铁路全钢结构框架墩设计与施工关键技术  

Design and Key Construction Techniques of Railway All-Steel Portal-Frame Piers

作　　者：张晓明 ZHANG Xiaoming(Anhui-Jiangxi Railway Anhui Co.,Ltd.,Hefei 230001,China)

机构地区：[1]皖赣铁路安徽有限责任公司,安徽合肥230001

出　　处：《世界桥梁》2024年第1期39-44,共6页World Bridges

基　　金：中国铁路设计集团有限公司科技开发课题(2022A02036001)。

摘　　要：针对传统钢横梁-混凝土立柱框架墩邻近营业线时,混凝土立柱施工周期长、钢横梁吊装难度大的问题,提出钢横梁-钢立柱全钢结构框架墩方案。以宣绩高铁跨越既有皖赣铁路工程为背景,对全钢结构框架墩进行设计及应用研究。全钢结构框架墩立柱与横梁均为钢结构,提升了结构整体性;采用轻量化设计降低吊装难度和工程投资;通过柱底混合连接构造连接框架墩钢立柱和混凝土基础,提高了安装精度和连接可靠性。对结构稳定、局部承压、疲劳强度、刚度变形等各项指标进行验算,结果表明均满足规范要求。全钢结构框架墩采用旁位拼装、整体吊装、柱底对位连接的施工方案,施工阶段采用吊装变形控制和对位引导等施工关键技术,有效提高了施工工效和安装精度。对比传统钢横梁混凝土立柱框架墩,全钢结构框架墩工程投资相当,但减小了对既有铁路运营的干扰,施工难度和施工风险均大幅降低。When a portal-frame pier with a steel cap beam and concrete columns is near service railways,the construction of both the steel cap beam and concrete columns would be challenging due to the space limitations,as a result,the construction schedule would be relatively longer.To address this issue,an all-steel portal-frame pier with steel cap beam and columns is proposed,and the design and application of such type of piers are studied using the bridges of Xuancheng-Jixi High-speed Railway that crosses over the existing Anhui-Jiangxi Railway as cases.The utilization of steel cap beams and columns improves the structural integrity of the bridge,and the lightweight design also alleviates the installation challenges and costs of the project.The steel columns and the concrete footings can be connected via hybrid connections,to improve the installation accuracy and connection reliability.The parameters,including the stability of the structure,local compression,fatigue strength and stiffness deformation,were checked meeting the code requirements.The all-steel portal-frame piers were assembled off site,and integrally hoisted and connected with the concrete footings.During construction,the deformation of the components,positioning and guiding of end butt joint were controlled to enhance the construction efficiency and installation accuracy.Compared with the conventional portal-frame pier with steel cap beam and concrete columns,the all-steel portal-frame pier does not show significant cost reduction,but reduces the disturbance to the service railway as well as the construction challenges and risks.

关 键 词：跨线桥 全钢结构框架墩 钢横梁-钢立柱 轻量化设计 混合连接 柱底对位安装 整体吊装 营业线施工 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U449.52[交通运输工程—道路与铁道工程]