Revistes Catalanes amb Accés Obert (RACO)

Els Túnels ferroviaris a la collada de Toses

Josep Suriol Castellví

Resum


At the beginning of the 20th century, and within the train network connecting
to France, there was a project to extend the train network Barcelona-Ripoll
to Ribes de Freser and from there, crossing the Toses pass, to Puigcerdà in order to
finally reach France. To overcome the Toses pass, two tunnels were excavated:
a 1.057 m helicoidally tunnel and a 3.904 m rectilinear one. The tunnel of Toses
presented significant difficulties, especially at heights ranging 1.700-1.800 m from
the entry (at Ribes? side). Further to the lining initially planned, the stresses generated
were greater than the rock?s strength. Thus, to solve the difficulties it was necessary
to modify the excavation method, initially the Belgium system, and to coat
the tunnel by over excavating the gallery and using linings of up to 3 m wide.
Drilling started in September 1911 and ended in February 1919.

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