JP6128597B2 - Reinforcement structure and reinforcement method for concrete structures - Google Patents

Description

  The present invention relates to a reinforcing structure and a reinforcing method for a concrete structure that reinforces a concrete structure such as a tunnel, a bridge, a pier, an elevated road, and a building.

  In concrete structures such as tunnels, if cracks and corrosion of built-in reinforcing bars progress due to deterioration over time, the proof stress may decrease, leading to an accident of peeling or peeling off of the concrete block. Therefore, the concrete structure has been conventionally reinforced, and a typical method is a CFRP method.

  In the CFRP method, the carbon fiber sheet is bonded and integrated with the impregnated adhesive while impregnating the carbon fiber sheet with an impregnated adhesive such as an epoxy resin on the surface of the concrete structure. It is a method of carrying out impregnation, adhesion and reinforced plastics simultaneously.

  Further, there is a method disclosed in Patent Document 1 as a modified method of the CFRP method for the purpose of improving the strength of the reinforcing layer. This method uses a protective sheet composed of a nonwoven fabric and a fiber yarn net such as carbon fiber, and applies an impregnating adhesive as the first layer to the surface of the concrete structure, and the nonwoven fabric surface is the surface side as the second layer. The protective sheet is arranged so that the thread net is on the concrete side, impregnated with the first layer of the impregnating adhesive, and bonded together, and the impregnating adhesive is applied as the third layer to impregnate the protective sheet and the first layer The reinforcing layer in which the first layer to the third layer are integrated is formed by bonding with the above impregnated adhesive.

JP2013-19146A

  By the way, the CFRP method and the method disclosed in Patent Document 1 perform “impregnation of carbon fibers” and “adhesion of carbon fibers” simultaneously with an impregnation adhesive having impregnation properties and adhesion properties. In the properties required for improving the adhesiveness and the properties required for improving adhesiveness, there are parts that conflict with the cure speed, viscosity, etc., so the adhesive used should be of a property that can exhibit both impregnation and adhesiveness within an acceptable range. Limited. That is, there is a portion that is sacrificed for either or both of the strength due to impregnation and the adhesive strength.

  This invention is proposed in view of the said subject, and it aims at providing the reinforcement structure and reinforcement construction method of a concrete structure which can fully exhibit the characteristic excellent in both the intensity | strength by an impregnation, and adhesive strength. .

The reinforcing structure for a concrete structure of the present invention is provided by laminating an adhesive layer bonded to the surface of the concrete structure, a separator bonded to the adhesive layer, and a surface of the separator opposite to the adhesive layer. A substantially planar reinforcing fiber portion and an impregnated layer impregnating the reinforcing fiber portion, wherein the separator separates the adhesive layer side and the impregnated layer side so as not to penetrate.
According to this, the separator separates the adhesive layer side and the impregnated layer side so as not to penetrate, thereby forming the reinforcing fiber portion and the impregnated layer in a high strength impregnated state with an impregnating agent having a very excellent impregnation property. In addition, it is possible to bond the separator to the surface of the concrete structure with high adhesive strength with an adhesive having a very excellent adhesiveness. Therefore, it is possible to maximize the excellent properties in both the strength by the impregnation and the adhesive strength. Furthermore, since it is possible to use an impregnating agent excellent in impregnation property for impregnation of the reinforcing fiber part, the reinforcing fiber part can be formed with a larger amount of fabric weight, and the strength of the reinforcing fiber part itself can be increased. it can. Furthermore, by separating the adhesive layer side and the impregnated layer side, it is possible to obtain a fast and stable adhesive state as required using an adhesive with a fast curing speed, and workability can be improved using an adhesive that is difficult to sag. Further, it is possible to make it difficult to cause shear adhesion peeling on the adhesive surface with a required adhesive, and it is also possible to obtain an effect of easily deriving the tensile strength inherent to the reinforcing fiber with the required impregnating agent.

The reinforcing structure for a concrete structure according to the present invention is characterized in that a part of the reinforcing fiber portion on the separator side is partially bonded to the separator.
According to this, the reinforcing fiber portion can be stably fixed to the separator, and the required impregnation property of the reinforcing fiber portion can be ensured by partial adhesion.

The reinforcing structure for a concrete structure according to the present invention is characterized in that the separator has a structure in which a nonwoven fabric is laminated on both sides of a separation layer.
According to this, the non-woven fabric on the surface of the separating layer on the concrete structure side can increase the adhesive strength with the adhesive layer, and the non-woven fabric on the surface of the separating layer on the reinforcing fiber portion side can bond with the reinforcing fiber portion. Strength can be increased.

The reinforcing structure for a concrete structure according to the present invention is characterized in that the separator includes a nonwoven fabric and a separation layer made of a resin cured in a state in which a part of the nonwoven fabric is impregnated.
According to this, when the nonwoven fabric is provided on the surface of the separation layer on the concrete structure side, the adhesive strength with the adhesive layer can be increased, and the nonwoven fabric is provided on the surface of the separation layer on the reinforcing fiber portion side. In this case, the adhesive strength with the reinforcing fiber portion can be increased, and when a nonwoven fabric is provided on both of them, the adhesive strength with respect to both the adhesive layer and the reinforcing fiber portion can be increased. Moreover, the separation layer and the nonwoven fabric can be firmly fixed by curing the separation layer in a state where a part of the nonwoven fabric is impregnated. In addition, a laminating adhesive and its application are not required for fixing the separation layer and the nonwoven fabric, and the cost can be reduced and the production efficiency of the separator can be improved.

The reinforcing structure for a concrete structure according to the present invention is characterized in that the reinforcing fiber portion is sewn to the separator.
According to this, a partial adhesive layer made of an adhesive can be omitted with respect to a configuration in which the reinforcing fiber part is partially bonded to the separator, and the reinforcing fiber part and the separator are more flexible without being limited in shape by the cured adhesive. It can be very flexible, and can be bent and bent into various shapes, and can be securely installed so as to adapt to the uneven portions and curved portions of the structure.

The reinforcing structure of a concrete structure according to the present invention is such that the separator has a structure in which a nonwoven fabric is laminated at least on the surface of the separating layer, and the reinforcing fiber portion penetrates the separating layer of the separator. Then, it is sewn with a sewing thread that is passed through the nonwoven fabric on the adhesive layer side.
According to this, the reinforcing fiber portion can be sewn with high strength and stability by using the nonwoven fabric on the surface of the separation structure on the concrete structure side while increasing the adhesive strength with the adhesive layer.

The reinforcing structure for a concrete structure according to the present invention is characterized in that a nonwoven fabric is laminated on the surface of the separating layer on the reinforcing fiber portion side.
According to this, when the reinforcing fiber part is impregnated with the impregnating agent, the impregnating agent can be adsorbed to the non-woven fabric on the surface of the reinforcing fiber part so that the impregnating agent can be reliably retained in the reinforcing fiber part and the separator. Can be reliably prevented from occurring.

The reinforcing structure for a concrete structure according to the present invention is characterized in that the reinforcing fiber portion is made of tow or filament.
According to this, it is possible to sew a desired amount of tow or filament to form a reinforcing fiber portion without using a fabric having a predetermined amount of reinforcing fiber, and freely adjust the amount of reinforcing fiber as required. The reinforcing fiber part such as strength can be obtained flexibly.

The concrete structure reinforcing structure according to the present invention is characterized in that the thickness of the separation layer is 12 to 250 μm.
According to this, by setting the thickness of the separation layer to 12 to 250 μm, the required strength and durability can be ensured, and the reinforcing sheet composed of the separator or the separator and the reinforcing fiber portion in the concrete structure. Necessary flexibility and followability can be ensured when installing.

The reinforcing structure of a concrete structure according to the present invention is characterized in that the basis weight of each of the nonwoven fabrics is 10 to 50 g / m ² .
According to this, by setting the basis weight of the nonwoven fabric to 10 to 50 g / m ² , it is possible to reliably obtain the required adhesive strength for the adhesive layer on the concrete structure side or the partial adhesive layer to which the reinforcing fiber part is bonded. , It is possible to bond the nonwoven fabric with the adhesive layer on the concrete structure side or the partial adhesive layer that adheres the reinforcing fiber part sufficiently, and the impregnation is insufficient, and voids are generated, and peeling or destruction occurs from the voids. Can be prevented. Alternatively, the required fixing strength can be obtained more reliably, and the impregnating agent can be more easily adsorbed by the non-woven fabric fibers so that the impregnating agent can be retained more easily, and generation of voids, separation from the voids, and occurrence of breakage can be more reliably Can be prevented.

The method for reinforcing a concrete structure according to the present invention comprises a step of applying an adhesive to the surface of the concrete structure, and a substantially planar reinforcing fiber portion is laminated on one side of the separator where the adhesive and impregnating agent cannot penetrate. A step of adhering the separator with the adhesive, and a step of applying an impregnating agent to the reinforcing fiber part of the reinforcing sheet to impregnate the reinforcing fiber part. It is characterized by that.
According to this, the reinforcing fiber portion and the impregnated layer in a high strength impregnation state with the impregnating agent having the property of being very excellent in impregnation property are made impossible to penetrate the adhesive on the concrete structure side and the impregnating agent on the opposite side with the separator. It becomes possible to form the separator, and it is possible to bond the separator to the surface of the concrete structure with high adhesive strength with an adhesive having a very excellent adhesiveness. Therefore, it is possible to maximize the excellent properties in both the strength by the impregnation and the adhesive strength. Furthermore, since it is possible to use an impregnating agent excellent in impregnation property for impregnation of the reinforcing fiber part, the reinforcing fiber part can be formed with a larger amount of fabric weight, and the strength of the reinforcing fiber part itself can be increased. it can. Furthermore, by separating the adhesive and impregnating agent so that they cannot permeate, it is possible to obtain a fast and stable adhesive state as required using an adhesive with a fast curing speed, and to improve workability with an adhesive that is difficult to sag. In addition, it is possible to make it difficult to cause shear adhesion peeling on the adhesive surface by a required adhesive, and it is also possible to easily derive the tensile strength inherent to the reinforcing fiber by the required impregnating agent.

  According to the present invention, it is possible to maximize the characteristics excellent in both the strength by the impregnation and the adhesive strength.

The schematic cross section which shows the reinforcement structure of the concrete structure of 1st Embodiment by this invention. The typical fragmentary sectional view which shows the reinforcement sheet | seat in the reinforcement structure of the concrete structure of 1st Embodiment. (A)-(c) is a schematic cross-section explanatory drawing which shows the construction procedure of the reinforcement method of the concrete structure of 1st Embodiment. The schematic cross section which shows the reinforcement structure of the concrete structure of 2nd Embodiment by this invention. The typical fragmentary sectional view which shows the reinforcement sheet | seat in the reinforcement structure of the concrete structure of 2nd Embodiment. The perspective explanatory view showing the reinforcement sheet in the reinforcement structure of the concrete structure of a 2nd embodiment. (A) is partial sectional explanatory drawing explaining the example of the structural material of the reinforcement fiber part in 2nd Embodiment, (b) is partial sectional explanatory drawing explaining the example. (A)-(c) is a schematic cross-section explanatory drawing which shows the construction procedure of the reinforcement construction method of the concrete structure of 2nd Embodiment. The perspective explanatory view showing the modification of the reinforcing sheet in the second embodiment.

[Reinforcement structure and reinforcement method for concrete structure of first embodiment]
As shown in FIG. 1, the reinforcing structure for a concrete structure according to the first embodiment of the present invention includes an adhesive layer 1 bonded to a surface 10 a of a concrete structure 10 such as a tunnel, and a separator bonded to the adhesive layer 1. 2, a substantially planar reinforcing fiber portion 3 provided on the surface opposite to the adhesive layer 1 of the separator 2, and an impregnated layer 4 impregnated with the reinforcing fiber portion 3. The separator 2 is on the adhesive layer 1 side. And the impregnated layer 4 side are separated so as not to penetrate.

  The adhesive layer 1 is formed by applying a primer to the surface 10a of the concrete structure 10 as necessary and then applying an adhesive. As the adhesive for forming the adhesive layer 1, for example, an epoxy resin-based or acrylic resin-based adhesive having properties such as a curing rate and a viscosity excellent in adhesiveness is used so that high adhesive strength can be obtained. It is done. Moreover, the adhesive layer 1 of this example is formed so as to impregnate a nonwoven fabric 22 on one surface of the separator 2 described later, and the adhesive strength with the separator 2 is enhanced.

  The separator 2 constitutes a reinforcing sheet together with a reinforcing fiber portion 3 to be described later, and as shown in FIG. 2, non-woven fabrics 22 and 23 are laminated and fixed on both surfaces of the separation film 21 corresponding to the separation layer in this example, respectively. Configured. The method for fixing the nonwoven fabrics 22 and 23 to the separation film 21 is appropriate such as adhesion. For example, the resin is cured in a state where the nonwoven fabrics 22 and 23 are impregnated, and the cured resin is used as the separation film 21. When the non-woven fabrics 22 and 23 are fixed by curing, the separation film 21 and the non-woven fabrics 22 and 23 can be firmly fixed, and a laminating adhesive and its application are applied to the separation film 21 and the non-woven fabrics 22 and 23. This is suitable because it can reduce costs and improve the production efficiency of the separator 2.

  The separation film 21 can be formed of an appropriate material capable of separating the adhesive for forming the adhesive layer 1 and the impregnating agent for forming the impregnation layer 4 described later so as to be impermeable, for example, a polyester film or the like. . If the thickness of the separation film 21 such as a polyester film is less than 12 μm, it is difficult to ensure the required strength and durability, and if it exceeds 500 μm, the required flexibility and follow-up when installing on the surface 10 a of the concrete structure 10. Since it becomes difficult to ensure the property, the thickness is preferably 12 μm to 500 μm, more preferably 12 to 250 μm.

The non-woven fabrics 22 and 23 can be made of an appropriate material and basis weight that can be impregnated into the adhesive layer 1 and the like to increase the adhesive strength. For example, the non-woven fabrics 22 and 23 such as polyester fibers can be used. When the basis weight of the nonwoven fabrics 22 and 23 such as polyester fibers is less than 10 g / m ^2, it is difficult to ensure the required adhesive strength for the adhesive layer 1 or the partial adhesive layer 5 to which the reinforcing fiber part 3 described later is bonded. the m ² than the partial adhesive layer 5 for adhering the adhesive layer 1 or the reinforcing fiber unit 3 is sufficiently impregnated into the nonwoven fabric, since it is difficult to adhere to suppress voids that cause peeling or destruction, 10 g / m it is preferably set to ^{2 ~100g} / ^{m 2,} more preferably or equal to 10 to 50 g / ^{m 2.}

  The substantially planar reinforcing fiber portion 3 is formed of an appropriate fiber that can ensure impregnation with an impregnating agent that has excellent impregnation properties and has a required strength, such as a one-way fiber sheet or a two-way fiber sheet. Composed. Examples of the material of the reinforcing fiber portion 3 can be, for example, carbon fiber, aramid fiber, glass fiber, PBO fiber, or ultrahigh strength polyethylene fiber. The reinforcing fiber portion 3 in the example of FIG. 2 is a unidirectional fiber sheet made of carbon fiber or the like.

The basis weight of the reinforcing fiber portion 3 is appropriate as long as the basis weight can ensure the impregnation of the impregnating agent having excellent impregnation properties. For example, the carbon fiber for ensuring the impregnation property when a normal impregnating adhesive is used. The maximum weight per unit area can be over 600 g / m ² . Furthermore, it is also possible to use spread fibers for the reinforcing fiber part 3 so that more uniform impregnation can be performed in a short time.

  As shown in FIGS. 1 and 2, the reinforcing fiber portion 3 is partially bonded to the separator 2 at a part on the separator 2 side, and is fixed to one side of the separator 2 by a partial adhesive layer 5. The partial adhesive layer 5 of this example is formed so as to impregnate the nonwoven fabric 23 on the other side of the separator 2, and the adhesive strength between the separator 2 and the reinforcing fiber portion 3 is enhanced.

The partial adhesive layer 5 is, for example, an epoxy resin-based adhesive or the like, and an appropriate adhesive that can bond the separator 2 and the reinforcing fiber portion 3 with a required adhesive strength is used. If the basis weight of the partial adhesive layer 5 is less than 10% of the basis weight of the reinforcing fiber part 3, there is a risk of peeling during material handling. If it exceeds 350%, the reinforcing fiber part 3 is entirely impregnated with the partial adhesive layer 5 Therefore, the content is preferably 10% to 350%, and more preferably 25% to 250%. For example, when the basis weight of the reinforcing fiber part 3 is 200 g / m ² of carbon fiber, if it is less than 20 g / m ² , there is a risk of peeling during material handling, and if it exceeds 700 g / m ² , the reinforcing fiber part 3 is partially bonded. since the result in the whole impregnation with a layer ^5, it is preferably set to ^{20g / m 2 ~700g / m 2} , more preferably or equal to 50 to 500 g / ^{m 2.}

  As shown in FIG. 1, the impregnated layer 4 is formed so as to impregnate the reinforcing fiber portion 3, and the impregnating agent is, for example, an epoxy resin-based or acrylic resin-based impregnating agent, and high strength due to impregnation is obtained. As described above, those having properties such as curing speed and viscosity excellent in impregnation properties are used. The impregnated layer 4 formed of synthetic resin and the reinforcing fiber portion 3 impregnated with the impregnated layer 4 are integrated to form a fiber reinforced plastic.

  The material of the impregnation layer 4 and the adhesive layer 1 may be different. For example, the adhesive of the adhesive layer 1 may be an acrylic resin type, and the impregnating agent of the impregnation layer 4 may be an epoxy resin type. Moreover, if the viscosity of the impregnating agent that becomes the impregnated layer 4 is less than 10 mPa · s, the reinforcing fiber may be impregnated and cured before being cured, and if it exceeds 100,000 mPa · s, the reinforcing fiber is impregnated. Since the agent may not be impregnated, it is preferably 10 mPa · s to 100,000 mPa · s, and more preferably 100 to 50,000 mPa · s.

  Next, the reinforcement construction method which constructs the reinforcement structure of the concrete structure of 1st Embodiment is demonstrated. First, as shown in FIG. 3A, an adhesive 1 a having a property excellent in adhesiveness is applied to the surface 10 a of the concrete structure 10.

  Then, a substantially planar reinforcing fiber portion 3 is provided by laminating a part of the separator 2 side with a partial adhesive layer 5 on one side of the separator 2 where the adhesive 1a and the impregnating agent cannot penetrate. As shown in FIG. 3 (b), the surface of the separator 2 on the side where the reinforcing fiber portion 3 of the reinforcing sheet is not laminated is used as an adhesive before the adhesive 1a is cured. By attaching to 1a, in this example, the separator 2 is adhered with an adhesive 1a so as to impregnate the non-woven fabric 22, and a reinforcing sheet is attached. When the adhesive 1 a is cured to become the adhesive layer 1, the separator 2 is bonded with the adhesive layer 1.

  Thereafter, as shown in FIG. 3 (c), the reinforcing fiber portion 3 of the reinforcing sheet is impregnated with the reinforcing fiber portion 3 by applying an impregnating agent having excellent impregnation property with a roller or the like, and the reinforcing fiber portion 3 is impregnated. The impregnated layer 4 is formed. At this time, since the separation film 21 of the separator 2 does not permeate the impregnating agent, the adhesive layer 1 and the impregnating layer 4 are formed in a separated state.

  According to the reinforcing structure or the reinforcing method of the concrete structure of the first embodiment, it is possible to form the reinforcing fiber part 3 and the impregnated layer 4 in a high strength impregnated state with an impregnating agent having a very excellent impregnation property. At the same time, the adhesive layer 1 can be formed with an adhesive having a very excellent adhesive property, and the separator 2 can be adhered to the surface 10a of the concrete structure 10 with high adhesive strength. Therefore, it is possible to maximize the excellent properties in both the strength by the impregnation and the adhesive strength. Furthermore, since it is possible to use an impregnating agent excellent in impregnation property for impregnation of the reinforcing fiber portion 3, the reinforcing fiber portion 3 can be formed with a larger amount of fibers, and the strength of the reinforcing fiber portion 3 itself is also increased. Can be increased.

  Furthermore, by separating the adhesive and impregnating agent so that they cannot permeate, it is possible to obtain a fast and stable adhesive state as required using an adhesive with a fast curing speed, and to improve workability with an adhesive that is difficult to sag. In addition, it is possible to make it difficult to cause shear adhesion peeling on the adhesive surface by a required adhesive, and it is also possible to easily derive the tensile strength inherent to the reinforcing fiber by the required impregnating agent. For example, even if the work time such as reinforcement of a railway tunnel is limited and a force such as a large wind pressure is received immediately after the work is finished, the adhesive layer 1 is formed with an adhesive having a high curing speed, and the reinforcing sheet is bonded quickly and stably. It becomes possible, and it becomes possible to easily cope with flexible work.

  Further, by partially bonding a part of the reinforcing fiber part 3 on the separator 2 side to the separator 2, the reinforcing fiber part 3 can be stably fixed to the separator 2 and the reinforcing fiber part 3 is required by partial adhesion. Can be ensured. Further, the non-woven fabric 22 on the surface of the separation film 21 on the concrete structure 10 side can increase the adhesive strength between the separator 2 and the adhesive layer 1, and the non-woven fabric 23 on the surface of the separation film 21 on the reinforcing fiber portion 3 side. The adhesive strength between the separator 2 and the reinforcing fiber portion 3 can be increased.

[Reinforcement structure and reinforcement method for concrete structure of second embodiment]
As in the first embodiment, the reinforcing structure of the concrete structure according to the second embodiment of the present invention is, as shown in FIG. 4, an adhesive layer 1 adhered to the surface 10a of the concrete structure 10 such as a tunnel, and an adhesive layer. A separator 2 bonded to 1, a substantially planar reinforcing fiber portion 3 provided on a surface opposite to the adhesive layer 1 of the separator 2, and an impregnation layer 4 impregnated with the reinforcing fiber portion 3. 2 separates the adhesive layer 1 side and the impregnated layer 4 side so that they cannot penetrate.

The separation film 21, the nonwoven fabrics 22, 23, and the impregnation layer 4 corresponding to the adhesive layer 1, the separator 2, and the separation layer constituting the separator 2 in the second embodiment are basically the same as those in the first embodiment (see FIG. 4, see FIG. If the basis weight of the nonwoven fabric 23 such as polyester fiber is less than 10 g / m ² , it is difficult to reliably obtain the required fixing strength to the impregnation layer 4, and if it exceeds 100 g / m ² , the impregnation agent that becomes the impregnation layer 4 the allowed to remain by sufficiently impregnated into the nonwoven fabric, since the be bonded by suppressing a gap that causes peeling or breakage becomes difficult, preferably to ^{10g / m 2 ~100g / m 2} , more preferably It is good to set it as 10-50 g / m < ² >.

  The substantially planar reinforcing fiber portion 3 is formed of an appropriate fiber that can ensure impregnation with an impregnating agent having excellent impregnation properties and has a required strength. Examples of materials include carbon fibers, aramid fibers, It is possible to use glass fiber, PBO fiber, ultrahigh strength polyethylene fiber, or the like. And the reinforcing fiber part 3 in 2nd Embodiment is provided so that it may sew on the separator 2, as shown in FIGS.

  The reinforcing fiber portion 3 in the illustrated example is sewn with a sewing thread 6 that passes through the separation film 21 of the separator 2 and is passed through the nonwoven fabric 22 on the adhesive layer 1 side. That is, the upper thread 61 that is passed through the nonwoven fabric 22 along the surface of the nonwoven fabric 22 on the side of the adhesive layer 1 and both ends are arranged in the separation film 21 and the lower side of the fiber of the reinforcing fiber portion 3 so as to support the lower side The both ends of the upper thread 61 are sewn with the lower thread 62 disposed in the separation film 21, and the both ends of the upper thread 61 and the both ends of the lower thread 62 are connected to each other. The reinforcing fiber portion 3 is fixed in the thickness direction and the width direction with the sewing thread 6. Furthermore, as shown in FIG. 6, the sewing thread 6 is sewn in the direction orthogonal to the fibers arranged in one direction.

  The reinforcing fiber portion 3 in the second embodiment can be appropriately configured with a unidirectional fiber sheet or a fabric of a bi-directional fiber sheet as in the first embodiment, but as shown in FIG. It is preferable to be composed of 31 m or filament 31 n.

  The toe 31m is obtained by solidifying the filament 311m to a certain thickness with the bundling material 312m. For example, the tows 31m such as carbon fibers are aligned and arranged in one direction, and these tows 31m are sewn with the sewing thread 6. As a result, it is laminated on the separator 2 (see FIG. 7A). Further, the filament 31n is, for example, a certain amount of filaments 31n such as carbon fibers arranged in one direction, further arranged in one direction, and the filaments 31n are sewn with the sewing thread 6. To laminate the separator 2 (see FIG. 7B).

The basis weight of the reinforcing fiber portion 3 such as the tow 31m or the filament 31n is also appropriate as long as the basis weight can ensure the impregnation of the impregnating agent having excellent impregnation property. For example, the impregnation property when using a normal impregnating adhesive is ensured. The maximum weight per unit area of the carbon fiber to be made can be over 600 g / m ² . Furthermore, it is also possible to use spread fibers for the reinforcing fiber part 3 so that more uniform impregnation can be performed in a short time.

  Next, the reinforcement construction method which constructs the reinforcement structure of the concrete structure of 2nd Embodiment is demonstrated. First, as shown in FIG. 8A, an adhesive 1 a having a property excellent in adhesiveness is applied to the surface 10 a of the concrete structure 10.

  Then, using the reinforcing sheet having the above-described configuration in which the substantially planar reinforcing fiber portion 3 is sewn and laminated on one side of the separator 2 through which the adhesive 1a and the impregnating agent cannot penetrate, FIG. As shown, the separator 2 is impregnated with the nonwoven fabric 22 in this example by attaching the surface of the separator 2 on the side where the reinforcing fiber portion 3 of the reinforcing sheet is not laminated to the adhesive 1a before the adhesive 1a is cured. The reinforcing sheet is adhered by adhering and adhering with the adhesive 1a. When the adhesive 1 a is cured to become the adhesive layer 1, the separator 2 is bonded with the adhesive layer 1.

  Thereafter, as shown in FIG. 8 (c), the reinforcing fiber portion 3 of the reinforcing sheet is impregnated with the reinforcing fiber portion 3 by applying an impregnating agent having excellent impregnation property with a roller or the like, and the reinforcing fiber portion 3 is impregnated. The impregnated layer 4 is formed. At this time, since the separation film 21 of the separator 2 does not permeate the impregnating agent, the adhesive layer 1 and the impregnating layer 4 are formed in a separated state.

  According to the reinforcing structure or the reinforcing method of the concrete structure according to the second embodiment, a corresponding effect is obtained by the configuration corresponding to the first embodiment, and the reinforcing fiber portion 3 is sewn to the separator 2, thereby reinforcing fiber. The reinforcing fiber part 3 and the separator 2 can be made more flexible and very flexible than the configuration in which the part 3 is partially bonded to the separator 2. Therefore, the reinforcing fiber part 3, the separator 2, or the reinforcing sheet can be bent and bent into various shapes, and can be reliably installed so as to be adapted to the uneven portion and the bent portion of the structure.

  In addition, the reinforcing fiber portion 5 can be sewn with high strength and stability by using the nonwoven fabric 22 on the surface of the separation film 21 on the side of the concrete structure 10 while increasing the adhesive strength with the adhesive layer 1. . Further, when the reinforcing fiber part 5 is impregnated with the non-woven fabric 23 on the surface of the separation fiber 21 on the reinforcing fiber part 5 side, the impregnating agent is adsorbed on the non-woven fabric 23 on the surface of the reinforcing fiber part 5 to reinforce the reinforcing fiber. The impregnating agent can be reliably retained in the portion 5 and the separator 2, and the generation of voids can be reliably prevented.

  Further, when the reinforcing fiber portion 5 is composed of the tow 31m or the filament 31n, a desired amount of the tow 31m or 31n filament is sewn without using a fabric such as a woven fabric, a knitted fabric, or a non-woven fabric in which the reinforcing fiber amount is determined in advance. It becomes possible to form the reinforcing fiber portion 5 and to adjust the amount of the reinforcing fiber freely so that the reinforcing fiber portion 5 having the required strength can be obtained flexibly.

  Furthermore, when the reinforcing fiber portion 5 is composed of the tows 31m, it is possible to arrange and process the tows 31m having a certain thickness and a unit, so that the efficiency of processing and construction can be improved. Further, when the reinforcing fiber portion 5 is composed of the filament 31n, it is possible to form the impregnated layer 4 by impregnating the impregnating agent up to a region corresponding to the bundling material 312m of the tow 31m, and the periphery of each filament 31n. In addition, the reinforcing effect can be enhanced by impregnating with the impregnating agent more reliably, and the reinforcing strength compared with the same amount of reinforcing fibers can be increased as compared with the tow 31m or the fabric.

[Modifications of Embodiment, etc.]
In addition to each invention and each embodiment, the invention disclosed in this specification is specified by changing these partial configurations to other configurations disclosed in this specification within the applicable range, or these It includes those specified by adding other configurations disclosed in this specification to the configuration, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as a superordinate concept. The following modifications are also included.

  For example, the separator in the present invention is not limited to the separator 2 in which the nonwoven fabrics 22 and 23 are fixed to both surfaces of the separation film 21 which cannot penetrate the adhesive and the impregnating agent, but can separate the adhesive layer side and the impregnating layer side so as not to penetrate. As long as it is appropriate, for example, a separator in which a nonwoven fabric is disposed on either the adhesive layer 1 side or the reinforcing fiber portion 3 side with respect to a separation layer such as a separation film may be used. Thereby, when the reinforcing fiber part 5 is partially bonded to the separator 2, the adhesive strength to the adhesive layer 1 or the reinforcing fiber part 3 can be increased, and when the reinforcing fiber part 5 is sewn to the separator 2. The reinforcing fiber part 5 can be sewn with high strength and stability while increasing the adhesive strength with the adhesive layer 1, or the impregnating agent is adsorbed to the nonwoven fabric 23 on the surface on the reinforcing fiber part 5 side. Thus, the impregnating agent can be reliably retained in the reinforcing fiber portion 5 and the separator 2 to reliably prevent the generation of voids.

  Furthermore, in the separator in which the nonwoven fabric is arranged on either side, for example, a laminate adhesive is applied to the reinforcing fiber portion 3 to adhere the nonwoven fabric, and the adhesive layer formed by the laminate adhesive is used as a separation layer. When the resin is cured in a state in which the part is impregnated and the cured resin is configured as a separation layer, the separation layer and the nonwoven fabric can be firmly fixed, and a laminating adhesive or its adhesive can be separately attached to the separation layer and the nonwoven fabric. Application is unnecessary, which is preferable because it can reduce costs and improve the production efficiency of the separator. The separator in which the nonwoven fabric is disposed on either the adhesive layer 1 side or the reinforcing fiber part 3 side with respect to the separation layer such as the separation film is basically the same construction procedure as in the first and second embodiments. It is possible to construct with.

  In addition to the synthetic resin adhesive, the adhesive forming the adhesive layer 1 is appropriate, for example, a polyester fiber nonwoven fabric, a glass fiber nonwoven fabric, asbestos paper, and a cement component such as calcium carbonate / pulp / glass mixed paper. It is also possible to fix the adhered thin layer to one side of the separation film 21 of the separator 2 and adhere the fixed surface of the thin layer using cement mortar, concrete, or the like as an adhesive.

  Further, when the reinforcing fiber portion 3 is sewn with the sewing thread 6, the way of sewing is appropriate as well as the example of the second embodiment. For example, as shown in FIG. It is possible to have a configuration in which the sewing thread 6m is sewn in two directions.

Regarding the experimental example of the first embodiment, as a separator 2, a polyester nonwoven fabric having a basis weight of 30 g / m ² is laminated and fixed on both sides of a polyester film having a thickness of 38 μm, and partially adhered to one side of the separator 2 laminating epoxy adhesive to form a layer 5 (Konishi bond E2500 Co., Ltd.) 200 g / ^{m 2} was applied, partial adhesive layer as a reinforcing fiber unit 3 by laminating the carbon fiber 200 g / ^{m 2} of unidirectional fiber sheet 5 to form a reinforcing sheet.

Then, a primer is applied to a concrete specimen (100 × 100 × 400 mm) that has been split at the center in advance by three-point bending, and an epoxy putty-like adhesive (Regigard Bond made by Dainippon Paint Co., Ltd.) that becomes the adhesive layer 1 JH) was applied at 500 g / m ^2, and the formed reinforcing sheet was adhered. Thereafter, an epoxy adhesive having a viscosity of 700 mPa · s (Bond E206 manufactured by Konishi Co., Ltd.) as an impregnating agent was applied to and impregnated the carbon fiber of the reinforcing sheet by 300 g / m ² . Three test specimens were formed.

  Then, after the adhesive agent and the impregnating agent were respectively cured to complete the adhesive layer 1 and the impregnating layer 4, a three-point bending test was performed. As a result, the breaking strength was 46.8 kN, 35.5 kN, and 39.8 kN, and the average breaking strength was 40.7 kN, confirming that the reinforcing structure according to the present invention has excellent strength. These fractures were all concrete cohesive fractures, and were not broken at the interface between the reinforcing sheet and the adhesive layer 1.

For comparison, the carbon fiber sheet is bonded to the same concrete specimen with this impregnating adhesive while impregnating the carbon fiber 200 g / m ² of the unidirectional fiber sheet with the impregnating adhesive (Bond E2500 manufactured by Konishi Co., Ltd.). A three-point bending test was performed on the test specimens (test specimens corresponding to the CFRP method). As a result, when the breaking strength was 30.0 kN, 33.5 kN, 31.8 kN, the average breaking strength was 31.8 kN, and all of these breakings were cohesive failure of the impregnated adhesive.

Regarding the experimental example of the second embodiment, as the separator 2, a polyester nonwoven fabric having a basis weight of 30 g / m ² is laminated and fixed on both sides of a polyester film having a thickness of 38 μm, and the reinforcing fiber part 5 is a warp: Carbon fiber, weft: A two-way fiber sheet made of glass fiber and laminated using a fabric weighing 200 g / m ^2. Polyester yarn # 8 is used as a sewing thread 6, and the carbon fiber is spaced every 15 mm with a needle foot spacing of 5 mm. The reinforcing sheet was formed by sewing so as to be orthogonal.

Then, a primer is applied to a concrete specimen (100 × 100 × 400 mm) that has been split at the center in advance by three-point bending, and an epoxy putty-like adhesive (Regigard Bond made by Dainippon Paint Co., Ltd.) that becomes the adhesive layer 1 JH) was applied at 500 g / m ^2, and the formed reinforcing sheet was adhered. Thereafter, epoxy adhesive having a viscosity 700 mPa · s to (Konishi Bond Co., Ltd. E206) carbon fibers reinforced sheet was impregnated with 300 g / ^{m 2} applied to the glass fiber as impregnating agent. Three test specimens were formed.

  Then, after the adhesive agent and the impregnating agent were respectively cured to complete the adhesive layer 1 and the impregnating layer 4, a three-point bending test was performed. As a result, the breaking strength was 42.4 kN, 35.5 kN, and 39.8 kN, and the average breaking strength was 40.2 kN, confirming that the reinforcing structure according to the present invention has excellent strength. These fractures were all concrete cohesive fractures, and were not broken at the interface between the reinforcing sheet and the adhesive layer 1.

  The present invention can be used when reinforcing concrete structures such as tunnels, bridges, piers, elevated roads, buildings, and the like.

DESCRIPTION OF SYMBOLS 1 ... Adhesive layer 1a ... Adhesive 2 ... Separator 21 ... Separation film 22, 23 ... Nonwoven fabric 3 ... Reinforcing fiber part 31m ... Toe 311m, 31n ... Filament 312m ... Converging material 4 ... Impregnation layer 5 ... Partial adhesion layer 6, 6m ... Sewing thread 61 ... Upper thread 62 ... Lower thread 10 ... Concrete structure 10a ... Surface of concrete structure

Claims (11)

An adhesive layer bonded to the surface of the concrete structure;
A separator adhered to the adhesive layer;
A substantially planar reinforcing fiber portion provided by being laminated on the surface opposite to the adhesive layer of the separator;
An impregnation layer for impregnating the reinforcing fiber portion,
The reinforcing structure of a concrete structure, wherein the separator separates the adhesive layer side and the impregnated layer side so as not to penetrate.   The reinforcing structure for a concrete structure according to claim 1, wherein a part of the reinforcing fiber portion on the separator side is partially bonded to the separator.   The reinforcing structure for a concrete structure according to claim 2, wherein the separator has a configuration in which a nonwoven fabric is laminated on both sides of a separation layer.   The reinforcing structure for a concrete structure according to claim 2, wherein the separator is composed of a nonwoven fabric and a separation layer made of a resin cured in a state in which a part of the nonwoven fabric is impregnated.   The reinforcing structure for a concrete structure according to claim 1, wherein the reinforcing fiber portion is sewn to the separator. The separator is a structure in which a nonwoven fabric is laminated on at least the adhesive layer side surface of the separation layer,
The reinforcing structure of a concrete structure according to claim 5, wherein the reinforcing fiber portion is sewn with a sewing thread that passes through the separation layer of the separator and passes through the nonwoven fabric on the adhesive layer side. .   The reinforcing structure for a concrete structure according to claim 6, wherein a nonwoven fabric is also laminated on the surface of the separation layer on the reinforcing fiber portion side.   The reinforcing structure for a concrete structure according to any one of claims 5 to 7, wherein the reinforcing fiber portion is made of tow or filament.   The reinforcing structure for a concrete structure according to claim 3, 4, 6, or 7, wherein the separation layer has a thickness of 12 to 250 µm. Reinforcing structure according to claim 3, 4, 6 or 7 concrete structure according basis weight of each of the nonwoven fabric is characterized in that it is a 10 to 50 g / ^{m 2.} Applying an adhesive to the surface of the concrete structure;
A step of adhering the separator by adhering the separator with the adhesive; and a reinforcing sheet provided with a substantially planar reinforcing fiber portion laminated on one side of the separator through which the adhesive and impregnating agent cannot penetrate;
Applying an impregnating agent to the reinforcing fiber portion of the reinforcing sheet to impregnate the reinforcing fiber portion;
A method for reinforcing a concrete structure, comprising:

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