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Steel structure building fireproof rank and fire characteristics

Steel color sheet filled insulation materials more for polystyrene foamed plastic core material, rigid polyurethane core material, rock wool, slag cotton core material, etc. Its buildings after steel fire-retardant coating processing, refractory limit can be to achieve the secondary fireproof rank requirement, facades and roof using difficult to burn or non-combustible type sandwich choi steel, theoretically, this architecture of fireproof rank can to achieve the secondary, however in real work is difficult to meet the requirements of caigang composite panels, because it’s hard to fire prevention coating each point of guarantee fire-retardant coating thickness can meet the requirements, in case of fire, by fire weak positions. This site to lose support ability, cause other parts of stress concentration, and make the building damaged. Second, since the manufacturer’s reason, some building facades and roof panels on flame retardant type choi steel, but it’s very difficult to achieve flame retardant requirements.
If the heat insulating materialthe in steel color sheet cannot achieve the heat preservation material within the B1 level requirements,  light steel structure housing with material of steel color sheet once catch  fire , because the fire spreading fastly, combustion products containing large harmful gas, heat preservation material clip in metal material and other reasons, save difficult among easily cause baked wheaten cake joins camp and the accident of dead, injured. Usually, because caigang steel structure building span bigger, length is longer, the interior space big, easy to space, if more, once the fire combustible, the fire spread quickly, can cause serious consequences. In addition, if the outer walls and roof color steel sandwich reach flame retardant degree, fire will through the sandwich choi steel’s sandwich spread quickly, fire water can’t stop its spread, tend to cause serious consequences.