New railway bridge over the river Sado
Portugal - 2010
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The railway bridge over the river Sado in Portugal - 2011. Aerial preview (photomontage) The railway bridge over the river Sado in Portugal - 2011. Cross section of the approach bridges and 3D model The railway bridge over the river Sado in Portugal - 2011. Widening of the deck at specific spans of the approach bridges adjacent to the main bridge. The railway bridge over the river Sado in Portugal - 2011. Steel structure of the approach bridge decks. Horizontal bracing and inspection walkway. The railway bridge over the river Sado in Portugal - 2011. Steel structure of the approach bridge decks from underneath. Horizontal bracing and inspection walkway. The railway bridge over the river Sado in Portugal - 2011. Main bridge. Cross sections of the deck. The railway bridge over the river Sado in Portugal - 2011. Onsite hall where deck sections are assembled. The railway bridge over the river Sado in Portugal - 2011. Main bridge. Launching 160m of the deck on temporary piers. The railway bridge over the river Sado in Portugal - 2011. Main bridge. Launching 160m of the deck on temporary piers. The railway bridge over the river Sado in Portugal - 2011. Main bridge. Cast steel pieces at the bottom sections of the hangers The railway bridge over the river Sado in Portugal - 2011. Main bridge. Spherical hinges and cast steel pieces at the bottom sections of the hangers The railway bridge over the river Sado in Portugal - 2011. Main bridge. The central part of an arche is raised into position using temporary towers, extentions of the temporary piers The railway bridge over the river Sado in Portugal - 2011. Main bridge. The outer parts of the arches are raised by rotation at the base The railway bridge over the river Sado in Portugal - 2011. Main bridge. Jointing of the three parts of the arches The railway bridge over the river Sado in Portugal - 2011. When assembled, the arches are embedded to the deck The railway bridge over the river Sado in Portugal - 2011. The railway bridge over the river Sado in Portugal - 2011. The railway bridge over the river Sado in Portugal - 2011.
Client : REFER (Rede ferroviaria nacional)
Engineering: Grid - Greisch

General Contractor(s): Teixeira Duarte
Steelwork contractors: Teixeira Duarte / Electrofer / Socometal / Amal
> Location

Description: The completion of the railway link Lisbon-Algarve requires crossing the Sado river, which flows into the Atlantic south of the capital. The topographical characteristics of the alluvial valley required the construction of two approach viaducts 1115 m and 1140 m (plate girder deck with a typical span of 45 m) leading to the 480 m long main bridge. The latter consists of three continuous Bowstrings (spans of 160 m) with a single plane of hangers on the bridge axis and a box girder deck.
The peculiarity of this structure lies in the hexagonal cross section of the arches and the structural continuity of the deck between the three bridges. All the superstructures have steel-concrete composite decks.
Located in an area of high seismicity, it is equipped with monitoring transmitters.

A comprehensive article on "The steel design for the new railway bridge over the River Sado in Portugal" can be found in Steel Construction 3 (2010), No. 4
Steelwork contractors:
Teixeira Duarte - Execution and erection methods for the viaducts and bridge decks and arches, including platforms and incremental erection devices, erection towers for the arches and all control devices during erection stages. Quality control system for steelwork and for the erection methods.
Electrofer - Steelwork for the North viaduct
Socometal -Steelwork for the South Viaduct
Amal - Steelwork for the main bridge and arches.
Pictures: Grid - Greisch
Text: © Ernst & Sohn verlagfür Architectur und technische Wissenschaften Gmbh &Co. KG, Berlin • Steel Construction 3 (2010), No. 4 / Antonios Reis, Jean Marie Cremer, Alain Lothaire, Nuno Lopes / Greisch		 back

 

 
 
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