Patent ID: 6431653
Filing Date: 2002-08-13
Classification: E21D

Abstract:
Tunnel rock drill for driving a tunnel bore optionally in open or shielded mode, comprising:a drill head, a shield tail which is connected to the drill head and covers a part of the bore wall over a defined length in the shielded mode and which does not cover the part of the bore wall in the open mode, a bracing device which can be optionally fixed in the tunnel bore and which serves to divert the reaction forces generated by the tunnel bore during boring, at least one optionally activatable advancement device which, on the one hand, rests on the bracing device and, on the other hand, acts on the drill head in order to drive the drill head with advancing forces in the open mode, at least one optionally activatable force generator which has a variable length and which, on the one hand, rests on a tubbing support or an abutment for the tubbing support and, on the other hand, acts on the drill head in order to drive the drill head with advancement forces in the shielded mode, and an inner kelly whose breast-sided end bears the drill head and which can be moved in the direction of boring in relation to the bracing device by hinging the at least one advancement device to the inner kelly.