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Leader

Casing shoe with ring bit

Leader top for auxiliary rope

Rotary drive

Casting tube

<h2>DTH hammer drilling</h2>

<p>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.</p>

<h3>Process principle of cased DTH hammer drilling</h3>

<p>1. Setting the DTH hammer with drill rod and casing on the drilling point.</p><p>2. Rotary and percussive drilling of the drill string under compressed air supply.</p><p>3. After reaching the final depth, unlocking of the drill rod with DTH hammer and pilot bit.</p><p>4. Withdrawal of the drill rod, DTH hammer and pilot bit out of the casing.</p><p>5. Completed cased borehole.</p>

<h2>Video: Down-the-hole drilling</h2>

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

<h3>Cased down-the-hole drilling</h3>

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

<h3>Discharge of drill cuttings</h3>

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

<h2>Video: LB 16 unplugged DTH drilling</h2>

<h2>Machines</h2>

Spezialtiefbau

LRH-Serie

(not set)

LB-Serie

<h2>Get in touch</h2>

<p>If you have any further questions, please contact our local sales or service team.</p>

Solutions for deep foundation work

Info flyer Compendium deep foundation part 1: Drilling

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<h1>Down-the-hole drilling</h1>

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