The necessity of steel structure fireproof coating!

We live in a common city, our city is developing rapidly, more and more large-scale buildings such as exhibition halls, terminals, large shopping malls and high-end hotels and industrial plants, such as increasing, the use of steel construction is also increasing, steel structure fire prevention problems are increasingly prominent, can not be avoided.
Below we will chat together, steel structure fire prevention issues
modern steel structure plant building characteristics
degrees of pre-engineering, construction costs reduced, shorten the duration of the
steel structure plant building module coordination and unified standards to achieve large-scale production of building industrialization, improve building pre-engineering, so that different materials, different shapes and different manufacturing methods of building components have a certain degree of versatility and interchangeability. At the same time, the pre-engineering of steel structure plant building makes the material processing and installation integration, greatly reduces the construction cost, and accelerates the construction speed, so that the construction period can be shortened by more than 40%, so that the building can be put into use earlier .The design and function of
-degree architecture and structure are integrated to make the building more functional
in the steel structure plant building, the structure becomes an important factor in the image composition, the shape of the structure, the components, the nodes from a large extent lead to and restrict the image of the building. The design and function of architecture and structure can only be integrated to make the building more functional so that the subsequent design links continue to create a steel structure building that integrates technology and art.
-degree steel structure plant building can meet the requirements of ultra-height and ultra-span
steel tissue is uniform, close to the homogeneity of the same sex, high strength, high elastic module. The ratio of density to strength is much smaller than that of masonry, concrete, wood, steel structure plant weight is small under the same force conditions, so that it can be made into a larger span and higher height structure and flexible structure.
materials can be recycled, contribute to environmental protection and sustainable development
the fire risk of steel structure plant buildings
1, the rapid development of the fire, easy to form a large area of combustion.
Steel structure span is large, the building interior space is large, doors and windows, air circulation is fast, there is no obvious fire separation inside, once a fire, spread more ways, the rapid development of the fire, burning, it is easy to form a large area of fire under the role of strong conflow. The main factor of fire risk in large span steel structure plant is that some construction projects have not been approved and accepted by fire.
2, steel structure building fire resistance is poor, easy to collapse.
steel structure material does not burn on its own without fire protection treatment, but the strength decreases rapidly in the event of a fire. According to the test, under full load conditions, the critical temperature of the steel structure to lose static equilibrium stability is about 500 degrees, while the general fire temperature can reach 800-1000 degrees. At such a high temperature, the exposed steel structure will soon appear deformed, causing local damage, resulting in the overall collapse of the steel structure. Ordinary steel structure plant generally in the fire after about 15 minutes will lose the load-bearing function and collapse, such as Jinhua Jiangnan Development Zone Dafeilong Pharmaceutical Co. , Ltd. steel structure warehouse fire, less than 20 minutes after the fire in the middle of the fierce steel frame collapsed.
3, rescue difficulties.
large-span steel structure building fire, the fire quickly developed to a violent stage, in the implementation of fire extinguishing, due to the plant span, coupled with more internal equipment, complex layout, directly hindering firefighters to deep internal attack, the general water gun jet is difficult to reach the fire point, fire extinguishing agent use efficiency is poor. And in the fight against steel structure building fire, the commander has a "collapse" of fear, which will have an impact on the formation of combat determination, the choice of offensive routes. The steel structure fire in the fire fighting due to the impact of water gun flow cooling effect, so that the collapse of the curved steel structure component strength is reduced, resulting in fire after-fire clean-up difficulties, fire fighting difficulty and workload increased. Collapse bending steel structure components due to large size, weight, cleaning needs large-scale mechanical work, to a certain extent, also reduce the progress of fire accident investigation.
the fire protection method of steel structure plant
Generally using fire-resistant coating coating or sprayed on the steel surface, forming a fire-resistant thermal protection layer, improve the fire resistance limit of steel structure. This method is simple to construct, light in weight, has a long fire resistance time, and is not limited by the geometry of steel components. It has better economy and practicality and is widely used. There are many varieties of steel structure fire protection coatings, which are generally divided into two categories: one is expansion steel structure fire protection coatings, and the other is non-expansion steel structure fire protection coatings. Expansion-type steel structure fire-resistant paint, has a certain decorative effect, high temperature expansion thickening. Fire resistance limits can range from 0.5 to 2.0h. Expansion steel structure fire-resistant coating coating is thin, light weight, good earthquake resistance, when the fire resistance limit is set at 2.0h and below, it is appropriate to choose expansion steel structure fire-resistant coating. Non-expansion steel structure fire-resistant coating thickness is generally 15 to 50mm, grainy surface. The main components are inorgestring insulation materials with low density and low thermal conductivity. Fire resistance limits can range from 0.5 to 3.0h. Non-expansion steel structure fire-resistant coatings are generally non-combustible, anti-aging, durability is more reliable, when the fire resistance limit is set at more than 2.0h, non-expansion steel structure fire-resistant coatings should be used.