Precautions and procedures for installation of expansion bolts

The expansion bolt is composed of a bolt and an expansion tube. The tail end of the screw rod is conical, and the diameter of the cone exceeds the nominal diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the cone part moves according to the radial movement of the screw teeth, so that a very large positive pressure is generated on the outer surface of the expansion tube. In addition, the viewing angle of the cone is not large, so that frictional locking occurs between the wall, the expansion tube and the cone, thereby realizing the immobilization effect. The spring washer in the expansion bolt is a standard part. Because its opening is separated and has elasticity, it is called a spring washer. The function of the spring washer is to use the sharp bevel of the staggered opening to penetrate into the nut friendship washer to prevent the nut from loosening. Precautions for assembly of expansion bolts (expansion bolts) in practical application: 1. Hole depth: The relevant information shared is the length of the expansion tube, but I found that the depth is not enough during the actual construction process, and it is likely to be related to the residual dirt in the hole, so you should still be about 5mm deeper than the length of the expansion tube. As long as it is greater than or equal to the length of the expansion pipe, the length of the expansion bolt left underground is equivalent to or lower than the length of the expansion pipe. 2. Naturally, the harder the expansion bolts are to the ground, the better. It also mainly depends on the bearing capacity of the items you need to fix. The compressive compressive strength installed in concrete (C13-15) is five times that of bricks. 3. After a M6/8/10/12 expansion bolt is properly installed in the concrete, its ideal static bearing capacity is 120/170/320/510KG respectively. (Note that vibration will loosen the screws) Detailed installation process of expansion bolts (expansion bolts): 1. Choose a drill bit that matches the diameter and specification of the internal expansion bolts, and then drill holes with reference to the length of the internal expansion bolts. Drill as deep as you need for assembly, and then clean the holes. 2. Assemble the flat washers, spring washers and nuts, screw the nuts to the anchor bolts and the end to secure the thread, and then insert the internal expansion bolts into the holes. 3. Twist the wrench until the sealing ring and the surface of the fixing device are even. If there is no special regulation, generally tighten it by hand and then use the wrench for three to five turns.