The following points need to be paid attention to during the use of the large hexagon of the steel structure:
The treatment, storage time and storage conditions of the friction surface should be the same as the storage time and conditions of the friction coefficient specimen.
The friction surface of the construction site should be protected from being polluted by oil and paint, and if there is pollution, it must be thoroughly cleaned.
The bolt should be able to penetrate the bolt hole freely, if the individual cannot be freely penetrated, the reamer can be used to repair the hole.
When installing high-strength bolts, the friction surface should always be kept dry and should not be operated in the rain.
High-strength bolts must be strong in two times (initial and final screwing), and the initial screwing value should be 50% to 70% of the final screwing value.
There are two kinds of fastening methods for large hexagonal head high-strength bolts: torque method and angle method. The screwing sequence between different floors is the top floor, the bottom floor, and the middle floor.
The torsional shear high-strength bolt is fastened with an electric wrench, and the final screw is subject to the tail plum blossom head unscrewed, and if the electric wrench cannot be used due to structural reasons, it should be replaced with a hexagonal head high-strength bolt.
Please note that these precautions need to follow the relevant standards and regulations to ensure the correct use and safety performance of the large hexagon of the steel structure. If you are unsure of how to proceed or have any doubts, please consult a professional or professional body.