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A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
"This 400-foot viaduct consists of twenty 20-foot reinforced-concrete slab spans. Two parallel rows of 16-foot square columns, 17'-6" apart, support the deck. Roadway width is about 18 feet. The structure was designed to ride along the hillside above the railroad mainline because of tight right-of-way clearances.
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]
The highest pylons in the world: pylons P2 and P3, 244.96 metres (803 ft 8 in) and 221.05 metres (725 ft 3 in) in height respectively, broke the French record previously held by the Tulle and Verrières viaducts (141 metres or 463 feet), and the world record previously held by the Kochertal Viaduct (Germany), which is 181 metres (594 ft) at its ...
A cantilever in a traditionally timber framed building is called a jetty or forebay. In the southern United States, a historic barn type is the cantilever barn of log construction. Temporary cantilevers are often used in construction. The partially constructed structure creates a cantilever, but the completed structure does not act as a cantilever.
[2] [18] The cantilever span was to measure 1,448 feet (441 m) long, 30 feet (9.1 m) wide, and 136 feet (41 m) high; the project, including 7 miles (11 km) of approach tracks, was to cost $5.5 million. [i] [19] The cantilever design was selected because it was cheaper than a suspension bridge of the same length. [20]