地铁终点站存车线和预留正线排烟方案研究

Smoke Exhaust Schemes for Metro Terminal Station Storage Tracks and Reserved Main Lines

[目的]地铁终点站存车线和预留正线的排烟路径与中间站各类配线的均不相同,因此需研究适宜其的排烟方案。[方法]介绍了现行标准中地下区间进行纵向、横向排烟设计的一般要求。以北京地铁房山线北延工程终点站丰益桥南站为例,设计并对比分析了其存车线及预留正线的纵向、横向排烟方案,应用SES软件模拟分析了纵向排烟时两配线内不同位置发生火灾时的排烟路径和风速。指出了现行标准中未明确指出的地铁终端线路的排烟设计特点。[结果及结论]地铁终点站存车线和预留正线无论采用纵向排烟方案还是采用横向排烟方案,都能达到标准中地下区间的排烟设计要求;地铁终点站存车线和预留正线具有横向排烟的条件,建议优先采用投资更少、运营维护工作量更小的横向排烟方案。

[Objective]The smoke exhaust paths for metro terminal station storage tracks and reserved main lines are different from those for various auxiliary lines in middle stations,thus it is necessary to study suitable smoke exhaust schemes for these scenarios.[Method]The general requirements in current standards for vertical and horizontal smoke exhaust design in underground interval are introduced.Taking Fengyiqiao South Station,the terminal station of Beijing Subway Fangshan Line North Extension project,as example,the vertical and horizontal smoke exhaust schemes for the storage track and the reserved main line are designed and comparatively analyzed.SES software is applied to simulate and analyze the smoke exhaust paths and wind speeds at different locations on the two auxiliary lines during a fire event.The smoke exhaust design characteristics of metro terminal lines that are not explicitly mentioned in current standards are highlighted.[Result&Conclusion]Whether adopting vertical or horizontal smoke exhaust schemes,metro terminal storage tracks and reserved main lines can meet the smoke exhaust design requirements for underground intervals outlined in the standards.Terminal storage stacks and reserved main lines have conditions suitable for horizontal smoke exhaust,therefore it is recommended to g prioritize the use of horizontal smoke exhaust schemes due to lower investment and less operation-maintenance workload.