JP2002285461A - Fiber-reinforced sheet and method for reinforcement of structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fiber-reinforced sheet with which especially a tension force can be introduced in a non-impregnated state in a tense bonding method of construction using a fiber-reinforced sheet and which has reliability and can improve workability and to provide a method for concrete structure or steel structure reinforcement. SOLUTION: In this fiber-reinforced sheet 1 in which reinforcing filaments 2 are uniformly arranged and mutually densely placed in one direction, at least one end side in the length direction of the fiber-reinforced sheet has divided end parts 1a, 1b, and 1c divided into a plurality of parts at a fixed distance from the end in the length direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure or a steel structure which is a civil engineering or building structure by a tension bonding method of a reinforcing fiber sheet. Structure ") and a reinforcing fiber sheet used in such a reinforcing method.

[0002]

2. Description of the Related Art In recent years, as a method of reinforcing a structure, an adhesive method has been developed in which a continuous reinforcing fiber sheet is attached to or wound on the surface of an existing or new structure.

[0003] However, the above-mentioned bonding method is only simple bonding, and there is a limit to the improvement of the reinforcing effect of the ultimate proof strength due to the early destruction of the structure due to the separation of the FRP reinforcing material. There is a limit to the suppression effect. In addition, the high performance of FRP reinforcement is often not utilized effectively.

In order to solve such a problem, a tension bonding method using a reinforcing fiber sheet has been proposed. For example, Japanese Patent Application Laid-Open No. 11-182061 discloses that a carbon fiber sheet containing at least carbon fiber as a reinforcing fiber, a cloth and a fiber material formed of a prepreg impregnated with a resin,
Tension is introduced by a tensioning device through a jig, and then
A tension bonding method is disclosed in which a fiber material is attached to the surface of a concrete member with an adhesive, and then a jig and a tension device are removed.

[0005] In particular, in such a tension bonding method, from the viewpoint of workability and the like, when a tension is applied to the reinforcing fiber sheet, the resin impregnation and curing steps of the reinforcing fiber sheet are not performed in advance, that is, no impregnation is performed. It is desirable to be able to introduce tension as it is.

Conventionally, as a method for introducing a tension to a reinforcing fiber sheet, for example, a tension device as shown in FIGS. 5 and 6 attached to the present application is used.

That is, as shown in FIGS. 5 and 6, the tensioning device 10 is attached to a fixed-side attaching means 11 to which one end of the reinforcing fiber sheet 1A is attached, and is attached to the other end to apply a tensile force to the reinforcing fiber sheet 1A. And a movable-side mounting means 12 to be provided.

The fixed side mounting means 11 is a rectangular sheet fixing plate member, and a sheet mounting portion 11A of this plate member.
One end of the reinforcing fiber sheet 1A is fixed by bonding or the like, and a bolt hole 11C is formed in the beam attachment portion 11B on the other side. The plate member 11 is attached to one side of the sheet attaching surface 101 of the concrete beam 100, which is a concrete structure, by using the bolt hole 11C of the beam attachment portion 11B and attached with the anchor bolt 18.

The movable side mounting means 12 has a sheet fixing angle member 13 and jack means 14. The sheet fixing angle member 13 is provided on a horizontal portion 13 installed on the other side of the sheet attaching surface 101 of the concrete beam 100.
A and a vertical portion 13B formed orthogonal to the horizontal portion 13A. One end of the reinforcing fiber sheet 1A is fixed to the horizontal portion 13A by bonding or the like, and the vertical portion 13B
Is connected to a movable distal end 15A of a hydraulic jack 15, for example, which constitutes the jack means 14. Also jack 1
5 is attached to a mounting base 16, the mounting base 16 is formed with a bolt hole 16 </ b> A, and the attaching surface 101 of the concrete beam 100 is used by using the bolt hole 16 </ b> A.
Is fixed to the same surface with bolts 17 or the like.

First, when the reinforcing method is applied, a sheet mounting portion 11A of a sheet fixing plate member 11 of a tensioning device 10 is fixed to one end of the reinforcing fiber sheet 1A using an adhesive or the like. A horizontal portion 13A of the sheet fixing angle member 13 is fixed to the other end of the sheet 1A using an adhesive or the like.

Next, as described above, the sheet fixing plate member 11 is the same as the sheet attaching surface 101 of the concrete beam 100, but the lower surface of the concrete beam 100 located on one side of the sheet attaching surface 101. In addition, as described above, it is fixed by the anchor bolt 13 using the bolt hole 11C.

On the other hand, the mounting base 16 of the jack means 12
Is fixed to the lower surface of the concrete beam 100 located on the other side of the sheet attaching surface 101 by the anchor bolt 17 using the bolt hole 16A, although it is the same surface as the sheet attaching surface 101 of the concrete beam 100. . Jack 1
5 has a sheet fixing angle member 1
3 vertical portions 13B are connected. By driving the jack 15, a tensile force is applied to the reinforcing fiber sheet 1A. The reinforcing fiber sheet 1A extends along the bonding surface 101 of the concrete beam 100, and a tension is introduced.

Another method is disclosed in Japanese Patent Application Laid-Open No. 2000-129.
As described in 929, it has been proposed to wind both ends or one end of a reinforcing fiber sheet around a roller provided in a tensioning device, and to introduce tension into the reinforcing fiber sheet by rotating the roller.

[0014]

However, as a result of conducting many research and experiments on the tension bonding method, the present inventors have found that when tension is introduced into a reinforcing fiber sheet, the reinforcing fiber sheet 1A as described above is used. Is fixed to the sheet fixing portion 11A of the sheet fixing plate member 11 of the tensioning device 10 using an adhesive or the like, and pulled with a jack 15 or the like.
Alternatively, when one or both ends of the reinforcing fiber sheet are pulled by being wound around a roller, the width of the reinforcing fiber sheet is reduced to 20 due to an installation error, inclination, or the like when the tensioning device 10 is installed.
cm, it becomes extremely difficult to uniformly introduce tension in the width direction, twisting occurs in the longitudinal direction of the reinforcing fiber sheet 1A, and in some cases, partial yarn breakage occurs. It was found that when the reinforcing fiber sheet 1A was adhered to the concrete structure 100, the intended reinforcing effect could not be obtained.

In particular, as in the case of the concrete girder 100, the length (L0) of the reinforcing fiber sheet 1A in the longitudinal direction is 10 m or more, and the length in the direction perpendicular to the longitudinal direction of the reinforcing fiber sheet 1A, that is, the width (W0). Such a tendency is remarkable when it is set to 30 to 50 cm.

That is, as shown in FIG. 7, one side or both sides of the reinforcing fiber sheet in which the reinforcing fibers 2 are arranged in one direction are supported by a mesh-like supporting member so as to facilitate the handling. As shown in FIG. 8, a structure in which the fibers 4 are weft threads and the fibers 4 are wefts are used to stop the fibers 2 in a direction orthogonal to the reinforcing fibers 2 arranged in one direction. It is merely a sheet having a structure like a so-called woven fabric (cloth), and the tension introduced into the reinforcing fiber sheet 1A is slightly loose or inclined at the time of attaching the tensioning device. It has been found that when the reinforcing fiber sheet 1A is not uniformly applied in the width direction, the reinforcing fiber sheet 1A is twisted or broken in the longitudinal direction.

Further, in order to tension the wide reinforcing fiber sheet 1A having a width (W0) of 30 to 50 cm, a considerably large tensioning device is required, and its installation is difficult and sometimes impossible. In some cases, further miniaturization and labor saving are demanded.

Accordingly, an object of the present invention is to provide a tension bonding method using a reinforcing fiber sheet, in particular, to enable introduction of tension without impregnation, and to improve reliability and workability. It is an object of the present invention to provide a reinforced fiber sheet and a method for reinforcing a concrete structure or a steel structure.

Another object of the present invention is to reduce the size and labor of the tensioning device without requiring a large tensioning device, and to use a tension bonding method using a reinforcing fiber sheet.
In particular, it is an object of the present invention to provide a reinforcing fiber sheet capable of introducing tension without impregnation, and having high reliability and improving workability, and a method for reinforcing a concrete structure or a steel structure. .

[0020]

The above object is achieved by a reinforcing fiber sheet and a method for reinforcing a structure according to the present invention.
In summary, according to the first aspect of the present invention, in a reinforcing fiber sheet in which continuous reinforcing fibers are uniformly aligned and arranged densely in one direction, at least one longitudinal end of the reinforcing fiber sheet is located at a distance from an edge. A reinforcing fiber sheet is provided which is divided into a plurality of pieces by a predetermined distance along a longitudinal direction.

According to one embodiment of the present invention, the reinforcing fibers are PAN-based or pitch-based carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; aramid, PBO (polyparaphenylene). Organic fibers such as benzobisoxazole), polyamide, polyarylate, and polyester are used singly or as a mixture of two or more kinds in a hybrid.

According to another embodiment of the first invention,
The reinforcing fiber sheet has one surface, or both surfaces, supported by a mesh-like support sheet, or fibers are arranged at regular intervals as wefts orthogonal to reinforcing fibers arranged in one direction. Has been driven.

According to another embodiment of the first invention,
The reinforcing fiber sheet is not impregnated with resin or is impregnated with resin.

According to another embodiment of the first invention,
In the reinforcing fiber sheet, an undivided region adjacent to the divided end is impregnated with a resin over a predetermined length along the longitudinal direction of the reinforcing fiber sheet, and is cured.

According to the second aspect of the present invention, the divided end portions formed on at least one end side of the reinforcing fiber sheet having the above-mentioned structure which is not impregnated with the resin or impregnated with the resin are each independently formed. Pull in the longitudinal direction of the reinforcing fiber sheet,
Provided is a method for reinforcing a structure, which comprises bonding the reinforcing fiber sheet to the surface of the structure while introducing uniform tension into the structure.

According to another embodiment of the second invention,
In the reinforcing fiber sheet, an undivided region adjacent to the divided end is impregnated with a resin over a predetermined length along the longitudinal direction of the reinforcing fiber sheet, and is cured.

According to another embodiment of the second invention,
The divided end portions formed on one end side of the reinforcing fiber sheet are wound around individually driven rollers, or connected to individually driven jack means, and each of the separated reinforcing fiber sheets is independently driven. Pulled longitudinally.

According to another embodiment of the second invention,
When bonding the resin-unimpregnated reinforcing fiber sheet to the surface of a structure, (a) the resin-unimpregnated reinforcing fiber sheet is
A process of adapting to the surface of the structure with tension applied,
(B) applying a resin from the reinforcing fiber sheet side, impregnating the reinforcing fiber sheet, and adhering the reinforcing fiber sheet to the surface of a structure, and (c) curing the resin.

According to another embodiment of the second invention,
The reinforcing fiber sheet is pressed and bonded to the structure surface side. At this time, the reinforcing fiber sheet can be pressed and bonded to the surface of the structure using a vacuum bag. Further, when the reinforcing fiber sheet has a resin impregnated and cured region in a region adjacent to the divided end portion,
A vacuum bag is installed by using the cured region.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a reinforcing fiber sheet and a method for reinforcing a structure according to the present invention will be described in more detail with reference to the drawings.

Embodiment 1 The reinforcing fiber sheet and the method of reinforcing a structure according to the present invention are applied to a concrete structure which is an architectural or civil structure, such as a beam or a girder member, or a slab member such as a wall, a column member or a floor slab. Although the present invention can be widely applied to reinforcement of an object or a steel structure, the present embodiment describes a case where the invention is applied to a concrete beam.

FIG. 1 shows an embodiment of the reinforcing fiber sheet 1 used in the present invention. The reinforcing fiber sheet 1 has a predetermined unit weight, in which continuous reinforcing fibers 2 are evenly arranged and densely arranged in one direction. Reinforced fiber sheet 1
(L0) and width (W0) of the concrete structure are appropriately determined according to the size and shape of the concrete structure to be reinforced.

Examples of the reinforcing fibers 2 include PAN-based or pitch-based carbon fibers; metal fibers such as boron fiber, titanium fiber, and steel fiber; and aramid, PBO (polyparaphenylene benzobisoxazole), polyamide, polyarylate, and the like. Organic fibers such as polyesters can be used alone or in a hybrid form by mixing plural kinds.

In order to facilitate the handling, the reinforcing fiber sheet 1 is provided on one side of a reinforcing fiber layer in which reinforcing fibers 2 are arranged in one direction, similarly to the conventional reinforcing fiber sheet 1A shown in FIG. Both surfaces can be configured to be supported by a mesh-like support sheet 3 made of, for example, glass fibers or organic fibers having a diameter of 2 to 50 μm. In the reinforcing fiber sheet 1 shown in FIG. 1, the support sheet 3 is omitted to simplify the drawing.

The method of holding the reinforcing fiber layer by the mesh-like support sheet 3 will be described with reference to FIG.
For example, the surfaces of the warp yarns 6 and the weft yarns 7 constituting the mesh-like support sheet 3 are impregnated in advance with a low melting point type thermoplastic resin, and the mesh-like support sheet 3 is
The warp yarns 6 and the weft yarns 7 of the mesh-like support sheet 3 are welded to the reinforcing fiber layer 4 by laminating on both sides of the reinforcing fiber layer made of

Alternatively, as in the case of the conventional reinforcing fiber sheet 1A shown in FIG. 8, a certain number of fibers 4 are used as weft yarns so that the fibers 2 are scattered at right angles to the reinforcing fibers 2 arranged in one direction. Driving at intervals, so-called cloth (cross)
It is also possible to use a sheet having the following structure. Fiber 4
In the same manner as above, for example, glass fibers or organic fibers having a diameter of 2 to 50 μm can be used. Composite fibers having such a double structure have a large effect of preventing fiber bundles from scattering, and are preferably used. In this method, there is no particular limitation on the weft driving interval (p).
It is selected in the range of mm interval.

According to the present invention, as shown in FIG. 1, the reinforcing fiber sheet 1 has at least one end in the longitudinal direction.
Two or more places are separated by a predetermined distance along the longitudinal direction. That is, at least one end in the longitudinal direction of the reinforcing fiber sheet 1 is divided into a plurality of pieces over a predetermined distance (L) from the end edge thereof in the longitudinal direction.

In the embodiment shown in FIG.
Is cut off at two places, so that the end is divided into three parts, divided ends 1a and 1c on both sides and a divided end 1b at the center. The number of divisions and the length of the division end are appropriately determined by the length and width of the reinforcing fiber sheet 1 which is appropriately dimensioned according to the size and shape of the concrete structure to be reinforced. Usually, the number of divisions is 2 to 4, and the length (L) of the division ends 1a, 1b, 1c is 30c
m or more, usually 30 cm to 5 m. The division mode (W1, W2, W3) is determined by the width (W) of the reinforcing fiber sheet 1.
It can be equally divided in the direction, but it can be different.

For example, in this embodiment, the concrete beam 1
When the PBO fiber is used as the reinforcing fiber in the reinforcing fiber sheet 1 used for reinforcement of No. 00, when the length in the longitudinal direction is 10 m and the width is 50 cm, the divided widths at both ends (W1, W2) ) Is 15 cm and the width at the center (W
Good results could be obtained by setting 2) to 20 cm and the length (L) of the split end to 50 cm.

In this embodiment, as described above, the reinforcing fiber sheet 1 has a fiber bundle in which about 2,000 monofilaments having a single denier of 1.5 denier are converged.
That is, the PBO fiber 2 was used, the PBO fibers were uniformly aligned, and the PBO continuous fiber sheet was densely arranged in one direction. The thickness of PBO continuous fiber sheet is 0.1
It was 28 mm (weight of fiber: 200 g / m ² ). Normal,
The fiber basis weight (weight per unit area: expressed in g / m ² ) of the PBO continuous fiber sheet 1 is 100 to 1600 g / m ^2.
2 (Design sheet thickness (t) 0.064 to 1.02 mm)
It is preferably 140 to 600 g / m ² (design sheet thickness (t) 0.090 to 0.38 mm).

Next, an embodiment of a tensioning method and a tensioning device for introducing a tension to the reinforcing fiber sheet 1 will be described.

According to the present invention, tension is applied to the reinforcing fiber sheet 1 before the reinforcing fiber sheet 1 is bonded to the concrete structure 100. The reinforcing fiber sheet 1 has not yet been impregnated with the resin.

According to the present embodiment, the tensioning device 10 is configured as shown in FIG.
As shown in FIG. 3 and FIG. 3, a fixed-side attachment means 11 to which one end of the reinforcing fiber sheet 1 is attached,
And a movable-side mounting means 12 for applying a tensile force to the reinforcing fiber sheet 1.

In this embodiment, the fixed side mounting means 11 is
As in the case of the tensioning device 10 shown in FIGS. 5 and 6 in the related art, a rectangular sheet fixing plate member 11 is formed, and one end of the reinforcing fiber sheet 1 is fixed to a sheet mounting portion 11A of the plate member by bonding or the like. You. Beam mounting part 1 on the other side of the plate member
A bolt hole 11C is formed in 1B, and the plate member is
Using the bolt hole 11C, the concrete beam 100
And is attached by bolts 18 at one side of the sheet sticking surface 101.

In this embodiment, the movable side mounting means 12 is
Roller device.

That is, in this embodiment, the roller device 12
According to the present embodiment, three divided ends 1a, 1b, and 1 are provided according to the number of divided ends of the reinforcing fiber sheet 1.
c, the three rollers 21 (21a, 21a,
21b, 21c) are arranged. Each roller 21 (21
a, 21b, 21c) are rotatably supported by angle support plates 23 (23a, 23b, 23c) fixed to the mounting base 22, and driving means provided at one end thereof, for example, driving motors M (Ma, Mb) , Mc). The mounting base 22 is attached to the concrete beam 100 with the anchor bolt 2.
4 and so on.

According to this embodiment, when the reinforcing method of the present invention is applied, first, one end of the reinforcing fiber sheet 1 is
The sheet fixing portion 11A of the sheet fixing plate member 11 of the tensioning device 10 is fixed using an adhesive or the like. Next, as described above, the sheet fixing plate member 11 is on the same surface as the sheet attaching surface 101 of the concrete beam 100, but is located on one side of the sheet attaching surface 101.
As described above, the lower surface of the fixing member 00 is fixed by the anchor bolt 13 using the bolt hole 11C.

On the other hand, the mounting base 22 of the roller device 12
The concrete beam 100 is fixed to the lower surface of the concrete beam 100 located on the other side of the sheet attaching surface 101 by an anchor bolt 24, although the surface is the same as the sheet attaching surface 101.

Next, the divided end portions 1a, 1b, 1c of the reinforcing fiber sheet 1 are
(21a, 21b, 21c). Any method can be adopted as the winding fixing method. For example, the leading ends of the divided ends 1a, 1b, 1c of the reinforcing fiber sheet 1 are bonded and fixed to the surfaces of the rollers 21 (21a, 21b, 21c) with an adhesive. Alternatively, the tip may be inserted into a slit (not shown) formed on the surface of the roller and wound and fixed.

Thereafter, each roller 21 (21a, 21b,
21c) is rotated by urging the drive motor M (Ma, Mb, Mc) to apply a tensile force to the reinforcing fiber sheet 1. The reinforcing fiber sheet 1 is a concrete beam 100
Is stretched along the sticking surface 101, and tension is introduced.
The speed, drive timing, and the like of each drive motor M (Ma, Mb, Mc) are appropriately controlled so that twisting does not occur in the longitudinal direction of the reinforcing fiber sheet 1.

The introduction of tension into the reinforcing fiber sheet 1 is stopped when a predetermined amount of tension is pulled, or a tension cell is measured by installing a load cell or the like at an appropriate position on the fixed side mounting means 11. While driving motor M (Ma,
Mb, Mc), and the drive of the drive motor M (Ma, Mb, Mc) can be stopped when a predetermined load is applied.

In this state in which tension is applied to the reinforcing fiber sheet 1, an adhesive, that is, a matrix resin is applied from the reinforcing fiber sheet 1 side to impregnate the resin into the reinforcing fiber sheet 1, and the reinforcing fiber sheet 1 is removed. It adheres to the sticking surface 101 of the concrete beam 100.

It is preferable to press the reinforcing fiber sheet 1 toward the concrete beam 100 in order to adhere the impregnated reinforcing fiber sheet 1 to the bonding surface 101 of the concrete beam 100 without generating a gap. Although any means can be used as the pressing means, the reinforcing portion of the reinforcing fiber sheet 1 impregnated with a vacuum bag and a sealing material is completely wrapped, the air in the wrap is sucked by a pump, and the sheet is reinforced. It is preferable that the material be pressed against an object and cured at room temperature.

Also, as shown in FIGS. 2 and 3, the reinforcing portion of the reinforcing fiber sheet 1 is completely wrapped by using a vacuum bag and a sealing material, and the air in the wrap can be efficiently sucked by a pump. , Reinforced fiber sheet 1
Is that an undivided area (R1) adjacent to the divided ends 1a, 1b, 1c and an area (R2) adjacent to the opposite fixed-side attaching means 11 extend along the longitudinal direction of the reinforcing fiber sheet. It is also possible to impregnate the resin in advance for a predetermined length (L1), for example, about 10 cm, and to cure the resin. The formation of such cured regions R1 and R2 can be performed after the introduction of tension, but as a result of research conducted by the present inventors, prior to the introduction of tension to the reinforcing fiber sheet 1 by the tensioning device 10, Thus, even if such hardened portions R1 and R2 are formed in the reinforcing fiber sheet 1, it has been found that there is no problem in introducing the tension into the reinforcing fiber sheet 1 by the tensioning device 10.

Further, it is preferable that a primer is applied to the surface of the concrete beam 100 before the reinforcing fiber sheet 1 is adhered to perform a base treatment. Further, a matrix resin can be applied in advance.

The matrix resin may be a thermosetting resin, and the thermosetting resin may be a room temperature or thermosetting epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol. Resins can be suitably used. The resin impregnation amount is 30 to 70% by weight, preferably 40 to 60% by weight. As the primer, the same or the same resin as the matrix resin, for example,
It may be a commonly used epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin.

When the matrix resin is cured and the resin-impregnated reinforcing fiber sheet is completely adhered to the surface of the concrete structure, the drive motor M (Ma, Mb, Mc)
At a predetermined speed, for example, 100 to
The tension is released at a constant load speed corresponding to 500 N / mm ² .

Thereafter, both ends of the reinforced fiber sheet 1 in which the resin is hardened to be a fiber reinforced plastic (FRP member) are cut, and the sheet fixing plate member 11 and the roller device 1 are cut.
2 is removed from the concrete structure surface 101.

Further, it is also possible to repeat the above-mentioned steps on the cured FRP member and to laminate a plurality of layers of the reinforcing fiber sheet 1 on the surface of the concrete structure.

The reinforcing fiber sheet impregnated with the resin and hardened, that is, the both ends of the FRP member are, for example, on both ends to prevent peeling, the reinforcing fibers are the same as or different from the reinforcing fiber sheet. It can be reinforced by sticking an end reinforcing sheet (not shown) made of a reinforcing fiber sheet using a material, or attaching a metal reinforcing plate (not shown) with bolts or the like. it can.

In the above embodiment, the reinforcing fiber sheet 1 is divided only at one end and the divided ends 1a, 1b, 1c are formed. However, both ends of the reinforcing fiber sheet 1 are similarly divided. It is also possible to arrange the roller device 12 having the above-described configuration at both ends, and to pull the divided ends of both ends by the roller device 12.

In the above embodiment, the rollers 21 (21a, 21b, 21c) are mounted on individual shafts in the roller device 12, and are controlled to be driven. However, they are arranged coaxially. It is also possible to adopt a configuration in which drive control is performed individually.

Second Embodiment In the first embodiment, the tension device 10 is described as being pulled at one end or both ends by using the roller device 12, but the conventional tension device described with reference to FIGS. It is also possible to use the apparatus 10 and use the movable side mounting means 12 having the sheet fixing angle member 13 and the jack means 14.

That is, as shown in FIG. 4, the reinforcing fiber sheet 1 has divided ends 1a, 1b, 1c fixed to the horizontal portion 13A of the sheet fixing angle member 13 (13a, 13b, 13c) by bonding or the like. Is done. In FIG. 4, the manner of connection with the jack means 14 is not shown, but as shown in FIG. 6, the movable tip 15 A of the hydraulic jack 15, which constitutes the jack means 14, is provided on the vertical portion 13 </ b> B, respectively. Be linked.

As in the conventional case, by driving each jack 15, a tensile force is applied to the reinforcing fiber sheet 1, whereby the concrete beam 100 is attached to the reinforcing fiber sheet 1 as in the first embodiment. It extends along the attachment surface 101, and tension is introduced.

Also in this embodiment, both ends of the reinforcing fiber sheet 1 are divided in the same manner, and the divided ends 1a, 1b, 1c
Can be formed. In this case, the jack means 14 may be configured to pull the divided ends 1a, 1b, 1c at both ends from each other.

As understood from the first and second embodiments,
According to the present invention, since the tensioning device can individually tension the divided ends of the reinforcing fiber sheet 1, there is no need for a large tensioning device, so that the tensioning device can be reduced in size and labor can be saved. Can be achieved.

Example 3 In Examples 1 and 2 above, a reinforcing fiber sheet 1 not yet impregnated with a resin was used, and a tension was introduced into this reinforcing fiber sheet 1 using a tensioning device 10. Although the reinforced fiber sheet 1 is impregnated with resin and adhered to the surface of the concrete structure, a reinforced fiber sheet impregnated with resin may be used.

That is, tension can be introduced into the reinforcing fiber sheet 1 using the tensioning device 10 while impregnating the resin, and the reinforcing fiber sheet 1 can be bonded to the surface of the concrete structure. Furthermore, it is also possible to impregnate the reinforcing fiber sheet 1 with a matrix resin in advance, apply tension to the resin-impregnated reinforcing fiber sheet 1 in the form of a prepreg by using a tensioning device, and adhere to the surface of the concrete structure. It is.

The matrix resin can be a thermosetting resin, as in the case of the first embodiment. The thermosetting resin may be a room temperature or thermosetting epoxy resin, vinyl ester resin, MMA Resins, unsaturated polyester resins, or phenolic resins can be suitably used. The resin impregnation amount is 30 to 70% by weight, preferably 40 to 60% by weight. In the resin-impregnated reinforced fiber sheet 1 in the prepreg form, the resin is adhered to the surface 101 of the concrete structure 100 using a resin. As the adhesive resin, a resin similar to or similar to the matrix resin can be used.

The sticking surface 101 of the concrete beam 100 is
Prior to bonding the reinforcing fiber sheet 1, it is preferable to apply a primer in advance and perform a base treatment. Also,
A matrix resin may be applied in advance.

As in the case of the first embodiment, a vacuum bag and a sealing material are used to adhere the reinforcing fiber sheet 1 as a prepreg to the bonding surface 101 of the concrete beam 100 without generating a gap. It is preferable to use a vacuum bag which completely wraps the reinforcing portion of the reinforcing fiber sheet 1 and heats it using an autoclave as needed.

The steps after the matrix resin is cured and the resin-impregnated reinforced fiber sheet is completely adhered to the surface of the concrete structure are the same as those described in Example 1, and the description thereof will not be repeated.

Although the above embodiment has been described with reference to the reinforcement of a concrete structure, the present invention can be similarly applied to the reinforcement of a steel structure, and the same operation and effect can be achieved.

[0075]

As described above, the reinforcing fiber sheet and the method of reinforcing a structure according to the present invention provide a method of uniformly aligning continuous reinforcing fibers and forming a reinforcing fiber sheet that is densely arranged in one direction. Since one end in the longitudinal direction of the reinforcing fiber sheet is divided into a plurality of pieces by a predetermined distance along the longitudinal direction from the edge, (1) the tension bonding method using a fiber sheet, Tension can be introduced by impregnation, and high reliability and workability can be improved. (2) The tension device can be reduced in size and labor can be saved without requiring a large tension device. Such an effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a reinforcing fiber sheet according to the present invention.

FIG. 2 is a schematic structural view of one embodiment of a tensioning device for tensioning a reinforcing fiber sheet of the present invention, and is a schematic perspective view showing a state in which the reinforcing fiber sheet is attached to the tensioning device.

FIG. 3 is a schematic configuration diagram showing a mode in which a roller device constituting the tensioning device is attached to a sticking surface of a concrete structure, as viewed from the back surface side of FIG. 2;

FIG. 4 is a schematic structural view of another embodiment of the tensioning device for tensioning the reinforcing fiber sheet of the present invention, and is a schematic perspective view showing a state where the reinforcing fiber sheet is attached to the tensioning device.

FIG. 5 is a view for explaining a conventional method of reinforcing a concrete structure.

FIG. 6 is a perspective view showing a state in which a conventional reinforcing fiber sheet is attached to a tensioning device.

FIG. 7 is a perspective view showing an example of a conventional reinforcing fiber sheet to which the present invention can be applied.

FIG. 8 is a perspective view showing another example of a conventional reinforcing fiber sheet to which the present invention can be applied.

DESCRIPTION OF SYMBOLS 1 Reinforced fiber sheet 1a, 1b, 1c Divided end 2 Reinforced fiber 3 Support 4 Barring fiber 10 Tensile device 11 Fixed side mounting means (sheet fixing plate member) 12 Movable side mounting means 21a, 21b, 21c roller 13 sheet fixing angle member 14 jack means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04G 23/02 E04G 23/02 D (71) Applicant 599104369 Nippon Steel Composite Co., Ltd. Nihonbashi Kobunacho, Chuo-ku, Tokyo 3-8 (71) Applicant 000003160 Toyobo Co., Ltd. 2-2-2 Dojimahama, Kita-ku, Osaka-shi, Osaka (72) Inventor Tomofuka Kure 1-9-1, Mikaharacho, Hitachi-shi, Ibaraki (72) Inventor Keiji Hayashi 3-13-3, Rokujo-Omizo, Gifu City, Gifu Prefecture Inside Abe Industrial Co., Ltd. (72) Inventor Tetsuro Higuchi 11 Niigatacho, Niigata City, Niigata Pref. Toho Earth Tech Co., Ltd. Toshikazu Takeda 3-8 Nihonbashi Kobunacho, Chuo-ku, Tokyo Nippon Composite Corporation (72) Inventor Nobuyoshi Murakami 3-8 Nihonbashi Kobunacho, Chuo-ku, Tokyo Inside Iron Composite Corporation (72) Inventor Yuji Hirata 2-2-8 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture Inside Toyobo Co., Ltd. (72) Inventor Tokuaki Koseki 2-2-2 Dojimahama, Kita-ku, Osaka-shi, Osaka No. Toyobo Co., Ltd. F term (reference) 2E164 CA02 CA15 CA17 2E176 AA01 BB29 4L047 AA02 AA03 AA19 AA21 AA23 AA24 AA28 BA06 BA07 CA04 CA07 CB01 CC10 CC13

Claims (13)

[Claims] 1. In a reinforcing fiber sheet in which continuous reinforcing fibers are uniformly aligned and arranged densely in one direction, at least one longitudinal end of the reinforcing fiber sheet is a predetermined distance along the longitudinal direction from the edge. A reinforced fiber sheet divided into a plurality of pieces. 2. The reinforcing fiber is a PAN-based or pitch-based carbon fiber; a metal fiber such as a boron fiber, a titanium fiber, and a steel fiber; an aramid, PBO (polyparaphenylene benzobisoxazole), a polyamide, a polyarylate, and a polyester. 2. The reinforcing fiber sheet according to claim 1, wherein the organic fiber is used alone or in combination of two or more. 3. The reinforcing fiber sheet according to claim 1, wherein one side or both sides of the reinforcing fiber sheet are supported by a mesh-like support sheet. 4. The reinforcing fiber according to claim 1, wherein the reinforcing fiber sheet has fibers inserted as wefts at regular intervals perpendicular to the reinforcing fibers arranged in one direction. Fiber sheet. 5. The reinforcing fiber sheet according to claim 1, wherein the reinforcing fiber sheet is not impregnated with a resin or is impregnated with a resin. 6. The unreinforced region adjacent to the divided end of the reinforcing fiber sheet is impregnated with a resin over a predetermined length along a longitudinal direction of the reinforcing fiber sheet,
The reinforcing fiber sheet according to claim 5, wherein the reinforcing fiber sheet is hardened. 7. A divided end formed on at least one end of a reinforcing fiber sheet which is not impregnated with resin or which is impregnated with resin according to any one of claims 1 to 4. A method for reinforcing a structure, characterized in that the reinforcing fiber sheet is independently pulled in the longitudinal direction, and is adhered to the surface of the structure while a uniform tension is applied to the reinforcing fiber sheet. 8. The reinforcing fiber sheet is such that an undivided region adjacent to the divided end portion is impregnated with a resin over a predetermined length along a longitudinal direction of the reinforcing fiber sheet,
The method for reinforcing a structure according to claim 7, wherein the structure is hardened. 9. A divided end formed at one end of the reinforcing fiber sheet may be wound around individually driven rollers or connected to individually driven jack means to be independent of each other. 9. The method for reinforcing a structure according to claim 7, wherein the reinforcing fiber sheet is pulled in a longitudinal direction of the reinforcing fiber sheet. 10. When the resin-unimpregnated reinforcing fiber sheet is bonded to the surface of a structure, (a) the resin-unimpregnated reinforcing fiber sheet conforms to the surface of the structure under tension. (B) applying a resin from the reinforcing fiber sheet side, impregnating the reinforcing fiber sheet, and adhering the reinforcing fiber sheet to the surface of a structure, and (c) curing the resin. The method for reinforcing a structure according to claim 7 or 8, wherein: 11. The reinforced fiber sheet is pressed against a surface of a structure and adhered thereto.
0. The method for reinforcing a structure according to any one of items 0. 12. The method for reinforcing a structure according to claim 11, wherein the reinforcing fiber sheet is pressed against a surface of the structure using a vacuum bag and adhered. 13. When the reinforcing fiber sheet has a resin-impregnated hardened area in an area adjacent to the divided end, a vacuum bag is installed using the hardened area. Item 13. A method for reinforcing a structure according to Item 12.