1. The setting chuck is used to block the embedded bolts according to the design position to prevent displacement during concrete pouring; The reserved hole of column low steel plate shall be enlarged, and the reserved hole shall be made after the hole position is determined before the concrete foundation is poured.
2. The vertical deviation should be corrected before fixing. Pre control measures for excessive vertical deviation of columns: steel columns should be hoisted in place according to the calculated hoisting points, and more than two hoisting methods must be adopted. Temporary fixation should be carried out during hoisting to prevent deformation; After the column is in place, temporary support shall be added in time.
3. If the secondary grouting method is adopted, the pouring hole (also as the exhaust hole) is opened in the base plate of the column, the uneven part at the bottom of the steel column is leveled with the steel backing plate, and the steel plate of the column base support is arranged according to the design elevation in advance, and then the secondary grouting is adopted. There are pre control measures for the gap at the foot of the steel column. Before the hoisting of the steel column, the foundation elevation should be strictly controlled, the measurement should be accurate, and the foundation surface should be carefully leveled according to the measured value.
