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HSR “Zadorra” Viaduct
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DESCRIPCION

The viaduct over the A-3002, N-I and Zadorra River, is part of the project: Vitoria - Bilbao - San Sebastian High-Speed Railway Spanish line.
This viaduct has a total length of 463 meters, divided into six spans distributed as follows, 64.5 +2x85.5 +77.5 +85.5 +64.5 m. This longitudinal span scheme is conditioned by having to cross, with a large skew, the N-I, A-3002 and Zadorra River, involving as long spans as 85 m, rare in structures of high-speed railway.
The fact that serves a two-way line, determines the width of the deck, which is of 14 m.
The deck is initially resolved by a hollow box section of pre-stressed concrete with a single cell and constant depth in all spans, except in pier support, in which a linear variation of depth is planned, from the 3.00 m deck in the constant region to the 6.60 meters on the pier support.
 

On one hand, the Environmental Impact Statement did not allow the use of temporary supports in the river Zadorra crossing, and on the other hand, having to cross the N-I Highway obliged to affect the heavy traffic as little as possible. Therefore the pre-stressed concrete box section was replaced in the mentioned crossing obstacles of the river Zadorra and road N-I, by a composite section to ease its erection. These spans follows therefore a hybrid solution that combines in one structure, the types of pre-stressed concrete and composite deck, in the main spans, which is entirely a new solution in rail infrastructure for high-speed lines.
The construction process consists in the execution of the concrete spans in phases, with complete span false-work for the deck, and erection of the composite spans with the help of cranes.
The piers have a strong profile, with a shaft that is divided into two parts, with the tucked bottom-section type bow, and a tapered central element in height. The pier is finished with a diamond-shaped capitol top.
As the piles, the abutments will be regarded from the N-I and from a pathway beside the Zadorra River, so they had been designed to detail, playing with the volumes and the textures of the concrete, with an almost sculptural result. 
 

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