Thin-walled and resource-efficient tunnel segment
In continuous tunnelling, which is being used more and more frequently, the load-bearing effect of the excavated rock material is taken over by segment rings. These rings usually consist of six to ten segments that are mainly subjected to normal forces and act as a tunnel lining in the final state. The design of the longitudinal joint is the decisive factor for the design and conception of the segments since the cross-sectional area in the joint area is reduced by about half (Figure 1). This design measure is necessary to avoid spalling at the edges and to allow the arrangement of joint seals and thus the production of a watertight structure.
Figure 1: Segment rings and detail of a conventionally reinforced longitudinal joint
Figure 2: Reinforcement concept developed at TU Wien
Figure 3: Conducted large-scale tests
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