TyLin, which has been working on the project as a designer and construction supervisor, has posted on LinkedIn that the HK S-442 TBM broke through on the Mandri shaft last week, completing 42.5km of the 44km tunnel.
“Only a central section of 1.5km remains to be drilled, which will connect the two ends of the already operational line,” said TyLin.
The HK S-442 is an EPBM with a diameter of 12m and a length of 100m.
TyLin says that after a 10-year hiatus, excavation resumed in spring 2022, traversing different types of terrain and overcoming various geological obstacles, from the resistance and abrasiveness of massive granite in most sections, to unstable slates in an urban context like Barcelona.
UTE Túnel Mandri, a consortium of Dragados SA, Acciona, Comsa, and Sorigué, is responsible for the tunnel construction.
