Method for unscrewing decollated bolts

The invention discloses a method for unscrewing decollated bolts. The method includes following steps: (1) flattening the cracking position of a decollated bolt on a connector; (2) drilling a hole with the diameter smaller than the outer diameter of the decollated bolt and the depth ranging from 10-20mm along a central line of the decollated bolt at the flattened position; (3) selecting a suitable hand tapping tool according to the diameter of the drilled hole, and tapping the drilled hole with the hand tapping tool to enable the thread direction in the drilled hole to be opposite to the thread direction of the decollated bolt; and (4) screwing a small bolt into the tapped threaded hole with a wrench. Since the thread direction in the drilled hole is opposite to the thread direction of the decollated bolt, the decollated bolt can be slowly unscrewed during the screwing process of the small bolt. The method for unscrewing decollated bolts is easy to handle, convenient and fast, and can protect the connector from deformation and damage caused by damages by external force.