芜湖轨道交通项目跨坐式单轨接触轨安装中的技术问题及解决措施

Technical Issues and Solutions in Straddle Monorail Contact Rail Installation for the Rail Transit Project in Wuhu

目的:跨坐式单轨接触轨的安装精度会直接影响跨坐式单轨车辆集电靴通过的安全性和平顺性,而且安装精度不高将导致闪络拉弧现象并增大碳刷磨耗。为此需提高跨坐式单轨接触轨的安装质量,对接触轨安装过程中产生的问题进行分析,并提出解决措施。方法:基于车辆集电靴动态位移及接触轨安装限界条件、CJ/T 414—2012《城市轨道交通钢铝复合导电轨技术要求》及产品维护手册等,通过芜湖轨道交通1、2号线跨坐式单轨接触轨安装完成后的多组施工现场测量数据,针对接触轨安装过程中遇到的道岔分段绝缘器与道岔的干涉问题,以及分段绝缘器与接触轨平面超差问题,分析问题原因,并提出解决措施。结果及结论:由于施工图设计阶段未充分考虑到不同转弯半径道岔摆动时道岔分段绝缘器间隙的影响,故产生了道岔分段绝缘器与道岔的干涉问题。对此,可采用局部调整道岔或调整分段绝缘器施工图尺寸的解决措施。受钢铝复合轨及分段绝缘器本体的制造精度、轨道梁本体的平顺度、不同型材的热膨胀系数、外界环境温度及紧固扭矩等因素的影响,设备安装后在钢铝复合轨轨面与分段绝缘器的表面存在平面超差问题。可通过在安装使用说明书要求范围内调整紧固力矩大小,在局部无法调整位置打磨来解决该问题。

Objective:The installation accuracy of the straddle monorail contact rails directly affects the safety and smoothness of the straddle monorail vehicle collector shoe passing through.Moreover,low installation accuracy can lead to arcing and increased carbon brush wear.Therefore,it is necessary to improve the installation quality of the straddle monorail contact rails,analyze the problems that occur during the installation process,and propose corresponding solution measures.Method:Based on the dynamic displacement of the collector shoe and the installation limits of the contact rails,as well as the technical requirements for steel-aluminum composite conductive rails in CJ/T 414-2012 Technical Requirements of Aluminum-Steel Conductor Rail for Urban Rail Transit and the product maintenance manual,multiple sets of on-site measurement data are obtained after the installation of straddle monorail contact rails for Wuhu Rail Transit Line 1 and Line 2.For the problems encountered during the installation of the contact rails,such as the interference between segmented insulators and turnouts and the excessive planar deviation between segmented insulators and contact rails,causes are analyzed and corresponding solutions are proposed.Result&Conclusion:The influence of segmented insulator clearance for switching turnouts of different radii is not fully considered during the design stage,thus the interference between segmented insulators and turnouts occurred.To address this issue,measures such as local adjustment of turnouts or adjustment of segmented insulator dimension in construction drawings can be adopted.Due to factors such as the manufacturing accuracy of steel-aluminum composite rail and segmented insulators,the smoothness of track beam,the thermal expansion coefficient of different profiles,the ambient temperature and tightening torque,there may be excessive planar deviation between the surfaces of steel-aluminum composite rail and segmental insulators after equipment installation.This problem can be solved by adjusting the tightening torque within the range required by the installation manual and performing local grinding in areas where adjustment is not possible.