TY复合墩施工期受力特性及抗裂方案研究  

Research on the Force Characteristics and Anti-cracking Scheme of TY Composite Pier during Construction Period

作　　者：陈清河 李刚 徐德志 郑和晖[2,3,4] CHEN Qing-he;LI Gang;XU De-zhi;ZHENG He-hui(Huangmaohai Sea-crossing Channel Management Center,Zhuhai 519000,China;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430040,China;Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040,China;Guangdong Communication Planning&Design Institute Group Co.Ltd.,Guangzhou 510507,China)

机构地区：[1]黄茅海跨海通道管理中心,珠海市519000 [2]中交第二航务工程局有限公司,武汉市430040 [3]长大桥梁建设施工技术交通行业重点实验室,武汉市430040 [4]交通运输行业交通基础设施智能制造技术研发中心,武汉市430040 [5]广东省交通规划设计研究院股份有限公司,广州市510507

出　　处：《公路》2024年第8期204-210,共7页Highway

基　　金：国家重点研发计划项目,项目编号2022YFC3802003。

摘　　要：黄茅海通道中引桥采用TY复合墩+分体式钢箱梁结构,复合墩采用翻模法+托架法施工,钢箱梁通过浮吊分幅架设。采用有限元法对结构复杂且偏心受压的TY复合墩进行施工全过程受力分析,结果表明,复合墩施工过程面临较大开裂风险,盖梁浇筑时V腿根部、预应力张拉时盖梁外侧底缘局部及钢箱梁分幅架设时墩身的开裂风险大。基于复合墩施工期抗裂方案研究,采用增设预应力解决V腿根部开裂问题,并通过优化预应力方案解决盖梁开裂问题;提出横向移梁、增设配重、增加竖向预应力这3种墩身抗裂方案,并开展可行性及相对最优解分析,通过技术性及经济比选推荐采用增设竖向预应力方案。现场应用结果表明,上述各项措施能有效降低复合墩施工期的开裂风险。The approach bridges of the Huangmaohai Sea-crossing Channel adopts TY composite pier plus split steel box girder structure,the composite piers are built by overturning mold method plus bracket method,and steel box girder is erected by floating crane in different widths.The finite element method is used to analyze the whole construction process of TY composite pier which is structurally complex and eccentrically pressurized,and the results show that:the composite pier faces large cracking risk in the construction process,and there is a large risk of cracking of the pier body during the casting of cover beams at the root of V-legs,the local bottom edge of the outer side of cover beams during prestressing tensioning,and the erection of the steel box girder in separate widths.Based on the studies of anti-cracking schemes during the construction period of composite pier,additional prestressing is used to solve the cracking problem of V-leg root;the prestressing scheme is optimized to solve the cracking problem of cover girder;three kinds of anti-cracking schemes for the pier shaft are proposed,which are transverse shifting of girder,installation of additional counterweights and increase of vertical prestressing,and the analysis of feasibility and relative optimal solution is carried out,and the installation of vertical prestressing is recommended to be adopted after comparisons in terms of technical and economic aspects.Field application results show that the above measures can effectively reduce the risk of cracking during the construction of composite piers.

关 键 词：桥梁工程 TY复合墩 V腿抗裂 预应力优化 横向移梁 增设配重 竖向预应力 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]