Grab drilling

Drilling with bored pile grab

Drilling with bored pile grab

Drilling with bored pile grab
The process of installing a drilled pile using the grab excavation method includes the following steps:
1. Insertion of the casings
2. Emptying of the casings, e.g. with bored pile grab
3. Inserting the reinforcement
4. Concreting and step by step extraction of the casing
5. Finished pile

Drilling with bored pile grab is one of the oldest dry drilling methods and is still common today. Depending on the tools used, e.g. bored pile grab, chisel or special tools hanging on a duty cycle crawler crane, the soil is loosened either by cutting or impact driving. This method is applied, for instance, for well drilling with small drilling diameter or for the production of cast-in-place piles with sometimes very large diameters.

Examples for drilling with bored pile grab

  • Drilling with bored pile grab can be applied in nearly all types of soil, with or without groundwater.

    Universal drilling process

    Drilling with bored pile grab can be applied in nearly all types of soil, with or without groundwater.

  • For drilling with bored pile grab duty cycle crawler cranes of the HS series are used as carrier machines.

    Duty cycle crawler cranes as carrier machines

    For drilling with bored pile grab duty cycle crawler cranes of the HS series are used as carrier machines.

  • The bored pile grab penetrates the ground in free fall and loosens it with a combined deformation and shear movement.

    Hammer grab

    The bored pile grab penetrates the ground in free fall and loosens it with a combined deformation and shear movement.

  • The digging grab is positioned at the bottom of the borehole. The ground is loosened by closing the spherical shells.

    Digging grab

    The digging grab is positioned at the bottom of the borehole. The ground is loosened by closing the spherical shells.

  • Cased boreholes are always recommended when the building ground is not stable enough.

    Casing

    Cased boreholes are always recommended when the building ground is not stable enough.

  • Mainly casing oscillators, type VRM, are used for drilling with bored pile grab.

    Casing oscillator

    Mainly casing oscillators, type VRM, are used for drilling with bored pile grab.

  • For difficult soil conditions or long casing sections, casing rotators, type RDM, are used.

    Casing rotator

    For difficult soil conditions or long casing sections, casing rotators, type RDM, are used.

  • Compared with rotary drilling rigs, boreholes can be installed with a larger distance between carrier machine and drilling axis.

    Radius

    Compared with rotary drilling rigs, boreholes can be installed with a larger distance between carrier machine and drilling axis.

  • After the final drilling depth has been reached, the reinforcement cage is inserted and, subsequently, concrete is filled in.

    Cast-in-place pile

    After the final drilling depth has been reached, the reinforcement cage is inserted and, subsequently, concrete is filled in.

  • For drilling operations with restricted headroom, special short booms and drilling tools are available.

    Short booms

    For drilling operations with restricted headroom, special short booms and drilling tools are available.

  • Video drilling with hammer grab

    Liebherr duty cycle crawler cranes, type HS 855 HD and HS 885 HD, working with hammer grabs.
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    The video shows duty cycle crawler cranes from Liebherr in drilling operation with hammer grab at various construction sites. Play video
    Liebherr duty cycle crawler cranes, type HS 855 HD and HS 885 HD, working with hammer grabs.
    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. *Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Irland; Mutterunternehmen: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA

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