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What should be paid attention to when installing bolts during steel structure installation?


Release Time:

2022-10-21

High-strength bolts are most used in the installation of steel structures, and the following problems often occur in practice: Bolts are less exposed or lower than nuts; The bolts are not tightened, and the plum blossom head is screwed off during the twisting and shearing process, and the large hexagonal shape is not marked with the initial and final screwing; During the actual installation process, the original layer of protective paper on the friction surface was not completely torn off; Use high-strength bolts for temporary fixing, and do not paint seal within two days and two nights after installation; The torque and axial force were not re-tested, and the fastening torque was not calculated in strict accordance with the relevant regulations;

What should be paid attention to when installing bolts during steel structure installation?

High-strength bolts are most used in the installation of steel structures, and the following problems often occur in practice:

Bolts are less exposed or lower than nuts;

The bolts are not tightened, and the plum blossom head is screwed off during the twisting and shearing process, and the large hexagonal shape is not marked with the initial and final screwing;

During the actual installation process, the original layer of protective paper on the friction surface was not completely torn off;

Use high-strength bolts for temporary fixing, and do not paint seal within two days and two nights after installation;

The torque and axial force were not re-tested, and the fastening torque was not calculated in strict accordance with the relevant regulations;

The friction coefficient of the steel structure has not been strictly tested and calculated;

The tie rod bolts used in the installation process are not tightened, or the tie rod itself is not straight, resulting in too small a contact surface between the nut and the base metal, making it difficult to perform perforation operations.
 

 

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What are the classification and use of high-strength bolts?

High-strength bolts are special bolts made of high-quality carbon steel or low-alloy steel. They are called high-strength bolts because of their high strength. High-strength bolt connections have the advantages of simple and fast installation, good mechanical performance, assembly and disassembly, high pressure bearing, safety and reliability, etc. High-strength bolts are a new type of steel structure connection method developed after riveting connection, and have now developed into one of the main means of steel structure connection today. 1. Classification of high-strength bolts High-strength bolts can be divided into two types: large hexagonal head type and torsion shear type in appearance; if they are divided into 8.8, 10.9, 12.9, etc., according to the performance grade, the large hexagonal head high-strength bolts currently used in our country have 8.8 and 10.9 grades, while the torsion shear type high-strength bolt strength bolt is only 10.9 grades. The large hexagonal head high-strength bolt connection pair consists of a bolt, a nut and two washers (the screw head and the nut each have a washer): the torsion shear type high-strength bolt connection pair consists of bolts, nuts and washers. When bolts, nuts and washers form a connection pair, their performance levels must match. 2. According to the connection method, high-strength bolts can be divided into three types: friction connection, tensile connection and pressure connection. Friction connection and pressure-bearing connection are both shear connection. Bolt friction connection trans