Railway bolt is a kind of bolt widely used in railway construction to prevent rail movement. The rail connection plate is welded to the upper surface of the bottom flange of the rail. In general, the rail binding board overhangs the side of the track by 100 to 150mm.
The rail anchor block is then welded to the rail support surface to prevent longitudinal movement of the rail. The blocks are positioned away from the edge of the track, which has no effect on the lateral adjustment of the track. Welding of the rail requires a low hydrogen (or austenitic) electrode and an appropriate degree of preheating. This will depend on the carbon content or carbon equivalent of the rail steel. It is necessary to weld the anchor points of the rail without damaging the tie plate under the rail. When installing the e track fasteners, the track temperature should always be kept below 150 ° C. An alternative to a central fixing point is to use a wooden block at the end of the track. These are usually welded to the rail support, about 50 to 100 mm from the end of the rail. This is often a better solution to ensure that the track does not move than using a fixed point.
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