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通过对城市地下道路设计中一些具有研究价值的设计要点进行归纳、探讨、分析和研究,为后续的城市地下道路工程提供一些可借鉴的经验。以具体工程为例,对比分析了常用明挖闭合框架结构的受力特点。对地下道路内部设置检修道的必要性、疏散通道的设置间距和疏散方式、通风方式等内容进行分析和对比。文章指出,明挖闭合框架结构采用折板框架结构具有较明显的优势,且隧道内宜设置检修道;对于盾构法地下道路,隧道内可不设置检修道以节约空间,宜采用纵横向相结合的疏散方式;城市地下道路可采用“集中排放+空气净化站”或“分散式多点排放”的方案,其中“集中排放+空气净化站”的方式可减少项目区域污染物排放量,但投资较高,建议在高端定位的大型城市中心区采用。
Through summarizing, discussing, analyzing and studying some valuable design points in the design of underground urban roads, this paper provides some lessons for the follow-up underground urban road projects. Taking a concrete project as an example, the force characteristics of the commonly used open cut closed frame structure are compared and analyzed. The necessity of setting up inspection roads inside underground roads, the spacing of evacuation routes and the evacuation ways and ventilation methods are analyzed and compared. The article points out that the structure of the open-cut closed frame has the obvious advantage of adopting the folded-plate frame structure and the inspection track should be set in the tunnel; for the underground road of the shield method, there is no need to set up the inspection track in the tunnel to save the space. Of the way of evacuation; urban underground roads can be used “centralized emission + air purification station” or “decentralized multi-point emission” program, including “centralized emission + air purification station” approach can reduce pollution in the project area However, the higher the investment, it is recommended to adopt the high-end positioning of large urban centers.