The erection sequence and process of scaffolding

What is the erection sequence and process of scaffolding? This is clearly stipulated and needs to be set up in accordance with the requirements.
1. The erection sequence of gantry scaffolding is: foundation preparation→placement of backing plate→placement of base→two vertical single-piece door frame→installation of cross bar→installation of scaffolding plate→repeat the process of installing door frame, cross bar and scaffolding plate on this basis .
2. The foundation must be tamped, and a layer of 100mm thick ballast should be spread, and drainage slopes should be made to prevent water accumulation.
3. Portal steel pipe scaffolding should be erected from one end to the other, and the up-step scaffolding should be carried out after the down-step scaffolding is completed. The erection direction is opposite to the next step.
4. For the erection of gantry scaffolding, first insert two gantry racks on the end base, and then install the cross bar to fix it, lock the lock piece, and then set up the future gantry, and install the cross bar immediately after each gantry. And lock piece.
5. Scissors support should be arranged on the outside of portal steel scaffolding, and the vertical and longitudinal directions should be arranged continuously.
6. The scaffolding must be reliably connected to the building. The distance between the connecting members shall not be greater than 3 steps in the horizontal direction, and no more than 3 steps in the vertical direction (when the height of the scaffolding is less than 20m), and 2 steps (when the height of the scaffold is more than 20m).