便携式无缝线路应力均匀化调整装置设计与应用
贺相林1刘平1路宏遥2,3吴文涛3
Design and Application of Portable Continuous Welded Rails Stress Homogenization Adjustment Device
HE Xianglin1LIU Ping1LU Hongyao2,3WU Wentao3
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作者信息:1.国能朔黄铁路发展有限责任公司肃宁分公司，062350，河北
2.上海市轨道交通结构耐久与系统安全重点实验室，201804，上海
3.上海工程技术大学城市轨道交通学院，201620，上海
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Affiliation:1.Suning Branch, Guoneng Shuohuang Railway Development Co., Ltd., 062350, Hebei, China
2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, 201804, Shanghai, China
3.School of Urban Rail Transportation, Shanghai University of Engineering Science, 201620, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.12.017
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中图分类号/CLCN:U213.9
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栏目/Col:学术专论
摘要:
［目的］为了及时、准确地掌握无缝线路内部应力的分布情况，减轻无缝线路应力调整作业人力、物力的投入，有必要对无缝线路的应力调整问题进行研究。［方法］介绍了无缝线路内部温度分布不均匀现象产生的原因，并结合红外热成像技术明确了其温度分布的特性；设计了一种便携式无缝线路应力均匀化调整装置，并将其应用于实际工程中。［结果及结论］锁定轨温的随机差异、气象参数与材料的客观差异是导致无缝线路内部温度分布不均的原因；实际运营线路中，相邻扣件位置处存在温度差异，温度差值为1.8℃，致使钢轨局部产生2.77MPa的温度应力极差；便携式无缝线路应力均匀化调整装置可激发钢轨的最大加速度值为305.944m/s2，钢轨纵向波动位移值为0.014mm，无缝线路内部应力因高频激振而获得有效释放。
Abstracts:
［Objective］ In order to timely and accurately grasp the internal stress distribution of continuous welded rails (CWR) and reduce the investment of manpower and material resources in CWR stress adjustment operations, it is necessary to study the issues of CWR stress adjustment. ［Method］ The causes for uneven temperature distribution in CWR are introduced, and the characteristics of temperature distribution in CWR are clarified by combining infrared thermal imaging technology; a portable CWR stress homogenization adjustment device is designed and applied in actual projects. ［Result & Conclusion］ The random differences in locked rail temperature, and the objective differences in meteorological parameters and materials are the reasons for the uneven temperature distribution inside CWR. On the actual operating line, there is a temperature difference at the position of adjacent fasteners, with a temperature difference of 1.8 ℃, which causes a local temperature stress extreme difference of 2.77 MPa in the steel rail. The portable CWR stress homogenization adjustment device can excite the maximum acceleration value of the rail to 305.944 m/s2, and control the longitudinal fluctuation displacement value of the rail to 0.014 mm. The CWR internal stress is thus effectively released due to the high-frequency excitation.
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