Pressure drill rod for pressure drilling plant uses hollow drill rod elements for providing light path between target light at drill head and camera at drilling drive end enclosed by fluid channel supplying fluid jets

摘要

The pressure drill rod (7) has at least one releasable hollow drill rod element (9) inserted between the drilling drive (6) and the drill head (8), for providing a light path between a target light (11) supplied by a light source (10) in the drill head and a camera (12) in the drilling drive, enclosed by a fluid channel for supplying fluid jets incorporated in the drill head.