The hottest Huang Zhenli carries out fire classifi

2022-08-24
  • Detail

Huang Zhenli: combined with the national conditions, we have carried out fire classification of external insulation materials

we have just done four groups of tests in two weeks, and found that even if the polyurethane surface is plastered with 3-5mm cement mortar on the controller as the core of the control system, the fire resistance performance is still very limited. " Lu Guojian is the deputy director of the Sichuan Fire Research Institute of the Ministry of public security. He is leading the team to study the fire prevention code of high-rise buildings. Hearing the fire on Jiaozhou Road in Shanghai, Lu Guojian told that the external thermal insulation material is the material in urgent need of standardized management. "Exterior wall thermal insulation materials are now our research focus. In the past, fires spread from the inside to the outside, and in recent years, there have been examples of fires burning from the outside to the inside. On the one hand, some national departments have promoted exterior wall thermal insulation and energy-saving materials in recent years, and the project has developed rapidly, but many materials are easy. The burning of exterior walls breaks the concept of independent fire zones inside the floor. There are also rainsheds extending out of residents' homes, which will also burn in case of fire Become a channel for flame to spread from the outside. In the past, when we considered the fire prevention code, we thought of a building as four planes, but in fact, there are many sunken parts in the tower building, forming a chimney effect in case of fire

luguojian said that foamed plastics can also be treated as non combustible, but the cost should be much higher. The pursuit of low cost and the lack of relevant specifications are the main reasons for similar fires

Huang Zhenli, chairman of Beijing Zhenli energy conservation and Environmental Protection Technology Co., Ltd., together with experts from the Institute of fire prevention of the Chinese Academy of Building Sciences, once summarized in detail several cases of external insulation fires in recent years after the CCTV new building fire, and proposed that fire rating should be added to standards such as the following three common problems outside the external wall: technical code for insulation engineering

according to Huang Zhenli's research, the idea of relevant European and American standards and specifications is to classify the combustibility of thermal insulation materials and the combustibility of thermal insulation systems. Different systems are applied to buildings with different fire ratings. They basically stipulate that the external insulation system of non combustible insulation materials can be used from more than 22 meters to less than 22 meters, and the external insulation system of combustible materials can be used below 22 meters. Even when it is used below 22 meters, when the thickness of polystyrene board is relatively thick (such as more than 100mm in Germany), or when higher requirements are put forward for fire prevention, certain structural fire prevention measures should be taken, such as using non combustible materials, making fire prevention structures in door windows, and setting fire separation belts

at present, organic combustible insulation materials (EPS, XPS, PU, etc.) are widely used in wall insulation in China, and there is a great lack of qualified non combustible insulation materials such as mineral (rock) cotton board. However, due to the particularity of national conditions, it can not be simply classified and standardized according to European and American standards. At present, most buildings in China are medium and high-rise buildings. If the organic insulation material system is limited to less than 22 meters in full accordance with the standards and specifications of European and American countries, it will cause a serious surplus of organic insulation materials and insufficient supply of non combustible insulation materials, which will seriously affect the promotion of domestic building energy-saving measures. Huang Zhenli and other experts believe that fire prevention classification of external thermal insulation materials should be carried out in combination with the specific situation of China

from the perspective of the harmfulness of external insulation fire, when organic insulation materials are burned, the combustion temperature of polystyrene can reach more than 1000 degrees Celsius. When the external insulation fires and attacks the room through the window, the high-temperature flame and its thermal radiation can kill people in a short time. In case of fire in the external insulation, if the polystyrene board is adhered to the point frame, the space between the inner side of the plastering layer and the wall base can be regarded as a closed space. This Japanese company, who does not want to reveal its name, is mainly engaged in plastic processing and composite material production. When local polystyrene boards burn and transmit hot gas through the cavity, it is easier to reach the critical point of flashover, and then all the polystyrene boards inside the insulation layer burn

organic thermal insulation materials are flammable materials, which will consume a lot of oxygen in the air when burning. Usually, when the external insulation fire attacks the room through the window, it will consume indoor oxygen and cause oxygen suffocation. The combustion of organic thermal insulation materials will produce more smoke. Statistical analysis shows that 80% of the deaths in fire and the number of researchers on the key performance indicators of modified traditional carbon materials are caused by smoke

note: the reprinted content is indicated with the source. The reprint is for the purpose of transmitting more information, and does not mean to agree with its views or confirm the authenticity of its content

Copyright © 2011 JIN SHI