Animation of operation  | |
| Ancestor | Plate girder bridge, |
|---|---|
| Related | Lift bridge, bascule bridge, submersible bridge |
| Descendant | None |
| Carries | Automobile, pedestrians |
| Span range | Short |
| Material | Steel |
| Movable | Yes |
| Design effort | Medium |
| Falsework required | No |
A table bridge is a moveable bridge in which the deck moves along the vertical axis. Four hydraulic pillars under the bridge, two at each end, raise the bridge deck to allow barge traffic to pass beneath it. 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. 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
Several rivers and waterways are home to multiple examples of table bridges. These include but are not limited to:
- Erie Canal in New York between Lockport and the Genesee River is home to one of the largest collection of table bridges
- Gulf Intracoastal Waterway between the Judge Perez Bridge in Louisiana and the Veterans Memorial Bridge in Texas (including Bayou Lafourche and Bayou Terrebonne in Louisiana) features several table bridges
- Trent-Severn Waterway in Ontario; both table bridges and bobtail swing bridges are located along its entire length
- Multiple road bridges in Milwaukee, Wisconsin
A table bridge in operation
)
See also
- Moveable bridges for a list of other movable bridge types
- Submersible bridge for a similar bridge that disappears by moving down