地铁3.4 m线间距单渡线总体方案研究

研究目的:地铁建设项目利用既有双线隧道工程,由于限界限制,线间距只有3.4 m,如此小的线间距设置单渡线,国内外工程实例尚无,设置3.4m线间距单渡线可直接利用既有隧道工程,对盘活国有资产降低工程造价,有着重大意义。研究方法:研究道岔设计参数的制定原则,分析我国铁路道岔、城轨交通道岔设计参数的选用情况,确定合理的单渡线设计参数,进而对单渡线作安全性检算并选择合理的结构。研究结论:地铁采用3.4 m线间距单渡线。道岔选用的设计参数值,不低于两端单开道岔设计参数值,经过安全性检算,其容许通过速度为30 km/h时,地铁车辆行驶在单渡线时能保证行车安全及旅客舒适度。单渡线连接部分结构方案是合理的,给设计3.4 m线间距单渡线提供了可靠的支持。

Research on Overall Program of Laying Single Crossover with 3.4 m Distance between Centers of Lines for Metro

Research purposes: The distance between centers of lines was just 3.4 m owing to the limitation of clearance in construction of metro in order to make use of existing double track tunnel.There was no construction example of laying(single) crossover in such short distance at home and abroad.However,it is great significant to lay single crossover with(3.4 m) distance between centers of lines for making use of existing tunnel and state asset,and reducing construction cost.Research methods:The research was made on the principle for working out turnout design parameters,the analysis was made for choosing turnout parameters by railway and metro and the rational design parameters of single crossover were(ascertained).Then the safety of single crossover was checked by calculation and the rational structure of single crossover was selected.Research conclusions:If the single crossover with 3.4 m distance between centers of lines is adopted in metro,the(values) of design parameters for turnout will not smaller than that of simple turnout at both ends.Under this condition,the running safety of train and comfortableness can be guaranteed when the subway train passes through the single(crossover) at the tolerated through speed of 30 km/h.The program of connection structure of single crossover is rational,which provides reliable support to design of single crossover with 3.4 m distance between centers of lines.