Copyright ©2018 www.g.xmzhenfa.cn All Right Reserved. 豫ICP备07006620号-1
Xinmi Zhenfa Refractory Co., Ltd.
Add: Industrial Zone, Mi Village Town, Xinmi City
Phone：+86-13703900859 / +86-18003867879
We chat number
Why does the exterior insulation material always cause a fire?
At present, building exterior wall insulation materials are one of the important items for sampling inspection of interior decoration materials, which is not unrelated to frequent fire accidents. For example, the CCTV building fire was caused by the use of organic insulation materials that are not flame retardant. These materials produce more smoke and toxic gases due to incomplete combustion and pyrolysis in the event of a fire, and most people in fire accidents are inhaled by smoke and toxic gases. Therefore, the fire risk caused by the building exterior wall insulation material is extremely high, which is likely to cause major casualties. The author combines the work experience to talk about the cause of the fire and the countermeasures against it. First, the analysis of the cause of fire on the external wall insulation materials First, the industry standards are not perfect, the product quality is uneven. At present, the production and use of external thermal insulation materials are disorderly. The organic thermal insulation materials currently used in the construction field mainly include polystyrene board (EPS), extruded board (XPS) and polyurethane (PU). The biggest advantage is that Light weight, heat preservation and good heat insulation. The biggest drawback is poor fire safety, aging and easy burning. The former two are widely used because of their low price, and the latter is slightly superior in terms of thermal conductivity, construction performance and combustion performance. The industry standard for exterior wall insulation materials is still not perfect. Some manufacturers have loopholes in management. The external insulation materials produced cannot meet the requirements of building fire protection design. The fire resistance grade and fire resistance limit also fail to meet the national standard. After the market, buried congenital safety hazards for building fire accidents. Second, the construction period is long, and the hidden dangers on the job site are clustered. For the construction industry, energy-saving insulation is a national policy, and wall insulation is an important means to achieve building energy conservation, so the application of building insulation materials is very extensive. In reality, the construction period of high-rise buildings, large stadiums and other buildings is generally two to three years, and various construction processes cross each other and management is inconvenient. Individual management personnel neglected the investigation and rectification of on-site fire hazards and the provision of temporary fire water, and put all their energy into catching up the construction period and compressing the cost.
During the long period of two to three years, there are many flammable materials on the job site, which makes the fire hazard difficult to be discovered in time. The external wall insulation material has the characteristics of extremely fast spreading speed, insidious combustion, and difficult control after a fire. It is easy to cause significant personnel and property losses due to on-the-spot personnel. Third, the cost of qualified materials is high, and the construction units are shoddy. Ji Guangqi, a researcher at the Institute of Building Fire Protection of the China Academy of Building Research, said in CCTV's "Building Insulation Material Flammable and Worrying" program: "In fact, many insulation materials are now seen, whether it is polystyrene or hard foam insulation. Paper is not up to standard, that is, B3 pole, are all flammable materials. Basically, it is easy to cause fire. In the case of extruded board, the price of fireproof standard is higher than that of flammable extruded board. More than doubled." The current insulation materials are divided into four levels: non-combustible, B1 (flammable), B2 (combustible), and B3 (flammable). There are two types of inorganic insulation materials and organic insulation materials. The former is characterized by Non-combustible, but the insulation effect is poor, only about 20% of the market share, the latter characteristic is good insulation effect, but easy to burn, occupying 80% of the market, for this, it is necessary to add a certain amount of flame retardant to the material to make it To achieve the standard, and the flame retardant is expensive, many merchants add less flame retardant in order to maximize profits, and some do not even add. Individual construction units deliberately purchase inferior thermal insulation materials, shoddy, cost-saving, and fire supervision is not in place, it is easy to get away with it. Second, the fire prevention measures for exterior wall insulation materials First, to improve the public's awareness of external insulation materials, and to achieve scientific prevention. From the reality, it is impossible for people to negate their use in construction because some of the external insulation materials are flammable. The key is how to use them safely and regularly. If the standard uses external wall insulation materials, increase the supervision of external wall insulation materials, complete fire-fighting measures, and improve safety awareness, most fires caused by external wall insulation materials can be prevented. At present, domestic new construction buildings use a large amount of organic external thermal insulation materials, such as molded polystyrene board, extruded polystyrene board and foamed polyurethane. Their insulation properties are superior to most inorganic materials and are the main building insulation materials.
However, in terms of material properties, they have low ignition points and are flammable. If a large amount of such flammable insulation materials are wrapped in the building, it will inevitably leave a fire hazard to the building. Therefore, the relevant departments must strengthen the fire management of such buildings, and raise the public's scientific understanding of these materials to achieve scientific prevention. Second, strict construction site management on construction sites to eliminate potential safety hazards. According to a domestic statistical report, about 25% of fires involving building insulation materials occur during the storage of insulation materials, 65% occur during the construction of insulation materials, and less than 10% occur during construction. It can be seen that the construction process of building wall insulation is a high-risk period of fire. The regulatory authorities should strengthen the standardized management of the building exterior wall insulation materials manufacturing enterprises, construction enterprises and building insulation materials market, carry out wall insulation system certification work, and introduce licenses and insurance systems to improve the safety of building wall insulation. "When carrying out fire supervision and inspection, the fire department shall convey the awareness of fire prevention to the construction site management personnel, and also require the construction site to ensure that each work surface has a fire water source for self-rescue in the event of fire. Only strict construction On-site management can minimize the fire safety hazards. The third is to update and improve all kinds of fire-fighting and rescue equipment and equipment to improve the ability to attack. At present, the speed of China's fire-fighting equipment "long high" can not keep up with the speed of building "long".
According to statistics, in recent years, there have been more than 100 super high-rise buildings in China, and a number of them are under construction. Combined with the high-rise building exterior wall insulation material fire has the characteristics of great destructive power, great difficulty in fighting, and fire propagation path. The fire department can consciously add turbojet fire engines and high-spray fire protection according to the actual situation of government fire protection planning and regional economic development. Vehicles and ladder fire trucks use high-end high-equity equipment to improve the emergency rescue and attack capabilities of fire-fighting units, so as to quickly extinguish fires on external wall insulation materials and prevent the occurrence of group deaths. In short, the extensive use of building exterior insulation materials makes the building fire prevention problem both consider the fire inside the building and the external fire protection of the building. Only by carefully drawing lessons from relevant domestic fire accidents, recognizing the root causes of fires caused by external wall insulation materials, and adopting effective measures, the city's fire safety will have a foundation, and people's lives and property safety can be guaranteed.