Submersible bridge

From Wikipedia, the free encyclopedia

Submersible bridge
Submerging
Ancestor Plate girder bridge,
Related Lift bridge, bascule bridge, table bridge
Descendant None
Carries Automobile, pedestrians
Span range Short
Material Steel
Movable Yes
Design effort Medium
Falsework required No

A moveable submersible bridge lowers the bridge deck below the water level to permit waterborne traffic to use the waterway. This differs from a lift bridge or  table bridge, which operate by raising the roadway. Two submersible bridges exist across the Channel of Korinth, one at each end, in Isthmia and  Korinth. They lower the centre span to 8 metres below water level when they give way to ships crossing the channel.

The submersible bridge's primary advantage over the similar lift bridge is  that there is  no structure above the shipping channel and  thus no height limitation on ship traffic. This is  particularly important for sailing vessels. Additionally, the lack of an  above-deck structure is  considered aesthetically pleasing, a similarity shared with the Chicago-style bascule bridge and  the table bridge. However, the presence of the submerged bridge structure can limit the draft of vessels in the waterway.

The term submersible bridge is  also sometimes applied to a non-movable bridge that is  designed to withstand submersion and  high currents when the water level rises. Such a bridge is  more properly called a Low water bridge

Submergence animation from this series
Enlarge
Submergence animation from this series

[edit] See also




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STATIC WIKIPEDIA JUNE 2008 on wikipedia2006.classicistranieri.com

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