These two similar bridges are located in the Municipality of Sant Sadurní d’Anoia as part of the High-Speed Rail line connecting Madrid and Barcelona. The Viaduct over the Avernó River has an overall length of 2,657 ft (810 m). The deck is a continuous post-tensioned concrete girder with 14 spans, each with a maximum length of 196 (60 m) and 13 ft (4 m) in depth. Piers consist of a cast-in-place box cell 9 ft (3 m) wide with a variable width and reach 131 ft (40 m) high.
The Viaduct over the Anoia River has an overall length of 1,122 ft (342 m). The deck is a continuous post-tensioned concrete girder with 8 spans having a maximum length of 147 (45 m) and 9 ft (3 m) in depth. Piers consist of a cast-in-place box cell 8 ft wide (2.4 m) with a variable width and reach 72 ft (22 m) high. The two bridges use deep foundations with cast-in-place piles socketed into rock. The piles are 6 ft (2 m) in diameter, with temporary steel casing. All the supports have two Pot-bearings. One of the abutments is fixed and the rest of the supports allow longitudinal movements.
The structural analysis of the bridges considers the changing structural system during the course of construction, the movements of the form travelers and the sequence of PT stressing. The analysis includes the long term time dependent materials’ properties.
These segmental bridges are built span-by-span using a self-propelled traveler formwork. This erection method reduces the environmental impact and does not interrupt existing traffic underneath. The box girder was poured in two stages to allow the use of existing traveler form equipment designed for a lighter weight and leading to significant construction savings. The typical cycle operation was 14 days per segment 196 ft (60 m).
J.A. Sobrino -“Bridges for high speed railways. Chapter 6 Bridges for the high speed railway lines in Spain. Design criteria and case studies”. CRC Press/Balkema, 2009, ISBN: 978-0-415-47147-3, Eds.: Rui Calcada, R. Delgado A. Campos e Matos.