摘要
为满足30 t轴重重载道岔护轨强度及变形要求,给出不设间隔铁(方案一)、采用间隔铁(方案二)两种护轨垫板方案,有限元分析结果表明,方案二在竖向变形、水平变形和板底拉应力方面均小于方案一,故推荐方案二为试验方案。试验结果表明,既有线护轨强度和变形最大值分别为171.2 MPa、2.235 mm,满足重载道岔使用要求,但在长期观测中,发现有护轨间隔铁螺栓折断现象,系螺栓提前承受轮载传递的横向力所致。采取的优化措施:取消间隔铁结构,在基本轨外侧设置轨撑,底板宽度由180 mm增至220 mm,撑板宽度由70 mm增至130 mm,以提高护轨垫板整体强度。优化后的护轨垫板在瓦日线、张唐线等重载铁路道岔应用,使用效果良好。
In order to meet the strength and deformation requirements of the guard rail of heavy haul turnout with 30 t axle load,two schemes of guard rail plate without spacing(scheme 1)and using spacing(scheme 2)were proposed.The finite element analysis results showed that the vertical and horizontal deformation,and tensile stress at the bottom of plate in scheme 2 are smaller than those in scheme 1.Scheme 2 was recommended as the test scheme.The maximum values of strength and deformation of guard rail measured on the existing line were 171.2 MPa and 2.235 mm respectively,which met the requirements of heavy load turnout.However,during the long-term observation,it was found that bolts of guard rail spacing were invalid,which was caused by the lateral force transmitted by wheel load in advance.The optimization measures were adopted as follows:canceling the spacing structure,setting the rail brace outside the stock rail,increasing the width of the plate bottom from 180 mm to 220 mm,and the width of the brace plate from 70 mm to 130 mm.The measures could improve the overall strength of the guard rail plate.The optimized guard rail plate has been applied in turnouts of heavy haul railways such as Watang-Rizhao line and Zhang Jia Kou-Tang Shan line,and the application effect is good.
作者
何雪峰
许有全
高亮
禹雷
He Xuefeng;Xu Youquan;Gao Liang;Yu Lei(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China;Beijing Jiaotong University,Beijing 100044,China)
出处
《铁道勘察》
2021年第4期133-137,共5页
Railway Investigation and Surveying
基金
铁道部科技研究开发计划重点课题(2011G028-A)。
关键词
30
t轴重
重载道岔
护轨垫板
结构优化
30 t axle load
heavy-haul turnout
guard rail plate
structural optimization
