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What should I do if the anchor bolts are loose inside?

Update:23-07-2020
Summary:

An anchor bolt is a tool embedded in the ground or foun […]


An anchor bolt is a tool embedded in the ground or foundation to connect the ground or foundation to machines and equipment. Q235 steel is generally used, that is, light round. The steel bar is very strong, and the thread of the nut is not as easy as rounding. For round bolts, the depth is generally 25 times its diameter, and then a 90-degree hook with a length of 120 mm is made. If the bolt diameter is too deep, a square plate can be welded to the bolt end to make a large head. The buried depth and the hook must ensure the friction between the bolt and the foundation, so that the bolt will not be pulled out. The anchor bolts have the function of fixing equipment, and will not produce strong vibration and impact.
1. The height of the anchor bolts is unqualified
Cut off the excess part and rework the threads; when the bolt is low and the difference is less than 15 mm, use an oxyacetylene flame to make the bolt red, and then stretch the bolt.
2. The anchor bolts are loose inside
When the bolt is loose, knock the bolt back to its original position and shovel the hole of the foundation into the shape of large, medium and small ends. Then, two vertical and horizontal round bars shall be welded on the bolts. The pit should be washed with water and grout, and the bolts should be tightened after solidification.
3. Intermediate deviation
If the bolt diameter is less than 30 mm and the center deviation is within 10-30 mm, use an oxyacetylene flame to burn the bolt red and bend it with a sledgehammer, and then reinforce the welded steel plate to prevent the bolt from returning to its original shape when tightened . If the bolt diameter is greater than 30 mm and the deviation is large, the bolt can be cut off and a steel plate welded between the bolts. If the bolt strength is not enough, two steel plates can be welded on both sides of the bolt for reinforcement. The length of the reinforcement plate should be 3-4 times the bolt diameter.

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