地铁线路纵断面设计探讨

Design and Discussion on Line Profile of Metro

地铁线路尤其是地下线路的纵断面设计不同于常规铁路的线路纵断面设计,针对其自身特点,结合天津地铁1、3、6号线等具体工程设计实践,论述车站和区间线路埋置深度、车站站坪及站端节能型坡度设计、竖曲线与最小坡段长度的配合、区间线路纵坡设计,论述最大坡度的设置条件及注意事项,并着重就现行《地铁设计规范》对相邻坡度差最大限值尚无明确规定的问题,从行车平稳性和乘客舒适度、方便设计、有利施工、减少轨道养护维修等方面进行较深入研讨,并提出建议性意见:坡度差限值30‰,困难时35‰。

Metro line, especially the profile design of the underground line is different from the profile design of conventional railway line. According to its own characteristics, combined with engineering design practice of Tianjin Metro line 1, line 3 and line 6, this article discusses several issues, including the embedment depths of station line and section line, the designs of energy-efficient gradients of the station ground and the station end, the coordination between the vertical curve and the length of minimum slope, and the longitudinal slope design of the section line. Also, this article discusses the process conditions and the precautions of the maximum gradient. Furthermore, aiming at the problem that the limit value of maximum difference between the adjacent slopes is not yet specified clearly in the current standard, Code for Design of Metro, and through in-depth researching and discussing on the smoothness, comfort level, convenience performance both in design and construction, less track maintenance and other aspects, this article puts forward the suggestions that the limit value of maximum slope difference should be 30‰, 35‰ at need.