Continuous flight auger drilling

CFA 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.

  • The auger flights filled with drill cuttings support the surrounding borehole wall during continuous flight auger drilling.

    Auger flights filled with drill cuttings

    The auger flights filled with drill cuttings support the surrounding borehole wall during continuous flight auger drilling.

  • 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.
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    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.
    We need your consent This YouTube video is provided by Google. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy.

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