The Abroñigal viaduct, which will serve the HSRL nearby Atocha Station (Madrid) runs parallel to the C-4 (Suburban) railway.
The structure must save first, the tracks entering Santa Catalina Station, crossing them in a skewed way.
The viaduct has got a length of 144.5 m measured between bearings in both abutments, distributed in three spans: 45.5+53.5+45.5 m, that are determined by the rail tracks that must be over crossed.
The crossover is achieved with a strict vertical clearance, thanks to an upper structure, which consists of two steel parallel frames that suspend a composite deck. This is a technical and constructive effective solution, aesthetically pleasant, being this last characteristic very important due to the prominent position and urban nature of the area where the viaduct is located.
The steel members of the viaduct allow a quick erection, minimizing the railway traffic interruptions in the existing railway tracks placed below the Abroñigal viaduct.
The chosen design is effective in a constructive and technical way, being also aesthetically attractive, which is very important according to the area where it’s located.
The transversal diaphragms are placed every 3 meters along the edge, and support the concrete slab, which has a constant depth of 33 cm.
The ties, as the inclined masts, are materialized by steel box-section elements with transversal unions on the top.