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TUnIS Ring Sequencing

This system automatically calculates the optimum ring sequence for tunnel advances that include segmental lining.


The optimum ring position is a critical part of the tunnel construction process. Depending on the selected ring rotation, the next ring will have a specific build direction that should follow the shield movement to avoid damage to the exterior of the concrete segments.


Based on the ring position of the previously installed ring, TUnIS Ring Sequencing allows for predictive ring sequencing taking into account the current TBM position. It is able to cope with these requirements since it automatically uses experience made during constructions progress for future calculations. All planned restrictions to construction (e.g. cross cuts) are automatically taken into account and scheduled in an optimum way.

Similarly, tracking the ring convergence, ring planarity and centred ring installation in the tailskin is of importance.