由于城市规模急剧扩大，造成城市交通日益拥堵，现有的部分市政桥梁工程已经无法满足现有交通的需求，急需进行功能性加固改造。如何采用合理的理论和技术完成复杂条件下城市既有桥梁改造工作是桥梁工程中的重要工程问题之一，开展复杂环境下城市主干道既有连续梁桥顶升工程关键技术研究具有重要的工程应用价值。本文以西安市南二环高新~丰庆段桥梁顶升施工项目为依托，开展复杂环境下城市主干道既有桥梁顶升工程关键技术研究。主要工作和结论是：

（1）对复杂条件下城市既有混凝土连续梁桥顶升基本力学原理、关键技术、常用施工方法及其施工安全的主要影响因素等进行了分析研究。结果表明，桥梁顶升工程安全施工的主要影响因素包括桥梁裂纹的扩展程度、箱梁的徐变作用、顶升设备的质量、顶升施工人员的操作水平、既有桥梁的结构特性和强度。

（2）制定了南二环高新~丰庆段桥梁顶升施工项目各阶段施工的施工步骤及组织形式，完成了基于BIM技术的顶升施工过程建模分析工作。制定了既有桥梁顶升施工技术的总体方案；计算并验算了桥梁顶升工程中各分部分项工程的稳定性与安全性。

（3）编制了南二环高新~丰庆段桥梁顶升施工项目顶升施工全过程监测方案并进行了实时监测工作。分析了桥梁顶升施工过程中桥梁结构横纵向位移及变形、各墩梁体的横纵向偏移、各监测点梁体沉降以及钢管临时支撑变形的监测数据变化规律。

（4）工程实践表明，在既有混凝土连续桥梁顶升施工过程中，桥梁结构的稳定性较好，施工安全性得到保证。该工程已经安全运行多年，证明了文中提出的既有混凝土连续桥梁同步顶升关键技术切实可行。

Due to the rapid expansion of urban scale, urban traffic is becoming increasingly congested. Some existing municipal bridge projects have been unable to meet the needs of existing traffic, and functional reinforcement and transformation are urgently needed. How to use reasonable theory and technology to complete the reconstruction of existing urban bridges under complex conditions is one of the important engineering problems in bridge engineering. It is of great engineering application value to carry out the key technology research on the jacking project of existing continuous girder bridges on urban main roads under complex environment. Based on the bridge jacking construction project of the Gaoxin~Fengqing section of the South Second Ring Road in Xi 'an, this paper studies the key technologies of the existing bridge jacking project of the urban main road in a complex environment. The main work and conclusions are as follows：

(1) The basic mechanical principles, key technologies, commonly used construction methods, and main influencing factors on construction safety of existing concrete continuous beam bridges in urban areas under complex conditions were analyzed and studied. The results indicate that the main influencing factors for the safe construction of bridge jacking engineering include the degree of crack propagation, the creep effect of box beams, the quality of jacking equipment, the operational level of jacking construction personnel, and the structural characteristics and strength of existing bridges.

(2) The construction steps and organization forms of each stage of the bridge jacking construction project in the South Second Ring Gaoxin-Fengqing section were formulated, and the modeling and analysis of the jacking construction process based on BIM technology was completed. The overall scheme of existing bridge jacking construction technology is formulated. The stability and safety of each part of the bridge jacking project are calculated and checked.

(3) The whole process monitoring scheme of the jacking construction project of the South Second Ring Gaoxin-Fengqing section bridge jacking construction project is compiled and the real-time monitoring work is carried out. The monitoring data of the horizontal and vertical displacement and deformation of the bridge structure, the horizontal and vertical offset of each pier beam body, the settlement of each monitoring point beam body and the deformation of the temporary support of the steel pipe during the construction of the bridge are analyzed.

(4) The engineering practice shows that in the jacking construction process of the existing concrete continuous bridge, the stability and better construction safety of the bridge structure are guaranteed. The project has been safely operated for many years, which proves that the key technology of synchronous jacking of existing concrete continuous bridges is feasible.

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