil to the surface.
Auger flights filled with drill cuttings
The auger flights filled with drill cuttings support the surrounding borehole wall during continuous flight auger drilling.
Kelly extension
For auger drilling the drilling depth can be increased by using Kelly bars.
Concreting
Concrete is poured in through the auger’s hollow stem as the auger is extracted.
Drilling rig with fixed leader for drilling depths of more than 50 metres
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.
Preparatory drilling
Due to anticlockwise rotation during auger extraction less drill cuttings are conveyed to the surface, which is ideal for predrilling.
Predrilling
Predrilling also serves as preparatory measure for subsequent pile driving work.
Continuous flight auger with wide hollow stem
When augers with a wide hollow stem are used, the reinforcement cages can be inserted before the auger is extracted again.
Continuous flight auger drilling with the positioning system LIPOS
Foundation work for a new hospital building.
Tools for professionals
- Augers, auger starters, auger cleaners
- Wear parts (chisels, teeth, pilot bits)
Get in touch
If you have any further questions, please contact our local sales or service team.
