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Friday, 6 April 2012

Oresund

At almost 8km the bridge covers half the distance between Sweden and the Danish island of Amager - the border between the two Countries being located just over 5 km from the Swedish end it has a mass of 82 kilotonnes and supports two railway tracks beneath four road lanes in a horizontal girder extending along the entire length of the bridge. On both approaches to the three cable-stayed bridge sections, the girder is supported every 140 m by concrete piers. The two pairs of free-standing cable supporting towers are over 200 m high allowing shipping 57 m head room under the main span. Even so, most ship's captains prefer to pass through the unobstructed Drogden Strait above the Drogden Tunnel. Its 491 m cable-stayed main span is the longest of this type in the world. A girder and cable-stayed design was chosen to provide the rigidity necessary to carry heavy rail traffic, and also to resist large accumulations of ice. The bridge joins the Drogden tunnel on the artificial island christened Peberholm approximately 4 km long, with an average width of 500 metres. The connection between the artificial island of Peberholm and the artificial peninsula at Kastrup on Amager island – the nearest populated part of Denmark – is through the Drogden Tunnel. The 4,050 m long tube tunnel is made from 20 prefabricated reinforced concrete segments – the most massive in the world at 55,000 tonnes each – interconnected in a trench dug in the seabed. Two tubes in the tunnel carry railway tracks; two more carry roads while a small fifth tube is provided for emergencies. The tubes are arranged side by side.

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