Continuous flight auger drilling

CFA drilling

CFA drilling

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

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.

Examples with continuous flight auger drilling

  • The auger is drilled into the ground down to the final depth in a single continuous process.

    Drilling with continuous flight auger

    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.

    Conveyance

    During the drilling process the auger flights convey the soil to the surface.

  • When augers with a wide hollow stem are used, the reinforcement cages can be inserted before the auger is extracted again.

    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.

  • Concrete is poured in through the auger’s hollow stem as the auger is extracted.

    Concreting

    Concrete is poured in through the auger’s hollow stem as the auger is extracted.

  • Due to anticlockwise rotation during auger extraction less drill cuttings are conveyed to the surface, which is ideal for predrilling.

    Predrilling

    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.

    Predrilling

    Predrilling also serves as preparatory measure for subsequent pile driving work.

  • For auger drilling the drilling depth can be increased by using Kelly bars.

    Kelly extension

    For auger drilling the drilling depth can be increased by using Kelly bars.

Video continuous flight auger drilling

A combined piling and drilling rig LRB 125 installs cast-in-place piles using a continuous flight auger. It is assisted by a truck mixer and stationary concrete pump from Liebherr.

The video shows an LRB 125 installing cast-in-place piles using the continuous flight auger drilling method. Play video

A combined piling and drilling rig LRB 125 installs cast-in-place piles using a continuous flight auger. It is assisted by a truck mixer and stationary concrete pump from Liebherr.

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