大跨度不对称连续梁设计与施工关键技术  

Key Techniques for Design and Construction of Long⁃span Asymmetric Continuous Girder

作　　者：翁方文[1,2] 吴成[3] 鲁祖泽 WENG Fangwen;WU Cheng;LU Zuze(CCC Second Harbor Engineering Co.Ltd.,Wuhan 430040,China;Key Laboratory of Large-span Bridge Construction Technology in Transport Field,Wuhan 430040,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China;Jiafeng Engineering Co.Ltd.Hubei Branch,Wuhan 430050,China)

机构地区：[1]中交第二航务工程局有限公司,武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,武汉430040 [3]中铁第四勘察设计院集团有限公司,武汉430063 [4]佳风工程有限公司湖北分公司,武汉430050

出　　处：《铁道建筑》2021年第12期28-30,39,共4页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(K2018G017)。

摘　　要：以泉州湾跨海大桥跨径组合为(62.7+110.0+45.7)m的连续梁为实例,建立有限元模型对大跨度不对称连续梁进行受力分析。通过对小边跨梁内分阶段实施永久压重,确保施工及运营全过程结构受力安全,实现不对称连续梁边跨和中跨对称悬臂浇筑施工。分析结果表明:有限元模型中主梁施工阶段最大压应力为9.51 MPa,最大拉应力为0.91 MPa;运营阶段结构强度安全系数及抗裂安全系数均满足要求。在小边跨压重荷载不变的前提下进行施工组织优化,采用箱内现浇混凝土+预制铁砂混凝土结合的形式调节压重荷载,确保安全施工,提高了施工效率。Taking Quanzhou Bay sea crossing bridge as an example,which is a continuous girder with a span of(62.7+110.0+45.7)m,a finite element model was established to analyze the stress of long-span asymmetric continuous girder.The permanent weight load was applied to the small side span girder in stages to ensure the structural stress safety in the whole process of construction and operation,and realize the symmetrical cantilever casting construction of asymmetric continuous girder side span and middle span.The results show that in the finite element model,the maximum compressive stress is 9.51 MPa and the maximum tensile stress is 0.91 MPa.In the operation stage,the structural strength safety factor and crack resistance safety factor meet the requirements.The construction organization is optimized on the premise that the weight load of small side span remains unchanged,and the combination of box cast-in-situ concrete+prefabricated iron-sand concrete is adopted to adjust the weight load and to ensure safe construction and improve construction efficiency.

关 键 词：铁路桥梁 悬浇 不对称 不平衡弯矩 设计及施工 压重 施工组织 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]