Purpose-It is quite universal for high-speed turnouts to be exposed to the wear of the stock rail of the switch rail during the service process.The wear will cause the change of railhead profile and the relative posit...Purpose-It is quite universal for high-speed turnouts to be exposed to the wear of the stock rail of the switch rail during the service process.The wear will cause the change of railhead profile and the relative positions of the switch rail and the stock rail,which will directly affect the wheel-rail contact state and wheel load transition when a train passes the turnout and will further impose serious impacts on the safety and stability of train operation.The purpose of this paper is to provide suggestions for wear management of high-speed turnout.Design/methodology/approach-The actual wear characteristics of switch rails of high-speed turnouts in different guiding directions were studied based on the monitoring results on site;the authorized wear limits for the switch rails of high-speed turnout were studied through derailment risk analysis and switch rail strength analysis.Findings-The results show that:the major factor for the service life of a curved switch rail is the lateral wear.The wear characteristics of the curved switch rail of a facing turnout are significantly different from those of a trailing turnout.To be specific,the lateral wear of the curved switch rail mainly occurs in the narrower section at its front end for a trailing turnout,but in the wider section at its rear end when for a facing turnout.The maximum lateral wear of a dismounted switch rail from a trailing turnout is found on the 15-mm wide section and is 3.9 mm,which does not reach the specified limit of 6 mm.For comparison,the lateral wear of a dismounted switch rail from a facing turnout is found from the 35-mm wide section to the full-width section and is greater than 7.5 mm,which exceeds the specified limit.Based on this,in addition to meeting the requirements of maintenance rules,the allowed wear of switch rails of high-speed turnout shall be so that the dangerous area with a tangent angle of wheel profile smaller than 43.68 will not contact the switch rail when the wheel is lifted by 2 mm.Accordingly,the lateral wear limit at the 5-mm wide section of the curved switch rail shall be reduced from 6 mm(as specified)to 3.5 mm.Originality/value-The work in this paper is of reference significance to the research on the development law of rail wear in high-speed turnout area and the formulation of relevant standards.展开更多
随着铁路道岔运用时间的增加,尖轨磨耗将加剧。当尖轨磨耗达到一定程度时,会威胁铁路运输安全。因此在日常检修、维护中需测量尖轨磨耗量。结合现场使用的道岔尖轨结构形式和截面尺寸,提出一种基于轨底定位方式的尖轨磨耗测量方法,设计...随着铁路道岔运用时间的增加,尖轨磨耗将加剧。当尖轨磨耗达到一定程度时,会威胁铁路运输安全。因此在日常检修、维护中需测量尖轨磨耗量。结合现场使用的道岔尖轨结构形式和截面尺寸,提出一种基于轨底定位方式的尖轨磨耗测量方法,设计新型尖轨磨耗测量仪,并评定新型尖轨磨耗测量仪测量不确定度。结果表明:新型尖轨磨耗测量仪测得的垂直磨耗和侧面磨耗结果扩展测量不确定度分别为0.19 mm和0.12 mm (包含因子均取2),均小于目标测量不确定度,满足现场尖轨磨耗的测量需求。展开更多
基金supported by the Fund of China Academy of Railway Sciences Corporation Limited (Grant Nos.2022YJ177 and 2022YJ088).
文摘Purpose-It is quite universal for high-speed turnouts to be exposed to the wear of the stock rail of the switch rail during the service process.The wear will cause the change of railhead profile and the relative positions of the switch rail and the stock rail,which will directly affect the wheel-rail contact state and wheel load transition when a train passes the turnout and will further impose serious impacts on the safety and stability of train operation.The purpose of this paper is to provide suggestions for wear management of high-speed turnout.Design/methodology/approach-The actual wear characteristics of switch rails of high-speed turnouts in different guiding directions were studied based on the monitoring results on site;the authorized wear limits for the switch rails of high-speed turnout were studied through derailment risk analysis and switch rail strength analysis.Findings-The results show that:the major factor for the service life of a curved switch rail is the lateral wear.The wear characteristics of the curved switch rail of a facing turnout are significantly different from those of a trailing turnout.To be specific,the lateral wear of the curved switch rail mainly occurs in the narrower section at its front end for a trailing turnout,but in the wider section at its rear end when for a facing turnout.The maximum lateral wear of a dismounted switch rail from a trailing turnout is found on the 15-mm wide section and is 3.9 mm,which does not reach the specified limit of 6 mm.For comparison,the lateral wear of a dismounted switch rail from a facing turnout is found from the 35-mm wide section to the full-width section and is greater than 7.5 mm,which exceeds the specified limit.Based on this,in addition to meeting the requirements of maintenance rules,the allowed wear of switch rails of high-speed turnout shall be so that the dangerous area with a tangent angle of wheel profile smaller than 43.68 will not contact the switch rail when the wheel is lifted by 2 mm.Accordingly,the lateral wear limit at the 5-mm wide section of the curved switch rail shall be reduced from 6 mm(as specified)to 3.5 mm.Originality/value-The work in this paper is of reference significance to the research on the development law of rail wear in high-speed turnout area and the formulation of relevant standards.
文摘随着铁路道岔运用时间的增加,尖轨磨耗将加剧。当尖轨磨耗达到一定程度时,会威胁铁路运输安全。因此在日常检修、维护中需测量尖轨磨耗量。结合现场使用的道岔尖轨结构形式和截面尺寸,提出一种基于轨底定位方式的尖轨磨耗测量方法,设计新型尖轨磨耗测量仪,并评定新型尖轨磨耗测量仪测量不确定度。结果表明:新型尖轨磨耗测量仪测得的垂直磨耗和侧面磨耗结果扩展测量不确定度分别为0.19 mm和0.12 mm (包含因子均取2),均小于目标测量不确定度,满足现场尖轨磨耗的测量需求。
