1. The main structure has been completed and approved by the relevant departments. The finishing layer of the door and window opening wall will be carried out before construction.
2. Play the door and window position line according to the size shown in the figure, and determine the installation elevation of the door and window according to the +50cm horizontal line that has been played.
3. Check whether the size and quality of the reserved openings meet the requirements of the current national standards.
4. The reinforced concrete frame is placed on both sides of the window opening of the project, and the position of the brick is not necessary.
5. Prepare the scaffolding for installation and take safety precautions.
6. The ambient temperature is not lower than 5 °C.