1. Choose the right bolt specifications and materials
Bolt specifications: Choose the right thread diameter and length according to the thickness and force requirements of the connector.
Material selection: Choose the right material according to the use environment, such as carbon steel, stainless steel or alloy steel. High-strength bolts (such as grade 10.9 or grade 12.9) are suitable for high-load scenarios.
2. Follow the correct installation steps
Clean bolts and connectors: Make sure the surface of the bolts and screw holes is clean before installation, without oil, impurities or rust.
Use the right tools: Use a torque wrench to apply force evenly according to the preset torque to avoid excessive force causing thread slippage or coating peeling.
Cooperate with anti-loosening devices: Use anti-loosening washers, double nuts or nut anti-loosening agents to enhance shock resistance and anti-loosening effects.
3. Ensure the preload of the bolts
Torque coefficient test: For high-strength bolts, a torque coefficient test should be carried out to ensure that the preload meets the design requirements.
Torque control: Use a high-precision torque wrench to ensure that the error of the tightening torque does not exceed 2%.
4. Optimize the connection design
Use of washers: Make sure the chamfered side of the washer faces the nut bearing surface to prevent the washer from rotating.
Surface treatment: For steel structure connections, the connection surface should be flat, free of welding spatter, burrs, and oil.
5. Regular inspection and maintenance
Regular inspection: Regularly check the tightening status of the bolts to detect and deal with loose problems in a timely manner.
Anti-corrosion treatment: In humid or corrosive environments, the surface of the bolts should be treated with anti-corrosion, such as Dacromet coating.
6. Comply with relevant standards
GB/T 5783: Specifies the type, size and technical conditions of Hex Bolts, which are suitable for a variety of application scenarios.
JGJ 82-2011: Provides detailed technical regulations for high-strength bolt connections in steel structures, including construction sequence, torque control and friction surface treatment.
