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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 ...
The floor of the bridge consists of a number of 19-foot-wide (5.8 m) transoms that run across the bridge, with 10-foot-long (3.0 m) stringers running between them, and over the top of the transoms, forming a square. [3] Transoms rest on the lower chord of the panels, and clamps hold them together.
From west to east, the three spans include: A Warren deck truss (101 ft long), a Pennsylvania through truss (327 ft long and one of the longest in the state [3]), and a swing span (461 ft long). [6] Together they bring the total length of the swing bridge to 889 ft. [10] [9] The stone-block piers and abutments are built on timber pilings. [3]
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.
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic.
The world's longest suspension bridges are listed according to the length of their main span (i.e., the length of suspended roadway between the bridge's towers). The length of the main span is the most common method of comparing the sizes of suspension bridges, often correlating with the height of the towers and the engineering complexity involved in designing and constructing the bridge. [4]
Beam bridge spans rarely exceed 250 feet (76 m) long, as the flexural stresses increase proportionally to the square of the length (and deflection increases proportionally to the 4th power of the length). [28] However, the main span of the Rio–Niteroi Bridge, a box girder bridge, is 300 metres (980 ft). [29]
A segmental bridge is a bridge built in ... very economical for long spans (more than 100 metres or 330 feet), especially when access to the construction site is ...