Design of WJ-15 Shoulder Fasteners for Ballastless Track in Suburban Railways
Based on the characteristics of suburban railway engineering,WJ-15 type fasteners have been developed for ballastless track sections.The fastener adopts a shoulder retaining and elastic non-separable structure.The design value of the static stiffness of the elastic pad is(25±5)kN/mm,the left and right adjustment of the steel rail is-10～+10 mm,and the height adjustment of the steel rail is-4～+26 mm.The indoor test results show that the static stiffness,dynamic static stiffness ratio,and static stiffness change rate after fatigue of the elastic pad of the fastener all meet the design and specification requirements.After the fatigue test of fastener assembly,the change rate of rail gauge,the change rate of assembly static stiffness,as well as the longitudinal resistance of the steel rail,the pull-out resistance of the sleeve,and the insulation resistance all meet the specification requirements.The natural frequency of the spring bar in the standard assembly state is greater than 800 Hz,and the risk of resonance fracture is relatively low.After using this fastener to lay the test section,real vehicle tests were conducted,and the results showed that when the train passes at different speed levels of 40～210 km/h,the safety parameters of the train and the stability parameters of the track structure could meet the specification requirements,and the fastener structure is stable and reliable..
suburban railwaysballastless trackshoulder fastenerindoor testingreal vehicle testing in the experimental section
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