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Title: Río Deza and Anzo 2 Viaducts

Author(s): Pardo de Vera Posada, I.; Pantaleón Prieto, M. J.; Ramos Gutiérrez, O. R.; Ortega Carreras, G.; Martínez García, J. M.

Publication: ACHE

Volume: 62

Issue: 259

Appears on pages(s): 61 - 74

Keywords: incremental launching, arch, vertical rotation, prestressed concrete, segments, double varying cross section piers.


Date: 1/1/2011

The Río Deza (1.175 m long) and Anzo 2 (732,40 m long) Viaducts have been designed for a high speed railway. They consist of a box girder (4,50 m high) of prestressed concrete. The typical span, for both viaducts, is 70 m long, although the longest span of the Río Deza Viaduct is 75 m long. They were built by the incremental launching method, with a 43,50-m long nose. The deck was divided in segments of 35 m of maximum length (among the longest segments made in Spain up to date). The cross section of the piers is octogonal and has a linear variation of its transverse and longitudinal dimensions in those piers taller than 50 m. The tallest pier in Anzo 2 is 70 m high, whereas the tallest one in Río Deza is 96,50 m high. The Río Deza Viaduct crosses it at a height of more than 100 m by means of a 131,50-m span pointed arch. The erection procedure used in the construction of the arch was the vertical rotation method. For this purpose the two half leaves of the arch were built in vertical position and then moved to position and met at the closure. It is the third longest arch built in the world by this method.

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