Selection and quality of building glass
Fanyumaoyi Chinamirrom 2017-05-26 14:37:36
1 Safety of building glass
The safety of building glass contains two meanings: one is that the building glass does not destroy under normal conditions of use, and the other is that if the building glass is damaged or accidentally damaged under normal conditions of use, the human body will not be harmed by millions or the harm to the human body is reduced to the least. The application of architectural glass in different building parts with different load, under the corresponding load to carry out glass strength and steel calculation, glass curtain wall According to "Glass Curtain wall Engineering Technical Specification" JGJ102 calculation and to meet its design requirements, the glass can not be selected. Some building sites also stress the need to use safe glass, i.e. tempered and laminated. When the tempered glass is broken, it is fine granular, it will not bring great harm to people; when laminated glass is damaged, the PVB film will stick the broken glasses together and it is not easy to hurt people, so these two kinds of glass are called safety glass. Guarantee safety is the first threshold of architectural glass selection.
2 Function of building glass
Traditional building glass has only three functions, namely, shelter, shelter and light. The modern architectural glass has the traditional function besides, also has the light transmittance, the reflective, the heat insulation, the sound insulation, the fire resistance, the electromagnetic shielding and so on.
2.1 Light Transmittance
The transparency and transparence of glass are two concepts, and light transmittance is not necessarily transparent.
The transparency of the glass has excellent decorative effect, the application of glass light transmittance, can make the indoor lighting peaceful, quiet, warm. A strong indoor light can irritate people's eyes and make people restless. The light transmittance of glass can eliminate these unfavorable factors and increase the concealment of buildings. Modern buildings are using more and more light transmittance of glass.
The use of thermal reflective coating glass is designed for building energy-saving and aesthetic. Thermal reflective glass Not only has a color, its reflectivity is also higher than ordinary glass, usually between the 10, so the thermal reflective glass is a half transparent glass. Now the hot reflective glass is used extensively in the building, especially the curtain wall, it can be said that the application of Gegondans reflective glass in the curtain wall is the highest state of glass reflective application.
In the application of glass reflection should be limited to a reasonable range, not blindly pursuit of high reflectivity. The reflectivity is too high to destroy the beauty and harmony of architecture, but also to cause "light pollution".
2.3 Heat Insulating
Because the glass is transparent material, therefore, both heat conduction, convection and heat radiation three kinds of heat transfer form and glass is thin plate, in this sense, the glass is not good insulation. The thermal conductivity U value of the ordinary flat glass is up to 5.3, so the door and window are the main entrance of the building energy consumption, and the glass curtain wall is the main energy consumption. The glass is a transparent material, one is the heat conduction coefficient u value, the other is the masking coefficient se. In order to increase the heat insulation of glass, can choose ordinary insulating glass, its conductivity is 3, if want to further increase glass insulation, can choose low-e insulating glass, its heat conduction coefficient can be less than 0.2, its thermal insulation can be compared with the ordinary brick wall.
2.4 Sound Insulation
Ordinary glass sound insulation performance is relatively poor, its average sound insulation is 25, insulating glass due to the effect of the air layer of the average noise can reach 45dB, laminated glass can be up to 50dB of noise, is the best performance glass sound insulation. Laminated glass because of the viscoelastic material sandwiched between two pieces of glass, it eliminates the sound wave coupling between the two glasses, which greatly improves the sound insulation performance. If you want to further improve the sound insulation performance of glass, you can choose laminated insulating glass, or even double interlayer insulating glass.
2.5 Fire Resistance
Fireproof Glass is a glass that is transparent, can block and control heat radiation, smoke and flames, and prevent the spread of fire. Fireproof Glass is characterized by the ability to effectively limit the heat transfer of the glass surface, become opaque after heating, and have a certain thermal impact strength, at about 500 degrees Celsius still has protective effect. Fire-resistant glass is mainly composed of composite fireproof glass, wire clips and glass hollow bricks.
2.6 Electromagnetic Shielding
The permanent mechanism of the glass shielding electromagnetic wave has two methods, one is to have the transparent conductive film on the ordinary glass surface and the other is to clamp the wire mesh in laminated glass. Relatively speaking, the glass clamp wire mesh process is more complex, the equal parts are also high. If a higher shielding effect is required, the combination of the two technologies is generally used.
Electromagnetic shielding glass can generally be 1GHz frequency of electromagnetic attenuation 30, high-grade products can be attenuated 80dB, to prevent the role of indoor equipment.
3 Economics of the choice of architectural glass
Not the higher the security, the more full-featured, the higher the cost of glass is good glass. The correct way to choose glass is; security and functionality meet the design requirements, at the same time its equal parts as low as possible, economic good, is the scientific and reasonable choice for example, in the e-low insulating glass, the coating surface is located in the glass combination of the 2nd or 3rd surface, its thermal performance is not significant difference, but the price is related to a lot. In recent years, the state calls for building energy conservation, so the choice of building glass should consider its economy. In addition to considering the cost of construction, the cost of the building should also be considered. If the choice of insulating glass, although the cost is higher than the single piece of glass, but its excellent thermal insulation performance, reducing the building's refrigeration and heating costs, its comprehensive economic performance is good.
4 selection suggestions for building glass
To sum up, the principle of choosing architectural glass is to guarantee the safety, to meet the function and to balance the economy. Specific to the different parts of the building has a choice, sometimes there will be a variety of options so according to the architectural glass selection recommendations for reference only.