Cutting shoe for pressure drilling installations for the trenchless laying of pipelines or the like

摘要

A controllable cutting shoe for inaccessible pipe diameters for mainly horizontal pressure drilling installations is described, the swivelling of the cutting shoe being effected via a pipe which lies in the interior of the drill pipe and slides on its inner circumferential surface, and the cutting shoe lying via swivel bearing in the front end of the front section of the drill pipe, which is coupled to the rest of the drill pipe via a sliding bearing. The inner pipe is coupled to the cutting shoe so that the cutting shoe can be controlled, i.e. rotated and swivelled, by a reciprocating movement and by a rotary movement of the inner pipe.