VORTRIEBSMASCHINE FUER DAS AUFFAHREN VON TUNNELN, STOLLEN U.DGL.

摘要

A tunnel driving apparatus employs a cutting head supported by an undercarriage disposed within a hollow shield. The undercarriage is slidably suspended on elongate support arms which are pivoted to rocker arms which in turn are also pivoted to the shield. The support arms and rocker arms are raisable and lowerable at their rear ends with the aid of piston and cylinder units. Pivoting of the support arms serves to alter the angular disposition of the cutting head and pivoting of the rocker arms serves to displace the pivotal axis of the support arms to vary the height of the cutting head.