Online high-quality permanent welding-repairing construction method for high-speed railway line

Abstract

The invention relates to the technical field of high-speed railway steel rail welding, and discloses an online high-quality permanent welding-repairing construction method for a high-speed railway line. The online high-quality permanent compound-welding construction method comprises the following steps of adopting a full-automatic numerical control gas pressure rail welding machine configured in a movable type gas pressure rail welding vehicle, adopting an inverted order method as an operating method for welding-repairing construction, namely firstly carrying out offline non-stress welding and postwelding pressure maintaining normalizing heat treatment at the position of a 1# head by the rail welding vehicle, then making the rail welding vehicle return to a parking place, then adopting a metal sleeper to jack up a 20-meter steel rail at the retained section of a 2# head, making the rail welding vehicle climb to a station of the 2# head, and then carrying out online stress welding and postwelding pressure maintaining normalizing heat treatment at the position of the 2# head. By the adoption of the online welding-repairing standardized construction technology of the gas pressure rail welding vehicle, the operating process is safe, the process stability is good, welding head quality is excellent, once welding locking operation is efficient and the construction scheme is simple and economic.

Description

technical field [0001] The invention relates to the technical field of high-speed railway rail welding, in particular to an on-line high-quality permanent welding reconstruction method for high-speed railway lines. Background technique [0002] The opening and operation of high-speed railway marks the rapid development of my country's railway construction. During the operation of high-speed railways, the problem of local damage to rails will inevitably occur, and the best technical methods need to be adopted for permanent maintenance. If the line maintenance operation method is not proper, it will not only lead to the change of the locked rail temperature of the line, affect the stability of the seamless line, but also involve the economy and safety of line maintenance. [0003] In the process of maintenance of seamless lines of high-speed railways, the damaged rail sections (including base metal and welded joints) need to be removed and new rails inserted. The passed line...

AI Technical Summary

Problems solved by technology

In the past, due to the poor adaptability of flash welding rail cars to stress welding conditions, the flash process was difficult to control stably, and the key technology and equipment for online stress welding construction were still blank, so the aluminothermic welding method had to be used to repair damaged rails. welding repair

However, the weld microstructure of aluminothermic welding is cast microstructure, which has poor comprehensive properties, especially the extremely poor plasticity and toughness of the joints.

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