Viaduct over the Marmanya river, 127m total length, placed in the High Speed Railway Line Madrid-Zaragoza-Barcelona-French border

The static scheme is the classical in railway bridges:
– The deck is a prestressed concrete continuous box beam, 2.64m constant depth, supported on reinforced concrete piers and abutments.
– Longitudinal fixed point, against horizontal actions, is placed on an abutment. The deck is transversally fixed to all piers by means of pot bearings. Reinforced concrete piers has an “I” cross section.
-It is noteworthy that the viaduct is located in an area of moderate seismic activity, with basic soil acceleration a = 0.09g, this action hasbeing decisive in the design of many elements of the structure.

The foundations of the piers should be deep, with piles of 1500mm diameter. The foundations of the abutments are footings.

The deck is built by the span by span method, on falsework supported on the ground. The concreting of cross sections was done in to two sub-phases: bottom slab + web (first phase) and second phase, top slab.