Zhao Zhouqiao is the oldest stone arch bridge in the world, more than 700 years earlier than Europe. Its architectural structure (open-shouldered) was the most advanced stone arch bridge structure at that time.

Jiangsu Suzhou baodai bridge

Baodai bridge, also known as Xiaochangqiao, is located in the southeast of Suzhou City, Jiangsu Province. It was built in 8 16 ~ 8 19. Originally, it was built to pull boats and fibers for trackers in grain transportation. Baodai Bridge has a total length of 317m, 53 spans, a deck width of 4. 1 m and a bridge end width of 6. 1 m.. It is made of hard and elegant golden stone. There are a pair of stone lions at each end of the bridge, and there are stone towers and pavilions at the north end. Baodai bridge is exquisitely designed and has a peculiar structure. It consists of 53-hole bridges with piers and connecting holes. The bridge gradually rises from 13 hole, reaches the highest point at 15 hole, and recovers its original height at 17 hole. This treatment makes the shape of the bridge varied, which not only reduces the weight of the bridge, but also increases the drainage area, thus reducing the impact of flood on the bridge body. The arch stone of this bridge is made of mortise and tenon stones instead of mortar. The bridge is magnificent, just like a treasure belt. The ancients praised it as "Changhong lying in the waves, towering into the clouds".

Daiyu Bridge in Beijing Summer Palace

Dai Yuqiao is in the west of Kunming Lake in the Summer Palace. This place was built in imitation of the "Su Causeway" of West Lake in Hangzhou during the Qianlong period. Because it is on the west side of the East dike, it is called "West dike". There are six bridges on the west dike, which are Jiehu Bridge, Hurricane Bridge, Yudai Bridge, Mirror Bridge, Training Bridge and Liuqiao from north to southeast. Among them, Daiyu Bridge is the only stone bridge with arch coupon structure in Xidi Sixth Bridge, which was the passage for Ganlong to take a boat from Kunming Lake to Yuquan Mountain at that time. The arch of the bridge is tall and thin, made of white marble and bluestone. On the white bridge pillar, there are all kinds of cranes flying in the clouds. The contour curve of the bridge is smooth and straight, shaped like jade belt, white as jade, so it is called jade belt bridge. The semi-circular bridge opening and the reflection in the water form a transparent full moon, so it is also the most beautiful of the six bridges.

Heilongtan Bridge in Lijiang, Yunnan

Black Dragon Pool is located at the foot of Xiangshan Mountain in Lijiang County. The pool is wide and the water is clear. In the second year of Qianlong in the Qing Dynasty, the Naxi people in Yunnan built Yuquan Longwang Temple here. Tan Deyue Building. In front of the building, there is a couplet inscribed by Guo Moruo: "Longtan reflects thirteen peaks, hidden in Long Zaitian, and the dragon is on the ground; Jade water is half a mile long, black jade is the body, and jade is the god. "There is a five-hole black dragon pool bridge with white marble in the south of Deyuelou. The bridge design is simple and simple, with a large arch in the middle and independent small arches on both sides, which complement each other with Deyue Building.