With the rapid development of my country’s economy, the status of factories has increased, which directly drives the construction of industrial factories in various places. Among them, there are beautiful shapes, bright colors, diverse architectural forms, low cost, convenient installation, reasonable structure, reasonable structure, low cost, compact structure, compact structure, compact structure, compact structure, compact structure, compact structure, structural structure, structural structure There are many advantages such as simple, recyclable, and other advantages. But there is also a fatal disadvantage of the room, which is not refractory. Although steel is not burning, under the influence of high temperature of the bright fire, as the temperature rises, the mechanical indicators will change greatly, and the bearing capacity and balance stability will be greatly reduced with the increase in temperature. Around 500 ° C, the decrease is more obvious, and it will collapse in about 15 minutes.
Therefore, protective measures for building factories. First, fire protection protection of the steel structure itself, it will not quickly exceed the critical temperature when the fire temperature rises. During the prescribed time, the steel structure can also ensure stability within a certain period of time and ensure the safety of personnel and property; the second is to set up effective fire prevention partitions inside the industrial plant to prevent the fire spread and spread.
Fire protection of steel components.
The refractory limit of the steel component itself does not meet the requirements of the specifications, so it is necessary to take corresponding fire prevention measures for steel components. Common fire protection measures include fireproof coatings, foam fireproof coatings, and outsourcing fire layer methods.
1. Painting method.
The flame retardant method is to spray fireproof coatings on the surface of the steel structure to improve its fire resistance. At present, my country’s coatings are mainly divided into two types: thin and thick coating, namely thin (including ultra -thin) and thick (H levels). The thickness of the thin coating is less than 7 mm. When it is on fire, it can suck the heat and expand foam, forming a foam carbon insulation layer to prevent the heat from being transmitted to the steel structure, delay the rising steel temperature, and play a role in fire protection. Its main advantage is: thin coating, light load for steel structure, good decoration, and the coating on the surface of the steel structure of small areas and complex shapes is easier than thickness; thick coating thickness is 8-50mm, thick coating coating The thickness is 8-50mm, and the coating is not foamed. It relies on its lower thermal conductivity to delay the increase in the temperature of the steel structure, thereby playing a role in fire protection. The performance characteristics of the two are different, suitable for different occasions. However, no matter which product, it must be tested by the testing agency to choose from.
The second is paint foam.
Foam fireproof coatings are flame retardant coatings made of various membrane -formants, flame retardants, foaming agents and other materials. Compared with general coatings, flame retardant coatings are basically the same in physical properties. The difference is that the paint film itself is not flawed after drying. When the fire occurs, the flame can be extended to the flammable material of the paint and has a certain fire resistance. Test: Apply ordinary coatings to wooden boards, apply fireproof coatings, dry after drying, bake with the same flame, coat the wooden board with ordinary coatings, and apply it in less than 2 minutes. After 2 minutes, only the phenomenon of yin combustion occurs, and it goes off after 30 seconds; the wooden board with expansion and fire prevention will not appear even if it is baked for 15 minutes. Therefore, applying fire coatings on the surface of the object can prevent the fire from spreading within a certain period of time to protect the surface of the object, thereby providing valuable time for fire extinguishing.
3. Outsourcing fireproof method.
Outsourcing thermal layer method is to increase the outer layer on the surface of the steel structure, which can be poured. The existing coagulation coagulation and casting outer bag are generally reinforced by steel wire mesh or steel bar to limit the contraction cracks to ensure the strength of the shell. Spray lime cement or gypsum mortar on the surface of the steel structure at the construction site to form a protective layer, and it can also be mixed with perlite or asbestos. Outsourcing can also be made of pre -made boards with perlite, asbestos, gypsum or asbestos cement, and light concrete, and fixed on the steel structure through adhesives, nails, bolts, etc.
The fire zone refers to the local area divided by fireproof separation measures, which can prevent the fire from spreading to other parts of the same building within a certain period of time. By dividing the fireproof partition in the building, the fire can be effectively controlled within a certain range, reducing the loss of fire, and providing favorable conditions for the safety evacuation and fire extinguishing of personnel. Common fire prevention partition methods include firewalls and independent water curtains, but due to the particularity of industrial plants, both methods have certain defects.
In civil buildings, the firewall is usually used to separate the plant to control the spread of fire. However, in the industrial plant, not only the large space in the plant is divided into its breathability, but it is also not conducive to production management from the continuity requirements of the production process and the logistics organization in the workshop.
2. Independent water curtain.
The water curtain can play a role in the firewall. It is a good solution to separate the fire protection by independent water curtain. The water spraying method of fire -resistant water curtain should be sprayed or rainy water curtain. The layout of the water curtain nozzle shall not be less than 3 rows, and the width of the water curtain formed by the fire curtain shabu should not be less than 5m. This is a flexible boundary method. Unlike the firewall, the theoretical span is not like the firewall. In general, there seems to be no fire. Once the fire occurs, the fire separation is required, and an effective separation can be achieved immediately. However, there are also disadvantages to do fireproof partitions in separate water curtains: first, water requires water; secondly, only a few fire extinguishers are needed to solve the problem where fire extinguishers occur in the factory. At this time, if the water curtain starts, it will damage the production equipment, causing greater losses than local fires. Therefore, it is necessary to strictly control the start time of the water curtain to prevent errors, so it is more appropriate to use manual startup; in addition, effective maintenance is also troublesome.
In short, the current fire protection and fire protection division of buildings are more commonly used. However, due to the needs of industrial plant production, various methods cannot be achieved well. In practice, we need to continue to explore to find better fire prevention measures and guarantee the property safety of personnel on hardware.
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