These two viaducts are part of the high speed rail (HSR) segment linking Madrid and Barcelona. Both structures cross the Anguera River and its potential flooding area in Montblanc. The overall length of the first viaduct is 3,031 ft (924 m) and consists of 28 equal simply supported spans of 112 ft (34 m) in length. The second viaduct has a total length of 2,139 ft (652 m) and consists of 19 equal spans. 16 of the spans are simply supported and 112 ft in length, and 3 spans are a continuous girder with a maximum length of 138 ft (42 m). Each span is horizontally fixed in the longitudinal direction at one of the ends with a fixed POT bearing. The piers are very stiff with heights of approximately 33 ft (10 m) and two shafts.
The bridges’ superstructures consist of 46 ft (14 m) wide reinforced concrete castin-place slabs on top of two pre-stressed concrete U-shape precast girders with a depth of 8 ft (2.45 m). This configuration facilitated the erection of the deck with crawled cranes and accelerated the construction time.
The 3-span continuous bridge is made of the same typical U-girders as the rest of the viaduct. The girders become continuous for both permanent and live loads through a connection with pre-stressing bars.
These long viaducts proved that the use of pre-cast elements led to significant cost savings as a result of the industrialized fabrication and erection methods.
A dedicated temporary precast yard was built to fabricate the precast U-girders. The reinforced top slab was cast-in-place using a light moving falsework with a 5-day construction cycle.
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.