(南京市城市道路管理中心， 江苏 南京 210018)
杜军（1964—）， 男， 学士， 研究员级高级工程师，从事城市桥梁隧道养护管理。
U445.7 + 2
Single-pier bridge has the light structure, less land occupation and other advantages, and is widely used in urban interchanges and viaducts. In recent years, the overturning accidents of single-pier bridges occur frequently. The bridge managers pay more and more attention to the stability problems of single-pier bridge structure. Combined with the engineering practices of the anti-overturning reinforcement and reconstruction of single-pier bridges in Nanjing, the reinforcement and reconstruction principles of single-pier bridge are firstly determined, then the reinforcement and reconstruction schemes of the different bridge types are compared, and the design of anti-overturning reinforcement is optimized, and finally, how to reconstruct the bridges under the conditions of feature state 1 and feature state 2 is summarized.