DTH Drill Excel in Hard Rock Tunnel Construction

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  1. Hard rock (over 100MPa) hinders tunnels; traditional drills struggle. DTH drill solve this with strong rock-breaking power as core equipment.
  2. Their high-frequency hammers hit over 1,500 times/min with 20kN force. Tungsten carbide bits + “impact-rotation” action boost speed by 50% vs rotary drills.
  3. Reinforced drill pipes (800MPa tensile strength) resist torque and impact. 0.7-2.5MPa air flow clears cuttings, preventing jamming.

 

In a Qinling railway tunnel, DTH drills drilled 300m/day in 120MPa quartz rock. 3% precision cut costs by 25% and lifted efficiency by 40%.