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Fifteen Eyes Viaduct A-6 Motorway


The structure is located on the Arquitecto López Otero Street in city of Madrid and it supports the traffic of the A-6 Motorway. This viaduct was designed by the engineer Eduardo Torroja and it was built between the years 1929-1933. It has 130 m length and 25 m width. The viaduct consists of 15 spans of 7 m and transversally has three arches. Nowadays only two of its arches are accessible to the road and pedestrian traffic, those ones which have been restored in 2014.

The structure actually works as a girder bridge, due to the cantilever semiarches supported by pilasters of 1.70 mx 1.70 m.

Originally the heights were up to 20 m, nowadays the grade has change and they do not reach more than 7 m, because in the sixties Cantarranas Stream was filled up.

The main damages, which were found on the deck, consist of the lost of the cover and the concrete beams (due to aging process and climatic action); moisture and efflorescence in beams, slabs and braces (due to the water leaking from the deck); and the reinforcement has lost its concrete cover due to corrosion.

In the piers moistures and efflorescence have been detected, due to the bad waterproofing of the deck as well as the lost of cover, which suppose an important section loss up to 20 cm.

Likewise, in the abutments and wing-walls there were also moisture and lost of cover. Moreover in one of the front walls existed cracks both in vertical and horizontal direction.


A general cleaning was carried out by brushing and blowing air but at controlled pressure because the original concrete, from 1930, was very deteriorate and not very reinforced, besides its low cement content.


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