钢管混凝土系杆拱桥改造技术

Reconstruction Techniques of Concrete Filled Steel Tube Bowstring Arch Bridge

摘要:

以武汉市长丰桥提升改造工程为背景，介绍了桥梁的病害，同时对病害产生的原因进行针对性分析，并在此基础上详细阐述了钢管混凝土系杆拱桥改造提升的总体思路及实施方案。在利用原有主拱圈的基础上，通过建立整体性钢桥面板解决了原有桥面主梁为悬挂漂浮体系的安全隐患，并对达到设计使用年限的吊杆、系杆等病害构件进行更换及修缮，同时通过减轻桥面恒载进一步提高了桥梁通行荷载能力。项目的实施消除了桥梁结构安全隐患，提高了结构的安全储备及耐久性。有限元计算分析表明，桥梁结构在施工阶段及成桥后的受力均满足规范要求，分析成果已用于指导工程的实施。该工程的改造提升方案可为同类结构的维修改造提供参考。

Abstract:

Based on the upgrading and reconstruction project of Changfeng Bridge in Wuhan, the disease phenomenon of the bridge is introduced, and the causes of the disease are specially analyzed. And on this basis, the overall idea and the implementation scheme of the upgrading and reconstruction of concrete filled steel tube bowstring arch bridge are expounded in detail. In the reconstruction scheme on the basis of using the original main arch ring, the integral steel bridge deck is built to solve the safety hazard of the original bridge deck girder as the suspended floating system, and the disease components of boom and tie bar over the design service life are replaced and repaired. At the same time by reducing the bridge deck constant load, the bridge traffic load capacity is further improved. The implementation of the project eliminates the hidden safety danger of bridge structure and improves the safety reserve and durability of the structure. The finite element calculation and analysis of the reconstruction scheme show that the force of the bridge structure in the construction stage and after the bridge construction meets the specification requirements, and the analysis results have been used to guide the implementation of the project. At the same time, the reconstruction and upgrading scheme of this project can provide a reference for the maintenance and reconstruction of similar structures.