考虑桥墩实测刚度的墩梁固结桥梁合龙顶推力调整简化算法  

Simplified calculation method of adjusting jacking force for the closure of pier-girder rigid bridges considering actual measured stiffness of piers

作　　者：渠述锋 孟栋梁 杨孟刚[2] QU Shufeng;MENG Dongliang;YANG Menggang(Jinan-Qingdao High Speed Railway Co.,Ltd.,Jinan 250014,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]济青高速铁路有限公司,山东济南250014 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2020年第11期2864-2872,共9页Journal of Railway Science and Engineering

基　　金：山东省交通运输厅科技计划资助项目(2020B79)。

摘　　要：当墩梁固结桥梁存在合龙温差时,为使桥梁结构的成桥状态接近于设计基准状态,需要对合龙顶推力进行调整,且当地质状况复杂时,有限元软件难以对桩-土相互作用进行精确的模拟,因此有必要考虑顶推过程中桥墩实测抗推刚度的影响。以某塔墩梁固结矮塔斜拉桥为工程背景,提出一种根据合龙温差和桥墩实测抗推刚度,在顶推过程中调整合龙顶推力的简化计算方法。研究结果表明:合龙温差会使实际成桥状态偏离设计基准状态,该偏差在顶推前可以通过对合龙顶推力进行调整来抵消;桥墩实测抗推刚度会对合龙顶推力的调整产生一定的影响,需在顶推过程中根据实测值进一步调整合龙顶推力来消除;提出的简化算法可方便快速应用于同类型桥梁顶推过程中合龙顶推力的精确调控。To make pier-girder-consolidated bridges close to the design finished state,the jacking force needs to be adjusted when there is a closure temperature difference.Moreover,the finite element method is difficult to simulate the soil-pile interaction accurately due to the complex geological conditions.Therefore,it is necessary to consider the actual measured anti-pushing stiffness of piers in the process of pushing.Taking an extradosed cable-stayed bridge as the engineering background,a simplified calculation method is proposed to adjust the jacking force according to the closure temperature difference and the actual measured anti-pushing rigidity of the piers.The results indicate that the closure temperature difference will cause the actual finished state to deviate from the designed finished state,which can be counteracted by adjusting the jacking force.The actual measured anti-pushing stiffness of piers can influence the adjustment of closure jacking force,and it needs to be further adjusted according to the actual measured values during the process of pushing.The proposed simplified method can be quickly and conveniently applied to the precise control of the jacking force of the same type of bridge during the process of pushing.

关 键 词：墩梁固结桥梁 合龙温差 桥墩实测抗推刚度 顶推力调整 简化算法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.466[交通运输工程—道路与铁道工程]