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Interest in concrete railway sleepers increased after World War II following advances in the design, quality and production of pre-stressed concrete. Chaired bullhead concrete sleepers have been around since at least the 1940s; the Great Western using a two-holed chair, thus saving both scarce wartime timber and steel fixing bolts. [ 4 ]
Pre-war experiments with long welded rail lengths were built upon, and in the years from 1960 long rail lengths were installed, at first on hardwood sleepers but soon on concrete sleepers. For example, the first long welded rail (almost 1 mi or 1.6 km) on the UK's East Coast Main Line was laid in 1957, just south of Carlton-on-Trent , resting ...
Pre-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned prior to the concrete being cast. [ 1 ] : 25 The concrete bonds to the tendons as it cures , following which the end-anchoring of the tendons is released, and the tendon tension forces are transferred to the concrete as compression by static friction .
Pre-stressed concrete sleepers are often used where timber is scarce and where tonnage or speeds are high. Steel is used in some applications. The track ballast is customarily crushed stone, and the purpose of this is to support the sleepers and allow some adjustment of their position, while allowing free drainage.
Wooden ties are used on many traditional railways. In the background is a track with concrete ties. A railroad tie, crosstie (American English), railway tie (Canadian English) or railway sleeper (Australian and British English) is a rectangular support for the rails in railroad tracks.
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]
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The railway track structure shall comprise 60 kg/m (120 lb/yd) I-class rails laid on monoblock prestressed concrete sleepers to 16,660/km (26,810/mi) sleeper density. The bridges will be built to the Modified Broad gauge (MBG) standard of loading.
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