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. 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

  • 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.

  • 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

  • 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.

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.

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