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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 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.
A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2] In American English, the term is synonymous with drawbridge , and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers to only a ...
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 swing bridge raises some 300 millimetres (12 in) on 4 main jacks, mounted on to substantial sub-frame in the turning pit. The swing bridge raises to clear the fixed span and land abutment's scarfed rail joints and to also clear the fixed overhead conductor rails, which are gantry mounted to the swing bridge and the approach spans.
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The footpath on the north side of the bridge. It was 212 feet (65 m) long in total, with a clear span of 120 feet (37 m), and a roadway width of 24 feet (7.3 m). [1] The bridge was constructed from wrought iron, and weighed 620 tonnes (610 long tons; 680 short tons), including 60 tonnes (59 long tons; 66 short tons) of timber decking and 240 tonnes (240 long tons; 260 short tons) of kentledge ...