Reinforcement method for structure, and reinforcement member

Abstract

To provide a reinforcement member made of fibers transmitting no ultraviolet light, capable of reinforcing a structure efficiently in a short period of time, and a reinforcement method using the reinforcement member.SOLUTION: There is provided a reinforcement method for bonding reinforcement members made of reinforced fibers transmitting no ultraviolet light to a structure using an adhesive of ultraviolet cured resin. The reinforce member has a UV non-transmissive part and a UV transmissive part, the UV non-transmissive part is fiber reinforced plastic made by hardening the fiber resin previously impregnated with resin, and the reinforcement member has integrated light quantity, measured by the following method, of 150 mJ / cm2 or more at the least integrated light quantity part. The reinforcement member is bonded to the structure by hardening the adhesive by irradiating the adhesive coated on the structure with ultraviolet light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for reinforcing a structure and a reinforcing material. [Background technology]

[0002] Patent Document 1 discloses a reinforcing method for reinforcing a structure by fixing a fiber-reinforced resin sheet, which is transparent at least in a cured state, to the structure.

[0003] Patent Document 2 discloses a reinforcing method for reinforcing a structure by bonding fibers such as carbon fiber sheets with an ultraviolet curing resin.

[0004] Patent Document 3 discloses a reinforcing method for reinforcing a structure by adhering a reinforcing material in which reinforcing fibers are aligned in one direction to the structure using a room-temperature curing resin, which is a room-temperature curing matrix resin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-336393 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-97547 [Patent Document 3] Japanese Patent Application Publication No. 03-224901 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, fibers are fixed to a structure using an ultraviolet-curing resin that hardens when exposed to ultraviolet light, allowing the structure to be reinforced in a shorter time than when reinforcing materials are fixed to a structure using a room-temperature-curing resin. However, as exemplified in the document, the method in Patent Document 1 is limited to reinforcing fibers that transmit ultraviolet light, such as glass fibers. Fibers that are stronger or stiffer than glass fibers, such as carbon fiber, basalt fiber, aramid fiber, and metal fiber, are opaque and therefore difficult to adhere to a structure using an ultraviolet-curing resin.

[0007] In fact, Patent Document 2 discloses the idea of ​​adhering fiber sheets made of a single fiber, such as carbon fiber, aramid fiber, or vinylon fiber, to a structure using an ultraviolet-curing resin, but in Example 1 and other examples in the publication, when opaque carbon fiber and aramid fiber were used, the resin in the carbon fiber and aramid fiber sheets and the resin at the adhesive surface between the fiber sheet and the structure were not cured sufficiently.As such, the current situation is that it is practically difficult to adhere opaque fibers, which have greater strength or rigidity than glass fiber, to a structure using an ultraviolet-curing resin to reinforce the structure.

[0008] Therefore, when using reinforcing materials made of fibers that do not transmit ultraviolet light, such as carbon fiber, basalt fiber, aramid fiber, or metal fiber, the current method is to use a method of adhering them to structures using a room temperature curing resin, as described in Patent Document 3.

[0009] Generally, when room-temperature curing resin is used to bond reinforcement, it takes more than a day for the initial hardening and more than a week for the strength to develop. Furthermore, when using room-temperature curing resin to attach multiple layers of reinforcement to a structure, the amount that can be attached at one time must be limited to prevent the reinforcement from sagging or peeling due to its own weight before the resin hardens, which lengthens the construction period and leaves room for improvement in work efficiency.

[0010] An object of the present invention is to provide a reinforcing material made of fibers that are opaque to ultraviolet light, which can reinforce a structure efficiently in a short period of time, and a reinforcing method using the reinforcing material. [Means for solving the problem]

[0011] The reinforcing method of the first aspect is a reinforcing method in which a reinforcing material made of reinforcing fibers that do not transmit ultraviolet light is adhered to a structure with an adhesive made of an ultraviolet-curing resin, the reinforcing material having an ultraviolet-blocking portion and an ultraviolet-blocking portion, the ultraviolet-blocking portion being a fiber-reinforced plastic in which the reinforcing fibers have been previously impregnated with a resin and cured, and further, the reinforcing material has an integrated light amount of 150 mJ / cm at the portion with the smallest integrated light amount, as measured by the following measurement method: 2 As described above, the adhesive applied to the structure is irradiated with ultraviolet light to harden the adhesive, thereby adhering the reinforcing material to the structure.

[0012] In the measurement method, a sample of the reinforcing material of the same size as the photosensitive paper is placed parallel to the photosensitive paper at a distance of 5 mm from the surface of the photosensitive paper, and an average integrated light dose of 1000 mJ / cm 2 is applied from an ultraviolet irradiation lamp to the outer surface of the sample. 2 After irradiation so as to satisfy the above, the integrated amount of ultraviolet light that reaches the adhesive side of the sample from the non-adhesive side is measured based on the color density of the photosensitive paper. In the measurement method, ultraviolet light is irradiated onto the entire surface of the sample along a hemisphere centered at the center of the sample in a plan view.

[0013] In the reinforcing method of the first aspect, an adhesive applied to a structure is irradiated with ultraviolet light to harden the adhesive, thereby bonding the reinforcing material to the structure.

[0014] Here, the reinforcing material is a fiber-reinforced plastic in which the ultraviolet-blocking portion is made by pre-impregnating reinforcing fibers with resin and curing it. Furthermore, the reinforcing material has an integrated light quantity of 150 mJ / cm at the portion with the smallest integrated light quantity, as measured by the above-mentioned measuring method. 2 That's all.

[0015] Therefore, even if the reinforcing material is made of reinforcing fibers that do not transmit ultraviolet light, the amount of light required to cure the adhesive is ensured across the entire surface of the reinforcing material and the adhesive surface. As a result, problems with conventional technology, such as poor curing of the resin within the reinforcing material and poor adhesion between the reinforcing material and the adhesive surface, are suppressed, making it possible to reinforce structures.

[0016] Thus, according to the first aspect of the reinforcing method, even if the reinforcing material is made of reinforcing fibers that do not transmit ultraviolet light, it is possible to reinforce the structure by irradiating it with ultraviolet light. Therefore, compared to bonding glass fibers to the structure with ultraviolet-curing resin, or compared to bonding reinforcing material to the structure with room-temperature-curing resin, the structure can be reinforced more efficiently and in a shorter time.

[0017] As in the reinforcing method of the second embodiment, in the first embodiment, at least one of carbon fiber, basalt fiber, aramid fiber, and metal fiber may be used as the reinforcing fiber.

[0018] The reinforcing material of the third embodiment is a reinforcing material that is adhered to a structure with an ultraviolet-curing resin adhesive and is made of reinforcing fibers that do not transmit ultraviolet light, and has an ultraviolet-blocking portion and an ultraviolet-blocking portion, and the ultraviolet-blocking portion is a fiber-reinforced plastic that has been obtained by impregnating the reinforcing fibers with resin in advance and curing the resin, and the integrated light amount measured by the following measurement method is 150 mJ / cm at the portion with the smallest integrated light amount. 2 That's all.

[0019] In the measurement method, a sample of the reinforcing material of the same size as the photosensitive paper is placed parallel to the photosensitive paper at a distance of 5 mm from the surface of the photosensitive paper, and an average integrated light dose of 1000 mJ / cm 2 is applied from an ultraviolet irradiation lamp to the outer surface of the sample. 2 After irradiation so as to satisfy the above, the integrated amount of ultraviolet light that reaches the adhesive side of the sample from the non-adhesive side is measured based on the color density of the photosensitive paper. In the measurement method, ultraviolet light is irradiated onto the entire surface of the sample along a hemisphere centered at the center of the sample in a plan view.

[0020] Here, the reinforcing material is a fiber-reinforced plastic in which the ultraviolet-blocking portion is made by pre-impregnating reinforcing fibers with resin and curing it. Furthermore, the reinforcing material has an integrated light quantity of 150 mJ / cm at the portion with the smallest integrated light quantity, as measured by the above-mentioned measuring method. 2 That's all.

[0021] Therefore, even if the reinforcing material is made of reinforcing fibers that do not transmit ultraviolet light, the amount of light required to cure the adhesive is ensured across the entire surface of the reinforcing material and the adhesive surface. As a result, problems with conventional technology, such as poor curing of the resin within the reinforcing material and poor adhesion between the reinforcing material and the adhesive surface, are suppressed, making it possible to reinforce structures.

[0022] Thus, with the reinforcing material of the third aspect, even if the reinforcing material is made of reinforcing fibers that do not transmit ultraviolet light, it is possible to reinforce a structure by irradiating it with ultraviolet light, and therefore, compared to when glass fibers are bonded to a structure with an ultraviolet-curing resin, or when a reinforcing material is bonded to a structure with a room-temperature-curing resin, it is possible to reinforce a structure more efficiently and in a shorter time. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a reinforcing material made of fibers that do not transmit ultraviolet light, which can reinforce a structure efficiently in a short time, and a reinforcing method using the reinforcing material. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic cross-sectional view showing a state in which a reinforcing material is adhered to the surface of a structure with an adhesive by the reinforcing method according to the present embodiment. FIG. [Figure 2] 1A and 1B are diagrams for explaining a measurement method according to the present embodiment, showing a state in which a reinforcing material sample is placed on a frame, in which (A) is a plan view and (B) is a side cross-sectional view. [Figure 3]1A and 1B are diagrams for explaining a measurement method according to the present embodiment, showing a state in which a frame-shaped spacer is placed on photosensitive paper, where (A) is a plan view and (B) is a side cross-sectional view. [Figure 4] FIG. 1 is a diagram for explaining a measurement method according to the present embodiment, and is a side cross-sectional view showing a state in which ultraviolet light is irradiated onto a sample from an ultraviolet light irradiation lamp. [Figure 5] 1A and 1B are diagrams illustrating an example of a reinforcing material according to the present embodiment. [Figure 6] 10A and 10B are diagrams showing modified examples of the reinforcing material according to the present embodiment. [Figure 7] 10 is a table showing the area ratio of a portion where a predetermined integrated amount of light is reached in Examples and Comparative Examples. [Figure 8] FIG. 10 is a conceptual diagram showing the area ratio of a portion where a predetermined integrated light amount is reached in an example and a comparative example. [Figure 9] 1 is a table showing the evaluation results of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0025] An example of an embodiment of the present invention will be described below with reference to the drawings.

[0026] In this specification, a numerical range indicated using "to" means a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively. Furthermore, in the numerical ranges described in stages in this specification, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in the numerical ranges described in this specification, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples. In this specification, when multiple substances corresponding to each component exist, the amount of each component means the total amount of multiple substances, unless otherwise specified.

[0027] <Reinforcement method> As shown in FIG. 1, the reinforcing method according to this embodiment is a reinforcing method in which a reinforcing material 15 made of reinforcing fibers that do not transmit ultraviolet light is adhered to a structure 11 with an adhesive 14 made of ultraviolet curable resin.

[0028] In this embodiment, it has been discovered that even if the reinforcing material 15 is made of reinforcing fibers that do not transmit ultraviolet rays, if the reinforcing material 15 has a specific configuration, it can be adhered using an adhesive 14 made of ultraviolet-curing resin, and a method has been adopted in which the reinforcing material 15 is adhered using an adhesive 14 made of ultraviolet-curing resin.

[0029] Below, we will explain the structure 11 to be reinforced, and the adhesive 14 and reinforcing material 15 used in this reinforcement method. After that, we will explain the procedure of the reinforcement method, the effects of the reinforcement method, and the evaluation of the reinforcement method.

[0030] <Structure 11> Examples of a structure 11 (see FIG. 1) to be reinforced by the reinforcing method according to this embodiment include a concrete structure and a steel structure.

[0031] Examples of concrete structures include plant structures such as chimney bodies and foundations, power poles, telegraph poles, and overhead line poles. Examples of concrete structures include, but are not limited to, reinforced concrete structures with reinforcing bars inside the pillars and unreinforced concrete structures, and may include, for example, superstructures and substructures of road bridges, tunnels, and concrete foundations of buildings, as long as they are concrete structures.

[0032] Examples of steel structures include chimneys, pipes and pipe racks, plant structures such as water tanks and tanks, footbridges and signposts, girders and truss members in steel bridges, and the like.

[0033] Furthermore, the structure 11 is not limited to a concrete structure or a steel structure, but may be, for example, a structure made of mortar, ceramics, metal (stainless steel, etc.), glass, etc., as long as it is a structure to be reinforced. Note that, hereinafter, the surface 11A of the structure 11 reinforced by the reinforcing method according to this embodiment may be referred to as the reinforced surface 11A.

[0034] <Adhesive 14> The adhesive 14 (see FIG. 1) has the function of adhering the reinforcing material 15 to the structure 11. The adhesive 14 is made of an ultraviolet curing resin. There are no particular limitations on the ultraviolet curing resin as long as it undergoes a curing reaction due to ultraviolet light irradiated from a light source such as sunlight or an ultraviolet irradiator, but it is preferable to use a resin that polymerizes due to radical species or cation species, and for example, urethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, polythiol, butadiene acrylate, etc. are used.

[0035] In addition to the above materials, the adhesive 14 may contain additives such as a curing accelerator, a thickener, an antifoaming agent, a foaming agent, a rust inhibitor, a colorant, a shrinkage reducing agent, an initiator, and an expanding agent. The additives used should not impede the transmission of ultraviolet light.

[0036] Furthermore, the adhesive 14 may be capable of undergoing a chain reaction due to the heat of reaction generated during the polymerization reaction caused by irradiation with ultraviolet light, or may contain a thermal cationic polymerization initiator so that it has both heat curing and ultraviolet curing properties.

[0037] <Reinforcement material 15> As shown in Fig. 1, the reinforcing material 15 is adhered to the surface 11A to be reinforced of the structure 11 with an adhesive 14, and is a material that reinforces the structure 11. In this embodiment, the reinforcing material 15 is a reinforcing material made of reinforcing fibers 17 that do not transmit ultraviolet light, and has an ultraviolet-blocking portion 16 and an ultraviolet-blocking portion 19. The ultraviolet-blocking portion 16 is a fiber-reinforced plastic obtained by previously impregnating the reinforcing fibers 17 with a matrix resin 18 and curing it.

[0038] The reinforcing fiber 17 that does not transmit ultraviolet light is, for example, at least one of carbon fiber, basalt fiber, aramid fiber, and metal fiber. Therefore, one or more of carbon fiber, basalt fiber, aramid fiber, and metal fiber can be used as the reinforcing fiber 17. However, examples of the reinforcing fiber are not limited to these, and any fiber that does not transmit ultraviolet light may be used.

[0039] The matrix resin 18 may be a thermosetting resin such as a room temperature curing or thermosetting epoxy resin, vinyl ester resin, acrylic resin, unsaturated polyester resin, or phenolic resin, or a thermoplastic resin such as an in-situ polymerization type phenoxy resin or nylon, and preferably an epoxy resin, which is a thermosetting resin.

[0040] The ultraviolet light passing portion 19 is a portion that passes ultraviolet light from the non-adhesive surface 15A side of the reinforcing material 15 to the adhesive surface 15B side (see Figures 1 and 5(A)). In this embodiment, the ultraviolet light passing portion 19 is formed by a space. The adhesive surface 15B is the surface of the reinforcing material 15 that is adhered to the structure 11, and is the surface that faces the structure 11 when the reinforcing material 15 is adhered to the structure 11. The non-adhesive surface 15A is the surface opposite to the adhesive surface 15B, and is the surface that faces away from the structure 11 when the reinforcing material 15 is adhered to the structure 11.

[0041] The reinforcing material 15 has an integrated light quantity of 150 mJ / cm at the part with the smallest integrated light quantity (hereinafter referred to as the minimum part) in the integrated light quantity measured by the following measurement method. 2 Here, since the ultraviolet ray non-transmitting portion 16 is made of fibers that do not transmit ultraviolet rays, the minimum portion occurs in the region where the ultraviolet ray non-transmitting portion 16 is arranged.

[0042] In the measurement method (see FIGS. 2, 3, and 4), a sample 81 of the reinforcing material 15 having the same size as the photosensitive paper 83 is placed parallel to the photosensitive paper 83 at a distance of 5 mm from the surface of the photosensitive paper 83, and an average integrated light amount of 1000 mJ / cm 2 is irradiated onto the outer surface of the sample 81 from an ultraviolet irradiation lamp 86 (for example, a wavelength of 365 nm). 2 After irradiation to the above extent, the integrated amount of ultraviolet light reaching from the non-adhesive surface 81A side to the adhesive surface 81B side of the sample 81 is measured based on the color density of the photosensitive paper 83. In this measurement method, an ultraviolet irradiation lamp 86 is moved over the entire surface of a hemispherical surface 85 centered at the center 81C of the sample 81 in a plan view, to irradiate the sample with ultraviolet light.

[0043] Specifically, as shown in Figures 2(A) and (B), a sample 81 of the reinforcing material 15 is placed in a frame 82. The opening of the frame 82 is rectangular, for example, 50 mm x 50 mm. As shown in Figures 3(A) and (B), a frame-shaped spacer 84 is placed on photosensitive paper 83. The opening of the spacer 84 is rectangular, for example, 50 mm x 50 mm, the same as the opening of the frame 82. The height of the spacer 84 is 5 mm.

[0044] As shown in Fig. 4, the sample 81 together with the frame 82 is placed on the spacer 84. The spacer 84 allows the sample, which has the same size as the photosensitive paper 83, to be placed parallel to the photosensitive paper 83 and spaced 5 mm from the surface of the photosensitive paper 83.

[0045] Next, ultraviolet light is irradiated by moving an ultraviolet light irradiation lamp 86 over the entire surface of a hemispherical surface 85 centered on a center 81C in a plan view of the sample 81. The radius of the hemispherical surface 85 is set to, for example, 100 mm.

[0046] Average cumulative light intensity from UV lamp: 1000mJ / cm 2 After irradiation as described above, the integrated amount of ultraviolet light that has reached the adhesive surface 81B side of the sample 81 from the non-adhesive surface 81A side is measured from the color density of the photosensitive paper 83.

[0047] In a preliminary test using only the photosensitive paper 83, when the ultraviolet irradiation lamp 86 was irradiated for 30 seconds, the average integrated light intensity on the entire surface of the photosensitive paper 83 was 1000 mJ / cm 2 Therefore, the measurement method was performed with the irradiation time of the ultraviolet irradiation lamp 86 set to 30 seconds. Also, it is not necessary to move the ultraviolet irradiation lamp 86 as long as the entire surface of the hemispherical surface 85 is irradiated with ultraviolet light.

[0048] The exposure of the photosensitive paper is confirmed based on the color sample that comes with the photosensitive paper, but it can also be done mechanically by importing the colored photosensitive paper together with the color sample into a computer and using image processing software to binarize or grayscale the paper. This method makes it easy to calculate the area of ​​the exposed area, and it is most desirable for the area ratio with an exposure of 150 mJ or more to be 100%, but this area ratio must be at least 95% or more, and more preferably 99% or more.

[0049] The integrated light amount changes, for example, according to at least the following conditions (1) to (5). (1) The size of the ultraviolet light passing portion 19 (specifically, the distance between the ultraviolet light non-passing portions 16) (2) Cross-sectional shape of the ultraviolet-blocking portion 16 (specifically, width, thickness, and outer shape) (3) Distance between the adhesive surface 15B and the reinforced surface 11A (4) Physical properties of the matrix resin 18 (e.g., the degree of ultraviolet light reflection, absorption, transmission, and refraction) (5) Characteristics of the outer surface of the UV-blocking portion 16 (specifically, surface coating with UV-reflecting properties, surface processing such as unevenness, etc.)

[0050] Note that fiber reinforced plastic made of reinforcing fibers 17 that do not transmit ultraviolet light is a fiber that does not harden to the inside of the strand after ultraviolet light is irradiated onto a fiber bundle of 24,000 fibers impregnated with ultraviolet-curable resin and twisted at 25 T / m to form a strand. Therefore, as long as the ultraviolet-curable resin in the strand remains uncured in the above-mentioned measurement method, even colored glass fiber can be used as the reinforcing fiber 17 in the present invention, but preferably one or more of carbon fiber, basalt fiber, and metal fiber can be used.

[0051] The reinforcing material 15 may be, for example, a planar member having ultraviolet-blocking portions 16 in one direction and two directions as shown in Figs. 5(A) and 6(A), or may have a three-dimensional shape such as a convex body 21 for adjusting the distance between the adhesive surface 15B and the surface to be reinforced 11A as shown in Fig. 6(B), but is not limited to these. The reinforcing material 15 has ultraviolet-blocking portions 16 and ultraviolet-transmitting portions 19, and the integrated light amount at the portion with the smallest integrated light amount (hereinafter referred to as the minimum portion) measured by the above-mentioned measurement method is 150 mJ / cm 2 Anything above that is fine.

[0052] 5(A)(B), in a planar member having a cylindrical cross section and an ultraviolet-blocking portion 16 in one direction, the ratio of the diameter of the ultraviolet-blocking portion 16 to the spacing of the ultraviolet-transmitting portion 19 is, for example, 0.4 or more and 3 or less, more preferably 1.7 or more and 3 or less. If the ratio is less than 0.4, the ultraviolet-transmitting portion 19 is narrow and ultraviolet light does not easily pass through, so that the integrated light amount of 150 mJ / cm 2 It is difficult to secure this.

[0053] On the other hand, if the ratio exceeds 3, the number of fibers 17 per unit area of ​​the reinforcing material 15 decreases, and even if the fibers 17 are high-strength carbon fibers, the amount of reinforcement per unit area is inferior to that when glass fibers considered to be E-glass are arranged without gaps, and the advantage of the present invention is lost.

[0054] The reinforcing material 15 having such an ultraviolet ray non-transmitting portion 16 in one direction may be a member consisting of only one ultraviolet ray non-transmitting portion 16, such as a rod-shaped or twisted wire-shaped or wire rope-shaped member having an irregular cross section formed by further twisting these together, or a rod-shaped member having a rectangular or any polygonal cross section such as a pultrusion molding material, or may be a strip-shaped member. One or more types of ultraviolet ray non-transmitting portions 16 may be combined and aligned in the width direction with a temporary wire fixing material such as a weft thread within a range that does not reduce the integrated light amount, or the ultraviolet ray non-transmitting portion 16 may be woven and fixed into part of a knitted fabric made of natural or heat-sealed yarn or the like.

[0055] In addition to the above, the reinforcing material may be a mesh-like member in which UV-blocking portions 16 are combined in three or more directions, or a plate-like member in which materials such as prepreg are laminated while changing the direction in one or more directions, and openings may be formed by processing the plate-like member. The opening shape may be triangular, rectangular, hexagonal, round, oval, or a combination thereof.

[0056] More specific examples of the above-mentioned reinforcing materials include a reinforcing material in which a plurality of fiber-reinforced plastic wires containing reinforcing fibers are aligned in a curtain-like shape in the longitudinal direction and the fiber-reinforced plastic wires are fixed to each other with a wire fixing material, a lattice material or mesh material in which a plurality of fiber-reinforced plastic wires containing reinforcing fibers are arranged in a lattice pattern, and a reinforcing material in which a plurality of rod-shaped or strip-shaped fiber-reinforced plastic materials containing reinforcing fibers are arranged in the structure.

[0057] The matrix resin 18 may be used to perform a surface treatment on the reinforcing material 15 to reflect ultraviolet light (for example, smoothing the surface, applying white paint, or metal deposition).

[0058] <Reinforcement method procedure> The procedure for reinforcing a structure according to this embodiment is illustrated below, but other than the step of adhering to the structure 11 with an ultraviolet-curing resin adhesive 14, there are no particular limitations, and various modifications, changes, and additions of steps are possible.

[0059] (Surface preparation) The brittle layer on the surface of the structure 11 is removed. This may be done using a tool such as a disc grinder, or if the structure 11 is made of steel, a chemical such as a paint-type surface conditioning reducer (for example, SabiShut, manufactured by Dai Nippon Toryo Co., Ltd.) may be applied after the brittle layer is removed.

[0060] (Primer application) A primer layer 12 may be formed on the outer surface of the structure 11 in order to increase adhesion to other materials such as adhesive 14. As the primer, in addition to ultraviolet curing resin, room temperature or heat curing epoxy resin or urethane resin, or even MMA resin containing a radical generator such as peroxide may be used. This step is not necessarily required and may be omitted.

[0061] (Uneven land correction) If the structure has significant unevenness, you may apply an unevenness correction material 13. As the unevenness correction material 13, in addition to UV-curable resin, you may also use room temperature or heat-curable epoxy resin or urethane resin, or even MMA resin containing a radical generator such as peroxide. This step is not necessarily required and may be omitted.

[0062] (Reinforcing material adhesion) Adhesive 14 is applied to structure 11, reinforcing material 15 is adhered, and the adhesive 14 is cured by irradiating with ultraviolet light. Alternatively, reinforcing material 15 is fixed to structure 11, adhesive 14 is applied, and then the adhesive 14 is cured by irradiating with ultraviolet light. In order to maintain an appropriate distance between adhesive surface 15B of reinforcing material 15 and reinforced surface 11A, as shown in FIG. 5(C), a spacer 22 may be appropriately placed between reinforced surface 11A and adhesive surface 15B. The spacer 22 may be, for example, a convex object such as silica sand, metal pieces, or grains, or it may also be a washer or bolt.

[0063] Other steps may be added as appropriate within the scope of the present invention, such as applying a surface impregnating agent to the substrate, applying a high-extension elastic putty, and applying a finish coat.

[0064] <Other examples of reinforcement material 15> Examples of the reinforcing material are not limited to the reinforcing material 15 shown in FIGS. 5(A), (B), (C) and 6(A) and (B). In the above-described embodiment, the ultraviolet-ray passing portion 19 of the reinforcing material 15 is configured by a space, but this is not limited thereto. The ultraviolet-ray passing portion 19 may be configured by a material that transmits ultraviolet rays (for example, a resin material). In this case, the integrated light amount varies depending on the above-described conditions (1) to (5) as well as the state of the ultraviolet-ray passing portion 19 (specifically, the degree of the properties of the resin or resin composition that fills the space to transmit, refract, and scatter ultraviolet rays). However, the integrated light amount measured by the above-described measurement method is 150 mJ / cm at the portion with the smallest integrated light amount. 2 Make sure it is above that.

[0065] Other examples of the reinforcing material 15 include a fiber sheet material in which a biaxially woven or multiaxially woven substrate such as a plain weave woven using a tape-like unidirectional reinforcing fiber substrate in which reinforcing fibers 17 that do not transmit ultraviolet light are aligned in one direction is impregnated with ultraviolet-curing resin, and a strip-shaped molded body in which a substrate in which multiple fiber-reinforced plastic wires containing reinforcing fibers are aligned in the longitudinal direction like a curtain or bundled is used as the substrate and is impregnated with ultraviolet-curing resin.

[0066] Furthermore, the ultraviolet light passing portion 19 does not have to be inside the reinforcing material 15, and there is a space between the reinforced surface 11A and the adhesive surface 15B through which ultraviolet light passes, and the integrated light amount measured by the above-mentioned measuring method is 150 mJ / cm at the portion with the smallest integrated light amount. 2 It would be good if it was more than that.

[0067] <Effects of this embodiment> The effects of this embodiment will be described.

[0068] In the reinforcing method according to this embodiment, the adhesive 14 applied to the structure 11 is irradiated with ultraviolet light to harden the adhesive 14, thereby bonding the reinforcing material 15 to the structure 11.

[0069] Here, the reinforcing material 15 is integrated by previously impregnating and curing the reinforcing fibers 17 with the matrix resin 18 in the ultraviolet-blocking portion 16. Furthermore, the reinforcing material 15 has an integrated light amount of 150 mJ / cm at the minimum portion where the integrated light amount is the smallest, when measured by the above-mentioned measuring method. 2 As described above, ultraviolet light passing portion 19 (space in this embodiment) is provided. Therefore, even if reinforcing material 15 is made of reinforcing fiber 17 that does not transmit ultraviolet light, the amount of light required to cure adhesive 14 is ensured over the entire surface of reinforcing material 15.

[0070] As a result, poor curing of the resin in the reinforcing material 15 and poor adhesion between the reinforcing material and the adhesive surface are suppressed, making it possible to reinforce the structure. As described above, according to the reinforcing method of this embodiment, even if the reinforcing material 15 is made of reinforcing fibers 17 that do not transmit ultraviolet light, it is possible to reinforce the structure 11 by irradiating it with ultraviolet light, so that the reinforcing efficiency is improved compared to when glass fibers are bonded to the structure 11 with an ultraviolet-curing resin, and the structure 11 can be reinforced more efficiently in a shorter time than when the reinforcing material 15 is bonded to the structure 11 with a room-temperature curing resin.

[0071] <Evaluation test> In this test, the reinforcing effect of the reinforcing method according to the present embodiment was evaluated. Specifically, in this test, the examples and comparative examples were evaluated as follows.

[0072] [Adhesive 14] A quick-drying UV resin liquid manufactured by Daiso Industries Co., Ltd. was used as the adhesive 14. The material of the adhesive 14 is acrylate resin. According to preliminary tests, a coating film approximately 3 mm thick can be fully cured by irradiating it with 600 W ultraviolet light at a wavelength of 365 nm from a height of 70 mm for 12 minutes. The Shore hardness when fully cured was approximately D79.

[0073] [Reinforcement 15] The reinforcing fibers were carbon fiber "TR-50-15L" manufactured by Mitsubishi Chemical Corporation, impregnated with a heat-curing epoxy resin, twisted at 15 T / m, and then cured to obtain fiber-reinforced plastic strands, which served as ultraviolet-blocking portions 16. The width of the ultraviolet-blocking portions 16, specifically the spacing between the ultraviolet-blocking portions 16, was varied for each example and comparative example, and the FRP sheets used were aligned. The diameter of the fiber-reinforced plastic strands was 1.13 mm.

[0074] [Example 1] The width of the ultraviolet light passing portion 19 was 2.0 mm, and the ratio of the diameter of the ultraviolet light non-passing portion 16 to the spacing of the ultraviolet light passing portion 19 was 1.77. In the integrated light amount measured by the above-mentioned measurement method, the integrated light amount at the smallest portion with the smallest integrated light amount was 150 mJ / cm 2 That's all.

[0075] [Example 2] The width of the ultraviolet light passing portion 19 was 0.46 mm, and the ratio of the diameter of the ultraviolet light non-passing portion 16 to the spacing of the ultraviolet light passing portion 19 was 0.41. In the integrated light amount measured by the above-mentioned measurement method, the integrated light amount at the smallest portion with the smallest integrated light amount was 150 mJ / cm 2 That's all.

[0076] [Comparative Example 1] The width of the ultraviolet light passing portion 19 was 0.17 mm, and the ratio of the diameter of the ultraviolet light non-passing portion 16 to the spacing of the ultraviolet light passing portion 19 was 0.41. In the integrated light amount measured by the above-mentioned measurement method, the integrated light amount at the smallest portion with the smallest integrated light amount was 100 mJ / cm 2 In addition, the cumulative light intensity is 150 mJ / cm 2 The area where this was the case was 98.7% of the area of ​​the photosensitive paper sample.

[0077] Comparative Example 2 The width of the ultraviolet light passing portion 19 is set to 0.0 mm. The ratio of the diameter of the ultraviolet light non-passing portion 16 to the spacing of the ultraviolet light passing portion 19 is 0.00. In the integrated light amount measured by the above-mentioned measurement method, the integrated light amount at the smallest portion with the smallest integrated light amount is 100 mJ / cm. 2 The cumulative light intensity is less than 150 mJ / cm 2 The area above this level was 58.0% of the area of ​​the photosensitive paper sample.

[0078] [Adhesion strength test] The adhesion strength test was conducted in accordance with the adhesion test method (draft) between continuous fiber sheet and concrete: JSCE-E-545 and the adhesion strength test described in JIS K6909 Architectural Finishing Coating Materials (the so-called Construction Research Institute type test).

[0079] Test pieces for the bond strength test were prepared as follows.

[0080] A 20mm thick SS400 carbon steel plate was cleaned with type 2 polishing and then coated with UV-curable resin. Next, a strand sheet with wires aligned at a specified interval was attached. Further, UV-curable resin was applied to a thickness of 2.5mm. Next, using a UV irradiation device (HLP60UV365-S1 manufactured by Pi Photonics Co., Ltd.), ultraviolet light was irradiated for 12 minutes from a height of approximately 70mm while varying the angle.

[0081] [Shore hardness measurement] Shore hardness measurements were carried out with reference to JIS K6253-3, Determination of hardness of vulcanized rubber and thermoplastic rubber - Part 3: Durometer hardness. The measuring device used was a durometer (Teclock Rubber / Plastic Hardness Tester GS-702G). After the BRI test, the resin hardness was measured at the gap between the strand sheet wires on the peel interface side to determine the degree of hardening.

[0082] [Area ratio of the part that reaches the specified integrated light amount] A photosensitive paper sample (UV Scale L manufactured by Fujifilm Corporation) and a photosensitive paper color development standard chart were scanned using a scanner (RICOH IM C2510F manufactured by Ricoh Co., Ltd.) at a resolution of 600 dpi (1 pixel = 0.423 mm). Then, with reference to the photosensitive paper color development standard chart, the sample was binarized so that pixels that did not reach a specified cumulative light amount were white and pixels that were irradiated with ultraviolet light above a specified cumulative light amount were black. The areas of completely white (#FFFFFF) and completely black (#000000) areas were calculated, and the percentage of the total area that was black was calculated (see Figures 7 and 8).

[0083] [Evaluation results] The test results of the examples and comparative examples are shown in the table of Figure 9. In Example 1, the curing reaction of the ultraviolet curing resin progressed, and the strength of the resin reached 1.0 N / mm against the steel plate simulating the structure to be reinforced. 2 In contrast, in Comparative Examples 1 and 2, ultraviolet light did not easily pass through the reinforcing material, resulting in a significant decrease in adhesive strength and the resin at the peel interface being in a liquid state in some areas, making them unsuitable for practical use.

[0084] The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0085] 10 Reinforcement methods 11 Structures 12 Primer layer 13 Unevenness correction material 14 Adhesive 15 Reinforcement 15A Non-adhesive surface 15B Adhesive surface 16 Ultraviolet non-transmissive area 17 Reinforced Fiber 18 Matrix Resin 19 Ultraviolet passing part 81 samples 81A Non-adhesive surface 81B Adhesive surface 81C center 82 Frame 83 Photosensitive paper 84 Spacer 85 hemisphere 86 Ultraviolet irradiation lamp

Claims

1. A reinforcement method for adhering a reinforcing material made of reinforcing fibers that do not transmit ultraviolet light to a structure using an adhesive containing an ultraviolet curing resin, comprising: the reinforcing material has an ultraviolet ray non-transmitting portion and an ultraviolet ray transmitting portion, the ultraviolet ray non-transmitting portion being a fiber reinforced plastic obtained by impregnating the reinforcing fibers with a resin in advance and curing the resin, Furthermore, the reinforcing material has an integrated light amount of 150 mJ / cm at the part with the smallest integrated light amount, when measured by the following measurement method. ２ That's all, The adhesive applied to the structure is irradiated with ultraviolet light to harden the adhesive, thereby bonding the reinforcing material to the structure. Methods for reinforcing structures. In the measurement method, a sample of the reinforcing material having the same size as the photosensitive paper is placed parallel to the photosensitive paper at a distance of 5 mm from the surface of the photosensitive paper, and an average integrated light amount of 1000 mJ / cm 2 is applied from an ultraviolet irradiation lamp to the outer surface of the sample. ２ After irradiation to the extent described above, the integrated amount of ultraviolet light that has reached the adhesive surface side of the sample from the non-adhesive surface side is measured from the color density of the photosensitive paper. In the measurement method, ultraviolet light is irradiated onto the entire surface of the sample along a hemispherical surface centered at the center of the sample in a plan view.

2. The reinforcing fiber is at least one of carbon fiber, basalt fiber, aramid fiber, and metal fiber. The method for reinforcing a structure according to claim 1.

3. A reinforcing material made of reinforced fibers that are adhered to a structure with an ultraviolet-curing resin adhesive and do not transmit ultraviolet light, a fiber-reinforced plastic having an ultraviolet-blocking portion and an ultraviolet-passing portion, the ultraviolet-blocking portion being formed by impregnating the reinforcing fibers with a resin in advance and curing the resin; The integrated light amount measured by the following measurement method is 150 mJ / cm at the part with the smallest integrated light amount. ２ That's all Reinforcement material. In the measurement method, a sample of the reinforcing material having the same size as the photosensitive paper is placed parallel to the photosensitive paper at a distance of 5 mm from the surface of the photosensitive paper, and an average integrated light amount of 1000 mJ / cm 2 is applied from an ultraviolet irradiation lamp to the outer surface of the sample. ２ After irradiation to the extent described above, the integrated amount of ultraviolet light that has reached the adhesive surface side of the sample from the non-adhesive surface side is measured from the color density of the photosensitive paper. In the measurement method, ultraviolet light is irradiated onto the entire surface of the sample along a hemispherical surface centered at the center of the sample in a plan view.

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