轨枕间距对钢轨波磨的影响

Effect of Sleeper Spacing on Rail Corrugation

主要研究轨枕间距对钢轨波磨发展的影响。研究小半径曲线内轨的小矢跨比波磨。这些出现问题的曲线段属于西班牙毕尔巴鄂区域的地铁轨道,铺设着混凝土道床和两层STEDEF型支承垫层。当初始轨枕间距为1000mm时,仅有92万组轮对通过后所测得的波磨深度峰-峰值已经达到0.42mm。随后更换产生波磨的钢轨,比较列车通过时轨枕上方和轨间中部的内轨垂向、横向加速度。当轨枕间距为1000mm时,轨间中部出现频率为204和244Hz的强烈响应,在轨枕上方却未出现。在相邻轨枕中间铺设一个轨枕,使轨枕间距变为500mm,钢轨波磨停止发展。该结论是根据2年的观测结果得到的。

The present paper looks at the effect of sleeper separation on rail corrugation growth. The case under study involves short pitch corrugations on the low rail in sharp bends, the bends in question being those of metro-type railways in Bilbao, with the track on concrete slabs and with two resilient stages of STEDEF type, With an initial sleeper separation of 1 000 mm, corrugation depths measured up to 0.42 mm peak- to-peak after the passing of only 920 000 wheelsets. Following the replacement of corrugated rails with new ones, vertical and transversal accelerations on the low rail were compared above sleepers, and at mid-span, while trains passed by. With a separation distance of 1 000 mm there is, at the mid-span, a sizable response at 204 and 244 Hz that is not present above the sleepers. With the insertion of intermediate sleepers, hence reduction of separation to 500 mm, corrugation growth was found to cease. The results described in this paper derive from two years＇ observation.