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Project Description
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. They were both built in 2005 and span two rivers: Anoia and its tributary Avernó.
The Viaduct over the Anoia River has an overall length of 342 m distributed over eight spans, the longest of which is 45 m long. The deck is a continuous post-tensioned concrete box girder with a constant depth of 3 m. Piers consist of a cast-in-place box cell with a constant 2.4 m width in the bridge direction and variable width in transverse direction and reach 22 m in height. The Viaduct over the Avernó River has an overall length of 810 m distributed over 14 spans, with a maximum length of 60 m. The deck is a continuous post-tensioned concrete box girder with a constant depth of 4 m. The piers are similar to the other viaduct’s but are 3 m wide in the bridge direction and reach 40 m in height.
All the supports have two POT bearings. One of the abutments is fixed and the rest of the supports allow longitudinal movements. The two bridges use deep foundations with cast-in-place piles socketed into rock. The piles are 2 m in diameter, with temporary steel casing.
Design/Construction Approach
The two structures were built as segmental bridges with the span-by-span method, 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 in 60 m segments. The structural analysis of the bridges considered the changing structural system during the course of construction, the movements of the form travelers and the sequence of PT stressing. The analysis included the time dependent material properties.
