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With the rise of steel construction in China, there is an increase in the demand for intersecting wire cutters. When it comes to architectural forms, especially steel structures, people may think of the “Bird's Nest”, CCTV’s new site, and Yintai Center.... The strange architecture in the architectural form without exception chose the steel structure, is the modern designer has the preference for it, is the constructor to love it?
Steel structures for large-scale public buildings have their own characteristics. “Steel structures are more popular nowadays, and their shape and construction are getting more and more difficult. For example, the current CCTV new site project, the Shanghai International Trade Center, and Guangzhou TV are representative of public buildings in China. Towers and National Stadium Projects. CCTV's new site project has both height and difficulty. It is a challenge to the construction of irregular building structures. The Shanghai International Trade Center is a super high-rise building. The tower structure of the Guangzhou TV Tower itself is already very high. Complex, construction with steel structures is even more complicated. The National Stadium can be described as a masterpiece of strange shapes." Take CCTV as an example, it has a tilt (big bidirectional tilt of 6 degrees) and double pick (70 meters and 60 meters respectively). (m) structure, and in the double-picking diagonal structure under the influence of gravity will have a certain degree of droop; the level of steel used in the project is higher, in the general steel structure, the project used mostly Q345D or Q390D, and " The CCTV project uses the Q420D and Q460D, which are rare in public buildings. This has brought a lot of technology to steel production and welding. Difficulty and requirement; the main building of CCTV's new site is composed of two towers and is connected by a 14-storey cantilever structure to form a giant “door” shape. The challenge of this form to traditional construction techniques is daunting. The cantilever is sagging under the effect of gravity, requiring anti-deformation during the construction process. It is required to calculate the preset value during the welding process of the steel structure. This value is almost not used in public construction in the past; in addition, the measurement of the project It is also a difficult problem. Due to the structural tilt, each pillar is positioned in the air. If the pre-adjustment value is added, the installation will be more difficult; as the steel grade is increased, the thickness is also increased to 135 mm. As many as 11 long and thick steel structures are welded in CCTV projects, and 7 have been completed. The characteristics of steel structures such as the “Bird's Nest” project are spatial curvilinear structures, which in turn lead to higher requirements for the manufacture of steel structures because once errors occur, the welding between steel structures is difficult to achieve smooth butt joints. In addition, its welding process Relatively stricter requirements are also required; the Yintai Center project is relatively conventional and not very complicated. The greatest difficulty in its construction is to assemble two 39-meter-long trusses on the ground, and then lift them with tower cranes. The internal and external cylinders of this project are in the form of a frame in the shape of a back-to-back. The internal cylinder is composed of 35 columns. It is mainly used for installing high-speed elevators. These columns require very accurate installation and verticality during construction. Otherwise, they will be installed during elevator installation. Affected. He said that the three phases of China World Trade Group, Yintai, and Nortel Center Engineering belong to the super high-rise, and adopt construction techniques such as long-span welding and long welding. It can be said that the construction of steel structures for large-scale public buildings in Beijing has its own features and difficulties.
China's steel construction started late at a high starting point. A century ago, a fire that lasted three days and three nights turned the entire city of Chicago into ashes. However, the Americans used this as an opportunity to ignite the new torch of architectural art. Buildings made of glass and steel have spread throughout the states of the United States, and even the general chain stores have become steel structures. This is the main reason why the sales volume of CNC wire-cutting wire saws has increased year by year... It is reported that it was not until the 20th century. In the mid-1980s, China's steel construction was still "zero." At this time, at the same time, China's steel structure construction that was decades later than in the West, at a very high starting point, followed a very high standard and strict requirements, making it difficult to start and develop rapidly. The starting point of China's steel structure construction can be traced back to 1984, when the China Construction Third Bureau won the bid for China's first steel structure building - Shenzhen Development Center. At that time, on the battlefield where construction was the main battle structure in China, the construction of steel structures was an undeveloped virgin land. Rapidly mastering the world’s advanced carbon dioxide gas welding technology has become the “goldsmith” in the hands of builders to complete the project. As a result, the top ten welders of the Bureau Dong Du Fusang learned. When experts from the Kawasaki Institute of Iron Training Center in Japan learned that most of them had only junior high school culture, they asserted that “If you have a solid foundation in culture, you have to study for three to six months. Your contract study period is only one month, and you can have three points by that time. One of the qualifications is not bad!” In the face of humiliation, 10 Chinese welders focused on studying for 7 hours each day. After lunch, they discussed and discussed each other. After 30 days, the 10 Chinese guys successfully completed their business. They subsequently played an important role in the construction of the Shenzhen Development Center Building Project. From the welding of 130 mm thickness to the previous record of 110 mm, to 350,000 mm of welded joints, all the ultrasonic and powder inspections were qualified, and 98% of the welds were welded. Reached the highest (D-class) standard in the United States... China's steel construction will be out of control!
The super high-rise and large-span special molding is the development direction. In the future, the development direction of steel structure construction should be super high-rise, large span and special shape. The special models are represented by the Guangzhou TV Tower, CCTV, and the Bird's Nest. The common point of these buildings is that concrete construction is impossible. At present, architectural forms such as the capital, Wuhan, Baiyun Airport, and some modern railway stations have begun to connect to the space curve, and they have been developed in the direction of large spans. Such a structure can only be completed in the form of steel structures. In addition, steel grades are getting higher and higher, and the amount of steel used in steel construction is also increasing. The Nortel Center is about 40,000 tons, the International Trade Phase III is about 60,000 tons, and CCTV is about 120,000 tons. As a professional steel wire cutting machine company, the products are tailor-made for 3-axis linkage, 4-axis, 5-axis, and 6-axis intersecting wire cutting machines. They have strong applicability, ranging in diameter from 60mm to 1800mm. It can be said that The best intersecting line cutting helper in today's steel industry!
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