Characteristics and construction technology of thick steel structure fireproof coating

When the thick steel structure fireproof coating is sprayed on the surface of the steel component, it will form a fireproof and thermal insulation layer by the non-combustibility and low thermal conductivity of the coating itself in case of fire, and the fire will directly invade the bearing member, thereby effectively improving the fire resistance of the steel structure. limit. Because the thick steel structure fireproof coating has non-corrosive steel, does not react with any anti-corrosive primer, has no irritating odor, the coating quality is light (the structural load is relatively light), the unit coating area is large, and it does not occur in case of fire. It is suitable for fireproof coating and fire protection of steel structural load-bearing members in various industrial, civil and civil construction projects of new construction, expansion and reconstruction.

Construction technology of thick steel structure fireproof coating

1. Before the fireproof coating is applied, the surface of the steel component should be rust-removed and the rust-proof primer should meet the design requirements and the relevant national regulations. The dust, oil and other debris on the surface of the steel component should be completely removed.

2. The coating of fireproof coating should be carried out before the interior decoration and without being damaged by the subsequent works. During construction, the walls, doors and windows, machinery and other components that do not require fire protection shall be shielded and protected.

3. Brush the Dongan steel structure interface agent before spraying. After the interface agent is dry, apply it by spraying or smearing. Before coating, mix and mix according to the ratio of powder: emulsion = 1:1, so that it is in a state of no agglomerated thick fluid. The consistency should be determined according to the coating method, so as to facilitate construction, no flow and strong adhesion. For extra-large steel, a steel mesh should be added to prevent the paint from leaking or separating.

4. When painting by spraying, use the bumper type spray gun, the air pressure is 0.6~0.8MPa, and the diameter of the spray gun mouth should be 6~10mm. The spray gun is perpendicular to the surface of the member to be coated, preferably 40 to 60 cm.

5, the first time the spraying construction is not too thick, after the next construction, the next construction, not to flow is appropriate, until the standard thickness is reached.

6. The coating method of applying fireproof coating by smear method is basically the same as the method of smearing cement.  

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