Glass breakage caused by thermal stress
Thermal stress is an important cause of glass curtain wall breakage. Glass curtain wall is heated for many reasons, but the main heat source is the sun, when the sun on the surface of the glass curtain wall, glass is heated, if heated evenly, glass and glass of edge the central part of the uniform expansion at the same time, but if the uneven edge and inside the glass is heated, inside the glass will produce tensile stress, when the glass edge has broken mark or tiny crack, These defects are easily affected by thermal stress. With the increase of temperature difference, thermal stress will gradually increase the crack and finally lead to glass breakage.
The solution is to finish the edge of the glass first, using fine grinding edge or polishing edge to reduce the existence of small cracks; Secondly, the glass is tempered to enhance the glass resistance to temperature changes; The third is in the process of glass processing, handling, installation, the protection of glass must be properly, pay attention not to the edge of the glass and other hard object impact, friction, strictly abide by the operation procedures, especially during the installation process, if the framework inappropriate < too small or distortion), must remember not to use tongs to drop the glass edge, must correct the curtain wall frame, make it fit the size of the glass.
The glass curtain wall has poor fire resistance
The glass curtain wall is a non-flammable material, but it can soften and even melt in the presence of fire. Therefore, in modern curtain wall design, we must fully consider the requirements of building fire prevention. General glass curtain wall fire effect, fire integrity, fire insulation is very low, in the fire only a very short time will occur glass broken.
The solution is that in the actual construction process, designers carry out different designs according to different fire protection requirements of buildings. For buildings with general fire protection requirements, glass is made of glass bricks, tempered glass, small pieces of flat glass, etc. For buildings with high fire protection requirements, curtain wall glass is made of wire glass, single-piece fireproof glass, composite fireproof glass, fireproof hollow glass, etc. Composite fireproof glass is the most widely used fireproof curtain wall glass at present. When a fire occurs, the glass on the fire surface is heated and burst in a certain period of time, but because of the existence of fireproof film, the glass is adhered to the film and does not fall, maintaining the integrity of the curtain glass window. At the same time, due to the film itself has a fire prevention function, not only to prevent the spread of the fire, but also ensure that the temperature of the back fire surface does not rise rapidly, control the spread of the fire.
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Post time: Jun-05-2023
