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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.
Including approaches, the Brooklyn Bridge is a total of 6,016 feet (1,834 m) long [2] [3] [4] when measured between the curbs at Park Row in Manhattan and Sands Street in Brooklyn. [4] A separate measurement of 5,989 feet (1,825 m) is sometimes given; this is the distance from the curb at Centre Street in Manhattan. [5] [6] [7]
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]
Steel bridges in the world, and other bridge statistics, The Swedish Institute of Steel Construction, March 2003 (out of date) Virola, Eur Ing Juhani, Two Millennia - Two Long-Span Suspension Bridges, Australian Academy of Technological Sciences and Engineering, ATSE Focus No 124, November/December 2002 (revised information up to date as of 2005)
A long-closed plot of land under the Brooklyn Bridge has reopened to the public after 15 years — restoring another slice of greenspace for one of the city’s most crowded neighborhoods.
The bridge required 20,000 tons of steel (13,000 tons in structural steel and 7,000 in reinforcing steel) and 94,000 cubic yards of concrete. To add the concrete girders, 900,000 cubic yards of fill were dredged, and the caissons for the towers were drilled and blasted 100 feet into the bed of the bay.
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