Importance

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Abstract

A bracing device for a self-advancing shield tunnelling machine for tunnel construction comprising a control shield within which is mounted a cutting unit, and at least two bracing shields each having a closed circumferential wall construction which are connected together by feed cylinders, the bracing shields being able to be radially braced with the tunnel wall independently of each other by bracing elements fixed thereon. The bracing elements are composed of elastic pressure hoses positioned around the closed circumferential bracing shield walls. The circumferences of the bracing elements can be continually enlarged by expansion, particularly by inflation. The invention furthermore relates to the use of such bracing elements for a self-advancing shield tunnelling machine in which the control shield and the first bracing shield arranged behind it as well as the first and second bracing shield engage in each other and overlap telescopically. The first bracing shield is connected at a first end thereof to the control shield and, at a second end thereof, to the second bracing shield via independently actuatable piston and cylinder units.

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First Claim