双曲拱桥主拱圈外包混凝土加固施工技术

以南渡大桥双曲拱桥加固工程为背景,分析了主要影响主拱圈承载力降低的病害(包括混凝土碳化、钢筋锈胀、混凝土缺陷等)及成因,为实现提高原主拱圈承载力适应现行交通通行需要,采用主拱圈外包混凝土增大截面加固技术,并详细介绍了其加固技术的工作原理、主要施工工艺等,为同类工程设计和施工提供参考。

Construction technology of concrete reinforcement for the main arch ring of double-curvature arch bridge

Based on the reinforcement project of Nandu Bridge, the paper analyzes the main diseases (including concrete carbonization, steel rust expansion, concrete defects, etc.) affecting the reduction of the bearing capacity of the main arch circle and their causes. In order to improve the bearing capacity of the original main arch circle to meet the current traffic needs, the strengthening technology of the main arch circle is adopted to increase the cross-section of the main arch circle To provide reference for similar engineering design and construction.