ABSTRACT
ABSTRACT: The Tagus Crossing at Carregado in Portugal is located in the Tagus river alluvial valley, which is one of the most fertile Portuguese agricultural areas. The crossing is approximately 11,700 m long, carrying a double 3 lane carriageway with 30 m of total width. It is made of three main structures: the 1700 m long North Viaduct, the 970 m long Tagus Bridge and the 9200 m long South Viaduct. Additionally to these main structures the environmental sensitivity of the agricultural ground occupation imposed the construction of a set of significant complementary works: an 8 m wide 9200 m long side road along the South Viaduct to serve the construction site, including 18 pontoons to overcome local waterlines, dikes and irrigation existing infrastructures. In this paper a description of the project is made with emphasis in the design and construction aspects associated with the limitation of impacts on the adjacent sensitive environment.
