Fastener knowledge: how to eliminate the three problems of anchor bolts

The anchor bolts are used to fix the links, but there are often some common problems during use, such as: the center deviation of the anchor bolts, the improper height of the anchor bolts, and the three major problems common in the loosening of the anchor bolts. Handling these problems? Fastener knowledge: Eliminate the three major problems of anchor bolts: 1. Handling of center deviation. When the bolt diameter is less than 30mm and the center deviation is within (10~30)mm, the bolt is burnt red with oxyacetylene flame, and the steel plate is strengthened after being bent with a sledge hammer to prevent the bolt from being restored when the bolt is tightened. When the bolt diameter is larger than 30mm and the deviation is large, the bolt can be cut and welded with a steel plate in the middle of the bolt. If the bolt strength is not enough, two steel plates can be welded on both sides of the bolt. The length of the reinforcing steel plate should be 3~4 times of the bolt diameter. 2. Disposal of unqualified anchor bolt height (1) When the anchor bolt is too high, the upper part can be divided to re-thread. (2) When the bolt is low and the difference is less than 15mm, the bolt can be burned red with an oxyacetylene flame and then elongated. The lengthening method is: erecting a square steel plate with holes in the middle of the two stacked pads and fitting them on the anchor bolts, and tightening with a non-standard nut and torque on the two sides, thereby pulling the red parts of the bolts to lengthen the bolts. When the difference is more than 15mm, a deep pit can be dug around it, the bolt is cut at about 100mm from the bottom of the pit, and a new non-standard bolt made of the same diameter is welded and reinforced with two iron rods. The length of the iron bar is about 4 to 5 times the diameter of the bolt. 3. The loosening of the anchor bolts in the foundation. When the bolt is loose, the bolt should be knocked back to the original position, and the basic hole should be shovel into a large shape with a small size at both ends. Then, the two round steels are welded on the bolt, and the pit is rinsed and grouted with water, and solidified. Then tighten the bolts.