HORIZONTAL AUGER BORING WITH DOWN-THE-HOLE HAMMER
The Down-The-Hole Drill is basically a mini jackhammer that screws on the bottom of a drill string. 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 for the hammer and flushing of cuttings. The drill pipes are added to the drill string. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by the air exhaust from the DTH hammer.
Sztriberny Company video
