Why can the hill-pushing method in the turret structure in the late feudal period prevent the corner beams and beams from projecting into a straight line on the palace top?

If the slopes of the two mountains at the top of the temple are exactly the same, then the angle beam should be a straight line when projected from the plane. The ancient buildings in China try to avoid this mechanical rigidity on the top of the main hall, and adopt the method of pushing mountains. Architectural examples say that the temple pushes the mountain, except for the eaves and corners, from the golden steps to the ridge steps, and the steps are deep. Because it is decreasing, the higher the ladder frame, the more outward the position across the melon column and the steeper the slope. At the roof purlin, the push-out distance is more obvious, so the plane projection of corner beam and shoulder is a continuous broken line, while the vertical ridge above is a curve that goes up and inward. Because of pushing the mountain, the roof purlin was pushed out of the original beam frame and had a cantilever part. The cleaning method is to add a column and a beam under the purlin head, so that the roof load of the cantilever part, especially the huge weight of the kiss, can be directly transferred to the beam. This beam is called Taiping beam and this column is called Leigong column.