JPH03292110A - Unidirectional arrangement hybrid reinforced fiber sheet, production thereof and reinforcing method for structure - Google Patents

Abstract

PURPOSE:To enable reinforcement excellent in workability in a reinforcing field and to enhance rupture strength of a structure and to prevent a crack by unidirectionally arranging and bonding a first reinforced fiber high in rigidity and a second reinforced fiber high in toughness respectively on one-side face and the other-side face of a substrate sheet. CONSTITUTION:A unidirectional arrangement reinforced fiber sheet 1 is constituted of a substrate sheet 2, a first reinforced fiber 4 high in rigidity which is unidirectionally arranged and bonded on one-side face of the substrate sheet 2 via an adhesive layer 3 and a second reinforced fiber 6 high in toughness which is unidirectionally arranged and bonded on the other-side face via an adhesive layer 5. Reinforcement of a structure is performed by impregnat ing the reinforced fiber 4 and 6 with room temp. setting type matrix resin in a reinforcing field such as a bridge and an elevated road and leaving this reinforced fiber to stand while sticking it to the surface of the reinforcing part of a structure and curing the matrix resin. Further the first reinforced fiber 4 has rigidity of >=5 ton/mm<2> modulus of elasticity and the second reinforced fiber 6 has breaking extension of at least 1.2%. Moreover the second reinforced fiber 6 preferably has toughness larger than breaking extension of the first rein forced fiber 4 by at elast 20%.

Description

[Detailed Description of the Invention] (1) When reinforcing structures such as bridges and elevated roads using fiber-reinforced plastics, the present invention enables the reinforcement to be carried out easily at the reinforcement site and improves the reinforcement strength. The present invention relates to a one-sided array hybrid reinforcing fiber sheet used for reinforcing structures, a method for manufacturing the same, and a method for reinforcing structures.

Nijii TatenironI Bridge piers such as bridges and elevated roads are being reinforced with fiber-reinforced plastics.

Conventional methods for reinforcing it are: (1) pasting hardened fiber-reinforced plastic on the reinforced parts of the piers; (2) pasting prepreg on the reinforced parts of the piers to prevent deformation during heat curing. (3) Wrap a reinforcing fiber cloth around the reinforced part of the pier and impregnate it with a room-temperature curing matrix resin to create a fiber-reinforced plastic. A known method is to create a fiber-reinforced plastic by leaving it to harden after winding.

However, although the method (1) above has good reinforcement efficiency, it has a major drawback in that it cannot be applied to curved reinforcement locations.

Method (2) has the drawback that the prepreg attached to the reinforced portion of the pier must be heat-cured on site, and the heat-cure process is not easy.

In method (3), the reinforcing fibers are used in a crossed manner by hand weaving, twill weaving, etc., so the strength of the reinforcing fibers is weak at the point where the warp and weft intersect. The disadvantage is that a strong reinforcing effect cannot be obtained.

In addition to the above, another method has been considered in which reinforcing fiber threads impregnated with resin are wound on-site at the reinforcement points of bridge piers using the filament winding method, and then hardened to form fiber-reinforced plastic, but this method is limited in terms of what can be reinforced. However, there are disadvantages such as high equipment costs.

Therefore, in view of the above-mentioned current situation, an object of the present invention is to make it possible to perform reinforcement with good ease of implementation at the reinforcement site and to improve reinforcement strength when reinforcing structures such as bridges and elevated roads using fiber-reinforced plastics. An object of the present invention is to provide a one-sided array hybrid reinforcing fiber sheet that can be used for reinforcing a structure, a method for producing the same, and a method for reinforcing a structure.

The above-mentioned object is achieved by the one-sided hybrid reinforcing fiber sheet, the method for manufacturing the same, and the method for reinforcing a structure according to the present invention.

In summary, the present invention provides a support sheet, first reinforcing fibers having high rigidity arranged and bonded in one direction on one side of the support sheet via an adhesive layer, and the other side of the support sheet. This is a unidirectionally aligned hybrid reinforcing fiber sheet characterized by comprising second reinforcing fibers having high toughness which are arranged in one direction and adhered to the surface of the reinforcing fibers through an adhesive layer. Preferably, the first reinforcing fiber has an elastic modulus of 5 tons/m m
” or more, and the elongation at break of the second reinforcing fiber is 1°2
% or more and 20% or more than the elongation at break of the first reinforcing fiber.
% or more.

Further, the present invention provides an adhesive layer on one side and the other side of the support sheet, and adheres first reinforcing fibers having high rigidity to one side of the sheet by arranging them in one direction. This is a method for producing a unidirectionally aligned hybrid reinforcing fiber sheet, characterized in that second reinforcing fibers having high toughness are arranged and bonded in one direction on the other surface of the support sheet. The first and second reinforcing fibers are made by arranging fiber bundles of these reinforcing fibers in one direction with or without gaps on the adhesive layer on one side and the other side of the sheet. By crushing and breaking up the fiber bundle from above, one of the sheets,
Each can be glued onto the other side.

Furthermore, the present invention provides the method of impregnating the first and second reinforcing fibers with a room-temperature curable matrix resin, and then pasting the unidirectionally arranged hybrid reinforcing fiber sheet on the surface of the reinforced portion of the structure. A reinforcing fiber sheet is applied after applying a room-temperature-curing matrix resin to the surface of the reinforced portion of the structure, and the first and second reinforcing fibers are impregnated with the room-temperature-curing matrix resin, or the reinforcing fiber sheet is is pasted on the surface of the reinforced portion of the structure, and then a room temperature curing matrix resin is infiltrated into the reinforcing fiber sheet to impregnate the first and second reinforcing fibers, and then the matrix resin is This is a method for reinforcing a structure, which is characterized by curing.

Pond Pond Examples of the present invention will be described below.

FIG. 1 is a sectional view showing an embodiment of the unidirectionally aligned reinforcing fiber sheet of the present invention.

The unidirectionally arranged reinforcing fiber sheet 1 of the present invention comprises a support sheet 2 and a highly rigid first reinforced fiber sheet which is arranged in one direction and adhered to one surface of the support sheet 2 via an adhesive layer 3. Consisting of fibers 4 and second reinforcing fibers 6 with high toughness arranged and bonded in one direction on the other side of the support sheet 2 via an adhesive layer 5, it is suitable for reinforcement sites such as bridges and elevated roads. The reinforcing fibers 4 and 6 are impregnated with matrix resin so that they can be used for reinforcement.

According to the present invention, a room-temperature curing resin is used as the matrix resin, and by leaving the reinforcing fiber sheet 1 attached to the surface of the reinforced portion of the structure, the matrix resin is cured and the fiber-reinforced sheet is made into a fiber-reinforced plastic. As a result, the structure is reinforced.

In the present invention, the first reinforcing fibers 4 with high rigidity are provided on one surface of the support sheet 2, and the second reinforcing fibers 6 with high toughness are provided on the other surface, thereby forming the fiber reinforced sheet 1 into a hybrid. The reason for this is that when this is made into a fiber-reinforced plastic to reinforce a structure, the first reinforcing fibers 4, which have high rigidity, increase the breaking strength of the structure and prevent it from easily cracking. This is to increase the fracture toughness of the structure by using the second reinforcing fibers 6 having high toughness, to prevent the structure from immediately breaking even if a crack occurs, and to prolong the time required for the structure to break.

Figure 2 shows the results when a vertical load is applied to the surface of a hybridized fiber-reinforced plastic obtained from a hybrid reinforced fiber sheet in which reinforcing fibers with high rigidity and reinforcing fibers with high toughness are provided on the other surface. , is a graph schematically showing the stress-elongation strain curve of fiber-reinforced plastic. Figure 3 shows 1, which has even higher rigidity than the above but lower toughness.
In the case of fiber-reinforced plastics obtained from reinforced fiber sheets with different types of reinforcing fibers placed on one surface and the other,
This is a graph similar to FIG. 2.

In the case of hybrid fiber-reinforced plastics,
As shown in Figure 2, the stress σ is different from non-hybridized fiber reinforced plastics, but the elongation strain ε is large, and even if the reinforcing fibers with high rigidity break initially, the reinforcing fibers with high toughness elongate significantly. While preventing immediate rupture, the reinforcing fibers with high toughness reach the final rupture, so the area surrounded by the curve in the figure shows a large fracture energy. That is, it takes a long time for the entire fiber-reinforced plastic to break down.

On the other hand, in the case of non-hybridized fiber-reinforced plastic, as shown in Figure 3, the stress σ is high but the elongation strain ε is small, and once the reinforcing fibers begin to break, they do not stretch and immediately reach the final break. Therefore, the fracture energy indicated by the area surrounded by the curve in the figure is small. That is, the time required for the entire fiber-reinforced plastic to break down is short.

In this way, by hybridizing fiber-reinforced plastic using the hybrid reinforcing fiber sheet 1 that has two types of reinforcing fibers, the reinforcing fibers 4 with high rigidity and the reinforcing fibers 6 with high toughness, the fracture strength of the structure can be improved. While increasing the fracture toughness of the structure to prevent it from easily forming cracks, it is possible to prevent the structure from immediately breaking even if a crack occurs, thereby prolonging the time it takes for the structure to break.

Therefore, safety can be ensured when reinforcing a structure using fiber-reinforced plastic.

Practically, the first reinforcing fiber 4 has an elastic modulus of 5 tons/
The second reinforcing fibers 6 preferably have a rigidity of 1.2% or more at break and a toughness that is 620% or more greater than the elongation at break of the first reinforcing fibers 4. It is preferable that the elastic modulus of the first reinforcing fiber 4 is 5.
If it is less than ton/mm2, the rigidity is too low and the fracture strength of the structure cannot be improved sufficiently. When the elongation at break of the second reinforcing fibers 6 is less than 1.2% and is not greater than the elongation at break of the first reinforcing fibers 4 by 20% or more, the fracture toughness of the construct will not be sufficiently improved.

The reinforcing fibers 4 and 6 may be various reinforcing fibers such as pitch-based carbon fiber, boron fiber, PAN-based carbon fiber, laminated fiber, glass fiber, steel fiber, polyester fiber, polyethylene fiber, etc., as long as the combination satisfies the above characteristic values. can be used.

As the support sheet 2, scrim cloth, glass cloth, release paper, nylon film, etc. are used. Normally, the support sheet 2 does not need to have resin permeability, but if you want to be able to impregnate the matrix resin into the reinforcing fibers 4 and 6 after attaching the reinforcing fiber sheet 1 to the reinforced parts of the structure, , the above-mentioned scrim cloth, glass cloth, etc. are used for the sheet 2. The thickness of the support sheet 2 may be about 1 to 500 μm, preferably about 5 to 1100 IL, from the viewpoint of having flexibility and strength enough to support the reinforcing fibers 4 and 6.

In principle, any adhesive can be used to form the adhesive layers 3 and 5 as long as it can bond the reinforcing fibers 4 and 5 on the support sheet 2 at least temporarily. It is preferable to provide the same reinforcing effect to the adhesive layers 3 and 5. From this point of view, it is preferable to use a resin having good compatibility with the matrix resin as the adhesive. For example, when using an epoxy resin as the matrix resin, it is preferable to use an epoxy adhesive.

The thickness of the adhesive layers 3 and 5 is 10 to 3, because it is sufficient to temporarily bond the reinforcing fibers 4 and 6.
It is sufficient if it is about 0 μm.

The reinforcing fibers 4 and 6 are produced by arranging a large number of fiber bundles converged using a convergence agent as filaments or converging fiber bundles by lightly twisting them on the adhesive layers 3 and 5, respectively, and crushing them from above. As a result, the reinforcing fibers 4 and 6 are laminated into a plurality of layers by bonding using a binding agent or twisting, and are placed together on one side and the other side of the support sheet 2 via the adhesive layers 3 and 5, respectively. They are aligned and glued in the same direction.

In this case, the multiple layers of reinforcing fibers 4 and 6 are shown in FIG. 4(a).
As shown in the figure, the fiber bundles 4A and 6A are arranged densely in one direction on one side and the other side of the support sheet 2 via the adhesive layers 3 and 5, respectively, and the fiber bundles 4A and 6A are crushed from above. By bonding the lower portions of the fiber bundles 4A and 6A to the adhesive layers 3 and 5, respectively, the fiber bundles 4A and 6A are glued to the adhesive layers 3 and 5, respectively, and are laterally spaced on one side and the other side of the support sheet 2, as shown in FIG. 4(b). Alternatively, as shown in FIG. 5(a), the fiber bundles 4A and 6A may be placed on the support sheet 2 via the adhesive layers 3 and 5 at intervals in the lateral direction. The fiber bundles 4A and 6A are opened and arranged in one direction, and the lower parts of the fiber bundles 4A and 6A are adhered to the adhesive layers 3 and 5, respectively, by crushing the fiber bundles 4A and 6A from above, as shown in FIG. 5(b). They may be provided sparsely on one side and the other side of the support sheet 2 at intervals in the horizontal direction.

The fiber bundles 4A and 6A can be used either with or without opening between the fibers 4, between the fibers 6, that is, between the filaments.

The degree of crushing of the fiber bundles 4A and 6A depends on the desired layer thickness of the multiple layers of fibers 4 and 6 arranged by this, but in the case of carbon fibers, carbon fibers with a diameter of 5 to 15 μm are used. For example, when a carbon fiber bundle is made of about 12,000 filaments, it is crushed so that the width in the lateral direction becomes about 5 mm.

The unidirectionally aligned hybrid reinforcing fiber sheet 1 of the present invention as described above can be manufactured, for example, as shown in FIG. 6.

That is, after applying adhesive on one side and the other side of the support sheet 2 supplied from the sheet supply roll 7 with adhesive application rolls 8a and 8b to provide an adhesive layer 3.5, the sheet 2 is
At the same time, the fiber bundles 4A of the first reinforcing fibers 4 having high rigidity are fed to the pressing part 9 from the reinforcing fiber supply roll 10a, and the fiber bundles 4A of the first reinforcing fibers 4 having high toughness are fed to the pressing part 9 from the reinforcing fiber supply roll lob.
The fiber bundles 6A of reinforcing fibers 6 are sent in, and the fiber bundles 4A are arranged in one direction on the adhesive layer 3 on the sheet 2, and
The fiber bundles 6A are arranged in one direction on top. Furthermore, the release paper 13a is transferred from the release paper roll 12a to the pressure unit 9.
The release paper 13b is sent in from b, and the release papers 13a and 13b are stacked on the fiber bundles 4A and 6A, respectively.

In this state, the pressure rollers 13a and 13b of the pressure unit 9
Pressure is applied to crush the fiber bundles 4A and 6A, and at the same time,
As a result, the slightly separated reinforcing fibers 4.6 are bonded onto one side and the other side of the sheet 2 via the adhesive layer 3.5. Thereafter, by winding up the release papers 12a and 12b with the release paper take-up rolls 14a and 14b, a high-rigid film is applied onto one side and the other side of the support sheet 2 via the adhesive layer 3.5, respectively. A unidirectionally arranged hybrid reinforcing fiber sheet 1 is obtained in which the first reinforcing fiber 4 and the second reinforcing fiber 6 having high toughness are arranged in one direction.

The reinforcing fiber sheet 1 is made of cover films 16a, 1 supplied from film supply rolls 15a, 15b as needed.
After the reinforcing fibers 4.6 are covered with the reinforcing fibers 6b, the sheet is wound up on a sheet winding roll 17.

In the present invention, as described above, the reinforcing fiber sheet 1 is used for reinforcement at reinforcement sites such as bridges and elevated roads by impregnating the reinforcing fibers 4.6 with a room-temperature curing matrix resin. For the matrix resin of the mold, an epoxy resin or the like is used, which is made by adjusting the blend of curing agents so that it hardens at room temperature. According to this, fiber-reinforced sheets l
The matrix resin can be cured and made into a fiber-reinforced plastic by leaving it as it is pasted.However, the present invention does not preclude the promotion of curing of the matrix resin by heat curing. .

According to the invention, the reinforcement of the construction is carried out as follows.

That is, in one embodiment of the present invention, the reinforcing fibers 4. on the unidirectionally arranged hybrid reinforcing fiber sheet 1 are applied at the site of reinforcing structures such as bridges and piers of elevated roads using appropriate application means such as rollers, brushes, and sprayers. 6 is coated with a room-temperature curing matrix resin and impregnated, and as shown in FIG.
Alternatively, the fiber-reinforced sheet 1 is pasted around the reinforced portion 18 with the side numbered 6 as the reinforced portion 18 side of the structure, and the desired number of sheets are laminated. Next, after impregnating the matrix resin with a hand roller, etc., wrap a pressure tape over it to cover it, and then leave it as it is to harden the matrix resin, converting the sheet 1 into a fiber-reinforced plastic. Just do it. This results in reinforcement of the structure by the hybrid fiber-reinforced plastic.

In another embodiment of the present invention, as shown in FIG. 8, a room-temperature curing matrix resin 19 is coated around the reinforced portion 18 to a thickness of, for example, about 1100 μ, and then the side of the reinforcing fibers 4 or 6 is reinforced. A desired number of unidirectionally arranged reinforcing fiber sheets 1 are stacked on the side of the portion 18, and the sheets 1 are attached by pressing, and at the same time, the reinforcing fibers 4 and 6 are impregnated with the matrix resin 19. In this case, if the support sheet 2 is not permeable to resin, each time the next sheet l is laminated on the previously laminated sheet 1,
A matrix resin may be further applied to the surface. Thereafter, in the same manner as described above, the laminated sheet 1 may be covered by wrapping a pressure tape or the like, and then left as is to harden the matrix resin, thereby forming the sheet 1 into a fiber-reinforced plastic. This likewise results in reinforcement of the construction with the hybrid fiber-reinforced plastic.

In yet another embodiment of the present invention, the unidirectionally aligned hybrid reinforcing fiber sheet 1 uses a support sheet 2 that is permeable to a resin. As shown in FIG. 9, first, a resin similar to the matrix resin is applied as a brimer 20 on the peripheral surface of the reinforced portion 18, and the desired number of sheets 1 are laminated on top of the brimer 20, and then the outermost layer is A room temperature curable matrix resin 19 is applied onto the sheet 1 using a roller or the like and permeated through the sheet 2, so that the matrix resin 19 is spread over the reinforcing fibers 4 and 6. After that,
Similarly to the above, the laminated sheet 1 may be covered with a pressure tape, etc., and then left as is to harden the matrix resin 17, thereby making the sheet 1 a fiber-reinforced plastic. This likewise results in reinforcement of the construction with the hybrid fiber-reinforced plastic.

The present invention is configured as described above. According to this, when reinforcing structures such as bridges and elevated roads using fiber-reinforced plastic, first and second reinforcing fibers are arranged in one direction on one side and the other side of a support sheet, respectively. Unidirectionally arranged hybrid reinforced fiber sheet 1
At the reinforcement site, the reinforcing fibers 4 and 6 are impregnated with a matrix resin that cures at room temperature, so a sheet l impregnated with the matrix resin is pasted around the reinforced area and left as is. By this, the sheet 1 can be made of fiber-reinforced plastic by curing the matrix resin, and reinforcement with fiber-reinforced plastic can be performed with good workability without the troublesome work of heating and hardening the matrix resin at the reinforcement site. Can be done.

However, in the hybrid reinforcing fiber sheet, the first reinforcing fibers 4 are reinforcing fibers with high rigidity and an elastic modulus of 5 tons/mm'' or more, and the second reinforcing fibers 6 are reinforcing fibers with a breaking elongation of 1.2.
% or more and 20% more than the elongation at break of the first reinforcing fiber 4
Since fiber-reinforced plastic is hybridized as reinforcing fibers with high toughness, the first reinforcing fibers 4 with high rigidity can increase the fracture strength of the structure and prevent cracks from occurring easily. On the other hand, the fracture toughness of the structure is increased by the second reinforcing fibers 6 having high toughness, and even if a crack occurs in the structure, it can be prevented from immediately breaking and the time required for the structure to break can be extended. In addition, reinforcing fiber 4
．． 6 are arranged in one direction, so there is no decrease in the strength of the fiber-reinforced plastic unlike when they are arranged in a cross pattern.

Furthermore, since the matrix resin is cured after the reinforcing fiber sheet is pasted around the reinforced area, reinforcement can be carried out even in curved reinforced areas.

Husband 11 Hiro 1 A specific example of the present invention will be described.

Carbon fiber was used as the first reinforcing fiber with high rigidity, and Bolieste staple fiber (trade name, Pectran: manufactured by Kuraray Co., Ltd.) was used as the second reinforcing fiber with high toughness. A hybrid reinforced fiber sheet was prepared by applying the fibers in one direction with polyester fibers on the other side, each with a yarn weight of 175 g/m''.

The elastic modulus of the carbon fiber used was 23.5 tons//mm"% as measured by the strand strength measurement method CJIS method.
The elongation is 1.4% and the modulus of elasticity of the polyester fiber is 8.
．． 5 tons/mm'', elongation is 3°9%.

The hybrid reinforced fiber sheet is made by impregnating the first and second reinforcing fibers with an epoxy resin that is cured at room temperature as a matrix resin, and then curing the matrix resin by leaving it at room temperature to form a hybrid fiber reinforced plastic. (The width of the test piece is 15 mm). Then, the test piece was tested by applying a vertical load, and the initial and final breaking loads, elongation, etc. at that time were determined, and the effect of using the hybrid reinforced fiber sheet of the present invention as a fiber reinforced plastic was investigated.

For comparison, the same carbon fibers as above were placed on one side and the other side of the support sheet at the same 175 g/m, respectively.
A reinforcing fiber sheet was prepared in one direction with a fiber weight of 100%, the carbon fibers were impregnated with a matrix resin, and after curing, the same tests as above were conducted.

The results obtained are shown in Table 1.

Table 1 shows the average value of 7 times, and the elongation shows the average value of 5 times. Also, the numbers in parentheses in those columns and the rigidity column are
This is a CV value indicating the degree of variation. Stiffness indicates the stiffness of the entire fiber-reinforced plastic and is expressed as load/elongation. The fracture energy was determined by drawing a stress expansion strain curve similar to that shown in FIGS. 2 and 3 above and calculating it graphically using triangular approximation.

As is clear from Table 1, in the case of the present invention, a hybrid reinforced fiber sheet of carbon fibers with high rigidity and polyester fibers with high toughness is used to create a hybrid fiber-reinforced plastic. Although the final breaking load was smaller than the comparative example using a fiber-only reinforced fiber sheet and non-hybridized fiber-reinforced plastic, the elongation and fracture energy were about 2.5 times larger. Even when the reinforcing fibers begin to break, they do not immediately reach final breakage, indicating that the safety of reinforcing structures with fiber-reinforced plastics is excellent.

Mendantatsudan 1 As explained above, in the present invention, the first reinforcing fibers with high rigidity and the second reinforcing fibers with high toughness are arranged in one direction on one side and the other side of the support sheet, respectively. Using a unidirectionally arranged hybrid reinforcing fiber sheet provided in the reinforcement site, the reinforcing fibers are impregnated with a room-temperature curing matrix resin and provided for reinforcement. By pasting it around the area and leaving it as it is, the matrix resin is cured and made into fiber-reinforced plastic without the troublesome work of heating and curing the matrix resin at the reinforcement site, making it easy to apply. Reinforcement can be performed. Moreover, it is possible to increase the fracture strength of the structure so that cracks do not easily occur, and it is also possible to increase the fracture toughness of the structure to prevent it from immediately breaking even if a crack occurs in the structure.

Furthermore, since the reinforcing fibers are arranged in one direction, the reinforcing strength of the resulting fiber-reinforced plastic can be improved. Furthermore, even if the reinforcement location is curved, reinforcement can be performed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the unidirectionally aligned hybrid reinforcing fiber sheet of the present invention. Figure 2 shows the results when a vertical load is applied to the surface of a hybridized fiber-reinforced plastic obtained from a hybrid reinforced fiber sheet in which reinforcing fibers with high rigidity and reinforcing fibers with high toughness are provided on the other surface. , is a graph schematically showing the stress-elongation strain curve of fiber-reinforced plastic. Figure 3 shows a similar case to Figure 2 in the case of a fiber-reinforced plastic obtained from a reinforced fiber sheet with one type of reinforcing fiber having higher stiffness but lower toughness than the above on the other side. It is a graph. FIG. 4(a) is a sectional view showing one aspect of how the reinforcing fiber bundles are arranged in the reinforcing fiber sheet of FIG. 1(a). FIG. 4(b) is a cross-sectional view showing the arrangement of reinforcing fibers obtained from the fiber bundle of FIG. 4(a). FIG. 5(a) is a sectional view showing another aspect of how the reinforcing fiber bundles are arranged in the reinforcing fiber sheet of FIG. 1(a). FIG. 5(b) is a cross-sectional view showing the arrangement of reinforcing fibers obtained from the fiber bundle of FIG. 5(a). FIG. 6 is an explanatory diagram showing an embodiment of the manufacturing method of the present invention. FIG. 7 is a sectional view showing an embodiment of the reinforcing method of the present invention. FIG. 8 is a sectional view showing another embodiment of the reinforcing method of the present invention. FIG. 9 is a sectional view showing still another embodiment of the reinforcing method of the present invention. 1: Reinforced fiber sheet 2: Support sheet 3: Adhesive layer 4.6: Reinforced fibers 4A, 6A: Fiber bundle 18: Reinforced portion 19: Matrix resin jf! Figure 1 Figure 4 Figure 5 Figure 2 Figure 3 Figure 6 Extension strain ε Extension strain ε Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1) a support sheet, first reinforcing fibers having high rigidity arranged in one direction and bonded on one surface of the support sheet via an adhesive layer; A unidirectional hybrid reinforcing fiber sheet comprising second reinforcing fibers with high toughness arranged in one direction and bonded to the other surface via an adhesive layer. 2) The elastic modulus of the first reinforcing fiber is 5 tons/mm^3 or more, and the elongation at break of the second reinforcing fiber is 1.2% or more and greater than the elongation at break of the first reinforcing fiber. The unidirectionally aligned hybrid reinforcing fiber sheet according to claim 1, which is 20% or more larger. 3) An adhesive layer is provided on one side and the other side of the support sheet, and first reinforcing fibers having high rigidity are arranged in one direction and adhered on one side of the sheet, and the support sheet A method for producing a unidirectionally aligned hybrid reinforcing fiber sheet, characterized in that second reinforcing fibers having high toughness are arranged in one direction and bonded to the other surface of the sheet. 4) The first and second reinforcing fibers are reinforced by arranging fiber bundles of these reinforcing fibers in one direction with or without gaps on the adhesive layer on one side and the other side of the sheet. 4. The method for producing a unidirectionally aligned hybrid reinforcing fiber sheet according to claim 3, wherein the fiber bundles are adhered to one side and the other side of the sheet by crushing and separating the fiber bundles from above. 5) An adhesive layer is provided on one side and the other side of the support sheet, and first reinforcing fibers having high rigidity are arranged in one direction and adhered on one side of the sheet, and the support sheet is bonded. A unidirectionally arranged hybrid reinforcing fiber sheet formed by arranging and bonding second reinforcing fibers with high toughness in one direction on the other side of the unidirectionally arranged hybrid reinforcing fiber sheet is attached to the first and second reinforcing fibers with a room-temperature curing matrix resin. 1. A method for reinforcing a structure, which comprises impregnating the matrix resin with the matrix resin, applying the matrix resin to the surface of the reinforced portion of the structure, and then curing the matrix resin. 6) An adhesive layer is provided on one side and the other side of the support sheet, and first reinforcing fibers having high rigidity are arranged in one direction and adhered to the one side of the sheet, and the support sheet is bonded. A unidirectionally arranged hybrid reinforcing fiber sheet is made by arranging and adhering second reinforcing fibers with high toughness in one direction on the other side of the structure, and a room temperature curing matrix resin is applied to the surface of the reinforced part of the structure. A method for reinforcing a structure, characterized in that the first and second reinforcing fibers are impregnated with the matrix resin, and then the matrix resin is cured. 7) providing an adhesive layer on one side and the other side of a resin-permeable support sheet, and adhering highly rigid first reinforcing fibers arranged in one direction on one side of the sheet; A unidirectionally arranged hybrid reinforcing fiber sheet, which is made by arranging and bonding second reinforcing fibers with high toughness in one direction on the other side of the support sheet, is pasted on the surface of the reinforced part of the structure, and then Infiltrating the reinforcing fiber sheet with a room temperature curable matrix resin to impregnate the first and second reinforcing fibers,
A method for reinforcing a structure, characterized in that the matrix resin is then cured.