Railroad maintenance plays a key role in ensuring safety and stability of railway running operaion. What machines are used in the maintenance work? Why they are needed?
QU70, QU80, QU100, QU120, etc. are sizes of crane rail. QU70 is a specific size of QU crane rail series according to Chinese standard. The number “70” refers to the head width of the crane rail. Thus the QU70 rail head is 70mm wide.
Crane rail is needed for the crane to work with as a complete system of operating the lifting work. The choose of crane rails and the installation of crane rails must meet the requirements. Then the cranes can play its role efficiently.
Rail grinding is one effective technique of railroad track repair and maintenance. This article is about the practice of rail grinding.
The mechanical wear on the railway line is gradually increasing, and the geometric dimensions of the track, ballast, subgrade and are gradually deformed. Especially the large damage to the track structure and its parts, causing serious railroad track deformation. Therefore, it is particularly important to repair and maintain railroad track.
Made of steel, railway track (railroad track in AE) will expand when the temperature rises and contract when it’s cold. When the railway track is exposed to extreme heat, it may buckle. When the ground temperature reaches 37℃, the rail surface temperature can reach about 50℃.
Railway steel or some called rail steel is used for making railroad tracks. Railroad tracks are bearing heavy loads and subject to wear and fatigue. So the grade of railway steel must meet the demands of train speed and load. Proper chemical composition of railway steel enables the rails to have enough hardness and wear resistance, also anti-fatigue property. Generally, the content of carbon is no more than 0.82%, and manganese is no more than 1.7%.
The railway track is a British express of the tracks on a railway. It is also called railroad track in the United States. Usually, people talk about the railway track as a whole structure including rails, sleepers, fasteners, ballast (or slab track ) and subgrade. The structure can be divided into two parts, the superstructure and the subgrade.
Railroad tracks, also called railroad rails or railway tracks, are essential for railway systems for its function of leading trains move forward and carrying loads then transfer it to the lower structure. With the development of railways in the direction of high-speed and heavy-load, modern requirements for rail quality are getting higher and higher. As the speed of the rail vehicle increases, rail life becomes shorter and shorter.
As we all know, railroad tracks are produced with certain lengths, such as 12.5m, 25m, and the lengthen ones from 50m to 100m. No matter how long the railroad rail is, they need to be joined end to end to make a continuous railroad. This can be realized by rail joints (joint bars) or welding methods. At this moment, we focus on welding railroad tracks.
