Coating construction technology of steel structure
Environmental requirements: environmental temperature should be in accordance with the requirements of coating product specification, when product specifications without the requirement, environment temperature should be between 5 to 38 degrees Celsius, relative humidity should be less than 85%; the coating component surface without dew, moisture etc.; coating within 4 hours after the protection from the rain.
Requirements for design or construction of steel structures prohibit coating parts to prevent accidental coating. Protection must be made before painting. Such as the anchor bolt and the bottom plate, high strength bolt joint surface, and the concrete close to or buried parts.
The paint should shake well before opening the bucket. After opening, the original paint should not exist crust, agglomerate, gel and other phenomena, should be able to stir up sediment, there should be to get rid of the paint.
In the process of coating construction, should paint control the viscosity, density, rare, the system should be fully covered by mixing, paint color, viscosity uniform. Adjustment of viscosity must use a special diluent, if required to be replaced, must be tested.
Besmear brushs number and thickness of coating should perform design requirements; coating interval time is determined according to the various coating products instructions; the first layer of primer brushing, brushing direction should be consistent with neat cha.
After the steel structure is installed, anticorrosive coating is applied second times. Before the coating, the surface treatment of steel wire brush clean using emery cloth, electric, air compressor and other tools, and then the damage to the coating part and non coated parts of the coating, the last two times in accordance with the design requirements of coating construction.
Upon completion of the coating, check and record professionally and professionally. When the coating is defective, it should analyze and determine the cause of the defect and repair it in time. The methods and requirements of the patch are the same as those for the formal coating.
Component after coating, should be temporary enclosure isolation, to prevent damage to the coating; don't trample, and contact with the acid liquid, prevent the bite of coating; to transport, to prevent damage to the coating bump, drag.
During the course of transportation, storage and installation, the damaged coating shall be repaired. In general, factory production after besmear again primer, primer, paint and other intermediate paint at the installation site before lifting the painting, painting in the last finish shall be installed; also the installation and production units in the production units to complete the consultation, primer, intermediate paint coating, but the final finish once again by the finally complete the installation unit. In either case, the coating on the damage and the installation and connection shall be covered. The number of coating times and requirements should be the same as the original coating.
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