Experimental method for measuring distribution of breaking longitudinal force of steel rail of railway

Abstract

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 longitudinal force of a railway rail fracture. Background technique [0002] Railway is the main method 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 ensuring the safety of railway operation. Especially the fast-developing high-speed railways are all seamless lines. The rails of this line cannot expand and contract freely. As the rail temperature changes, a huge longitudinal temperature force will be generated inside the rail, which may cause rail welding. Weak points such as seams and transition sections are broken, threatening driving safety. [0003] The stress method is an important means to detect r...

AI Technical Summary

Problems solved by technology

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 differences. Limitations, the temperature force inside the rail is difficult to control, and repeated experiments require repeated sawing and welding of the rail, which also increases the cost of the experiment and is not conducive to the study of the distribution of the longitudinal force of the rail fracture

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