双曲拱桥病害分析与加固方法研究

分析了双曲拱桥的现状 ,提出了加固改造方案。所推荐的方案为在老桥两侧建造箱肋 ,并设置横向预应力筋将新建箱肋与老结构连接成整体 ,该方案加强了桥梁的整体性 ,提高了桥梁承载力 ,同时也加宽了桥面。此外 ,通过对比采用轻质微膨胀混凝土与微膨胀混凝土进行加固的数据比较 ,显示轻质微膨胀混凝土在旧桥加固中更具优势

Analysis of Deficiencies on Two-Way Curved Arch Bridges and Research on Rehabilitation

On the basis of the rehabilitation of Tumen Bridge in Hubei Provice, the present states of two-way curved arch bridges in our country are discussed and two methods of rehabilitation are given. The recommending method is the box arch rib is constructed on both sides of the old bridge and the old structure and the new structure are tied together with presstressed steel cables, the bridge is widened at the same time, the strength and stiffness are enhanced with no traffic interruption during the period of construction.In addition, the data of bridges rehabilitated with micro-expanded lightweight aggregate concrete and commen concrete are compared, they show the former has advantage over the latter.