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Down-the-hole drilling

DTH hammer drilling

In down-the-hole drilling a drill rod is fitted with a hammer at its lower end. The hammer, which is mounted on the drill bit, is activated through the addition of compressed air and driven into the ground – simultaneously rotating and impacting. A flushing current collects the loosened drill cuttings and conveys them upwards. This method is mainly applied for hard to very hard rock and/or for penetrating large boulders.

Process principle of cased DTH hammer drilling

1. Setting the DTH hammer with drill rod and casing on the drilling point.

2. Rotary and percussive drilling of the drill string under compressed air supply.

3. After reaching the final depth, unlocking of the drill rod with DTH hammer and pilot bit.

4. Withdrawal of the drill rod, DTH hammer and pilot bit out of the casing.

5. Completed cased borehole.

Video: Down-the-hole drilling

The video shows the down-the-hole drilling method for very hard soil or rock.

This video is provided by Google*. When you load this video, your data, including your IP address, is transmitted to Google, and may be stored and processed by Google, also for its own purposes, outside the EU or the EEA and thus in a third country, in particular in the USA**. We have no influence on further data processing by Google.

By clicking on “ACCEPT”, you consent to the data transmission to Google for this video pursuant to Art. 6 para. 1 point a GDPR. If you do not want to consent to each YouTube video individually in the future and want to be able to load them without this blocker, you can also select “Always accept YouTube videos” and thus also consent to the respectively associated data transmissions to Google for all other YouTube videos that you will access on our website in the future.

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For further information, please refer to our Data Protection Declaration and the Google Privacy Policy.*Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland; parent company: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA** Note: The data transfer to the USA associated with the data transmission to Google takes place on the basis of the European Commission’s adequacy decision of 10 July 2023 (EU-U.S. Data Privacy Framework).

Cased down-the-hole drilling

A rotary drilling rig, type LB 20, working with down-the-hole hammer inside a casing.

Discharge of drill cuttings

A flushing current conveys the loosened drill cuttings upwards and exits at the upper end of the casing.

Video: LB 16 unplugged DTH drilling

This video is provided by Google*. When you load this video, your data, including your IP address, is transmitted to Google, and may be stored and processed by Google, also for its own purposes, outside the EU or the EEA and thus in a third country, in particular in the USA**. We have no influence on further data processing by Google.

By clicking on “ACCEPT”, you consent to the data transmission to Google for this video pursuant to Art. 6 para. 1 point a GDPR. If you do not want to consent to each YouTube video individually in the future and want to be able to load them without this blocker, you can also select “Always accept YouTube videos” and thus also consent to the respectively associated data transmissions to Google for all other YouTube videos that you will access on our website in the future.

You can withdraw given consents at any time with effect for the future and thus prevent the further transmission of your data by deselecting the respective service under “Miscellaneous services (optional)” in the settings (later also accessible via the “Privacy Settings” in the footer of our website).

For further information, please refer to our Data Protection Declaration and the Google Privacy Policy.*Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland; parent company: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA** Note: The data transfer to the USA associated with the data transmission to Google takes place on the basis of the European Commission’s adequacy decision of 10 July 2023 (EU-U.S. Data Privacy Framework).

Machines

Results 1-6 of 11
metricimperial
  • Operating weight - 59.4 t

  • Max. torque - 180 kNm

  • Kelly drilling, max. drilling depth - 34.5 m

  • Kelly drilling, max. drilling diameter - 1,500 mm

  • Operating weight - 52.8 t

  • Max. torque - 200 kNm

  • Kelly drilling, max. drilling depth - 34.5 m

  • Kelly drilling, max. drilling diameter - 1,500 mm

  • Operating weight - 69.3 - 79.9 t

  • Max. torque - 252 kNm

  • Kelly drilling, max. drilling depth - 53.2 m

  • Kelly drilling, max. drilling diameter - 3,300 mm

  • Operating weight - 71.1 - 82.1 t

  • Max. torque - 252 kNm

  • Kelly drilling, max. drilling depth - 53.2 m

  • Kelly drilling, max. drilling diameter - 3,300 mm

  • Operating weight - 73.6 - 84.6 t

  • Max. torque - 297 kNm

  • Kelly drilling, max. drilling depth - 70.8 m

  • Kelly drilling, max. drilling diameter - 3,400 mm

  • Operating weight - 75.5 - 85.5 t

  • Max. torque - 297 kNm

  • Kelly drilling, max. drilling depth - 70.8 m

  • Kelly drilling, max. drilling diameter - 3,400 mm

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