跨座式单轨折返站折返能力研究

Research on the Turn-back Capability of Straddle Type Monorail Turn-back Station

折返站折返能力是城市轨道交通系统能力的控制因素,跨座式单轨系统与传统的钢轮钢轨系统不同,其道岔转辙时间长,但加减速性能更优,车站布置形式也不尽相同,采用传统的经验计算法得出的折返能力明显低于其实际能力,在工程设计中不利于系统选型和节省投资。为了论证跨座式单轨系统能够达到更高的折返能力,通过对CBTC信号控制系统的原理进行分析,针对跨座式单轨系统适用的折返站配线布置形式,建立列车进站起模点的计算模型,提出折返能力计算公式,并结合工程实际项目进行验算。研究结果表明,轻型跨座式单轨系统在车体尺寸、加减速性能等方面具有明显优势,再配置替换梁型道岔以提高侧向通过速度,其折返能力可达到30对/h及以上,远大于经验值24对/h,该计算结果对跨座式单轨项目的系统选型和列车编组选择,以及单轨国标的修编提供了可量化的参考和依据。

The turn-back capacity of turn-back station controls the capacity of urban rail transit system.Straddle type monorail system is different from the traditional steel wheel rail system.Its switching time is long,but its acceleration and deceleration performance is better with different station layout.The turn-back capacity obtained by traditional experience calculation method is obviously lower than its actual capacity,which is not conducive to system selection and saving investment in engineering design.In order to demonstrate that the straddle monorail system can achieve higher turn-back capacity,this paper analyzes the principle of CBTC signal control system,establishes the calculation model of the starting point of the train entering the station,puts forward the calculation formula of turn-back capacity,and checks the calculation with the actual project.The research results show that the light straddle type monorail system is obviously superior in car body size,acceleration and deceleration performance,etc.,and it can reach more than 30 pairs/h by replacing beam type turnout to improve the lateral passing speed,which is far greater than the experience value of 24 pairs/h.The calculation results provide quantifiable references for the system selection and train formation selection of straddle type monorail project,as well as for the revision of monorail national standards.