Coating technology: Construction Technology of waterproof and moisture-proof coating

Key tips: 1 Project overview Within the scope of the project site, the annual average relative humidity is 80%, the maximum monthly relative humidity is 84%, the average humidity in the hottest month is 83%, the highest relative humidity over the years is 100%, and the lowest relative humidity over the years is 9% In view of the large number of water seepage points and humid air in the power house, in order to ensure the normal operation of the generator set and various power distribution devices and instruments, it is necessary to brush cement-based permeable crystalline (rigid) waterproof coating on the floor and wall (both sides) of the power house of plant a as the overall water and moisture-proof protective layer of the power house, so as to solve the problem of water seepage and humidity in the underground power house 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 home news: 1 Project overview within the project site, the average annual relative humidity is 80%, the maximum monthly relative humidity is 84%, the average monthly humidity is 83%, the maximum relative humidity over the years is 100%, and the minimum relative humidity over the years is 9% In view of the large number of water seepage points and humid air in the plant, in order to ensure the normal operation of the generator set and various power distribution devices and instruments, it is necessary to brush cement-based permeable crystalline (rigid) waterproof coating on the floor and wall (both sides) of the plant a as the overall water and moisture-proof protective layer of the plant to solve the problem of water seepage and humidity in the underground plant 2 Construction basis: 1) auxiliary power house building drawing (drawing No.: dz15d6-1-1-8); 2) design / modification notice (Jian (Chang) she a Zi No 13); 3) 98zj general building standard design building accessories atlas in central and South China; 4) GB gb18445-2001 cement based permeable crystalline waterproof materials; 5) GB gb50208-2001 code for quality acceptance of underground waterproof engineering; 6) 3 Technical proposal 3.1 technical proposal According to the performance and working mechanism of the cement-based permeable crystalline waterproof coating, the waterproof and damp proof layer is set on the wall and floor, which not only forms a dense waterproof layer, but also can effectively improve the wet environment of the underground powerhouse; it has a good effect on ensuring the normal operation of the generator set, various power distribution equipment and instruments 3.2 selection of materials According to the requirements of the document "design / modification notice: Jian (Chang) she a Zi No 13", cement-based permeable crystallization (rigid) waterproof coating is applied to the floor and brick wall (both sides) of each floor of the auxiliary power house In order to improve the waterproof and moisture-proof performance of the underground power house, Zhonghe 2000cn2000b cement-based permeable crystallization type, Pascal psi-200 cement-based permeable crystallization type and fuming cement-based permeable crystallization type are used in our part Three kinds of transparent crystal materials have been tested For the test report, please refer to "application form of construction technical scheme: FCB [2007] No b2-02-020" The final material selection shall be subject to the approval of the supervisor 3.3 mix proportion of pulp materials the preparation of pulp materials shall be in strict accordance with the requirements of material instructions 3.4 the base course shall be treated before the waterproof and damp proof course is applied (rolled) and brushed (1) For the plastering surface of brick wall, the base surface shall be polished and leveled, and the uneven part of the base surface shall be filled and leveled before the construction of the next process (2) For the concrete surface layer, the oil stain, rust, sundries, laitance, reinforcement and formwork on the concrete surface shall be completely removed by scraping, chiseling, polishing and other methods, and the concrete base surface shall be cleaned so that the waterproof coating can be closely combined (3) For the floor, the protruding objects and scum on the reinforced concrete floor shall be cleaned up, the surface shall be spread with plain cement slurry and made with 20 thick 1:2.5 cement mortar leveling layer, and then uniformly coated with cement-based permeable crystalline waterproof coating 3.5 the construction method of the coating is to wet the construction surface with water before painting The construction surface is damp but not wet, so as to make the water of the base course saturated as much as possible The coating construction can be carried out by brushing or rolling The brushing method is usually applied by hard bristle brush (artificial fiber is preferred), and the roll coating method is applied by special roller The coating (roll) is applied twice The coating is required to be uniform, and the coating (roll) is applied everywhere When applying (rolling) brush, pay attention to the force Brush back and forth in a crisscross way to ensure that the concave and convex parts can be painted evenly After the completion of the first coating, press it gently with fingers without any trace, and the second coating construction can be carried out after 4 hours If it is too dry, spray water first to wet and maintain, and the overlapping width of the layer shall not be less than 100mm 4 Construction method 4.1 brush (roll) construction method 4.1.1 prepare scaffold operation platform, construction water, power supply, slurry mixing machine and brush (roll) tools 4.1.2 construction process base surface cleaning → base surface treatment → division of painting area → sufficient wetting of base surface → preparation of slurry → painting → subsequent painting construction → maintenance → acceptance (1) Special fiber brush is used for painting equipment, and special roller is used for rolling equipment (2) First, clean the oil, rust, sundries, laitance and other pollutants on the base surface, and then clean the construction surface with water (3) Level the honeycomb and pitted surface (4) Prepare the slurry according to the required mix proportion, apply the first coat, and carry out the second coat construction after the interval of about 4-8 hours (depending on the indoor environmental humidity, press the coating with fingers, and the coating becomes hard without any trace) The corners and special parts of the side wall shall be painted first 4.2 construction technical requirements 4.2.1 climate and foundation surface conditions (1) the foundation surface of brick wall shall be carried out after the completion of cement mortar plastering, and the foundation surface shall be flat and clean Construction is not allowed when the ambient temperature is lower than 5 ℃ Ventilation shall be maintained for the construction surface completed in stages, and the air circulation is conducive to the bonding strength of the coating (2) The construction base surface of cement-based permeable crystalline waterproof coating shall be flat, firm, free of water, dust, oil and other pollutants The base surface shall be kept wet and free of open water, otherwise proper treatment shall be made (3) The concrete surface to be coated shall be cleaned in advance, and the coating construction shall be started when the base surface is kept clean and the saturated surface is dry The construction of each layer shall check the base surface according to the requirements of this base surface, and the newly poured concrete shall be cured for at least 7 days before construction (4) The concrete base surface shall be rough, clean, firm, flat, free from loose, sand and delamination, so as to provide a fully open capillary system and a firm attachment to facilitate the adhesion of the coating (5) The protruding objects such as the steel bar head shall be cut off and the parts shall be reinforced with psi-gx dry cement (6) For the floor, the protruding objects and scum on the reinforced concrete floor shall be cleaned up, the surface shall be spread with plain cement slurry and made with 20 thick 1:2.5 cement mortar leveling layer, and then uniformly coated with cement-based permeable crystalline waterproof coating 4.2.2 curing and curing treatment after the completion of the waterproof project, if the weather is hot, spray water for curing immediately when the surface of the waterproof coating is initially set to a sufficient hardness (touch with fingers, no trace) In most cases, spray water on the surface of the waterproof coating for only 3-4 times within 48 hours If the weather is hot, it may need to last for several days and spray water several times a day During the curing period, it is not allowed to stack any articles on the waterproof layer or carry out the construction of other processes Within 48 hours of construction, sewage and low temperature below 4oC must be prevented In case of poor ventilation at the construction site, artificial auxiliary ventilation measures shall be taken to accelerate air circulation and ensure normal dry and solid waterproof coating 5 Acceptance and application standard 5.1 material inspection standard shall be in accordance with gb18445-2001 cement based permeable crystalline waterproof material 5.2 project acceptance standard (1) the base course of waterproof and moisture-proof coating shall be firm, and the base surface shall be clean and flat without hollowing, loosening, sanding and peeling (2) The waterproof and moistureproof coating shall be firmly bonded with the base course, the surface shall be flat and evenly painted, and there shall be no defects such as flowing, folding, bubbling or edge warping (3) The coating thickness is not easy to detect, and the method of controlling the material consumption per square meter is adopted 6 Quality control measures (1) the quality management department shall control the whole process of construction quality in accordance with the quality management measures; (2) the laboratory shall control the raw materials required for construction to prevent unqualified materials from being used in the project (3) The base surface of the coating must be treated according to the specification requirements Before the coating construction, the surface layer shall be sprayed with enough water, wait for a period of time, brush one layer of coating, and when it is going to dry, brush the second layer in the direction perpendicular to the first layer (4) Finished product protection: after the completion of waterproof coating construction, the finished product protection work shall be done well, which shall not be washed by sewage, scratched by external forces, etc., and the labor achievements shall be cherished to prevent the decorative surface from being polluted and damaged in the subsequent project construction 7 Technical measures for safety, occupational health and environment 7.1 safety measures (1) the safety management department and production management department of the project department shall control and manage the safety in the construction process, which shall be supervised and implemented according to the corresponding safety management methods and safety measures of the project department (2) During painting operation, operators shall wear corresponding labor protection articles, such as gas masks, masks, gloves, etc To avoid harm to lungs, skin, etc (3) Temporary safety guardrail shall be built around the floor hole, with the height of 1.2m The hole itself shall be temporarily covered with 20mm thick large core plate, and the periphery shall be fixed with expansion bolts Safety warning signs shall be set up when transporting materials vertically and erecting and dismantling scaffolds (4) Enough illumination shall be provided for the construction in the tunnel Obvious signs shall be set up at the dangerous places for warning No bare wires and various electrical appliances shall be set up in the site for construction electricity Zero connection and grounding protection are adopted for the equipment It is strictly prohibited to construct with one gate and multiple machines Leakage protection devices are set in the distribution box for mobile equipment and hand-held electric tools Construction water and electric pipe lines are set near the hole to ensure smooth drainage of the site (5) Matters not covered shall be implemented in accordance with the safety committee of the headquarters and the management method of safe production and civilized construction of the project department 7.2 in the past engineering construction practice, we have fully realized the important role of civilized construction in project management First, civilized construction changes the appearance of the construction site, improves the working conditions of the staff, improves the working efficiency, and always maintains a good mental state Second, civilized construction can not only promote quality, ensure safety, but also improve economic benefits; civilized construction pays attention to norms, project construction management is more rigorous, reducing the waste caused by the invalid input of work, materials and machines; third, civilized construction can improve the project management level, promote the development of enterprise construction level, and enhance the competitiveness of enterprises In order to achieve the goal of creating a safe and civilized construction site, the project department will take the following measures and plans: (1) the safety management department and production management department of the project department shall control and manage the civilized construction in the construction process, and supervise the implementation according to the corresponding management methods and measures of the project department (2) The construction sequence shall be arranged reasonably to avoid mutual interference of processes, and the next process shall be opposite to the previous one