北京轨道交通新机场线轨道系统设计综述

Comprehensive Introduction of Track System Design of New Airport Line in Beijing Urban Rail Transit

北京轨道交通新机场线一期工程设计速度为160 km/h,突破了既有城市轨道交通规范规定的速度范畴,既有的轨道系统结构形式已无法满足本工程高速行车的需求。同时,本工程还存在通过地段人工地物复杂多样、人员疏散性要求高、建设工期紧张等问题,给轨道系统设计带来了诸多挑战。在没有设计先例、没有规范遵循的情况下,采用"城际"标准与"地铁"标准相结合的设计思路与方法,设计了适用于不同地段的轨道系统结构形式,提出了基于轨面平顺性控制的成套技术方案。北京新机场线的成功开通运营表明,采用"城际+地铁"相结合的方法可解决更高速度下城市轨道交通轨道系统结构的高稳定性、高平顺性等设计问题。该设计思路与方法可为今后城市轨道交通类似线路提供设计范例,同时也为市域快线及市郊铁路轨道系统设计提供了新思路。

The design speed of Beijing new airport line construction at the first stage is 160 km/h,which has broken through the speed range covered by existing urban rail transit regulations.The traditional track structure and its components in urban rail transit could not meet the requirement of Beijing new airport line.Meanwhile,taking into consideration the complexity of geology conditions,the high demand for emergency evacuation and tight construction period,the track structure design in the new airport line is facing a lot of new challenges.In the absence of design precedents and norms,in order to solve the above-mentioned challenges in the design of the new airport line,the design ideas and methods of combining "intercity" standards with "subway" standards is adopted.Refined track structure types are proposed for the application in the different sections and the complete technical scheme for the rail surface smoothness controlling is proposed.Results have shown that with the successful opening and operation of the Beijing New Airport Line,the combination of "intercity+subway" successfully solved the problem of high stability and high smoothness of urban rail transit rail system structures at higher speeds,which proves the validation of the design method.The method in this paper can provide design examples for future urban rail transit similar lines,and also provide new ideas for the design of urban express lines and suburban railway track systems.