Self-explosion is an inherent characteristic of tempered glass, which is simply unavoidable. In order to reduce the self-detonation rate, the original glass piece can only be finely edged and the secondary heat treatment stopped, that is, hot dip treatment. Even so, the 1 ‰ self-explosive rate was once the limit. Once the glass explodes, the cost of changing the glass in high-rise and super high-rise buildings is much higher than the cost of the glass itself, and the risk of changing the construction is extremely high.
Semi-tempered heat treatment is similar to tempered glass, but the tempering level is low, and its external stress is not greater than 69 N / mm 2, so semi-tempered glass does not belong to the currently defined "safe glass". Because the appearance stress of semi-tempered glass is low, there is no risk of self-explosion. When it is not affected by the outside world, it will never explode on its own. In this sense, it is safer than tempered glass. Even if it is broken under the action of external force, because of the surrounding gussets, notches or silicone structural adhesive, the fragments formed by the radial cracks will not fall casually, and they can have time to stop the removal and replacement.
Based on the above reasons, when designing the glass of the building curtain wall, it is necessary to reasonably choose "safe glass" according to the practical situation. It is suggested that tempered insulating glass can be used on the bottom layer, and laminated insulating glass or semi-tempered laminated insulating glass should be used on the upper layer. The tempered insulating glass used for the bottom layer is due to the low height. Even if it is broken due to temperature and earthquakes, it will not damage the people and objects near the curtain wall due to falling, and will not harm the personnel due to sharp fragments of glass.
If the tempered glass is used for the curtain wall glass of high-rise and super high-rise buildings, once broken, the flying glass fragments will accelerate to fall due to gravity, resulting in casualties and economic losses. At the same time, the broken glass suddenly broke away from the frame, and the person standing near the glass was also very unsafe. Therefore, the high-rise building curtain wall should use laminated insulating glass-the outer layer is laminated and the inner layer is toughened. Even if the outer glass is shattered by impact, it will not fall apart, and the inner layer will not hurt people by impact. It is very reasonable in principle.
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