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A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
The bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
Pages in category "Swing bridges in the United States" The following 89 pages are in this category, out of 89 total. This list may not reflect recent changes .
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. [1]
The bridge rotates slowly laterally, allowing pedestrians to remain on the bridge while it is rotating. [1] The design includes a barrier on the western side to prevent entry, while, on the eastern side, pedestrians can step on and off the bridge while it is in motion. The speed of the bridge opening and closing is 0.15 m (0.16 yd) per second. [3]
Since the restoration about 2,500 tourists have visited the bridge each year. [7] The Sale Swing Bridge was used as a set in 2007 for the filming of the 2008 film The Tender Hook, starring Hugo Weaving and Rose Byrne. [8] In April 2017 vandals lodged a block of wood in the gear mechanism, causing an axle to bend and the bottom roller beam to crack.
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 bridge (2003) The bridge consisted of four fixed spans, one swing span and a fifth swing span, and carried a double-track railway. [5] [note 1]Pier foundations for the bridge spans were of 7 ft (2.1 m) base diameter cast iron cylinders, which tapered to 5.5 ft (1.7 m) diameter at the high water level, each column was around 90 ft (27 m) long. [6]