多拱面系杆拱桥顶推施工监控技术研究

Construction Monitoring Technology for Incremental Launching of Multi-Rib Tied-Arch Bridges

摘要: 多拱面系杆拱桥是为适应我国交通流量不断增大而衍生出来的一种新型复杂桥梁结构，实施全过程施工监控对于确保结构安全性与施工精度具有不可或缺的关键作用。本文以宜丰县工业园至火车站公路新建工程项目的跨武吉高速立交桥主跨三拱面钢箱系杆拱桥为背景，对多拱面系杆拱桥跨高速公路整体顶推过程的施工监控技术开展研究。采用Midas/Civil有限元软件对拱桥整体顶推施工全过程进行精细化模拟计算，基于计算分析结果提出相应施工监控方案，同时在顶推施工过程对拱桥各工况结构状态进行实时监测，对实测数据与理论数据之间的误差进行实时分析，不断调整修正实际施工过程，保障了拱桥在顶推施工全过程中关键构件的受力及变形均在规范允许范围之内，顺利完成顶推施工。

Abstract: The multi-rib tied-arch bridge is a novel and complex bridge structure developed to accommodate the continuously increasing traffic flow in China. Implementing full-process construction monitoring plays an indispensable and critical role in ensuring structural safety and construction accuracy. This paper takes the main span—a three-arch steel box tied-arch bridge of the overpass crossing the Wuji Expressway in the Yifeng County Industrial Park to Railway Station Highway New Construction Project—as the engineering background. It focuses on the construction monitoring technology for the integral incremental launching process of a multi-rib tied-arch bridge across an expressway. By employing the finite element software Midas/Civil, refined simulation and calculation of the entire incremental launching construction process of the arch bridge were conducted. Based on the computational analysis results, a corresponding construction monitoring plan was proposed. Meanwhile, real-time monitoring of the structural states under various working conditions was carried out during the incremental launching process. The discrepancies between the measured data and theoretical data were analyzed in real-time, allowing for continuous adjustment and correction of the actual construction process. This ensured that the internal forces and deformations of key components remained within the allowable limits specified by the relevant codes throughout the entire incremental launching, leading to the successful completion of the launching construction.