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Ponte da Arrábida em primeiro plano e a Ponte D. Luis I em segundo plano.

The Arrábida Bridge on the foreground and the Ponte D. Luis I on the background.



A Ponte da Arrábida é uma ponte em arco sobre o Rio Douro que liga Porto (pela zona da Arrábida) a Vila Nova de Gaia (pelo nó do Candal), em Portugal.
No tempo da sua construção em 1963, a ponte tinha o maior arco em betão armado de qualquer ponte no mundo.
O comprimento total da plataforma é de 615m, tendo uma largura de 27m. O seu vão de 270 m, e 52 m de flecha, arco esse constituído por duas costelas ocas paralelas, de 8 m de largura ligadas entre si por contraventamento longitudinal e transversal.
O engenheiro responsável pelo seu projecto e construção foi Edgar Cardoso.

A Ponte D. Luís I foi construída com estrutura metálica, entre os anos 1880 e 1887, ligando as cidades do Porto e Vila Nova de Gaia (margem norte e sul respectivamente) separadas pelo rio Douro, em Portugal.
Esta construção veio substituir a antiga ponte pênsil que existia no mesmo local, e, foi realizada mediante o projecto do Engenheiro belga Teófilo Seyrig, também autor da Ponte Dona Maria.

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The Arrábida Bridge is an arch bridge over the Douro River that connects Porto to Vila Nova de Gaia, in Portugal. It is the most downstream bride across the Douro River, just a few kilometers from the Atlantic Ocean.
At the time of its construction in 1963, the bridge had the largest concrete span of any bridge in the world. The total length of the tray is of 615m, having a width of 27m. The arch is 52m tall and the plate rises up to 70m above water level.
The engineer responsible for its project and construction was Edgar Cardoso.


The Luís I Bridge (Ponte Luís I) is a metal arch bridge that spans the Douro River between the cities of Porto and Vila Nova de Gaia in Portugal. At the time of construction its span of 172 m was the longest of its type in the world.
The Government held a competition for the construction of a metallic bridge over the Douro River on a site that was adjacent to an existing bridge and would replace it. Téophile Seyrig had already engineered the D. Maria Pia Bridge project nearby, whilst working as a partner of Eiffel. He now took sole responsibility for the new, major Luís 1st Bridge. The construction was begun in 1881 and the bridge opened on 31 October 1886.
Originally built to take road traffic on both decks, at various times it saw trams on the upper and trolleybuses on the lower. The top deck is now occupied by Line D of the Metro do Porto and a pedestrian walkway.
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Additional Photos by Ana Rita (AnaRita) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 136 W: 71 N: 204] (1741)
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