连续刚构桥边跨现浇段及合龙段一次性施工方法研究  

Research on One-Time Construction Method of Cast-in-Place Section and Merging Section of Side Span of Continuous Rigid-Frame Bridge

作　　者：伍海山[1] 刘凤帅 曹国军 Wu Haishan;Liu Fengshuai;Cao Guojun(School of CivilEngineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Jiangxi Machinery&Electric Equipment Tendering Co.,Ltd.,Nanchang 330046,China;The Fourth Construction Co.,Ltd of China Railway 23rd Bureau Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]江西省机电设备招标有限公司,江西南昌330046 [3]中铁二十三局集团第四工程有限公司,四川成都610031

出　　处：《华东交通大学学报》2023年第6期54-61,共8页Journal of East China Jiaotong University

摘　　要：以预应力混凝土连续刚构桥涪江大桥工程为背景,针对特殊环境下边跨直线段施工提出了挂篮一次性浇筑边跨直线段及合龙段的施工方法,利用理论推导及MIDAS CIVIL有限元软件对该施工方法进行分析,主要从主梁挠度、挂篮结构安全性以及桥梁结构受力等方面分析挂篮浇筑边跨直线段施工方法的可行性。研究表明:利用挂篮一次性浇筑边跨直线段及合龙段,对成桥后中跨侧主梁受力和挠度影响很小,而对成桥后边跨主梁竖向变形扰动较大,在施工中需及时调整主梁预拱度值。与传统施工方案相比,成桥后主梁最不利截面压应力增幅为15%,总体上处于可控范围内。从挂篮结构安全性方面考虑,挂篮结构在通过增设前后吊杆等优化方式后能满足施工过程中的安全要求。结果表明挂篮一次性浇筑边跨直线段及合龙段这一新的施工方法实践可行,并已在涪江大桥上顺利实施。With the background of the Fujiang Bridge project,which is a prestressed concrete continuous rigid-frame bridge,a construction method for one-time pouring of edge span linear section and closure section using a hanging basket is proposed for edge span linear section construction under complex terrain.The feasibility of the hanging basket method is analyzed using structural mechanics theory and MIDAS CIVIL finite element software,focusing on the main beam deflection,hanging basket structural safety,and internal forces of girder.The study shows that the one-time pouring of edge span linear section and closure section using a hanging basket has minor inpact on the mid-span side box girder internal forces and deflection after bridge completion,but has a certain influence on the vertical deformation of the edge span girder.Therefore,the pre-camber values of the box girder need to be adjusted timely during construction.Compared with traditional construction scheme,the maximum increase in the compressive stress on the worst section of the main beam after completion is 15%,which is within reasonable and controllable range.Considering the safety of the hanging basket,it can meet the safety requirements during construction by using optimization methods such as adding front and rear suspension rods.The results show that the one-time pouring of edge span linear section and closure section using a hanging basket is feasible,and this new construction method has been successfully applied in the construction of the Fujiang Bridge.

关 键 词：连续刚构桥 挂篮浇筑边跨直线段 桥梁施工监控 挂篮法 有限元法 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]