Fire retardant coating construction scheme for steel structure

The construction of fire retardant coating for steel structure is a kind of coating construction method.

According to the requirements of the construction specifications in the "Steel Structure Fire Retardant Coating Product Specification", strict construction operation procedures are required to ensure the quality of construction and create a high-quality construction model project. According to the construction plan of the steel structure fireproof coating, the civilized construction is ensured under the premise of safety and environmental protection, and the construction is completed on time.

Extended information: According to the construction plan of the steel structure fireproof coating, before the construction of the fireproof coating, the surface of the substrate should be derusted and rusted as required to achieve comprehensive and thorough. Before the construction of fireproof coatings, dust, oil and other impurities on the surface of the substrate should be removed, and the surface should be dusted and cleaned with high-pressure gas or high-pressure water gun.

After the surface of the substrate is free of water, dust, sundries, and oil stains, the construction of fireproof coatings can be carried out.

1.Treatment of the surface to be painted: Before construction, the surface of the supporting components should be cleaned (including the removal of rust, welding slag and other dirt); Check whether there is any leakage of the anti-rust primer on the surface of the steel structure, and repair it in time.

2.Storage of fire-retardant coatings: Paints that have passed the inspection should be stored in a dry and ventilated warehouse. Paint should be placed in a place that protects it from wind, rain and sun, and should not be used if the paint is clumping and deteriorating.

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What is the 2-hour work and process of steel structure fire retardant coating.

Construction process of steel structure fireproof coating: use different construction methods, tools and equipment to evenly coat the coating on the surface of the protected object. The quality of the coating directly affects the quality of the coating film.

For different protected objects and different fire retardant coatings, appropriate coating methods and equipment are adopted to obtain the best coating film quality. Therefore, it is necessary to choose different coatings and construction processes according to the different substrates to obtain the best results.

Fire retardant coating construction process

1. Before the steel structure is coated with fireproof coating, the surface of the steel frame should be rusted and treated with anti-corrosion. It is recommended to use epoxy zinc-rich anticorrosive primer, and epoxy anticorrosive primer can also be used. The anticorrosive primer must be done before the application of the fireproof coating can be carried out.

2. The WGNCB-02 fireproof coating should be fully stirred before construction, and it can be used only after it is uniform.

3. The thickness of the first construction is appropriate, and the second construction is carried out after the surface is dry, and the coating thickness is appropriate.

The time interval of each construction is subject to the coating without sticking to the hands (generally about 18-24 hours), the construction environment temperature is 0-40, the substrate temperature is 5-45, and the relative humidity of the air is not more than 90%. Keep the air circulation at the construction site, the wind speed is not more than 5m s, and it is not suitable for construction when condensing on the surface of outdoor operations or construction components.

4. The construction is mainly brushed, and it can also be sprayed, but the material will be wasted by 15-30%.

Fire retardant coating construction safety and environmental protection management

1. It is required that the mixed slurry is matured for 15-25 minutes before construction to ensure that the slurry reaches the best construction viscosity.

2. It is required to determine the amount of paint prepared according to the construction capacity, which can be used at any time. The prepared paint should be used up within 120 minutes, and it can no longer be used after solidification.

3. The first construction adopts the spraying construction method, the coating thickness is not more than 5 mm trapped, the second time can be sprayed or smeared, the coating thickness is not more than 10 mm each time, and the interval between each pass is 24 hours, until the design thickness is not less than mm.

4. The ambient temperature of the construction site is required to be 5-38, and the relative humidity is not more than 85%. The physical and chemical properties inspection and curing period is 28 days, and the fire resistance inspection and curing period is 40 days.

5. The undried coating shall not be collided, washed with water and rained.

The construction of fire retardant coating for steel structure is as follows:

1. The bottom coating should generally be sprayed 2-3 times of steel structure fireproof coating, with an interval of 4-24 hours between each time, and then sprayed 1 time after it is basically dry. The first spraying to cover the steel structure base surface 70 is as clear as it gets, and the thickness of each spraying is not more than millimeter. Each spray of 1 cm thick coating consumes about kilograms of fireproof coating for steel structures.

2. When spraying steel structure fireproof coating, the hand should hold the spray gun steadily, the nozzle should be perpendicular to the steel substrate or at an angle of 70 degrees, and the distance from the nozzle to the spray surface should be 40-60 cm. It is required to rotate the spraying, and the color of the lap joint is consistent, and the thickness is uniform. It is necessary to prevent leakage and flow, and ensure that the bottom layer of the steel structure fireproof coating is completely closed and the outline is clear.

3. During the spraying process, the operator should carry a thickness gauge needle to detect the thickness of the coating at any time to ensure that the coating of each part meets the thickness requirements specified in the design.

4. The coating formed by spraying is a granular surface, when the design is to roll the coating surface to be smooth and smooth, it is necessary to use a plastering knife to do the smoothing treatment at the last time after spraying, so that the surface is uniform and flat.

Features::

The steel structure usually loses its bearing capacity at 450 650 temperatures, and a large deformation occurs, resulting in the bending of steel columns and steel beams, and the result is that it can not continue to be used due to excessive deformation, and the fire resistance limit of the steel structure that is generally not protected is about 15 minutes. The length of this time is also related to the rate at which the component absorbs heat.

There are several construction methods for steel structure fireproof coatings, so what are the specific construction methods of steel structure anti-noise and simple firefighting coatings? Next, let's introduce it to you.

1. Brushing method: Brushing method is suitable for painting objects of any shape, and most fireproof coatings can be constructed by this method. The brushing method easily penetrates into the pores of the metal surface, thus enhancing the adhesion to the metal surface.

The disadvantage is that the production efficiency is low, the labor intensity is high, and sometimes there are brush marks on the surface of the coating, which affects the decoration of the coating.

2. Drum brushing method: the drum is a hollow cylinder with a small diameter, the surface is glued with long fluff made of synthetic fibers, two washers are installed at both ends of the cylinder, with a hole in the center, and the curved handle is passed through this hole.

3. Spraying method: Before spraying the steel structure fireproof coating, the parts and auxiliary accessories of the prepared spraying machine should be correctly installed and connected. The direction of the spray gun should always be parallel to the surface of the object to be coated and perpendicular to the spraying fan surface to ensure the uniformity of the coating.

In order to ensure adhesion and drying time, the thickness of the coating must be carried out after the previous coating is completely dry, and then the next spraying must be carried out, and the thickness of the coating must be applied each time until the total thickness meets the design requirements.