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Monday 28 May 2012

Golden Gate Bridge 75th Aniversary

The Golden Gate Bridge is a famous suspension bridge in California, USA. It joins the city of San Francisco with the Marin Peninsula.

They started to build it on January, 1933 and finished on May the 27th 1937. It was built in a dangerous place. San Francisco is near a fault line, so there is always the danger of earthquakes.

Animation of Golden Gate Bridge construction: 1. Anchor points are placed either side of span and foundations for the two support towers are placed in the ground under the sea. 2: Two support towers were put up on the foundations, and the main cable was attached to the top of the towers and to the anchor points at each end of the span. 3: Working from both ends of the bridge, stringers were hung from the main cable, each supporting a little bit of the flat deck, until they met in the middle, completing the bridge. by skyriders.com
 
To build a base for the tower, the bridge builders needed to work 30 metres below the ocean surface. They made a huge box that reached from the surface down to the ocean floor. Then they pumped the sea water out so that they could make the concrete base for the tower.o the bridge. They had to be made by machines that were right next to the bridge and then pulled across the two towers.
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2 comments:

  1. Anonymous3 June 2012 at 23:58

    I have been there, it's very big

    ReplyDelete
  2. Miguel Jorge Damas7 June 2012 at 18:08

    ¡¡¡¡¡¡¡VALLADOLID HAVE 10 BRIDGES!!!!!!!

    ReplyDelete

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