双线桥上CRTS Ⅱ型板式无砟轨道结构涂刷反射隔热涂层影响分析

来源期刊:中南大学学报(自然科学版)2019年第4期

论文作者:杨荣山 刘学毅 杨吉龙 姜恒昌 康维新 李振庭

文章页码:1005 - 1013

关键词:CRTS II型板式无砟轨道;反射隔热涂层;梁轨相互作用;持续高温

Key words:CRTS II type plate ballastless track; reflective and insulated coating; beam-rail interaction; continuous high temperature

摘    要:为降低持续高温对轨道结构的影响,分析反射隔热涂层在桥上CRTS Ⅱ型板式无砟轨道结构上的适用性。对比分析反射隔热涂层涂刷前后及不同涂刷次序下桥梁-轨道系统的纵向受力特性。研究结果表明:全桥涂刷反射隔热涂层对梁体的影响可以忽略;在最不利条件下施工时,涂刷反射隔热涂层处底座板的伸缩压力增大200~ 400 kN,但远小于轨道板伸缩压力的降低幅度;涂刷反射隔热涂层后,轨道板伸缩压力降低约1 800 kN,有效降低了持续高温情况下轨道板上拱风险。在铁路双线桥CRTS Ⅱ型板式无砟轨道结构上涂刷反射隔热涂层时,优先考虑轨道板受力即可;双线同时涂刷对轨道结构受力最有利。

Abstract: In order to reduce the impact of sustained high temperature on the track structure, the applicability of reflective and insulated coating on CRTS II slab ballastless track structure on bridge was analyzed. The different longitudinal mechanical characteristics of the bridge-track system were studied by considering the influence of the reflective and insulated coating and its brushing order as well. The results show that the effect of reflective and insulated coating on the beam-rail interaction can be neglected when the whole bridge is brushed. The base plate retractable pressure in the brushing area will increase by 200-400 kN under the most unfavorable conditions, which is much smaller than the reduction magnitude of the retractable pressure of track plate. The expansion pressure of the track slab decreases by about 1 800 kN after brushing the reflective heat insulation coating, which effectively reduces the risk of arch on the track slab under the condition of continuous high temperature. The stress of the track slab should be given the priority when the reflective heat insulation coating is applied on the CRTS Ⅱ type ballastless track structure of the two-lane railway bridge, and the force situation will be more favorable for the track plate when the both railway lines are brushed at the same time.

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