Bascule_bridge
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A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed. The name comes from the French term for balance scale, which employs the same principle. Bascule bridges are the most common type of movabl
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 The Wells Street Bridge (Chicago), a double-leaf fixed-trunnion bascule bridge | |
| Carries | Pedestrian, bicycle, automobile, truck, light rail, heavy rail |
|---|---|
| Span range | Short |
| Material | Steel |
| Movable | Yes |
| Design effort | Medium |
| Falsework required | Site and prefabrication specific |
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