Reward score: 0- analysis time: February 2006-15 16: 16.

Questioner: dianmangongz- magic apprentice 1 level

Best answer

Explanatory text: Zhao Zhouqiao

Zhao Zhouqiao, also known as Anji Bridge, was built in the great cause of the Sui Dynasty (605-6 18) by the famous craftsman Li Chun. With a length of 64.40 meters and a span of 37.02 meters, it is a single-hole open-shouldered stone arch bridge with the largest span and the earliest construction in the world. 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).

Since 1400 years ago, Zhao Zhouqiao has experienced 10 floods, 8 wars and many earthquakes, especially 1966 Xingtai M7.6 earthquake. Xingtai is more than 40 kilometers away from here, and there is also a 4.0 earthquake here. Zhao Zhouqiao was not damaged. Mao Yisheng, a famous bridge expert, said that no matter what the internal structure of the bridge is, there can only be 65,433. 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 eight 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.

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 bridge foundation 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. He wrote in the report:

"In order to measure the coupon base, we dug at the foot of the coupon in the north, but now it is about 70-80 cm under the riverbed, that is, we found the stone wall lying flat under the coupon. 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 it is excavated on a large scale, it is impossible to reach the bridge foundation position that we speculate according to theory. "

1991September, Zhao Zhouqiao was selected as the 12 "International Civil Engineering Milestone" by the American Society of Civil Engineers.

And in the east side of the northern end of the bridge, there is a bronze medal monument of "International Civil Engineering Historical Monument".

In order to protect Zhao Zhouqiao, the new bridge structure built 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.

Answer: Maple Leaf Latte-Magician Level 4 2- 15 10:09

References:

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Interviewee: Perfect Fog-Assistant Level 311-2416: 34

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