Precautions for the use of railway equipment fishplate

With the continuous development of heavy-duty and high-speed railways, the performance of rails as the main load-carrying parts of railways has received more and more attention. The strength of rails has reached 1000MPa level, and further improved.
Fishtail splint (track joint splint), commonly known as splint, also called fishplate, plays a connecting role at the track joint. Divided into light rail, heavy rail and lifting rail. The fishplate is a connecting fastener used for the connection between the track and the track. In fact, the rails are connected by fishplates and other connecting parts, so as to keep the range of joints to bear the same bending moment and lateral force as the rails. The working state and safety performance of the fishplates also directly affect the running state and safety of the line. The phenomenon of major accidents caused by the failure of the fishplate on the site occurs from time to time. The formation of fishplate cracks is closely related to the interaction between the fishplate and the rail surface. The fishplate and rail joints connected by bolts are not a rigid whole under actual working conditions. The impact of the wheel, the existence of rail gaps, and especially the decrease in tightening force caused by the wear between the rail and the fishplate will It causes or aggravates the mutual rolling between the fishplate and the rail, resulting in surface deformation. The accumulation of this deformation provides a great opportunity for the initiation of cracks on the surface of the fishplate.
In addition, it is worth mentioning that some fishplates for special purposes or for special parts, such as special-shaped fishplates, fishplates at the toe or fishplates used in tunnels, due to the more complicated stress state, It is more difficult to maintain, and it is often affected by some corrosive air, so the failure rate is often higher than that of ordinary fishplates, and the damage to the line is also greater, so it should be paid enough attention.