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What kind of development course has the ancient bridges in China experienced in terms of building materials and construction technology?
Building materials develop with the evolution of human beings and have a very close relationship with human civilization. In all stages of human history, building materials are one of the main symbols to show their culture. The development of building materials is a long and slow process.

The period from primitive society to Han Dynasty is the formation period of China's ancient architectural system. In the early days of primitive society, primitive people lived in natural cliff caves or built wooden nests. In the late primitive society, in the north, our ancestors built simple caves or shallow caves with wooden frames and grass mud on earth caves with loess layers as walls, and then gradually developed to the ground. Dry-track wooden buildings have appeared in the south.

After entering the class society, in the Shang Dynasty, with mature rammed earth technology, large-scale palaces and tombs were built. During the Western Zhou Dynasty and the Spring and Autumn Period, the ruling class founded many cities with Miyagi as the center. The original simple wooden frame has been continuously improved since Business Weekly, and it has become the main structural mode of architecture in China. The appearance and use of tile solved the roof problem, which is an important progress of ancient architecture in China.

During the Warring States period, cities were larger than before, high-rise buildings were more developed, and bricks and colored paintings appeared.

During the Qin and Han dynasties, the technology of wooden frame structure has been gradually improved, and its main structural modes, such as lifting beam and crossing bucket, have matured, high-rise buildings are still popular, and multi-storey buildings are gradually increasing. The use of stones is increasing gradually.

By the Eastern Han Dynasty, all stone buildings appeared, such as shrines, stone thresholds and stone tombs.

Wei, Jin, Southern and Northern Dynasties is the development period of China's ancient architectural system. In terms of building materials, the output and quality of bricks and tiles are improved, and metal materials are used as decoration. Technically, the construction of a large number of wooden towers shows the high technology of wood structure; Brick structure is widely used in ground buildings, and the completion of Song Yue Temple Tower in Dengfeng, Henan Province marks the great progress of stone structure technology. Masons' carving skills have also reached a high level.

A large number of Buddhist buildings have been built, and many temples, towers, stones and exquisite sculptures and murals have appeared.

Sui and Tang Dynasties is the mature period of China ancient architecture system.

The sui dynasty built a well-planned Daxing city, dug the north-south grand canal and built the world's earliest open-shouldered stone bridge? The urban layout and architectural style of Anji Bridge in Tang Dynasty were grand and bold. Its Chang 'an City continued to operate on the basis of Sui Daxing City and became the largest city in the world at that time.

In terms of building materials, the application of bricks is gradually increasing, and the number of brick tombs and brick towers is increasing; The firing of coloured glaze is more advanced than that in the Southern and Northern Dynasties, and its application range is wider.

The earliest existing wooden structures in China are only those of Wutaishan, nanzenji and Beijushi in Tang Dynasty. Its architectural features are: the roof slope of single building is gentle, the eaves are far-reaching, the proportion of bucket arches is large, the columns are thick, the doors and windows are straight, and the style is solemn and simple.