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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 carries Highway 6 (formerly Highway 68) across a narrow channel separating Manitoulin Island from the much smaller Goat Island, forming the only land access.It consists of two 21 m (70 ft) deck plate girder approaches on the north end (Goat Island) and a single 18 m (60 ft) deck plate girder approach on the south end (Manitoulin Island), with a 112 m (368 ft) through swing bridge span.
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 ...
Swing bridge between Manitoulin Island and the mainland, in Little Current, Ontario, was built in 1913 by the Algoma Eastern Railway. Originally usable only by trains, it was modified in the late 1940s to allow road vehicles also to use it. The rail service was abandoned in the 1980s, and the tracks were removed in the 1990s.
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.
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