Fire protection of seamless tube
Date:2018-05-25 View:388 Tag:Fire protection of seamless tube
The seamless tube usually loses its bearing capacity at 450-650 degree C and experiences great deformation, resulting in bending of steel columns and steel beams. Therefore, they can not continue to use because of over deformation. Generally speaking, the fire resistance of unprotected seamless pipe is about 15 minutes. The length of time is also related to the heat absorption rate of the component. The following are several different fire prevention measures for seamless steel tubes.
1, the outer layer. It is the appearance of seamless tube cladding, which can be poured and molded, and can also be used by spraying. The cast-in-place solid concrete overlay is reinforced by steel mesh or reinforcing steel bars to constrain shrinkage cracks and ensure the strength of the shell. Construction site spraying construction seamless tube surface construction sand pump to form a protective layer, sand pump can be used lime cement or gypsum mortar, or perlite or asbestos mixed use. At the same time, the outer layer can also be made of pearlite, asbestos, gypsum or asbestos cement, lightweight concrete made from prefabricated plates, and fixed on the seamless pipe with adhesives, nails and bolts.
2, water. Hollow seamless pipes filled with water are designed to resist the most effective fire prevention measures. This method can keep the seamless tube at low temperature in the fire, and the water circulation in the seamless tube absorbs the heat of the material itself. Heated water can be recirculated after cooling, or cold water can be introduced into the pipeline to replace heated water.
3, shielding. Seamless tubes are installed on fire resistant walls or ceilings, or hide the two wall components in crevice, as long as they add a little refractory material or fail to achieve fire protection purposes. This is one of the most economical methods of fire prevention.
4, the expansion of the material. Using the components of the seamless pipe fire retardant coating, this method has good fire protection and heat insulation, the construction of geometric constraint seamless tube and so on, generally do not need to increase auxiliary facilities, and the weight of the paint is light, there are some beautiful decoration. The role of modern advanced fire safety technology and measures.
At present, the construction quantity of seamless steel tube is increasing continuously, especially in some super high-rise buildings, the use of seamless pipes is more extensive. When a fire occurs in a high-rise building, the fire will not disappear in a short time. This requires us to increase the fire protection of building materials in architectural design in order to improve their fire resistance and to formulate necessary emergency plans to reduce casualties and property losses.