This week the execution of the first span of the central concrete box-girder of the Sabiñánigo Viaduct (structure E-4) over the Gállego and Aurín rivers on the Mudéjar Highway (A-23), in Huesca, Spain, has been completed.
The Viaduct is 933.7 m long, 25.10 m wide and has a span distribution of 9×90+74+49.70 m. The deck is materialized by a large post-tensioned concrete box-girger with variable depth and wide lateral overhangs that are supported by a series of precast concrete lateral struts. The large lateral overhangs of the cross section will be executed in the second phase by using a wing traveller.
The large lateral span 1 of 90 m, the last to be executed, is conditioned by the location of the Gállego river and the steep slope located next to abutment 1, and the 90 m typical spans represent the world record for the deck executed by means of a M.S.S., equaling the span reached on a viaduct on the Ankara-Kirikkale high-speed line in Turkey.
The work is being carried out by the JV Rover Grupo–Grupo Aldesa for the Ministerio de Transportes, Movilidad y Agenda Urbana, the supplier and responsible for the execution of the deck woth the M.S.S. for the JV is Grupo TecoZam, and IDEAM SA has carried out the detailed design for the JV and is providing Technical Assistance during execution.
In a short time, the M.S.S. will advance and the execution will begin with a certain offset of the cantilevers with the wing traveller.
(Pictures courtey of the JV)