Steering mechanism for a subsoil boring apparatus.

摘要

In an apparatus (10) for creating an underground bore hole using high-pressure fluid within a steerable drill string (18) to disturb and displace the subsoil, the improvement of the steering capability of the boring head (20) by the inclusion of a percussive device (72) to hammer the drill string (18) forward after the desired steering of the boring head (20) has taken place to cause the boring head (20) to fully engage the media being bored so that upon resumption of normal rotary drilling the boring head (20) will proceed in the selected path. <IMAGE>