Coating technology: Construction Technology of tunnel fire retardant coating

Core tip: the construction of tunnel fire retardant coating generally adopts layered and interval coating construction technology, which is divided into base (fire layer) and surface (color layer) construction During the construction of fire retardant coating and within 24 hours after the construction, the ambient temperature shall not be lower than 4 ℃ to prevent frostbite Under extremely dry and hot conditions, necessary curing conditions shall be created to prevent the water loss of fire retardant coating from being too fast 1 Construction machines and tools: mortar mixer, special spraying equipment (squeeze mortar pump, air compressor), special iron plate for plastering, cleaning tools, transportation tools, etc 2 Construction preparation: (1) The Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Coating House News: the construction of tunnel fire-retardant coating generally adopts layered and interval coating construction technology, which is divided into base (fire-retardant layer) and surface (color layer) construction During the construction of fire retardant coating and within 24 hours after the construction, the ambient temperature shall not be lower than 4 ℃ to prevent frostbite Under extremely dry and hot conditions, necessary curing conditions shall be created to prevent the water loss of fire retardant coating from being too fast 1 Construction machines and tools: mortar mixer, special spraying equipment (squeeze mortar pump, air compressor), special iron plate for plastering, cleaning tools, transportation tools, etc 2 Construction preparation: (1) clean the floating dust and oil on the concrete surface of the tunnel, and spray water to wet it; (2) repair the uneven areas to ensure the flatness of the concrete surface of the tunnel; at the same time, for the particularly smooth areas of the concrete surface, it is required to use mortar to plaster; (3) the leakage and water stop must be made up at the leakage area 3 Base construction: (1) mix water and paint in the proportion of (0.70-0.75): 1, mix with mixer for 20min (make sure that the mixing time is ensured, and the paint is mixed with time) to form thick slurry; (2) use a small amount of slurry as the horizontal strip thickness mark with a spacing of 2.5m as the reference for spraying construction; (3) Spray from the waist of the tunnel to the top (from the bottom to the top) with a spraying machine, with a spraying thickness of 3-8mm each time; (4) after the first spraying is basically dry, continue to spray for the second time, so cycle until the spraying reaches the design thickness; (5) As the spraying surface is not smooth enough, it is necessary to fill, level and trim the coating surface with slurry immediately after the last spraying, so as to make the coating surface flat and smooth and ensure that the coating reaches the design thickness; (6) after the completion of the base course, the coating surface is required to be flat, smooth and clean 4 Surface construction: the surface construction can only be carried out after the base course is basically dry and fully formed (about 3D is required) (for projects with higher requirements, it is better to apply a layer of putty on the surface of the base course before the surface construction) The surface layer can be constructed with spray gun, wool brush, roller and other machines and tools, and the spraying shall be uniform, smooth and without color difference The boundaries of different colors shall be straight and clear 5 Construction precautions: (1) the surface of concrete structure shall be thoroughly cleaned and free of dirt and oil (2) The construction operation shall be carried out in a well ventilated indoor environment to avoid rain The construction ambient temperature shall be ≥ 5 ℃, and the relative temperature shall be ≤ 90% RH (3) If the prepared coating is not used up on the same day, the remaining coating shall not be reused (4) The curing period is 30 days after the completion of the fire-resistant performance test and 21 days after the completion of the rational energy test Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,