Novel bolted fastener for urban rail transit

Abstract

A novel bolted fastener for urban rail transit is used for effectively reducing the overturning of a steel rail and the dynamic stress of an elastic strip, improving the stability of the steel rail and greatly prolonging the fatigue service life of the elastic strip. The novel bolted fastener comprises an iron backing plate, an elastic strip, an under-rail elastic backing plate, a T-shaped bolt, alocknut, a special-shaped flying-preventing flat washer and insulating damping track gauge blocks, the iron base plate is fixedly installed on the under-rail foundation through anchor bolts, an under-plate elastic base plate is arranged below the bottom face of the iron base plate, and the steel rail is located on the iron base plate. The insulating damping track gauge blocks are located on the top face and the outer side of the steel rail bottom. The lower end of the T-shaped bolt is installed on the iron base plate, the upper portion of the T-shaped bolt is sleeved with the special-shaped anti-flying flat washer and the locknut to press the elastic strip, the front end of the elastic strip acts on the top face of the insulation damping gauge block, and the rear end of the elastic stripacts on an iron base plate boss.

Description

technical field [0001] The invention relates to rail traffic, in particular to a novel fastener with bolts for urban rail traffic. Background technique [0002] Rail fasteners are the main part of the track structure and an important part that connects the rail and the foundation under the rail. The main functions of fasteners include: (1) maintaining and adjusting the gauge and direction of the rail; (2) providing longitudinal resistance to prevent the rail from crawling and breaking the rail from being too large; (3) providing elasticity to reduce vibration and impact; (4) Increase the rigidity of the track frame to prevent the track from buckling; (5) Provide track insulation to ensure the normal operation of the track circuit; (6) Have a certain ability to adjust the height of the rail. [0003] According to the classification of the clip fixing method, the commonly used fasteners in domestic rail transit can be divided into bolt fasteners and boltless fasteners. Faste...

AI Technical Summary

Problems solved by technology

[0006] 1. Fasteners with bolts usually use a smaller stiffness of the under-rail backing plate to provide fastener elasticity. Under this design, the under-rail backing plate will produce relatively large deformation under the action of the train load, which will cause large rail and elastic deformation. The amplitude of the strip is unfavorable to the maintenance of the dynamic stability of the rail and the force of the spring strip;

[0007] 2. T-shaped bolts and nuts are used to fasten the elastic strips with bolt fasteners. Under the action of the train load, the nuts are forced to vibrate together with the elastic strips. The nuts in the traditional design do not consider the anti-loosening design. After a period of service, the T-shaped bolts and nuts are easy to be damaged. Vibration loosening may cause the buckle loss or even failure of the spring bar, which will affect the stability of the rail. Therefore, the public works maintenance department needs to regularly check the tightening force of the T-shaped bolts and nuts, and the maintenance and repair workload is relatively large;

[0008] 3. The anti-flying function of the clip is not considered. Under abnormal working conditions (such as excessive vibration acceleration), the fastener clip may break and fly out and hit the train, trackside equipment and pedestrians.

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