JP2000073586A - Reinforcing method, frp reinforcing tape and reinforcing adhesive for concrete structural member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the constraining effect of a reinforcing fiber by continuously winding an FRP reinforcing tape around a concrete structural member with overlapping, applying an adhesive to the reinforcing tape, and hardening the adhesive in the state where a prestress is introduced thereto. SOLUTION: The end part 1A of an FRP reinforcing tape 1 is fixed around a concrete column 100 subjected to surface treatment, for example, by use of a reinforcing adhesive, and the reinforcing tape 1 is continuously wound around the concrete column 100 with overlapping in a necessary number of layers while applying the reinforcing adhesive to one side or both sides thereof. When the winding work is ended, the other end part 1B of the FRP reinforcing tape 1 is pulled with a force P to introduce a prestress to the FRP reinforcing tape 1 wound on the concrete column 100. Accordingly, the tensile distortion between the adjacent FRP reinforcing tape 1 can be made constant to prevent the peeling between the FRP reinforcing tapes 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing concrete structural members such as beams and girders, and a reinforcing FRP tape and a reinforcing adhesive used in the reinforcing method.

[0002]

2. Description of the Related Art Conventionally, a method of reinforcing a columnar member such as a pier, a middle pillar of a subway, or a pillar of a building, particularly a structural member such as a concrete pillar constructed of reinforced concrete (RC) or steel reinforced concrete (SRC). Examples include a method of rolling up reinforced concrete around a concrete column and a method of attaching a steel plate.

[0003] The method of rolling up reinforced concrete (RC) involves increasing the weight, newly increasing the cross-sectional area,
There are problems such as a long curing period and a long construction period because concrete is cast on site. The method of attaching the steel plates requires welding the steel plates to each other or joining them by bolting, and has the problems that the steel plates are heavy and workability is poor.

Therefore, in recent years, a reinforcing method of winding a carbon fiber sheet around a concrete column has been proposed.

That is, as shown in FIG. 7, a width (W _O ) of 20 to 50 c is formed by arranging carbon fibers f in one direction.
m continuous carbon fiber sheet 10 is wound around the concrete column 100 by a predetermined number of turns, or a width (W _O ) shorter than the circumference of the concrete column 100.
A plurality of reinforcing fiber sheets 10 cut to a size of 20 to 50 cm and a length of 1 to 2.5 m are used, and a predetermined number of the reinforcing fiber sheets 10 It is performed by laminating and winding into a layer, impregnating the reinforcing fiber sheet 10 with a resin, and curing the resin.

[0006]

However, according to the reinforcing method using the above-mentioned conventional reinforcing fiber sheet 10,
The reinforcing fiber sheet 10 is merely wound around the outer periphery of the concrete column, and the reinforcing effect of the reinforcing fiber sheet 10 is exhibited after the concrete column starts to be broken such as cracks due to compressive force or the like. Yes,
There is a demand for a further improvement in the reinforcing effect without leading to the prevention of cracks.

Further, according to the conventional method, for example, FIG.
As shown in FIG. 1, when reinforcing a concrete structural member such as the beam 100 with the slab 101, the slab 1
01, the carbon fiber sheet 10 is continuously wound around the beam 100 and reinforced around the concrete column 100, and after the winding, the slab 101 is restored. Such a reinforcing method is complicated and has a problem that the construction period is long.

In order to reinforce the beam 100, the carbon fiber sheet 10 is not wound around the beam 100 as shown in FIGS.
0 is wound in a U-shape, and both ends of the carbon fiber sheet 10 are fixed to the columns 100 by means of anchor bolts 102 and L-shaped angles 103. This method does not require the trouble of breaking and restoring the slab 101, but requires processing of an L-shaped angle, and has a problem that the work of fixing the anchor bolts 102 is complicated, and the construction is troublesome. At the same time, the carbon fiber sheet 10 cannot be wound around the beam in a closed shape, and there is a problem in terms of the reinforcing effect.

Accordingly, an object of the present invention is to improve the restraining effect of reinforcing fibers on concrete structural members such as beams with slabs, girders, or columns with sleeve walls, and to improve the strength and toughness of concrete structural members. Can be planned,
An object of the present invention is to provide a method for reinforcing a concrete structural member capable of sufficiently achieving an intended reinforcing effect even before the concrete structural member breaks.

Another object of the present invention is to provide an FRP reinforcing tape and a reinforcing adhesive which can be used in the above-mentioned method for reinforcing a concrete structural member, can be easily constructed, and can shorten the construction period. .

[0011]

The above object is achieved by a method for reinforcing a concrete structural member according to the present invention. In summary, according to the first aspect of the present invention, the FRP reinforcing tape is continuously superposed and wound around the outer periphery of the concrete structural member, and the FRP reinforcing tape is coated with an adhesive. A method for reinforcing a concrete structural member is provided, wherein a prestress is introduced and the adhesive is cured in the prestressed state.

According to a second aspect of the present invention, there is provided (a) a step of fixing one end of an FRP reinforcing tape to the outer periphery of a concrete structural member, and (b) the step of applying an adhesive to the FRP reinforcing tape. A step of continuously overlapping and winding the FRP reinforcing tape around the outer periphery of the concrete structural member,
(C) after winding the required number of layers, pulling the other end of the FRP reinforcing tape to introduce a prestress to the FRP reinforcing tape, and (d) curing the adhesive while the prestress is applied. And a method for reinforcing a concrete structural member.

According to a third aspect of the present invention, there is provided a method for reinforcing a concrete structural member in which a slab or a wall portion is integrally formed, wherein (a) a through hole is formed in a wall portion connected to the concrete structural member. (B) fixing one end of an FRP reinforcing tape to the outer periphery of the concrete structural member, and (c) applying an adhesive to the FRP reinforcing tape while using the through holes. A step of continuously overlapping and winding the FRP reinforcing tape around the outer periphery of the concrete structural member; and (d) after winding the required number of layers, pulling the other end of the FRP reinforcing tape, and
A step of introducing prestress into the RP reinforcing tape, (e)
Curing the adhesive under the prestressed condition.

In the present invention, preferably, the FRP
Prior to winding the reinforcing tape, a primer is applied to the outer peripheral surface of the concrete structural member as necessary.

According to one embodiment of the present invention, the FRP
The reinforcing tape is (a) having a thickness of 0.05 to 5 mm and a width of 5 mm.
-200 mm, (b) the reinforcing fiber has an elastic deformation range of 0.3% or more when pulled, (c) the volume content of the reinforcing fiber is 10% (volume) or more and 70% (volume) or less, It is.

According to an embodiment of the present invention, the reinforcing adhesive has a pot life of at least 10 minutes at 20 ° C. and a curing time of 30 hours at 20 ° C., as measured by a temperature rise method. Hereinafter, the viscosity at 20 ° C. is 50 cps or more and 10,000
0 cps or less.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for reinforcing a concrete structural member according to the present invention, and an FRP reinforcing tape and a reinforcing adhesive used in the reinforcing method will be described in more detail with reference to the drawings.

Embodiment 1 With reference to FIG. 1 and FIG. 2, a case where the reinforcing method of the present invention is applied to a concrete structural member having a circular cross section, that is, a concrete column 100 will be described.

According to the present invention, the outer peripheral surface of the concrete column 100 is preferably subjected to a surface treatment such as application of a primer or the like to a portion where the FRP reinforcing tape is wound,
A continuous FRP reinforcing tape 1 is wound around the outer periphery of the concrete pillar 100. At this time, a reinforcing adhesive is applied to one side or both sides of the FRP reinforcing tape 1.

Next, a prestress is introduced into the FRP reinforcing tape while the FRP reinforcing tape wound around the concrete pillar 100 is in a tensioned state, and the reinforcing adhesive applied to the FRP reinforcing tape 1 is cured in the prestressed state.

More specifically, in FIG. 1, the FR around the outer periphery of the surface-treated concrete pillar 100 is shown.
One end 1A of the P reinforcing tape 1 is fixed with, for example, a reinforcing adhesive. When one end 1A of the FRP reinforcing tape 1 is fixed to the concrete column 100, the FRP reinforcing tape 1
FRP reinforcing tape 1 is continuously wound around the outer periphery of concrete column 100 and a required number of layers are wound by lap winding while a reinforcing adhesive is applied to one or both sides of the FRP reinforcing tape.

FRP for this concrete column 100
When the operation of winding the reinforcing tape 1 is completed, the other end 1B of the FRP reinforcing tape 1 is pulled with a force P, and prestress is introduced into the FRP reinforcing tape 1 wound around the concrete column 100.

According to the present invention, the uncured reinforcing adhesive applied to the wound FRP reinforcing tape 1 is applied to the FRP reinforcing tape 1 to introduce prestress.
When a tensile force is applied to the FRP reinforcing tape 1, it functions as a lubricant between the reinforcing tapes laminated so that the stress spreads over the entire FRP reinforcing tape 1. Therefore, according to the present invention, the FRP reinforcing tape 1 having a plurality of layers overlapped has the same tensile strain between adjacent FRP reinforcing tapes 1 except for the fixed end portion 1A, thereby preventing separation between the FRP reinforcing tapes. it can.

As described above, in the present invention, before the reinforcing adhesive applied at the time of winding the FRP reinforcing tape is cured,
Since the tensile force is applied to the RP reinforcing tape 1, after the reinforcing adhesive is hardened, the FRs having a plurality of layers overlapped.
A uniform tensile prestress is introduced into the P reinforcing tape 1.

As will be understood from the above description, a quick-curing adhesive is used as the adhesive at the time of initial bonding for bonding the end 1A of the reinforcing tape 1 to the surface of the concrete structural member 100. Preferably, the tape end 1A can be fixed to the surface of the concrete structural member at an early stage. On the other hand, as the adhesive applied when the tape is wound around the surface of the concrete structural member, it is preferable to use an adhesive having a long pot life.

Referring to FIGS. 3A and 3B, an embodiment of the FRP reinforcing tape 1 is shown. FRP
The reinforcing tape 1 is produced by aligning continuous reinforcing fibers f in one direction, impregnating the matrix resin 3 into the reinforcing fibers, and curing. For example, it can be manufactured by drawing or the like.

The FRP reinforcing tape 1 has an overall thickness (T)
Is 0.05 to 5 mm, the width (W) is 5 to 200 mm, and the reinforcing fiber f has an elastic deformation area of 0.3% when pulled.
That is all.

That is, the thickness (T) of the FRP reinforcing tape 1
Is smaller than 0.05 mm, a large number of laminations are required to secure the required number of laminations, and it is very difficult to manufacture the tape itself. On the other hand, when the thickness (T) of the FRP reinforcing tape 1 exceeds 5 mm, the FRP reinforcing tape itself becomes strong, and it becomes difficult to introduce prestress.

If the elastic deformation range is less than 0.3%, a breaking trouble due to excessive pulling occurs when a pulling force is applied, and the maximum strain at the time of the introduction of prestress is limited to a low level. (Creep) progresses quickly.

As the reinforcing fibers f, carbon fibers are preferable, and PAN-based fibers, pitch-based fibers, and the like can be used. The reinforcing fiber f is not limited to the carbon fiber alone, and may also be a glass fiber; a metal fiber such as boron, titanium, and steel; and an organic fiber such as aramid, polyester, and nylon.
If necessary, a plurality of such fibers may be mixed and used as a hybrid type.

Regarding the physical properties of the reinforcing fiber f, the elastic modulus is preferably not less than 0.3 × 10 ⁶ kgf / cm ² and 5.0.
× 10 ⁶ kgf / cm ² or less. Elastic modulus 0.3
When it is less than × 10 ⁶ kgf / cm ² , the restraining effect is weakened, and when it exceeds 5.0 × 10 ⁶ kgf / cm ² , relaxation tends to occur.

As the matrix resin 3, a thermosetting resin such as a room-temperature-curable or thermosetting epoxy resin, a polyester-based resin, or a radical-reactive resin such as MMA can be used.

At this time, the reinforcing fiber volume content of the FRP reinforcing tape 1, that is, (volume of reinforcing fiber f) / (volume of reinforcing fiber f + volume of impregnated resin 3) × 100 (%)
Is not less than 10% (volume) and not more than 70% (volume). When the reinforcing fiber content is less than 10% (volume), the thickness (T) of the FRP reinforcing tape 1 for securing the required fiber amount
In particular, concrete pillars having a rectangular cross section rebound at corners during winding, making construction difficult. If the reinforcing fiber content exceeds 70% (volume), the strength expression rate of the reinforcing fibers f as the FRP reinforcing tape 1 decreases, and the reinforcing efficiency deteriorates.

According to the present invention, the FRP reinforcing tape 1 wound around the concrete column 100 cures the reinforcing adhesive applied in a state where the prestress has been introduced. After curing, the unnecessary terminal portion 1B of the FRP reinforcing tape 1 is cut.

As in the case of the matrix resin 3, the reinforcing adhesive used in the present invention is a thermosetting resin such as a cold-setting or thermosetting epoxy resin or a polyester resin.
Further, a resin containing a radical reaction resin such as MMA can be used.

As the reinforcing adhesive, an adhesive having a sufficiently long pot life can be used, and can be applied and wound, and can maintain a sufficiently low viscosity for a long time until a tensile force is introduced.

That is, as for the reinforcing adhesive, the pot life at 20 ° C. is 10 minutes or more, preferably 60 minutes or more, and the coating curing time at 20 ° C. is 30 hours or less, as measured by a temperature rise method. Is 25 hours or less and the viscosity at 20 ° C. is 5
0 cps or more and 100000 cps or less, preferably 1
0000 cps or less.

In particular, when the viscosity at 20 ° C. is less than 50 cps, there is a problem that it is difficult to apply a sufficient amount of resin to the FRP reinforcing tape 1 and the adhesion strength between layers is reduced. In addition, there is a problem that it takes a long time to apply the material to the FRP reinforcing tape, and the thickness of the applied material becomes non-uniform, which causes poor adhesion.

The surface on which the reinforcing fibers f such as carbon fibers are wound can be finished by applying a finishing mortar or spraying a paint or the like.

As described above, according to the reinforcing method of the present invention, prestress is introduced after the FRP reinforcing tape 1 is wound around the concrete column 100, so that the workability is good. Further, according to the present invention, since the prestress is given to the concrete column 100 by the continuous fiber, a further restraining effect can be obtained, and as a result, especially the improvement of the shear strength and the great improvement of the toughness ability can be obtained. Significant improvement can be expected.

Embodiment 2 A case where the reinforcing method of the present invention is applied to a concrete structural member 100 which is a beam having a slab 101 will be described with reference to FIGS.

According to this embodiment, first, a through-hole 104 is formed in the slab 101 located at the reinforcing portion, avoiding the reinforcing reinforcing bar of the slab 101. It is preferable that the hole 104 is formed in close contact with the beam 100 side. Also, this hole 104
Is formed in the present embodiment in a rectangular shape, but may be formed in other shapes.

In the case of a beam having a rectangular cross section as in this embodiment, the corner around the beam is rounded at the corner where the FRP reinforcing tape 1 is wound so as to eliminate the corner. Should be applied.

Next, as described in the first embodiment, a primer is applied to the outer peripheral surface of the beam 100 where necessary, where the FRP reinforcing tape is wound. One end 1A of the FRP reinforcing tape 1 around the outer periphery of the surface-treated beam 100
Are fixed by, for example, a reinforcing adhesive. Tape end 1
In order to eliminate a step between A and the outer peripheral surface of the beam 100, it is preferable to perform putty processing 105 adjacent to the tape end 1A.

One end 1A of the FRP reinforcing tape 1 is
0, the reinforcing adhesive is applied to one or both sides of the FRP reinforcing tape 1 while the FRP is
The required number of layers of the RP reinforcing tape 1 are wound continuously and overlapped.

The FRP reinforcing tape 1 for the beam 100
Is completed, the other end 1B of the FRP reinforcing tape 1 is pulled by the force P to introduce prestress into the FRP reinforcing tape 1 wound around the beam 100. The adhesive is cured in this state.

Also in this embodiment, before the reinforcing adhesive applied at the time of winding the FRP reinforcing tape is hardened,
Since the pulling force is applied to the reinforcing tape 1,
After the reinforcing adhesive has hardened, a uniform tensile pre-stress is introduced into the FRP reinforcing tape 1 which has a plurality of layers,
The tensile strain between adjacent FRP reinforcing tapes 1 becomes the same, and separation between the FRP reinforcing tapes can be prevented.

Third Embodiment FIG. 6 shows a case where the reinforcing method of the present invention is applied to a concrete structural member 100 which is a column having a sleeve wall 101.

Also in this embodiment, first, a through hole 104 is formed in the sleeve wall 101 located at the reinforcing portion, and a reinforcing tape is wound using the through hole 104 to perform the reinforcing work.

The procedure of the reinforcing work is the same as in the first and second embodiments described above, and further description will be omitted.
In this embodiment, the same operation and effect as those of the first and second embodiments can be achieved.

[0051]

As described above, in the method for reinforcing a concrete structural member according to the present invention, an FRP reinforcing tape is continuously wound around the outer periphery of the concrete structural member and wound, and an adhesive is applied to the reinforcing fiber tape. In this state, prestress is introduced into the FRP reinforcing tape, and the adhesive is cured in the prestressed state, so that it is particularly reinforced for concrete structural members such as beams with slabs, girders, or columns with sleeve walls. The effect of restraining the fibers can be improved, the strength and toughness of the concrete structural member can be improved, and the desired reinforcing effect can be sufficiently achieved before the concrete structural member breaks.

Further, according to the present invention, the reinforcing method includes:
(A) a thickness of 0.05 to 5 mm, a width of 5 to 200 mm,
(B) The reinforcing fibers have an elastic deformation range of 0.0 when stretched.
3% or more, (c) the volume content of the reinforcing fiber is 10%
Using a FRP reinforcing tape of not less than (volume) and not more than 70% (volume), and measured by a temperature rise method, 20 ° C.
Pot life at 30 ° C or more, coating time at 20 ° C for 30 hours or less, viscosity at 20 ° C at 50 cps or more,
Since the reinforcing adhesive of 100000 cps or less is used, the construction can be easily performed, and the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an embodiment of a method for reinforcing a concrete structural member according to the present invention.

FIG. 2 is a plan view illustrating a method for reinforcing a concrete structural member according to the present invention shown in FIG.

FIG. 3A is a sectional view of an FRP reinforcing tape, and FIG. 3B is a perspective view of the FRP reinforcing tape.

FIG. 4 is a perspective view illustrating another embodiment of a method for reinforcing a concrete structural member according to the present invention.

5 is a cross-sectional view illustrating a method for reinforcing a concrete structural member according to the present invention shown in FIG.

FIG. 6 is a perspective view illustrating another embodiment of a method for reinforcing a concrete structural member according to the present invention.

FIG. 7 is a perspective view illustrating a conventional reinforcing method by winding a carbon fiber sheet.

FIG. 8 is a perspective view illustrating a conventional method for reinforcing a concrete structural member.

FIG. 9 is a plan view illustrating a method of reinforcing the conventional concrete structural member shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 FRP reinforcement tape 3 Matrix resin 100 Concrete structural member f Reinforcing fiber

Claims (19)

[Claims] An FRP is provided around an outer periphery of a concrete structural member.
The reinforcing tape is continuously stacked and wound, a prestress is introduced into the FRP reinforcing tape in a state where the adhesive is applied to the FRP reinforcing tape, and the adhesive is cured in the prestressed state. A method for reinforcing concrete structural members. 2. A step of fixing one end of an FRP reinforcing tape to the outer periphery of a concrete structural member. (B) The FRP is applied to the outer periphery of the concrete structural member while applying an adhesive to the FRP reinforcing tape. (C) after winding the required number of layers, pulling the other end of the FRP reinforcing tape and pulling the FR
A method for reinforcing a concrete structural member, comprising: a step of introducing a prestress into a P reinforcing tape; and (d) a step of curing the adhesive while the prestress is applied. 3. A method for reinforcing a concrete structural member in which a slab or a wall portion is integrally formed, wherein (a)
Forming a through hole in a wall portion connected to the concrete structural member, (b) fixing one end of an FRP reinforcing tape to an outer periphery of the concrete structural member, (c).
A step of continuously overlapping and winding the FRP reinforcing tape around the outer periphery of the concrete structural member using the through hole while applying an adhesive to the FRP reinforcing tape;
(D) a step of pulling the other end of the FRP reinforcing tape after applying the required number of layers and applying a prestress to the FRP reinforcing tape, and (e) curing the adhesive while the prestress is applied. A method for reinforcing a concrete structural member, comprising: 4. The FRP reinforcing tape according to claim 1, wherein a plurality of continuous reinforcing fibers are arranged in one direction, and the reinforcing fibers are impregnated with a resin and cured. 3. The method for reinforcing a concrete structural member according to item 1. 5. The FRP reinforcing tape has a thickness of 0.0
The method for reinforcing a concrete structural member according to claim 4, wherein the width is 5 to 5 mm and the width is 5 to 200 mm. 6. The method for reinforcing a concrete structural member according to claim 5, wherein said reinforcing fiber has an elastic deformation range at the time of tension of 0.3% or more. 7. The method for reinforcing a concrete structural member according to claim 6, wherein the volume content of reinforcing fibers of the FRP reinforcing tape is not less than 10% (volume) and not more than 70% (volume). 8. The reinforcing fiber has an elastic modulus of 0.3 × 10.
⁶ kgf / cm ² or more, 5.0 × 10 ⁶ kgf / cm ²
The method for reinforcing a concrete structural member according to claim 6 or 7, wherein 9. The reinforcing fiber is any fiber selected from carbon fiber; glass fiber; metal fiber such as boron, titanium, and steel; organic fiber such as aramid, polyester, and nylon; 5. A hybrid type wherein a plurality of types of said fibers are mixed.
9. The method for reinforcing a concrete structural member according to any one of Items 8 to 8. 10. The adhesive has a pot life at 20 ° C. of 10 minutes or more, a coating time at 20 ° C. of 30 hours or less, and a viscosity at 20 ° C. of 50 c, as measured by a temperature rise method.
The method for reinforcing a concrete structural member according to any one of claims 1 to 9, wherein the strength is not less than ps and not more than 100,000 cps. 11. The adhesive has a pot life at 20 ° C. of 60 minutes or more, and a coating time at 20 ° C. of 25 hours or less.
Viscosity at 20 ° C is 100 cps or more, 10,000 c
The method for reinforcing a concrete structural member according to claim 10, wherein the strength is not more than ps. 12. The concrete structure according to claim 10, wherein the resin constituting the adhesive contains at least a room temperature curing type epoxy resin, a thermosetting type epoxy resin or a polyester resin; or a radical reaction type resin such as MMA. How to reinforce members. 13. An FRP used by winding a plurality of continuous reinforcing fibers in one direction, impregnating the reinforcing fibers with a resin, and curing the concrete structural member.
(A) a thickness of 0.05 to 5 mm,
A width of 5 to 200 mm, (b) the reinforcing fiber has an elastic deformation range of 0.3% or more when pulled, and (c) a volume content of the reinforcing fiber of 10% (volume) or more and 70% (vol 2. An FRP reinforcing tape, characterized by the following. 14. The reinforcing fiber has an elastic modulus of 0.3 × 1.
0 ⁶ kgf / cm ² or ^{more, 5.0 × 10 6 kgf / cm} 2
14. The FRP reinforcing tape of claim 13 wherein: 15. The reinforcing fiber is any fiber selected from carbon fiber; glass fiber; metal fiber such as boron, titanium and steel; organic fiber such as aramid, polyester and nylon; 2. A hybrid type in which a plurality of the fibers are mixed.
3 or 14 FRP reinforced tape. 16. The resin according to claim 13, wherein the resin contains at least a room temperature-curable epoxy resin, a thermosetting epoxy resin, or a polyester resin; or a radical reaction resin such as MMA. Reinforcement tape. 17. FR around the outer periphery of the concrete structural member
An adhesive for fixing and reinforcing the reinforcing fiber tape on a concrete structural member by continuously wrapping and winding a P reinforcing tape, and a pot life at 20 ° C. of 10 minutes or more as measured by a temperature rise method. Curing time at 20 ° C, 30 ° C
Time, the viscosity at 20 ° C. is 50 cps or more,
0000 cps or less, the reinforcing adhesive. 18. A pot life at 20 ° C. of 60 minutes or more,
The reinforcing adhesive according to claim 17, wherein the coating film curing time at 0 ° C is within 25 hours and the viscosity at 20 ° C is from 100 cps to 10,000 cps. 19. The reinforcing material according to claim 17, wherein the resin constituting the adhesive contains at least a room temperature curing type epoxy resin, a thermosetting type epoxy resin or a polyester resin; or a radical reaction resin such as MMA. adhesive.