Box girder bottom crack detection device and use method thereof

The invention belongs to the technical field of bridge detection, and particularly discloses a box girder bottom crack detection device and a using method thereof.The box girder bottom crack detection device comprises a suspension frame and a detection component, the suspension frame is of a U-shaped structure and comprises a fixing block, a connecting frame and a sliding rail, one end of the connecting frame is arranged on one side of the fixing block, and the other end of the connecting frame is arranged on the sliding rail; the other end of the connecting frame is arranged at one end of the sliding rail, the sliding rail is parallel to the fixing block, and traveling wheels are arranged at the bottom of the fixing block; the detection part comprises a cavity and sliding devices, the sliding devices are arranged on the two sides of the bottom of the cavity, and the sliding devices are in sliding connection with the sliding rails. According to the invention, through the real-time positioning of the positioni