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199 1 year, American society of civil engineers selected Anji bridge as 12 "milestone of international historical civil engineering" and built a bronze medal monument of "international historical civil engineering monument" on the east side of the north end of the bridge. Zhao Zhouqiao, also known as Anji Bridge (named after Song Zhezong, which means "helping people"), is located on the Weihe River in Zhao County, Hebei Province. It is the oldest and best-preserved huge stone arch bridge in the world. Zhao Zhouqiao was chosen as the world's earliest open-shouldered stone arch bridge by world record association, China, creating the world's best. Known as "one of Four Treasures of the Study in North China". The bridge is 50.82 meters long, 37.02 meters across, 7.23 meters high, 9.6 meters wide at both ends, slightly narrower in the middle and 9 meters wide. Because the shoulders at both ends of the bridge have two small holes, which are not solid, it is called open shoulder type, which is a creation in the history of bridge building in the world (called full shoulder type or solid shoulder type without small arch). There are many things on the bridge, many kinds and colorful. Zhang Kun of the Tang Dynasty said that looking at the bridge from a distance is like: "When the moon rises at the beginning of the cloud, Changhong drinks a river". Zhao Zhouqiao was built in 605 AD, more than 400 years ago, and experienced 10 floods, 8 wars and many earthquakes. Map of Zhao Zhouqiao.

This data comes from Baidu map, and the final result is subject to Baidu map data.

Especially 1966 occurred in Xingtai, which is more than 40 kilometers away, and there is also a 4.0 earthquake here, and Zhao Zhouqiao was not damaged. Mao Yisheng, a famous bridge expert, said that no matter what the internal structure of the bridge is, it only means that it can exist for 1300 years. 1963 The flood flooded the arch of the bridge. According to the local old man, standing on the bridge can feel the bridge body shaking greatly. According to records, Zhao Zhouqiao has been restored nine times since its establishment. Adding two small arch coupons at the upper end of the main arch coupon can save materials, reduce the dead weight of the bridge (reduce the dead weight 15%) and increase the discharge of river water under the bridge. Third, make the bridge more beautiful. 1979 in may, a joint investigation team composed of four units, including the natural history group of China academy of sciences, investigated the bridge foundation in Zhao Zhouqiao. The weight of Zhao Zhouqiao is 2,800 tons, and its foundation is only a abutment with a height of 1.55 meters made of five layers of stones, which is directly built on natural sand and gravel. Such a shallow abutment is unbelievable. When Mr. Liang Sicheng inspected 1933, he thought that it was only a diamond wall to prevent water erosion, but not the foundation to bear the full load of the bridge ticket. In his report, he wrote: "In order to measure the coupon base, we dug at the foot of the North coupon, but now about 70-80 cm below the riverbed, the statue of Li Chun with the coupon base is found."

Put down the flat stone wall. Stone * * * has five floors, and the height of * * * is1.58m. Each floor is slightly higher than the upper one, and there is no solid foundation below. Obviously, it is just a diamond wall used to prevent water erosion, not a foundation bearing the full load of bridge vouchers. Because water will be seen in another 30-40 cm, unless large-scale excavation is carried out, it is really impossible to reach the bridge foundation position that we speculate according to the theory. "In order to protect Zhao Zhouqiao, the newly built bridge at 100 meters east of Zhao Zhouqiao at the end of last century still uses Zhao Zhouqiao, but the number of small arches on the main arch is increased to five on one side, and there are wheel marks and knee marks on the bridge.