超静定桥梁桩基主动托换中的顶升力控制方法  

Lifting Force Control Method in Active Underpinning of Statically Indeterminate Bridge Pile Foundation

作　　者：牛斌 NIU Bin(Beijing Urban Construction Design&Development Group Co.,Ltd.,100037,Beijing,China)

机构地区：[1]北京城建设计发展集团股份有限公司,北京100037

出　　处：《城市轨道交通研究》2021年第8期218-222,共5页Urban Mass Transit

摘　　要：介绍了盾构下穿超静定结构桥梁时的主动托换技术方案。详细阐述了主动托换中的顶升力控制方法,针对具体项目,说明了预支顶范围和顶升力的测定方法,并着重论述了顶升力的确定。顶升力测定结果表明:超静定结构桥梁在长期使用过程中,桥面板传至各桥墩位置的力与理论计算值局部误差达30%以上;基于实测顶升力来控制对桥梁桩基的主动托换,可避免理论计算产生的误差,防止托换过程中短暂的内力重分布导致的裂缝和变形的发生。实际项目的监测结果验证了顶升力控制方法的有效性和合理性。The active underpinning technical scheme of shield tunnel under-passing statically indeterminate bridge structure is introduced.The lifting force control method during active underpinning is expounded.In terms of specific projects,the measure methods of pre-supporting range and lifting force are explained,especially emphasizing on the confirmation of lifting force.Lifting force measuring results show that in the long-term use of statically indeterminate structural bridge,the force transmitted from the bridge deck to each pier is inconsistent with the theoretical calculation value,and the local error is more than 30%,while controlling active underpinning of the bridge with field test lifting force can avoid theoretical error,preventing the occurrence of cracks and deformation on bridge caused by short-term internal force redistribution during the replacement process.Monitoring results from practical projects has verified the feasibility and rationality of the lifting force control method.

关 键 词：超静定桥梁桩基 主动托换 顶升力 变形控制 

分 类 号：U443.163[建筑科学—桥梁与隧道工程]