超静定桥梁桩基主动托换中的顶升力控制方法
牛斌
Lifting Force Control Method in Active Underpinning of Statically Indeterminate Bridge Pile Foundation
NIU Bin
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作者信息:北京城建设计发展集团股份有限公司， 100037， 北京
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Affiliation:Beijing Urban Construction Design & Development Group Co., Ltd., 100037, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.08.046
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中图分类号/CLCN:U443.16+3
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栏目/Col:应用技术
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。
Abstracts:
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.
引文 / Ref:
牛斌.超静定桥梁桩基主动托换中的顶升力控制方法[J].城市轨道交通研究，2021，24(8):218.
NIU Bin.Lifting force control method in active underpinning of statically indeterminate bridge pile foundation[J].Urban Mass Transit，2021，24(8)：218.
NIU Bin.Lifting force control method in active underpinning of statically indeterminate bridge pile foundation[J].Urban Mass Transit，2021，24(8)：218.
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