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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.

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.

01/05

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.

LRH 600

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.

01/04

Machines

Results 1–6 of 17

  • Operating weight - 52.8 t

  • Max. torque - 200 kNm

  • Kelly drilling, max. drilling depth - 34.5 m

  • Kelly drilling, max. drilling diameter - 1,500 mm

  • Operating weight - 69.3 - 79.9 t

  • Max. torque - 252 kNm

  • Kelly drilling, max. drilling depth - 53.2 m

  • Kelly drilling, max. drilling diameter - 3,300 mm

  • Operating weight - 71.1 - 82.1 t

  • Max. torque - 252 kNm

  • Kelly drilling, max. drilling depth - 53.2 m

  • Kelly drilling, max. drilling diameter - 3,300 mm

  • Operating weight - 73.6 - 84.6 t

  • Max. torque - 297 kNm

  • Kelly drilling, max. drilling depth - 70.8 m

  • Kelly drilling, max. drilling diameter - 3,400 mm

  • Operating weight - 75.5 - 85.5 t

  • Max. torque - 297 kNm

  • Kelly drilling, max. drilling depth - 70.8 m

  • Kelly drilling, max. drilling diameter - 3,400 mm

  • Operating weight - 99.0 - 111.1 t

  • Max. torque - 347 kNm

  • Kelly drilling, max. drilling depth - 77.5 m

  • Kelly drilling, max. drilling diameter - 4,100 mm

Continuous flight auger drilling with the positioning system LIPOS

Foundation work for a new hospital building.

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Tools for professionals

  • Augers, auger starters, auger cleaners
  • Wear parts (chisels, teeth, pilot bits)
CFA drilling tools

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If you have any further questions, please contact our local sales or service team.

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