It is stipulated that the fire protection requirements for external wall insulation will be determined in accordance with laws, regulations and regulations applicable to the final use of buildings, and will be specified in the CEN classification document (prEN13501-1). In Germany, there are related regulations for the fire safety of polystyrene board thin plastering system that cannot meet the requirements and can not be used in buildings above 22 meters. In the UK, buildings with more than 18ra are not allowed to use polystyrene board thin plastering exterior insulation system. Regulation: The polystyrene board thin plaster exterior insulation system specified in the New York State Building Directive with a fire limit of less than two hours is not allowed to be used in residential buildings above 75 feet, or 22.86 meters. see. Therefore, the external wall insulation system composed of non-combustible materials such as rock wool is widely used in any type of building, and it has become one of the most widely used exterior wall insulation methods in the world.
The status quo of domestic and foreign thermal insulation and fire protection technology at home and abroad The research and attention of domestic external wall thermal insulation fire protection technology is far from enough. At present, there is no fire protection design specification for external wall insulation design. The external wall insulation system lacks grading standards and scope of use. The external wall insulation and fire prevention technology also has no national or industry standards and relevant technical specifications. The manufacturer's product specifications also lack fire resistance indicators, and the famous foreign companies that enter China's external thermal insulation. Also avoided the fire problem. Different from foreign countries, China's buildings are mostly middle and high-rise buildings. It is difficult to rescue when the fire occurs, and the fire protection technology for the building's comprehensive fire prevention technology, especially the external wall insulation is higher.
In addition, the current polystyrene board thin plastering exterior wall insulation system which has a dominant position in China has the following phenomena: As mentioned above, the polystyrene board thin plastering exterior wall insulation system is used in foreign developed countries due to the requirements of building fire protection. There are restrictions, but there are no regulations or standards in the country. Almost all of polystyrene plastered exterior walls of fire hazards blind to the polystyrene plastered exterior insulation system of practices, after some of the world's leading exterior insulation company to enter the Chinese market did not show the life of society, to the people The responsibility of the property shall be based on the current situation of non-standard external wall insulation market, ignoring the regulations of the country where it is concerned that the fire safety is not up to the requirements, and the scope of use of the practice is limited. The use of flammable polystyrene board thin plastering exterior insulation system is concealed and is irresponsible for the technical fraud of the Chinese building energy-saving market. It requires the attention of relevant domestic departments.
The external wall insulation method of polystyrene board and thin plastering grid cloth tiling on domestic high-rise and even super-layer buildings is also quite common. The danger of this method is that: in the event of fire, not only the organic insulation board is released when it burns. The toxic gases and flames pose a great danger to the escapers, and the heat-melting deformation of the polystyrene board is likely to cause the tiles to fall and injure escapers and rescuers. The potential danger is also quite fatal.
At the same time, there is no application of fire isolation isolation technology in the current domestic building exterior wall insulation construction technology system. It is precisely because of the neglect of the fire prevention problem during the external insulation construction process and after the completion of the construction, the cases of fires caused by the flammable exterior insulation materials are everywhere. For example, in September 2003, a Beijing construction site fire (see); April 2004 Beijing construction site of a building due to welding work on Mars splashed floor frame bottom plate of benzene, benzene board ignited fires caused by: in December 2005, a construction site in the Shanghai real estate price, when due to illegal construction workers cut produce sparks ignited the fire 当代万国城 Dongzhimen foam board caused the fire scene (006 in February Beijing moving - back exterior wall of a safety net projections fires, welding sparks ignited insulation material then ignited fence caused by green insulation materials floor surface fires burned parts of the base; between 2006 May 31 wall decoration materials with a layer of the wall in Jiangsu insulation materials fire burning, the fire quickly spread to the entire 20th floor of the fire caused by the external wall.
4. Looking at the current domestic and even high-rise buildings, mostly ultra-high-rise, the main insulation material insulation system for about 80% of organic flammable insulation under the present system polystyrene board thin plaster exterior insulation system mainly, how Improving the safety of multi-storey buildings, high-rise buildings, buildings with high fire protection requirements, etc. is an important issue that is currently related to the safety of people's livelihood.
First of all, through the reference to foreign advanced technology and independent innovation based on national conditions, it is necessary to develop an external thermal insulation system with independent intellectual property rights that can completely solve the defects of fire resistance of most existing external thermal insulation systems. At the same time, it is urgent to establish fire-fighting standards and specifications that are suitable for China's national conditions. It is safe to use and limit the use of external thermal insulation systems with poor fire performance. Pay particular attention to the restrictions on the use of high-rise and super-high-rise exterior walls, and encourage the promotion of safety factors. The external thermal insulation system of the external wall reduces the hidden dangers of fire, reduces the promotion effect of the external wall insulation system on the fire when the fire occurs, further standardizes the external thermal insulation market, and gradually reaches and exceeds the fireproof technical level of the external thermal insulation of the outer wall of developed countries.
(Finish)
Shackles are also required by national standards. Specification documents are given for their technical parameters such as thread size and ring diameter. This is very necessary. If there is no standard to regulate it, then its ring diameter will be made by someone. The result is that the lifting weight is not enough, which is prone to accidents. Let's look at the picture above. The shaft below it can be unscrewed. After putting on the wire rope, tighten the shaft to fix the wire rope inside. Otherwise, a circle of wire rope cannot be hooked. live it up.
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