瓯江北口大桥南引桥上层节段梁施工方案优化分析  

Optimization Analysis of Construction Schemes for Upper Segment Beam of South Approach Bridge of Oujiang North Estuary Bridge

作　　者：王敏[1,2] 肖林 郑和晖[1,4] 夏崟濠 WANG Min;XIAO Lin;ZHENG Hehui;XIA Yinhao(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei 430014,China;Key Laboratory for Construction Technology of Long Span Bridges,Ministry of Transport,Wuhan,Hubei 430014,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan,Hubei 430014,China;CCCC Highway Bridge National Engineering Research Center Co.,Ltd.,Wuhan,Hubei 430014,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430014 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430014 [3]交通运输行业交通基础设施智能建造技术研发中心,湖北武汉430014 [4]中交公路长大桥建设国家工程研究中心有限公司,湖北武汉430014

出　　处：《施工技术（中英文）》2022年第5期66-69,74,共5页Construction Technology

摘　　要：瓯江北口大桥南引桥上层节段梁原施工方案采用先简支后连续的工艺,为降低主梁及架桥机安全风险,调整施工方案,并对主梁及墩顶块的预应力体系和结构进行优化与计算分析。结果表明,主梁体内束在墩顶块内部布置成交叉锚固的形式,可满足逐跨连续的工艺需求。通过在墩顶块上层新增横向预应力束、下层预应力束锚点下移、减小人孔尺寸等具体措施,可使墩顶块在最不利工况下受力安全。The original construction scheme, of the upper-segment beam of the south bridge access of Oujiang North Estuary Bridge, adopts the technology of simple support before continuous support. In order to reduce the safety risk of main girder and bridge erecting machine, the construction scheme was adjusted and the pre-stressed system and structure of main beam and pier top block were optimized through calculation and analysis. Results show that the requirement of span by span continuous process can be met if pre-stressed tendons in the main girder are arranged in the form of cross anchorage in pier top block. And the stress safety of the pier top block can be ensured even under the most unfavorable working conditions by taking concrete measures such as adding transverse pre-stressed tendons in the upper-layer of pier top block, moving down the anchor points of the lower pre-stressed tendons, and reducing the size of the manhole, etc.

关 键 词：桥梁工程 节段梁 隐横梁 施工方案 交叉锚固 优化分析 

分 类 号：U445.4[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]