How to inspect bolts of space frame accessories

The quality inspection of space frame accessories high-strength bolts can generally be divided into two stages. The first link is the inspection of processing technology based on the production process, and the second link is the quality inspection of high-strength bolts after tightening. These two inspections are very important. The inspection of the first link directly determines the quality of high-strength bolts.

  Inspection content of the first stage:

high-strength bolt machine equipment method and machine process; joint surface processing and sorting; high-strength bolt tightening sequence and tightening method, etc. The inspection of the processing technology of machinery and equipment is the key point and the most important point in the quality inspection of high-strength bolt engineering construction.

  Second stage inspection content:

1. It is required to inspect large-angle high-strength bolts. It is required to use the hammer beating method to inspect the high-strength bolts to avoid missing screwing. This method is mainly to pinch one side of the nut with your fingers, which should be as close as possible to the side of the nut near the sealing ring, and then hit the other side of the nut with a hammer weighing 0.3-0.5 kg.   
2. Quality management and inspection of torsional shear high-strength bolt joints. Because of its structural characteristics, at the construction site, part of the plum blossom stem bears the reverse torque, so a part of the plum blossom head is twisted off. In other words, the bolt joint has released the same torque.

Therefore, during the inspection, it is only required to estimate that the red plum blossom head is twisted to be considered qualified. However, special wrenches cannot be used for anchor bolts at individual positions, so it is necessary to follow the inspection method of high-strength hexagonal bolts of the same diameter.