Destructive Rock Drilling

What is Destructive Rock Drilling?

Destructive Rock Drilling, also known as DTH Drilling, is a method in which hammer blows are transmitted by the drill rods to the drill bit. It may by wet percussion method, direct to hammer method or rotary method.

The DTH hammer is one of the fastest ways to drill hard rock. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by the air exhaust from the DTH hammer.

What is the process of execution?

  1. The hammer is located directly behind the drill bit. The drill pipes transmit the necessary feed force and rotation to hammer and bit, plus compressed air or fluids (water) for the hammer and the flushing of cuttings.
  2. The drill pipes are added to the drill string successively behind the hammer, as the hole gets deeper.
  3. The piston strikes the impact surface of the bit directly, while the hammer casing gives straight and stable guidance of the drill bit.

How is Destructive Rock Drilling used?

Rock Drilling/DTH Drilling is used to produce piles into rock, water wells and dewatering wells. It is also used for exploration of minerals and geothermal boreholes.

Which industries use Destructive Rock Drilling?

Civil Engineering- piling, footing and deep well boreholes Mining- drill and blast holes in open pit mining Mineral Exploration.

Some projects where we have executed Destructive Rock Drilling/DRD

  • Executed destructive rock drilling for L&T for their Delhi Metro Rail Corporation (DMRC) project.
  • Executed destructive rock drilling for Water Resources Department, Madhya Pradesh (MPWRD).
  • Executed destructive rock drilling for Afcons for their Chennai Metro Rail Project.