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Cable and strand is available in galvanized carbon steel, type 304 stainless steel, or the highly corrosion resistant, type 316 stainless steel (best for coastal areas). The most common cable construction is 1x19 type construction strand, which is 19 cables twisted in a single bundle, whereas for example, 7x7 would be 7 cable bundles of 7 ...
All modern rails are hot rolled steel with a cross section approximate to an I-beam, but asymmetric about a horizontal axis (however see grooved rail below). The head is profiled to resist wear and to give a good ride, and the foot profiled to suit the fixing system.
Right: bullhead rail, an older design used mainly in the UK, which sits in a cast-iron chair with a timber or spring-steel key to keep it secure. Main article: Rail profile Modern track typically uses hot-rolled steel with a profile of an asymmetrical rounded I-beam . [ 16 ]
Both types utilise a 'combined rail' of steel rails each attached through a conventional modern railway fastener to a longitudinal pre-stressed concrete supports (6.25m long) which are kept in gauge by thick walled tubular steel cross members embedded in the concrete. [15] Forms for axle load of 40 tonnes have been designed. [1]
Strap rails introduced in the late 18th century, of cast and later rolled iron were nailed to wooden supports via countersunk holes in the metal. The introduction of rolled rail profiles in the 1820s such as the single flanged T parallel rail and later double flanged T parallel rail required the use of chairs, keys to hold the rail, and bolts ...
A street in SoHo in New York City famous for its cast-iron facades. Spa Colonnade in Mariánské Lázně, 1889.Nearly every element is cast iron. Cast-iron architecture is the use of cast iron in buildings and objects, ranging from bridges and markets to warehouses, balconies and fences.
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