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Upgrading

On some occasions, the objective of rehabilitation works is to increase the functionality of the underground structure or its capacity.

The most typical example would be the need of extra lanes of circulation for a road tunnel or the need of a larger diameter in order to accommodate bigger trains on a rail tunnel.

As complete closure of the tunnel is normally not possible, upgrading works are often challenging and need extensive and careful planning, logistics and specialized teams.

Even though upgrading works for tunnels demand a case-by-case analysis of the situation, some techniques that are often applied for enlarging the diameter of an existing tunnel are: