铁路客运专线特大桥主桥方案的技术比选  

Comparison of Technical Schemes for the Main Bridge of a Super-large Viaduct for Passenger Transportation

作　　者：刘轶宇 LIU Yiyu

机构地区：[1]湖北铁路集团紫云(当远)有限责任公司,湖北武汉430077

出　　处：《重庆建筑》2024年第6期65-68,共4页Chongqing Architecture

摘　　要：铁路客运专线特大桥在两山之间河道垭口处跨越江河,在较短河道范围内与已建成桥梁共同形成5座桥梁并行的桥梁群。受地形限制,水流速度大,受桥墩位置影响,河道水流及河床地形发生复杂变化。该文对比研究了该铁路客运专线3种不同的桥位方案,然后分析了河床演变并预测了其演变趋势,最后分析了3座不同类型的大跨度铁路桥梁的主梁结构和技术特点。结果表明:(1)并行两公路桥方案线形条件较好,对通航影响和铁路影响均较小;(2)桥区河段河道河床总体基本稳定,桥梁建设不会导致河段发生较大的演变;(3)预应力混凝土连续梁桥设计的关键是合理控制工后徐变;部分斜拉桥整体刚度大、经济效益好;高低塔混合梁斜拉桥受力体系明确、结构美观、刚度条件好。The super-large viaduct for passenger transportation spans river valleys between mountains,forming a bridge group with the other four parallel bridges built within a short river span.Due to terrain constraints and high water flow velocities,the river flow and bed morphology undergo complex changes influenced by pier positions.This paper compares and studies three different bridge alignment schemes for this viaduct.It analyzes the evolution of the riverbed and predicts its trends,and finally examines the main beam structures and technical characteristics of three different types of large-span railway bridges.The results indicate:(1)The scheme aligning with two parallel highway bridges offers favorable geometric conditions with minimal impacts on navigation and railway operations.(2)The overall stability of the riverbed in the bridge area suggests that bridge construction will not cause significant changes in the river section.(3)Key considerations for prestressed concrete continuous beam bridge design include effective control over post-construction creep;cable--stayed bridges offer high overall stiffness and good economic benefits;and hybrid girder cable-stayed bridges provide clear load-bearing systems,aesthetic structures,and favorable stiffness conditions.

关 键 词：铁路 桥位方案 河床演变 桥式方案 

分 类 号：U442.54[建筑科学—桥梁与隧道工程]