Experimental method for measuring distribution of breaking longitudinal force of steel rail of railway
An experimental method and longitudinal force technology, applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve the problems of increasing the cost of experiments, difficulty in controlling the magnitude of temperature force, unfavorable distribution of longitudinal force of rail fracture, etc., to achieve The effect of shortening the experiment time and reducing the experiment cost
Active Publication Date: 2012-10-10
DALIAN UNIV OF TECH
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This method is to lock the rail when the temperature is the highest, and cut the rail when the temperature is the lowest, so as to ensure that there is a large longitudinal temperature force inside the rail before sawing. This experimental method is not only limited by time, but also by natural temperature di
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[0016] The specific implementation manners of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0017] The present invention utilizes a rail stretching machine to prestress the rail, and can accurately control the size of the prestress by means of a force measuring sensor group installed on the rail, and according to Hooke's law and the relationship between solid thermal expansion strain and temperature, it can be converted to obtain the corresponding Rail temperature change amplitude; after the prestress is released, the longitudinal force distribution value of the rail fracture under a certain rail temperature change amplitude or tensile stress can be measured through the load cell group.
[0018] This example takes the longitudinal force distribution experiment of rail fracture as an example when the rail temperature variation amplitude is -21.3°C. The specific experimental method steps are as fol...
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The invention discloses an experimental method for measuring distribution of breaking longitudinal force of a steel rail of a railway, relates to the technical field of security detection for railways, and particularly relates to an experimental method for measuring a distribution law of breaking longitudinal force of a steel rail of a railway. The experimental method is characterized in that change of the state of the rail steel is simulated when the rail steel is broken by means of applying prestress on the steel rail and then releasing the prestress, and the distribution of the longitudinal force of the steel rail before and after the prestress is released is measured by a force sensor group to obtain the distribution law of the breaking longitudinal force of the steel rail. The experimental method includes mounting the force sensor group on the long steel rail of a track with a certain length at first; completely releasing fasteners of the long steel rail; applying the certain prestress on the long steel rail by a steel rail stretching machine; locking the fasteners of the long steel rail; finally releasing the prestress; acquiring stress data of the steel rail by a sensing node group and the force sensor group; and transmitting the data to a computer by a wireless gateway to obtain the distribution law of the longitudinal force after the steel rail is broken. By the aid of the method, accurate, controllable and low-cost experiment for distribution of the breaking longitudinal force of the steel rail can be realized.
Description
technical field [0001] The invention relates to the technical field of railway safety detection, in particular to an experimental method for measuring the distribution law of the fractured longitudinal force of railway rails. Background technique [0002] Railway is the main mode of land transportation in my country. It has the advantages of stable operation, large transportation volume, low energy consumption and light environmental pollution. Rail is an important part of railway structure, and its reliability is the key to ensure the safety of railway operation. Especially the fast-growing high-speed railways are all seamless lines. The rails of this line cannot be stretched freely. As the rail temperature changes, a huge longitudinal temperature force will be generated inside the rail. This huge temperature force may cause rail welding. Weak points such as seams and transition sections break, threatening driving safety. [0003] The stress method is an important means t...
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Inventor 王大志刘冲梁军生戴恒震王立鼎宋晓伟任同群王珂薛松
Owner DALIAN UNIV OF TECH
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