将自行研究配制的轻质微膨胀混凝土应用于拱肋的加固。推导出了膨胀剂作用下组合截面应力重分布计算公式,并考虑收缩、徐变的效应,对加固后的拱圈应力进行了计算,并与实测值进行了比较。此外,通过荷载试验检验,说明轻质混凝土完全可用于桥梁的主要承重结构。 Will study the preparation of lightweight micro-expansive concrete used in the reinforcement of the arch ribs. The calculation formula of stress redistribution of composite section under the action of expansive agent was deduced, and the effect of shrinkage and creep was considered. The stress of the strengthened arch was calculated and compared with the measured value. In addition, the test of load test shows that lightweight concrete can be fully used for the main load-bearing structure of the bridge.