High-strength bolts are mainly used in steel structur […]
High-strength bolts are mainly used in steel structure engineering to connect the connection points of steel structure steel plates. High-strength bolts are divided into two types according to the construction process: hexagon socket head bolts and torsion shear-type high-strength bolts. The connection performance and its mechanical properties are the same, and the bolt axial force is determined by the torque. , But fundamentally, the two are still very different. Let’s take a look at the difference between the hexagon socket head bolt and the torsion shear-type high-strength bolt.
1. From the appearance point of view-the appearance of the hex nut and the torsion shear-type high-strength bolt is different, the head of the large hex head is a hex type. The torsion shear head is semi-circular, and there is a plum head at the end of the bolt.
2. From the perspective of the installation method-the hexagon socket head bolt is installed with a torque wrench. The torsion shear-type high-strength bolt is controlled by the Torx head at the tail during the installation process, and the bolt is tightened in the opposite direction by the reaction force of the torque until the straight tooth end of the bolt is broken.
3. From the perspective of the matching method-the matching of hexagonal nuts and torsion shear-type high-strength bolts is different. Each set of the large hexagon is equipped with a bolt, a nut, and two flat washers. The torsion shear-type is a bolt, a nut, and a flat washer.
4. From the perspective of torque control-the torque of large hexagon high-strength bolts is controlled by construction tools, while torsion-shear type high-strength bolts are self-scalar bolts, and their construction tightening torque is determined by the screw and bolt tail plum head The diameter of the cut is determined, that is, controlled by its torsion torque, and a special electric wrench should be used during construction.
In general, large hexagonal high-strength bolts belong to the high-strength grade of ordinary screws, while torsion shear-type high-strength bolts are improved types of large hexagonal high-strength bolts. Although they are the same kind of bolts, they are still very different in some subtle aspects. . Compared with the two, the torsion shear-type high-strength bolts have the advantages of convenient construction, intuitive inspection, good force, and quality. Most of the high-rise steel structure projects adopt this form.