Method for detecting camber of prestressed concrete box girder based on ground three-dimensional laser scanning

The invention relates to a prestressed concrete box girder arching detection method based on ground three-dimensional laser scanning, and belongs to the technical field of bridge detection. The detection method comprises the steps that a three-dimensional laser scanner scans and collects original point cloud data, a point cloud model is preprocessed through point cloud registration, noise reduction and the like, complete box girder bottom plates and side faces are extracted, a bridge bottom edge curved surface is extracted, and the lowest points of the two ends of the box girder point cloud model are extracted and fitted into a reference plane; and performing height difference detection on each section of the longitudinal section of the box girder to find out planes on which two ends of an upward arch curved surface are located, and measuring by utilizing a three-dimensional coordinate of the point cloud model to obtain an upward arch value of each part of the box girder. According to the method, non-contact