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HSR Viaduct over the “Tinto” River
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DESCRIPCION

The viaduct over the River Tinto is a part of the high-speed line between Seville and Huelva.
The singularity of the river, protected by an Environmental Impact Statement, and a hydraulic study, lead us to an elevated structure of 1059 m, with a main-span of 150m.
The central spans are distributed in a sequence of 63+102+150+102+63m. The composite truss is the chosen typology for the three central spans, while the other ones, are resolved with composite sections of closed box and concrete slab.
The access bridges are made on prestress-concrete and its spans are around 32 and 54 meters.
The proposed triangular truss reach a maximum depth of 12 meters in the piles, and his minimum is 5 m in the midpan.
The transition spans of 63 meters are materialized with a variable depth composite section  from 3.5 m to 4.8 m.
 
It was developed a double composite action not only in the supports, but also in the lower elements of the truss which are near from the piles.
The access viaducts, which are 603 m of the total length, have a concrete box section 3.75 m depth. The construction procedure is the movable falsework.
The system of supports against horizontal loads and seism, is composed by POT supports in the piles and the abutments, with two lengthwise dumpers of 5000kN in the abutment for taking all the seism and braking loads, and neoprene bearings in 6 intermediate piles from the 17 totals to resist the slow loads.
 
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