January 1998 · Issue 1: Methods for Correcting Downward Deflection of the Main Girder of a Metallurgical Bridge Crane in Hunan Zheng Jinxian, Xiangtan Iron and Steel Company Abstract: The downward deflection of a bridge crane’s main girder is corrected using the principles of flame straightening. The correction process is as follows: First, an H-shaped support is spot-welded at the midpoint of the main girder; then, a hydraulic press is placed on the H-shaped support