Stress release and locking method of seamless line

Abstract

The invention discloses a method for relieving and locking stress on seamless tracks, and relates to the technical field of methods for maintaining seamless tracks. The method includes steps of firstly, setting observation points in unit rail link intervals; secondly, detaching fixing fasteners of unit rail links; thirdly, bedding rollers; fourthly, colliding rails and observing displacement at the observation points; fifthly, dropping the rails and locking the tracks. The method has the advantages that by the aid of the method for relieving the stress by a roller process and a stretcher and roller process jointly, expansion and contraction of the unit rail links are facilitated as sliding friction among the rails and sleepers is changed into rolling friction by the rollers, and the stress can be relieved uniformly; rail collision points are arranged on the unit rail links at intervals ranging from 300 meters to 500 meters, so that the internal stress of the steel rails can be relieved by means of rail collision; the stretcher and roller process includes that the rail temperature is lower than a designed locking rail temperature when the steel rails are in zero-stress states, and the purpose that the steel rails are in designed locking rail temperature states can be achieved by means of stretching the steel rails.

Description

technical field [0001] The invention relates to the technical field of seamless line maintenance methods. Background technique [0002] With the large-scale speed increase of my country's railways, especially the construction of passenger dedicated lines, more and more seamless lines are laid at one time. my country's "Main Railway Technical Policies" proposes that high-speed and heavy-duty lines should give priority to the development of ultra-long seamless lines across intervals. road. However, due to the limitation of construction season and construction conditions, when laying seamless lines, it is often impossible to lock at the design locking rail temperature, which brings many difficulties to maintenance work. If the temperature of the locked rail is low, not only the maintenance work is subject to many restrictions, but also the rail is subject to great temperature pressure at high temperature, and the uneven crawling of the long rail causes "stress concentration", a...

AI Technical Summary

Problems solved by technology

[0005] (2) The locked rail temperature is unclear or inaccurate;

[0007] (4) Improper laying or maintenance operation methods cause abnormal expansion and contraction of the rails;

[0008] (5) Serious uneven displacement occurs in the fixed area or seamless turnout;

[0009] (6) The direction of the track in summer is seriously bad, with many broken bends;

[0010] (7) Through the test, it is found that the distribution of temperature and force is seriously uneven;

This method requires a lot of labor, and in addition, it needs to be equipped with a rail impactor. The emission is concentrated near the rail impactor, while the emission in other places is uneven, and it is easy to generate new uneven temperature forces inside the rail.