Kawasaki Ultra
Steel: High-rise Span Into the Direction of Special Shape
It is reported that the mid-80s until the 20th century, the Chinese steel construction also remains "zero." Also at this time, several decades later a more western China steel structure construction, but in a very high starting point, according to a very high standard, very strict requirements, hard starting, growing rapidly. The starting point of China's steel structure construction can be traced back to 1984, the year in the successful construction of the Third Bureau of China's first steel building - Shenzhen Development Centre. At that time, construction of main concrete structure of the domestic battlefield, steel structure construction is virgin land. Quick access to the advanced technology of carbon dioxide gas welding into the hands of the builders to complete the project "a diamond." Thus, it 10 aces Going Fuso welders apprenticeship. Japan's Kawasaki Steel Training Centre experts know most of them are only in junior high school culture, they assert that "based on solid foundations of have to learn three to six months, your contract, just a month learning period, one-third of that time have one qualified to be dry! "Faced with the humiliation, 10 Chinese welders concentrated study seven hours a day, after-school meal each other of large. After 30 days, the 10 Chinese guy smooth closure. In the subsequent start of the Shenzhen Development Center Building project, they play an important role in the thickness of 130 mm from the weld flush old record of 110 mm to 350 000 running meters powder weld flaw detection by ultrasonic inspection and AIDS all qualified, and then to 98% of the welding achieved the highest U.S. (D grade) standard ... ... Since then, China's steel works out of control!
Different characteristics of large public buildings with steel structure
Ouyang Chao said: "The steel is now more popular, and its shape and construction of more and more difficult, and, for example, is representative of domestic public buildings CCTV new site project, Shanghai International Trade Center, Guangzhou TV Tower and the national stadium project . "CCTV" The new site also works both a high degree of difficulty is the construction of an irregular structural challenges, Shanghai International Trade Center is a high-rise building, the Guangzhou TV tower has its own pyramid structure is very complex, with steel for construction are more complex may be called the National Stadium is the singular form representative. "to" CCTV "as an example, which has a tilt (overall two-way tilt 6 degrees) and two percent (respectively 70 meters and 60 meters) structure, and oblique direction in this double structure under the action of gravity will have a droop; the project a higher level of steel used in the general steel construction used mostly Q345D or Q390D, the "CCTV" works were used Q420D and Q460D, which in general are rare in public buildings, which for steel making and welding has brought a lot of technical difficulty and requirements; the CCTV main building of the new site formed by the two tower, 14 floors of this structure by the connection form A huge "door" shape. This form of traditional building construction technology challenges is daunting. Cantilever under the action of gravity sag, requiring the construction process to be anti-deformation, requires welding process needs to calculate the preset value, this value is almost under construction in the past, less than the public; In addition, the project's measurement is difficult, due to structural tilting, resulting in shorter post to each of its high altitude location, if coupled with pre-adjusted value will be more difficult to install; with the increased level of steel, its thickness increased to 135 mm, super- long thick steel welding in the CCTV project in as many as 11, has completed seven.
Ouyang Chao also told the author, such as "Bird's Nest" project is characterized by its steel structure, space curve, this gave the production of steel brought higher requirements, because once the errors, difficult to weld steel butt between the smooth In addition, the welding process is also required to be tightened relative; Yintai Center works fairly routine, not very complex, the biggest difficulty of its construction is to assemble in the ground two 39 m long truss, then crane hoisting. Fall within the ambit of the project, a fine tube was returned to shape the framework of the overall form of post length within the tube formed by the 35, mainly for the installation of high-speed elevators, these pillars in the construction requires the installation and verticality are very accurate, or when the elevator installation affected. He said the World Trade 3, and Nortel Yintai Center works belong to the three high-rise, and with such a large span, long welding and other construction technology. Can be said that Beijing's large-scale steel construction with a distinctive public buildings, each more difficult.
Ultra-high-level modeling is to develop special long-span direction
Ouyang Chao pointed out that the future direction of development of steel construction should be high-rise, long span, and special shape three. Guangzhou TV Tower and the special form "CCTV", "Bird's Nest" as the representatives of these buildings have in common is not possible to use concrete. At present, such as capital, Wuhan, Baiyun Airport and some modern railway station architectural forms began to connect to the space curve, long-span direction, such structures can only be done by the form of steel. In addition, increasing levels of steel, steel building steel consumption is also growing. Nortel center about 4 million tons, about 60,000 tons Trade 3 "CCTV" about 120 thousand tons.
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