由交通部公路科学研究所和有关单位共同承担的“提高旧桥承载能力的加固技术措施”课题,研究了在软弱地基上加固双曲拱桥的新技术,用原拱圈为下弦杆改双曲拱为桁架拱,减轻拱上建筑重量提高其整体受力性能,取得成功;当地基承载力足够时增强拱圈截面和加强横向联系,可以改善双曲拱桥结构整体性,提高承载能力;采用斜杆体外预应力法加固梁桥简 By the Highway Science Institute of the Ministry of Communications and the relevant units to jointly “enhance the carrying capacity of the old bridge reinforcement technology measures,” the subject of the study on the weak foundation reinforced double curved arch bridge new technology, with the original arch ring for the lower chord hyperbolic The arch is a truss arch, which can reduce the weight of the arch and improve the overall stress performance of the arch, and achieve success. When the foundation bearing capacity is sufficient, the cross section of the arch ring can be strengthened and the lateral connection can be strengthened, which can improve the structural integrity of the arch bridge and improve the carrying capacity. Reinforcement of Beam Bridge with External Prestress Method