Unguided boring

The exact alignment of the machine is very important for guided boring. The longer the jacking shaft, the more accurate the borehole, as it is possible to work with longer casings.

Protective steel piping is jacked into the ground from a launch shaft, which is correctly constructed and adjusted to the heading forces involved. The bore head loosens the earth at the drill head, which is then conveyed back to the launch shaft by the auger

When boring from a launch shaft to a target shaft, the product pipes push out the steel casings containing the auger sections. The diameter of the product pipes and of the steel casings is the same. The casings auger sections are then stored for the next drive. When working with casings with a threaded connection the product pipes can be pulled back from the target shaft by retracting the protective steel casings into the launch shaft.