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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.

  • 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

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