城市地下道路视距验算及优化设计探讨
2018-06-08陈劼
陈劼
【摘 要】随着我国经济和社会的发展,地下道路在我国城市核心区得到了越来越多的应用。地下道路作为一个封闭的结构体,视距条件对其通行的安全、顺畅有较大影响。本文结合郑州107辅道快速化改造工程隧道段工程设计,采用横净距解析法和视距图解法进行地下道路视距验算,论述了优化道路线形设计、设置视距平台、合理交通管控等视距优化设计措施,验证了工程设计的可靠性和合理性,并为其它类似工程设计提供了有益的参考。
【关键词】地下道路;解析法视距验算;图解法视距验算;视距优化设计;视距平台设计
中图分类号: U412.373.1 文献标识码: A 文章编号: 2095-2457(2018)08-0001-003
Discussion on Urban Underground Road Sight Distance Calculation and Optimizing Design Measures
CHEN Jie
(Shanghai Municipal Engineering Design Institute General Corporation (Group)Co.,Ltd.,Shanghai 200092,China)
【Abstract】With the economic and social development of our country, urban underground road have been widely used in urban central areas. As a closed structural body, safe and smooth traffic of an underground road is significantly influenced by its sight distance conditions. This article exemplifies the underground road bid section design in the rapid road transformation of Zhengzhou G107. It adopts horizontal clear distance analytical method and sight distance graphic method to calculate the underground road's sight distance. This article also discusses several measures of optimizing sight distance design, including optimizing roadway alignment design, setting sight distance platform, reasonable traffic management and control, etc. Finally, it verifies reliability and rationality of the engineering design and provides useful reference for other similar projects.
【Key words】Urban underground Road;Sight distance calculation by analytic method;Sight distance calculation by graphic method;Sight distance optimizing design;Sight distance platform design
0 引言
隨着我国经济高速发展、城市化进程加快、基础设施飞速建设,城市交通拥堵、土地资源稀缺、环境污染越来越引起大众关注。许多城市核心区道路承担交通功能复合,交通已趋于饱和,难以适应城市发展需求,亟需扩容改造。但受地形地貌、历史沿革、景观保护等限制,采用地面道路拓宽和高架立体扩容改造难度较大且效果一般。而地下道路具有景观环境友好,地方出行顺畅,可提升周边土地价值,工程造价合理等优点,应用在越来越多的城市。
地下道路是一个封闭的结构体,通行环境与地面道路存在较大差异,其视距条件受侧墙、顶板等影响较大,如图1。我国地下道路的交通事故类型中,追尾、侧翻、撞击侧墙类事故比例可占到90%左右。因此,在地下道路设计过程中对全线进行视距验算,并在视距不良处采取合理改善措施,对地下道路运营安全至关重要。……
