跨座式单轨交通线路设计重点问题探讨

结合跨座式单轨的系统特点和应用案例,探讨跨座式单轨线路设计中涉及的道路横断面调整、高架桥梁结构选择、环评影响、敷设方式选择等典型问题,并根据重庆单轨交通2、3号线多年的运营情况,总结和分析规划设计过程中的经验教训。单轨线路线形与城市道路线形应匹配,尽量采用标准桥墩,在条件不允许时,可采用不对称的T形、倒L形、门式墩等非标准桥墩。梁体形式需结合桥梁跨度、平面曲线半径、施工方法综合选择。单轨线路布设时,应结合平面曲线半径,比选路中、路侧敷设方案,降低环境影响。跨座式单轨敷设方式并非全部采用高架线,局部采用地下线可灵活适应地形高差、提高运营条件、有利交通枢纽衔接、符合综合交通体系建设等,具有一定必要性。

Discussion on the Line Design of Straddle Type Monorail

Combined with the characteristics of straddle type monorail and some application cases,this paper discusses some typical problems related to the design of straddle type monorail,such as the adjustment of road cross-section,the selection of viaduct structure,the environmental impact and the selection of laying methods.According to the operation of Chongqing Line 2 and Line 3 in recent years,the paper also analyzes some planning and design deficiencies.It is proposed that the straddle monorail line should match the urban road alignment by adopting standard piers,and asymmetric T-shaped,inverted L-shaped and portal piers and other non-standard piers can also be used when conditions are not permitted.At the same time,bridge type should be selected according to bridge span,plane curve radius and construction method.Monorail lines should be designed by comparing laying schemes of middle and side roads in terms of plane curve radius and construction method to reduce environmental impact.Not all straddle-type monorail lines are elevated,and some local underground lines may be employed necessarily adapting to terrain elevation difference to improve operation conditions,facilitate the connection of transport hubs and conform to the construction of comprehensive transportation system.