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Life Upper Intermediate - National Geographic
Tipologia: Appunti
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Unit 5f – Scandinavian mega-bridge
Part 1
What’s it takes to build one of the world’s mega bridges?
In northern Europe, the Baltic Sea converges with the North Sea at the Øresund Strait. It’s ten miles wide with lousy weather. And it’s done a great job of keeping Denmark separate from Sweden.
The Øresund Strait is a frustrating barrier because each shore has something the other needs. Copenhagen, Denmark, needs cheaper housing. Malmö, Sweden, needs more jobs. Connect the dots and you could unleash an economic powerhouse. A bridge would make them one big metropolis, but it’s never been possible. Until now.
Enter the Øresund Bridge. The world’s longest cable-stayed bridge that can carry cars plus the enormous weight of trains. 3,583 feet of road and rail dangling from 160 cables.
Two hundred feet above the sea, the support towers soar 670 feet, jabbing at clouds and making the Øresund Bridge one of the tallest cement structures in Sweden.
Part 2
Companies from both countries must form a consortium to build the bridge together. The consortium’s first challenge: figuring out how to build a bridge ten miles long. Immediately, they face a dangerous setback. On the Denmark side, right at the shoreline, is the Copenhagen international airport, Kastrup. Computer simulations show that building a bridge with high towers would obstruct air traffic … or worse. A low bridge would be safer for air traffic, but it would block Denmark’s ship traffic.
When engineers can’t build over the water, they consider building under it, with a tunnel ten miles long.
Peter Lundhus That would be the beautiful solution, building a tunnel from one side to the other, but that would be the expensive solution. So the third solution that we decided was, of course, to build part-bridge and then a tunnel where we were getting close to the airport. A bridge would have been easier or cheaper, but would not have been a good idea for the aeroplanes.
Somewhere, they need dry land for the tunnel to emerge from under water. They need an island, so they’ll have to build one, from scratch.