Environment-friendly lossless reinforcing method for outer wall composite layer

Abstract

The invention discloses a green lossless reinforcing method for an outer wall composite layer. The green lossless reinforcing method comprises the following steps that S1, materials are prepared; s2, wall surface treatment; s3, pasting the fiber cloth; s4, performing multi-layer reinforcement treatment; step S5, curing and curing; s6, surface protection treatment which is green and environment-friendly: the adopted green and environment-friendly binder has the characteristic of low VOC (volatile organic compound) emission, so that the pollution to the environment is reduced; in the construction process, large-scale dismantling or punching operation does not need to be carried out on the wall, generation of construction waste is avoided, the energy-saving and environment-friendly development concept of modern buildings is met, and lossless reinforcement is achieved; the wall is reinforced in the mode that fiber cloth is pasted on the surface, and the original structural integrity of the wall is reserved to the maximum extent; the integral stability of the building is not influenced, the use function and the space layout in the building are not interfered, and the method is suitable for reinforcing and repairing engineering of various existing building outer walls.

Description

Technical Field

[0002] The invention relates to the field of building technology, in particular to a green non-destructive reinforcement method for an exterior wall composite layer. Background Art

[0003] As the building ages and is affected by external environmental factors, the structural stability and durability of the exterior wall may have problems, such as cracking, peeling, and leakage. Traditional exterior wall reinforcement methods often have disadvantages such as complex construction, significant damage to the original wall structure, severe environmental pollution, and unsatisfactory reinforcement effects. For example, some reinforcement methods require large-scale demolition or drilling of the wall, which not only destroys the original structural integrity of the wall, but also may affect the overall stability of the building, while generating a large amount of construction waste, which is not conducive to environmental protection. Therefore, there is an urgent need for a green, non-destructive, and efficient exterior wall composite layer reinforcement method to solve these problems. Summary of the invention

[0004] In view of the problems in the related art, the present invention proposes a green non-destructive reinforcement method for an exterior wall composite layer to overcome the above-mentioned technical problems existing in the existing related art.

[0005] To this end, the specific technical solution adopted by the present invention is as follows: A green non-destructive reinforcement method for an exterior wall composite layer comprises the following steps: Step S1: material preparation; Step S2: wall surface treatment; Step S3: Fiber cloth pasting; Step S4: multi-layer reinforcement processing; Step S5: curing and maintenance; Step S6: surface protection treatment.

[0006] According to a further embodiment of the present invention, the material preparation in step S1 comprises the following steps: 1) High-strength fiber cloth: Choose carbon fiber cloth or glass fiber cloth with high tensile strength, corrosion resistance and good flexibility. The fiber bundles should be evenly distributed to ensure that stress can be effectively transferred during the reinforcement process and enhance the bearing capacity of the wall; 2) Green and environmentally friendly adhesive: A composite adhesive composed of water-based epoxy resin, nano-silica particles and plant fiber extract is used. The water-based epoxy resin provides good bonding properties, the nano-silica particles can enhance the hardness and wear resistance of the adhesive, and the plant fiber extract plays a role in thickening, dispersing and environmental protection, making the adhesive have the characteristics of low volatile organic compound (VOC) emissions, which meets green environmental protection requirements.

[0007] As a further solution of the present invention, the wall surface treatment in step S2 includes the following steps: 1) First, clean the surface of the exterior wall to remove dust, oil, loose coatings and debris. You can use high-pressure water guns, soft brushes, etc. to ensure that the wall surface is clean and smooth to ensure the bonding effect between the fiber cloth and the wall; 2) Repair the cracks on the wall surface. For cracks with a width less than 0.5mm, use crack grouting glue to seal them. For cracks with a width greater than 0.5mm, first use epoxy mortar to fill them, and then use crack grouting glue to seal the surface to ensure that there are no obvious cracks on the wall surface and prevent moisture penetration and further expansion of cracks.

[0008] As a further solution of the present invention, the fiber cloth pasting in step S3 includes the following steps: 1) According to the size of the wall and the reinforcement requirements, cut the fiber cloth of appropriate size, and evenly apply the prepared green environmentally friendly adhesive on one side of the fiber cloth. The coating thickness should be controlled between 0.5-1mm to ensure that the adhesive is evenly distributed without bubbles and missing coating; 2) Gently stick the fiber cloth coated with adhesive on the wall surface, use a special roller or scraper to roll or scrape it from one end of the fiber cloth to the other end in turn, expel the air between the fiber cloth and the wall, make the fiber cloth fit closely to the wall, ensure strong bonding. During the pasting process, the overlap width of the fiber cloth should not be less than 100mm to ensure the continuity and integrity of the reinforcement.

[0009] As a further solution of the present invention, the multi-layer reinforcement process in step S4: For situations where the bearing capacity requirements are high or the wall is severely damaged, multi-layer fiber cloth reinforcement can be carried out. After the first layer of fiber cloth is pasted and cured, the second and third layers of fiber cloth are pasted in sequence according to the above steps. The adhesive coating and pasting process between each layer of fiber cloth are the same. The fiber directions of two adjacent layers of fiber cloth should be perpendicular to each other to improve the isotropy of the reinforcement effect and enhance the force-bearing performance of the wall in different directions.

[0010] As a further solution of the present invention, the curing and curing in step S5 includes the following steps: 1) After the fiber cloth is pasted, it will naturally solidify at room temperature. The curing time depends on the ambient temperature and humidity conditions, generally 24-48 hours. During this period, disturbance and collision of the reinforced parts should be avoided to ensure that the adhesive is fully solidified and the fiber cloth and the wall form a stable composite structure; 2) After curing is completed, the reinforced parts of the exterior wall are watered for maintenance for 7-14 days, with watering at least 3 times a day to keep the surface of the reinforcement layer moist, promote further hardening of the adhesive and enhance the bonding strength between the fiber cloth and the wall, while preventing the reinforcement layer from cracking due to excessive drying.

[0011] As a further solution of the present invention, the surface protection treatment in step S6 comprises the following steps: 1) After the curing period, a layer of transparent waterproof and breathable coating is applied to the reinforced surface of the exterior wall to form a protective film to prevent the erosion of the reinforcement layer by external factors such as rain and ultraviolet rays. At the same time, it ensures that the water vapor inside the wall can be dissipated normally to avoid problems such as mold and damage to the wall caused by water vapor accumulation; 2) For exterior walls that require decoration, after the waterproof and breathable paint has dried, they can be painted and decorated with exterior wall paint that is coordinated with the original exterior wall of the building, according to the architectural style and design requirements, so that the reinforced exterior wall can meet the structural reinforcement requirements and have a good appearance.

[0012] Beneficial effects of the present invention 1. Green and environmentally friendly: The green and environmentally friendly adhesive used in the present invention has the characteristics of low VOC emissions, which reduces pollution to the environment; during the construction process, there is no need to carry out large-scale demolition or drilling operations on the wall, avoiding the generation of construction waste, which is in line with the development concept of energy conservation and environmental protection of modern buildings.

[0013] 2. Non-destructive reinforcement: The wall is reinforced by sticking fiber cloth on the surface, which maximizes the retention of the original structural integrity of the wall, does not affect the overall stability of the building, and does not interfere with the internal function and spatial layout of the building. It is suitable for reinforcement and repair projects of various existing building exterior walls.

[0014] 3. Good reinforcement effect: The composite reinforcement layer formed by high-strength fiber cloth and green environmentally friendly binder can effectively improve the tensile strength, bending strength and shear strength of the wall, enhance the bearing capacity and durability of the wall, and significantly extend the service life of the building. At the same time, multi-layer fiber cloth reinforcement and reasonable fiber cloth layout further improve the reliability and stability of the reinforcement effect, and can effectively deal with the deformation and damage of the wall under different stress conditions.

[0015] 4. Simple and quick construction: The reinforcement method of the present invention has a relatively simple construction process and is easy to operate. It does not require special construction equipment and technicians, can greatly shorten the construction period, reduce construction costs, and has high economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 A schematic diagram of a process of a green non-destructive reinforcement method for an exterior wall composite layer according to the present invention; DETAILED DESCRIPTION

[0017] According to an embodiment of the present invention, a green and non-destructive reinforcement method for an exterior wall composite layer is provided.

[0018] A green non-destructive reinforcement method for an exterior wall composite layer according to an embodiment of the present invention comprises the following steps: The following steps are involved: Step S1: material preparation; Step S2: wall surface treatment; Step S3: Fiber cloth pasting; Step S4: multi-layer reinforcement processing; Step S5: curing and maintenance; Step S6: surface protection treatment.

[0019] The material preparation in step S1 includes the following steps: 1) High-strength fiber cloth: Choose carbon fiber cloth or glass fiber cloth with high tensile strength, corrosion resistance and good flexibility. The fiber bundles should be evenly distributed to ensure that stress can be effectively transferred during the reinforcement process and enhance the bearing capacity of the wall; 2) Green and environmentally friendly adhesive: A composite adhesive composed of water-based epoxy resin, nano-silica particles and plant fiber extract is used. The water-based epoxy resin provides good bonding properties, the nano-silica particles can enhance the hardness and wear resistance of the adhesive, and the plant fiber extract plays a role in thickening, dispersing and environmental protection, making the adhesive have the characteristics of low volatile organic compound (VOC) emissions, which meets green environmental protection requirements.

[0020] The wall surface treatment in step S2 includes the following steps: 1) First, clean the surface of the exterior wall to remove dust, oil, loose coatings and debris. You can use high-pressure water guns, soft brushes, etc. to ensure that the wall surface is clean and smooth to ensure the bonding effect between the fiber cloth and the wall; 2) Repair the cracks on the wall surface. For cracks with a width less than 0.5mm, use crack grouting glue to seal them. For cracks with a width greater than 0.5mm, first use epoxy mortar to fill them, and then use crack grouting glue to seal the surface to ensure that there are no obvious cracks on the wall surface and prevent moisture penetration and further expansion of cracks.

[0021] The fiber cloth pasting in step S3 includes the following steps: 1) According to the size of the wall and the reinforcement requirements, cut the fiber cloth of appropriate size, and evenly apply the prepared green environmentally friendly adhesive on one side of the fiber cloth. The coating thickness should be controlled between 0.5-1mm to ensure that the adhesive is evenly distributed without bubbles and missing coating; 2) Gently stick the fiber cloth coated with adhesive on the wall surface, use a special roller or scraper to roll or scrape it from one end of the fiber cloth to the other end in turn, expel the air between the fiber cloth and the wall, make the fiber cloth fit closely to the wall, ensure strong bonding. During the pasting process, the overlap width of the fiber cloth should not be less than 100mm to ensure the continuity and integrity of the reinforcement.

[0022] Multi-layer reinforcement process in step S4: For situations where the bearing capacity requirements are high or the wall is severely damaged, multi-layer fiber cloth reinforcement can be carried out. After the first layer of fiber cloth is pasted and cured, the second and third layers of fiber cloth are pasted in sequence according to the above steps. The adhesive coating and pasting process between each layer of fiber cloth are the same. The fiber directions of two adjacent layers of fiber cloth should be perpendicular to each other to improve the isotropy of the reinforcement effect and enhance the force-bearing performance of the wall in different directions.

[0023] The curing and curing in step S5 includes the following steps: 1) After the fiber cloth is pasted, it will naturally solidify at room temperature. The curing time depends on the ambient temperature and humidity conditions, generally 24-48 hours. During this period, disturbance and collision of the reinforced parts should be avoided to ensure that the adhesive is fully solidified and the fiber cloth and the wall form a stable composite structure; 2) After curing is completed, the reinforced parts of the exterior wall are watered for maintenance for 7-14 days, with watering at least 3 times a day to keep the surface of the reinforcement layer moist, promote further hardening of the adhesive and enhance the bonding strength between the fiber cloth and the wall, while preventing the reinforcement layer from cracking due to excessive drying.

[0024] The surface protection treatment in step S6 includes the following steps: 1) After the curing period, a layer of transparent waterproof and breathable coating is applied to the reinforced surface of the exterior wall to form a protective film to prevent the erosion of the reinforcement layer by external factors such as rain and ultraviolet rays. At the same time, it ensures that the water vapor inside the wall can be dissipated normally to avoid problems such as mold and damage to the wall caused by water vapor accumulation; 2) For exterior walls that require decoration, after the waterproof and breathable paint has dried, they can be painted and decorated with exterior wall paint that is coordinated with the original exterior wall of the building, according to the architectural style and design requirements, so that the reinforced exterior wall can meet the structural reinforcement requirements and have a good appearance.

[0025] Case 1: A multi-storey residential building in a residential area had partial wall cracks and coating peeling on the exterior wall. Testing showed that the bearing capacity of the wall had decreased and needed to be reinforced.

[0026] 1. First, according to the above material preparation steps, carbon fiber cloth is selected as the reinforcement material to prepare a green and environmentally friendly adhesive, in which the mass ratio of water-based epoxy resin, nano-silica particles and plant fiber extract is 5:1:0.5.

[0027] 2. Clean the exterior wall surface and repair cracks. Use a high-pressure water gun to rinse the wall surface, and then use a soft brush to clean the remaining dust and debris. For cracks on the wall with a width of 0.3mm, use crack injection glue to inject and seal them. For cracks with a width of 0.8mm, first fill them with epoxy mortar, and then use crack injection glue to seal the surface.

[0028] 3. Cut the carbon fiber cloth according to the size of the wall, and evenly apply a green environmentally friendly adhesive with a thickness of 0.8mm on one side, stick the carbon fiber cloth on the wall surface, use a roller to roll it to expel the air, ensure that the fiber cloth fits tightly to the wall, and the overlap width is 120mm.

[0029] 4. After the carbon fiber cloth is naturally cured for 36 hours at room temperature, the reinforced parts of the exterior wall are watered for maintenance for 10 days, with watering 4 times a day.

[0030] 5. After the maintenance period, apply a layer of transparent waterproof and breathable paint, and then choose the same color of exterior wall paint for painting and decoration according to the color and style of the original building's exterior wall.

[0031] After being treated by the reinforcement method of the present invention, the cracks in the exterior wall of the residential building were effectively repaired, the bearing capacity of the wall was significantly improved, and the appearance was also restored and improved. After a period of observation, no new wall damage was found, and the reinforcement effect was good.

[0032] Case 2: The exterior wall of an industrial plant has been subjected to long-term erosion from industrial waste gas and mechanical vibration, resulting in large-scale peeling and deformation, requiring urgent reinforcement.

[0033] 1. Glass fiber cloth is selected as the reinforcement material, and the mass ratio of water-based epoxy resin, nano-silicon dioxide particles and plant fiber extract in the green and environmentally friendly adhesive is 6:1.2:0.8.

[0034] 2. Thoroughly clean the exterior wall surface and treat cracks, using a combination of mechanical grinding and chemical cleaning to remove corrosion products and loose coatings on the wall surface; for cracks on the wall with wider widths, first expand the cracks, then fill them with high-strength epoxy mortar and vibrate them to make them dense, and finally use crack injection glue to seal the surface.

[0035] 3. Cut the glass fiber cloth and apply adhesive, and paste and reinforce it in three layers. The pasting process of each layer of fiber cloth is the same. The fiber directions of two adjacent layers of fiber cloth are perpendicular to each other, ensuring that the overlap width of each layer of fiber cloth is not less than 150mm.

[0036] 4. After pasting, allow to cure naturally at room temperature for 48 hours, then water for 14 days, 5 times a day.

[0037] 5. After the maintenance is completed, apply waterproof and breathable paint, and according to the actual needs of the factory, perform functional coating treatment on the exterior wall, such as fire retardant coating, anti-corrosion coating, etc.

[0038] Through the above-mentioned reinforcement treatment, the stability of the exterior wall structure of the industrial plant has been significantly enhanced, which can meet the use requirements in the industrial production environment, effectively ensure the safe operation of the plant, and at the same time reduce the impact of the exterior wall reinforcement construction on production, and achieve good economic and social benefits.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A green and non-destructive reinforcement method for an exterior wall composite layer, characterized in that: The following steps are involved: Step S1: material preparation; Step S2: wall surface treatment; Step S3: Fiber cloth pasting; Step S4: multi-layer reinforcement processing; Step S5: curing and maintenance; Step S6: surface protection treatment.

2. A green non-destructive reinforcement method for an exterior wall composite layer according to claim 1, characterized in that: The material preparation in step S1 includes the following steps: 1) High-strength fiber cloth: Choose carbon fiber cloth or glass fiber cloth with high tensile strength, corrosion resistance and good flexibility. The fiber bundles should be evenly distributed to ensure that stress can be effectively transferred during the reinforcement process and enhance the bearing capacity of the wall; 2) Green and environmentally friendly adhesive: A composite adhesive composed of water-based epoxy resin, nano-silica particles and plant fiber extract is used. The water-based epoxy resin provides good bonding properties, the nano-silica particles can enhance the hardness and wear resistance of the adhesive, and the plant fiber extract plays a role in thickening, dispersing and environmental protection, making the adhesive have the characteristics of low volatile organic compound (VOC) emissions, which meets green environmental protection requirements.

3. A green non-destructive reinforcement method for an exterior wall composite layer according to claim 1, characterized in that: The wall surface treatment in step S2 includes the following steps: 1) First, clean the exterior wall surface to remove dust, oil, loose coatings and debris. Use high-pressure water guns, soft brushes, etc. to ensure that the wall surface is clean and smooth to ensure the bonding effect between the fiber cloth and the wall; 2) Repair the cracks on the wall surface. For cracks with a width less than 0.5mm, use crack grouting glue to seal them. For cracks with a width greater than 0.5mm, first use epoxy mortar to fill them, and then use crack grouting glue to seal the surface to ensure that there are no obvious cracks on the wall surface and prevent moisture penetration and further expansion of cracks.

4. A green non-destructive reinforcement method for an exterior wall composite layer according to claim 1, characterized in that: The fiber cloth pasting in step S3 includes the following steps: 1) According to the size of the wall and the reinforcement requirements, cut the fiber cloth of appropriate size, and evenly apply the prepared green environmentally friendly adhesive on one side of the fiber cloth. The coating thickness should be controlled between 0.5-1mm to ensure that the adhesive is evenly distributed without bubbles and missing coating; 2) Gently stick the fiber cloth coated with adhesive on the wall surface, use a special roller or scraper to roll or scrape it from one end of the fiber cloth to the other end in turn, expel the air between the fiber cloth and the wall, make the fiber cloth fit closely to the wall, ensure strong bonding. During the pasting process, the overlap width of the fiber cloth should not be less than 100mm to ensure the continuity and integrity of the reinforcement.

5. The green non-destructive reinforcement method for the exterior wall composite layer according to claim 1 is characterized by: The multi-layer reinforcement process in step S4: For situations where the bearing capacity requirements are high or the wall is severely damaged, multi-layer fiber cloth reinforcement can be carried out. After the first layer of fiber cloth is pasted and cured, the second and third layers of fiber cloth are pasted in sequence according to the above steps. The adhesive coating and pasting process between each layer of fiber cloth are the same. The fiber directions of two adjacent layers of fiber cloth should be perpendicular to each other to improve the isotropy of the reinforcement effect and enhance the force-bearing performance of the wall in different directions.

6. The green non-destructive reinforcement method for the exterior wall composite layer according to claim 1 is characterized by: The curing and curing in step S5 includes the following steps: 1) After the fiber cloth is pasted, it will naturally solidify at room temperature. The curing time depends on the ambient temperature and humidity conditions, generally 24-48 hours. During this period, disturbance and collision of the reinforced parts should be avoided to ensure that the adhesive is fully solidified and the fiber cloth and the wall form a stable composite structure; 2) After curing is completed, the reinforced parts of the exterior wall are watered for maintenance for 7-14 days, with watering at least 3 times a day to keep the surface of the reinforcement layer moist, promote further hardening of the adhesive and enhance the bonding strength between the fiber cloth and the wall, while preventing the reinforcement layer from cracking due to excessive drying.

7. The green non-destructive reinforcement method for the exterior wall composite layer according to claim 1 is characterized by: The surface protection treatment in step S6 comprises the following steps: 1) After the curing period, a layer of transparent waterproof and breathable coating is applied to the reinforced surface of the exterior wall to form a protective film to prevent the erosion of the reinforcement layer by external factors such as rain and ultraviolet rays. At the same time, it ensures that the water vapor inside the wall can be dissipated normally to avoid problems such as mold and damage to the wall caused by water vapor accumulation; 2) For exterior walls that require decoration, after the waterproof and breathable paint has dried, they can be painted and decorated with exterior wall paint that is coordinated with the original exterior wall of the building, according to the architectural style and design requirements, so that the reinforced exterior wall can meet the structural reinforcement requirements and have a good appearance.

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