Application Research On Existing Concrete Bridge Upper Structure Strengthening Methods

With the rapid development of social economy,our country has become a big bridge.Maintain safety and smoothness of highway network,to ensure the normal use of health,the economic benefits of act as a bridge to be effective.Many existing Bridges in our country,the concrete bridge occupies a considerable proportion.In use process,these Bridges will be aging of materials,structural damage an-d other problems.Due to the increase in traffic volume greatly in recent years a nd heavy vehicle and overload vehicles,increasing the proportion to bridge structure have br-ought many diseases,reduce the use of the bridge function,become the bottleneck of affecting highway capacity bridge.To meet the requirements of bridge operation,from an economic perspective,some Bridges have to early into the overhaul or repair the maintenance cycle.In this paper,classifying the common deterioration problems of concrete bridge,introduced simply supported plate,prestressed concrete continuous plate,prestressed concrete simply supported beam,the disease of prestressed concrete continuous beam.For each disease,sums up the common reinforcement methods,each of the strengthening methods have different characteristics,effect is different,its construction process control points are also different.On summarizing the characteristics and construction control key points of these methods on the basis of the commonly used enlarged cross section method,paste method for bridge,external prestressing method and comprehensive strengthening methods for modeling and analysis of the flexural bearing capacity,deflection to improve the effect and rate of crack control,puts forward three methods of the application of the bridge and the applicable condition of each method,in order to make up the lack of standards in engineering application,providing a reference for similar projects.