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| 施工条件受限的城市桥梁顶推施工技术研究
摘 要
城市桥梁的修建中，由于城市人口密集、交通复杂、管线众多，一些桥梁的施工建设环境极其复杂，施工作业空间和时间受到各种条件限制，导致一些常规的施工方法与工艺无法应用，施工难度极大。目前针对此类施工受限桥梁施工技术的研究很少。本文以上海市北横通道上跨铁路线和轨道交通线的新建拼宽桥梁顶推施工为背景，在其施工受限的情况下，对桥梁顶推施工技术进行研究，为城市桥梁建造提供借鉴，主要包括以下研究内容。
（1）结合工程实例分析了施工受限桥梁施工技术发展概况，并对桥梁顶推施工法在国内外的研究发展进行了概述。
（2）对本文所研究桥梁的施工受限因素进行了分析，针对其在施工过程中同时受到施工空间和施工时间的限制。结合桥梁施工受限情况，对其施工方法进行比选，确定了最优施工方法为步履式多点顶推施工法。
（3）结合桥梁施工受限情况对顶推施工临时结构和施工步骤进行了设计，对顶推施工重难点进行分析，针对其施工关键工况设计了最大悬臂试验和导梁上墩试验。
（4）采用MIDAS/Civil对桥梁顶推施工进行仿真分析，计算分析了桥梁结构预拱度和顶推支墩反力值，并对桥梁结构应力和变形进行验算，确定了桥梁在顶推施工过程中应力最大截面和变形最大位置。
（5）采用北斗位移监测设备和实时自动化监测平台对桥梁顶推施工进行全程监控，将关键工况的实测应力、位移数据与有限元分析理论数据对比，对其数据差异进行分析，确定桥梁各结构在顶推施工过程中的应力及线形的变化规律，对桥梁结构和施工方案提出优化建议。
关键词：桥梁施工技术，施工条件受限，顶推施工，步履式，仿真分析，自动化监测
Research on Construction Technology of Urban Road andBridge Push-up with Construction Restriction
ABSTRACT
In the construction of urban bridges, due to the dense urban population, complex traffic,and numerous pipelines, the construction environment of some bridges is extremely complicated, and the construction operation space and time are restricted by various conditions,resulting in some conventional construction methods and techniques that cannot be applied and the construction is difficult. great.At present, there are few researches on the construction technology of such construction-restricted bridges. This article takes the construction of the newly-built flat-width bridge over the railway line and the rail transit line on the North Cross Passage in Shanghai as the background. Under the limited construction,the construction technology of the bridge is studied to provide a reference for the construction of urban bridges. , Mainly includes the following research content.
(1) Analyze the development status of construction restricted bridge construction technology based on engineering examples,and summarize the research and development of bridge jacking construction method at home and abroad.
(2) Analyze the restricted factors of the bridges studied in this paper,aiming at the constraints of construction space and construction time during the construction process. Combined with the limited construction of the bridge,the construction methods were compared and selected,and the optimal construction method was determined to be the walking multi-point jacking construction method.
(3) The temporary structure and construction steps of the jacking construction were designed in combination with the restricted conditions of the bridge construction,the major and difficult points of the jacking construction were analyzed,and the maximum cantilever test and the guide beam upper pier test were designed for the key construction conditions.
(4) Using MIDAS/Civil to simulate and analyze the bridge's push-up construction,calculate and analyze the pre-camber of the bridge structure and push buttressreaction force value, check the stress and deformation of the bridge structure,and confirm that the bridge is in the push-up construction The maximum stress section and maximum deformation position during the process.
(5) The Beidou displacement monitoring equipment and real-time automated monitoringplatform are used to monitor the entire process of the bridge jacking construction. The measured stress and displacement data of key working conditions are compared with the theoretical data of finite element analysis,and the data differences are analyzedto determine the bridge The stress and linear changes of the structure during the jacking construction process, and the optimization suggestions for the bridge structure and construction plan are put forward.
KEY WORDS：bridge construction technology, limited construction conditions,jacking construction, walking type, simulation analysis, automated monitoring.
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