The membrane structure can be said that it has broken the traditional architectural style of the boring form, is a new building structure form in twenty-first Century with its unique surface has simple shape, generous, just and perfect combination of soft, beautiful and beautiful, give us a find everything fresh and new feeling. However, the new film structure in the form of the traditional building fire safety design concept put forward a new concept, its unique combination of space division, in the fire evacuation distance determination and so on are beyond the current specification. Therefore, from the overall safety of the building to consider, reasonable and flexible selection of fire prevention measures to ensure the safety of membrane structure building fire.
As a flame retardant polyester fiber, polyester fiber coated with PVC membrane materials all have passed the flame test, remove heat, membranes can quickly extinguish. When the temperature reaches about 70 degrees, the film will creep. When the temperature exceeds 100 degrees, the welding seam between the bars will crack and the material will melt at about 250 degrees centigrade. The partial open flame will burn holes on the surface of the film. Once the fire source is not in direct contact with the film surface, the flame at the entrance of the hole will extinguish itself. The PVC coating contains additives that prevent flames from splashing around. Most glass fiber basal lamina materials are nonflammable materials. When the temperature reaches 100 degrees centigrade, the film material will not fire, and the welding seam of PTFE coated glass fiber film will be destroyed when the temperature is above 250 degrees centigrade.
PTFE high temperature combustion produces toxic smoke, PVDF/PVF/Acrylic high temperature combustion can produce smoke and dust, Silicone is pure combustion, does not produce poisonous gas.
The membrane structure shall be made of different membrane materials according to fire protection requirements. Generally speaking, fire resistance is directly related to the price of materials. Non combustible film material shall be used whenever possible. The fire protection design of membrane structure is not only carried out on the surface of membrane materials coated with polyester fiber fire prevention measures, but also can be carried out skeleton structure fire prevention treatment. The entire membrane structure building has a fireproof property. If it is to be used as a permanent building, the flame retardant film shall be taken according to the requirements of the local fire department.
Before the coating of the membrane structure skeleton fire retardant coating, the surface rust removal and antirust primer coating of the steel structure parts shall comply with the design requirements and the current relevant state regulations and regulations, and the dust, oil pollution and other sundries on the surface of the steel member shall be thoroughly removed. Fire retardant coatings for steel structures shall be prepared before interior decoration and without subsequent damage to the project. During construction, shelter walls, doors and windows, machinery, equipment and other components that do not need fire protection shall be sheltered.
Brush the steel structure interface agent before spraying. After the interface agent is dried, spray or smear coating is applied. Before coating, according to, according to powder: emulsion =1:1 proportion of mixing, mixing evenly, so that it is no caking, thick fluid state. The consistency should be determined according to the coating method, so as to facilitate construction, not flowing and firm bonding. For super wide large steel should be added to steel net, to prevent the omission or separation coating. When spraying, we use a concave and convex spray gun, the air pressure is 0.6 ~ 0.8MPa, and the diameter of the lance should be 6 ~ 10mm. The spray gun is perpendicular to the surface of the painted component, and should be from 40 to 60cm. Spraying construction the first time is not too thick, after dry, and then the next construction, in order not to flow is appropriate, until the standard thickness.