The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or one-eighth turn, in order to clear the channel.OverviewA swing bridge (or swing span bridge) is a 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 c. • As this type requires no counterweights, the complete weight is significantly reduced as compared to other moveable bridges.• Where the channel is wide enough for separate traffic directions on each side, the likelihood o. • In a symmetrical bridge, the central pier forms a hazard to navigation. Asymmetrical bridges may place the pivot near one side of the channel.• Where a wide channel is not available, a large portion of the bridge may be ove.
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