Research purposes; The existing Line 2 and its east extension line of Shanghai metro is connected on the elevated bridge between Longyang Road and Zhangjiang Hi - Tech Region with big technical difficulty. This was the first for China to line and move the full track bed on the elevated bridge. Based on the successful completion of it, the introduction is given in this paper to the design idea and construction plan for lining and moving the full track bed for the purpose of providing the reference to the similar works.Research conclusions;According to the project characteristics that the work occupation time was short, the precision requires high and it was the first time to do, the several design plans were made. The rail cap was poured between the existing rail and tie on the Beam 3, the short track caps were prefabricated in the beam manufacturing field for the beds on the 4-7 beams and the in - site welding was conducted for the welded rail track, with successful completion of the project. The project can be considered to explore the way of upgrading and maintaining the full track bed and can provide the reference to the similar works.%研究目的:上海地铁2号线既有线和2号线东延伸在龙阳路与张江高科区间的高架梁上完成拨接,为国内首次在高架梁上整体道床的拨移工程,具有很大的技术难度.本文结合该项目的成功实施,阐述整体道床拨移工程的设计思路及施工方案,对类似工程具有借鉴意义.研究结论:针对该工程封锁时间短、精度要求高、首次实施等特点,比选多种设计方案.3号梁采用了在既有轨枕间浇注承轨台方案,4～7号梁道床采用在梁场预制纵向短枕承轨台的方案,无缝线路采用现场焊接方案,并成功实施拨移工程.该工程对整体道床改造、维修方法的探索,对城市轨道交通延伸线路与既有线的轨道拨接具有重要的参考意义.
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