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  The construction of tunnels for the Américo Vespucio Oriente 1 project in Santiago de Chile

  The "Américo Vespucio Oriente Concession, Section Av. El Salto-Príncipe de Gales" (AVO I) is part of the ambitious publicprivate partnership program, promoted by the Chilean Government, through the Ministry of Public Works, to close the Américo Vespucio Ring Road to highway standard in Santiago de Chile. AVO I will be finally completed, after a decade of analysis, incorporated in its design part of the demands and interests of the community in its area of influence, work with municipalities and civil society organizations that continues to this day. The project addresses the challenge of integrating into an urban space a subway highway with three lanes in each direction, with a trunk length of 8,278 m, of which 7,678 m run in tunnels. Considering also the length of the connecting branches, the project involves a total of more than 10 km of urban tunnels that are excavated mainly in the alluvial gravels of the Mapocho River. Sociedad Concesionaria Vespucio Oriente S.A. - formed by ALEATICA, S.A. and SACYR Concesiones Chile, Spa - is in charge of building the new expressway, which will benefit more than 50,000 thousand daily users by reducing travel times between the municipalities of Huechuraba and La Reina from 40 to 10 minutes at peak hours. In addition, the Vespucio Park will be redesigned, revitalizing this green area for all the inhabitants of the city of Santiago. AVO I, whose construction contract is being undertaken by SACYR and OHL, is undoubtedly the most important public infrastructure initiative underway, not only because of its magnitude, but also because it combines a series of construction methods: viaduct, covered trench tunnel, mine tunnel and hybrid tunnel. Subterra Ingeniería is in charge of the engineering and technical assistance for the latter. The expressway works started in November 2017 and are scheduled for completion in July 2022.

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