Based on the survey of China steel box girder bridges’ steel box girder defects

summing up the typical defects of China steel box girder

we analyse every typical defect production mechanism and the reasons of leading to destruction of steel box girder

and propose steel box girder defects’ daily testing and maintenance technology.According to coating for the deterioration

steel corrosion

structural damage and other defects of steel box girder

we give the main items of the daily testing and maintenance technology and the main detection methods including manual visual inspection

ultrasonic testing

magnetic particle testing and eddy current testing.Studying the working principle of above testing methods

advantages and disadvantages

and scope of application

should be selected based on the actual requirements in the project.