Steel structure: super-tall large-span special modelling into the development direction

Steel structure: super-tall large-span special modelling into the development direction
When it comes to architectural form, especially in steel structure, for work, one might think of the "bird's nest", CCTV new site, the intime center... Throughout the urban construction, any large, the buildings in the form of invariably choose the steel structure, is the modern designer have a preference to its, builder is passionate about it? The author has come to CCTV new site project, and build three inningsSteel structure specialistOuYangChao spoke.

China Steel Structure Building http://www.jingtabuilding.com/steel-structure-building.html building late high starting point

Before no formal conversation OuYangChao introduces to the reporter a story first. A century ago, a lasted for three days and three nights of fire almost the entire Chicago reduced to ashes. Americans, however, take this opportunity to new torch lit the architectural art. With glass and steel as the material of each big buildings from all over the United States, even became a general chain steel structure...

It is reported, until the mid - 1980 - s, China steel structure building is still "zero". At this time, also, the late decades of western ChinaSteel structure construction, but on a high starting point, according to high standards and strict requirements, difficult start, develop rapidly. ChinaSteel structure constructionStarting point can be traced back to 1984, when the three zhongjian bureau winning China's first steel structure building, shenzhen development centre. At the time, the domestic construction of the main battlefield of concrete structure, steel structure construction is the virgin land. Quickly master the world advanced carbon dioxide gas shielded welding technology became the builder to complete the project in the hands of "an". So the agency 10 top welders dongdu fuso. Abnormal iron sichuan training center of Japan, experts in learned that most of them only junior high school culture, and asserts that "cultural foundation also have to learn 3 to 6 months, your learning contract period is only a month, when the time comes to have a third qualification is pretty good!" Face humiliation, 10 Chinese welders concentrated study seven hours a day, after school to discuss after the meal, and play. After 30 days, the 10 Chinese guy well completion. Later in shenzhen development center of construction engineering, they have played an important role, from welding refresh record was 110 mm 130 mm thickness, to 350000 linear meter by the ultrasound scanning zi powder flaw detection inspection qualified, again to 98% of the welding to the United States the highest standard of (D)... China's steel structure construction from now on will open the floodgates!

Large public Steel Sheds each has its own characteristics

OuYangChao said: "the steel structure is more popular now, and its modelling and construction difficulty is becoming more and more high, for example, now domestic representative public building of CCTV new site project, Shanghai international trade center, guangzhou TV tower as well as the national stadium project." CCTV's "new project both the height and the difficulty, is a challenge of irregular building structure construction, Shanghai international trade center is a tall building, guangzhou TV tower the tower structure itself has been very complicated, construction steel structure is more complex, the national stadium is called is the representative work of modelling." "CCTV", for example, its tilt overall two-way tilt (6 degrees) and double (70 m and 60 m respectively) structure, and in the diagonal direction of double pick structure under the action of gravity, there would be some sag; The steel used in the engineering level is higher, on averagesteel structure engineeringMostly used in Q345D or Q390D, while in "CCTV" project by Q420D and Q460D, this is rare in the general public, this is for steel fabrication and welding has led to a lot of technical difficulties and requirements; CCTV, the main consists of two towers, and are connected by a 14 layer of large cantilever structure, forming a huge "door" glyph. The model of traditional construction technology of daunting challenges. Cantilever under the action of gravity, sagging, requires reverse deformation in construction process, requirement in steel structure welding process still need to calculate the preset value, the value in the past almost can't use in the public; In addition, engineering measurement is also a problem, due to the structure and its each post should be high in the sky, if coupled with preset value, the difficulty of its installation will be bigger; As the steel level increase, its thickness is increased to 135 mm, long super thick steel structure welding up to 11 in the CCTV project, has now completed seven.

OuYangChao also told me that, like the "bird's nest" project of the steel structure is characterized by space curve structure, this creates higher demand for steel structure manufacture, because once appear error, are difficult to butt welding between steel structure, its welding process is also relatively more strict; The intime center project is regular, not very complicated, its construction is the biggest difficulty in 39 meters long truss assemble two root on the ground, and then use tower crane hoisting. The engineering part, shell back glyph forms the framework of on the whole, inner barrel is composed of 35 post, mainly for the high-speed elevator installation, requires the installation of the pillars in the construction of very precise and vertical degree, or in the elevator installation will be affected. Itc three period, the intime, he says, and all three are of super-tall nortel center project, and adopts the construction technology such as large span, long welding. Large public construction steel structure, so to speak, Beijing have difficulty and distinctive.

Super-tall large-span special modelling is the development direction

OuYangChao pointed out that the development direction of steel structure building is tall, big span, and special model from three aspects. Special modelling to guangzhou television tower and "CCTV", "bird's nest", these buildings have in common is not possible to use concrete construction. And at present such as capital, wuhan, baiyun airport and some of the modern railway station architectural form are connected to the space curve, the direction of large span, this structure can only be performed by steel structure in the form of a. In addition, the steel grade is higher and higher, steel structure building with steel quantity is becoming more and more big. Nortel center about 40000 tons, itc three periods of about 60000 tons, "CCTV" about 120000 tons.
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