| Table bridge | |
|---|---|
 |
|
| Open | |
| 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. Hydraulic pillars under the bridge 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.
A table bridge in operation
Left: Looking across the bridge that crosses the river Scheldt (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
- Movable bridge for a list of other movable bridge types
- Submersible bridge for a similar bridge that disappears by moving down
