无缝线路钢轨实际锁定轨温超声法测量研究  

Research on Ultrasonic Measurement of Actual Stress-free Temperature of Continuously Welded Rail

作　　者：岳国军 Yue Guojun(Tangshan Railway Maintenance Section,China Railway Beijing Bureau Group Co.Ltd.,Tangshan 064000,China)

机构地区：[1]中国铁路北京局集团有限公司唐山工务段,河北唐山064000

出　　处：《石家庄铁道大学学报（自然科学版）》2021年第2期87-92,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：锁定轨温是无缝线路养护、管理和维修的重要参数,如何实现无缝线路实际锁定轨温的准确快速测量,是铁路工务部门迫切需要解决的问题。基于声弹性理论分析了钢轨纵向温度应力超声临界折射纵波检测方法,搭建多通道超声应力检测试验平台,对钢轨进行不同超声频率与测点位置的压载试验,开展超声与应变片测试温度应力的对比研究,利用温度应力、实时轨温和设计锁定轨温的关系计算实际锁定轨温。通过对新建线路的现场测试,验证超声法实际锁定轨温测量满足工程需要。Stress-free temperature is an important parameter for the maintenance,management and repair of continuously welded rail,how to achieve the accurate and rapid measurement of the stress-free temperature of continuously welded rail has become an urgent problem for the railway engineering department.Based on the principle of acoustic elasticity,this paper analyzed the ultrasonic critical refraction longitudinal wave detection method for the longitudinal temperature stress of rail,built a multi-channel ultrasonic stress testing experimental platform to conduct ballast tests with different ultrasonic frequencies and measuring point positions on rail,carried out the comparative study of temperature stress between ultrasonic and strain gage testing,and calculated stress-free temperature by using the relationship between temperature stress,real-time rail temperature and design stress-free temperature.Through the field test of the newly-built line,it was verified that the ultrasonic method of stress-free temperature rail temperature measurement meet the engineering needs.

关 键 词：无缝线路 实际锁定轨温 钢轨应力 超声波 

分 类 号：U213[交通运输工程—道路与铁道工程]