Tunnel drive shield
AssigneeGewerkschaft Eisenhutte Westfalia
InventorsHans G. Follert, Klaus Linde, Hans Jutte
Life of this patent
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Abstract
A tunnel drive shield is provided with a plurality of bracing units spaced around its periphery. The bracing units are expansible against the surrounding tunnel wall to control the direction of shield advance. A bracing unit is provided in each of the four shield quadrants defined by the vertical and horizontal center planes of the shield. Each of the bracing units is expansible in a non-radial direction.
Claims7
In a tunnel drive shield having a plurality of bracing units arranged around its periphery, the bracing units being expansible against the surrounding tunnel wall to control the direction of shield advance, the improvement comprising a bracing unit provided in each shield quadrant defined by the vertical and horizontal center planes of the shield, each bracing unit expansible by control means movable in a non-radial direction, each of said bracing units positioned below the horizontal center plane of the shield controlled by means of a hydraulic ram, said ram having working stroke lying in a direction parallel to the longitudinal axis of the shield.
Dependencies are inferred from the claim text.