Did you know? - The Lezíria bridge over the Tagus river |
The Lezíria Bridge crosses the Tagus River near the city of Carregado, connecting the A10 motorway to the west and the A13 motorway to the east. BRISA, the concessionaire for these motorways, launched the Design/Build tender for the construction of the bridge. COBA led the design consortium, initiating the Detailed Design phase in 2004 and completing it in 2007 with the conclusion of the construction works. During this period, Technical Assistance was provided concurrently with both the design and construction phases. The bridge, with a total length of 11,900 meters and a width of 30 meters, consists of three main components: the North Viaduct, the Bridge over the Tagus River, and the long South Viaduct, which spans the alluvial plain. The foundations of the viaducts consist of pier piles with a diameter of 1.5 meters, while the bridge foundations are made up of 2.2-meter-diameter piles, reaching depths of over 50 meters. The Lezíria Bridge: Length: 11.900 m Width: 30 m Main Structures North Viaduct: 1.700 m Bridge over the Tagus River: 972 m South Viaduct: 9.230 m The construction of the Bridge over the Tagus River was executed using the cantilever method, with a cast-in-place box girder deck and typical spans of 130 meters. The North Viaduct was primarily built with a launching girder and a deck composed of ribbed slabs, featuring typical spans of 33 meters. The South Viaduct construction involved a deck made of U-shaped beams and precast slabs, with typical spans of 36 meters. Given the project's importance and scale, it was supported by an architectural study and a landscape integration plan, focused on creating a cohesive design for the three structures that form the crossing. |
Lx, 22 January 2025
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