Treatment measures for high-strength bolt joint surface […]
Treatment measures for high-strength bolt joint surface
1. Friction type high-strength bolt connection requires the joint surface at the joint to be close and have sufficient friction coefficient. When the design drawing does not specify the treatment requirements for the joint surface, the following provisions shall be followed: sandblasting or shot blasting of the high-strength bolt joint surface to remove impurities such as rust and oil on the surface and reach the Sa2.5 level standard The roughness is 50 ~ 75μm, and its friction coefficient must not be less than 0.40. When there are provisions in the drawings, they shall be implemented in accordance with the drawings.
2. After processing the friction surface of the high-strength bolt connection, protective measures shall be taken to prevent contamination with dirt and oil. It is forbidden to make any marks on the friction surface of the high-strength bolt connection. In the factory, or during transportation and storage at the installation site, special precautions must be taken to prevent contamination of the connection surfaces. The installation unit should pay special attention to the characteristics of the cleanliness and friction surface of the connection plate of the high-strength bolt and the connection surface of the mother body. It is not allowed to use a grinder to grind the connection surface of the connection plate and the connection surface of the mother body.