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Table bridge

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Table bridge
Animation of operation
Animation of operation
AncestorPlate girder bridge,
RelatedLift bridge, bascule bridge, submersible bridge
DescendantNone
CarriesAutomobile, pedestrians
Span rangeShort
MaterialSteel
MovableYes
Design effortMedium
Falsework requiredNo

A table bridge is one of the types of moveable bridge in which the deck moves vertically. Two or four hydraulic pillars under the bridge, one or two at each end, raise the bridge deck to allow boat traffic to pass beneath it.[1] In contrast to a lift bridge, where the deck is pulled upwards along towers, the deck of a table bridge is pushed upwards by otherwise hidden pillars.[2] The name originates from the fact that when open it resembles a table.

The total space required by a table bridge is hardly larger than the bridge deck, which is not the case with a thrust bridge. Unlike a lift bridge this type has only slight visual impact upon its surroundings when closed for use by road traffic. This is very well demonstrated by the Pont levant Notre Dame at Tournai in Belgium.

Examples of table bridges

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Several rivers and waterways are home to multiple examples of table bridges. These include but are not limited to:

A table bridge in operation

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Three views of the Pont levant Notre-Dame on the Scheldt River at Tournai, Belgium

Left: Looking across the Pont levant Notre Dame (in front of the first row of buildings); Center: Seen from the same viewpoint, the bridge is up; Right: Overlooking the canalized river, a self-propelled canal boat passes
Left: Looking across the Pont levant Notre Dame (in front of the first row of buildings); Center: Seen from the same viewpoint, the bridge is up; Right: Overlooking the canalized river, a self-propelled canal boat passes

See also

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References

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  1. ^ "7 Types of Bridges Every Engineer Should Know About". Enerpac Blog. 2021-09-09. Retrieved 2024-06-08.
  2. ^ Pisani, Marco A.; Ballio, Francesco (October 2010). "Feasibility analysis of a movable bridge compensating for clearance deficit during floods". Engineering Structures. 32 (10): 3338–3343. doi:10.1016/j.engstruct.2010.07.007. ISSN 0141-0296.