The Book of Songs was compiled in the Spring and Autumn Period, probably from the early Zhou Dynasty to the middle of the Spring and Autumn Period. It can be inferred that "Hengmen" appeared in the middle of the Spring and Autumn Period at the latest. The transverse gate is a structure with two pillars and a beam. The old name "Hengmen" is the ancestor of today's archway.
There are only two kinds of archways in form-one is called "soaring" and the other is called "standing out from the crowd". As the name implies, the pillars of this archway are higher than the top of the Ming building; Another style of "not getting ahead" The highest peak of this archway is the main ridge of Ming architecture. If the division is more detailed, it can be divided according to the number of rooms and buildings in each archway.
No matter whether the column is prominent or not, it has the form of "one room and two columns", "three rooms and four columns" and "five rooms and six columns". The number of buildings on the top floor appears in the form of the first floor, the third floor, the fifth floor, the seventh floor and the ninth floor. Among the archways in Beijing, the largest is "five rooms, six columns and eleven floors". Most of the archways in the palace are not in the first place, while most of the archways in the street are in the sky.
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In the Tang Dynasty, all cities in China adopted the Li Fang system, and the city was divided into several square residential areas by criss-crossing checkerboard roads. These residential areas were called "houses" in the Tang Dynasty. Housing is the basic unit of residential area. There is a wall between the square and the square, and there is a door in the center of the wall for passage, which is called the square door.
Later, because the door didn't have much effect, it was just this form, so the people gradually called this square door a memorial archway.
Baidu encyclopedia-memorial archway