Seamless steel tubes usually lose their load carrying capacity at temperatures of 450 to 650 °C, causing large deformations, resulting in bending of steel columns and steel beams. As a result, they ca…

Seamless steel tubes usually lose their load carrying capacity at temperatures of 450 to 650 °C, causing large deformations, resulting in bending of steel columns and steel beams. As a result, they cannot be used due to excessive deformation. Generally the fire resistance limit of unprotected seamless steel tubes is about 15 minutes. The length of this time is also related to the speed at which the component absorbs heat.

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1. Outsourcing layer. It is to add an outer layer on the outer surface of the seamless steel pipe, which can be cast in place or sprayed. The cast-in-place solid concrete cladding is usually reinforced with steel mesh or steel to limit shrinkage cracks and to ensure the strength of the outer casing. The spraying method can apply a sand pump to the surface of the seamless steel pipe at the construction site to form a protective layer. The sand pump can be lime cement or gypsum mortar, or can be mixed with perlite or asbestos. At the same time, the outer layer can also be made of perlite, asbestos, gypsum or asbestos cement, light concrete, and fixed on the seamless steel pipe with adhesive, nails and bolts.

2, Filled with water. Filling the hollow seamless steel pipe is the most effective protection against fire. This method enables the seamless steel pipe to maintain a lower temperature in the fire, and the water circulates in the seamless steel pipe to absorb the heat of the material itself. The heated water can be recirculated after cooling, or cold water can be introduced from the pipeline to replace the heated water.

3. Shielded. The seamless steel pipe is placed in the wall or ceiling of the refractory material, or the component is hidden in the space between the two walls, and the fireproofing purpose can be achieved by adding a little refractory material or increasing it. This is the most economical way to fire.

4. Expanded materials. It adopts seamless steel pipe fireproof coating protection component. This method has the advantages of good fireproof and heat insulation performance, construction is not restricted by the geometric shape of seamless steel pipe, and generally does not need to add auxiliary facilities, and the coating quality is light, and there is certain aesthetic decoration. Function, belonging to modern advanced fire prevention technical measures.

At present, high-rise seamless steel pipe construction is increasing, especially for some super high-rise buildings, which use a wider range of seamless steel pipe materials. In the event of a fire accident in a high-rise buildingFind Article, the fire will not be extinguished in a short period of time. This requires us to increase the fire protection of the building materials during the design of the building to enhance its fire resistance and to develop the necessary emergency within the building. Program to reduce casualties and property damage.

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