How to properly maintain the steel warehouse workshop?
With the rapid economic development, industrial steel structure workshops are in full swing. The steel warehouse workshop has the advantages of beautiful appearance, bright colors, diverse architectural shapes, low cost, short construction period, high degree of factory production of steel components, simple installation and construction, flexible layout, light weight, uniform materials, convenient design and calculation, and recyclable use, etc. advantage. In modern industrial workshops, it is used by more and more people.
But steel structure buildings also have a fatal flaw, namely fire resistance. Although steel is a non-combustible material, under the action of open flame and high temperature, its mechanical index will change greatly with the increase of temperature, and the bearing capacity and balance stability of steel structure will also greatly increase with the increase of temperature. reduce. The decline is more obvious around 500 minutes, and it collapses due to the loss of bearing capacity at around 15 minutes.
Take protective measures for steel warehouse workshop. First, when the fire temperature rises rapidly, the fire resistance of the steel member itself cannot exceed the critical temperature. The steel structure can ensure the stability of the fire within the specified time and ensure personal and property safety. Secondly, effective fire zones can be set up in the warehouse area to prevent the fire from spreading to other areas.
1. Fire retardant coating method
Fire retardant coating method is to spray fire retardant coating on steel structure to improve its fire resistance. At present, steel structure fireproof coatings are mainly divided into thin coating type and thick coating type, namely thin coating type (B type, including ultra-thin type) and thick coating type (H type). The thin coating is less than 7mm thick, and when the fire is heated, it expands and foams, forming a foam carbonized insulation. It prevents heat transfer to the steel structure, delays the temperature rise of the steel structure, and plays a flame retardant role.
2. Foaming fire retardant coating method
Foam fire retardant coating is a kind of flame retardant coating made of film-forming agent, flame retardant, foaming agent and other materials. Compared with ordinary coatings, fire retardant coatings have the same physical properties. The difference is that the film itself is not easy to burn after drying. When a fire occurs, it can delay the combustion of the flame on the combustible material, and has a certain fire resistance. In the event of a fire, the spread of the fire can be stopped within a specified time, and the surface of the object can be protected, thus taking up valuable fire fighting time.
3. Outsourcing fire protection layer practice
The method of fire prevention is to add a layer of outer coating to the outer surface of the steel structure, which can be cast-in-place or sprayed. In order to limit shrinkage cracks and ensure the strength of the shell, the outer layer of cast-in-place solid concrete is usually reinforced with steel mesh or steel reinforcement. This spraying method can spray lime cement or gypsum mortar on the surface of the steel structure to form a protective layer or add perlite or asbestos. At the same time, the outer layer can also be made of perlite, asbestos, gypsum, asbestos cement and lightweight concrete, fixed to the steel structure with adhesives, nails and bolts.
The fire retardant coating method is a common method for fire protection of steel structure industrial building, but due to the needs of industrial building production, each method has some unsatisfactory places in practical applications. We also need to explore and find better fire protection measures in practice to ensure personal and property safety from hardware.
