- Source: Vertical-lift bridge
A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck.
The vertical lift offers several benefits over other movable bridges such as the bascule and swing-span bridges. Generally speaking, they cost less to build for longer moveable spans. The counterweights in a vertical lift are only required to be equal to the weight of the deck, whereas bascule bridge counterweights must weigh several times as much as the span being lifted. As a result, heavier materials can be used in the deck, and so this type of bridge is especially suited for heavy railroad use. The biggest disadvantage to the vertical-lift bridge (in comparison with many other designs) is the height restriction for vessels passing under it, due to the deck remaining suspended above the passageway.
Most vertical-lift bridges use towers, each equipped with counterweights. An example of this kind was built in Portland, Oregon, United States in 1912.
Another design uses balance beams to lift the deck, with pivoting bascules located on the top of the lift towers.
Examples
See List of vertical-lift bridges.
Gallery of images
See also
Moveable bridges for a list of other movable bridge types
Submersible bridge for a similar disappearing bridge
Table bridge for a vertical-lift bridge without visible lifting means
References
= Bibliography
=External links
Media related to Vertical-lift bridges at Wikimedia Commons
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- Vertical-lift bridge
- List of vertical-lift bridges
- Aerial Lift Bridge
- Arthur Kill Vertical Lift Bridge
- Steel Bridge
- Hawthorne Bridge
- John Alexander Low Waddell
- Portage Lake Lift Bridge
- BNSF Railway Bridge 5.1
- Second Narrows Rail Bridge
