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  The construction of the hydroelectrical project Renace II (Alta Verapaz, Guatemala)

  The hydroelectrical project Renace II is located at Cahabón River, in the Alta Verapaz Department, Guatemala The owner is Recursos Naturales y Celulosas, S.A. (RENACE, S.A.) that is part of Corporación Multinversiones, and the construction contract was awarded to COBRA Infraestructuras Hidráulicas. Renace II will provide 112 MW using a gross head of 335 m and a flow of 40 m3/s. This paper aims to summarize the main aspects of the design process that have been car-ried out for the underground works involved in the project. Also the main aspects of the construction phase are shown. The main difficulty has been the intersection of the tunnels with cavities originated by karstic processes in the limestones of the Coban Formation. The construction method and the equipment used are providing good advance rates and optimum safety condition in the excavation and support of a large underground project.

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