Shanghai Jiaozhou Road "11.15" major fire occurred, the accident investigation team determined the building external walls of the accident a large number of polyurethane foam using flammable materials, leading to an important reason for the rapid spread of fire. For a time, wall insulation materials, fire safety issues once again become the focus of public opinion.
CCTV, fire, fire,glue stick Jinan Olympic Sports Center, Shanghai Jiaozhou Road, the fire ... ... In recent years, with the building's exterior wall material-related fires occurred frequently, which makes thermal insulation system in construction widely used in polystyrene foam, polyurethane, etc. combustible materials frequently concern. With the gradual improvement of energy efficiency standards, polystyrene foam, polyurethane and other combustible materials, fire safety issues will become more apparent. So, how can science effectively prevent building fires caused by external insulation materials, industry experts said in an interview, exterior insulation and fire protection should be avoided three major errors.
Misunderstanding: in strict accordance with European standards and norms for classification.
It is understood that,glue gun at present, Europe and the United States related to the idea of standards is the burning of the insulation materials and systems to grade, corresponding to different systems used in different fire rating of the buildings. Combustible materials on the thermal insulation system provides for strict and clear height of its application, the provisions are basically only 22 meters above the allow the use of non-combustible materials, thermal insulation system, 22 meters can use combustible materials, the insulation system, even with 22 meters , when the thickness of thick polystyrene board (such as Germany more than 100 mm), or higher demands on the fire when a certain structure to take fire prevention measures, such as door and window openings with non-combustible materials in the fire to do construction, and set fire separation belt.
The experts believe that if strict application of classification standards and regulations in Europe and America is ideal, but the reality is that China is not allowed. The expert pointed out, Europe and other developed countries on the exterior wall of the studies have been nearly half a century, the basic theory, experimental research, laboratory testing and practical application control index has done a lot of work, laid a good foundation, but From their point of departure to see the emphasis placed on people-oriented, safety first guiding principle is that we should seriously study and learn from them. Therefore, if used directly is ideal, but the current situation in China must also be considered. China is a large number of organic combustible wall insulation insulation materials (EPS, XPS, PU, etc.), is the lack of quality clearance of non-combustible insulation materials such as ore (rock) cotton sheet, and because most of the construction is in China's high-level, if in full accordance with European and American implementation of national standards, organic insulation materials in the 22 meters below the limit, the excess of organic insulation material will not burn a serious shortage of materials and supplies, would seriously affect China's building energy efficiency work.
Myth: solution construction phase of the fire hazard fire insulation problem can be solved.
Currently, there is a point of view: the existing fire Exterior Insulation construction works most of the fire led to the construction site, and the use of external insulation construction very few cases of fire, to resolve the construction phase to ensure that fire hazards fire safety insulation sex.
In this regard, the experts believe that, from the importance and long-term, the solution used in the process of building a fire hazard is the core of fire safety. He pointed out that the existing insulation in domestic fire works, mostly in the construction process, the process of thermal insulation in building fires, using relatively small. The reason is that the construction process of organic insulation board naked put, without any protective layer, often encountered during construction Hot Cross operation prone to fire. But few people realize, the use of fire in the building when the fire of the poor thermal insulation system can promote the fire.
The expert stressed that the construction site is necessary to improve the importance of fire and be resolved, but resolved to use the process of building fire safety, fire hazard is the core. This is mainly based on two factors: First, when the fire occurred in the construction process involves fewer personnel, buildings flammable, explosive materials less, more channels of escape, rescue difficult small.
The process of building fires using the contrary, in the event of a fire, personnel and property safety and fire rescue capability will face a major test. Second, external insulation construction period is short, generally no more than 3 months, the service life of buildings is usually more than 50 years, therefore, to the importance of safety of persons and property and buildings in terms of long-term use to reduce the building fire damage during use is particularly important.
Myth: only requires a simple structure fire, not to fire classification.
The idea that only the system of organic insulation materials used in more than 24 meters, each increase of one or two layers of a Fire Barrier, to not fire insulation system classification.
In this regard, the experts believe that the ideas are not systematic science. First of all, if only for the Polystyrene Plastered system, although much more than Europe and the United States to relax standards, but at least is "better than nothing," is in operation can be performed. However, if written authoritative standards, this approach too is not the system, unscientific. Because there is no grading standards, test methods, determine the target can not fire all types of insulation systems for system performance evaluation, so that not only can not be a point of order has been included in various types of fire performance of external thermal insulation system and the system effectively evaluation, but not to the future development of exterior insulation system of new research directions and provide a reasonable, effective and systematic evaluation.
Meanwhile, the expert pointed out that the only Fire Barrier Fire can not solve all the problems outside the insulation. First of all fires three times, the occurrence of the most frequent period is the construction phase. This phase usually occurs in the surface layer of fire before the construction, so the flame may be directly attacked by fire separation with surface organic insulation materials and they can cause the spread of fire. Second, the Fire Barrier insulation materials and organic material differences between the surface layer lead to increased risk of fractures, bring new risks, fully mature with the technology needs of fire isolated by large number of experiments to confirm.