When the steel structure was installed on a building column, the threads of the Hexagon Flange Bolt were damaged, and the nuts could not be rotated and tightened. The reason for the damage of the bolt thread is: during transportation, assembly and unpacking, the anchor bolt is touched or stored improperly, and the thread is severely rusted. Or, after the bolts were buried, no maintenance measures were taken, and they were damaged by the external platform. The bolt is used as a conductive neutral wire for on-site electric welding, and the arc burning will damage the thread.
Use bolts as lashing points to tighten the traction rope. Due to the damage of the bolt thread, it is impossible to screw in the nut to fasten the steel structure column and other components, which will directly affect the transmission and stability of the structural force, and will have an unstable impact on the overall quality of steel structure buildings. Precautions for steel structure anchor bolts: During transportation, assembly and unpacking, the anchor bolts should be strengthened to maintain the threads. After using industrial petroleum jelly, it should be wrapped and tied with plastic film to prevent thread damage and corrosion.
It should be stored separately and not mixed with other parts and components to avoid collision with each other and damage to the threads. After the anchor bolts are buried, they must not be used as a fulcrum for bending processing or as a neutral line for electric welders, nor can they be used as a joint point for traction. When lifting the component, it should be operated correctly to avoid damage to the thread due to the degree of lateral impact.
The thread of the bolt has been damaged, and the following management measures can be taken: When the length of the thread does not exceed the effective length, the thread can be trimmed with a steel file until the nut is smoothly screwed in. If the thread damage length of Threaded Rods And Eye Bolts exceeds the regular effective length, the gas cutting method can be used to cut the length of the original thread section; then use the same material and specifications as the original bolt to process one end into a thread, and then connect the butt end Make the head, make it into a groove of 30°-45°, and then butt weld the lower end, equipped with a steel sleeve of corresponding diameter and length to stop welding and reinforcement.