Expand the application of steel structure in curtain wall
Aluminum has a melting point of about 700 degrees, and zinc has a melting point of about 400 degrees, both well below steel's capacity of 1,450 degrees. After the fire, we often see that all the titanium zinc plate and insulation layer are burned off, but the steel skeleton and steel plate are still in place although deformed and twisted. In many curtain wall fires, the aluminum skeleton melts and the panels lose their support and fall off within 20 minutes.
It has become accepted practice that fireproof glass must have a steel frame. Aluminum curtain wall and stone curtain wall using steel frame more and more. The general glass curtain wall is still mainly aluminum, but the glass curtain wall and glass lighting roof of large public buildings have been generally supported by steel structure. In recent years, cold-formed thin-wall steel has been applied to glass curtain wall successfully. The appearance of the special thin steel profile for curtain wall can be compared with the beauty of aluminum profile, and the wall thickness is 1.5mm~2.5mm, and the section forms are diverse, which can meet the requirements of all kinds of glass curtain wall and glass lighting roof. At present, many high-grade glass curtain wall projects use thin steel profiles.
Don't let buildings become cages of fire
There is no absolutely safe glass, and there are certain risks with glass. The problem is rational use for maximum safety. Some documents define toughened glass and interlayer glass as safety glass, it is not proper actually. Monolithic tempered glass for glass beams, columns and floors is extremely dangerous.
Similarly, laminated glass can not hit through, do not fly, it is safe. But if used incorrectly, it can be very dangerous. In the super high-rise part of the curtain wall building, the fire can only rely on its own internal fire system, neither by external water irrigation, indoor personnel can not break the window to escape. In this case, all the curtain wall using laminated glass does not affect the fire safety, so it can be. But in the low-rise part and a large number of public buildings, some do not set up internal fire system, external rescue and broken window escape is an important means of survival; Even with internal fire protection, one more way to live could have saved more people. If all the so-called safety curtain glass window, will undoubtedly break this way, so that the building becomes a cage of fire. Once the fire, there is no rescue channel outside, there is no escape hole inside, very dangerous.
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Post time: Jul-11-2023
