How to repair a structure

Abstract

To provide a repair method by which a surface of a structure can be easily repaired.SOLUTION: A repair sheet is prepared that has a polymer cement hardened layer provided on a surface side of a structure and a resin layer provided on the polymer cement hardened layer. This sheet is applied to the surface of the structure. Preferably, the polymer cement hardened layer is a layer containing a cement component and a resin, and the resin is contained in an amount of 10 wt.% or more and 40 wt.% or less. The sheet may be bonded to the structure after the adhesive is applied to the surface of the structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for repairing the roof of a structure such as a house or building, and more particularly to a method for repairing a roof using a repair sheet that is extremely durable and can maintain the repaired state for a long period of time. [Background technology]

[0002] There are many types of roofs for structures such as ordinary homes and commercial buildings, including slate roofs, metal roofs, galvalume steel roofs (registered trademark), and concrete roofs, including flat roofs (also known as "rikuyane" or "rokuyane"). However, deterioration due to long-term exposure to wind and rain, or damage caused by disasters such as typhoons, can lead to leaks. When the roof of a structure deteriorates or is damaged, there are emergency measures that can be taken. Currently, emergency measures for the roof of a structure are typically carried out by placing a blue tarp 31 over the damaged area of ​​the roof 30, as shown in Figure 4, and placing multiple sandbags 32 on top of the blue tarp 31 as a weight. In addition to the method of placing the blue tarp 31 using weights such as sandbags 32, Patent Documents 1 and 2, for example, propose a method of securing the blue tarp using bags filled with water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3225057 [Patent Document 2] Utility Model Registration No. 3116572 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when repairing a roof using conventional blue tarps 31, it is difficult to prevent wrinkles in the blue tarp 31, and since the surface of the roof is usually not flat, there is a gap between the blue tarp 31 and the roof, and it is not possible to prevent water from entering through this gap. In addition, blue tarps are usually not very weather-resistant, so they deteriorate within a year or so and need to be replaced.

[0005] The present invention has been made in consideration of the current situation, and its object is to provide a roof repair method that can easily repair the surface of a structure's roof and can be maintained for a long period of time. [Means for solving the problem]

[0006] The inventors of the present invention have thoroughly investigated methods for repairing the surface of a structure's roof, and have found that by applying a repair sheet to the surface of a structure's roof instead of a tarp, gaps between the roof and the surface can be eliminated, and that the repair sheet can be given performance characteristics suited to the characteristics of the roof, specifically, conformability to accommodate cracks and expansion that occur in slate roofs, waterproofing to prevent the penetration of deterioration factors such as water and chloride ions, salt insulation, neutralization prevention, and water vapor permeability to allow moisture in the roof to be expelled as water vapor, while also providing a layer to ensure the strength of the repair sheet itself. This technical concept can also be applied as a repair method using a repair sheet to components other than the roof of a structure, such as walls, eaves, fences, gateposts, gates, and gate roofs of structures.

[0007] The roof repair method of the present invention is a roof repair method in which a repair sheet is attached to the surface of a roof of a structure, and is characterized in that the repair sheet comprises a polymer cement hardened layer provided on the surface side of the roof of the structure, and a resin layer provided on the polymer cement hardened layer.

[0008] According to this invention, the repair sheet is made up of only layers that do not include a base material or reinforcing members, so it can be easily attached to the repair area of ​​a structure's roof. As a result, gaps between the roof and the repair sheet can be eliminated, and repairs equivalent to full-scale repairs can be easily performed in a construction period similar to that required for installing a blue tarp. Specifically, in the roof repair method of the present invention, the repair area is first washed with water or the like, then an adhesive or adhesive primer is applied to the repair area with a roller or the like, and repair sheets are cut to an appropriate size and applied to the repair area one by one to complete the repair. The repair sheet used in the present invention can be applied even in a humid environment, eliminating the need for a drying process and allowing for construction in a short period of time. Furthermore, because the repair sheet is configured to include a polymer cement hardened layer and a resin layer provided on the hardened polymer layer, it can prevent leaks and the like over a long period of time, thereby providing long-term protection for the roof of the structure. The repair sheet has excellent adhesion between the roof and the polymer cement hardened layer provided on the roof side of the structure, and can impart excellent waterproofing, salt-proofing, neutralization-preventing properties, etc. to the resin layer provided on the polymer cement hardened layer. Furthermore, since the above repair sheet can be mass-produced using coating and drying processes on a factory production line, the present invention can reduce costs, significantly reduce on-site work time, and provide long-term protection for the roof of a structure. Furthermore, roof repair using the repair sheet of the present invention is essentially different from the conventional method of placing a blue tarp, which only provided temporary protection from wind and rain, and allows for long-lasting repairs with extremely simple procedures compared to previous methods. This is because the repair sheet of the present invention has excellent water resistance and salt blocking properties, protecting the roofing material from substances that corrode it, and also has moderate water vapor permeability, which allows excess moisture contained in the roofing material to be released to the outside, preventing corrosion and suppressing rust.

[0009] In the roof repair method according to the present invention, the hardened polymer cement layer is a layer containing a cement component and a resin, and may contain 10% by weight or more and 40% by weight or less of the resin, more preferably 20% by weight or more and 30% by weight or less of the resin.

[0010] According to this invention, controlling the ratio of the cement component to the resin component makes it easier to form a hardened polymer cement layer, and the hardened polymer cement layer tends to have excellent conformability and compatibility, which tends to improve the adhesion of the layer itself. Furthermore, the cement component contained in the hardened polymer cement layer on the roof side of the structure acts to enhance adhesion to the roof.

[0011] In the roof repair method according to the present invention, it is desirable to apply an adhesive to the surface of the roof of the structure and then attach the repair sheet.

[0012] According to this invention, a repair sheet is used that is composed only of layers that do not include a substrate or reinforcing member, so it can be easily attached to the surface of a structure's roof. As a result, even an unskilled worker can stably apply a repair sheet with excellent strength to the surface of a structure's roof, significantly reducing construction time and providing long-term protection for the structure's roof.

[0013] In the roof repair method according to the present invention, a primer layer may be provided between the roof of the structure and the adhesive.

[0014] According to this invention, the primer layer provided between the roof of the structure and the adhesive acts to enhance mutual adhesion, so that the repair sheet can stably protect the roof of the structure for a long period of time. [Effects of the Invention]

[0015] The present invention provides a roof repair method using a repair sheet that allows for easy and long-term repair of the surface of a structure's roof. In particular, the present invention provides a roof repair method using a repair sheet that provides performance tailored to the characteristics of the structure's roof, allowing it to adapt to cracks and expansion that occur in the roof, preventing the penetration of deterioration factors such as water and chloride ions into the structure's roof, providing permeability that allows moisture and deterioration factors to be expelled from the structure's roof, and improving strength. Furthermore, the present invention has the advantage of improving the stability and uniformity of quality compared to the method of manually applying multiple layers of paint to repair leaks at the construction site. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a roof repair method according to the present invention. [Figure 2] 1A and 1B are cross-sectional views showing an example of a repair sheet used in the present invention. [Figure 3] 1(A) to 1(C) are explanatory diagrams of a roof repair method according to the present invention. [Figure 4] FIG. 1 is an explanatory diagram of a conventional roof repair method. DETAILED DESCRIPTION OF THE INVENTION

[0017] The roof repair method according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following description and drawings, and various modifications are possible as long as the technical features are maintained.

[0018] The present invention is a roof repair method (hereinafter also referred to as the repair method of the present invention) in which a repair sheet is attached to the surface of a roof of a structure. That is, FIG. 1 is an explanatory diagram of the roof repair method of the present invention, and as shown in FIG. 1, the present invention includes a step of attaching a repair sheet 1 to the surface of a roof 10. The method of attaching the repair sheet 1 to the surface of the roof 10 can be either to a part of the surface of the roof 10 as shown in Figure 1, or to the entire surface of the roof 10, and can be determined appropriately depending on the size of the area that needs repair. Each component will be described below.

[0019] [roof] The structure having a roof that can be repaired by the repair method of the present invention is not particularly limited, and examples thereof include ordinary houses, and large structures such as gymnasiums, hospitals, and public facilities. The shape of the roof of the above structure is not particularly limited, and any shape such as a gabled roof, hipped roof, square roof, flat roof, shed roof, beckoning roof, or semi-cylindrical roof may be used. In addition, specific examples of the roofs of the above structures include slate roofs, roofs made of galvalume steel sheets (registered trademark), tin roofs (roofs made of zinc-plated steel sheets), metal roofs made of painted iron, and concrete roofs including flat roofs (called ``rikuyane'' or ``rokuyane''). Slate roofs are made of an inorganic decorative (cement) layer on a cement layer, with an inorganic paint applied via an inorganic colored stone layer, and are widely used as a roofing material for ordinary houses because they have a simple appearance, a wide range of colors, are light, and are inexpensive. However, slate roofs are more prone to cracking than roofs made of Galvalume steel sheets (registered trademark), and have lower durability and waterproofing than roofs made of other materials, making them more susceptible to problems such as breakage, making them particularly suitable for the roof repair method of the present invention. In the following explanation, the roof of the structure will also be referred to as a "slate roof, etc." The surface of the roof of the structure may be flat or may have irregularities similar to those of a typical slate roof, etc. In particular, the repair method of the present invention uses a repair sheet with a specific configuration to repair the roof of the structure, so that no gaps are formed even if the roof of the structure has an irregular surface such as a slate roof. Furthermore, applying the repair sheet to the roof of a structure has the distinct advantage of being able to follow up on cracks and expansion that occur in the roof of the structure, preventing deterioration factors such as water and chloride ions from penetrating into the interior of the roof of the structure, and allowing moisture inside the roof of the structure to be expelled as water vapor. In particular, for slate roofs and the flat roofs mentioned above, which are materials that tend to accumulate rainwater, the ability to expel water vapor is highly effective in preventing deterioration of the material.

[0020] [Repair sheet] As shown in Fig. 2, repair sheet 1 used in the present invention includes a polymer cement hardened layer 2 provided on the roof of a structure, and a resin layer 3 provided on the polymer cement hardened layer 2. Both the polymer cement hardened layer 2 and the resin layer 3 may each be formed as a single layer or as a laminate. Depending on the desired performance, another layer may be provided between the polymer cement hardened layer 2 and the resin layer 3.

[0021] The repair sheet 1 used in the present invention may be in the form of a sheet or a roll as shown in Fig. 1. When it is in the form of a roll as shown in Fig. 1, the required length can be pulled out and cut, allowing the repair sheet 1 of the required size to be applied to the area requiring repair. The size of the repair sheet 1 is not particularly limited, and can be adjusted appropriately to a size that can replace a conventional blue tarp.

[0022] The repair sheet 1 used in the present invention preferably has a thickness distribution within ±100 μm. Since the thickness distribution of this repair sheet 1 is within the above range, even an unskilled worker can stably apply a layer with little thickness variation to the surface of the roof of a structure. Furthermore, by controlling the thickness distribution within the above range, it becomes easier to uniformly reinforce the roof of a structure. The polymer cement hardened layer 2 provided on the roof side of the structure has excellent adhesion to the roof of the structure, and the resin layer 3 provided on the polymer cement hardened layer 2 can impart properties such as waterproofing, salt protection, and neutralization prevention. Furthermore, the repair sheet 1 can be mass-produced using coating and drying processes on a factory production line, which reduces costs, significantly reduces on-site construction time, and provides long-term protection for structure roofs. As a result, the construction time required for attaching the sheet to the surface of a structure roof can be significantly reduced, and the structure roof can be protected for a long period of time.

[0023] Specific examples of each component of the repair sheet 1 will be described in detail below. (polymer cement hardened layer) The polymer cement hardened layer 2 is a layer disposed on the roof side of a structure. This polymer cement hardened layer 2 may be, for example, a single layer without multiple coats as shown in FIG. 2(A), or may be a multi-layer structure with multiple coats as shown in FIG. 2(B). The decision to form a single layer or a multi-layer structure is made based on factors such as overall thickness, desired functionality (e.g., conformability, adhesion to the roof of the structure), factory production line, and production costs. For example, if the production line is too short to achieve the required thickness with a single layer, two or more layers can be applied. For example, when applying two layers, the first layer is dried and then the second layer is applied. Furthermore, polymer cement cured layer 2 may be configured by laminating layers of different properties. For example, by forming a layer with a higher resin content on the resin layer 3 side, the layer with a higher resin content will adhere to the resin layer, and the layer with a higher cement content will adhere to the utility pole, resulting in extremely good adhesion to both.

[0024] The hardened polymer cement layer 2 is obtained by coating a paint made from a resin (resin component) containing a cement component. Examples of the cement component include various cements, limestones containing calcium oxide, and clays containing silicon dioxide. Cement is preferred, and examples include Portland cement, alumina cement, high-early-strength cement, and fly ash cement. The cement to be selected depends on the properties that the polymer cement hardened layer 2 should have, for example, taking into consideration the degree of conformability to the utility pole. Portland cement as specified in JIS R5210 is particularly preferred.

[0025] Examples of the resin component include acrylic resin, acrylic urethane resin, acrylic silicone resin, fluororesin, flexible epoxy resin, polybutadiene rubber, acrylic resin exhibiting rubber properties (e.g., synthetic rubber containing acrylic ester as a main component), etc. From the viewpoint of improving adhesion between the hardened polymer cement layer 2 and the resin layer 3, it is preferable that such a resin component be the same as the resin component constituting the resin layer 3 described below.

[0026] The content of the resin component is adjusted appropriately depending on the materials used, etc., but is preferably 10% by mass or more and 40% by weight or less of the total of the cement component and the resin component. If it is less than 10% by weight, adhesion to the resin layer may decrease and it may become difficult to maintain the polymer cement cured layer as a layer. If it exceeds 40% by weight, adhesion to the roof of the structure may be insufficient. From the above perspectives, the content of the resin component is preferably in the range of 10% by weight or more and 40% by weight or less, more preferably 20% by weight or more and 30% by weight or less.

[0027] The coating material for forming the polymer cement cured layer 2 is a coating liquid obtained by mixing a cement component and a resin component in a solvent. The resin component is preferably an emulsion. For example, an acrylic emulsion is a polymer fine particle obtained by emulsion polymerization of a monomer such as an acrylic acid ester using an emulsifier. One preferred example is an acrylic acid polymer emulsion obtained by polymerizing a monomer or a monomer mixture containing one or more acrylic acid esters and methacrylic acid esters in water containing a surfactant. The content of the acrylic ester and the like constituting the acrylic emulsion is not particularly limited, but is selected within the range of 20 to 100% by mass. Furthermore, the surfactant is also blended in an amount as needed, and the amount is not particularly limited, but the surfactant is blended in an amount sufficient to form an emulsion.

[0028] The hardened polymer cement layer 2 is formed by applying the coating liquid onto a release sheet and then drying and removing the solvent (preferably water). For example, a mixed composition of a cement component and an acrylic emulsion is used as the coating liquid to form the hardened polymer cement layer 2. On the release sheet, the hardened polymer cement layer 2 may be formed after the hardened polymer cement layer 2 is formed, or the hardened polymer cement layer 2 may be formed after the hardened polymer cement layer 2 is formed on the release sheet.

[0029] The thickness of the hardened polymer cement layer 2 is not particularly limited and is set arbitrarily depending on the condition (damage state), shape, etc. of the roof of the structure. Specific thicknesses of the hardened polymer cement layer can be, for example, in the range of 0.5 mm to 1.5 mm. For example, when the thickness is set to 1 mm, the thickness variation is preferably within ±100 μm. Such a thickness precision is impossible to achieve by on-site coating, but can be achieved by stable coating on a factory production line. Even when the thickness is greater than 1 mm, the thickness variation can be kept within ±100 μm. Furthermore, when the thickness is thinner than 1 mm, the thickness variation can be further reduced.

[0030] Due to the presence of the cement component, water vapor permeates more easily through this hardened polymer cement layer 2 than through the resin layer 3 described below. The hardened polymer cement layer 2 preferably has a water vapor permeability of, for example, 20 to 60 g / m 2 The life span of the polymer cement layer is approximately 10 days. Furthermore, the cement component has good compatibility with the cement components constituting concrete, for example, and can be made to have excellent adhesion to the roof surface of a structure. Even when a primer layer 22 and an adhesive 23 are applied in that order on the surface of roof 21, as shown in FIG. 3, the polymer cement hardened layer 2 containing the cement component adheres well to adhesive 23. Furthermore, because the polymer cement hardened layer 2 is extensible, it can follow changes in the roof of the structure even if cracks or expansion occur in roof 21.

[0031] (resin layer) As shown in FIG. 3(C), the resin layer 3 is disposed on the opposite side of the roof 21 and appears on the surface. This resin layer 3 may be, for example, a single layer as shown in FIG. 2(A), or may be a laminate consisting of at least two layers as shown in FIG. 2(B). The decision as to whether to use a single layer or a laminate is based on factors such as the overall thickness, the desired functions (waterproofing, salt protection, neutralization prevention, water vapor permeability, etc.), the length of the factory production line, and production costs. For example, if the production line is too short to achieve the required thickness with a single layer, two or more layers can be applied in layers. In this case, the first layer is dried and then the second layer is applied. The second layer is then dried.

[0032] The resin layer 3 is obtained by applying a coating material that is flexible, can conform to cracks and fissures that occur on the roof surface of the structure, and can form a resin layer that is excellent in waterproofing, salt protection, neutralization prevention, and water vapor permeability. Examples of resins that make up the resin layer 3 include acrylic resins that exhibit rubber properties (e.g., synthetic rubbers containing acrylic esters as their main component), acrylic urethane resins, acrylic silicone resins, fluororesins, flexible epoxy resins, and polybutadiene rubber. This resin material is preferably the same as the resin components that make up the polymer cement hardened layer 2 described above. Resins that contain elastic film-forming components, such as rubber, are particularly preferred.

[0033] Among these, acrylic resins exhibiting rubber properties are preferably made from an aqueous emulsion of an acrylic rubber copolymer, due to their excellent safety and coatability. The proportion of the acrylic rubber copolymer in the emulsion is, for example, 30 to 70 mass%. The acrylic rubber copolymer emulsion can be obtained, for example, by emulsion polymerization of monomers in the presence of a surfactant. The surfactant can be any of anionic, nonionic, and cationic.

[0034] The coating material for forming the resin layer 3 is prepared by preparing a mixed coating liquid of a resin composition and a solvent, applying the coating liquid to a release sheet, and then drying and removing the solvent to form the resin layer 3. The solvent may be water or an aqueous solvent, or an organic solvent such as xylene or mineral spirits. In the examples described below, an aqueous solvent is used, and the resin layer 3 is prepared from an acrylic rubber composition. The order of the layers formed on the release sheet is not limited, and may be, for example, the order of resin layer 3 and hardened polymer cement layer 2 as described above, or the order of hardened polymer cement layer 2 and resin layer 3. However, it is preferable to form the resin layer 3 on the release sheet, and then form the hardened polymer cement layer 2.

[0035] The thickness of the resin layer 3 is set arbitrarily depending on the condition (damage state), shape, etc. of the roof 21. As an example, the thickness is set to any value within a range of 50 to 150 μm, and it is preferable that the thickness variation is within ±50 μm. Such a thickness precision is impossible to achieve by on-site coating, but can be achieved stably on a factory production line.

[0036] The resin layer 3 has high waterproofing properties, salt blocking properties, and neutralization prevention properties, but is preferably permeable to water vapor. The water vapor permeability of the resin layer 3 is, for example, the same as that of the repair sheet 1, 10 to 50 g / m 2 It is desirable to adjust the time as needed so that the time is 100-1500 sq. m / s. This allows the repair sheet 1 to have high waterproofing, salt-proofing, and neutralization prevention properties, as well as a predetermined water vapor permeability. Furthermore, by being composed of the same type of resin component as the polymer cement hardened layer 2, it is possible to achieve good compatibility with the polymer cement hardened layer 2 and excellent adhesion. The water vapor permeability was measured in accordance with JIS Z0208 "Test method for moisture permeability of moisture-proof packaging materials."

[0037] The resin layer 3 may also contain a pigment in order to provide a wide range of color variations for the repair sheet 1 used in the present invention. The resin layer 3 may also contain an inorganic substance. By containing an inorganic substance, scratch resistance can be imparted to the resin layer 3. The inorganic substance is not particularly limited, and examples thereof include conventionally known materials such as metal oxide particles of silica, alumina, titania, etc. Furthermore, the resin layer 3 may contain a known antifouling agent. The repair sheet used in the present invention is usually used to repair the roof of a structure installed outdoors, and therefore the resin layer 3 is often soiled, but by containing an antifouling agent, the repair sheet can be suitably prevented from being soiled. Furthermore, the resin layer 3 may contain additives that can impart various functions to the resin layer 3. Examples of such additives include cellulose nanofiber.

[0038] (Other configurations) The prepared repair sheet 1 may have a release sheet on one side of the polymer cement hardened layer 2 and the resin layer 3. The release sheet can protect the surface of the repair sheet 1, for example, during transportation to the construction site. At the construction site, the repair sheet 1 with the release sheet still attached can be adhered to the target roof 21 (or via the primer layer 22 or adhesive layer 23), and then the release sheet can be peeled off, greatly improving workability at the construction site. The release sheet may be the casting paper used in the production process of the repair sheet 1, or a protective film such as a polyethylene terephthalate film may be attached.

[0039] The casting paper used as the release sheet is not particularly limited in material, etc., as long as it is a conventionally known one used in the manufacturing process. For example, similar to known casting paper, preferred examples include laminated paper having an olefin resin layer such as polypropylene or polyethylene or a layer containing silicon. The thickness is also not particularly limited, but can be any thickness, for example, about 50 to 500 μm, as long as it is not a thickness that hinders handling during manufacturing and construction.

[0040] The repair sheet 1 described above can protect the roof 21 for a long period of time. In particular, the repair sheet 1 can be given performance according to the characteristics of the roof 21, allowing it to adapt to cracks and expansion that occur in the roof 21, preventing deterioration factors such as water and chloride ions from penetrating the roof 21, and providing permeability that allows moisture and deterioration factors in the roof 21 to be expelled. Furthermore, because such repair sheets 1 can be manufactured in factories, they can be mass-produced as high-quality sheets with stable characteristics. As a result, construction can be carried out without relying on the skills of a craftsman, shortening construction time and reducing labor costs. Furthermore, a design can be imparted to the surface of the resin layer 3, so that a design can also be imparted by attaching the repair sheet 1 to the roof 21. The method for imparting the design is not particularly limited, and examples include providing a textured shape by a known method and imparting a design by printing.

[0041] In the roof repair method according to the present invention, a repair sheet 1 is attached to the surface of a roof 21, as shown in FIG. In the present invention, it is preferable to apply adhesive 23 to the surface of the roof of the structure and then apply repair sheet 1. This construction method makes it possible to easily apply repair sheet 1 to the surface of roof 21. As a result, even an unskilled worker can install repair sheet 1 made up of layers with little variation in thickness on roof 21, significantly reducing the construction period and protecting roof 21 for the long term.

[0042] FIG. 3 is an explanatory diagram of a method for attaching the repair sheet 1. As shown in FIG. 3(A), it is preferable to form an undercoat layer 22 on the surface of the roof 21. The undercoat layer 22 can be formed by applying a coating liquid, which is a mixture of a resin such as an epoxy resin and a solvent, to the roof 21, and then evaporating and drying the solvent in the coating liquid. Examples of the solvent include water. The thickness of the undercoat layer 22 is not particularly limited, but can be within the range of 100 to 150 μm, for example. The undercoat layer 22 provided between the roof 21 and the adhesive 23 acts to enhance mutual adhesion, so the repair sheet 1 can stably protect the roof 21 for a long period of time. It is preferable to provide the undercoat layer 22 after repairing cracks or defects that have occurred in the roof 21. The repair material is not particularly limited, but cement mortar, epoxy resin, etc. are usually used.

[0043] After forming the undercoat layer 22, it is preferable to apply an adhesive 23 as shown in Fig. 3(B). It is preferable to apply the applied adhesive 23 without drying it, and then to attach the repair sheet 1 onto it as shown in Fig. 3(C). Examples of adhesive 23 include urethane adhesives, epoxy adhesives, and adhesives using acrylic resins with rubber properties (e.g., synthetic rubbers containing acrylic esters as the main component). Among these, adhesive 23 made of the same resin component as that constituting hardened polymer cement layer 2 of repair sheet 1 is more preferable because it increases the adhesive strength with hardened polymer cement layer 2. The thickness of adhesive 23 is not particularly limited. Adhesive 23 is usually applied by brushing or spraying, and then allowed to dry naturally over time to harden. Depending on the adhesive material selected, the presence of a primer layer is not essential, and it is possible to attach the repair sheet to the surface of the roof of a structure via only one layer of adhesive. [Example]

[0044] The present invention will be explained more specifically with reference to examples and comparative examples.

[0045] (Production Example 1) A release sheet made of PP laminated paper and having a thickness of 130 μm was prepared, and a resin layer was formed on the release sheet by the following method. First, an emulsion composition containing 60 parts by weight of acrylic silicone resin, 25 parts by weight of titanium dioxide, 10 parts by weight of ferric oxide, and 5 parts by weight of carbon black was prepared. This emulsion composition was applied to the release sheet, and then cured by heat treatment to form a resin layer. The thickness of the resin layer was adjusted to 0.1 mm. Next, a hardened polymer cement layer was formed on the resin layer. Specifically, a water-based acrylic emulsion containing 45 parts by weight of a cement mixture was prepared as a polymer cement cured layer-forming composition. The cement mixture contained at least 70±5 parts by weight of Portland cement, 10±5 parts by weight of silicon dioxide, 2±1 parts by weight of aluminum oxide, and 1 to 2 parts by weight of titanium oxide. The acrylic emulsion contained at least 53±2 parts by weight of an acrylic acid-based polymer obtained by emulsion polymerization using an acrylic acid ester monomer as an emulsifier, and 43±2 parts by weight of water. The polymer cement cured layer-forming composition obtained by mixing these components and applying and drying it was a composite layer containing 50% by weight of Portland cement in an acrylic resin. The composition for forming a hardened polymer cement layer was applied onto the resin layer and dried to form a single hardened polymer cement layer having a thickness of 1.29 mm. In this way, a repair sheet with a total thickness of 1.39 mm, width of 1 m and length of 3 m was produced.

[0046] [Measurement of strength] The strength of the repair sheet obtained in Production Example 1 was evaluated by the breaking strength measured with a tensile tester (AGS-J, manufactured by Shimadzu Corporation). When measured over a width of 50 mm, the strength of Production Example 1 was 1500N. [Measurement of thickness variation] For Production Example 1, pieces of approximately A4 size (200 mm x 300 mm) were cut out from the rolled repair sheet, and the thickness was measured at 14 points in each section, and the thickness variation was calculated. For Production Example 1, the thickness variation was 26 μm.

[0047] (Manufacturing Examples 2 to 4) In Production Example 1, the total thickness of the repair sheet was changed. In Production Example 2, a repair sheet with a total thickness of 0.76 mm was produced by laminating a 0.66 mm thick hardened polymer cement layer and a 100 μm thick resin layer. In Production Example 3, a repair sheet with a total thickness of 1.06 mm was produced by laminating a 0.96 mm thick hardened polymer cement layer and a 100 μm thick resin layer. In Production Example 4, a repair sheet with a total thickness of 1.57 mm was produced by laminating a 1.47 mm thick hardened polymer cement layer and a 100 μm thick resin layer. Other than that, the same as Production Example 1 was used.

[0048] [Strength and water vapor permeability] The strength and water vapor transmission rate of the repair sheets were measured for Manufacturing Examples 2 to 4. The strength was evaluated by the breaking strength measured with a tensile tester (AGS-J, manufactured by Shimadzu Corporation). The water vapor transmission rate (WVTR) is also called "moisture permeability" and is the rate measured at 1 m 2 It is expressed in grams of water vapor that permeates the film (repair sheet) in 24 hours, and is expressed as g / m 2 Expressed in units of .day or g / ml / day. Used as an index of water vapor barrier properties. Measured according to JIS Z0208(B).

[0049] The measurement results for a width of 50 mm for Manufacturing Example 2 were a strength of 1200 N and a water vapor permeability of 18.2 g / m 2 In Production Example 3, the strength was 1500 N and the water vapor permeability was 13.0 g / m 2 In Production Example 4, the strength was 1600 N and the water vapor permeability was 10.2 g / m 2 Regardless of the thickness, there were no problems with strength or water vapor permeability, and the film was usable.

[0050] Example 1 A typical detached house with a 15-year-old slate roof that was leaking was repaired using the repair sheet of the present invention in the following manner. First, the leak was observed from both inside and outside, and a roughly square area of ​​15 square meters was identified on the part of the slate roof that was thought to be the cause of the leak, and the repair sheet made in Manufacturing Example 1 was attached so as to completely cover this area. Most of the area was made up of slate material, but there was also a small metal peak called the ridge of the roof. When attaching the repair sheets, P300 (product name), an epoxy adhesive manufactured by Toa Gosei Chemical Co., Ltd., was used for the slate roof parts, and Cemedine PM165-RX (product name), a metal adhesive manufactured by Cemedine Co., Ltd., was used for the metal ridge parts. After applying the adhesive to each part of the roof and ridge, the repair sheet was covered and the surface was smoothed with a hand roller for pressure application. The repair sheet applied in this way was fixed to the roofing material within a few hours of application, and all of the adhesive had completely hardened within about two weeks. After it had completely hardened, we checked it visually and found that there was no deviation from the applied position. When the resident checked on this property three months after construction, it was found that there had been no leaks even after rainfall, confirming that the repair method of the present invention is effective in preventing leaks. Furthermore, visual inspection by the inventors revealed that there was no deviation from the construction position, and no peeling or lifting from the roof, confirming the durability of the repair. The same effect was confirmed when the protective sheets according to Production Examples 2 to 4, which had different total thicknesses, were used. [Explanation of symbols]

[0051] 1 Repair sheet 2. Polymer cement hardened layer 3 Resin layer 10, 21, 30 Roof 22 Primer layer 23 Adhesive 31 Blue tarp 32 Sandbags

Claims

1. A method for repairing a structure by attaching a repair sheet to a surface of the structure, comprising: The repair sheet includes a hardened polymer cement layer provided on the surface side of the structure, and a resin layer provided on the hardened polymer cement layer. A method for repairing a structure comprising the steps of:

2. 2. The method for repairing a structure according to claim 1, wherein the hardened polymer cement layer is a layer containing a cement component and a resin, and the resin content is 10% by weight or more and 40% by weight or less.

3. 3. The method for repairing a structure according to claim 1, wherein the repair sheet is attached to the surface of the structure after an adhesive is applied to the surface of the structure.

4. The method for repairing a structure according to claim 3 , further comprising providing an undercoat layer between the surface of the structure and the adhesive.

5. The repair method according to any one of claims 1 to 4, wherein the repair sheet is attached to a surface of a wall, eaves, fence, gatepost, gate door or gate roof of the structure.

6. structure, an adhesive layer overlying the structure; a cured polymer cement layer disposed on the adhesive layer; and a resin layer disposed on the hardened polymer cement layer; A repair structure for a structure comprising:

7. The repair structure of claim 6 further comprising a primer layer positioned between the structure and the adhesive layer.

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