大跨度钢管混凝土拱桥扣塔高度影响效果分析  

Analysis on the Influence of Buckle Tower Height on Long-span Steel Tube Concrete Arch Bridges

作　　者：李佳奇 彭志辉 许慧远 彭成明[1,2] LI Jia-qi;PENG Zhi-hui;XU Hui-yuan;PENG Cheng-ming(CCCC Second Harbor Engineering Co.Ltd.,Wuhan 430040,China;CCCC Highway Bridges National Engineering Research Centre Co.Ltd.,Beijing 100088,China;Research and Development Center of Intelligent Manufacturing Technology for Transportation Infrastructure in Transportation Industy,Wuhan 430040,China)

机构地区：[1]中交第二航务工程局有限公司,武汉市430040 [2]中交公路长大桥建设国家工程研究中心有限公司,北京市100088 [3]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

出　　处：《公路》2025年第4期116-123,共8页Highway

基　　金：中交集团科技研发项目,项目编号2019-ZJKJ-27。

摘　　要：某大跨度钢管混凝土拱桥主跨为500 m,矢高为105 m,采用“缆索吊装+斜拉扣挂”总体施工工艺。设计指导方案中扣塔高度为60 m,较高的扣塔高度会影响缆塔等临时结构设计,增大高空作业安全风险,增加施工成本。为探究大跨度钢管混凝土拱桥合理扣塔高度,采用影响矩阵法对15~75 m范围内5种不同高度的扣塔进行扣索初拉力求解,建立了5种不同扣塔高度的拱肋施工有限元模型,对各模型扣索力、拱肋施工阶段变形、松索后应力和扣索、缆塔、扣塔材料用量进行了对比分析,推导了扣塔高度与临时结构材料用量之间的关系式。结果表明,与较大(75 m)的扣塔高度相比,低扣塔(15 m)模型单束扣索最大索力值增加2 409 kN,施工过程中最大挠度、纵桥向位移差值分别增加120.9 mm、35.6 mm,松索后上弦钢管最大应力减小7MPa,下弦钢管最大应力增大10.5MPa;全桥扣索用量增加49 t,缆塔和扣塔用量减少约3 096 t,在75~15 m扣塔高度范围内,缆塔及扣塔钢材用量的减少量远大于扣索材料用量增量。大跨度钢管混凝土拱桥拱肋施工时,一定范围内的扣塔高度均可满足拱肋成拱线形要求,较低的扣塔高度对斜拉扣挂系统结构和拱肋成拱后应力影响很小,有利于降低高空作业安全风险、缩短施工工期、减少施工成本。本研究成果可为今后类似工程建设的扣塔高度设计提供参考。A large-span steel-concrete arch bridge with a main span of 500 meters and a rise height of 105 meters adopts the overall construction process of"cable hoisting+diagonal tension buckle hanging".The height of the buckle tower in the design guidance plan is 60 meters.The higher buckle tower height affects the design of temporary structures such as cable towers,increases the safety risk of working at height and construction costs.In order to explore the reasonable height of buckle towers for large-span steel-concrete arch bridges,in the paper,the influence matrix method is used to solve the initial tension of buckle towers for 5 different heights within the range of 75~15 meters.Finite element models for arch rib construction with 5 different buckle tower heights are established.The buckling force of each model,deformation during the construction stage of the arch rib,stress after loosening the cable,and the quantities of materials used for buckling cables,cable towers,and buckle towers are compared and analyzed.The formulas for buckle tower height and temporary structural material usage are derived.The results show that compared to a higher(75 m)tower height,the maximum cable force of a single bundle of cables in the low tower(15 m)model increases by 2409 kN.During the construction process,the maximum deflection and longitudinal displacement difference of the bridge increased by 120.9 mm and 35.6 mm respectively.After loosening the cable,the maximum stress of the upper chord steel pipe decreases by 7 MPa,and the maximum stress of the lower chord stel pipe increases by 10.5 MPa.The total quantities of cable ties for the entire bridge are increased by 49 tons,and that of buckle towers and cable towers are decreased by about 3096 tons.Within the height range of 75~15 meters of buckle towers,the decrease in steel usage for buckle towers and cable towers is much greater than the increase in cable tie material consumption.When constructing the arch ribs of a large-span steel-concrete arch bridge,the height of the buckle

关 键 词：桥梁工程 钢管混凝土拱桥 斜拉扣挂 扣塔高度 施工过程 参数分析 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]