JP2016216942A - Reinforcement sheet and reinforcement structure for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement sheet that reduces adhesion force to offer excellent reinforcing effect for a concrete structure, is formed long and rolled for easy carrying, and curtails installation time and reduces installation costs.SOLUTION: A reinforcement sheet 1 for a concrete structure includes: a non-liquid-permeable and flexible separator film 2; a first fibrous body 3 laminated on a surface of the separator film 2, the surface being on an adhesion side to a concrete structure 100; and a second fibrous body 4 laminated on the other surface of the separator film 2, the second fibrous body comprising a second reinforced fiber 32 having a Young's modulus value greater than that of a first reinforced fiber 31 contained in the first fibrous body 3. At least the second reinforced fiber 32 is fixed on the separator film 2 by sewing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing sheet for a concrete structure that reinforces a concrete structure such as a tunnel, an underground facility, and a building, and a reinforcing structure for a concrete structure.

  In recent years, existing concrete structures are composed of high-strength fibers such as carbon fibers and aramid fibers in order to degrade structural members over time, change standards, and demand for better performance. It is practiced to reinforce a concrete structure by adhering and fixing the FRP as a reinforcing material with an adhesive. In such a reinforcing structure, as long as the FRP and the concrete structure are integrated, a reinforcing effect based on the tensile strength of the FRP can be exhibited.

  Therefore, if FRP having high tensile strength is used, the reinforcing effect is enhanced. However, if FRP having high Young's modulus is used so that tensile strength can be increased, the difference between the Young's modulus of the concrete structure and FRP becomes large. When the difference in Young's modulus increases, when an external force is applied to the integrated concrete structure and FRP and distortion occurs, the difference in stress generated between the concrete structure and FRP also increases. A large adhesion stress is generated in the adhesive located at the interface of the FRP. When this adhesion stress exceeds the maximum adhesion strength of the adhesive, the adhesive peels off and the reinforcing effect by FRP disappears.

In order to avoid such a situation, when the basis weight of the carbon fiber of CFRP is designed so that the adhesion stress due to the stress difference is less than or equal to the maximum adhesion strength of the adhesive in the conventional CFRP construction, the maximum is approximately 600 g / m ² at maximum. It becomes. When a further reinforcing effect is required, CFRP is laminated and dealt with. However, in this CFRP laminated structure, the end part of the main reinforcement direction along the surface of the second-layer CFRP concrete structure In order to avoid applying an adhesive stress exceeding the maximum adhesive strength of the adhesive, it is necessary to shorten the CFRP of the second layer rather than the first layer on the concrete structure side, so the range to be reinforced is shortened. There is a problem.

  There exists a reinforcement structure of patent document 1 as a reinforcement structure which can eliminate this problem. In this reinforcing structure, a first FRP having a low Young's modulus reinforced with an aramid fiber other than carbon fiber is bonded to the surface of a concrete structure, and the Young's modulus is reinforced with carbon fiber and has a Young's modulus higher than that of the first FRP. The high second FRP is bonded to the first FRP. In this reinforcing structure, since the first FRP having a Young's modulus lower than that of the second FRP and higher than that of the concrete structure is laminated between the second FRP that bears the main reinforcement and the concrete structure, It is possible to reduce the adhesion stress of the adhesive at the interface.

  Moreover, there exists a reinforcement structure of patent document 2 as another reinforcement structure. This reinforcing structure is made by applying a synthetic resin buffer material having a specific tensile elongation and tensile strength on the surface of a concrete structure and curing it, and then FRP reinforced with carbon fiber or the like is applied thereon. Attaching and reducing adhesion stress.

JP-A-8-132556 JP 2002-79604 A

  By the way, the reinforcing structure of Patent Document 1 is formed by individually molding a first FRP having a low Young's modulus and a second FRP having a high Young's modulus and bonding them together to form a laminated reinforcing sheet. The laminated reinforcing sheet to which FRPs having different Young's moduli are bonded is difficult to bend easily. Therefore, it cannot be wound in a roll shape, and it is very difficult to carry a long laminated reinforcing sheet, and a short laminated reinforcing sheet is inevitably brought into the field.

  In such a short reinforcing sheet, when it is necessary to use the reinforcing sheet for a long time as a whole in order to reinforce the concrete structure in a wide range, the short reinforcing sheets are used by being joined to each other. However, unevenness is formed in the joint where the short reinforcing sheets are joined to each other, and the unevenness of the joint causes a case where installation is difficult depending on the location. In addition, when the existing concrete structure to be reinforced has steps or irregularities, there are cases where a short reinforcing sheet cannot be installed. Moreover, since it is necessary to perform the operation | work which joins a short reinforcement sheet | seat frequently, a construction period will be delayed.

  Moreover, since the reinforcement structure of patent document 2 affixes FRP after waiting for hardening of the apply | coated buffer material, while waiting for hardening time, a construction period takes longer than the conventional construction method, and the buffer material which has specific quality is expensive. Therefore, there is a problem that the construction cost increases.

  The present invention is proposed in view of the above problems, and can reduce adhesion stress and exhibit an excellent reinforcing effect, and can be easily formed in a series and wound into a roll. Further, it is an object of the present invention to provide a reinforcing sheet for a concrete structure capable of shortening the work period and reducing the construction cost, and a reinforcing structure for a concrete structure using the reinforcing sheet.

The reinforcing sheet for a concrete structure according to the present invention includes a separator film having liquid permeability and flexibility, and a first fibrous body laminated on one surface side of the separator film serving as an adhesion side to the concrete structure. And a second fibrous body composed of second reinforcing fibers having a Young's modulus higher than that of the first reinforcing fibers contained in the first fibrous body, and laminated on the other surface side of the separator film. And at least the second reinforcing fiber is attached so as to be along the separator film by sewing.
According to this, the adhesive stress can be reduced and an excellent reinforcing effect can be exhibited, and the first reinforcing fiber and the second reinforcing fiber composed of fibers having different Young's moduli are not directly bonded. Since it is integrated by sewing to the separator film having flexibility, the reinforcing sheet can be easily bent. Therefore, it can be easily carried out by being formed into a long series and wound in a roll shape and carried out efficiently. Moreover, it has a good drape property and is excellent in the followability to the concrete structure such as the followability to the curved portion, entering corner portion, and uneven portion of the concrete structure. In addition, the first fibrous body and the second fibrous body are separated by a separator film having a liquid-impervious property, thereby curing the adhesive that bonds the first fibrous body to the concrete structure, waiting for curing time, and the like. Without waiting for the completion of the work on one side of the separator film, the work process on the other side of the separator film such as application of the impregnating resin on the second fiber body side can be carried out, and the work period can be shortened. In addition, expensive materials such as cushioning materials having a specific quality are not required, and the construction period is shortened, so that the construction cost can be reduced.

The reinforcing sheet for a concrete structure of the present invention is characterized in that a nonwoven fabric that can be impregnated with a synthetic resin is laminated on the other surface side of the separator film, and the second reinforcing fibers are provided outside the nonwoven fabric. And
According to this, it is possible to impregnate the nonwoven fabric with the impregnating resin and adhere it with high strength to ensure that the impregnating resin stays, and it is possible to reliably obtain the reinforcing effect due to the performance of the impregnating resin.

Reinforcing sheet of concrete structure of the present invention is characterized in that the basis weight of the nonwoven fabric is ^{10g / m 2 ~50g / m 2} .
According to this, the non-impregnated portion of the nonwoven fabric that can be impregnated with the resin can be secured more than the required amount by the nonwoven fabric having a basis weight of 10 g / m ² or more, and the adhesion strength of the impregnated resin can be more reliably increased. The nonwoven fabric having a basis weight of m ² or less can surely prevent an unimpregnated portion that cannot be completely impregnated with the resin from remaining and being damaged from the unimpregnated portion.

The reinforcing sheet for a concrete structure of the present invention is characterized in that the separator film has a thickness of 5 μm to 50 μm.
According to this, by setting the thickness of the separator film to 5 μm or more, it is possible to surely avoid the situation where the separator film tears during sewing processing, and by setting the thickness to 50 μm or less, the concrete structure The flexibility necessary for following can be reliably obtained.

The reinforcing sheet for a concrete structure according to the present invention is characterized in that a tensile rigidity per unit width of the first reinforcing fiber is 0.05 to 5% with respect to that of the second reinforcing fiber.
According to this, by setting the tensile rigidity of the first reinforcing fiber to 0.05% or more, the reinforcing effect can be surely obtained, and by setting the tensile rigidity of the first reinforcing fiber to 5% or less. Further, it is possible to avoid the possibility that the stress generated in the first fibrous body is dragged to the second fibrous body and peeled off or damaged by the adhesive that bonds the reinforcing sheet and the concrete structure.

The reinforcing structure of the concrete structure of the present invention is such that the first fiber body of the reinforcing sheet of the present invention is bonded to the concrete structure with an adhesive resin, and the second fiber body is attached to the second fiber body side. An impregnation resin layer to be impregnated is provided.
According to this, the reinforcement structure from which the effect of the reinforcement sheet of this invention is acquired reliably can be obtained.

  According to the present invention, the first reinforcing fiber and the second reinforcing fiber composed of fibers having different Young's moduli can be directly bonded while reducing the adhesion stress and exhibiting an excellent reinforcing effect. Therefore, it is possible to obtain a reinforcing sheet that is integrated by sewing on a flexible separator film and can be bent easily. Therefore, the reinforcing sheet can be formed in a series of long lengths, wound into a roll, and carried for efficient construction. In addition, the reinforcing sheet has good drapability and is excellent in followability to the concrete structure such as followability to a curved portion, a corner portion, and an uneven portion of the concrete structure.

  In addition, the first fibrous body and the second fibrous body are separated by a separator film having a liquid-impervious property, thereby curing the adhesive that bonds the first fibrous body to the concrete structure, waiting for curing time, and the like. Without waiting for the completion of the work on one side of the separator film, the work process on the other side of the separator film such as application of the impregnating resin on the second fiber body side can be carried out, and the work period can be shortened. In addition, expensive materials such as cushioning materials having a specific quality are not required, and the construction period is shortened, so that the construction cost can be reduced.

(A) is a perspective view which shows the reinforcement sheet | seat of the concrete structure of embodiment by this invention, (b) is the longitudinal cross-sectional view. The longitudinal cross-sectional view which shows the state which adhered the reinforcement sheet | seat of the concrete structure of embodiment to the concrete structure. The longitudinal cross-sectional view which shows the reinforcement structure of the concrete structure of embodiment by this invention. (A) is a longitudinal cross-sectional view which shows the reinforcement sheet | seat of the concrete structure of the modification by this invention, (b) is a longitudinal cross-sectional view which shows the reinforcement structure of the concrete structure of the modification by the reinforcement sheet.

[Reinforcement sheet for concrete structure of embodiment and reinforcement structure for concrete structure]
As shown in FIG. 1, a reinforcing sheet 1 for a concrete structure according to an embodiment of the present invention includes a separator film 2 having no liquid permeability and a first fibrous body 3 laminated on one surface side of the separator film 2. And the second fiber body 4 laminated on the other surface side of the separator film 2, and one surface side of the separator film 2 on which the first fiber body 3 is laminated is directed to the concrete structure 100 described later. It becomes the adhesion side.

  The separator film 2 can be formed of an appropriate material having liquid-imperviousness and flexibility. For example, a synthetic resin film such as a polyester film, a polyethylene film, or a nylon film is preferable. From the viewpoint of ease of lamination processing and strength, the polyester film is excellent. Moreover, it is preferable that the thickness of the separator film 2 formed of a polyester film or the like is 5 μm to 50 μm, and by setting the thickness to 5 μm or more, it is possible to reliably avoid a situation where the separator film is torn during sewing processing. When the thickness is 50 μm or less, the flexibility necessary for following the concrete structure can be reliably obtained. More preferably, the thickness is 12 μm to 38 μm, and in the illustrated example, it is 12 μm.

  In the present embodiment, the first fibrous body 3 is composed of a first reinforcing fiber 31 and a first nonwoven fabric 32 provided so that the first reinforcing fiber 31 is embedded, It is laminated on one surface side of the separator film 2 by adhesion in the adhesive layer 5. The first reinforcing fiber 31 is composed of a fiber having a Young's modulus lower than that of the second reinforcing fiber 41 to be described later. In the illustrated example, the first reinforcing fibers 31 are arranged so as to be aligned in one direction. However, the first reinforcing fibers 31 may be configured to be arranged so as to be aligned in two directions or three or more directions so as to intersect.

The first nonwoven fabric 32 is made of, for example, a polyester nonwoven fabric formed of polyester fibers of short fibers, and a portion of the first nonwoven fabric 32 from the outer side opposite to the separator film 2 is impregnated with a synthetic resin such as an adhesive. It is possible. By setting the basis weight of the first nonwoven fabric 32 to 10 g / m ² or more, the unimpregnated portion of the nonwoven fabric that can be impregnated with the synthetic resin can be secured more than the required amount, and the adhesion strength of the impregnated resin can be more reliably increased. can, by a 50 g / ^{m 2} or less, because it can reliably prevent the unimpregnated portion of the resin is not completely impregnated being damaged from unimpregnated portion ^{remains, 10g / m 2 ~50g / m} 2 It is preferable that

The first fibrous body 3 is formed by, for example, thermocompression bonding or bonding the first nonwoven fabric 32 to a fiber sheet in which the first reinforcing fibers 31 are aligned in one direction. As a specific example of the first fibrous body 3, the first reinforcing fibers 31 are arranged in one direction with polyester fibers (1670 dtex, Young's modulus of 15,000 N / mm ² ) and are provided with a number of 120 driven per 1 m width, A polyester nonwoven fabric (30 g / m ² ) corresponding to the first nonwoven fabric 32 can be integrally formed by thermocompression bonding.

  The tensile rigidity of the first reinforcing fiber 31 is preferably 0.05 to 5% with respect to the tensile rigidity of the second reinforcing fiber 41 to be described later. A reinforcing effect can be obtained with certainty, and by setting it to 5% or less, the stress generated in the first fibrous body 3 is dragged to the second fibrous body 4 to bond the reinforcing sheet 1 and the concrete structure 100 together. It is possible to avoid the possibility of peeling and breakage due to the agent. The fibers of the first reinforcing fibers 31 are good when the tensile rigidity is equal to or higher than that of the fibers constituting the first nonwoven fabric 32, and more preferably, the first reinforcing fibers 31 are the first fibers. What has higher tensile rigidity than the fiber which comprises the nonwoven fabric 32 of this may be used.

  In the present embodiment, the second fibrous body 4 is laminated on the separator film 2 side of the second reinforcing fiber 41 and the second reinforcing fiber 41 so that the second reinforcing fiber 41 is placed thereon. The second nonwoven fabric 42 is laid, and the second nonwoven fabric 42 is bonded to the other surface side of the separator film 4 by the adhesive layer 6. As the second reinforcing fiber 41, a reinforcing fiber having a Young's modulus higher than that of the first reinforcing fiber 31 is used. For example, a carbon fiber is preferable, but an aramid fiber, a PBO fiber, an ultra-high density polyethylene fiber, a glass is used. It is good also as a fiber etc. In the illustrated example, the second reinforcing fibers 42 are arranged in the same direction as the first reinforcing fibers 31 and arranged in one direction. However, the second reinforcing fibers 42 are arranged so as to be arranged in two directions so as to intersect with each other. It is also possible.

The second nonwoven fabric 42 is made of, for example, a polyester nonwoven fabric formed of short polyester fibers, and at least a portion of the second nonwoven fabric 42 from the second reinforcing fibers 41 can be impregnated with a synthetic resin. . By setting the basis weight of the second nonwoven fabric 42 to 10 g / m ² or more, an unimpregnated portion of the nonwoven fabric that can be impregnated with the synthetic resin can be secured more than a required amount, and the adhesion strength of the impregnated resin can be more reliably increased. can, by a 50 g / ^{m 2} or less, because it can reliably prevent the unimpregnated portion of the resin is not completely impregnated being damaged from unimpregnated portion ^{remains, 10g / m 2 ~50g / m} 2 It is preferable that

The first fibrous body 3 and the second nonwoven fabric 42 are laminated and fixed on one surface side and the other surface side of the separator film 2 by dry lamination on both surfaces. Reference numerals 5 and 6 are adhesive layers formed by a dry laminate manufacturing method. Then, the second reinforcing fiber 41 is sewn with the sewing thread 7 by the sewing to the separator film 2, the first fiber body 3, and the second nonwoven fabric 42 integrated by the adhesive layers 5 and 6. It is attached along the film 2. For example, as the second reinforcing fiber 41, a carbon fiber sheet (Young's modulus of 2.45 × 10 ⁵ N / mm ² , basis weight of 1000 g / m ² or more) in which high-strength carbon fibers are aligned in one direction is the second. It is placed on the non-woven fabric 42, is sewn by a stitching machine or a quilting machine, and is attached to the separator film 2 with a sewing thread 7 of 56 dtex polyester or the like. The second reinforcing fibers 41 to be sewn are a fiber sheet obtained by impregnating and fixing a small amount of resin to reinforcing fibers arranged in a predetermined direction, and a fiber sheet in which reinforcing fibers arranged in a predetermined direction are integrated with an auxiliary thread. It is possible to simply use reinforcing fibers arranged in a predetermined direction, woven fabric or braided fabric in which fibers are arranged in two or three directions.

  The reinforcing sheet 1 thus formed is composed of the first fibrous body 3 composed of the first reinforcing fibers 31 and the second fibrous body 4 composed of the second reinforcing fibers 41. Since it is not bonded over the entire area and is integrated by sewing, it has the flexibility of being easily wound up to about 100 m. In addition, it is preferable that the fiber of the 2nd reinforcement fiber 41 shall be a thing with higher tensile rigidity than the fiber which comprises the 2nd nonwoven fabric 42. FIG.

When the reinforcing structure 1 of the concrete structure of the present embodiment is formed with the reinforcing sheet 1, after performing ground treatment on the surface of the portion to be reinforced of the concrete structure 100, such as removing the fragile layer and smoothing the unevenness, Apply primer. As shown in FIG. 2, the primer penetrates the surface of the concrete structure 100 to form the primer layer 11, and acts to strengthen the concrete surface and at the same time increase the adhesive force with the adhesive resin. As the primer, a primer having high affinity with the adhesive resin is selected, and for example, an epoxy resin having a viscosity of 1700 mPa · s is applied at 0.15 kg / m ² .

Thereafter, as shown in FIG. 2, an adhesive resin is applied on the primer layer 11 to form an adhesive resin layer 12. Since the reinforcement to the concrete structure 100 is often an upper surface construction, the adhesive resin is difficult to droop, the quality that the required amount of resin is applied to the surface to be smoothly reinforced, and the second nonwoven fabric 42 of the reinforcing sheet 1 It is preferable to have a quality that penetrates securely and a quality that firmly bonds the concrete structure 100 and the reinforcing sheet 1 after curing. For example adhesion between concrete paste as an adhesive resin with a 1.5 N / mm ² or more epoxy resin to form an adhesive resin layer 12 is applied at 0.7 kg / ^{m 2.} If an acrylic resin having the same properties is used as the adhesive resin, the reaction is started even at low temperature, so that it is possible to execute in the severe winter season.

  Before the adhesive resin is cured, the first nonwoven fabric 32 side of the first fibrous body 3 of the reinforcing sheet 1 is pressed against the adhesive resin so that the first nonwoven fabric 32 is impregnated with the adhesive resin. The reinforcing sheet 1 is attached to the concrete structure 100 via the layer 12. That is, the first fibrous body 3 is bonded with an adhesive resin, and the reinforcing sheet 1 is attached with the first fibrous body 3 side set to the concrete structure 100 side.

Further, as shown in FIG. 3, in the reinforcing sheet 1 laminated via the adhesive resin layer 12, the impregnating resin layer 13 that impregnates the second fibrous body 4 on the second fibrous body 4 side of the separator film 2 is provided. Provided. The impregnating resin forming the impregnating resin layer 13 preferably has an impregnation property for the second reinforcing fiber 41, an impregnation property for the second nonwoven fabric 42, and its own toughness. For example, a thixotropic agent is used. Using the added epoxy resin (the performance of the impregnated resin alone after curing is such that the bending strength is 50 N / mm ² or more, the tensile strength is 40 N / mm ² or more, and the tensile shear strength is 40 N / mm ² or more) Apply and impregnate at ² kg / m ² . Thereby, the reinforcement structure of the concrete structure in which the impregnation resin layer 13 was formed is formed.

  According to the present embodiment, the first reinforcing fiber 31 and the second reinforcing fiber 41 made of reinforcing fibers having different Young's moduli can be directly exhibited while reducing the adhesion stress and exhibiting an excellent reinforcing effect. Since it is integrated by sewing on the flexible separator film 2 without being bonded, the reinforcing sheet 1 can be easily bent. Therefore, it can be easily carried out by being formed into a long series and wound in a roll shape and carried out efficiently. Moreover, it has a good drape property and is excellent in the followability to the concrete structure such as the followability to the curved portion, entering corner portion, and uneven portion of the concrete structure.

  Further, the first fibrous body 3 and the second fibrous body 4 are separated by the separator film 2 having a liquid-impervious property, thereby curing the adhesive resin that adheres the first fibrous body 3 to the concrete structure 100. Without waiting for the completion of the work on one side of the separator film 2 such as waiting for the curing time, the work process on the other side of the separator film 2 such as application of the impregnating resin on the second fiber body 4 side can be performed. Shortening can be achieved. In addition, expensive materials such as cushioning materials having a specific quality are not required, and the construction period is shortened, so that the construction cost can be reduced.

  In addition, the first nonwoven fabric 32 and the second nonwoven fabric 42 can be impregnated with an adhesive resin and an impregnating resin and adhered with high strength. Therefore, the reinforcing sheet 1 can be reliably bonded to the concrete structure 100, and the impregnated resin can be reliably retained, and the reinforcing effect due to the performance of the impregnated resin can be reliably obtained.

[Modifications of Embodiment, etc.]
The invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification, in addition to the respective inventions, embodiments, and examples, to the extent applicable. Those that are specified by adding other configurations disclosed in this specification to these configurations, or those that have been identified by deleting these partial configurations to the extent that partial effects can be obtained and specifying them The following modifications are also included.

  For example, in the reinforcing sheet of the present invention, the first fibrous body is laminated on one surface side of the separator film having liquid permeability and flexibility, and the second fibrous body is laminated on the other side, Of the second reinforcing fiber having a Young's modulus higher than that of the first reinforcing fiber included in the first fibrous body, and at least the second reinforcing fiber is attached so as to be along the separator film by sewing. Appropriate configurations are included, including the reinforcing sheet 1a of the modification shown in FIG.

  The reinforcing sheet 1a in FIG. 4 includes the same separator film 2, the first reinforcing fibers 31, and the second reinforcing fibers 41 as in the above embodiment, and the first fibrous body 3a is one of the separator films 2. The first reinforcing fiber 31 is laminated on the surface side, and the second fibrous body 4 a is constituted by the second reinforcing fiber 41 laminated on the other surface side of the separator film 2. The first reinforcing fiber 31 is attached along the separator film 2 with a sewing thread 71 by sewing, and the second reinforcing fiber 41 is attached along the separator film 2 with a sewing thread 72 by sewing. ing. The sewing threads 71 and 72 can be appropriately used the same as the sewing thread 7.

  In the reinforcing structure of the concrete structure 100 by the reinforcing sheet 1a, for example, a primer is applied to the surface of the concrete structure 100 to form a primer layer 11, and an adhesive resin is applied thereon to apply the first fiber body 3a or the first fiber body 3a. The reinforcing sheet 1a is disposed so that one reinforcing fiber 31 is impregnated with the adhesive resin, and the first fiber body 3a or the first reinforcing fiber 31 and one surface of the separator film 2 are interposed via the adhesive resin layer 12a. And fixed to the concrete structure 100.

  Further, in the reinforcing sheet 1a laminated via the adhesive resin layer 12a, the impregnating resin layer 13 impregnating the second fibrous body 4a or the second reinforcing fiber 41 on the second fibrous body 4a side of the separator film 2 is provided. And a reinforcing structure is formed. In addition, as the primer for forming the primer layer 11, the adhesive resin for forming the adhesive resin layer 12a, and the impregnating resin for forming the impregnating resin layer 13, the same materials as those in the above embodiment can be used as appropriate. .

  The present invention can be used when reinforcing concrete structures such as tunnels, underground facilities, and buildings.

DESCRIPTION OF SYMBOLS 1, 1a ... Reinforcement sheet 2 ... Separator film 3, 3a ... 1st fiber body 31 ... 1st reinforcement fiber 32 ... 1st nonwoven fabric 4, 4a ... 2nd fiber body 41 ... 2nd reinforcement fiber 42 ... Second nonwoven fabric 5, 6 ... Adhesive layer 7, 71, 72 ... Sewing thread 11 ... Primer layer 12, 12a ... Adhesive resin layer 13 ... Impregnated resin layer 100 ... Concrete structure

Claims (6)

A separator film having liquid permeability and flexibility;
A first fibrous body laminated on one surface side of the separator film to be bonded to a concrete structure;
Comprising a second reinforcing fiber having a Young's modulus higher than the first reinforcing fiber contained in the first fibrous body, and being laminated on the other surface side of the separator film, and
A reinforcing sheet for a concrete structure, wherein at least the second reinforcing fibers are attached along the separator film by sewing. A nonwoven fabric that can be impregnated with a synthetic resin is laminated on the other surface side of the separator film,
The reinforcing sheet for a concrete structure according to claim 1, wherein the second reinforcing fibers are provided outside the non-woven fabric. Reinforcing sheet of claim 2 concrete structure of wherein the basis weight of the nonwoven fabric is ^{10g / m 2 ~50g / m 2} .   The reinforcing sheet for a concrete structure according to claim 1, wherein the separator film has a thickness of 5 μm to 50 μm.   The concrete structure according to any one of claims 1 to 4, wherein a tensile rigidity per unit width of the first reinforcing fiber is 0.05 to 5% with respect to that of the second reinforcing fiber. Reinforcing sheet of things. The first fibrous body of the reinforcing sheet according to any one of claims 1 to 6 is bonded to a concrete structure with an adhesive resin,
A reinforcing structure for a concrete structure, wherein an impregnating resin layer for impregnating the second fibrous body is provided on the second fibrous body side.

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