Kelly drilling

Kelly drilling

Kelly drilling

Kelly drilling
Procedure with uncased Kelly drilling:
1. Installing the protective pile
2. Emptying, e.g. with an auger
3. Inserting the reinforcement
4. Concreting
5. Finished pile

Kelly drilling belongs to the most common dry rotary drilling methods and is used for the production of bored piles with a large diameter (from a size of approx. 500 mm). The process is suitable for nearly all types of soil and rock. The soil is conveyed with relatively short rotary drilling tools, such as augers, core barrels, buckets and special drilling tools. A typical element of this drilling method is the drill rod, the so-called Kelly bar, which is telescopic and facilitates large drilling depths.

Examples for Kelly drilling

  • When the soil is insufficiently solid or in case of groundwater ingress boreholes must be produced using a casing

    Cased Kelly drilling

    When the soil is insufficiently solid or in case of groundwater ingress boreholes must be produced using a casing

  • Solid, dry building ground allows borehole installation without a casing. A drilling rig at work in the business district La Défense, Paris.

    Uncased Kelly drilling

    Solid, dry building ground allows borehole installation without a casing. A drilling rig at work in the business district La Défense, Paris.

  • For diverse soil conditions augers, core barrels, buckets and special drilling tools are used.

    Change of drilling tools

    For diverse soil conditions augers, core barrels, buckets and special drilling tools are used.

  • For drilling work with restricted headroom special short leaders are available.

    Short leader

    For drilling work with restricted headroom special short leaders are available.

  • When the torque of the rotary drive is insufficient, hydraulic casing oscillators are applied.

    Casing oscillator

    When the torque of the rotary drive is insufficient, hydraulic casing oscillators are applied.

  • Alternate rotating and shaking of the auger on the surface removes the loosened soil from the auger.

    Removal of drill cuttings

    Alternate rotating and shaking of the auger on the surface removes the loosened soil from the auger.

  • After the borehole has been produced the reinforcement cage is lifted into the borehole using the auxiliary winch of the drilling rig.

    Insertion of reinforcement cage

    After the borehole has been produced the reinforcement cage is lifted into the borehole using the auxiliary winch of the drilling rig.

  • Immediately after the reinforcement cage has been inserted the borehole is filled with concrete.

    Concreting of the pile

    Immediately after the reinforcement cage has been inserted the borehole is filled with concrete.

    • Cluster drilling

  • The cluster drill is a drilling tool for hard, compact rock or boulder with uniaxial strengths far exceeding 100 MPa.

    Cluster drill

    The cluster drill is a drilling tool for hard, compact rock or boulder with uniaxial strengths far exceeding 100 MPa.

  • Driven by compressed air several identical down-the-hole hammers achieve a high blow rate. This creates a chisel effect.

    Function of cluster drill

    Driven by compressed air several identical down-the-hole hammers achieve a high blow rate. This creates a chisel effect.

  • The crushed cuttings are collected in a calyx basket and emptied discontinuously.

    Emptying the cluster drill

    The crushed cuttings are collected in a calyx basket and emptied discontinuously.

    • Video Kelly drilling

    The video shows Liebherr rotary drilling rigs in different Kelly drilling applications.
    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.
    The video shows Liebherr drilling rigs in different Kelly drilling applications. Play video
    The video shows Liebherr rotary drilling rigs in different Kelly drilling applications.
    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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