Construction method of high-precision fabricated exterior wall bead joint coating

Abstract

The invention provides a high-precision assembly type outer wall transparent seam coating construction method which comprises the following steps: S1, base surface treatment: cleaning the surface of an outer wall, removing loose, peeled, hollow and pulverized base surfaces, and removing dust and oil stains; and S2, alkali-resisting glass fiber gridding cloth is laid, anti-crack mortar is scraped on the surface of the base layer in batches, and then the gridding cloth is pressed into the anti-crack mortar. Before blade coating of the coating, the alkali-resisting glass fiber gridding cloth is matched with the anti-crack mortar, so that the anti-falling performance of the anti-crack mortar is enhanced, leveling of the surface of the outer wall is achieved, and follow-up coating spraying is facilitated; in addition, the construction steps of the coating are improved, the sequence of structural joint gluing is adjusted, and structural joint gluing is performed after the first time of flexible waterproof putty blade coating, so that the flatness of the wall surface is ensured, and the forming quality of the outer wall coating is improved.

Description

Technical Field

[0001] The present invention relates to the field of assembled exterior wall coating construction, and in particular to a high-precision assembled exterior wall seam-clearing coating construction method. Background Art

[0002] The conventional exterior wall coating application process for prefabricated buildings (base preparation (chisel, repair, and leveling) → structural joint caulking → one coat of flexible water-resistant putty → two coats of flexible water-resistant putty → polishing the putty → application of a sealer primer → marking, dividing, and taping → application of a mid-coat → spraying imitation stone paint → removing the tape, trimming, and applying a topcoat) falls short of high-quality construction requirements, resulting in poor results. The east and west gables, in particular, exhibit large wavy shapes under direct sunlight. This is due to large dimensional deviations in component processing at existing prefabricated component processing plants and the low skill level of prefabricated installation workers. This results in uneven exterior surfaces after prefabrication. Simply chiseling and repairing cannot achieve the required verticality and flatness for exterior wall coating application.

[0003] In view of this, the present application provides a high-precision assembled exterior wall seam-clearing coating construction method. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned shortcomings and provide a high-precision assembled exterior wall seam coating construction method that improves the molding quality of exterior wall coating.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a high-precision assembled exterior wall crack coating construction method, comprising the following steps: S1. Surface treatment: clean the exterior wall surface, remove loose, peeling, hollow, powdered surface, and remove dust and oil stains; S2. Lay alkali-resistant glass fiber mesh cloth, scrape anti-cracking mortar on the surface of the base layer, and then press the mesh cloth into the anti-cracking mortar; S3. Apply flexible water-resistant putty, scrape the wall with the flexible water-resistant putty, level the area and correct the internal and external corners; S4. Glue the structural joints. Clean the debris in the structural joints and blow away the dust with a blower. Paste masking tape on the upper and lower sides. Insert a foam stick into the structural joints and then glue and scrape them flat. S5. Apply the second coat of putty on the wall. Apply the second coat of flexible water-resistant putty in two steps, with an interval of no less than 5 hours between each step. S6. Apply surface paint. After the putty meets the design requirements, sand the wall surface to make it smooth, correct the damaged corners, and apply surface paint on the wall.

[0006] Furthermore, the surface paint includes a sealing primer, a middle layer of paint, a main coating of imitation stone paint and a finishing paint which are applied in sequence.

[0007] Furthermore, the specific steps of applying the surface paint in S6 include: S6.1. Apply a coat of sealer primer using a roller; S6.2. After the sealer has dried for 24 hours, apply two coats of mid-coat paint. S6.3. After the middle layer of paint is fully dried, spray the main layer of imitation stone paint. After the first layer of spraying has dried for at least 5 hours, spray the second layer of paint. S6.4. After the main coating of imitation stone paint is completely dry, clean the dust on the wall and spray the topcoat.

[0008] Furthermore, after S6.2, when the middle layer of paint is completed, the wall surface is inspected, and uneven and damaged parts are repaired with putty, and the repaired parts are polished after repair, and the sealing primer and middle layer of paint are re-applied.

[0009] Furthermore, in S6.3, when spraying the main coating of imitation stone paint, the construction temperature is not lower than 5°C, and the relative humidity of the air is less than 65%.

[0010] Furthermore, before S6.3, after the middle layer of paint is fully dried, the grid lines are drawn according to the design drawings, and after the lines are drawn, the areas around the doors and windows and the balcony railings are covered and protected.

[0011] Furthermore, before S1, the wall is cured until the pH value of the base surface is less than 10 and the water content is less than 10%. The curing time in winter is not less than 20 days, and the curing time in summer is not less than 10 days.

[0012] Furthermore, after S2, anti-cracking mortar is used for leveling, with a total thickness of no more than 5 mm, and a strong light is used at night to simulate sunlight to check the flatness of the wall surface and ensure that the base layer meets the requirements for subsequent paint construction.

[0013] Furthermore, in said S5, the thickness of the second coat of flexible water-resistant putty is 0.5-1 mm, and the thickness of each scraping does not exceed 0.5 mm. At night, a strong light is used to simulate sunlight to check the flatness of the wall surface to ensure that the base layer meets the requirements of subsequent paint construction.

[0014] Furthermore, before S1, the exterior wall panels are cut according to the design requirements, and the cutting part is located at the longer one of the assembled exterior wall panels on both sides. When the exterior wall panels are tilted, protruded, or concave, resulting in misalignment, the raised parts are polished and cut with a marble machine before applying sealant.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention enhances the anti-falling performance of the anti-cracking mortar by using alkali-resistant glass fiber mesh cloth before applying the paint, thereby achieving leveling of the exterior wall surface and facilitating subsequent paint spraying. In addition, the present application improves the paint construction steps, adjusts the order of gluing the structural joints, and performs gluing the structural joints after the first coat of flexible water-resistant putty is applied, thereby ensuring the flatness of the wall surface and improving the quality of exterior wall paint molding. There is no cracking or discoloration on the exterior wall, and the weather-resistant sealing performance of the joints remains excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 Schematic diagram of a flow chart of an embodiment of the present invention.

[0017] Figure 2 The figure is a schematic diagram of the process of applying surface paint according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-2 The high-precision assembled exterior wall seam coating construction method of the present invention comprises the following steps: According to the design requirements, the exterior wall panels are cut along the lines. The cutting part is located on the longer piece of the assembled exterior wall panels on both sides. If the exterior wall panels are tilted, protruding, or concave, resulting in misalignment, the raised parts are polished and cut with a marble machine before applying sealant. S1. Surface treatment: Curing the wall until the pH value of the surface is less than 10 and the moisture content is less than 10%. The curing time in winter is not less than 20 days, and in summer it is not less than 10 days. Clean the exterior wall surface to remove loose, peeling, hollow, and powdered surfaces, and remove dust and oil stains. S2. Lay alkali-resistant glass fiber mesh cloth, scrape anti-cracking mortar on the surface of the base layer, then press the mesh cloth into the anti-cracking mortar, and stick the mesh cloth until it is almost exposed. Use anti-cracking mortar to level the area. The total thickness of the anti-cracking mortar should be controlled within 5mm. Minimize joints during scraping and coating. Check the flatness with a ruler at any time to ensure that the final verticality and flatness are less than 2mm. Use a strong light to simulate sunlight at night to check the wall flatness to ensure that the base layer meets the requirements of subsequent coating construction. S3. Apply flexible water-resistant putty, scrape the wall with the flexible water-resistant putty, level the area and correct the internal and external corners; S4. Glue the structural joints. Clean the debris in the structural joints and blow away the dust with a blower. Paste masking tape on the upper and lower sides. Insert a foam stick into the structural joints and then glue and scrape them flat. S5. Apply the second coat of putty. Apply the second coat of flexible water-resistant putty on the wall in two steps, with an interval of no less than 5 hours. The thickness of the second coat of flexible water-resistant putty should be 0.5-1mm, and the thickness of each application should not exceed 0.5mm. Use a strong light to simulate sunlight at night to check the flatness of the wall and ensure that the base layer meets the requirements for subsequent paint construction. S6. Apply surface paint. After the putty meets the design requirements, sand the wall surface to make it smooth, correct the damaged corners, and apply surface paint on the wall. The surface paint comprises a sealing primer, a middle layer paint, a main coating of imitation stone paint and a finishing paint which are applied in sequence. The sealing primer and the middle layer paint adopt water-based Ketian anti-alkali sealing primer; the main coating of imitation stone paint adopts water-based Ketian naive stone paint; the finishing paint adopts Ketian naive stone paint finishing oil; The specific steps of applying the surface paint in S6 include: S6.1. Apply a coat of sealer primer using a roller; S6.2. After the sealer has dried for 24 hours, apply two coats of mid-coat. After the mid-coat is applied, inspect the wall surface and repair any uneven or damaged areas with putty. After repairs, sand the repaired areas and re-apply the sealer and mid-coat. S6.3. After the middle coat of paint has fully dried, draw the grid lines according to the design drawings. After drawing the lines, use masking tape or plastic film to cover the doors, windows, and balcony railings for protection. Spray the main coating of imitation stone paint. When spraying the main coating of imitation stone paint, the construction temperature should not be lower than 5℃ and the relative humidity should be less than 65%. After spraying the first coat, dry it for at least 5 hours before spraying the second coat. S6.4. After the main coating of imitation stone paint is completely dry, clean the dust on the wall and spray the topcoat. During construction, pay attention to maintaining consistency in viscosity, air pressure, and nozzle size, and pay attention to preventing sagging. The spraying should be uniform and comprehensive, and there should be no missing spraying. Generally, spraying at least once can achieve better results.

[0020] Anti-cracking mortar is a commonly used product in this field. The anti-cracking mortar produced by Anhui Zhaoyuan New Building Materials Co., Ltd. can be used, so the specific ingredients will not be described here.

[0021] Flexible water-resistant putty is water-based Ketian water-resistant putty.

[0022] The high-precision assembled exterior wall open seam coating construction method of this invention has been successfully applied in the BK202202 plot project in Hefei Binkecheng. The total construction area of ​​the project is 135,000 m 2 Ten residential buildings use precast concrete sandwich insulation exterior wall panels, and BIM technology is used to achieve joint precision control. During construction, "base treatment → 5mm thick plastering mortar + full paving 160g / m 2 The five-step process, consisting of alkali-resistant fiberglass mesh leveling, primer application, open joint positioning, and paint spraying, was verified leak-free by a 48-hour water spray test. A FARO laser scanner was used to monitor construction quality in real time, ensuring facade flatness within ±4mm. Periodic observations have confirmed no cracking or discoloration in the exterior wall system, and the joints maintain excellent weather-resistant sealing properties.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A high-precision assembled exterior wall seam coating construction method, characterized in that: The steps include: S1. Surface treatment: clean the exterior wall surface, remove loose, peeling, hollow, powdered surface, and remove dust and oil stains; S2. Lay alkali-resistant glass fiber mesh cloth, scrape anti-cracking mortar on the surface of the base layer, and then press the mesh cloth into the anti-cracking mortar; S3. Apply flexible water-resistant putty, scrape the wall with the flexible water-resistant putty, level the area and correct the internal and external corners; S4. Glue the structural joints. Clean the debris in the structural joints and blow away the dust with a blower. Paste masking tape on the upper and lower sides. Insert a foam stick into the structural joints and then glue and scrape them flat. S5. Apply the second coat of putty on the wall. Apply the second coat of flexible water-resistant putty in two steps, with an interval of no less than 5 hours between each step. S6. Apply surface paint. After the putty meets the design requirements, sand the wall surface to make it smooth, correct the damaged corners, and apply surface paint on the wall.

2. The high-precision assembled exterior wall seam coating construction method according to claim 1 is characterized in that: The surface paint comprises a sealing primer, a middle layer paint, a main coating of imitation stone paint and a finishing paint which are applied in sequence.

3. The high-precision assembled exterior wall seam coating construction method according to claim 2 is characterized in that: The specific steps of applying the surface paint in S6 include: S6.

1. Apply a coat of sealer primer using a roller; S6.

2. After the sealer has dried for 24 hours, apply two coats of mid-coat paint. S6.

3. After the middle layer of paint is fully dried, spray the main layer of imitation stone paint. After the first layer of spraying has dried for at least 5 hours, spray the second layer of paint. S6.

4. After the main coating of imitation stone paint is completely dry, clean the dust on the wall and spray the topcoat.

4. The high-precision assembled exterior wall seam coating construction method according to claim 3 is characterized in that: After S6.2, when the middle layer of paint is completed, check the wall surface, use putty to repair uneven and damaged parts, and polish the repaired parts after repair, and re-apply the sealing primer and middle layer of paint.

5. The high-precision assembled exterior wall seam coating construction method according to claim 3 is characterized in that: In S6.3, when spraying the main coating of imitation stone paint, the construction temperature is not lower than 5° C. and the relative humidity is less than 65%.

6. The high-precision assembled exterior wall seam coating construction method according to claim 3 is characterized in that: Before S6.3, after the middle layer of paint is fully dry, the grid lines should be marked according to the design drawings. After the lines are marked, the areas around the doors and windows and the balcony railings should be covered and protected.

7. The high-precision assembled exterior wall seam coating construction method according to claim 1 is characterized in that: Before S1, the wall is cured until the pH value of the base surface is less than 10 and the moisture content is less than 10%. The curing time in winter is not less than 20 days, and the curing time in summer is not less than 10 days.

8. The high-precision assembled exterior wall seam coating construction method according to claim 1 is characterized in that: After S2, anti-cracking mortar is used for leveling, with a total thickness of no more than 5 mm. At night, a strong light is used to simulate sunlight to check the flatness of the wall surface to ensure that the base layer meets the requirements for subsequent paint construction.

9. The high-precision assembled exterior wall seam coating construction method according to claim 1 is characterized in that: In said S5, the thickness of the second coat of flexible water-resistant putty is 0.5-1 mm, and the thickness of each scraping does not exceed 0.5 mm. At night, a strong light is used to simulate sunlight to check the flatness of the wall surface to ensure that the base layer meets the requirements of subsequent paint construction.

10. The high-precision assembled exterior wall seam coating construction method according to claim 1 is characterized in that: Before S1, the exterior wall panels are cut according to the design requirements. The cutting part is located on the longer piece of the assembled exterior wall panels on both sides. When the exterior wall panels are tilted, protruded, or concave, resulting in misalignment, the raised parts are polished and cut with a marble machine before applying sealant.

Images