与既有地铁线路接轨道岔施工方案研究

Research on Construction Program of Turnout for Track Joining with Existing Track of Metro Line

研究目的:以上海地铁M8线与既有的上海地铁1号线在人民广场站接轨的工程为例,对地铁接轨道岔的施工方法、施工工艺进行分析研究。研究方法:搜集既有线轨道设计标准、调查研究接轨道岔现场情况及工作环境,制定施工设计原则,选择合理的施工方案并结合实际情况选用新材料。研究结果:与既有地铁线路接轨道岔施工方案,最终采用间隔抽换正线与道岔共用短轨枕和扣件。研究结论:施工前应做好既有线无缝线路的放散,施工全部结束后恢复道岔两端的无缝线路,并加强两端线路的锁定;FFU合成轨枕侧面应做出凹凸或花纹,新老道床混凝土接触面涂刷界面剂;道岔道床始、终端及道岔道床内设置伸缩缝,排杂散电流钢筋总截面积应满足要求并保证电气连接,尤其注意侧股道床钢筋与直股钢筋的绑扎或焊接。

Research purposes： Taking the construction practice of Track M8 joining with Line 1 of Shanghai Metro at People＇s Square Station as an example, the analyses and research are done on the construction method and technique. Research methods： Based on the current design standard of track and according to the conditions of working environment on the site of track joining, the construction and design principles are worked out, and the rational construction program and the new materials to be used are decided. Research results ：The construction program that the short ties and fastenings are used by interval replaced main track and turnout jointly is adopted Research conclusions：The existing jointless track should be spread before joining, and the jointless track on the both sides of turnout should be recovered and blocked. The both sides of FFU compound tie should be concave - convex or figured, and the interracial agent should be painted on contact surface of concretes between new and old roadbeds. The expansion joint should be remained on both sides of roadbed and in the roadbed of turnout. The total area of steel for dispersing stray current should meet the requirement with good electrical connections, especially attention should be paid to banding or welding between reinforces of side strand roadbed and straight roadbed.