The application of architectural curtain walls began in the late 19th century, when they were only used in parts of buildings and on a small scale. The "Crystal Palace" built for the Industrial Exposition in London in 1851 was the earliest primary architectural curtain wall. In the 1950s, with the development of architectural technology, glass curtain wall began to be applied to the building envelope on a large scale, announcing the arrival of the era of architectural curtain wall. In the 1980s, with the development of building curtain wall technology and the progress of glass production technology and processing technology, glass curtain wall has been more widely used. In 1981, the first glass curtain wall in Mainland China appeared on the front facade of the Canton Fair. In 1984, the Great Wall Hotel in Beijing became the first high-rise building with a glass curtain wall. For decades, with the sustained and rapid development of the national economy and the speeding up of urbanization, the construction curtain wall industry achieved from scratch, from foreign unify the whole country to the dominance of the domestic companies, from imitation to leapfrog development of independent innovation, by the early 21st century our country has been the first in the world architectural curtain wall structure production power and the use of power.
The bending strength of glass plate is very high, especially toughened glass plate. Therefore, the glass panel of the glass curtain wall is very thin, usually 6mm~10mm. Even if hollow glass or laminated hollow glass is used, the panel is composed of 2 or 3 layers of glass, the weight per unit area is only 0.3KN /m2~ 0.7KN/m2, far less than the concrete wall of 3.5KN/m2~ 5.0kN /m2. The weight of glass curtain wall is approximately equivalent to 1/8~1/5 of brick wall and concrete wall. The light weight of glass curtain wall makes it the first choice of wall material for high-rise buildings and super high-rise buildings. Although metal plate also meets the requirements of lightweight wall, but metal plate is not transparent, which does not have transparent, crystal clear, elegant texture, so it is not favored by architects in super high-rise buildings, rarely used.
At present, PVB is widely used as intermediate film for laminated glass curtain wall. PVB has been used for many years and is widely known in curtain wall industry. However, this kind of film was originally developed for automobile glass, not for the development of curtain wall building, so it is elastic, relatively soft, small shear modulus, there will be significant relative slip between the two glasses after the force, small bearing capacity, large bending deformation.
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Post time: Aug-19-2022
