The second stage is dominated by Qin and Han dynasties, including the Warring States and the Three Kingdoms, which is the period of creation and development of ancient bridges. At this time, not only the bricks of artificial building materials were invented, but also the arch coupon structure with the theme of masonry structure system was created, which created the prerequisite for the emergence of arch bridges later.
The third stage is dominated by the Tang and Song Dynasties, supplemented by the Jin, Southern and Northern Dynasties and the Sui, Tang and Five Dynasties, which is the heyday of the development of the ancient bridge. At this time, many bridges that attracted worldwide attention were created, such as Zhao Zhouqiao, an open-shouldered stone arch bridge initiated by Li Chun, a stonemason in Sui Dynasty.
Hongqiao, a stoplog wooden arch bridge invented by abandoned soldiers in the Northern Song Dynasty, Quanzhou Wan 'an Bridge founded in the Northern Song Dynasty, Liang Shi Bridge in the Southern Song Dynasty, and Chaozhou Bridge in Guangdong Province, which is a combination of open and closed pontoons.
The fourth stage is Yuan Dynasty, Ming Dynasty and Qing Dynasty, which is the saturation period of bridge development, and there are almost no major innovations and technological breakthroughs. At this time, the main achievement is to repair and transform some ancient bridges, leaving many construction documents for bridge construction, providing a lot of written materials for future generations.
Extended data:
According to materials: wooden bridge, stone bridge, brick bridge, concrete bridge and reinforced concrete bridge.
According to appearance: beam bridge arch bridge cable-stayed bridge suspension bridge viaduct combined system bridge
According to use: railway bridge, highway bridge, pipeline bridge, multifunctional bridge (overpass belongs to highway bridge).
According to the crossing objects, it is divided into: river-crossing bridges across rivers, valley-crossing bridges across valleys, overpass bridges across railways or highways, viaducts and trestles across urban areas, industrial areas or crop areas.
According to whether the bridge body can move, it can be divided into fixed bridge, open bridge and floating bridge.
According to the total length or span of the bridge, it can be divided into: extra large bridge, medium bridge, large bridge, medium bridge and small bridge.
References:
Baidu encyclopedia-bridge