后增钢桁架体外预应力加固新方法应用研究

Application of a New Method for External Prestressing Reinforcement of Post-increasing Steel Truss

为了解决混凝土梁式桥在服役期间出现承载能力和整体性能下降的问题,以大广高速公路陇海铁路立交桥的加固实例为背景,介绍了一种新型后增钢桁架体外预应力桥梁加固方法。实践证明:该加固方案能显著提高旧桥的承载能力和抗裂性能。此外,该工法便于施工、可操作性强,适用范围广,能为同类加固工程提供有益借鉴。

In order to solve the problem that the bearing capacity and overall performance of concrete girder bridges decrease during service,a new reinforcement method of external prestressing bridge with Post-reinforced steel truss was introduced based on the reinforcement example of Longhai Railway Overpass on Daguang Expressway.Practice had proved that the reinforcement scheme could significantly improve the bearing capacity and crack resistance of the old bridge.In addition,this method is easy to construct,easy to operate and has a wide range of applications,which can provide useful reference for similar reinforcement projects.