1. Center bolts center deviation: anchor bolts in the diameter of 30mm below the center line within 30mm offset, you can first use oxygen acetylene bolts roasted, and then use the sledgehammer bolt (or jack jacking) After correction, use steel plate welding reinforcement, to prevent tightening the bolt when the recovery. If the bolt spacing is not right, you can use oxygen acetylene flame roasted after hammering with a sledge, in the middle of the steel plate reinforcement, in the subsequent grouting when it is dead. For larger bolts (greater than 30mm in diameter), the bolt should be cut off, with a piece of steel welded in the middle of the bolt, such as the bolt strength is not enough, can be welded on both sides of the bolt two reinforced steel plate, its length shall not Less than 3 to 4 times the diameter of the bolt.
2. Determination of the height of the anchor bolts: When the bolts are too high, the upper part of the bolts shall be cut. In the set of threads, to prevent the infiltration of oil on the basis of concrete corrosion and affect the quality of the foundation. If the bolt is too low (less than its required height of 15mm), can not be used to lengthen the heating method, you can dig a deep hole in the bolt around the pit at about 100mm from the bottom of the bolt cut off, another welding a new bolt, Meet the requirements, and then use round steel reinforcement. Reinforcement round bar length is generally 4 to 5 times the diameter of the bolt.