1, steel structure fire protection coating construction problems test standard problem: many manufacturers of steel structure fire protection coating type approval certificate often does not have all the fire-resistant limit time or fire-resistant limit time for other time. This brings great difficulties to the on-site inspection of the construction quality of the fire protection coating for steel structures and daily fire supervision. It is impossible to judge whether the thickness of the surface of each type of steel component is to reach the fire resistance limit specified in the corresponding fire rating.
There is no complete correspondence between the steel beams described in the inspection report of the differences between the testing standard components and the actual engineering components and the steel components in the actual project. How to convert between the actual steel components and standard steel beams and how to determine the actual use The coating thickness of steel components is not stipulated by the country. This also brings a lot of problems for daily supervision and on-site inspection of construction quality. In the face of all kinds of steel components, there is no standard to determine the fire resistance limit after painting.
Sandwich problem The sandwich referred to here refers to the floor between two natural layers, which refers to the local level of the interior space of the house. The use of steel structures to build sandwiches is bound to do steel structure fire protection. When the construction quality of the project is inspected on site, the fire resistance limit of the sandwich steel column should be determined in the end. There is no relevant standard or a unified conclusion.
2. Construction countermeasures and measures for fire protection coating of steel structures Strengthen publicity and education to improve ideological understanding. There are many hidden dangers of fire hazards caused by steel structure fire protection projects, but one important reason is that fire prevention is despised, and there are chances of illegal construction. The publicity of fire prevention shall be carried out through newspapers, radios, leaflets, etc., and the organizations of design and construction shall be trained in the technical specifications and laws and regulations of fire protection, and the theoretical level of business and law-abiding awareness of design and construction personnel shall be raised. Areas where conditions permit can also make use of actual cases of fires, organize people to visit fire scenes, use the news media to publicly disclose fire damages and casualties, and convene people responsible for fires to openly handle the conference to make it deeply rooted in people’s hearts and form fire prevention for everyone in society. awareness.
(b) Actively develop new fire-retardant coatings for steel structures. At present, fire-retardant coatings on the market in China are generally water-based fire-retardant coatings and solvent-based fire-retardant coatings, but the former has a high formaldehyde content. The latter has flammable and harmful effects on the human body during production, construction, transportation, and storage. Hidden dangers and pollution to the environment at the same time. With the increasing emphasis on environmental pollution and personal health, the use of solvent-based coatings containing volatile organic compounds is increasingly restricted. In 1994, China promulgated the "Technical Requirements for Environmental Labeling Products," which clearly stated that environmental protection paints must not use formaldehyde, halide solvents, or aromatic hydrocarbons during the "product configuration or production process." In 2001, it introduced mandatory countries. The standard “Limits for Harmful Substances in Interior Decorating Materials for Interior Wall Coatings†clearly requires that the VOCs for indoor paints shall not exceed 200 g/L, and the concentration of free formaldehyde shall not exceed 0.1 g/L. The author believes that for fire-retardant coatings, it is necessary to speed up and develop “environmentally-friendly fire-retardant coatings†and actively look for new fire-retardant and flame-retardant components so that the fire-retardant coatings produced can not only protect the substrate from fire, but also burn. The product meets the requirements of human health.
(C) The correct selection of fire protection coating varieties. There are a wide variety of fire retardant coatings on the market, and their fire performance is also not the same. Therefore, we must fully investigate the role of various types of fire retardant coatings, to grasp its performance, and according to the normal use of substrate coating conditions and fire environmental conditions, such as the right choice of fire protection coating. According to the fire safety of the building to be protected, environmental conditions, production process, protection value and other aspects to be comprehensively considered, to truly achieve the fireproof performance of fire retardant coatings.
(D) Research and development of new evaluation criteria system. First of all, we must study and formulate a set of scientific product quality evaluation system. It is suggested that the national testing center can establish a set of product quality evaluation system for each manufacturer based on comprehensive consideration of the quality, production scale, and management level of the product. On the basis of the test report issued, based on this evaluation system, the fire resistance of the paint at other fire-resistance limits can be determined, and no type approval report for each fire endurance limit is required. Second, we must study and formulate the evaluation criteria and evaluation methods for durability.
At present, the performance of fire retardant paint is measured after the paint is applied for a period of time (usually 1 to 2 months) after the paint is applied. There is a certain gap between the actual state of use of the fire retardant paint and the durability cannot be accurately evaluated. The deterioration of the performance of coatings in the future leaves hidden dangers. Studying the method of rapidly assessing the service life of steel structure fire retardant coatings is an imminent task. Only when the assessment criteria and evaluation methods for the durability of fire-retardant coatings are established, can they provide the basis for the regular replacement of fire-retardant coatings.
(e) Strengthen the standardized management of the fire protection coating market. It is possible to issue a type approval certificate for manufacturers of fire-retardant coatings, an operating system for listed companies for fire-retardant coatings, a minimum quotation for fire control projects to be reviewed and reviewed, and a series of measures to strengthen the management of fire-fighting agency inspection units to strengthen fire-retardant coatings. Market management. If the conditions permit, the fire department shall provide follow-up supervision service to the construction site, timely supervise the rectification of hidden dangers and avoid unnecessary losses.
(6) Strict acceptance criteria to ensure project quality.
The fire department shall make the following points in the on-site inspection of construction quality: The thin-coated steel structure fire protection coating shall meet the following requirements: 1. The coating thickness meets the design requirements; 2. There is no leakage coating, powder removal, obvious cracks, etc. If there are individual cracks, the width is not greater than 0.5mm; 3. Between the coating and the steel substrate and between the coatings, should be firmly bonded, no delamination, empty drums, etc.; 4. Color and appearance in line with the design Provisions, clear outlines, smooth finishes. Thick-coated fire-retardant steel structure coatings must meet the following requirements: 1. The coating thickness meets the design requirements. If the thickness is lower than the original standard, but must be greater than 85% of the original standard, and the length of the continuous area of ​​the insufficient thickness part is not more than 1m, and no similar situation occurs within 5m; 2. The coating should be completely closed, Should not be exposed at the end, missing coating; 3. The coating should not appear cracks.
If there are individual cracks, the width should not be greater than 1mm; 4. Between the coating and the steel substrate and between the coatings, should be firmly bonded, no emptying, delamination and loose, etc.; 5. The coating surface There should be no mastoids. For parts with appearance requirements, the allowable deviation of straightness and roundness of busbars should not exceed 8mm.
With regard to the above-mentioned problems concerning the easy construction of steel structure fire-retardant coatings, Wuhan Wuli Coating Co., Ltd. has summarized and summarized for you based on years of experience in the construction of steel structure fire-retardant coatings. If you want to know more about the fire-retardant coating for steel structures For construction problems, please visit the company's website and Wuli Coatings will serve you wholeheartedly.
There is no complete correspondence between the steel beams described in the inspection report of the differences between the testing standard components and the actual engineering components and the steel components in the actual project. How to convert between the actual steel components and standard steel beams and how to determine the actual use The coating thickness of steel components is not stipulated by the country. This also brings a lot of problems for daily supervision and on-site inspection of construction quality. In the face of all kinds of steel components, there is no standard to determine the fire resistance limit after painting.
Sandwich problem The sandwich referred to here refers to the floor between two natural layers, which refers to the local level of the interior space of the house. The use of steel structures to build sandwiches is bound to do steel structure fire protection. When the construction quality of the project is inspected on site, the fire resistance limit of the sandwich steel column should be determined in the end. There is no relevant standard or a unified conclusion.
2. Construction countermeasures and measures for fire protection coating of steel structures Strengthen publicity and education to improve ideological understanding. There are many hidden dangers of fire hazards caused by steel structure fire protection projects, but one important reason is that fire prevention is despised, and there are chances of illegal construction. The publicity of fire prevention shall be carried out through newspapers, radios, leaflets, etc., and the organizations of design and construction shall be trained in the technical specifications and laws and regulations of fire protection, and the theoretical level of business and law-abiding awareness of design and construction personnel shall be raised. Areas where conditions permit can also make use of actual cases of fires, organize people to visit fire scenes, use the news media to publicly disclose fire damages and casualties, and convene people responsible for fires to openly handle the conference to make it deeply rooted in people’s hearts and form fire prevention for everyone in society. awareness.
(b) Actively develop new fire-retardant coatings for steel structures. At present, fire-retardant coatings on the market in China are generally water-based fire-retardant coatings and solvent-based fire-retardant coatings, but the former has a high formaldehyde content. The latter has flammable and harmful effects on the human body during production, construction, transportation, and storage. Hidden dangers and pollution to the environment at the same time. With the increasing emphasis on environmental pollution and personal health, the use of solvent-based coatings containing volatile organic compounds is increasingly restricted. In 1994, China promulgated the "Technical Requirements for Environmental Labeling Products," which clearly stated that environmental protection paints must not use formaldehyde, halide solvents, or aromatic hydrocarbons during the "product configuration or production process." In 2001, it introduced mandatory countries. The standard “Limits for Harmful Substances in Interior Decorating Materials for Interior Wall Coatings†clearly requires that the VOCs for indoor paints shall not exceed 200 g/L, and the concentration of free formaldehyde shall not exceed 0.1 g/L. The author believes that for fire-retardant coatings, it is necessary to speed up and develop “environmentally-friendly fire-retardant coatings†and actively look for new fire-retardant and flame-retardant components so that the fire-retardant coatings produced can not only protect the substrate from fire, but also burn. The product meets the requirements of human health.
(C) The correct selection of fire protection coating varieties. There are a wide variety of fire retardant coatings on the market, and their fire performance is also not the same. Therefore, we must fully investigate the role of various types of fire retardant coatings, to grasp its performance, and according to the normal use of substrate coating conditions and fire environmental conditions, such as the right choice of fire protection coating. According to the fire safety of the building to be protected, environmental conditions, production process, protection value and other aspects to be comprehensively considered, to truly achieve the fireproof performance of fire retardant coatings.
(D) Research and development of new evaluation criteria system. First of all, we must study and formulate a set of scientific product quality evaluation system. It is suggested that the national testing center can establish a set of product quality evaluation system for each manufacturer based on comprehensive consideration of the quality, production scale, and management level of the product. On the basis of the test report issued, based on this evaluation system, the fire resistance of the paint at other fire-resistance limits can be determined, and no type approval report for each fire endurance limit is required. Second, we must study and formulate the evaluation criteria and evaluation methods for durability.
At present, the performance of fire retardant paint is measured after the paint is applied for a period of time (usually 1 to 2 months) after the paint is applied. There is a certain gap between the actual state of use of the fire retardant paint and the durability cannot be accurately evaluated. The deterioration of the performance of coatings in the future leaves hidden dangers. Studying the method of rapidly assessing the service life of steel structure fire retardant coatings is an imminent task. Only when the assessment criteria and evaluation methods for the durability of fire-retardant coatings are established, can they provide the basis for the regular replacement of fire-retardant coatings.
(e) Strengthen the standardized management of the fire protection coating market. It is possible to issue a type approval certificate for manufacturers of fire-retardant coatings, an operating system for listed companies for fire-retardant coatings, a minimum quotation for fire control projects to be reviewed and reviewed, and a series of measures to strengthen the management of fire-fighting agency inspection units to strengthen fire-retardant coatings. Market management. If the conditions permit, the fire department shall provide follow-up supervision service to the construction site, timely supervise the rectification of hidden dangers and avoid unnecessary losses.
(6) Strict acceptance criteria to ensure project quality.
The fire department shall make the following points in the on-site inspection of construction quality: The thin-coated steel structure fire protection coating shall meet the following requirements: 1. The coating thickness meets the design requirements; 2. There is no leakage coating, powder removal, obvious cracks, etc. If there are individual cracks, the width is not greater than 0.5mm; 3. Between the coating and the steel substrate and between the coatings, should be firmly bonded, no delamination, empty drums, etc.; 4. Color and appearance in line with the design Provisions, clear outlines, smooth finishes. Thick-coated fire-retardant steel structure coatings must meet the following requirements: 1. The coating thickness meets the design requirements. If the thickness is lower than the original standard, but must be greater than 85% of the original standard, and the length of the continuous area of ​​the insufficient thickness part is not more than 1m, and no similar situation occurs within 5m; 2. The coating should be completely closed, Should not be exposed at the end, missing coating; 3. The coating should not appear cracks.
If there are individual cracks, the width should not be greater than 1mm; 4. Between the coating and the steel substrate and between the coatings, should be firmly bonded, no emptying, delamination and loose, etc.; 5. The coating surface There should be no mastoids. For parts with appearance requirements, the allowable deviation of straightness and roundness of busbars should not exceed 8mm.
With regard to the above-mentioned problems concerning the easy construction of steel structure fire-retardant coatings, Wuhan Wuli Coating Co., Ltd. has summarized and summarized for you based on years of experience in the construction of steel structure fire-retardant coatings. If you want to know more about the fire-retardant coating for steel structures For construction problems, please visit the company's website and Wuli Coatings will serve you wholeheartedly.
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