The boring of the Bolaños tunnel has been completed. The works have created two parallel single-track tunnels, each 6.7 km long. It reported that with an average excavation performance of 19.40 linear m/d in the first tunnel, the work took 11.5 months to complete, the boring of the second tunnel saw an average excavation performance of 24.32 linear m/d, and so the work took 9.5 months to finish.
The works use a particular innovative solution for the construction of the tunnels, that involved the application of a stabilization system for land of high geological instability.
Galbiati Group builds TBM components such as planetary gearboxes, bearing supports, erectors. The company has recently realized one 4 ton-segment erector for a Tunnel Boring Machine designed for a excavation project. For more information visit the website www.galbiatigroup.it.