Down-the-hole 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.

Examples for down-the-hole drilling

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

    Cased down-the-hole drilling

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

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

    Discharge of drill cuttings

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

  • Video down-the-hole drilling

    An LB 20 rotary drilling rig working with a down-the-hole hammer.

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

    An LB 20 rotary drilling rig working with a down-the-hole hammer.

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