The tightening of high-strength nuts is divided into initial tightening, re-tightening, and final tightening. The initial tightening torque is 50% of the construction torque, and the bolts are tightened symmetrically with a quick wrench. The retightening torque is equal to the initial tightening torque, and the tower connecting bolts are tightened in a symmetrical star-shaped order with a hydraulic wrench. In order to avoid neglect, for the high-strength bolts after initial tightening, retightening and final tightening, the nuts should be marked with color. After the inspection, change the high-strength bolts to another color and paint the logo on the nut. When assembling high-strength nut joints, the side of the nut with the round table should face the side with the chamfer of the washer. When assembling the joint pair of high-strength bolts with large hexagonal heads, the chamfered side of the washer under the bolt head should face the bolt head. When assembling high-strength bolts, it is forbidden to forcibly penetrate the bolts (such as hitting with a hammer). If it cannot be passed at will, the hole should be trimmed with a tap, and the hole diameter after trimming should be less than 1.2 times the bolt hole diameter. When repairing the hole, in order to prevent the iron pin from falling into it, all the bolts around the hole should be tightened before reaming, and it should be done after removing the tight fit. Oxygen cutting drilling is prohibited. When assembling high-strength bolts, the friction surface of the components should be kept dry, and work in the rain is not allowed. When tightening high-strength bolts, only increase torque on the nut. Bolting is permitted only when space is limited. A high-strength nut is a high-toughness bolt, which is a standard component. In general, high-strength bolts can bear a larger load than ordinary bolts of the same specification. Therefore, the application range of high-strength bolts is relatively wide, and high-strength bolts are mainly used in steel structure engineering, which can better ensure the stability of the project. But we need to pay attention to some things when assembling, let's explain it to Preet. In recent years, U-Shield has returned home, which can better ensure a good administrative quota.