沿海大风区的线岔平面布置

接触网线岔是接触网故障的多发区。广梅汕铁路地处潮汕地区,属于沿海大风气候,需要优化接触网线岔的平面布置才能满足安全运行要求。目前线岔计算方法相对粗糙,有必要针对大风区的线岔布置进行计算研究。本文采用分段分析法将线岔分为一般悬挂区、始触区等,首先建模分段部分并运用流体计算软件仿真模拟沿海大风区环境,数值求解分段部分风荷载,然后利用当量计算法计算最大风偏移值,最终根据仿真计算结果确定线岔各部分拉出值允许范围,并整体优化线岔平面布置,实践结果表明该方法适应于沿海大风区环境,具有借鉴意义,值得推广。此外研究还发现:无交叉线岔相较交叉线岔在抗风性能方面更具有优势;当跨距在35 m以上,风速在25 m/s以上时,采用分段分析法计算结果更加准确。

Overhead crossing above turnout of track is a zone where OCL faults occur frequently.Guangzhou-Meizhou-Shantou railway locates in Chaozhou-Shantou area,a coastal gale area.It is necessary to optimize the arrangement of overhead crossings so as to meet the requirements of safe operation,and it is necessary to study the arrangement of overhead crossings in windy area since the calculation method for arrangement of overhead crossings is relatively inaccurate.The paper introduces the procedures of the study that the overhead crossings are divided into the generic suspension zone and initial contact zone,fluid calculation software is used to simulate the environment of coastal gale area on established models of segmented zones,numeral solution is used to the wind load of the segmented zones,equivalent calculation method is used to calculate the maximum wind deviation,the permissible range of stagger values for several zones of overhead crossings are finalized in accordance with the simulation and calculation results,and the layout of the overhead crossings are optimized integrally.The practical results show that the method is suitable for coastal gale area environment,it has values of reference and popularizing.In addition to the study,conclusions are also obtained:the non-crossing overhead crossing has advantages compared with the crossing type overhead crossings;the calculation result by segmented calculation is more accurate with the span longer than 35 m and wind speed exceeding of 25 m/s.