A Design Method for the Plane Type of Lateral Point Rail of Turnout

Abstract

The invention relates to a turnout curved switch rail plane linetype which is composed of a straight line portion and a curve portion. The curved switch rail plane linetype is a combination of a straight line and a curve. The linetype of the working edge of a switch rail portion is a straight line section from the actual tip of a switch rail to the actual starting point of a curve section, and the distance bq from the actual starting point of the curve section to the working edge of a stock rail is larger than the maximum impact section width delta of a wheel at the time of reverse turnout entry; the linetype of the working edge from the actual starting point of the curve section to the heel of the switch rail is also a curve section; the angle of shock formed by the working edge of the straight line section and the working edge of the curve section meets the formula that (Vc * sin beta c) <2> is less than 0.8 (km / h) <2>, wherein Vc refers to the allowed lateral passing velocity of a train, and beta c refers to the angle of shock. According to the turnout curved switch rail plane linetype, on the premise that the dynamic indexes meet requirements when the train laterally passes through a turnout, the railhead width of a weak section of the curved switch rail can be increased remarkably, the wear resistance of the curved switch rail is improved, and therefore the service life of the curved switch rail is prolonged. The turnout curved switch rail plane linetype can be widely applied to heavy haul railway turnouts, urban rail transit turnouts, speed-raising turnouts and other turnout structures with a high requirement for the service life of switch rails.

Description

technical field [0001] The invention relates to a method for designing the plane alignment of a lateral switch rail, and belongs to the technical field of railway switch design. Background technique [0002] Turnout lateral switch rail refers to the switch rail that the train passes when running sideways. The lateral point rail (hereinafter referred to as the point rail) is one of the most important parts of the turnout. When the train enters the turnout in the reverse direction, it plays the role of guiding the moving train to turn and pass the turnout sideways; To restrict the movement of the train along the tip rail line. Since the superelevation of the turnout is not preset, the train will generate centrifugal force when running in the curved section, and the train will generate lateral force on the switch rail during the process of entering and exiting the switch, resulting in side wear of the switch rail. However, the difference between the two is that there is a pro...

AI Technical Summary

Problems solved by technology

The disadvantage is that the impact angle is maintained in a large range, so that the guide curve is moved backward, which shortens the length of the guide curve, which is not conducive to the improvement of the radius of the guide curve, so that the speed of the turnout is greatly restricted, which is not conducive to improving the operation under the same station conditions. efficiency and reduce passenger comfort

[0006] The definition of curved point rail is bq0 is smaller than the maximum impact angle βc, the benefit is that under the same impact angle, the distance from the maximum impact section to the actual tip can be shortened, thereby further shortening the length of the turnout, or obtaining better performance at the same length of the turnout, such as guide The radius of the curve increases or the impact angle decreases, etc.; however, when the turnout turns out laterally, the wheel moves along the guide curve in the same direction as the centrifugal force tangent, and the point rail is always in a state of wear, and the lateral force is consistent regardless of the large section or small section, resulting in sharp The rail wears evenly, which is not conducive to the improvement of the wear resistance of small sections

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