既有高铁车站改建实施方案探讨

Exploration on the Implementation Plan of the Reconstruction of the Existing High-speed Railway Station

研究目的:随着我国高铁网的不断扩充,出现了既有车站没有预留条件或突破原规划的接轨需求,采用无砟轨道的高铁车站有非封闭改造的要求。运营高铁车站无砟轨道及道岔的改建,需要封锁改建股道甚至停开部分动车,会引起运行图的调整,与正常运营部分需要物理隔离,运输、安全风险大。无论是新线引入还是运营老化,在"天窗"时间段对运营无砟轨道进行"破无砟"改造成为铁路建设者们必须攻克的难题。研究结论:(1)既有高速铁路车站改造,有条件时优先采用封闭施工的有砟轨道、长枕埋入式无砟道岔改造方案;(2)高铁车站或区间无砟轨道在封闭施工、物理隔离前提下,土建、"四电"统筹实施,无砟轨道工程可按分步拆除、无砟道岔安装的步骤实施;(3)非封闭施工利用天窗时间完成路基、桥涵及四电工程,采用循环施工方法,通过采用轨道板和钢垫梁等相关措施,可实现无砟轨道施工、第二天白天慢速运行的目标,对工程材料、施工工艺是极大的考验;(4)本研究成果对其他运营高铁车站的改建具有借鉴意义。

Research purposes:With the continuous expansion of China’s high-speed railway network in the past 10 years,the connection requirements for existing stations without reserved conditions or breaking through the original plan,and the requirements of non-closed transformation for ballastless high-speed railway stations have emerged.In order to rebuild the ballastless track and turnout of high-speed railway stations,it is necessary to close the rebuilt track or even stop some bullet trains,which will cause the adjustment of operation diagram and the physical isolation from the normal operation part.Whether it is the introduction of new line or the aging of operation,it has become a difficult problem for railway builders to transform the operation ballastless track during the period of"skylight"period.Research conclusions:(1)For existing high-speed railway station reconstruction,ballastless track and ballastless turnout reconstruction schemes with closed construction should be preferred when conditions are favorable.(2)Under the premise of closed construction and physical isolation,civil engineering and"four power"should be carried out in a coordinated way.Ballastless track engineering can be carried out according to the steps of demolishment step by step and installation of ballastless turnout.(3)In the non-closed construction,the roadbed,bridge and culvert and four power projects are completed by using skylight time.By adopting circular construction method and adopting relevant measures such as track slab and steel cushion beam,the goal of ballastless track construction and slow running in the next day can be achieved,which is a great test for engineering materials and construction technology.(4)The research results have reference significance for the reconstruction of other operating high-speed railway stations.