A swing bridge is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its centre of gravity, about which the turning span can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot.
In its closed position, a swing bridge carrying a road or railway over a river or canal, for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped (usually by traffic signals and barriers), and then motors rotate the bridge approximately 90 degrees horizontally about its pivot point.
Read more about Swing Bridge: Advantages, Disadvantages
Famous quotes containing the words swing and/or bridge:
“And then came the most devastating thought of all: I was one of them. I who used to swing upside down on a living horse, who always danced when mere walking would have done, so glad was I of life, so full of health. It was the most gruesome thought I had ever had in my life.”
—Josephine Demott Robinson (1865–1948)
“In bridge clubs and in councils of state, the passions are the same.”
—Mason Cooley (b. 1927)