Data analysis of large hexagon angle steel structural bolt and torsional shear bolt

Data analysis of large hexagon angle steel structural bolt and torsional shear bolt

       There are two sealing rings on the bolt connection pair of the big six angle steel structure, one on both sides of the bolt head and the nut; there is only one sealing ring and one on the nut side for the torsional shear high-strength bolt. The high-strength bolts with large hexagon head are divided into 8.8 and 10.9 grades, and the torsional shear type high-strength bolts are only 10.9 grades. Torque wrench is used for the structural bolts of large hexagon angle steel; electric wrench is used for the high-strength bolts of torsion shear type, and the box head can be screwed off.

       In the whole process of engineering construction, the final tightening torque of the big hexagon is not well controlled, and the average altitude is unfavorable for tightening and inspection, while the excellent practical operation of the torsional shear type is generally estimation. The distance between the high strength bolts of torsional shear type is larger than that between the bolts of large angle steel structure. When the portal steel structure is connected by blue plate, the use of torsional shear channel steel is 1-5% higher than that of large hexagon head channel steel, and the price of large hexagon head section steel is lower than that of torsional shear channel steel.

       The steel structure door type steel frame generally adopts the large hexagon head, and the double-layer and multi-layer buildings generally adopt the torsional shear type. In addition, there is also a kind of electric wrench with large hexagon head. For example, the space between the bolts with large hexagon head of the electric wrench structure should be relatively increased. In some cases, when the electric wrench can not be used for the construction of torsional shear bolt, the large hexagon angle steel structural bolt can be used. It can be tested according to the corner method, which is generally not easy to touch. Especially for some very large high-strength bolts, such as M33, M39, etc., if this unique large bolt can not be tested by scientific research in a general way, it can not be completed. Because the torque value of this bolt is quite large, it can not be completed with a torque wrench. At this time, visual angle method can be used, but the precondition is to carry out key experiments in high-strength bolt manufacturers. M16, M20, M22 and M24 are the common specifications and models of torsional shear type high-strength bolts. The construction quality is easy to ensure, but the quality of the electric wrench used in the domestic project construction is poor, and the price of the imported single version is too high.

       In addition, because the price of torsional shear bolt is higher than that of large hexagon angle structural bolt, most of the large hexagon angle structural bolts are used for single-sided steel structure construction. In the whole process of project construction, it is necessary to carry out regular inspection and correction of torque wrench. If it is impossible to retest the torque index of the large hexagon angle steel structural bolt on the spot of the project, it is proposed to use the torsional shear type high-strength bolt as much as possible to ensure the construction quality. In addition, the on-site engineering supervision staff must carry out inspection on the electric torque wrench applied to prevent some installation teams from adopting very Countermeasures in the absence of common tools, leading to the hidden danger of engineering construction quality and safety.

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