Wanderabstuetzungsgeruest fuer den Ausbruch und/oder die Fertigausbauschalung von Stollen,Tunneln,Schaechten od.dgl. langgestreckten Bauwerken

摘要

A shiftable support for use in tunnels, mines and the like. A plurality of longitudinally arrayed supporting frames is connected by connecting means, which connects at least alternate ones of the frames to form them into units. Displacing means displaces the supporting frames individually or the units with reference to one another, between a supporting position and a shifting position in which the respective frames or units are advanced in forward direction. Operating means decreases the dimensions of the frames in a plane transverse to the direction of advancement preparatory to displacement to the shifting position, and increases the dimensions upon displacement from the shifting position to the support position.