Sheet for structure

Abstract

A sheet (2) for a structure has a functional layer (4), an intermediate layer (6), an adhesive layer (8), and a reinforcement (10). The front surface (Sf) of the sheet (2) is the exposed surface of the functional layer (4). The front surface (Sf) includes a land portion (25) and a plurality of recesses (26). The recesses (26) are dispersed in a land portion (25) as a matrix. A land portion (25) is provided between one of the recesses (26) adjacent to each other and the other recess (26). The average spacing of the recesses (26) is preferably 0.02 mm or more and 1.0 mm or less. The area ratio of the land portion (25) to the recessed portion (26) is preferably 20 / 80 or more and 80 / 20 or less.

Description

Technical Field

[0001] This specification discloses a sheet material to be used in a state of being attached to a structure. Background Art

[0002] When exposed to wind and rain for a long period of time, a roof covered with artificial slate tiles deteriorates. There is a concern about leaks on the roof that has deteriorated. For the purpose of preventing roof leaks, paint is applied to artificial slate tiles. However, in the case of a roof covered with artificial slate tiles that has significantly deteriorated, applying paint cannot prevent roof leaks in some cases.

[0003] WO 2021 / 010456 discloses a structure protection sheet. The sheet has a polymer cement layer and a resin layer. When the sheet is attached to a roof, it can suppress roof leakage.

[0004] [Citation List] [Patent Document] [Patent Document 1] WO 2021 / 010456 Summary of the invention

[0005] [Technical issues] For the roof, designability is also important. From the viewpoint of designability, a sheet for a structure having a pattern on the front surface is preferred. A pattern having a three-dimensional shape is preferred. Examples of patterns having a three-dimensional shape include a land portion-sea portion pattern. In the land portion-sea portion pattern, the matrix is ​​the sea portion. A plurality of land portions are dispersed in the matrix. Each land portion rises from the sea portion. An example of a land portion-sea portion pattern is a relief pattern.

[0006] In the repair of a roof, a plurality of sheets are pasted to the roof. The sheets are pasted in a state of partially overlapping with other sheets. This overlap generates a seam. In the seam portion at the seam, rainwater can move. Water can pass through the seam along the seam portion and reach the surface of the roof. This sheet cannot sufficiently prevent the roof from leaking. A sheet having excellent waterproof properties is desired.

[0007] In the repair of a roof not covered with artificial slate tiles, the sheet material is also required to have both designability and waterproofness. In the repair or reinforcement of structures other than roofs, the sheet material is also required to have both designability and waterproofness.

[0008] The applicants of the present invention aim to provide a sheet material for structures having excellent designability and waterproofness.

[0009] [Solution to the problem] The sheet for construction disclosed by the present specification has a functional layer and an adhesive layer on the back surface of the functional layer. The front surface of the sheet for construction includes a land portion and a plurality of recessed portions separated from each other.

[0010] [Advantageous Effects of the Invention] In the sheet material for structures, the land portion and the plurality of recessed portions present on the front surface function as a pattern. The sheet material for structures has excellent designability. Since the recessed portions are separated from each other, water that has invaded a certain recessed portion does not reach any adjacent recessed portion. The sheet material also has excellent waterproof properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a perspective view showing a portion of a sheet for a structure according to one embodiment; Figure 2 is along Figure 1 A cross-sectional view taken along the midline II-II; Figure 3 It is shown by Figure 2 An enlarged view of the portion indicated by reference numeral III in FIG. Figure 4 It is shown Figure 1 A cross-sectional view of the sheet material used for the structure together with the roof; Figure 5 It is shown by Figure 4 An enlarged view of the portion indicated by reference numeral V in FIG. Figure 6 It is shown by Figure 4 An enlarged view of the portion indicated by reference numeral VI in FIG. Figure 7 It is shown that the Figure 4 An enlarged perspective view of a functional layer in a sheet for a structure; Figure 8 It is shown Figure 7 Plan view of the functional layers; Fig. 9 is along Figure 8 A cross-sectional view taken along the midline IX-IX; Fig.10 It is shown that the Figure 4 An enlarged plan view of a portion of a reinforcement in a sheet for a structure; Fig.11 It is shown Figure 6 an enlarged view of a portion of a seam; Fig.12 It is shown Fig. 9 an enlarged view of a portion of a functional layer; Fig.13is a cross-sectional view showing a portion of a sheet for a structure according to another embodiment; Fig.14 is an enlarged photograph showing the front surface of the sheet for a structure according to Example 1; Fig.15 is an enlarged photograph showing the front surface of the sheet for a structure according to Example 2; Fig.16 is an enlarged photograph showing the front surface of the sheet for a structure according to Comparative Example 1. DETAILED DESCRIPTION

[0012] Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings as appropriate.

[0013] [First embodiment] [Layer structure] Figures 1 to 3 A sheet 2 for a structure is shown. The sheet 2 is adhered to the structure. Figure 1 In FIG. 1 , arrow X indicates the width direction of the sheet 2, arrow Y indicates the length direction of the sheet 2, and arrow Z indicates the thickness direction of the sheet 2. The planar shape of the sheet 2 is generally rectangular. Figure 3 As is clear from the figure, the sheet 2 has a functional layer 4, an intermediate layer 6, an adhesive layer 8 and a reinforcement 10. The reinforcement 10 is in a state of being buried in the intermediate layer 6. The materials of each layer, etc. will be described in detail below. The sheet 2 has a front surface Sf and a back surface Sb. In an embodiment of the present invention, the surface exposed by the functional layer 4 is the front surface Sf, and the surface exposed by the adhesive layer 8 is the back surface Sb. The sheet 2 may have a release paper or a release film. The release paper and the release film are laminated on the adhesive layer 8.

[0014] [Roof repair] A typical use of the sheet material 2 for structures is the repair of roofs. Figures 4 to 6 A repaired roof 12 is shown. In these drawings, two sheets 2 (a first sheet 2a and a second sheet 2b) are shown together with the roof 12. The specifications of the second sheet 2b are the same as those of the first sheet 2a. Examples of the roof 12 include an artificial slate roof, a tile roof, a steel roof (including a folded plate roof), a copper roof, a galvanized iron roof, a concrete roof, and the like.

[0015] exist Figure 4 In the embodiment, the position of the lower edge 14a of the first sheet 2a is substantially consistent with the position of the lower edge 16 of the roof 12. The first sheet 2a is attached to the roof 12 as a whole. Figure 5 As shown in FIG. 1 , the roof 12 has a step 18. The first sheet 2a is bent near the step 18. The bending makes the first sheet 2a conform to the step 18.

[0016] like Figure 6 As shown, the second sheet 2b overlaps the upper edge 20a of the first sheet 2a near its lower edge 14b. This overlap forms a seam 22. In the second sheet 2b, the portion other than the seam 22 is attached to the roof 12. The upper edge 20a of the first sheet 2a forms a step 24 between the first sheet 2a and the roof 12. The second sheet 2b is bent near the step 24. This bending allows the second sheet 2b to conform to the step 24.

[0017] [Primer layer] The sheet 2 for a structure is usually attached to the roof 12 (with a primer layer in between). In this specification, the case where the sheet 2 is attached to the roof 12 (with a primer layer in between, etc.) will also be referred to as "the sheet 2 is attached to the roof 12". Figure 5 and 6 In the figure, the primer layer is not shown.

[0018] The material of the primer layer is preferably a curable resin composition. As curable resins, thermosetting resins and photocurable resins are exemplified. Preferred thermosetting resins are epoxy compounds. As epoxy compounds, bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, o-cresol novolac type epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, diglycidyl ethers of phenols and diglycidyl ethers of alcohols are exemplified. As curing agents for epoxy compounds, polyfunctional phenols, amines, polyamines, thiols, imidazoles, acid anhydrides and phosphorus-containing compounds are exemplified.

[0019] [Young's modulus of sheet] The Young's modulus of the sheet 2 for the structure is preferably 20 MPa or more and 300 MPa or less. When tension is applied to the sheet 2 having a Young's modulus of 20 MPa or more, permanent deformation and breakage are unlikely to occur. The sheet 2 has excellent operability. From this point of view, the Young's modulus is more preferably 30 MPa or more and particularly preferably 40 MPa or more. The sheet 2 having a Young's modulus of 300 MPa or less has excellent compliance. From this point of view, the Young's modulus is preferably 280 MPa or less and particularly preferably 260 MPa or less. The Young's modulus is measured according to the definition of "JIS K 7161". As an apparatus suitable for the measurement, the "Precision Universal Testing Machine AGXTM-V" manufactured by SHIMADZUCORPORATION is exemplified.

[0020] [Water vapor transmission rate of sheet] The water vapor transmission rate of the sheet material 2 for structures is preferably 10 g / m 2· day or more. When the sheet 2 has been attached to a structure, moisture contained in the structure or moisture present between the structure and the sheet 2 can be discharged through the sheet 2. The sheet 2 can inhibit corrosion of metal in the structure. The sheet 2 is also suitable for structures containing moisture (for example, structures with insufficiently dried concrete). The sheet 2 is also suitable for construction during rainy days. From these viewpoints, the water vapor transmission rate is more preferably 20 g / m 2 day or more and particularly preferably 25 g / m 2 · days or more. The water vapor transmission rate is preferably 50 g / m 2 · days or less. The water vapor transmission rate is measured according to the definition of "JIS Z 0208".

[0021] [Functional layer] As from Figure 3 As is clear from the above, in the embodiment of the present invention, the functional layer 4 is located at the top. In other words, when the sheet 2 has been attached to the structure, the position of the functional layer 4 is farthest from the structure in the thickness direction Z (see Figure 1 ). The functional layer 4 contributes to the desired function of the sheet 2. As the function, weather resistance, abrasion resistance, chemical resistance, water impermeability, moisture impermeability and moisture permeability are exemplified. Typical weather resistance is heat resistance and light resistance. The functional layer 4 can contribute to one or more functions.

[0022] The preferred material of the functional layer 4 is a polymer composition. The functional layer 4 is usually flexible. The sheet 2 for a structure having the functional layer 4 can conform to the unevenness of the substrate. The polymer composition contains a base material polymer. Synthetic resin, synthetic rubber and natural rubber can be included in the composition as the base material polymer. The functional layer 4 whose base material polymer is a synthetic resin is also referred to as a "resin layer".

[0023] In the case where light resistance is desired in the functional layer 4, a base material polymer that is less likely to deteriorate due to ultraviolet rays is preferred. Specifically, a polymer having a stronger binding energy than ultraviolet rays (410 KJ / mol) is preferred. As polymers that can contribute to the light resistance of the functional layer 4 and the flexibility of the sheet 2, acrylic resins, acrylic urethane resins, acrylic silicone resins, fluororesins, soft epoxy resins, and polybutadiene are exemplified.

[0024] From the viewpoint of light resistance, a resin particularly suitable for the base material polymer of the functional layer 4 is an acrylic silicone resin. Acrylic silicone resin has a siloxane bond. Acrylic silicone resin also has excellent heat resistance and cold resistance. Specific examples of compositions containing acrylic silicone resins include "COOL LIFE SP BLACK (CB1) P5-0" from Dainichiseika Color & Chemicals Mfg. Co., Ltd., "BELLEARTH ELASTIC BLACK" from Fujikura Kasei Co., Ltd., "ARONBULLCOAT T-1000" from Toagosei Co., Ltd., and "ACRYSET EMN325E" and "UWR EF 008" from NIPPON SHOKUBAI CO., LTD.

[0025] As required, the polymer composition for the functional layer 4 may contain additives such as pigments, fillers, reinforcing materials or antifouling materials. The functional layer 4 containing pigments has excellent designability. Organic pigments and inorganic pigments may be contained in the polymer composition. As fillers, metal oxide particles of silicon dioxide, aluminum oxide, titanium dioxide, etc. are exemplified. As reinforcing materials, cellulose nanofibers are exemplified. Depending on the function, the content ratio of each additive is adjusted.

[0026] In the case where the functional layer 4 is desired to be water-impermeable and moisture-permeable, the water vapor permeability of the functional layer 4 is preferably 10 g / m 2 · days or more and 50 g / m 2 · days or less. The water vapor transmission rate is measured according to the definition of "JIS Z 0208".

[0027] Figure 3 The arrow t1 in indicates the thickness of the functional layer 4. From the functional point of view, the thickness t1 is preferably 10 μm or more, more preferably 30 μm or more and particularly preferably 50 μm or more. From the compliance, productivity and lightweight point of view of the sheet 2, the thickness t1 is preferably 500 μm or less, more preferably 300 μm or less and particularly preferably 150 μm or less. The distribution of the thickness t1 is preferably within the range of ±50 μm. The sheet 2 for the structure may have two or more functional layers 4.

[0028] Figures 7 to 9The functional layer 4 is shown in an enlarged manner. As described above, the front surface Sf of the sheet material 2 for a structure is a surface where the functional layer 4 is exposed. The front surface Sf is composed of a land portion 25 (protruding portion) and a plurality of recessed portions 26 (recessed portions). These recessed portions 26 are dispersed in the land portion 25 as a matrix. In a plan view, the contour shape of each recessed portion 26 is a circle. Between a recessed portion 26 and another recessed portion 26 adjacent thereto, there is a land portion 25. The recessed portion 26 is surrounded by the land portion 25. In other words, the recessed portion 26 is separated from the other recessed portions 26. These recessed portions 26 and the land portion 25 form a rough pattern. The sheet material 2 for a structure has excellent designability. The sheet material 2 may have a recessed portion 26 (having a non-circular contour shape). As a non-circular contour shape, an ellipse and a polygon are exemplified. As a preferred polygon, an equilateral triangle, a square, a rhombus, and a regular hexagon are exemplified.

[0029] [Middle layer] (Back to Figures 1 to 3 ) The intermediate layer 6 contributes to the rigidity of the sheet 2, etc. The preferred material of the intermediate layer 6 is a composite material of a polymer and a filler. As polymers in the composite material, acrylic resins, acrylic silicone resins, fluororesins, silicone resins, epoxy resins, ethylene-vinyl acetate copolymers, and styrene-butadiene copolymers are exemplified. As fillers in the composite material, cement, silica, alumina, titanium oxide, calcium carbonate, and carbon black are exemplified. The preferred composite material is polymer cement. The polymer cement contains a polymer and cement. A typical polymer is an acrylic resin. As cement, Portland cement, alumina cement, and mixtures thereof are exemplified. Portland cement is preferred. The intermediate layer 6 whose material is polymer cement is also referred to as a "polymer cement cured layer".

[0030] In the case where the intermediate layer 6 contains a polymer and cement, the mass ratio of the polymer in the solid content of the intermediate layer 6 is preferably 10% or more and 40% or less. The intermediate layer 6 in which the ratio is 10% or more has excellent adhesion to other layers (functional layer 4 or adhesive layer 8). From this viewpoint, the ratio is more preferably 15% or more and particularly preferably 20% or more. The intermediate layer 6 in which the ratio is 40% or less can contain a sufficient amount of cement. From this viewpoint, the ratio is more preferably 35% or less and particularly preferably 30% or less.

[0031] In the case where the intermediate layer 6 contains a polymer and cement, the mass ratio of cement in the solid content of the intermediate layer 6 is preferably 20% or more and 70% or less. In the sheet 2 for a structure having the intermediate layer 6 in which the ratio is 20% or more, high tensile strength and small elongation can be achieved. The sheet 2 has excellent workability. From this viewpoint, the ratio is more preferably 30% or more and particularly preferably 35% or more. The intermediate layer 6 in which the ratio is 70% or less can contain a sufficient amount of polymer. From this viewpoint, the ratio is more preferably 60% or less and particularly preferably 55% or less.

[0032] The intermediate layer 6 can be formed by a liquid mixture obtained from a composition containing a polymer and a composition containing cement. The preferred composition containing a polymer is an acrylic emulsion. The acrylic emulsion can be obtained by emulsion polymerization of monomers. Emulsion polymerization can be carried out with an emulsifier. Polymerization can be carried out in water containing a surfactant. Typical monomers are acrylates or methacrylates. The content of the monomer component in the acrylic emulsion is 20% to 100% by mass.

[0033] Specific examples of the composition containing a polymer include a trade name “SPRING COAT BRUSH MIXTURE” from KIKUSUI Chemical Industries Co., Ltd. and a trade name “ARONBULLCOAT A450 BASE” from Toagosei Co., Ltd. Specific examples of the composition containing cement include a trade name “SPRING COAT BRUSH POWDER” from KIKUSUI Chemical Industries Co., Ltd. and a trade name “ARONBULLCOAT A450 SETTER” from Toagosei Co., Ltd.

[0034] The intermediate layer 6 containing polymer and cement has excellent water vapor permeability. Even when a structure is covered with the sheet 2 having the intermediate layer 6, the metal in the structure is less likely to corrode. The water vapor permeability of the intermediate layer 6 is preferably 20 g / m 2 · days or more and 60 g / m 2 · days or less. The water vapor transmission rate is measured according to the definition of "JIS Z 0208".

[0035] Figure 3The arrow t2 in indicates the thickness of the intermediate layer 6. In the embodiment of the present invention, as described above, the reinforcement 10 is in a state of being buried in the intermediate layer 6. Therefore, the thickness t2 is measured, including the reinforcement 10. From the viewpoint of the operability of the sheet 2, the thickness t2 is preferably 100 μm or more, more preferably 300 μm or more, and particularly preferably 500 μm or more. From the viewpoint of the compliance, productivity and light weight of the sheet 2, the thickness t2 is preferably 1500 μm or less, more preferably 1000 μm or less, and particularly preferably 700 μm or less. The distribution of the thickness t2 is preferably within the range of ±100 μm.

[0036] The material of the intermediate layer 6 may be a resin composition or a rubber composition. The sheet material 2 for a structure may have two or more intermediate layers 6. The sheet material 2 for a structure may have two intermediate layers 6 whose materials are different from each other. The sheet material 2 for a structure may have a layer configuration in which the intermediate layer 6 is not included.

[0037] From the viewpoint of adhesion of the intermediate layer 6 to the functional layer 4 , the base material polymer of the intermediate layer 6 is preferably the same as the base material polymer of the functional layer 4 .

[0038] [Adhesive layer] The adhesive layer 8 (or bonding adhesive layer) is in contact with the substrate. The sheet 2 can be attached to the structure by the adhesive force of the adhesive layer 8. The adhesive layer 8 enables a 0.5 N / mm 2 or higher adhesion.

[0039] The preferred material of the adhesive layer 8 is an adhesive composition containing a polymer as a base material. As polymers suitable for the adhesive composition, acrylic resins, silicones, polyurethanes, polyesters, natural rubbers and synthetic rubbers are exemplified. The polymer particularly preferably used as the base material is an acrylic resin. Specific examples of the adhesive composition include the trade names "ORIBAIN BPS 6574", "ORIBAIN BPS6554" and "ORIBAIN BPS 5565K" from TOYOCHEM CO., LTD.

[0040] The adhesive composition may contain a curing agent. In the case where the base material is an acrylic resin, a preferred curing agent is an isocyanate curing agent. The ratio of the isocyanate curing agent to 100 parts by mass of the acrylic resin is preferably 1.0 parts by mass or more, more preferably 2.0 parts by mass or more, and particularly preferably 2.5 parts by mass or more. The ratio is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and particularly preferably 7 parts by mass or less.

[0041] The adhesive composition may contain a tackifier. As tackifiers, rosin-based tackifiers, terpene-based tackifiers, petroleum resin-based tackifiers, and phenolic resin-based tackifiers are exemplified. The ratio of the tackifier to 100 parts by mass of the base material polymer is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and particularly preferably 1.5 parts by mass or more. The ratio is preferably 15 parts by mass or less, more preferably 10 parts by mass or less, and particularly preferably 7 parts by mass or less. Specific examples of tackifiers include trade names "ESTER GUM H", "ESTER GUM AA-V", and "ESTER GUM105" from ARAKAWA CHEMICAL INDUSTRIES, LTD.

[0042] Figure 3 The arrow t3 in FIG. indicates the thickness of the adhesive layer 8. From the viewpoint of adhesion, the thickness t3 is preferably 20 μm or more, more preferably 40 μm or more, and particularly preferably 50 μm or more. From the viewpoint of productivity, lightness, and operability of the sheet 2, the thickness t3 is preferably 500 μm or less, more preferably 200 μm or less, and particularly preferably 150 μm or less. The amount of the adhesive layer 8 is preferably 20 g / m 2 or larger and 250 g / m 2 The sheet material 2 for a structure may have two or more adhesive layers 8 .

[0043] [Reinforcement 10] The reinforcement 10 can give the sheet 2 used for the structure an appropriate Young's modulus. The reinforcement 10 can contribute to the large tensile strength of the sheet 2. In addition, the reinforcement 10 can contribute to the small elongation of the sheet 2. The sheet 2 including the reinforcement 10 has excellent operability. As described above, the reinforcement 10 is in a state of being buried in the intermediate layer 6. The reinforcement 10 can be in a state of being buried in the functional layer 4. The reinforcement 10 can be in a state of being buried in the adhesive layer 8. The reinforcement 10 can also be located between the functional layer 4 and the intermediate layer 6. The reinforcement 10 can also be located between the intermediate layer 6 and the adhesive layer 8. In this specification, the reinforcement 10 means an object that can give the sheet 2 a large tensile strength compared to a hypothetical sheet 2 having the same layer structure as the sheet 2 but not including the reinforcement 10.

[0044] The tensile strength of the reinforcement 10 is preferably 5.0 MPa or higher. The sheet 2 in which the tensile strength of the reinforcement 10 is 5.0 MPa or higher is less likely to break even when a tensile force is applied thereto. The sheet 2 has excellent operability. From this point of view, the tensile strength is more preferably 5.5 MPa or higher and particularly preferably 6.0 MPa or higher. From the perspective of the compliance of the sheet 2, the tensile strength of the reinforcement 10 is preferably 15.0 MPa or lower, more preferably 10.0 MPa or lower and particularly preferably 7.0 MPa or lower.

[0045] The elongation at break of the reinforcement 10 is preferably 15.0% or less. The sheet 2 in which the elongation of the reinforcement 10 is 15.0% or less is less likely to be deformed even when a tensile force is applied thereto. The sheet 2 has excellent handleability. From this point of view, the elongation of the reinforcement 10 is more preferably 13.0% or less and particularly preferably 11.0% or less. From the point of view of the compliance of the sheet 2, the elongation of the reinforcement 10 is preferably 5.0% or more, more preferably 7.0% or more and particularly preferably 8.5% or more.

[0046] The tensile strength and elongation were measured according to the test method for normal nonwovens defined in "JIS L 1913:2010". Test pieces for measurement were cut out from the reinforcement 10 or its original fabric. Five test pieces having a length direction consistent with the length direction of the reinforcement 10 or its original fabric and five test pieces having a length direction consistent with the width direction of the reinforcement 10 or its original fabric were used for measurement. Ten measured values ​​were averaged, and the tensile strength and elongation were calculated.

[0047] In a plan view, the ratio of the area of ​​the outline of the reinforcement 10 to the area of ​​the sheet 2 used for the structure is preferably 60% or more. A reinforcement 10 in which this ratio is 60% or more can contribute to the operability of the sheet 2. From this point of view, the ratio is more preferably 70% or more and particularly preferably 75% or more. The ratio can be 100%. From the perspective of compliance at the seam 22, the ratio is preferably 95% or less.

[0048] [Fabric] Fig.10A reinforcement 10 is shown. In the reinforcement 10, a plurality of warp threads 28a and a plurality of weft threads 28b are woven. In other words, the reinforcement 10 is a woven fabric (cloth). In an embodiment of the present invention, the woven fabric has a planar woven structure. A woven fabric is a fabric. The reinforcement 10 (which is a fabric) can be impregnated with the composition of the intermediate layer 6. The impregnation can contribute to the large tensile strength of the sheet 2. The impregnation can further contribute to the small elongation of the sheet 2. The reinforcement 10 can be a fabric other than a woven fabric. As fabrics other than woven fabrics, knitted goods (knitted fabrics) and cross-point welded mesh fabrics are exemplified.

[0049] As materials for the reinforcement 10, synthetic resin compositions and metals are exemplified. As preferred base material resins for the synthetic resin composition, polyethylene terephthalate, polyethylene naphthalate, aramid, vinylon, polypropylene, polystyrene, and polyvinylidene fluoride are exemplified. As preferred metals, aluminum alloys, carbon steel, and alloy steel are exemplified. The use of the warp 28a and weft 28b having high tensile strength makes it possible to achieve a sufficiently high tensile strength of the sheet 2. The use of the warp 28a and weft 28b having a small elongation makes it possible to achieve a sufficiently small elongation of the sheet 2.

[0050] As from Fig.10 Clearly, the reinforcement 10 has a large number of meshes 30. In the embodiment of the present invention, the planar shape of each mesh 30 is generally square. The intermediate layer 6 penetrates these meshes 30. This penetration can contribute to the high tensile strength of the sheet 2. This penetration can further contribute to the small elongation of the sheet 2.

[0051] Fig.10 The arrow P1 in indicates the spacing of the yarns 28. The spacing P1 is preferably 1.0 mm or more and 50 mm or less. In the reinforcement 10 in which the spacing P1 is 1.0 mm or more, a large amount of polymer cement or the like penetrates the mesh 30. The reinforcement 10 can contribute to the high tensile strength and small elongation of the sheet 2. From this point of view, the spacing P1 is more preferably 1.2 mm or more and particularly preferably 1.5 mm or more. In the reinforcement 10 in which the spacing P1 is 50 mm or less, the reinforcement 10 can contribute to the high tensile strength and small elongation of the sheet 2. From this point of view, the spacing P1 is more preferably 40 mm or less and particularly preferably 35 mm or less.

[0052] Figure 7The arrow D1 in indicates the thickness of the yarn 28. The yarn 28 having a large thickness D1 makes it possible to achieve high tensile strength and small elongation of the sheet 2. From this point of view, the thickness D1 is preferably 0.05 mm or more, more preferably 0.10 mm or more, and particularly preferably 0.15 mm or more. The thickness is preferably 1.0 mm or less.

[0053] A non-woven reinforcement 10 may be included in the sheet 2 for a structure. As the non-woven reinforcement 10, non-woven fabrics, long fibers, resin films, and metal foils are exemplified. A large number of short fibers dispersed in the composition may be the reinforcement 10. The sheet 2 may also have a layer configuration in which the reinforcement 10 is not included.

[0054] [Extra Layer] The sheet material 2 for structures may have an additional layer located on the functional layer 4. A typical additional layer is a transparent paint layer. The sheet material 2 for structures may have a layer located between the functional layer 4 and the intermediate layer 6. The sheet material 2 for structures may have a layer located between the intermediate layer 6 and the adhesive layer 8.

[0055] [Total thickness] Figure 3 The arrow Tt in indicates the total thickness of the sheet 2. The total thickness Tt is preferably 200 μm or more, more preferably 400 μm or more, and particularly preferably 500 μm or more. The total thickness Tt is preferably 5.0 mm or less, more preferably 3.0 mm or less, and particularly preferably 1.0 mm or less. The distribution of the total thickness Tt is preferably within the range of ±100 μm.

[0056] [Waterproofness of seams] Fig.11 Shown in an enlarged manner Figure 6 In the joint 22, the lower edge 14b of the second sheet 2b covers the front surface Sf of the first sheet 2a. When repairing the roof 12, the composition of the adhesive layer 8 in the second sheet 2b may enter the recessed portion 26 of the first sheet 2a. This entry is accompanied by the discharge of air in the recessed portion 26. However, in some of the recessed portions 26, the entry of the composition is insufficient, and air still exists. Fig.11 The first recessed portion 26a, the second recessed portion 26b, the third recessed portion 26c and the fourth recessed portion 26d in which air still exists are shown. These recessed portions 26 are separated from each other. Spaces Sp are generated between each of these recessed portions 26 and the adhesive layer 8 of the second sheet 2b. In this seam 22, there are a plurality of spaces Sp. These spaces Sp are separated from each other. The land portion 25 of the first sheet 2a is tightly adhered to the adhesive layer 8.

[0057] After repair, water may intrude into the first recessed portion 26a due to environmental reasons such as rainfall. Water accumulates in the first recessed portion 26a. The second recessed portion 26b is separated from the first recessed portion 26a. Therefore, the water in the first recessed portion 26a does not advance to the second recessed portion 26b.

[0058] The third recessed portion 26c is separated from the second recessed portion 26b. Even if water accumulates in the second recessed portion 26b for any reason, the water does not proceed to the third recessed portion 26c.

[0059] The fourth recessed portion 26d is separated from the third recessed portion 26c. Even if water accumulates in the third recessed portion 26c for any reason, the water does not proceed to the fourth recessed portion 26d.

[0060] In the repaired roof 12, water is less likely to pass through the joints 22. Therefore, water is less likely to reach the roof 12. The sheet 2 for a structure has excellent waterproof properties.

[0061] [Specifications of the recessed part] Fig.12 The arrow Dm in indicates the diameter of the recessed portion 26. The diameter Dm is measured by 100 randomly selected recessed portions 26, and the average diameter is calculated. The average diameter is preferably 0.05 mm or more and 1.0 mm or less. The recessed portion 26 with an average diameter of 0.05 mm or more can contribute to the designability of the sheet 2. From this point of view, the average diameter is more preferably 0.10 mm or more and particularly preferably 0.15 mm or more. The recessed portion 26 with an average diameter of 1.0 mm or less can contribute to the designability of the sheet 2. In addition, these recessed portions 26 are less likely to impair waterproofness. From this point of view, the average diameter is more preferably 0.6 mm or less and particularly preferably 0.45 mm or less. In the case where the contour of the recessed portion 26 is not circular, a circle with the same area as the area of ​​the contour is assumed. The diameter of the circle is considered to be the diameter Dm of the recessed portion 26.

[0062] Fig.12The arrow Dp in indicates the depth of the depression 26. The depth Dp is measured from 100 randomly selected depressions 26, and the average depth is calculated. The average depth is preferably 0.005 mm or more and 0.50 mm or less. The depressions 26 having an average depth of 0.005 mm or more can contribute to the designability of the sheet 2. From this point of view, the average depth is more preferably 0.020 mm or more and particularly preferably 0.030 mm or more. The depressions 26 having an average depth of 0.50 mm or less are less likely to impair the waterproofness. In addition, these depressions 26 do not impair the durability and weather resistance of the sheet 2. From this point of view, the average depth is more preferably 0.08 mm or less and particularly preferably 0.06 mm or less. From the perspective of the durability and weather resistance of the sheet 2, the average depth of the functional layer 4 is proportional to the thickness t1 (reference Figure 3 ) is preferably 80% or less, more preferably 60% or less and particularly preferably 35% or less.

[0063] The average area of ​​the depressions 26 is preferably 0.002 mm 2 or larger and 3.0 mm 2 or smaller. With 0.002 mm 2 The average area of ​​the recessed portion 26 is 0.004 mm or more, which can contribute to the designability of the sheet 2. From this point of view, the average area is more preferably 0.004 mm 2 or larger and particularly preferably 0.008 mm 2 or larger. With 3.0 mm 2 The recessed portions 26 having an average area of ​​2.5 mm or less can contribute to the designability of the sheet 2. In addition, these recessed portions 26 are less likely to impair the waterproofness. From this point of view, the average area is more preferably 2.5 mm 2 or less and particularly preferably 1.5 mm 2 The areas were measured from 100 randomly selected depressed portions 26, and the average area was calculated.

[0064] The area ratio of the land portion 25 to the recessed portion 26 is preferably 20 / 80 or more and 80 / 20 or less. The sheet 2 for a structure having this area ratio of 20 / 80 or more has excellent designability. The sheet 2 further has excellent waterproofness. From these viewpoints, the area ratio is more preferably 30 / 70 or more and particularly preferably 40 / 60 or more. The sheet 2 for a structure having this area ratio of 80 / 20 or less has excellent designability. From these viewpoints, the area ratio is more preferably 75 / 25 or less and particularly preferably 70 / 30 or less.

[0065] [Method for producing sheet] Hereinafter, an example of a method for manufacturing the sheet 2 for a structure will be described. In the manufacturing method, a polymer composition for a functional layer 4 is mixed with a solvent, and a first coating is obtained. The first coating is applied to a substrate film, and a first coating film is obtained. The first coating film is heated, and the solvent is volatilized from the first coating. The base material polymer is cured by the heating, and the functional layer 4 is obtained. The functional layer 4 having a rough pattern can be obtained by applying the first coating to a substrate film having a rough pattern on the surface. The rough pattern of the functional layer 4 has a shape in which the shape of the rough pattern of the substrate film is inverted.

[0066] Subsequently, the composite material for the intermediate layer 6 is mixed with a solvent, and a second paint is obtained. The second paint is applied to the functional layer 4, and a second coating film is obtained. The reinforcement 10 is pressed on the second coating film. The second coating film is heated, and the solvent is volatilized from the second paint. The polymer is cured by the heating, and the intermediate layer 6 including the reinforcement 10 is obtained.

[0067] Subsequently, the adhesive composition for adhesive layer 8 is mixed with a solvent to obtain a third coating. The third coating is applied to a release film to obtain a third coating film. The third coating film is heated to volatilize the solvent from the third coating to obtain an adhesive layer 8.

[0068] This adhesive layer 8 is overlapped with the intermediate layer 6. Furthermore, the base film is peeled from the functional layer 4, the release film is peeled from the adhesive layer 8, and the sheet 2 for a structure is obtained. The release film may remain in the sheet 2 for a structure.

[0069] [use] The sheet 2 for a structure has excellent conformability and can therefore be applied to a roof 12 in which there is a step 18 as described above. When a plurality of sheets 2 are repaired and pasted, the surface of the roof 12 can be covered with the sheet 2 in a wide area. Since the sheet 2 has the adhesive layer 8, it is not necessary to apply an adhesive (or bonding adhesive) to the roof 12. Since the adhesive layer 8 has excellent adhesion, even in the case where the material of the surface of the roof 12 is a composite material, the surface of the roof 12 can be covered with the sheet 2 in a wide area. For example, even in a roof 12 including both metal and artificial slate tiles on the surface, the surface of the roof 12 can be covered with the sheet 2 in a wide area.

[0070] The entire surface of the roof 12 may be covered with the sheet 2. In this specification, the surface of the roof 12 means a surface that can be visually identified when the roof 12 is viewed from above in the vertical direction. A repair method in which the entire surface of the roof 12 is covered with a single type of sheet 2 cannot be found from conventional construction methods.

[0071] The sheet 2 is lightweight compared to steel plates, copper plates, galvanized plates, etc. Therefore, even when the surface of the roof 12 is covered with the sheet 2 in a wide area, there is only a small adverse effect on the earthquake resistance of the building. From the viewpoint of earthquake resistance, the density of the sheet 2 is preferably 4.0 g / cm 3 or less, more preferably 3.0 g / cm 3 or less and particularly preferably 2.5 g / cm 3 This density is significantly lower than the density of an aluminum-zinc alloy coated steel plate (trade name "Galvalume steelplate") frequently used for repairing the roof 12 .

[0072] [Other uses] The sheet 2 can also help repair or reinforce structures other than the roof 12. Examples of structures other than the roof 12 include walls, pillars, eaves, fences, gates, doors, railings, copings, etc. of a house. The sheet 2 can also be used in commercial buildings, factories, warehouses, bridges, sewage facilities, railway facilities, utility poles, tunnels, etc.

[0073] [Repair and Reinforcement] After a structure (roof 12, etc.) is repaired or reinforced with the sheet 2 or a different sheet, there is a case where the sheet or structure breaks or deteriorates due to aging. Re-repair or re-reinforcement can be performed by pasting a newly prepared sheet 2 for the structure to the broken or deteriorated part of the sheet. When a new sheet 2 is pasted to an old sheet, the value of the structure can be maintained and maintained for an extremely long period of time. The pasting (overlapping) can be achieved with the adhesive force of the adhesive layer 8 in the new sheet 2. In this re-repair or re-reinforcement, there is no need to dispose of the old sheet. In this re-repair or re-reinforcement, waste generation can be suppressed. The sheet 2 conforms to the purpose of a circular economy. Even when a sheet 2 with a low density is laminated on an old sheet, there is only a small adverse effect on the earthquake resistance of the structure.

[0074] [Example 2] [Layer structure] Fig.13 FIG. 3 shows a sheet 32 ​​for a structure according to another embodiment. The sheet 32 ​​has a functional layer 34, an intermediate layer 36, and an adhesive layer 38. The specifications of the functional layer 34, the intermediate layer 36, and the adhesive layer 38, such as the material and the thickness, are similar to those of FIG. Figures 1 to 3 The functional layer 4, the intermediate layer 6 and the adhesive layer 8 of the sheet 2 for the structure shown in FIG. 3 are the same in specifications. The sheet 32 ​​does not have a reinforcement 10 (refer to FIG. 3 ). Figure 3 ). The sheet 32 ​​has a front surface Sf and a back surface Sb.

[0075] [Functional layer exposed surface] The front surface Sf of the sheet material 32 for a structure is a surface on which the functional layer 34 is exposed. The front surface Sf is composed of a land portion 40 and a plurality of recessed portions 42. The land portion 40 and the recessed portions 42 form a Figure 7 The sheet 32 ​​has excellent designability. Each of the recessed portions 42 has a rough pattern similar to that shown in FIG. Figure 8 and 9 The shape of the recessed portion 26 shown in FIG. The recessed portion 42 is separated from other recessed portions 42. In the joint formed by the sheet material 32, water accumulated in the recessed portion 42 does not advance to the adjacent recessed portion 42. The sheet material 32 has excellent waterproof properties.

[0076] [Example 3] The front surface of the sheet used for the structure may have a rough pattern (including either or both of micro-protrusions and micro-dents). The rough pattern does not have a land portion-depression configuration. The seam can be formed by overlapping the adhesive layers of different sheets on the front surface. When the adhesive layer is sufficiently compliant with the rough pattern, a seam without spaces can be obtained. The seam has excellent waterproofness. In the seam, multiple spaces separated from each other can be formed. These spaces are unlikely to impair waterproofness. The roughness of the rough pattern or the fluidity of the adhesive layer is adjusted so that the adhesive layer is sufficiently compliant with the rough pattern.

[0077] Examples Hereinafter, the effects of the sheet for a structure according to examples will be explained. The scope disclosed in the present specification should not be interpreted in a limited manner based on the description of these examples.

[0078] [Example 1] An acrylic silicone resin and a solvent are mixed together to obtain a first coating. The first coating is applied to a release sheet having a rough pattern on the surface to obtain a first coating film. The first coating film is injected into an oven and maintained at a temperature of 80°C for one hour to produce a functional layer. The thickness of the functional layer is 100 μm. On the front surface of the functional layer, a pattern having a shape in which the shape of the rough pattern of the release sheet is inverted is formed. An enlarged photograph of the pattern is shown in Fig.14 The pattern has a land portion and a plurality of recessed portions. The contour shape of each recessed portion is a circle.

[0079] An acrylic emulsion (trade name "SPRING COAT BRUSH MIXTURE" described above) and a cement composition (trade name "SPRING COAT BRUSH POWDER" described above) are mixed together to obtain a second paint. The second paint is applied to the back of the functional layer to obtain a second coating film. A woven fabric ("KANREISHA #600 CREMONA" from Kuraray Co., Ltd.) is pressed onto the second coating film as a reinforcement. The second coating film is heated to obtain an intermediate layer including a reinforcement. The thickness of the intermediate layer is 300 μm.

[0080] One hundred parts by mass of an adhesive containing an acrylic resin (the trade name "ORIBAIN BPS 6574" described above) and 6 parts by mass of an isocyanate-based curing agent (the trade name "BHS 8515" from TOYOCHEM CO., LTD.) were mixed together to obtain a third coating having a gel fraction of 57%. The third coating was applied to a release film to obtain a third coating film. The third coating film was heated to obtain an adhesive layer. The thickness of the adhesive layer was 100 μm.

[0081] The adhesive layer is overlapped with the intermediate layer. In addition, the release sheet is peeled off from the functional layer, and the release film is peeled off from the adhesive layer to obtain a Figures 1 to 3 A sheet for a structured object of Example 1 of the layer configuration shown in . The front surface of the sheet had an arithmetic mean roughness Ra of 28.9 μm and a maximum depth of 114 μm.

[0082] [Example 2] A sheet for a structure of Example 2 was obtained in the same manner as in Example 1, except that the first coating was applied to a release sheet having a rough pattern different from that of the release sheet in Example 1. The front surface of the sheet had an arithmetic mean roughness Ra of 25.6 μm and a maximum depth of 65 μm. An enlarged photograph of the front surface is shown in FIG. Fig.15 The pattern has a land portion and a plurality of recessed portions. The outline shape of each recessed portion is a square.

[0083] [Comparative Example 1] A sheet for a structure of Comparative Example 1 was obtained in the same manner as in Example 1, except that the first coating was applied to a release sheet having a rough pattern different from that of the release sheet in Example 1. The front surface of the sheet had an arithmetic mean roughness Ra of 30.7 μm and a maximum depth of 127 μm. An enlarged photograph of the front surface is shown in FIG. Fig.16The sheet has a land portion-ocean portion pattern. In this pattern, the ocean portion is the matrix.

[0084] [Evaluation of Waterproofness] Two test pieces were cut from the sheet for construction. The size of each test piece was 100 mm × 55 mm. These test pieces were pasted to a flexible plate so that the width of the joint reached 10 mm. The flexible plate was a plate defined in "JIS A 5430", and its thickness was 4 mm. These test pieces were subjected to the water permeability test defined in "JIS A 6909:2014" - Method B, and the amount of permeated water was measured. The results are shown below: Example 1: Approximately 0.4 mL Example 2: Approximately 0.4 mL Comparative Example 1: greater than 5.0 mL.

[0085] As is clear from these evaluation results, the sheet for structures of each example is excellent in waterproofness.These evaluation results illustrate the superiority of the sheet for structures.

[0086] [Disclosed items] Each of the following items discloses a preferred embodiment.

[0087] [Project 1] A sheet for a structure, comprising: a functional layer; and an adhesive layer located on the back side of the functional layer, The front surface of the sheet of the structure includes a land portion and a plurality of recessed portions separated from each other.

[0088] [Project 2] The sheet for structures according to Item 1, wherein the area ratio of the land portion to the recessed portions on the front surface is 20 / 80 or more and 80 / 20 or less.

[0089] [Item 3] The sheet for a structure according to item 1 or 2, wherein the average area of ​​the recessed portions is 0.005 mm 2 or larger and 5.0 mm 2 or smaller.

[0090] [Item 4] The sheet for structures according to any one of items 1 to 3, wherein an average depth of the recessed portions is 0.005 mm or more and 0.50 mm or less.

[0091] [Item 5] The sheet for a structure according to any one of items 1 to 4, wherein an average interval of the recessed portions is 0.02 mm or more and 1.0 mm or less.

[0092] [Item 6] The sheet for a structure according to any one of items 1 to 5, wherein the contour shape of each recessed portion is circular, elliptical, or polygonal.

[0093] [Item 7] The sheet for a structure according to any one of items 1 to 6, further comprising: an intermediate layer located between the functional layer and the adhesive layer, The material of the intermediate layer is a composite material containing a polymer and a filler (eg, cement).

[0094] [Item 8] The sheet for a structure according to any one of items 1 to 7, further comprising: a reinforcing material located between the functional layer and the adhesive layer, The reinforcement is a fabric.

[0095] [Item 9] A repair structure for a structure, comprising: structures; a first sheet affixed to the structure; and a second sheet having a portion overlapping the first sheet and a remaining portion adhered to the structure, wherein, in a portion where the second sheet overlaps the first sheet, a plurality of spaces exist between the first sheet and the second sheet, and The plurality of spaces are separated from each other.

[0096] [Item 10] A repair structure for a structure, comprising: structures; a first sheet affixed to the structure; and a second sheet having a portion overlapping the first sheet and a remaining portion adhered to the structure, In the portion where the second sheet overlaps the first sheet, there is no space between the first sheet and the second sheet.

[0097] [Item 11] A method for repairing or reinforcing a structure with a sheet material, the method comprising: (1) preparing a sheet for construction, the sheet for construction comprising a functional layer and an adhesive layer on the back surface of the functional layer and comprising a land portion and a plurality of recessed portions separated from each other on the front surface of the sheet for construction; and (2) The sheet is adhered to the surface of the structure using the adhesive force of the adhesive layer.

[0098] [Item 12] A method for repairing or reinforcing a structure, the method comprising: (1) preparing a first sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the first sheet and a plurality of recessed portions separated from each other; (2) preparing a second sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the second sheet and a plurality of recessed portions separated from each other; (3) adhering the first sheet to the surface of the structure by using the adhesive force of the adhesive layer of the first sheet; and (4) The second sheet is adhered to the surface of the first sheet and the surface of the structure by the adhesive force of the adhesive layer of the second sheet while overlapping a portion of the second sheet near the edge of the first sheet.

[0099] [Item 13] A method for repairing or reinforcing a structure repaired or reinforced with old sheets, the method comprising: (1) preparing a new sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the new sheet and a plurality of recessed portions separated from each other; and (2) The new sheet is adhered to the broken or deteriorated surface of the old sheet using the adhesive force of the adhesive layer.

[0100] [Industrial Applicability] The sheet for a structure described above can be used in a state of being attached to various objects.

[0101] [reference numerals list] 2 • • • Sheets for structures 2a • • • First sheet 2b • • • Second sheet 4 • • • Functional layer 6 • • • Middle Layer 8 • • • Adhesive layer 10 • • • Reinforcement 12 • • • Roof 18 • • • Step Difference 22 • • • Seams 24 • • • Step Difference 25 • • • Land Department 26 • • • Depression 28 • • • Yarn 28a • • • Warp 28b • • • Weft 30 • • • Grid 32 • • • Sheets for structures 34 • • • Functional layer 36 • • • Middle Layer 38 • • • Adhesive layer 40 • • • Land Department 42 • • • Depression Sb • • • Back surface Sf • • • Front surface Sp • • • Space.

Claims

1. A sheet material for a structure, comprising: Functional layer; as well as An adhesive layer located on the back side of the functional layer, wherein The front surface of the sheet for a structure includes a land portion and a plurality of recessed portions separated from each other.

2. The sheet material for a structure according to claim 1, wherein: An area ratio of the land portion to the recessed portions on the front surface is 20 / 80 or more and 80 / 20 or less.

3. The sheet material for a structure according to claim 1 or 2, wherein: The average area of ​​these depressions is 0.005 mm 2 or larger and 5.0 mm 2 or smaller.

4. The sheet material for a structure according to claim 1 or 2, wherein: The average depth of these recessed portions is 0.005 mm or more and 0.50 mm or less.

5. The sheet material for a structure according to claim 1 or 2, wherein: The average interval between these recessed portions is 0.02 mm or more and 1.0 mm or less.

6. The sheet material for a structure according to claim 1 or 2, wherein: The outline shape of each concave portion is circular, elliptical, or polygonal.

7. The sheet material for a structure according to claim 1 or 2, further comprising: An intermediate layer located between the functional layer and the adhesive layer, wherein The material of the middle layer is a composite material containing a polymer and a filler.

8. The sheet material for a structure according to claim 1 or 2, further comprising: A reinforcement located between the functional layer and the adhesive layer, wherein The reinforcement is a fabric.

9. A repair structure for a structure, comprising: structures; a first sheet affixed to the structure; as well as a second sheet having a portion overlapping the first sheet and a remainder adhered to the structure, wherein In the portion where the second sheet overlaps the first sheet, a plurality of spaces exist between the first sheet and the second sheet, and The plurality of spaces are separated from each other.

10. A repair structure for a structure, comprising: structures; a first sheet affixed to the structure; as well as a second sheet having a portion overlapping the first sheet and a remainder adhered to the structure, wherein In a portion where the second sheet overlaps the first sheet, no space exists between the first sheet and the second sheet.

11. A method for repairing or reinforcing a structure using a sheet material, the method comprising: (1) preparing a sheet for construction, the sheet for construction comprising a functional layer and an adhesive layer on the back surface of the functional layer and comprising a land portion and a plurality of recessed portions separated from each other on the front surface of the sheet for construction; as well as (2) The sheet is adhered to the surface of the structure using the adhesive force of the adhesive layer.

12. A method for repairing or reinforcing a structure, the method comprising: (1) preparing a first sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the first sheet and a plurality of recessed portions separated from each other; (2) preparing a second sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the second sheet and a plurality of recessed portions separated from each other; (3) adhering the first sheet to the surface of the structure by using the adhesive force of the adhesive layer of the first sheet; as well as (4) The second sheet is adhered to the surface of the first sheet and the surface of the structure by the adhesive force of the adhesive layer of the second sheet while overlapping a portion of the second sheet near the edge of the first sheet.

13. A method for re-repairing or re-reinforcing a structure repaired or reinforced with old sheets, the method comprising: (1) preparing a new sheet including a functional layer and an adhesive layer on the back surface of the functional layer and including a land portion on the front surface of the new sheet and a plurality of recessed portions separated from each other; as well as (2) The new sheet is adhered to the broken or deteriorated surface of the old sheet using the adhesive force of the adhesive layer.

Images