摘要
为减小对通航的影响,余姚江特大桥钢桁梁采用河道中不设临时墩的顶推法施工,但当处于最大悬臂状态时,下部结构将会受到较大偏心荷载作用。为了研究余姚江特大桥钢桁梁顶推施工过程中下部结构受力情况,建立该桥下部结构的有限元模型,从减小偏心距离和偏心力两个方向考虑,经方案比选,确定了一种采用双滑块优化受力的顶推方案。验算结果表明,该方案有效地改善了下部结构的受力情况,减小了主墩及基础所受的偏心弯矩,桩基拉力最大为811.2 kN,满足规范要求。滑道梁等临时结构的强度、刚度也均满足规范要求。
In order to reduce the impact on navigation,the steel truss girder of Yuyao River Bridge is constructed by incremental launching method without temporary piers in the river.However,when it is in the maximum cantilever state,the substructure will be subjected to large eccentric load.In order to study the stress of the substructure during the jacking construction of the steel truss girder of Yuyao River Bridge,established the finite element model of the substructure of the bridge.Considering the two directions of reducing the eccentric distance and the eccentric force,through the comparison and selection of the schemes,a jacking scheme with double sliders to optimize the stress was determined.The calculation results show that the scheme effectively improves the stress of the substructure and reduces the eccentric bending moment of the main pier and foundation.The maximum tension of the pile foundation is 811.2 kN,which meets the requirements of the specification.The strength and stiffness of temporary structures such as slipway beams also meet the requirements of the code.
作者
邓海涛
周继亮
魏涛涛
DENG Haitao;ZHOU Jiliang;WEI Taotao(China Railway No.2 Engineering Group Co.,Ltd.,Chengdu,Sichuan 610031,China;NJTech Bridge&Tunnel and Rail Transit Institute,Nanjing,Jiangsu 210031,China)
出处
《黑龙江交通科技》
2024年第5期92-97,共6页
Communications Science and Technology Heilongjiang
关键词
钢桁梁桥
顶推施工
双滑块
下部结构
方案优化
steel truss girder bridge
incremental launching construction
double slider
substructure
scheme optimization
