Steel structural bolts are commonly used connectors and are widely used in steel structural engineering. It is mainly used to connect the connection points of steel structural steel plates, which can achieve good fastening performance. Steel structural bolts have high strength and are a type of standard component. Different types of steel structural bolts have different classifications and construction methods. Below, we will provide a detailed explanation for your reference.
1, Application of steel structural bolts
Steel structural bolts are a type of high-strength bolt widely used in steel structural engineering. In steel structures, the fastening effect of steel structural bolts is very important, so its performance requirements are relatively high. Generally speaking, high-strength bolts of grade 8.8 or above are required for steel structures, as well as grade 10.9 and 12.9 steel structural bolts. For some steel structural bolts that do not require electroplating, natural color materials can be selected when purchasing.
When using steel structural bolts, it is important for outsiders to have prior knowledge. Only in this way can we avoid selecting the wrong product. Therefore, understanding the classification and construction methods of steel structural bolts is particularly important.
2, Classification of steel structural bolts
Steel structural bolts are mainly divided into two types: torsion shear high-strength bolts and large hexagonal high-strength bolts.
① Large hexagonal high-strength bolt
The large hexagonal high-strength bolt belongs to the high-strength grade of ordinary screws. It adopts a large hexagonal head design and has high fastening performance.
② Twist shear high-strength bolts
Twist shear high-strength bolts are improved on the basis of large hexagonal high-strength bolts. It has a T-shaped appearance and better construction performance. During the construction process, the upper and lower sections of the torsion shear high-strength bolt can be directly locked with a torque wrench at the same time, and its structural design can reduce the situation of bolt fracture caused by the construction process.
3, Steel structure bolt construction
The steel structure bolts during construction need to undergo two steps: initial tightening and final tightening.
① Initial tightness
The initial tightening of steel structural bolts requires the use of impact type electric wrenches or torque adjustable electric wrenches. When using an electric wrench for bolt installation, torque control should be carried out according to standards to avoid affecting the use of bolts.
② Final tightness
Steel structural bolts have different construction requirements in the final tightening process.
-For torsion shear steel structural bolts, a torsion shear electric wrench must be used for final tightening;
-For torque type steel structural bolts, a torque type electric wrench is required for final tightening.
It should be noted that when using an electric wrench for final tightening, the tightening torque of the bolt should be carefully controlled to avoid installation errors caused by over tightening or over loosening.
In summary, steel structural bolts, as an important connector, are widely used in steel structural engineering. When selecting and using steel structural bolts, it is important to have sufficient understanding of their classification and construction methods. This can effectively avoid some installation errors and usage issues.
