When installing the anchor bolts, the first step is to initially correct the position of the top of the anchor bolts. The error range is between three and four millimeters. It must be within this range.
After the initial verticality is found, the tie bars or adjustable rebar top supports are fixed. After completing the above, fix the anchor bolts one by one. Finally, do a second alignment so that the error control range of the top of the anchor bolt is within two millimeters, so that the nuts of the supporting anchor bolts on the upper and lower steel plates of the fixed frame are tightened at the same time. After all the anchor bolts are calibrated and fixed, a comprehensive inspection should be carried out, and individual non-compliance should be corrected in time.
Finally, check the axis, and after confirming that it is correct, the concrete can be poured.