大跨度矮塔斜拉桥建造关键控制因素研究  

Research on Key Control Factors in the Construction of Large Span Extradosed Cable-stayed Bridge

作　　者：陈杰[1] 宋飞 王法武[1] CHEN Jie;SONG Fei;WANG Fawu(China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China;China Railway Shanghai Bureau Group Co.,Ltd.,Shanghai 200071,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070 [2]中国铁路上海局集团有限公司,上海200071

出　　处：《铁路工程技术与经济》2024年第5期53-57,共5页Railway Engineering Technology and Economy

基　　金：中铁上海设计院集团有限公司科技研究开发计划课题(集23-Z04)。

摘　　要：新建淮北至宿州至蚌埠高铁淮河特大桥采用(124+248+124)m矮塔斜拉桥跨越淮河。本文介绍了工程概况,施工方案,通过建立有限元计算模型,主要从斜拉索第一次张拉力比值及二次张拉时序、预应力施工对徐变的影响、刚构体系对顶力、合龙温度对刚构墩受力影响等施工关键控制因素进行了分析。结果表明斜拉索第一次张拉力比值,二次张拉时序、跨中底板束及顶板束预应力施工对控制工后徐变影响明显,塔梁墩固结体系梁体合龙前施工对顶力、合龙温度对刚构墩受力影响较大,施工过程应严格控制这些关键因素以提高成桥质量。The newly-built Huaihe River Super-majior Bridge of the Huaibei Suzhou Bengbu high-speed railway will use a(124+248+124)m Extradosed Cable-stayed Bridge to cross the Huaihe River.This article introduces the engineering overview and construction plan.By establishing a finite element calculation model,the main construction key control factors are analyzed,including the first tension ratio and second tension sequence of the cable-stayed cable,the influence of prestressed construction on creep,the top thrust of the rigid structure system,and the influence of closure temperature on the stress of the rigid structure pier.The results show that the first tension ratio of the cable-stayed cable,the second tension sequence,the prestressed construction of the mid span bottom plate bundle and the top plate bundle have a significant impact on controlling post construction creep.The construction of the tower beam pier consolidation system before the beam closure has a significant impact on the thrust and closure temperature on the stress of the rigid structure pier.The construction process should strictly control these key factors to improve the quality of the bridge.

关 键 词：高速铁路桥梁 大跨度 矮塔斜拉桥 施工控制 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]