Advantages

Glass curtain wall is a new type of contemporary wall, which gives the building's most important feature is the architectural aesthetics, architectural function, building energy efficiency and building structure and other factors organically united, the building from different angles showing different shades, with the sun, moonlight, lighting changes to give a person the beauty of dynamic.

In the world's major cities on all continents have built a magnificent glass curtain wall buildings, such as the World Trade Center in New York, the Chicago Petroleum Building, the Sears Tower are used in the glass curtain wall. The Bank of China Tower in Hong Kong, the Great Wall Hotel in Beijing and the Shanghai Union Building have also been used.

The reflective insulating glass is 6 millimeters thick, and the self-weight of the wall is about 50kg/㎡, which has the advantages of being light and beautiful, not easy to pollute, and saving energy. The inner side of the outer glass of the curtain wall is coated with colorful metal coating, from the appearance of the whole piece of the outer wall is like a mirror, the sky and the surrounding environment into which the scenery, when the light changes, the image is colorful and endless changes.

In the reflection of light, the interior is not exposed to strong light, and the vision is soft. China in 1983 for the first time in Beijing Great Wall Hotel project used. Have been to the United States of America, New York, everyone will be its bustling cityscape convinced that the towering skyscrapers are spectacular, and its body of glass curtain wall reflected in the clear blue sky and fluttering white clouds, but also added a brilliant color.

So, how is the glass curtain wall made? Glass curtain wall refers to the exterior of the building as a decorative mirror glass, it is in the composition of float glass add trace Fe, Ni, Co, Se, etc., and made of tempered color transparent plate glass, which can absorb infrared rays, reduce solar radiation into the room, reduce indoor temperature. It can both reflect light like a mirror and transmit light like glass.

Disadvantages

Glass curtain walls also have some limitations, such as light pollution, energy consumption and other problems. But these problems with the emergence of new materials, new technologies, is gradually incorporated into the building shape, building materials, building energy efficiency in the comprehensive research system, as a whole design issues to be explored in depth.

Light pollution

Glass curtain wall was introduced into our country around the 1980s, Shenzhen, Guangzhou, Beijing, Shanghai and other large and medium-sized cities, large-scale use of glass curtain wall buildings can be seen everywhere, but light pollution in the "white pollution" in the city building using glass curtain wall is the most typical White pollution maker. Glass curtain wall light pollution, refers to the curtain wall of high-rise buildings on the use of coated glass or coated glass, when direct sunlight and sky light irradiation to the surface of the glass due to the specular reflection of the glass (i.e., the positive reflection) and the resulting reflected glare. In life, the noisy light produced by the reflection of glass curtain walls can cause vertigo, temporary blindness and often accidents. First of all, light pollution is the murderer of creating accidental traffic accidents. Standing in the busy traffic roadside or intersection of a glass curtain wall building, like a large piece of dozens of meters wide, nearly a hundred meters high huge mirror, glittering in the sunlight, and on the ground vehicles and traffic lights to reflect (or even multiple reflections). Reflected light into the high-speed car, will cause sudden temporary blindness and vision illusion, in the moment will stimulate the driver's vision, or make him feel dizzy, to pedestrians and drivers causing serious harm. According to some drivers in Beijing, when driving from west to east at around 4 p.m., the strong reflections stabbed their eyes so much that they could not open them, and if they were not vigilant, such light pollution could cause traffic accidents and threaten people's lives. Secondly, light pollution also brings trouble to the lives of nearby residents, especially those who are built near residential neighborhoods with glass curtain walls, which create reflections on the surrounding buildings.

According to research by optical experts, the reflected light from mirrored building glass is stronger than sunlight, and its reflectivity is as high as 82% to 90%. Summer sunlight is reflected into the living room, so that the average room temperature rises 4 to 6 ℃, air conditioning expenditure increased significantly, affecting people's normal residential use. What's more, a long time in the white light pollution environment of people working and living, easy to lead to vision loss, produce dizziness, insomnia, palpitations, loss of appetite and depression and other symptoms similar to neurasthenia, so that people's normal physiological and psychological changes in the long term will induce certain diseases. The State Environmental Protection Administration each year to receive a number of complaints across the country on light pollution, and attach great importance to this. In addition, the glass curtain wall is easy to be polluted, especially in the atmosphere with more dust, air pollution, drought and less rain in the northern region, the glass curtain wall is more prone to dust and dirt, which is the cityscape, not only can not increase the "light", but rather lose "face". And because of some glass curtain wall with poor material, construction quality is not high, the color is not uniform, ripples are different, resulting in glass curtain wall as ha-ha mirror in general. In the sun, each piece of glass is not to show a balanced and consistent light and shadow, but diffuse around.

Obviously, such a building, it is difficult to make people think of bright, luxury, can only make people feel the light strange and funny, the city's image is also greatly reduced. Although light pollution is very harmful, but as long as appropriate measures can be prevented. For the prevention of reflective glass curtain wall has three strokes: First, the selection of materials to choose rough materials such as hairy glass, and should not use the full reflective glass; Second, pay attention to the angle of the installation of glass curtain wall, try not to concave, sloping buildings using glass curtain wall; Third, you can install double-glass within the glass curtain wall, in the inner side of the glass affixed to the black light-absorbing materials, so that a large amount of light can be absorbed to avoid reflected light affecting the public.

Glass self-explosion

As a result of new buildings in recent years in the design of the glass panel size is getting bigger and bigger as well as a variety of glass curtain wall of the increasing number of more and more high. A variety of glass in the installation after the rupture of the "self-explosion" phenomenon occurs from time to time. Some building scaffolding has not yet begun to dismantle, the glass began to continuous occurrence of "spontaneous explosion", and the occurrence of injuries. Caused by the media, owners and other aspects are considered to be the quality of glass; and only in China such phenomena. "Self-explosion" is only a large number of tempered glass in the individual phenomenon. But many individual cases together, it becomes the subject of social and media hype. In fact, this is not the case. The phenomenon of glass breakage phenomenon of more factors, the same in foreign countries also appeared in the glass "self-blown" of the "glass rain" phenomenon.

Tempered glass so-called "self-blown" is mainly due to the presence of glass in the tiny nickel sulfide, single polycrystalline silicon, Al2O3 and other impurities. Under the continuous action of external stress, beyond the permissible stress of the glass, and the resulting "butterfly spot" state of the breakage. Glass is non-crystalline structure, so its compressive capacity is very strong, while the ability to resist bending, folding and twisting is very weak. Its surface compressive theoretical strength value can reach 1200kg/cm2, but due to the production process caused by the glass surface defects. Therefore, in JGJ113-2009 "building glass application technical regulations" to determine the strength of the glass is still relatively low.

Tempered glass strength is 3 to 5 times higher than the strength of ordinary glass. The strength of semi-tempered glass is 1 to 2 times higher than the strength of ordinary glass. Glass because of its crystal structure, so its compressive strength, while the strength of bending and folding resistance is low. Therefore, when the external tensile stress acting on the glass surface exceeds the allowable range of glass strength, the glass will break. The main causes of glass breakage are: design reasons; the reasons for the production process; the reasons for the transportation field; the reasons for the installation; the reasons for the settlement of the building; man-made reasons; natural causes; the quality of the original glass piece; glass "self-blowing" reasons, and so on.

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