A winter stress relief method for super-large turnouts

Abstract

The invention provides an ultra-large type turnout stress dispersing method in winter. The method comprises the steps that the turnout dispersing range is determined by utilizing the insulation positions on the two sides of a turnout; fasteners are dismounted, rail crashing machines are arranged on the two sides of the turnout, and frog sleeper locking is performed; a steel rail is crashed with the rail crashing machines, and elongation is calculated; a liquefied gas blow lamp is lit by multiple operators to start to heat the inner side and the outer side of the rail waist of the steel rail, and then steel rail crashing is performed; when the heating temperature reaches the designed locked rail temperature, rail crashing is stopped, and the fasteners at the two ends are quickly fastened with an electric wrench; the steps are repeated to perform dispersing construction of the next steel rail. The method has the advantages that manual heating is adopted to control the temperature, the difficulty that construction cannot be performed normally under a low-temperature environment is overcome, and the ideal dispersing construction effect is achieved; the dispersing construction time is short, the dispersing amount is even, the locked rail temperature is accurate, the construction mode is simple and easy to operate, and the dispersing effect is good.

Description

technical field [0001] The invention belongs to the technical field of railway construction, in particular to a method for relieving stress of super-large turnouts in winter. Background technique [0002] In railway construction, due to the limitation of construction season and construction conditions, when laying seamless lines, it is often impossible to lock them at the designed locking rail temperature, which will bring many difficulties to the later maintenance work. If the temperature of the locked rail is low, not only the maintenance work will be restricted, but also the rail will be subject to great temperature pressure at high temperature, and the uneven crawling of the long rail will easily cause "stress concentration", so there is a danger of expanding the rail runway; on the contrary If the locking temperature is too high, the rail is subjected to a large tensile force at low temperature. After the line crawls unevenly, the tensile stress in some areas increases....

AI Technical Summary

Problems solved by technology

This method requires a lot of labor, and it needs to be equipped with a rail crasher, so the amount of radiation is concentrated near the rail crasher, while the amount of radiation in other places is uneven, and it is easy to cause new uneven temperature forces inside the rail.

[0007] Especially for super-large turnouts, if it is necessary to open in winter according to the construction schedule, it is difficult to achieve the designed locked rail temperature during winter construction. At this time, it is easy to cause the danger of rail expansion after the temperature rises. Therefore, low temperature in winter The environment and the excessive length of the turnout become the difficulty in the construction