Most kidney stones pass out o, cairn / ke()rn/ n. 1. a mound of rough stones built as a memorial or landmark, typically on a hilltop or skyline. Pick a style below, and copy the text for your bibliography. The Zhaozhou Bridge (Chinese: ) is the world's oldest open-spandrel stone segmental arch bridge. I also learned that the name of the bridge literally means safe crossing bridge.. I cant believe it was built such a long time ago and is still standing today. Constructed using limestone during the time of the Chinese Sui Dynasty, it spans 167 feet (51m) and has a striking 'open-spandrel', segmental arch design (a feature that didn't reach Europe. Its so cool that China has built such complex structures at such an early point in time. The area between the arch and the deck is known as the spandrel. - More than 2,000 years ago, the Han Dynasty established the Silk Road, a network of land-and-sea routes that built a bridge between the east and west transforming China into a geoeconomic. Polo Bridge All. Roman arch bridges were usually semicircular, although a number were segmental arch bridges (such as Alcontar Bridge), a bridge which has a curved arch that is less than a semicircle. . The American architect, educator, and designer Edward Durrell Stone (1902-1978) was an early practitioner o, quoin / k(w)oin/ n. 1. an external angle of a wall or building. Bridges of that design stretch over expressways around the world. More about the Technology behind the Rainbow Bridge. Each arch stone was fixed to its neighbors in the direction of the span with two iron clamps. Gothic pointed arches were also introduced, reducing lateral thrust, and spans increased as with the eccentric Puente del Diablo (1282). allowed the structure to be lighter in weight. In medieval Europe, bridge builders improved on the Roman structures by using narrower piers, thinner arch barrels and higher span-to-rise ratios on bridges. Joseph Needham, Clerks and Craftsmen in China and the West (Cambridge: Cambridge University Press, 1970). Bridge spans 123 feet. 0 Logout Google Bot DE; EN; FR; . These side arches serve two important functions: first, they reduce the total weight of the bridge by about 15.3% or approximately 700 tons, which is vital because of the low rise-to-span ratio and the large forces on the abutments it creates. great article, very descriptive, Wow, the Anji Bridge is really strong and well built if it lasted so long. //

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