What Is A High-strength Bolt

High-strength bolts are called high-strength bolt connection pairs in production, and are not generally referred to as high-strength bolts for short. High-strength bolts are mainly used in industrial and civil buildings, railway bridges, highway bridges, pipeline bridges, tower mast structures, boiler frames, boiler steel structures, large-span industrial plants, high-rise civil buildings, various towers, light steel structures, and Construction of heavy machinery and other steel structure connection buildings. Each connection pair includes a bolt, a nut, and two washers. High-strength bolts are divided into large hexagon head bolts and torsion shear bolts according to the installation characteristics. When assembling the high-strength torsion shear bolt connection pair, the side of the nut with the round table should face the chamfered side of the washer; the high-strength torsion shear type bolt connection pair for steel structures is an improved type of the steel structure large hexagon bolt connection pair, The main advantage is that the construction of larger hexagonal bolts is simple, and the construction space required is small. Use an electric wrench to directly unscrew the plum head at the tail. It is safe, simple and quick, and it is very convenient to check the construction quality. It does not require professionals or equipment, just general Visual inspection confirms that the plum blossom head has been screwed off to ensure the construction quality. However, the production cost of the strength torsion shear type bolt connection is higher than that of the hexagonal bolt. Each set of torsion shear type bolt connection set GB/T3632 contains one bolt, one nut, and one washer. When assembling the large hexagon head high-strength bolt connection, the chamfered side of the washer under the bolt head should face the bolt head; the large hexagon head high-strength bolt requires a torque wrench for construction, which requires a large operating space, and must be divided into initial tightening and final tightening. Twisting the two parts is completed, the construction is relatively troublesome with torsion shear type bolts; quality inspection also requires torque inspection, which requires professional equipment and quality inspectors. Large hexagonal high-strength bolts are pressure-bearing. The standards for high-strength bolt connection pairs for steel structures include: GB/T1228-2006 high-strength large hexagon head bolts for steel structures, GB/T1229-2006 high-strength large hexagon nuts for steel structures, and GB/T1230-2006 high-strength large hexagon nuts for steel structures. Strength washers, GB/T1231-2006 high-strength large hexagon head bolts, large hexagon nuts, washers technical conditions for steel structure, GB/T3632-2008 torsion shear type high-strength bolt connection pair for steel structure.