喀斯特地区跨座式单轨轨道梁桥总体设计  

Overall design of straddle-type monorail beam viaduct in karst areas

作　　者：周佳 Zhou Jia

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《现代城市轨道交通》2023年第6期21-26,共6页Modern Urban Transit

摘　　要：以规划桂林市轨道交通1号线一期工程为例,系统介绍喀斯特地区跨座式单轨轨道梁桥的设计要点,并结合桂林市独特的喀斯特地貌,选择适合的标准轨道梁结构体系、桥墩类型、基础类型以及特殊节点的轨道梁桥设计方案,提出标准区间采用简支PC轨道梁结构体系、T型桥墩、4根1m桩基础,特殊节点采用简支钢-混凝土结合轨道梁及(50+85+50)m混凝土连续梁单轨桥。其中,简支PC轨道梁结构体系适应岩溶地质的能力强;4根1m桩基础施工便捷,较1根2.5m桩基础节省造价17.3%,桥墩刚度提高8%;简支钢-混凝土结合轨道梁、混凝土连续梁单轨桥可有效解决简支PC轨道梁跨越能力不足的问题。期待本研究可为同类型跨座式单轨轨道梁桥的设计提供思路。This paper systematically introduces the design essentials of urban straddle-type monorail beam viaduct in karst areas based on the planning of Guilin rail transit line 1 phase 1 project.It combines Guilin's unique karst landform and selects the standard beam structural system,pier type,foundation design,and the design scheme of the beam viaduct with special nodes suitable for urban characteristics.The paper proposes the standard simply supported PC beam structural system for standard sections,standard simply supported beam with T-shaped pier,four 1m pile foundations,steel concrete composite beam,and(50+85+50)m monorail composite viaduct for special nodes.The simply supported PC beam structural system has strong adaptability to karst geology and allows for convenient construction of four 1m piles.Compared with using one 2.5m pile,it saves costs by 17.3%and increases the pier stiffness by 8%.The simply supported steel-concrete composite beam and continuous beam monorail viaduct effectively solve the problem of insuffi cient capacity of PC beams to span urban roads and railways and hope this study can provide a new idea for the design of straddle-type monorail beam viaducts.

关 键 词：跨座式单轨 轨道梁桥 喀斯特地区 结构体系 桂林市 

分 类 号：U213.14[交通运输工程—道路与铁道工程] U232