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.

  • Leader top for auxiliary rope

  • Rotary drive

  • Leader

  • Casting tube

  • Casing shoe with ring bit

        
    
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Video: Down-the-hole drilling

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

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Video: LB 16 unplugged DTH drilling

Machines

LB 16 unplugged Drilling rig

Highlight LB 16 unplugged
  • Operating weight 55.0 t
  • Max. torque 180 kNm
  • Kelly drilling, max. drilling depth 34.5 m
  • Kelly drilling, max. drilling diameter 1,500 mm
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LB 20.1 Drilling rig (LB series)

New LB 20.1
  • 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
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LB 25 Drilling rig (LB series)

New LB 25
  • Operating weight 69.3 - 79.9 t
  • Max. torque 252 kNm
  • Kelly drilling, max. drilling depth 47.1 m
  • Kelly drilling, max. drilling diameter 3,300 mm
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LB 30 Drilling rig (LB series)

New LB 30
  • Operating weight 74.0 - 84.6 t
  • Max. torque 297 kNm
  • Kelly drilling, max. drilling depth 65.2 m
  • Kelly drilling, max. drilling diameter 3,400 mm
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LB 35 Drilling rig (LB series)

New LB 35
  • Operating weight 95.2 - 111.5 t
  • Max. torque 347 kNm
  • Kelly drilling, max. drilling depth 77.5 m
  • Kelly drilling, max. drilling diameter 4,100 mm
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LB 45 Drilling rig (LB series)

New LB 45
  • Operating weight 112.4 - 131.7 t
  • Max. torque 450 kNm
  • Kelly drilling, max. drilling depth 95.0 m
  • Kelly drilling, max. drilling diameter 4,500 mm
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