High-strength bolts are high-strength bolts and belong […]
High-strength bolts are high-strength bolts and belong to a standard piece. Under normal circumstances, high-strength bolts can withstand larger loads than normal bolts of the same specification.
The shape and connection structure of high-strength bolts are basically the same as those of ordinary bolts. The main difference between the two is that ordinary bolt connections rely on shaft pressure and shear resistance to transmit shear forces. When the nuts are tightened, the pretension of the bolts is small. Its influence is not taken into consideration; the working principle of the high-strength bolting is to intentionally apply a large pretension to the bolts, so that a compressive force is generated between the contact surfaces of the connected parts, and therefore there is a great friction perpendicular to the direction of the screw. Friction to transmit connecting shear. The pretensioning of high-strength bolts is achieved by tightening the nuts. Ordinary high-strength bolts generally adopt the torque method and the corner method. Torsion-type high-strength bolts use twisted bolt tails to control pretension.
High-strength bolted bolts are made of 10.9S or 8.8S high-quality alloy structural steel and heat-treated. High-strength bolt holes are drilled. The diameter of the friction type connected high-strength bolt is 1.5 to 2.0 mm larger than the nominal diameter d of the bolt; the diameter of the high-strength bolt connected to the pressure type is 1.0 to 1.5 mm larger than the nominal diameter d of the bolt.High-strength bolts are mainly used in steel structure engineering. A very important feature of high-strength bolts is limited to a single use, generally used for permanent connection, is strictly prohibited for repeated use