Precautions: During transportation, loading and unloading, Roofing Bolts should be protected from thread damage. After using industrial petroleum jelly, it should be wrapped with plastic film to prevent thread damage and rust. It should be stored separately and should not be mixed with other parts and components to avoid damage to the threads.

After the roof bolt is buried, it shall not be used as a fulcrum for bending or the zero line of an electric welding machine, nor shall it be used as a binding point for tension. When lifting the component, it should be operated correctly to prevent the horizontal side impact force from damaging the thread, and the thread of the steel structure fixing screw bolt has been damaged. The following treatments can be used: when the thread length is not damaged, available steel is available.

Trim the threads until they are successfully screwed into the nut. If the thread length of the local foot bolt is greater than the specified effective length, you can cut the length of the original thread portion by gas cutting; otherwise, perform the following steps. Then use the same material and specifications as the original bolt to machine one end into a thread.

The butt end is then processed into a 30 ° -45 ° cross section of the head. After the butt and the lower end are butted, a steel sleeve of the corresponding diameter and length is inserted into the joint for welding reinforcement. After the casing is strengthened and reinforced, the diameter of the Round Head Bolt is larger than the diameter of the base plate, and the diameter of the base plate of the pillar can be appropriately increased.