(1) When the foundation of the vertical pole is not at the same height, the vertical sweeping pole at the high place must be extended to the low place for two spans and fixed with the vertical pole, and the height difference shall not be greater than 1m. The distance between the axis of the vertical pole above the slope and the slope shall not be less than 500mm.(2) The vertical deviation of the vertical pole should be controlled within 1 / 400 of the height of the frame.(3) When starting to set up the pole, set up a throw brace every 6 spans, until the wall connecting piece is installed stably, it can be removed according to the situation.