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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 hydraulic Swing Bridge was designed and paid for by Armstrong, with work beginning in 1873. It was first used for road traffic on 15 June 1876 and opened for river traffic on 17 July 1876. [4] At the time of construction it was the largest swing bridge ever built. The construction cost was £240,000. [5]
The Atherley Narrows Swing Bridge is a Canadian National rail bridge located at the confluence of Lake Simcoe and Lake Couchiching at the Atherley Narrows, near Orillia, Ontario. [ 1 ] The current bridge was constructed in 1970 as a plate girder bridge, consisting of nine steel through plate girder sections supported on eight steel pile bents.
Submersible bridge – also called a ducking bridge, the bridge deck is lowered into the water; Tilt bridge – the bridge deck, which is curved and pivoted at each end, is lifted at an angle; Swing bridge – the bridge deck rotates around a fixed point, usually at the centre, but may resemble a gate in its operation ; road or rail
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.
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The bridge was built as part of the construction of the Hull and Barnsley Railway (opened 1885); it consisted of three spans; two 81 ft (25 m) bowstring lattice girder approach spans, and a central swinging span of 248 ft (76 m) also of lattice girder design, with a central operating cabin at the swing bridge centre located above the track. The ...
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