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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 current steel bridge was designed by Robert Giles and constructed in 1900. The piers rest on pile foundations in the riverbed. [1] [4] The bridge consists of three fixed sections as well as a 290-foot-long (88 m) swing section, which can swivel nearly 65 degrees and leave a 100 feet (30 m) of clearance on each side. [1]
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.
The Swing Bridge stands on the site of the Old Tyne Bridges of 1270 and 1781, and probably of the original Roman Pons Aelius bridge. [ 2 ] The previous bridge on the site was demolished in 1868 to enable larger ships to move upstream to William Armstrong's works. [ 3 ]
It could swivel from side to side and was equipped with a beak-like iron hook at the far end of the bridge, from which the name is figuratively derived, intended to anchor the enemy ship. The corvus was still used during the last years of the Republic.
In the 1980s the swivel became inoperable. [12] The bridge was nominated for listing on the National Register of Historic Places about 2006. [13] In March 2007, planned maintenance and re-painting began on the bridge, closing the bridge to traffic at times. [14] The $2.5 million project was completed in October 2007. [15]
Hàn River bridge (Vietnamese: Cầu Sông Hàn) is a cable-stayed swing bridge in Da Nang, Vietnam. Da Nang lies on the west side of the Hàn River and the beaches are to the east. [1] In the middle of the night, traffic is stopped from crossing the Song Han Bridge and it swings on its axis to allow shipping traffic to pass along the river.
I think it would also be helpful to the reader to summarize these points of interest in some way, perhaps in the lead itself or in section 1 (first section after the lead), noting that three of the 13 historical points of interest are no longer extant (or have been destroyed); I'm referring to the Swivel bridge, the General store, and the barn ...