1. Lifting steel column

1. Check the foundation again, including the exposed length of foundation bolts, the deviation between the center line of foundation bolts and the date line, the spacing of foundation bolts and the foundation elevation. These nonconforming products can be removed after treatment.

2. In order to control the installation height of the column, the position of 500mm is also pre marked on the visible part of the column, so as to adjust and correct the height during installation. After installing the steel column on the basis of qualified re measurement, first bind the column with a steel wire rope, and the lifting point is selected at the position 1/3 of the column length from the end of the column. Lift the column with rotation method and lift the steel column to the installation position. Pillows must be delivered at the binding point.

2. Steel column correction

1. Draw the center line on the visible surface of the column in advance, and then use the theodolite to adjust the verticality of the column in two mutually perpendicular directions.