Els Túnels ferroviaris a la collada de Toses Authors Josep Suriol Castellví Abstract 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 rocks 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. Downloads Text complet (Català) Published 2010-04-29 Issue Nova època, vol. 2 (2) : 2009 Section Articles License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Actes d’Història de la Ciència i de la Tècnica, authors accept the following terms:Authors assign to Societat Catalana d’Història de la Ciència i de la Tècnica (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Actes d’Història de la Ciència i de la Tècnica.Authors answer to Societat Catalana d’Història de la Ciència i de la Tècnica (SCHCT) for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.SCHCT declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at http://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.Actes d’Història de la Ciència i de la Tècnica is not responsible for the ideas and opinions expressed by the authors of the published articles.