Digging device of the mole type designed for boring out a tunnel of small diameter

摘要

The present invention relates to a digging device of the mole type, especially for boring out a tunnel of small diameter. This device is characterised in that it comprises a digging means (6) capable of rotating with a high torque, means (B) for removing the broken up earth in order to form a mud (slurry) with the broken up earth and for removing the muddy earth by means of compressed air, a drive unit (14) for displacing the digging means (6) forwards or backwards, a position-detecting means (11, 12, 1) for detecting the vertical position, the horizontal position, and the angle of the direction of digging of the digging means, and a direction-correcting means (5) for correcting the direction of digging of the digging means (6). IMAGE