悬臂施工的连续箱梁桥框架墩横梁监控技术的研究  

Study on Monitoring Technology for Frame Pier Crossbeam of Continuous Box Beam Bridge During Cantilever Construction

作　　者：老国健 刘方刚 李新平[2] 赵小龙 LAO Guojian;LIU Fanggang;LI Xinping;ZHAO Xiaolong(Guangzhou Expressway Co.,Ltd.,Guangzhou,Guangdong 510000,china;South China University of Technology,Guangzhou,Guangdong 510641,china)

机构地区：[1]广州市高速公路有限公司,广东广州510000 [2]华南理工大学,广东广州510641

出　　处：《公路工程》2024年第4期35-41,共7页Highway Engineering

基　　金：广东省基础与应用基础研究基金项目(2021A1515012405)。

摘　　要：大跨径框架墩连续箱梁桥施工过程中可能存在不平衡荷载使框架墩横梁受扭,为了消除框架墩的受扭一般采用配重方式进行施工监控。以广佛肇高速公路上的一座主墩采用墩梁固结的框架墩大跨径连续箱梁桥为工程背景,采用结构力学方法推导出框架墩横梁端部截面倾斜角随不平衡弯矩变化的理论计算式和框架墩立柱水平变位与不平衡弯矩关系的计算公式,同时给出了与水箱配重相关的计算公式,并提出了对框架墩横梁监控的两种监控方法。理论计算公式通过在实际工程的应用,对比了该桥梁的框架墩横梁施工监控中采用有限元数值分析计算获得的数值拟合公式,两者公式中的常系数基本相等,验证了提出的框架墩横梁受扭监控计算理论公式的正确性。并对采用监测横断端部倾斜角的监控方法与采用监测立柱水平变位的监控方法进行了对比分析。研究成果可为同类工程的施工监控提供帮助。During the construction process of a large-span frame pier continuous box girder bridge,there may be unbalanced loads that cause the beam of the frame pier to be twisted.In order to eliminate the torsion of the frame pier,a counterweight method is generally used for construction monitoring.This article takes a frame pier large-span continuous box girder bridge on the Guangfozhao Expressway,which uses pier beam consolidation as the engineering background.Using structural mechanics methods,the theoretical calculation formula for the inclination angle of the end section of the frame pier beam changes with the unbalanced bending moment,and the calculation formula for the relationship between the horizontal displacement of the frame pier column and the unbalanced bending moment are derived.At the same time,the corresponding calculation formula for the weight relationship with the water tank is provided,and two monitoring methods were proposed for monitoring the frame pier crossbeam.The theoretical calculation formula in this article is compared with the numerical fitting formula obtained through finite element numerical analysis in the construction monitoring of the frame pier crossbeam of the bridge through practical engineering applications.The constant coefficients in the two formulas are basically equal,verifying the correctness of the proposed theoretical formula for monitoring the torsion of the frame pier crossbeam in this article.And a comparative analysis was conducted between the monitoring method of monitoring the inclination angle of the transverse end and the monitoring method of monitoring the horizontal displacement of the column.The research results of this article can provide assistance for construction monitoring of similar projects.

关 键 词：桥梁工程 预应力混凝土箱梁 框架墩横梁 施工监控 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]