上部锁紧式双层非线性扣件在南昌地铁的应用

Application of Up-self-locked Double Nonlinear Fastening on Nanchang Metro

上部锁紧式双层非线性扣件是一种新型减振扣件,具有拆卸方便、预紧力可调节等优点。针对该扣件对南昌地铁1号线进行了现场在线测试,测试内容包括钢轨变形、道床振动、隧道壁振动、车内振动和噪声等。测试结果表明,在保证安全性的同时,上部锁紧式双层非线性扣件相比DZIII型扣件,其垂向减振效果达到8 d B以上,使列车内噪声降低2.4 d B,减振降噪效果显著。

Up-self-locked double nonlinear fastener is a new fastening system which is easy to be disassembled and the preload can be modified. An on-line test was carried out on Nanchang Metro Line 1 to prove the security and the damping performance of up-self-locked double nonlinear fastening system, which includes the deformation of the rail, the vibration of the ballast and the tunnel wall, as well as the vibration and noise in the vehicle. The result showed that the up-self-locked double nonlinear fas- tening system had a significant effect on reducing the vibration and noise compared with DZIII fastening system. This new fas- tening system can decrease the vertical vibration by more than 8dB and lower the noise in the vehicle by 2.4dB.