结合京广、津浦、京九等干线一至六期提速施工,介绍了在既有线路的改造中可动心轨辙叉提速道岔更换的特点、前期准备工作、整组道外预铺流程、点前准备、封闭换岔、点后养护等施工组织及施工工艺,为同类工程提供借鉴。 Combined with the speeding construction of the first to the sixth phase of Beijing-Guangzhou, Jinpu and Beijing-Kowloon main lines, this paper introduces the characteristics of replaceable movable turnout speed-changing turnout in the reconstruction of existing lines, preliminary preparation work, , Closed bifurcation, point conservation and other construction organization and construction technology, to provide reference for similar projects.