Due to the high speed of the train, in addition to requiring the elastic parts of the special head screw of the subway to have sufficient buckle pressure, considerable elastic range and a strong ability to maintain the gauge, high-speed railway must also have the following characteristics. Less maintenance of fasteners. Once the high-speed railway is opened, due to the high speed and high density of traffic, track maintenance can only be carried out within a short blockade point. This requires the fastener components to have sufficient strength and durability. The fastener has good noise and vibration reduction performance. With the increase of train speed, the dynamic effect of the track increases sharply, so the special head screw of the subway is required to have good noise reduction and vibration reduction performance, that is, the fastener is required to use a buffer plate with better elasticity. In order to ensure the absolute safety of high-speed railway running, it is required that the fasteners have good insulation performance, and there should be enough impedance between the two strands of rail to ensure the normal operation of the track circuit. After high-speed railway, due to the requirements of the use of large track maintenance machinery gasless plate operation, and bolt-free spring strip type III fastener parts are less, convenient loading and unloading, in the long run, can greatly reduce maintenance costs. In order to meet the requirement of ballasted track of high-speed railway, plastic casing type must be used instead of sulfur anchorage for special head screw of bulleted subway. In addition, the structure of the second type fastener, the bolt is bent, the plastic sleeve water and dirt are not easy to solve; Other protective measures should be taken to prevent bolt corrosion. The type III fastener does not have these problems. It is recommended to use 60210217 rubber plate under the rail, whose static stiffness ranges from 55 to 80kNΠmm. Satisfactory results can be obtained.

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