Structural protection sheets, construction methods, and protective structures

Abstract

We provide a novel protective sheet for structures. [Solution] The structural protection sheet (10) is formed by laminating an intermediate resin layer (121) containing an inorganic material and a resin layer (122) containing a polyurea resin in that order onto a structure (20), and the intermediate resin layer (121) has at least one layer selected from an adhesive layer (111) and a foamed resin layer (151) on the side facing away from the resin layer (121).

Description

[Technical Field]

[0001] This invention relates to a protective sheet for structures, a construction method, and a protective structure. [Background technology]

[0002] Prior literature 1 describes a concrete repair method in which a concrete repair sheet comprising an intermediate layer having a resin film and a surface layer made of a fabric material laminated on both sides via an adhesive resin is attached to the concrete surface to be repaired with an adhesive, and paint is applied to the surface layer of the attached concrete repair sheet that is opposite to the concrete surface.

[0003] Prior reference 2 describes a method for protecting concrete structures, which involves forming a surface preparation coating film containing a cationic (meth)acrylic polymer emulsion and an inorganic hydraulic substance on the surface of the concrete structure, and then curing a coating film on the surface of the substrate film that is made from a composition containing an emulsion in which an alkyl (meth)acrylate copolymer is emulsified and dispersed in water with a cationic and / or nonionic surfactant, and an inorganic hydraulic substance.

[0004] Prior document 3 describes a surface finishing structure for an ALC exterior wall, in which a surface sheet material is attached to the ALC panel to cover the joint processing area between adjacent ALC panels. This surface sheet material consists of a sheet-like substrate, an intermediate layer mainly composed of inorganic material, and a waterproof coating layer, and small gaps between the edges of the surface sheet material are filled with a waterproof and elastic sealant. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-144360 [Patent Document 2] Japanese Patent Publication No. 2000-16886 [Patent Document 3] Registered Utility Model No. 3009544 (Publication Gazette) [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] While structural protection sheets can provide structures with excellent weather resistance, there is room for improvement in the composition of each layer of these sheets and the materials contained in each layer, and there is a need for novel structural protection sheets with further improvements.

[0007] This disclosure was made to solve the aforementioned problems, and its purpose is to provide a novel structural protection sheet and related technologies. [Means for solving the problem]

[0008] To solve the above problems, a structural protection sheet according to one aspect of the present disclosure is a sheet for protecting a structure, comprising an intermediate resin layer and a resin layer laminated in that order, wherein the intermediate resin layer has at least one layer selected from an adhesive layer and a foamed resin layer on the side facing away from the resin layer, the intermediate resin layer contains an inorganic material, and the resin layer contains a polyurea resin.

[0009] Furthermore, a construction method according to one aspect of the present disclosure is a method for applying a sheet to a structure, and includes the step of bonding a structural protective sheet according to one aspect of the present disclosure to the structure via the adhesive layer.

[0010] Furthermore, a protective structure according to one aspect of the present disclosure is a protective structure for a structure in which a protective laminated structure is formed on the structure, wherein the protective laminated structure is formed by laminating an adhesive layer, an intermediate resin layer, and a resin layer in that order on the structure, the intermediate resin layer contains an inorganic material, and the resin layer contains a polyurea resin. [Effects of the Invention]

[0011] According to one aspect of the present invention, a novel structural protection sheet and related technologies can be provided.

Brief Description of the Drawings

[0012] [Figure 1] FIG. 1 is a cross-sectional configuration diagram for explaining an overview of a structure protection sheet 10 according to one aspect. [Figure 2] FIG. 2 is a schematic diagram of a method for measuring the storage elastic modulus. [Figure 3] FIG. 3 is a graph showing a measurement example of the storage elastic modulus. [Figure 4] FIG. 4 is a schematic diagram showing an example of a reinforcing material 123 included in a structure protection sheet 10 according to one aspect. [Figure 5] FIGS. 5(A), 5(B), 5(C), and 5(D) are schematic diagrams for explaining a method for measuring the rigidity of the structure protection sheet of the present disclosure. [Figure 6] FIG. 6 is a graph showing the relationship between the stroke (mm) of the pressing jig and the test force (N). [Figure 7] FIG. 7 is a schematic diagram showing a 180° peel test method. [Figure 8] FIG. 8 is a graph for showing a method for obtaining the maximum test force in the tensile elastic range based on a tensile test. [Figure 9] FIG. 9 is a graph for showing a method for obtaining the maximum test force in the tensile elastic range based on a tensile test. [Figure 10] It is a schematic diagram showing a state of attaching a structure protection sheet 10 according to one aspect to a structure 21. [Figure 11] It is a schematic diagram showing the structure of a supply article 38 containing a structure protection sheet 10 according to one aspect. [Figure 12] It is a cross-sectional configuration diagram for explaining an overview of a structure protection sheet 11 according to one aspect. [Figure 13] It is a cross-sectional configuration diagram for explaining an overview of a structure protection sheet 12 according to one aspect. [Figure 14] It is a cross-sectional configuration diagram for explaining a construction method of a structure protection sheet 10 according to one aspect and an overview of a protection structure 100. [Figure 15]This is a cross-sectional diagram illustrating a method for constructing a structural protection sheet 10 according to another embodiment, and an outline of the protective structure 101. [Figure 16] This is a cross-sectional diagram illustrating the construction method of a structural protection sheet 11 and the general outline of a protective structure 102 according to one embodiment. [Figure 17] This is a cross-sectional diagram illustrating the construction method of a structural protection sheet 12 and the general outline of a protective structure 103 according to one embodiment. [Figure 18] This is a cross-sectional diagram illustrating a construction method using a laminated sheet 120 according to one embodiment, and the outline of a protective structure 104. [Figure 19] This is a cross-sectional diagram illustrating a construction method using a laminated sheet 120 according to another embodiment, and the outline of a protective structure 105. [Modes for carrying out the invention]

[0013] [Structural protection sheet 10] The structural protection sheet disclosed herein is used for reinforcing or repairing the surface of a structure. Specifically, the surface of a structure is reinforced or repaired by attaching one main surface of the structural protection sheet disclosed herein to the surface of the structure. The structural protection sheet disclosed herein is not limited to structures that have deteriorated or damaged on their surface. By attaching the structural protection sheet disclosed herein to the surface of a structure in advance, deterioration and damage can be prevented. In this disclosure, "adhesion" is intended to include both adhesive and tackiness.

[0014] As shown in Figure 1, a structural protection sheet 10 according to one embodiment comprises an adhesive layer 111, an intermediate resin layer 121, and a resin layer 122 in that order, the intermediate resin layer 121 containing an inorganic material, and the resin layer 122 containing a polyurea resin. The laminated sheet 120 comprises the intermediate resin layer 121 and the resin layer 122. Although Figure 1 schematically shows a structural protection sheet 10 of the first embodiment comprising a single adhesive layer and a single resin layer, the structural protection sheet according to one embodiment is not limited to this and may comprise multiple intermediate resin layers 121 and multiple resin layers 122.

[0015] The thickness of the structural protection sheet 10 is, for example, 10 μm or more, from the viewpoint of imparting various properties to the structural protection sheet 10. The thickness of the structural protection sheet 10 is preferably, for example, 100 μm or more, more preferably 300 μm or more. Furthermore, a value of 500 μm or more is even more preferable, and a value of 600 μm or more is most preferable. Also, for example, the thickness of the structural protection sheet 10 is 10 cm or less. The thickness of the structural protection sheet 10 is preferably, for example, 5 cm or less, more preferably 1 cm or less, and even more preferably 5 mm or less. Furthermore, a value of 1 mm or less is particularly preferable, and a value of 800 μm or less is most preferable.

[0016] Furthermore, from the viewpoint of stably imparting predetermined characteristics to the structural protection sheet 10, the thickness distribution of the structural protection sheet 10 is preferably, for example, within ±10% of the total thickness of the structural protection sheet 10. Having the thickness distribution of the structural protection sheet 10 within this range makes it easier, for example, for even inexperienced workers to stably provide layers with small thickness variations on the surface of the structure. Also, controlling the thickness distribution within this range makes it easier to uniformly reinforce the structure.

[0017] (adhesive layer 111) The structural protection sheet 10 has sufficient adhesion to the structure to obtain weather resistance, while also providing sufficient adhesive strength to allow for repositioning at the construction site. Therefore, it includes an adhesive layer 111 positioned on the application surface, possessing a predetermined level of adhesion, and being applied to the structure. The adhesive layer provided by the structural protection sheet is sometimes referred to as the first adhesive layer.

[0018] The tackiness of the adhesive layer 111 can be controlled, for example, by adjusting the thickness and surface properties of the adhesive layer 111, as well as the material of the adhesive layer 111. When controlling the surface properties of the adhesive layer 111, for example, a microstructure can be employed. Furthermore, setting the thickness of the adhesive layer to an appropriate value that is neither too thick nor too thin is also effective in controlling the tackiness of the adhesive layer 111. In addition, from the viewpoint of making it easier to control the tackiness of the adhesive layer 111 within a predetermined range, it is also preferable to adjust the adhesive material and the thickness of the adhesive layer in combination.

[0019] One example of a method for imparting rigidity to the adhesive layer 111 is to configure the adhesive layer 111 to include an adhesive and a filler. In this case, the adhesive layer 111 includes, for example, an adhesive such as acrylic, silicone with siloxane bonds, rubber, or urethane, which has a relatively low glass transition temperature (Tg) and can utilize van der Waals forces or electrostatic forces, and a filler such as silica, alumina, titanium oxide, calcium carbonate, or carbon black. For example, the rigidity of the adhesive layer 111 can be controlled by adjusting at least one of the amount of filler added to the adhesive layer 111 and the particle shape of the filler. Specifically, examples of filler particle shapes include spherical, needle-shaped, irregular, and tetrapod-shaped. The rigidity of the structural protection sheet 10 can also be controlled by adjusting the Tg of the adhesive.

[0020] If the material of the adhesive layer 111 is rubber, more specifically, a non-diene rubber can be exemplified. Specifically, at least one of the following can be exemplified as a non-diene rubber: CIIR (chlorinated butyl rubber), BIIR (brominated butyl rubber), or EPDM (ethylene propylene rubber).

[0021] The material of the adhesive layer 111 is preferably acrylic, and more preferably composed of an acrylic adhesive. When an acrylic adhesive is used for the material of the adhesive layer 111, it is preferable that the material contains, for example, 1 part by weight or more of an isocyanate crosslinking agent (curing agent) per 100 parts by weight of the acrylic adhesive. Furthermore, it is more preferable that the content of the isocyanate crosslinking agent (curing agent) in the material is, for example, 4 parts by weight or more per 100 parts by weight of the acrylic adhesive. On the other hand, it is preferable that the content of the isocyanate crosslinking agent (curing agent) in the material is, for example, 10 parts by weight or less per 100 parts by weight of the acrylic adhesive. Furthermore, it is more preferable that the content of the isocyanate crosslinking agent (curing agent) in the material is 6 parts by weight or less per 100 parts by weight of the acrylic adhesive. This makes it easier to control the tackiness of the adhesive layer within the range defined in this disclosure. The acrylic adhesive is not particularly limited, and commercially available products can be used. For example, examples include Olivine® BPS6574, BPS6554, and BPS5565K manufactured by Toyo Chem Co., Ltd.

[0022] Furthermore, when using an acrylic adhesive, the material of the adhesive layer 111 preferably contains, for example, 1 part by weight or more of tackifier resin per 100 parts by weight of the acrylic adhesive. On the other hand, the content of the tackifier resin in the material is more preferably 20 parts by weight or less, and even more preferably 10 parts by weight or less, per 100 parts by weight of the acrylic adhesive. This makes it easier to control the tackiness of the adhesive layer within the range defined in this disclosure. In addition, by configuring the structural protection sheet to have multiple (for example, two) adhesive layers and changing the ratio of crosslinking agent (curing agent) in each adhesive layer, the adhesive strength of the adhesive layer 111 can be more easily maintained even with some temperature changes. Examples of tackifier resins include rosin-based tackifier resins, terpene-based tackifier resins, petroleum resin-based tackifier resins, and phenol resin-based tackifier resins.

[0023] The thickness of the adhesive layer 111 is generally 15 μm or more, from the viewpoint of providing sufficient adhesion to the surface of the structure. For example, the thickness of the adhesive layer 111 is preferably 30 μm or more, more preferably 40 μm or more. Furthermore, a value of 50 μm or more is even more preferable, and a value of 70 μm or more is particularly preferable. On the other hand, considering productivity and other factors, the value is generally 180 μm or less. For example, the thickness of the adhesive layer 111 is preferably 170 μm or less, more preferably 160 μm or less. Furthermore, a value of 140 μm or less is even more preferable, and a value of 125 μm or less is most preferable.

[0024] If the adhesive used in the adhesive layer 111 is an acrylic adhesive, for example, it is easy to adjust the adhesive strength to the roof of a structure, and the degree of freedom in material design is high. Furthermore, it has excellent transparency, weather resistance and heat resistance, and the reinforcement or repair of the surface of the structure by the structural protection sheet 10 can be performed more favorably.

[0025] Furthermore, the adhesive surface of the adhesive layer 111 may be configured with a microstructure similar to the limbs of a gecko (a structure with a large surface area that can utilize intermolecular forces), and the surface properties of the adhesive surface may be controlled.

[0026] The storage modulus G' of the adhesive layer 111 at 23±2℃ is, for example, 1 × 10⁻⁶ 3 A value of Pa or higher is preferable, and 1 × 10 4 A value of Pa or higher is preferable, while for example, 1 × 10 6 A value of 1 × 10 is preferable. 5 A value of Pa or less is more preferable. By setting the storage modulus G' of the adhesive layer 111 at 23±2℃ to one of these values, it becomes easier to control the adhesive layer 111 to an appropriate softness. Therefore, in the structural protection sheet 10, it becomes easier to improve handling (for example, making it less likely to shift when attached to a structure) while ensuring adhesive strength.

[0027] The method for measuring the storage modulus G' is described below. Figure 2 is a schematic diagram of the method for measuring the storage modulus G'. A DMAQ850 rheometer DHR-2 (manufactured by T.A. Instruments Japan Co., Ltd.) is used as the viscoelasticity measuring device. If the above-mentioned test device becomes difficult to obtain due to discontinuation of manufacturing, a successor model or an equivalent device capable of measurement may be used.

[0028] Method for preparing and measuring samples: First, an adhesive layer 111 with a thickness of approximately 2 mm is prepared. A sample is prepared by punching this adhesive layer 111 into a 5 mm disc shape. Next, as shown in Figure 2, this punched sample is fixed by sandwiching it between a parallel plate and a lower plate. Then, the punched sample is subjected to vibration at a frequency of 1.0 Hz, and the temperature of the punched sample is changed at a rate of 5 °C / min within a temperature range of -80 °C to 80 °C. The storage modulus G' of the punched sample at this time is measured in shear mode. Here, Figure 3 is a graph showing an example of measurement of the storage modulus G'. Note that in Figure 3, for convenience, an example is shown where the upper limit of the sample temperature range is set to 120 °C.

[0029] (Intermediate resin layer 121) The intermediate resin layer 121 has the function of maintaining the overall shape of the structural protection sheet 10 and is a layer that imparts a predetermined rigidity to the structural protection sheet 10. From the viewpoint of ensuring ease of handling when attaching the structural protection sheet 10 to a structure, it is preferable that the intermediate resin layer 121 has rigidity. This allows, for example, the rigidity to withstand bending to be controlled within a predetermined range.

[0030] The intermediate resin layer 121 preferably includes a composite material of a resin material and a material that imparts rigidity to the structural protection sheet 10. This makes it easier to impart a predetermined rigidity to the structural protection sheet 10. Examples of resin materials included in the intermediate resin layer 121 include acrylic resin, acrylic silicone resin, fluororesin, and silicone resin. The rigidity of the structural protection sheet 10 can also be controlled by adjusting the Tg of the resin components in the intermediate resin layer 121.

[0031] Furthermore, examples of materials that impart rigidity to the structural protection sheet 10 contained in the intermediate resin layer 121 include fillers (inorganic materials). Examples of such fillers include cement, mortar, silica (silicon oxide), alumina, titanium oxide, calcium carbonate, and carbon black. Also, for example, the rigidity of the structural protection sheet 10 can be controlled by adjusting the particle shape of the filler. Specifically, examples of filler particle shapes include spherical, needle-shaped, irregular, and tetrapod-shaped.

[0032] Furthermore, the rigidity of the structural protection sheet 10 can be controlled by adjusting the thickness of the intermediate resin layer 121. Preferably, the intermediate resin layer 121 is composed of a resin component including acrylic and mortar. More preferably, the intermediate resin layer 121 contains polymer cement. More preferably, in addition to mortar, the intermediate resin layer 121 contains silica (silicon oxide) and titanium oxide as fillers. This enhances the ultraviolet shielding ability of the intermediate resin layer 121 and improves the weather resistance of the structural protection sheet 10. By controlling the ratio of the resin component and mortar that make up the intermediate resin layer 121, the rigidity of the structural protection sheet 10 can be easily controlled, and the degree of freedom in material design can be improved. In addition, since a thickness of the intermediate resin layer 121 that is easy to handle can be obtained, the reinforcement or repair of the surface of the structure by the structural protection sheet 10 can be performed more effectively. Furthermore, by controlling the ratio of resin components, mortar, and silica and / or titanium oxide, the rigidity of the structural protection sheet 10, the degree of freedom in material design, and the weather resistance of the structural protection sheet 10 can be improved.

[0033] When using a resin component and a mortar component as the material for the intermediate resin layer 121, the amount of the resin component relative to the total amount of the mixture of the mortar component and the resin component is preferably, for example, 10 parts by weight or more. Furthermore, the amount of the resin component relative to the total amount of the mixture is more preferably, for example, 20 parts by weight or more, even more preferably 30 parts by weight or more, and most preferably 40 parts by weight or more. On the other hand, the amount of the resin component relative to the total amount of the mixture is preferably 90 parts by weight or less, more preferably 80 parts by weight or less, even more preferably 70 parts by weight or less, and most preferably 60 parts by weight or less. This makes it easier to ensure the adhesion of the intermediate resin layer 121 to the resin layer 122 described later, and also makes it easier to impart appropriate rigidity to the structural protection sheet 10. In addition, by replacing 5 to 80 parts by weight of the mortar component with silica and / or titanium oxide, not only the rigidity of the structural protection sheet 10 but also the weather resistance of the structural protection sheet 10, especially the UV shielding effect, can be improved.

[0034] More specifically, the intermediate resin layer 121 may be formed from an intermediate resin layer forming composition containing an acrylic resin, and can be made from Spring Coat (Brush) Mixture manufactured by Kikusui Chemical Industry Co., Ltd., Aronbu Coat A450 Base manufactured by Toagosei Co., Ltd., etc. Furthermore, as the mortar used for the intermediate resin layer 121, can be Spring Coat (Brush) Powder manufactured by Kikusui Chemical Industry Co., Ltd., Aronbu Coat A450 Setter manufactured by Toagosei Co., Ltd., etc. Each of the materials of the intermediate resin layer forming composition and the mortar described above may be used individually or in combination.

[0035] Furthermore, the intermediate resin layer 121 may use a film-like or mesh-like reinforcing material as a material to impart rigidity. This reinforcing material is, for example, placed inside the intermediate resin layer 121. Nonwoven fabric can also be used as the reinforcing material of the intermediate resin layer 121. In this case, the nonwoven fabric is not particularly limited as long as it is a nonwoven fabric formed in a sheet shape without weaving the fibers. Examples of fibers constituting the nonwoven fabric include at least one of natural fibers and chemical fibers. Examples of chemical fibers include fibers made of polyolefin resins such as polypropylene and polyethylene, polyester resins, polyacrylic resins, polyamide resins such as nylon, and synthetic fibers made of copolymers, modified products, and combinations thereof of these resins. In addition, various specific fibers such as aramid fibers, glass fibers, and carbon fibers can be mentioned. Among these, polyester fibers are preferred as they have excellent water resistance, heat resistance, dimensional stability, and weather resistance. The reinforcing material may also be a mesh material such as cheesecloth made of vinylon (for example, for agricultural use), polyester, polyvinyl alcohol, etc. These reinforcing materials 123 make it easier to widen the elastic range of the structural protection sheet 10. However, the reinforcing material of the intermediate resin layer 121 may also be a mesh or foil made of metal materials such as aluminum or steel.

[0036] Here, Figure 4 is a schematic diagram showing an example of a reinforcing material 123 for a structural protection sheet 10 of the present disclosure. The reinforcing material 123 shown in Figure 4 is a material used in the intermediate resin layer 121, and as an example, has a biaxial woven fabric structure in which warp and weft fibers are arranged in a grid pattern. The shape of the reinforcing material 123 is not particularly limited. As for the shape of the reinforcing material 123, in addition to the biaxial woven fabric structure shown in Figure 4, any shape such as a triaxial woven fabric structure can be exemplified. As for the reinforcing material 123, for example, mesh materials such as high-strength vinylon mesh (e.g., for civil engineering applications), vinylon (e.g., for agricultural applications), polyester, polyvinyl alcohol, etc. are preferred. With these reinforcing materials 123, the elastic range of the structural protection sheet 10 can be easily expanded. In addition, it can be easily imparted to the structural protection sheet 10 appropriate rigidity. Furthermore, the handling of the structural protection sheet 10 can be improved.

[0037] For example, the wire pitch of the reinforcing material 123 is preferably between 50 mm and 1.2 mm. In other words, for example, the linear density of the reinforcing material 123 is preferably between 0.2 wires / cm and 8.0 wires / cm. With such a reinforcing material 123, it is possible to easily impart rigidity to the structural protection sheet 10 while ensuring the tensile strength of the structural protection sheet 10.

[0038] The reinforcing material 123 may be sized to cover the entire surface of the intermediate resin layer 121 when viewed from above, or it may be smaller than the intermediate resin layer 121. In other words, the area of ​​the reinforcing material 123 when viewed from above may be equal to or smaller than the area of ​​the intermediate resin layer 121 when viewed from above.

[0039] The area of ​​the reinforcing material 123 when viewed from above (planar area) is preferably 60% to 95% of the planar area of ​​the intermediate resin layer 121. If the planar area of ​​the reinforcing material 123 is 60% or more, for example, it becomes easier to ensure the rigidity of the structural protection sheet 10 and to control the elongation rate of the structural protection sheet 10. It also becomes easier to suppress variations in rigidity in different regions of the structural protection sheet 10. Furthermore, if the planar area of ​​the reinforcing material 123 is 95% or less, for example, if the intermediate resin layer 121 is formed so as to sandwich the reinforcing material 123 in the thickness direction of the structural protection sheet 10, it becomes easier to ensure the adhesive strength of the reinforcing material 123 to the intermediate resin layer 121 throughout the intermediate resin layer 121. The planar area of ​​the reinforcing material 123 can be measured by known methods.

[0040] The thickness of the reinforcing material 123 is, for example, 10% or more of the thickness of the intermediate resin layer 121. The thickness of the reinforcing material 123 is preferably, for example, 20% or more, more preferably 30% or more, particularly preferably 40% or more, and most preferably 50% or more, relative to the thickness of the intermediate resin layer 121. On the other hand, the thickness of the reinforcing material 123 is, for example, 80% or less of the thickness of the intermediate resin layer 121. The thickness of the reinforcing material 123 is preferably, for example, 70% or less, more preferably 60% or less, and particularly preferably 55% or less, relative to the thickness of the intermediate resin layer 121. By setting the thickness of the intermediate resin layer 121 in this way, it is possible to easily impart appropriate rigidity to the structural protection sheet 10.

[0041] Furthermore, by setting the thickness of the reinforcing material 123 and the thickness of the intermediate resin layer 121 to have the aforementioned relationship, the structural protection sheet 10 of this disclosure can be configured to have excellent adhesion between the adhesive layer 111 and the intermediate resin layer 121 and appropriate rigidity. Therefore, excellent handling is obtained when laminating the structural protection sheet 10 to the roof of a structure, and the structure can be protected by the structural protection sheet 10 for a long period of time without wrinkles or gaps between the sheet and the roof of the structure. For example, the lower limit of the thickness of the reinforcing material 123 relative to the thickness of the intermediate resin layer 121 is preferably 45%, and the upper limit of the thickness is preferably 55%.

[0042] For the reinforcing material 123 (mesh component), vinylon mesh material (colour netting, BINEO® "V520") manufactured by Unitika Ltd. can be used.

[0043] From the viewpoint of ensuring the rigidity of the structural protection sheet 10, the thickness of the intermediate resin layer 121 is, for example, 100 μm or more. Preferably, the thickness of the intermediate resin layer 121 is 200 μm or more, more preferably 300 μm or more, and most preferably 350 μm or more. On the other hand, considering productivity and other factors, the thickness of the intermediate resin layer 121 is, for example, 1500 μm or less. Preferably, the thickness of the intermediate resin layer 121 is 1200 μm or less, more preferably 1000 μm or less, and most preferably 750 μm or less. In this way, appropriate rigidity of the structural protection sheet 10 can be obtained by appropriately adjusting the thickness of the intermediate resin layer 121.

[0044] The structural protection sheet 10 preferably has moderate rigidity in order to improve handling (e.g., ease of application) when attaching it to a structure. This makes it easier to improve the handling (e.g., ease of laying) of the structural protection sheet at the construction site. The rigidity of the structural protection sheet can be confirmed by the following deformation test. Specifically, it is determined from the energy calculated in the calculation in (4) below when a deformation test is performed on the structural protection sheet by sequentially performing the operations described in items (1), (2), (3), and (4) below.

[0045] (1) Prepare a rectangular protective sheet for the structure with a short side of 50 mm and a long side of 100 mm as a sample. (2) The sample is curved so that a pair of short sides of the same plane overlap, and a pair of regions of the sample from the edges of the pair of short sides to a position 15 mm away along the long side is gripped and fixed with the fixing part, thereby forming a curved portion with a circumference of 70 mm between the pair of regions of the sample. (3) With the surfaces of the pair of regions of the sample positioned parallel to the vertical direction and the curved portion facing upward, a pressing jig having a disc shape with a pressing surface of 100 mm in diameter and 10 mm in thickness is used, and in an environment with a temperature of 23 ± 2 °C and a humidity of 50 ± 10% RH, the pressing jig is brought into contact with the curved portion from above, and the pressing jig is moved 20 mm downward at a test speed of 30 mm / min. (4) Calculate the energy required to move the pressing jig (movement distance × integral of force).

[0046] Here, the energy in (4) above is calculated based on the following equation (1).

number

[0047] In equation (1), E represents the calculated energy (mJ), F represents the test force (N), and s represents the displacement of the pressing fixture (mm). Figure 6 shows an example of the measurement results. The graph in Figure 6 shows the relationship between the displacement (stroke) (mm) of the pressing fixture and the test force (N) on the vertical axis. The shaded area in Figure 6 represents the energy E.

[0048] Here, Figures 5(A), 5(B), 5(C), and 5(D) are schematic diagrams illustrating a method for measuring the rigidity of a structural protection sheet according to the present disclosure. Figure 5(A) is a front view of the structural protection sheet. Figures 5(B), 5(C), and 5(D) show a curved structural protection sheet viewed from the thickness direction of the structural protection sheet. Specifically, for example, as shown in Figure 5(A), a rectangular structural protection sheet with a short side of 50 mm and a long side of 100 mm is prepared as a sample 19. Then, as shown in Figure 5(B), the sample 19 is curved so that a pair of short sides on the same plane overlap, and a pair of regions of the sample 19 from the edges of the pair of short sides to a position 15 mm away along the long side is gripped and fixed with a fixing part 18. This forms a curved portion with a circumference of 70 mm between the pair of regions of the sample 19 (viewed from the thickness direction of the sample 19).

[0049] Subsequently, as shown in Figures 5(C) and 5(D), with the surfaces of the pair of regions of the sample 19 positioned parallel to the vertical direction and the curved portion facing upward, a pressing jig 17 with a disc shape having a pressing surface of 100 mm in diameter and 10 mm in thickness is used. Under conditions of a temperature of 23±2°C and a humidity of 50±10%RH, the pressing jig 17 is brought into contact with the curved portion from above, and the pressing jig 17 is moved 20 mm downward at a test speed of 30 mm / min.

[0050] Here, it is preferable that the energy required when moving the pressing jig 17 (when moving it 20 mm downward) is 2.0 mJ or more. This makes it easier to impart appropriate rigidity (for example, appropriate stiffness) to the structural protection sheet.

[0051] (Resin layer 122) The resin layer 122 is positioned on the opposite side of the structure's surface and is exposed to the outside. The structural protection sheet 10 may have a single resin layer 122 or multiple resin layers 122, as shown in Figure 1, for example. The number of resin layers in the structural protection sheet 10 is determined considering the overall thickness of the structural protection sheet 10, the functions to be provided (weather resistance, waterproofing, salt resistance, carbonation prevention, water vapor permeability, etc.), the length of the factory's production line, production costs, etc. For example, if a single resin layer 122 with a predetermined thickness cannot be obtained due to a short production line, the resin layer 122 material can be applied in multiple layers to form a protective laminated structure of multiple resin layers 122 with a predetermined overall thickness.

[0052] Preferably, the resin layer 122 is a layer that ensures the weather resistance of the structural protection sheet 10. For example, it is preferable to form the resin layer 122 by applying a paint that is flexible, can follow cracks and fissures that occur in the roof of the structure, and has excellent waterproofing and water vapor permeability.

[0053] The resin layer 122 is a layer that covers the surface of the intermediate resin layer 121, and can also be called the surface resin layer. The material of the resin layer 122 is polyurea resin, and by using polyurea resin, it is possible to provide the structural protection sheet 10 with water vapor permeability while also providing scratch resistance. In addition, this allows moisture contained in the intermediate resin layer 121 of the structural protection sheet 10 to be released from the resin layer 122, thereby preventing a decrease in adhesive strength or the occurrence of blistering in the adhesive layer 111 due to moisture contained in the intermediate resin layer 121.

[0054] The polyurea resin contained in the resin layer 122 is a resin having urea bonds formed by the reaction of an isocyanate compound and an amine compound. The polyurea resin may also have urethane bonds in addition to urea bonds. The isocyanate compound is the main component for producing the polyurea resin. The isocyanate compound preferably has two or more isocyanate groups, and such isocyanate compounds include, for example, known isocyanate compounds such as diphenylmethane diisocyanate (MDI). The amine compound is a curing agent for the isocyanate compound and preferably has two or more amino groups, and such amine compounds include, for example, known amine compounds such as diethylmethylbenzenediamine (DETDA).

[0055] If the polyurea resin has urethane bonds in addition to urea bonds, some of the amine compounds that act as curing agents for the isocyanate compounds can be replaced with, for example, polyol compounds having two or more hydroxyl groups, such as polypropylene glycol (PPG). In addition, the resin layer may contain urethane resin in addition to polyurea resin. The proportion of urethane bonds in the polyurea resin contained in the resin layer is solid. 13 It can be measured by known methods such as 13C nuclear magnetic resonance (NMR).

[0056] The polyurea resin contained in the resin layer 122 has urea bonds and urethane bonds, and the ratio of the number of urethane bonds to the total number of urea bonds and urethane bonds may be greater than 0% and 30% or less, and the proportion of urethane bonds in the polyurea resin is greater than 0% and 30% or less, preferably 5 to 25%, and more preferably 10 to 20%. This makes it possible to increase the compressive strength of the structural protection sheet. The resin layer 122 may also contain other materials, such as plasticizers, reaction catalysts, and pigments, and may contain known additives such as surfactants like defoamers, antioxidants, and ultraviolet absorbers. Examples of additives include radical trapping materials that trap radicals generated by irradiation with energy rays such as ultraviolet (UV), such as hindered amine light stabilizers (HALS).

[0057] As an example of a method for forming the resin layer 122, one can prepare a coating solution by mixing a resin and a solvent, apply the coating solution to a release sheet, and then dry and remove the solvent from the coating film. The solvent may be water or an aqueous solvent, or an organic solvent such as xylene mineral spirits.

[0058] Alternatively, the resin layer 122 may be formed by using a urea resin that has been pre-formed into a sheet and attaching it to the intermediate resin layer 121, which will be described later.

[0059] Furthermore, the resin layer 122 may contain pigments from the viewpoint of providing a wide variety of colors for the structural protection sheet 10. The resin layer 122 may also contain inorganic substances. By containing inorganic substances in the resin layer 122, scratch resistance can be imparted to the resin layer 122. The inorganic substances contained in the resin layer 122 are not particularly limited, and examples include conventionally known materials such as metal oxide particles such as silicon dioxide, aluminum oxide, and titanium dioxide. From the viewpoint of improving the weather resistance while enhancing the scratch resistance of the structural protection sheet 10, silicon dioxide and titanium dioxide, which absorb or reflect ultraviolet rays, are more preferable.

[0060] When the resin layer 122 contains metal oxide particles (which are also inorganic materials), it is preferable that the content of metal oxide particles is in the range of 1 to 50 parts by weight, relative to 100 parts by weight of polyurea resin. If the content of metal oxide particles is 1 part by weight or more, scratch resistance and weather resistance can be improved, and if it is 50 parts by weight or less, these effects can be maintained while ensuring adhesion between the resin layer 122 and the intermediate resin layer 121.

[0061] The resin layer 122 may also contain a known antifouling agent. The structural protection sheet 10 is typically used to reinforce or repair structures installed outdoors. Therefore, the resin layer 122 is often contaminated, but by containing an antifouling agent in the resin layer 122, contamination of the structural protection sheet 10 can be effectively prevented. The antifouling agent contained in the resin layer 122 is not particularly limited, and for example, known materials can be used. The resin layer 122 may also contain additives that can impart various functions to the structural protection sheet 10. Examples of such additives include cellulose nanofibers.

[0062] The thickness of the resin layer 122 can be arbitrarily set depending on the usage form, age, or shape of the structure, such as the roof of the structure. From the viewpoint of ensuring weather resistance, the thickness of the resin layer 122 is, for example, 10 μm or more. The thickness of the resin layer 122 is preferably, for example, 30 μm or more, more preferably 50 μm or more, even more preferably 70 μm or more, and particularly preferably 90 μm or more. In another example, a value of 100 μm or more is even more preferable. On the other hand, considering productivity, for example, the thickness of the resin layer 122 is 500 μm or less. The thickness of the resin layer 122 is preferably, for example, 400 μm or less, more preferably 300 μm or less, and even more preferably 200 μm or less. If the thickness of the resin layer 122 is within any of the above ranges, it is easier to ensure the weather resistance of the structural protection sheet 10 required by this disclosure. Also, from the viewpoint of ensuring weather resistance, it is preferable that there is little variation in the thickness of the resin layer 122. Specifically, the thickness variation of the resin layer 122 is preferably within ±30% of the thickness of the resin layer 122. This level of precision in the thickness of the resin layer 122 can be easily achieved by manufacturing the structural protection sheet 10 on a factory production line.

[0063] In this way, by appropriately adjusting the thickness of the resin layer 122 to any of the above ranges, it is possible to easily adjust the structural protective sheet 10 so that, before being attached to the structure, the structural protective sheet 10 has an adhesive strength such that the measured value of the 180° peel test is 1.5 N / 25 mm or more and is less than 100% of the maximum test force in the tensile elastic range.

[0064] The 180° peel test is evaluated in accordance with JIS Z0237:2022 "Test Methods for Adhesive Tapes and Adhesive Sheets". Test specimens should be prepared in accordance with JIS Z0237:2022 10.1, and the 180° peel test should be performed in accordance with the method described in JIS Z0237 11.5 (Figure 7).

[0065] • 180° Peel Test Method The test will be conducted in accordance with the method described in JIS Z0237 11.5. Specifically, the test method described in 11.5.1 will be carried out using the "test method of peeling the tape and sheet from the stainless steel test plate at a 180° angle" as described in Method 1. The load cell used will be set to 1kN. The test conditions will be set to an environment with a temperature of 23±2℃ and a relative humidity of 50±5%RH.

[0066] Figure 7 is a schematic diagram illustrating the 180° peel test method. In this test, for example, the apparatus with the configuration shown in Figure 7 is used. In Figure 7, the structural protection sheet is shown as a sheet material. As shown in Figure 7, with the lower end of the BASUS board fixed by the first chuck jig, the end of the PET film is pulled upward by the second chuck jig. At this time, the test speed is set to 300 mm / min and the peel length to 100 mm. After the start of measurement, the measurement value for the first 30 mm is ignored. Then, the adhesive strength of the 30 mm length peeled off from the test board is measured multiple times. The multiple measurement values ​​are then averaged. The average value of the obtained measurement values ​​is used as the peel adhesive strength value. The adhesive strength of the 180° peel test is measured using the above procedure.

[0067] The structural protection sheet disclosed herein has an adhesive strength that is less than 100% of the maximum tensile elasticity test force before being applied to a structure. This limits the upper limit of the adhesive strength of the structural protection sheet. Therefore, the handling of the structural protection sheet at the construction site is improved.

[0068] Specifically, even after the structural protection sheet has been attached to the structure, if the attachment is unsuccessful (for example, if it becomes wrinkled), it can be peeled off and reattached. In other words, by setting the upper limit of the adhesive strength to less than 100% of the maximum tensile elasticity test force, the structural protection sheet can be peeled off with a tensile force up to the upper limit of its elastic deformation. By configuring the structural protection sheet to have an adhesive strength that allows it to be peeled off with a force less than 100% of the maximum tensile elasticity test force before being attached to the structure, it is possible to prevent problems such as the structural protection sheet undergoing plastic deformation when peeled off, which reduces its adhesive strength and weather resistance, and also make it easier to reattach and reuse the structural protection sheet.

[0069] From the perspective of ease of removal of the structural protection sheet, the maximum tensile elasticity test force in the state before application to the structure is preferably 90% or less, and more preferably 80% or less. More specifically, if the value is 90% or less, the structural protection sheet can be easily removed manually without using jigs or machinery. If the value is 80% or less, the structural protection sheet can be removed even more easily manually.

[0070] The maximum test force in the tensile elastic region in this disclosure is calculated by the following method. (Method for calculating the maximum test force in the tensile elastic range) • Test specimen size of structural protection sheet Adjust the size to 25mm in width and 100mm in length. • Test equipment The "Autograph AGX-V 10kN" manufactured by Shimadzu Corporation will be used. • Device setting conditions When using the "Autograph AGX-V 10kN" manufactured by Shimadzu Corporation, the load cell should be set to 1kN, and the chuck fixture should be PFG-1kNA.

[0071] • Test conditions (test conditions for tensile testing), test method A structural protection sheet (test specimen) measuring 25 mm in width and 100 mm in length is fixed to both short sides with a chuck fixture. At that time, the portion of the structural protection sheet (test specimen) from the bottom edge up to 25 mm is fixed with the lower chuck fixture, and the portion of the structural protection sheet (test specimen) from the top edge up to 25 mm is fixed with the upper chuck fixture. The distance between the chucks is then set to approximately 50 mm.

[0072] In this state, a preliminary load is applied to the structural protection sheet (test specimen). The preliminary load is applied by moving the upper chuck fixture upward at a speed of 5 mm / min until the load on the test specimen reaches 0.005 N. After that, the upper chuck fixture is moved upward at a test speed of 200 mm / min. At this time, the point where the maximum test force drops by 50% per second is identified as the fracture point. When performing the above preliminary load, the control program of the measuring device can also be used. Specifically, the program should be set to "extend until a load of 0.005 N is applied as a preliminary load" and then to "extend at a test speed of 200 mm / min until the fracture point is reached". • Test environment: Perform the following at 23±2℃ and 50±10% humidity.

[0073] Definition of the tensile elasticity range The tensile elastic region is calculated using the following equation (2) and is defined as the stroke from the first maximum point to the minimum point.

[0074]

number

[0075] • Calculation of the maximum test force in the tensile elastic range The specific method for calculating the maximum test force in the tensile elasticity range will be explained below with reference to Figures 8 and 9. The graph in Figure 8 shows the relationship between stroke (elongation of the test piece) and test force when the structural protection sheet (test piece) is stretched (the upper chuck fixture is moved upward). The upper graph in Figure 9 shows a magnified view of the region between 0 and 2.5 mm on the horizontal axis of the graph in Figure 8 (the area shown in gray in the graph in Figure 8). Furthermore, the lower graph in Figure 9 shows the curve obtained by second differentiation of the upper graph (the graph showing the relationship between stroke and test force). Then, the stroke corresponding to the minimum point in the lower graph (the first minimum point in the same graph) is determined, and the test force corresponding to this stroke is calculated from the upper graph. The test force calculated corresponding to this stroke is 100% of the maximum test force in the tensile elasticity range.

[0076] (Release sheet 140) The release sheet 140 is attached to the side of the adhesive layer 111 opposite to the side with the intermediate resin layer 121. In the structural protection sheet 10, it is preferable that the release sheet 140 is attached before use for the purpose of protecting the surface of the adhesive layer 111. As shown in Figure 1, the release sheet 140 is peeled off when the structural protection sheet 10 is attached to the roof of the structure 21. As shown in Figure 10, the structural protection sheet 10, with the adhesive layer 111 exposed after the release sheet 140 is peeled off, is attached to the roof of the structure 21 by bringing the adhesive layer 111 into contact with the roof of the structure 21.

[0077] The structure of the release sheet 140 is not particularly limited, and for example, a sheet having a support layer and a release layer can be exemplified. Examples of materials constituting the support layer include polyester such as polyethylene terephthalate and polyethylene naphthalate, polyethylene, polypropylene, polyolefin such as polymethylpentene, polyamide such as nylon 6, vinyl resin such as polyvinyl chloride, acrylic resin such as polymethyl methacrylate, cellulose resin such as cellulose acetate, and synthetic resin such as polycarbonate. The support layer may also be formed mainly from paper. Furthermore, the support layer may be a laminate comprising two or more constituent layers.

[0078] Examples of materials that constitute the release layer include silicone resin, melamine resin, and fluorinated polymer. The release layer can be formed, for example, by applying a coating liquid containing the materials that constitute the release layer and an organic solvent onto the support layer using a known coating method such as gravure coating, roll coating, comma coating, or lip coating, and then drying and curing the coating film formed by the coating. In addition, when forming the release layer, the surface of the support layer on which the release layer will be formed may be treated with corona treatment or an easy-adhesion treatment beforehand.

[0079] (Method of manufacturing the structural protection sheet 10) There are no particular limitations on the manufacturing method of the structural protection sheet 10, but examples are given below. First, a coating liquid, which is the material for the resin layer 122, is applied to a predetermined shape-imparting sheet (not shown), which is the base material. Then, the solvent in the coating film formed by the application is removed by heating, or the resin in the coating film is cured, etc. This forms the resin layer 122. Next, a coating liquid, which is the material for the intermediate resin layer 121, is applied on top of the resin layer 122. Then, the solvent in the coating film formed by the application is removed by heating, or the resin in the coating film is cured, etc. This forms the intermediate resin layer 121.

[0080] The shape-imparting sheet is used as a base material in the manufacture of the structural protection sheet 10. The shape-imparting sheet may include resin laminated paper or resin film, which are process papers used in the manufacturing process of the structural protection sheet 10. The resin laminated paper referred to here may have an olefin resin layer such as polypropylene or polyethylene. Specifically, a PP laminated sheet can be used as the shape-imparting sheet. The thickness of this PP laminated sheet is, for example, 50 μm to 200 μm.

[0081] Apart from the formation of the intermediate resin layer 121, a coating liquid, which is the material for the adhesive layer 111, is applied to the release sheet 140. Then, the solvent in the coating film formed by the application is removed by heating, or the resin in the coating film is cured. This forms the adhesive layer 111. After that, the adhesive layer 111 and the intermediate resin layer 121 are joined together to form a joint. The shape-forming sheet is peeled off from this joint, and the adhesive layer 111 is bonded to the intermediate resin layer 121 side. The structural protection sheet 10 is then manufactured.

[0082] A more specific method for manufacturing the structural protection sheet 10 is described below. First, a coating liquid, which is the material for the resin layer 122, is applied to a pre-prepared shape-forming sheet. Then, the solvent in the coating film formed by the application is dried and removed to form the resin layer 122.

[0083] Next, a coating liquid, which is the material for the intermediate resin layer 121, is applied to the upper surface of the resin layer 122. At this time, if necessary, a reinforcing material 123 such as a mesh, film, or foil may be inserted into the applied coating liquid. After that, the intermediate resin layer 121 may be formed by drying and removing the solvent in the coating film formed by the above application.

[0084] On the other hand, the coating liquid, which is the material for the adhesive layer 111, is applied onto the release sheet 140. Then, the solvent in the coating film formed by the application is dried and removed to form the adhesive layer 111. After that, the adhesive layer 111 is superimposed on the intermediate resin layer 121 and adhered to it. Then, the shape-imparting sheet is peeled off from the resin layer 122. The structural protection sheet 10 is then manufactured.

[0085] [Roll-shaped structural protective sheet] As shown in Figure 11, the structural protection sheet 10 can form a roll 26. The structural protection sheet 10 disclosed herein possesses the rigidity described above, while also having appropriate flexibility. For example, the structural protection sheet has enough flexibility to be wound into a roll. Here, "winding into a roll" refers to winding the structural protection sheet onto a roll core material having a diameter of several centimeters to several tens of centimeters (specifically, for example, a diameter of 10 mm to 300 mm). Even with a thinner roll core material, it is possible to wind up several meters of the structural protection sheet by hand or other means. Therefore, for example, the structural protection sheet can be managed in a roll. Furthermore, it is possible to unfold the rolled structural protection sheet at the construction site, cut the sheet to a predetermined size, and quickly prepare and install it. Therefore, the structural protection sheet can be easily and simply applied even to construction targets with relatively large areas.

[0086] When using the structural protection sheet 10 of the present disclosure, for example, the supply article 38 shown below can be used. Figure 11 is a schematic diagram showing the structure of a supply article 38 containing the structural protection sheet 10 of the present disclosure. The supply article 38 shown in Figure 11 comprises a roll body 26 around which a strip-shaped structural protection sheet 10 is wound, and a container 27 having a storage space 27a for housing the roll body 26. The container 27 has a supply opening 27b that allows the structural protection sheet 10 to be unwound and supplied to the outside from the roll body 26 housed in the storage space 27a. The supply opening 27b has a width dimension equal to or greater than the width dimension of the structural protection sheet 10 in the axial direction of the roll body 26.

[0087] For example, a worker can bring the supply item 38 to the construction site, unwind the required length of the structural protection sheet 10 from the supply item 38, and use the structural protection sheet 10 for construction. Therefore, the supply item 38 allows the structural protection sheet 10 to be stored in a roll 26 suitable for storage. Furthermore, when using the structural protection sheet 10, only the required amount can be unwound from the supply item 38. Thus, work efficiency can be improved.

[0088] Furthermore, when the worker feeds out the structural protection sheet 10 from the supply port 27b, for example, by feeding out the structural protection sheet 10 while pressing the entire widthwise area of ​​the structural protection sheet 10 against the opening edge of the supply port 27b, the structural protection sheet 10 can be fed out while applying uniform tension to the entire widthwise area of ​​the structural protection sheet 10. This allows the structural protection sheet 10 to be attached to the surface of the structure 21 with uniform tension. Therefore, it is possible to prevent unexpected shrinkage or expansion of the structural protection sheet 10 after attachment due to uneven tension acting on the structural protection sheet 10. In order to apply uniform tension to the entire widthwise area of ​​the structural protection sheet 10, for example, a separate member such as a long member that extends in the widthwise direction of the structural protection sheet 10 and contacts the structural protection sheet 10 may be placed at the opening edge of the supply port 27b.

[0089] [Structure] The structures to which the structural protection sheet 10 of this disclosure is applied are not particularly limited. Examples of structures include concrete, wooden, and steel structures. From the perspective of peeling off and reapplying the structural protection sheet after it has been applied at the construction site, examples of structures include house roofs, walls, eaves, fences, gateposts, gates, and gate roofs. Such structures have more complex shapes than large structures such as bridge girders, and there is a risk of wrinkles forming in the structural protection sheet. For this reason, it is often difficult to apply the structural protection sheet properly in a single application. Therefore, the technical concept of this disclosure is easily applicable to such structures. The following will further explain the structure using a roof as an example.

[0090] Examples of structures include ordinary houses, as well as large structures such as gymnasiums, hospitals, and public facilities. The structural protection sheet disclosed herein can be suitably attached to the roofs of such structures, for example. The shape of the roof is not particularly limited. Examples of roofs include gable roofs, hip roofs, pyramidal roofs, flat roofs, shed roofs, curved roofs, and arched roofs, among others.

[0091] Furthermore, specific examples of roofs include, for example, slate roofs, roofs made of galvalume steel sheets (registered trademark), corrugated iron roofs (roofs made of galvanized steel sheets), metal roofs with paint applied to iron, and concrete roofs, including flat roofs. Slate comprises a cement layer, an inorganic decorative (cement) layer placed on the cement layer, an inorganic colored stone layer placed on the inorganic decorative layer, and an inorganic coating film placed on the inorganic colored stone layer. Slate is widely used as a roofing material for general houses because of its simple appearance, wide range of colors, lightness, and low cost. However, slate roofs are more prone to cracking than roofs made of galvalume steel sheets (registered trademark), etc., and have lower durability and waterproofing properties compared to roofs made of other materials. Therefore, problems such as damage are more likely to occur. Accordingly, slate roofs are particularly suitable as roofs to which the structural protection sheet of this disclosure is attached. In the following description, the roof of a structure will also be referred to as "slate roof, etc."

[0092] The surface of the roof may have steps or unevenness, similar to those found on typical slate roofs. Preferably, the structural protection sheet of this disclosure has a specific rigidity. When this structural protection sheet is applied to the roof of a structure, even if the roof is, for example, a slate roof with uneven surfaces, it is possible to prevent gaps from forming.

[0093] Furthermore, by applying the structural protection sheet of this disclosure to the roof of a structure, the sheet can be made to follow cracks and expansions that occur in the roof of the structure. This provides the exceptional effect of 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 aforementioned flat roofs, which are materials that tend to accumulate rainwater, the ability to expel water vapor is highly effective in preventing material deterioration.

[0094] [Structural protection sheet 11] A structural protection sheet according to one aspect of this disclosure is not limited to the above-described aspect. As shown in Figure 12, for example, a structural protection sheet 11 according to one aspect has an adhesive layer 111 having a surface facing away from the resin layer 122, and a foamed resin layer 151 is laminated on that surface. For members having the same function as the members shown in Figure 1, the same reference numerals are used, and their descriptions are omitted.

[0095] The structural protection sheet 11 may be a sheet formed by attaching a foamed resin layer 151 to the adhesive layer 111 provided on the structural protection sheet 10.

[0096] The foamed resin layer 151 of the structural protection sheet 11 has irregularities on the surface facing away from the adhesive layer 111. The irregularities of the foamed resin layer 151 of the structural protection sheet 11 are pre-formed so that they can be fitted into the irregularities of structures such as slate roofs and flat roofs. The structural protection sheet 11 can protect structures with irregularities by fitting it into the irregularities of the structure. In another embodiment, the irregularities of the structure and the structural protection sheet 11 may be fitted together via the adhesive layer 111 or another adhesive layer 112, or further, via a primer layer and the adhesive layer 111 or adhesive layer 112. The foamed resin layer 151 with irregularities in the structural protection sheet 11 simplifies the formation of the protective structure during on-site construction. In addition, the presence of the foamed resin layer 151 in the structural protection sheet 11 can increase the strength of the structure, such as a roof, that is the target of the protection.

[0097] The foamed resin layer 151 is a layer of resin having a foamed structure, such as foamed polystyrene resin and foamed urethane resin. Foamed polystyrene resin and foamed urethane resin are preferred because they can particularly increase the strength of the structure to be protected, such as a roof. Furthermore, the foamed resin layer 151 (and the foamed resin layer 152 described later) may contain, for example, a flame retardant, and may also contain given components such as ultraviolet absorbers and antioxidants, which are examples of components contained in the resin layer 122.

[0098] Furthermore, the foamed resin layer 151 may have a primer layer (not shown) on the surface to which the adhesive layer 111 is attached, thereby improving the adhesion between the foamed resin layer 151 and the adhesive layer 111.

[0099] [Structural protection sheet 12] A structural protection sheet according to one aspect of this disclosure is not limited to the above-described aspect. As shown in Figure 13, for example, a structural protection sheet 12 according to one aspect comprises a foamed resin layer 151 between an adhesive layer 111 and an intermediate resin layer 121.

[0100] The structural protection sheet 12 has an adhesive layer 111 formed on the uneven surface of the foamed resin layer 151 that is attached to the structure. This allows the structural protection sheet 12 to be attached to the structure by the adhesive layer 111 while fitting the uneven surface of the foamed resin layer 151 of the structural protection sheet 12 into the uneven surface of the structure such as a slate roof or flat roof. This further simplifies the formation of the protective structure during on-site construction. A primer layer (not shown), described later, may be provided on the surface of the foamed resin layer 151 where the uneven surface is located, thereby improving the adhesion between the foamed resin layer 151 and the adhesive layer 111.

[0101] [Installation method for structural protective sheets] The following describes a construction method according to one aspect of this disclosure. As shown in Figure 14, the construction method according to one aspect is a method for applying a sheet to a structure, and includes the step of bonding the structural protection sheet 10 to the structure 22 via an adhesive layer 111. This makes it possible to form a protective structure 100 that protects the structure 22 with a protective laminated structure comprising an adhesive layer 111, an intermediate resin layer 121, and a resin layer 122.

[0102] The method for installing the structural protection sheet 10 may include the steps of applying a primer to the surface of the structure 22 to be installed to form a primer layer (not shown), and after the primer layer has been formed, the structural protection sheet 10 being bonded onto the primer layer.

[0103] When applying the structure protection sheet 10 of the present disclosure, a primer layer containing a curable resin material may be previously formed on the surface of the structure 22. Physical properties required for the primer layer include, for example, excellent initial adhesiveness to the structure protection sheet 10 to be adhered, long-term adhesiveness enabling long-term storage, blocking property capable of firmly fixing the coating film on the deteriorated structure surface to prevent the scattering of harmful substances from the deteriorated structure during re-adhesion, curability to cure in a short time, pot life ensuring fluidity for a certain period of time, and paint workability that does not require strict mixing work at the work site, etc.

[0104] The material of the primer layer is not particularly limited as long as the required physical properties can be obtained. For example, there is no particular limitation as long as it is a material having the property of forming a resin by curing by moisture curing, heat curing, photo-curing or other methods. Examples of such materials include resins such as acrylic resin, polyester resin, urethane resin, epoxy resin, and silicone resin, and urethane resin is preferably used as the material of the primer layer. For example, those containing the reaction product of an isocyanate compound and a raw material compound such as polyether are preferred.

[0105] The primer layer is generally used as an undercoat for the structure 22. In the present disclosure, it may be applied to the surface of the structure 22. The undercoat can be constructed by ordinary methods. For example, a primer layer as an undercoat can be obtained by applying a paint to the surface of the structure 22 by a general method such as applying it with a brush or a roller, or spraying it with a spray gun, etc., to form a coating film.

[0106] The thickness of the primer layer is, for example, 800 g / m in the wet state 2 The following values. The thickness of the primer layer is, for example, 700 g / m in the wet state 2 The following values are preferred, and 600 g / m 2 The following values are more preferred, and 500 g / m 2 The following values are even more preferred. In particular, the thickness of the primer layer is, for example, 400 g / m in the wet state2 The following values ​​are preferable because they allow for stable adhesion of the structural protection sheet 10 to the surface of the structure under various conditions. Here, "wet state" refers to the state before the coating liquid dries, and the above values ​​indicating the wet state refer to the coating weight.

[0107] The structural protection sheet 10 disclosed herein has excellent adhesive strength. Therefore, when applied to the surface of a structure 21, such as a roof, the structural protection sheet 10 can be applied without gaps even to surfaces with unevenness in the roof or cracks caused by deterioration of the structure 22. By applying the structural protection sheet 10, it is possible to prevent water from entering the structure 21 from the outside, and to prevent the intrusion of deterioration factors such as saltwater and oxygen that cause rust, for several decades. Therefore, the deterioration of the structure 22 can be appropriately suppressed. Furthermore, the structural protection sheet 10 can be installed simply by applying it to the surface of the structure 22. Therefore, it can be installed regardless of the worker's skill, resulting in shorter construction periods and reduced labor costs.

[0108] The structural protection sheet 10 may be used in a state where two or more layers are stacked. In this case, a protective structure for a structure is obtained, comprising a laminate having a plurality of structural protection sheets 10 arranged in the thickness direction, and a structure on which the laminate is arranged. In this case, a plurality of structural protection sheets 10 of any aspect of the disclosure described herein are applied to the laminate.

[0109] In this case, the surface of a structure can be further protected by the structural protection sheets 10 by placing another structural protection sheet 10 on top of the surface of a structure protected by one structural protection sheet 10. In this laminate, for example, a part of another structural protection sheet 10 may be placed on top of at least a part of one structural protection sheet 10. In other words, for example, the end of another structural protection sheet 10 may be placed on top of the end of one structural protection sheet 10. Alternatively, for example, the entire structure protection sheet 10 may be placed on top of the entire structure protection sheet 10. In addition, in the laminate, multiple structural protection sheets 10 may be attached to each other.

[0110] For example, as shown in Figure 15, the construction of the structural protection sheet 10 may include a step of forming a foamed resin layer 152 on the structure 22 before the step of bonding the structural protection sheet 10 to the structure 22. This allows the foamed resin layer 152 to fill in the irregularities of the structure 22, and a protective structure 101 can be formed to protect the structure 22 with a protective laminated structure comprising a foamed resin layer 152, an adhesive layer 111, an intermediate resin layer 121, and a resin layer 122.

[0111] By forming a foamed resin layer 152 on the structure 22, cracks and other damage caused by deterioration of the surface of the structure 22 can be filled and repaired by the foamed resin layer 152. The foamed resin layer 152 is a layer of resin having a foamed structure, such as foamed polystyrene resin and foamed urethane resin. Similar to the foamed resin layer 151, foamed polystyrene resin and foamed urethane resin are preferred because they can particularly increase the strength of the structure to be protected, such as a roof. Foamed urethane resin is preferred because it can particularly increase the strength of the roof after repair. As such a foamed urethane resin, an environmentally friendly non-CFC foamed urethane resin that does not cause global warming is desirable. Examples of non-CFC foamed urethane resins include rigid foamed urethane resins prepared from polyols and isocyanates. The foamed resin layer 152 is formed, for example, by coating the structure 22 with a composition containing a urethane resin containing a foaming agent.

[0112] For example, the construction method for the structural protection sheet 10 shown in Figure 15 may include a step of forming a primer layer (not shown). The step of forming the primer layer (not shown) may be performed by applying a primer to the surface of the structure 22 to be constructed, and after forming the primer layer, a foamed resin layer 152 may be formed on the primer layer. Alternatively, a primer layer (not shown) may be formed on the adhesion surface of the foamed resin layer 152 formed on the structure 22 to the structural protection sheet 10. This improves the adhesion between the structure 22 and the foamed resin layer 152, and the adhesion between the foamed resin layer 152 and the adhesive layer 111 of the structural protection sheet 10.

[0113] The construction method according to one aspect of this disclosure is not limited to the above-described aspect. For example, as shown in Figure 16, the method includes a step of bonding the structural protection sheet 11 to the structure via an adhesive layer 112 separate from the adhesive layer 111. This allows the foamed resin layer 151 to fit into the irregularities of the structure 22, forming a protective laminated structure in which the foamed resin layer 151 is bonded to the adhesive layer 111 of the adhesive layer 112, the intermediate resin layer 121, and the resin layer 122, and a protective structure 102 that protects the structure 22 with the protective laminated structure. Furthermore, the adhesion can be improved by providing the adhesive layer 112. However, whether or not to form the adhesive layer 112 on the structure 22 can be selected depending on whether the foamed resin layer provided on the structural protection sheet is cured or not.

[0114] In the method for installing the structural protection sheet 11, it is preferable to form an adhesive layer 112 on the structure 22. The adhesive layer 112 can be exemplified by an adhesive containing a resin such as acrylic resin, polyester resin, urethane resin, epoxy resin, or silicone resin, and, like the foamed resin layer 152, examples include foamed polystyrene resin and foamed urethane resin. It is more preferable that the adhesive layer 112 be formed by an adhesive capable of forming a layer of resin having a foamed structure. By having an adhesive layer 112 that has a foamed structure brought about by a foaming agent, the structural protection sheet 11 can be attached to the structure 22 by filling the gaps that occur when the irregularities of the foamed resin layer 151 in the structural protection sheet 11 and the irregularities of the structure 22 are fitted together with the adhesive layer 112.

[0115] For example, the construction method for the structural protection sheet 11 shown in Figure 16 may include a step of forming a primer layer (not shown). The step of forming the primer layer (not shown) may be performed by applying a primer to the surface of the structure 22 to be constructed, and after forming the primer layer, an adhesive layer 112 may be formed on the primer layer. Alternatively, the primer layer (not shown) may be formed on the surface of the foamed resin layer 151 of the structural protection sheet 11 that has irregularities. This is preferable to improve the adhesion between the structure 22 and the adhesive layer 112, and between the adhesive layer 112 and the foamed resin layer 151 of the structural protection sheet 11.

[0116] The construction method according to one aspect of this disclosure is not limited to the above-described aspect. For example, as shown in Figure 17, the method includes a step of bonding the structural protection sheet 12 to the structure 22 via an adhesive layer 111, thereby forming a protective structure 103 that protects the structure 22 by fitting the foamed resin layer 151 into the irregularities of the structure 22, and by having the foamed resin layer 151 bonded to the adhesive layer 111 of the adhesive layer 112, intermediate resin layer 121, and resin layer 122. Thus, the structure 22 can be reinforced while significantly simplifying the work process in on-site construction.

[0117] For example, the construction method for the structural protection sheet 12 shown in Figure 17 may include a step of forming a primer layer (not shown). The step of forming the primer layer (not shown) may be performed by applying a primer to the surface of the structure 22 to be constructed, and after forming the primer layer, the adhesive layer 111 of the structural protection sheet 12 may be attached to the primer layer.

[0118] The construction method according to one aspect of this disclosure is not limited to the above-described aspect. For example, as shown in Figure 18, the construction method according to one aspect may be a method of applying a structural protection sheet 13 to a structure 22, wherein a foamed resin layer 151 is formed on the surface of the intermediate resin layer 121 that is backward from the resin layer 122. By attaching the structural protection sheet 13 to the structure 22 via an adhesive layer 112, a protective structure 104 having a protective laminated structure comprising an adhesive layer 112, a foamed resin layer 151, an intermediate resin layer 121, and a resin layer 122 can be formed. The structural protection sheet 13 may have a shape that conforms to the uneven shape of the structure 22 in advance, similar to the foamed resin layer 151 of the structural protection sheet 11 shown in Figure 12.

[0119] A protective laminated structure can be formed by fitting the irregularities of the foamed resin layer 151 in the structural protective sheet 13, which comprises an adhesive layer 112, an intermediate resin layer 121, and a resin layer 122, with the foamed resin layer 151 attached to the adhesive layer 111, into the irregularities of the structure 22. This protective laminated structure allows for the formation of a protective structure 103 that protects the structure 22. Therefore, the work process in on-site construction can be greatly simplified.

[0120] For example, in one embodiment of the construction method, as shown in Figure 19, the structure 23 may be a structure having a wavy, uneven surface in a side view, such as a slate roof. In one embodiment of the construction method, the shape of the foamed resin layer 151 or 152 of the protective structure 105 can be designed according to the shape of the structure. For example, a structural protective sheet 14 may be formed by forming a foamed resin layer 151 with pre-existing irregularities on the surface of the laminated sheet 120 on the intermediate resin layer 121 side, and the structural protective sheet 14 may be attached to the structure 23 via an adhesive layer 112, thereby forming a protective laminated structure on the structure 23. Alternatively, for example, a foamed resin layer 152 may be formed on the surface of the laminated sheet 120 on the intermediate resin layer 121 side, and the foamed resin layer 152 may be attached to the structure 23 before it hardens. This allows the structural protective sheet 14 to be attached to the structure 23 in such a way that the foamed resin layer 152 conforms to the uneven shape of the structure 23. When the foamed resin layer 152 is attached to the structure 23 before it hardens, for example, the formation of the adhesive layer 112 on the structure 23 can be omitted. In other words, the structural protective sheet 14 can be configured to either have an adhesive layer 112 formed on the structure 23, depending on whether it has a foamed resin layer 151 that has been pre-cured into a predetermined shape, or a foamed resin layer 152 that is in an uncured state.

[0121] [Protection structure] One embodiment of the protective structure 100-105 is a protective structure for a structure comprising a structure 22 or 23, an intermediate resin layer 121 containing an inorganic material laminated to the structure 22 or 23 via an adhesive layer 111 or adhesive layer 112, and a resin layer 122 containing a polyurea resin located on the opposite side of the intermediate resin layer 121 from the adhesive layer 111, wherein a foamed resin layer 151 or 152 made of foamed resin is provided between the structure 22 or 23 and the adhesive layer 111 or adhesive layer 112. As a result, the protective structure 100-105 can appropriately suppress the deterioration of the structure to be constructed. Therefore, a protective structure to which a structural protective sheet 10, 11, 12, 13, or 14 according to one embodiment is attached is also within the scope of the present invention. In addition, in the protective structure, whether or not an adhesive layer (another adhesive layer) is formed on the structure may be selected depending on whether the foamed resin layer has hardened or not during the process of attaching the sheet included in the construction method.

[0122] The protective structure is a protective laminated structure formed on a structure to protect the structure. Here, the protective laminated structure comprises an intermediate resin layer and a resin layer, the intermediate resin layer containing an inorganic material and the resin layer containing a polyurea resin. Furthermore, the protective laminated structure comprises at least one layer selected from an adhesive layer and a foamed resin layer between the structure and the intermediate resin layer. This protective laminated structure can be successfully formed using a structural protective sheet, or it can be formed using a laminated sheet (which can also be called a base sheet) comprising an intermediate resin layer and a resin layer.

[0123] [summary] A structural protection sheet according to Embodiment 1 of the present disclosure is a sheet for protecting a structure, comprising an intermediate resin layer and a resin layer laminated in that order, wherein the intermediate resin layer has at least one layer selected from an adhesive layer and a foamed resin layer on the side facing away from the resin layer, the intermediate resin layer contains an inorganic material, and the resin layer contains a polyurea resin.

[0124] In the structural protection sheet according to Embodiment 2 of this disclosure, it is more preferable that a foamed resin layer is provided between the adhesive layer and the intermediate resin layer in Embodiment 1.

[0125] In the structural protective sheet according to aspect 3 of this disclosure, it is more preferable that, in aspect 1, the adhesive layer has a surface facing away from the resin layer, and a foamed resin layer is laminated on that surface.

[0126] The structural protection sheet according to Embodiment 4 of this disclosure may be rollable in any of Embodiments 1 to 3.

[0127] In the structural protection sheet according to aspect 5 of this disclosure, it is more preferable that the inorganic material is a cement component in any of aspects 1 to 4.

[0128] The construction method according to aspect 6 of this disclosure is a method for applying a structural protection sheet according to aspect 1 to a structure, and includes the step of bonding the structural protection sheet to the structure via the adhesive layer.

[0129] The construction method according to aspect 7 of this disclosure may include, in aspect 6, a step of forming a foamed resin layer on the structure or on the surface of the adhesive layer facing away from the resin layer, before the bonding step.

[0130] The construction method according to aspect 8 of this disclosure includes the step of attaching the structural protection sheet according to aspect 2 to the structure via the adhesive layer.

[0131] The construction method according to aspect 9 of this disclosure includes the step of bonding the structural protection sheet according to aspect 3 to the structure via an adhesive layer different from the adhesive layer.

[0132] In the construction method according to aspect 10 of this disclosure, it is preferable that the other adhesive layer has a foamed structure in aspect 9.

[0133] A construction method according to aspect 11 of the present disclosure is a method for constructing a sheet onto a structure, comprising the steps of forming a foamed resin layer on the surface of the intermediate resin layer of a laminated sheet comprising an intermediate resin layer and a resin layer that is reversed from the resin layer, and forming a protective laminate structure on the structure by attaching the foamed resin layer to the structure via an adhesive layer, wherein the intermediate resin layer contains an inorganic material and the resin layer contains a polyurea resin.

[0134] A construction method according to aspect 12 of the present disclosure is a method for constructing a sheet onto a structure, comprising the steps of forming a foamed resin layer on the structure and forming a protective laminate structure on the structure by attaching a laminated sheet comprising an intermediate resin layer and a resin layer to the foamed resin layer via an adhesive layer, wherein the intermediate resin layer contains an inorganic material and the resin layer contains a polyurea resin.

[0135] The construction method according to aspect 13 of the present disclosure more preferably includes a step of providing a primer layer between the structure and the adhesive layer, and between the adhesive layer and the foamed resin layer, in any of aspects 7 to 12.

[0136] The construction method according to aspect 14 of this disclosure more preferably includes a step of providing a primer layer between the structure and the other adhesive layer, and between the other adhesive layer and the foamed resin layer, in aspect 9 or 10.

[0137] A protective structure according to aspect 15 of the present disclosure is a protective structure for a structure in which a protective sheet for the structure is attached to the structure, wherein the protective sheet for the structure is laminated with respect to the structure in the order of an adhesive layer, an intermediate resin layer, and a resin layer, the intermediate resin layer contains an inorganic material, and the resin layer contains a polyurea resin.

[0138] In the protective structure according to aspect 16 of this disclosure, the foamed resin layer is preferably provided between the structure and the adhesive layer in aspect 15.

[0139] In the protective structure according to aspect 17 of this disclosure, the foamed resin layer is preferably provided between the adhesive layer and the intermediate resin layer in aspect 15.

[0140] In the protective structure according to aspect 18 of the present disclosure, it is preferable that, in aspect 16, an adhesive layer other than the adhesive layer is provided between the structure and the foamed resin layer.

[0141] In the protective structure according to aspect 19 of this disclosure, it is more preferable that the other adhesive layer has a foamed structure in aspect 18.

[0142] In the protective structure according to aspect 20 of the present disclosure, it is more preferable that a primer layer is provided between the structure and the adhesive layer, and between the adhesive layer and the foamed resin layer, as in aspects 16 to 19.

[0143] In the protective structure according to aspect 20 of the present disclosure, it is more preferable that, in aspect 19, a primer layer is provided between the structure and the other adhesive layer, and between the other adhesive layer and the foamed resin layer, at least one of these.

[0144] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Industrial applicability]

[0145] This invention can be used in protective sheets for structures. [Explanation of symbols]

[0146] 10,11,12,13,14 Structural protection sheet 100,101,102,103,104,105 Protective structure 111 Adhesive layer 112 Adhesive layer (another adhesive layer) 121 Intermediate resin layer 122 Resin layer 123 Reinforcement material (intermediate resin layer) 140 release sheets 151,152 Foamed resin layer 21, 22, 23 Structures (roofs, protective structures)

Claims

1. A sheet for protecting structures, The intermediate resin layer and the resin layer are laminated in this order, and the intermediate resin layer has at least one layer selected from an adhesive layer and a foamed resin layer on the side facing away from the resin layer. The aforementioned intermediate resin layer contains an inorganic material, A structural protective sheet comprising the aforementioned resin layer containing polyurea resin.

2. The structural protective sheet according to claim 1, further comprising a foamed resin layer between the adhesive layer and the intermediate resin layer.

3. The structural protective sheet according to claim 1, wherein the adhesive layer has a surface facing away from the resin layer, and a foamed resin layer is laminated on that surface.

4. A structural protective sheet according to any one of claims 1 to 3, which can be easily wound into a roll.

5. The structural protective sheet according to any one of claims 1 to 3, wherein the inorganic material is a cement component.

6. A method for installing a sheet on a structure, A construction method comprising the step of bonding the structural protective sheet described in claim 1 to the structure via the adhesive layer.

7. The construction method according to claim 6, further comprising the step of forming a foamed resin layer on the structure or on the surface of the adhesive layer facing away from the resin layer, prior to the bonding step.

8. A construction method comprising the step of bonding the structural protective sheet described in claim 2 to the structure via the adhesive layer.

9. A construction method comprising the step of bonding the structural protective sheet described in claim 3 to the structure via an adhesive layer other than the adhesive layer.

10. The construction method according to claim 9, wherein the other adhesive layer has a foamed structure.

11. A method for installing a sheet on a structure, A step of forming a foamed resin layer on the surface of the intermediate resin layer facing away from the resin layer of a laminated sheet comprising an intermediate resin layer and a resin layer, The process includes the step of forming a protective laminate structure on the structure by attaching the foamed resin layer to the structure via an adhesive layer, The aforementioned intermediate resin layer contains an inorganic material, A construction method wherein the aforementioned resin layer contains polyurea resin.

12. A method for installing a sheet on a structure, A process of forming a foamed resin layer on a structure, The process includes forming a protective laminate structure on the structure by attaching a laminated sheet comprising an intermediate resin layer and a resin layer to the foamed resin layer via an adhesive layer, The aforementioned intermediate resin layer contains an inorganic material, A construction method wherein the aforementioned resin layer contains polyurea resin.

13. The construction method according to any one of claims 7 to 12, comprising the step of providing a primer layer between the structure and the adhesive layer, and between the adhesive layer and the foamed resin layer, at least one of these.

14. The construction method according to claim 9 or 10, comprising the step of providing a primer layer between the structure and the other adhesive layer, and between the other adhesive layer and the foamed resin layer, at least one of these.

15. A protective structure for a structure in which a protective laminated structure is formed on the structure, The protective laminated structure is formed by laminating an adhesive layer, an intermediate resin layer, and a resin layer in that order relative to the structure. The aforementioned intermediate resin layer contains an inorganic material, A protective structure for a structure, wherein the aforementioned resin layer contains polyurea resin.

16. The protective structure for a structure according to claim 15, wherein a foamed resin layer is provided between the structure and the adhesive layer.

17. The protective structure for a structure according to claim 15, wherein a foamed resin layer is provided between the adhesive layer and the intermediate resin layer.

18. The protective structure for a structure according to claim 16, wherein an adhesive layer other than the adhesive layer is provided between the structure and the foamed resin layer.

19. The protective structure for a structure according to claim 18, wherein the other adhesive layer has a foamed structure.

20. A protective structure for a structure according to any one of claims 16 to 19, wherein a primer layer is provided between the structure and the adhesive layer, and between the adhesive layer and the foamed resin layer, at least one of these.

21. A protective structure for a structure according to claim 19, wherein a primer layer is provided between the structure and the other adhesive layer, and between the other adhesive layer and the foamed resin layer, at least one of these.

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