Swing bridge

（重定向自Swing span）

BNSF Railway bridge across the Columbia River in Portland, Oregon, showing the swing-span section turning.

Swing Bridge for pedestrians, in motion with yacht approaching, at Victoria & Alfred Waterfront, Cape Town.

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 center 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.

单词	Swing span
释义	Swing span 英语百科 Swing bridge （重定向自Swing span） 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 center 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.
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