JP2002357002A - Sheet material for repairing and reinforcing concrete and concrete structure using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material for repairing and reinforcing concrete, through which a resin and air are passed excellently in the thickness direction and which has superior resin impregnating ability, draping properties and strength and is executed easily at a low cost, and a concrete structure using it. SOLUTION: The sheet material for repairing and reinforcing concrete is composed of a reinforced fiber section 2 containing one or two or more of layers 2X and 2Y in which a plurality of reinforced fiber yarn strips 2x and 2y are arrayed mutually in parallel and a supporting material 3 arranged on at least one side of the reinforced fiber section 2. The reinforced fiber yarn strip 2y is arrayed in the longitudinal direction Y of the supporting material 3 in at least one layer 2Y of the reinforced fiber section 2, and the reinforced fiber section 2 and the supporting material 3 are unified by stitch yarn 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced plastic (hereinafter referred to as F) for repairing and reinforcing concrete structures.
The present invention relates to a concrete repair / reinforcement sheet material useful as a reinforcing fiber base material of a layer (RP) and a concrete structure using the same.

[0002]

2. Description of the Related Art In recent years, with regard to countermeasures for aging and seismic reinforcement of concrete structures, concrete construction and repair sheets made of reinforcing fibers such as carbon fibers are used for concrete structures. FR on site on the surface
Many sheet construction methods for forming a P layer are employed.

In this method, first, dirt is removed from the surface of the concrete to be repaired / reinforced, and the unevenness of the surface is corrected to ensure its flatness. Next, a primer is applied to the concrete surface in order to increase the adhesion of the formed FRP layer to the concrete surface. After the primer is solidified, a resin serving as a matrix of the FRP layer is applied thereon, and then a dry sheet in an unimpregnated state is arranged on the resin layer, and further an impregnating roller is applied to the dry sheet, The dry sheet is impregnated with resin.

[0004] When stronger reinforcement is required, the operations of applying a resin, disposing a dry sheet, and impregnating the resin with an impregnating roller are repeatedly performed. If the concrete structure to be repaired and reinforced is, for example, a deck of a bridge, it is necessary for the worker to perform the above-described resin impregnation work in an upward posture. If the concrete structure is a pier or a chimney, the vertical surface must be impregnated with resin.

[0005] Therefore, in order to prevent the resin from dripping during operation, a resin having an extremely high viscosity is used. Therefore, the dry sheet used has good resin impregnating properties even if the resin has a high viscosity, and also squeezes out excess resin remaining between the concrete structure and the sheet during work and removes entrapped air. There is a demand for one having such a property that it can be easily moved.

Conventionally, as a sheet used in the above-mentioned sheet method, a plurality of reinforcing fiber yarns are arranged in parallel with each other in the length direction of the sheet, and this is bonded and integrated with a mesh-like support material. Tow sheets are often used. This tow sheet has the advantage that it can be manufactured under high productivity, but on the other hand, as the basis weight increases, the fiber density increases and the reinforcing fiber yarns overlap with each other, Since it becomes difficult to remove the excess resin and the entrapped air in the thickness direction of the toe sheet, the impregnating roller is laid in the width direction of the toe sheet to remove the excess resin and the entrapped air into the sheet. Has been removed from the end.

However, when the reinforcing fiber yarns are arranged in the length direction of the concrete structure to repair and reinforce the vertical surface, the impregnating roller can be naturally hooked up and down as a human motion. Rolling is unnatural, and not only is it difficult for an operator to apply force to the roller, but also the joints can be hurt, so performing this operation continuously for a long time is painful.

Further, when the tow sheet is rolled in the width direction, the tow sheet is rolled in a direction perpendicular to the arrangement direction of the reinforcing fiber yarns. There is also a problem that a desired reinforcing strength cannot be obtained due to bending. Further, in the case of the tow sheet, since the reinforcing fiber yarns are arranged in the length direction of the sheet, and the reinforcing fiber yarns are bonded and integrated with the mesh-like support material, they do not have a drape property like a film or paper. So, paste the sheet according to the curved surface, FR there
It was difficult to form a P layer.

In order to cope with the above-mentioned problems, a unidirectional woven fabric in which reinforcing fiber yarns are arranged in the length direction, thin glass fibers are inserted in the width direction, and these are integrated in a woven structure has been proposed as a sheet. (Japanese Patent Laid-Open No. 10-102792)
Reference). According to the one-way woven fabric, in the low-weight area, a gap is provided between the reinforcing fiber yarns, and excess resin or embraced air can pass through the gap.
Resin and air can be removed in the thickness direction of the sheet.

[0010] However, when the basis weight increases,
The density (number of yarns) of the reinforcing fiber yarns increases, and in the case of a loom, due to the opening and closing movement of the warp yarns by the healds, adjacent warp yarns rub against each other, causing fuzz and poor operability. In addition, there is a problem that the gap between the reinforcing fiber yarns becomes smaller, the fiber density becomes larger, and it becomes difficult to remove resin and air in the thickness direction of the woven fabric.

In the case of a unidirectional woven fabric using glass fibers thin in the width direction, the crimp of the reinforcing fibers in the warp direction due to the crossing of the warp yarn and the weft yarn is small, but the reinforcing fiber yarns thick in the width direction are also used. In the case of a bidirectional woven fabric, the crimp between the reinforcing fiber yarns arranged in the length direction and the width direction becomes large, and the strength of the FRP layer is increased by stress concentration based on the bending of the fiber yarns. There is also a problem that is reduced.

[0012]

DISCLOSURE OF THE INVENTION The present invention solves all of the problems in the prior art described above, and allows resin and air to pass through in the thickness direction to provide excellent resin impregnation, excellent drape, and repair of curved surfaces.・ Reinforcement sheet material that is inexpensive and easy to install, suitable for reinforcement, and furthermore, the meandering and bending of the reinforcing fiber yarns are suppressed and the strength is secured.
An object is to provide a concrete structure using the same.

[0013]

According to the present invention, there is provided a reinforcing material comprising one or more layers in which a plurality of reinforcing fiber yarns are arranged in parallel with each other. A fiber portion, and a support material disposed on at least one side of the reinforcing fiber portion. In at least one layer of the reinforcing fiber portion, the reinforcing fiber yarns are arranged in a length direction of the support material. And a sheet material for concrete repair / reinforcement, wherein the reinforcing fiber portion and the support material are integrated with a stitch yarn.

[0014] Preferably, the reinforcing fiber portion includes only a layer in which the reinforcing fiber yarns are arranged in the length direction. Further, the reinforcing fiber portion includes two layers in which the reinforcing fiber yarns are arranged in a length direction and a width direction of the support material, respectively. In that case, the fiber weight of the reinforcing fiber yarn in each layer of the reinforcing fiber portion exceeds 100 g / m ² and is 500 g / m ^2.
Preferably, it is less than m ² .

In the present invention, in the reinforcing fiber portion, the arrangement of the reinforcing fiber yarns is a mesh, and the fiber weight of the reinforcing fiber yarns in each layer of the reinforcing fiber portion is 20 g / m ² . Provided is a concrete repair / reinforcement sheet material having an excess of less than 100 g / m ² . In addition,
The support is preferably a non-woven fabric. Further, the support material may be a sack cloth. Preferably, the reinforcing fibers are carbon fibers.

In this case, the reinforcing fiber yarn is JIS
It is preferable that the hooking strength measured in accordance with the L1013 method is 900 N or more per 0.9 mm ² in cross-sectional area. Further, it is preferable that the support member has a slit cut in its length direction. Further, in the present invention, there is provided a concrete structure characterized in that the surface is repaired and reinforced by a fiber-reinforced plastic comprising the above-mentioned sheet material for repairing and reinforcing concrete.

[0017]

1 is a schematic partial perspective view for explaining a concrete repair / reinforcement sheet material 1 according to the present invention, and FIG. 2 is a schematic partial plan view. As shown in FIG. 1, in the sheet material 1, the reinforcing fiber portion 2 is disposed on the support material 3, and the reinforcing fiber portion 2 and the support material 3 are integrated with the stitch yarn 4. The reinforcing fiber portion 2 has a plurality of reinforcing fiber yarns 2y ₁ , 2y ₂ , 2y ₃ ... (Hereinafter referred to as 2y) arranged in a straight line in the longitudinal direction Y of the support member 3 and in parallel with each other. The layer 2Y thus formed is included. Each reinforcing fiber yarn 2y is a multifilament and is composed of a plurality of filaments 2a.

The stitch yarn 4 is made of a reinforcing fiber
By penetrating the fiber part 2 and the support material 3, the reinforcing fiber part
2 and the support member 3 are sewn together to integrate them.
The stitching structure formed by the stitch thread 4 in stitching integration
For example, single chain stitching and 1/1 tricot knitting
I can do it. In this case, the sewing structure of the stitch thread 4 is as shown in FIG.
As shown in FIG. ₁, 4_Two, 4_Three, ... is supported
While drawing a loop in the width direction X of the holding material 3,
Stitch yarn 4
In the length direction Y and the width direction X, a predetermined
It has a gap g and a pitch p.

[0019] Thus, the sheet material 1 over its entire surface, the stitch yarn 4 _1, 4 _2, 4 _3, set 2Y ₁ a plurality of filaments 2a is the ... are constrained, 2Y _2, 2
Y ₃ ,... Are formed, and at the same time, this set 2Y ₁ ,
A gap P where no filament 2a exists in the thickness direction of the sheet material 1 is formed between each of 2Y ₂ , 2Y ₃ ,... According to the arrangement interval g of the stitch yarns.

Since the filament 2a does not exist in the thickness direction of the sheet material 1, the gap P serves as a passage for resin and air. For this reason, even when the sheet material 1 has a large reinforcing fiber weight and the sheet material 1 becomes thicker, the resin first flows in the thickness direction from this passage during the resin impregnation, and then the sheet material 1 flows through this passage by capillary action. The resin impregnation in the in-plane direction proceeds. Therefore, even if the high-weight sheet material 1 is impregnated with a high-viscosity resin, the resin can be sufficiently impregnated, the impregnation time is shortened, and the working efficiency is improved.

Further, since the excess resin is squeezed out between the concrete surface and the sheet material 1 and the air entrapped therein can be reliably removed in the thickness direction of the sheet material 1 by this passage, the reliability is improved. Excellent repair and reinforcement work is possible. Further, since the reinforcing fiber yarn 2y is constrained by the stitch yarn 4, the meandering of the fiber yarn 2y is suppressed during the resin impregnation operation by hand impregnation such as rolling, and accurate fiber orientation is achieved. It is possible to secure sufficient strength in the formed FRP layer.

In the sheet material 1, there is no bending (crimp) due to the crossing of the yarns found in the woven fabric, and the multifilament reinforcing fiber yarns 2 y are arranged straight and stitched together with stitch yarns 4. Therefore, even if stress acts on the FRP layer formed by using this, there is no stress concentration on the reinforcing fiber yarn 2y and the resin. Therefore, the FRP layer has high strength and high rigidity by sufficiently exhibiting the properties of the reinforcing fiber, and can effectively reinforce the concrete structure.

The location where the stitch yarn 4 penetrates the reinforcing fiber portion 2 has nothing to do with the arrangement of the reinforcing fiber yarn 2y, and even if the stitch yarn 4 penetrates the reinforcing fiber yarn 2y. Good. For example, in FIG.
_{Y 1, 2Y 2, 2Y 3} , ... are shown as corresponding to the two reinforcing fiber yarns 2y. Also, because there is no entanglement in the width direction X of the support 3 is the reinforcing fiber yarns 2y stitch yarn 4 formed, 4 _1, 4 _2, 4 _3, set 2Y ₁ filament 2a constrained ... in, 2Y ₂ , 2Y ₃ , ...
The sheet material 1 is formed by being sewn with the support material 3.

FIG. 3 is a schematic partial perspective view illustrating another concrete repair / reinforcement sheet material 1 'according to the present invention. FIG. 4 is a partially enlarged cross-sectional view taken along line AA' in FIG. It is a figure and is a schematic fragmentary enlarged sectional view for explaining organization of sheet material 1 'in the circumference where stitch thread 4 has penetrated sheet material 1'. Note that the same components as those of the above-described sheet material 1 are denoted by the same reference numerals, and description thereof will be omitted.

The sheet material 1 ′ has a reinforcing fiber portion 2 in which two layers, ie, a layer 2 Y and a layer 2 X, are laminated.
In Y, the plurality of reinforcing fiber yarns 2y are
Are arranged straight in the length direction and parallel to each other. Then, in the layer 2X, reinforcing fiber yarns 2x ₁ a plurality of, 2x _2, 2x ₃ ... (hereinafter, referred to as 2x) is straight in the width direction X of the support 3, and are arranged in parallel to each other I have. Note that, like the reinforcing fiber yarn 2y, the reinforcing fiber yarn 2x is also a multifilament composed of a plurality of filaments 2a.

Then, in a state where the reinforcing fiber portion 2 is arranged on the support material 3 so that the layer 2X is in contact with the support material 3,
The support material 3 and the reinforcing fiber portion 2 are stitched and integrated with the stitch thread 4. In this case, as shown in FIG. 4, the layer 2Y, the layer 2X, and the support member 3 are integrated by a stitch yarn 4 forming, for example, a tricot knitting structure. When the stitching structure is formed, the tension of the stitch thread 4 acting in the length direction Y causes the reinforcing fiber thread 2x of the layer 2X and the fiber of the support material 3 between the stitch thread 4 and the stitch thread 4. A void Q that does not exist is formed.

As described above, since the gap P and the gap Q are formed at locations where the stitch yarns 4 penetrate the sheet material 1 'over the entire surface of the sheet material 1', the thickness direction of the sheet material 1 ' In addition, a resin and air passage without the filament 2a is formed. For this reason, even if the sheet material 1 'has a large reinforcing fiber weight and the sheet material 1' becomes thicker, the resin first flows in the thickness direction from this passage during resin impregnation, and then the sheet material flows from this passage by capillary action. The resin impregnation in the in-plane direction of 1 ′ proceeds. Therefore, even if the high-weight sheet material 1 'is impregnated with a high-viscosity resin, the resin can be sufficiently impregnated, the impregnation time is shortened, and the working efficiency is improved.

Further, by this passage, excess resin can be squeezed out between the concrete surface and the sheet material 1 ', and the air entrapped therein can be reliably degassed in the thickness direction of the sheet material 1'. Repair and reinforcement work with excellent reliability is possible. Further, since the reinforcing fiber yarns 2x and the reinforcing fiber yarns 2y are restrained by the stitch yarns 4, meandering of the fiber yarns at the time of resin impregnation work by hand impregnation such as roller hanging is suppressed, and accurate Fiber orientation can be ensured, and sufficient strength is ensured in the formed FRP layer.

In the sheet material 1 ', the reinforcing fiber yarns 2y and the reinforcing fiber yarns 2x are arranged in both directions of the length direction Y and the width direction X. Since the multifilament reinforcing fiber yarns 2x and 2y are arranged straight and stitched and integrated with the stitch yarn 4, stress is not applied to the FRP layer formed by using this. However, there is no stress concentration on the reinforcing fiber yarns 2x and 2y and the resin. Therefore,
The FRP layer has high strength and high rigidity by sufficiently exhibiting the properties of the reinforcing fiber, and can effectively reinforce a concrete structure.

Each of the reinforcing fiber portions of the sheet material of the present invention
The basis weight of the reinforcing fiber of the layer is 100 g / m ^TwoOver 500g /
m^TwoIt is preferably less than. Stitch thread to sheet material
Reinforcement fibers are present partially, though partially
Without passing through it, so that the resin easily passes through it.
Compared to the sheet material of relatively high
Fat impregnation is not impaired, but 500 g / m^Twothat's all
In such a case, the resin impregnation rate is undesirably slow. Ma
100g / m^TwoWhen it is less than the specified thickness,
The number of sheet materials required for
It is not preferable because it takes time to form the layers. In each layer
A more preferable range of the basis weight of the reinforcing fiber is 150 g / m
^TwoOver 400g / m^TwoIs less than.

The reinforcing fibers used in the present invention are so-called high-strength, high-modulus fibers, such as glass fibers, vinylon fibers, polyethylene fibers, polyparaphenylene benzobisoxazole fibers, polyarylate fibers, aramid fibers, and the like. Carbon fibers can be mentioned. Above all,
Carbon fibers which have low hygroscopicity, have fire resistance, are hardly corroded by alkali components of concrete, and have excellent adhesiveness to resin are preferably used.

The carbon fiber is JIS L 10
It is preferable that the hooking strength defined by the method 13 is 900 N or more per 0.9 mm ² in cross-sectional area. Hook strength is 90
If it is less than 0N, the single thread of the carbon fiber is cut by the needle penetrating operation, many fluffs with a short fiber length are generated and fly in the air, and the working environment becomes extremely poor. In addition, it is necessary to wear dustproof clothes, which leads to a reduction in workability.

Further, when the hooking strength is less than 900 N,
In particular, when carbon fiber yarns are arranged in the width direction of the sheet, since the needles are arranged in a line in this direction in the sewing machine, the carbon fibers cannot avoid the needles rising at a high speed all at once, and the sheet A large amount of fuzz is generated in the carbon fiber yarns in the width direction constituting the material, and F is formed using the fuzz.
It is difficult to secure sufficient strength in the RP layer.

The thickness of the reinforcing fiber used in the present invention is 3
It is preferably from 00 to 5,000 tex. 300
If it is less than tex, the unit price of the yarn is high, and
If it exceeds 00 tex, the surface of the formed FRP layer becomes uneven. In particular, a thick reinforcing fiber yarn having a thickness of 600 to 5,000 tex is more preferable because the unit price is low and a sheet material formed by using the same is also low cost.

However, in this case, if the basis weight of the reinforcing fibers per layer in the reinforcing fiber portion is small, the density of the reinforcing fibers tends to be non-uniform in the layer, and in such a state, the reinforcing fiber yarns are integrated with stitch yarn. When the sheet material is manufactured and the FRP layer is formed from the sheet material, the thickness of the FRP layer becomes thicker at the place where the fiber density is high, and becomes thinner at the place where the fiber density is low, and the surface becomes uneven. Become.

In order to avoid such a situation, 600 to
When using a 5,000-tex thick reinforcing fiber yarn, the reinforcing fiber yarn can be spread thinly by roller swinging operation or air jet injection before the stitching yarn is integrated. Is preferred because the FRP layer has a uniform density and a smooth surface FRP layer can be obtained. Further, the sheet material of the present invention has a reinforcing fiber portion composed of two layers,
In each layer, the reinforcing fiber yarns are arranged in the length direction and the width direction of the sheet material, and the sets in which the reinforcing fiber yarns are restrained by the stitch yarns in each layer are arranged apart from each other,
When the reinforcing fiber portion is viewed from above, the reinforcing fiber yarns may be arranged in a mesh.

The sheet material in which the reinforcing fiber yarns are arranged in a mesh shape in this manner is a F for preventing the concrete surface from peeling off, which does not mainly have the effect of reinforcing the concrete structure.
It is preferably used for forming an RP layer. In that case, the fiber weight of each layer exceeds 20 g / m ² and 100 g
/ M ² .

If the amount is less than 20 g / m ² , the above-mentioned effect of preventing peeling cannot be obtained. If the amount is more than 100 g / m ² , the strength of the FRP layer to be formed becomes more than necessary, resulting in an increase in cost. It is not preferable. Since the reinforcing fiber yarn is restrained by the stitch yarn, the fiber weight is 20 g /
m ² The small as less than 100 g / m ² greater than, and also arrangement of the reinforcing fiber yarns have meshes, it is possible to ensure the stability of arrangement of the reinforcing fiber yarns.

In this case, if carbon fibers are used as the reinforcing fibers, the carbon fibers are hardly corroded by the alkali component of the concrete and have low water absorption, so that the FRP layer formed has excellent durability. More preferred. Examples of the support material used in the sheet material of the present invention include a synthetic fiber woven fabric made of polypropylene fiber, polyethylene fiber, polyamide fiber, or polyester fiber, a nonwoven fabric made of glass fiber, polyaramid fiber, or the like.
In addition, a mesh-like material in which fiber yarns composed of any of the above-described fibers are arranged biaxially or triaxially, and in each direction, the fiber yarns are separated from each other. And these support materials may further have thin threads arranged in the width direction and / or the oblique direction.

And, even if the support material has a high viscosity, the support material must not inhibit the impregnation of the resin. For this reason, the cover factor of the support material, that is, the planar coverage of the support material by its constituent fibers is preferably about 1 to 50%. For example, a sack cloth is given as such a synthetic fiber woven fabric. Further, since the supporting material does not play a role of reinforcing the FRP layer, the amount of the supporting material is preferably as small as possible, and the weight of the supporting material is preferably about 5 to 30 g / m ² .

The slit is preferably cut in the length direction of the support member, because the drapability of the sheet material formed by the slit can be improved. The stitch yarn is for preventing the disorder of the arrangement of the reinforcing fiber yarns, and basically does not play the reinforcing effect of the formed FRP layer, and its thickness is 50 to 400 decitex. Is preferred. If it is thinner than 50 dtex, the thread breaks at the time of suturing. If it is thicker than 400 dtex, the stitch yarn portion becomes convex in the formed FRP layer, and the surface thereof becomes uneven. A more preferable thickness of the stitch yarn is 70 to 300 dtex.

The material of the stitch yarn can be selected from polyester fiber, nylon fiber, polyaramid fiber, vinylon fiber, glass fiber, carbon fiber and the like. Further, it is preferable that the arrangement interval of the stitch yarns in the sheet material of the present invention is about 2 to 8 mm and the pitch is about 1 to 4 mm. If the arrangement interval or pitch of the stitch yarns is smaller than this range, the reinforcing fiber yarns are strongly restrained by the stitch yarns, and the drape property of the formed sheet material is lost, and it becomes difficult to attach the sheet material to a corner portion.

If the arrangement interval or pitch is made larger than this, the drapability of the sheet material is improved, and deep drawing can be performed. However, the reinforcing fiber yarn is partially restricted within the range constrained by the stitch yarn. It is not preferable because it may bend. More preferably, the stitch yarn arrangement interval is 2 to
5 mm and the pitch is 2 to 3.3 mm. In the sheet material of the present invention, the number of layers contained in the reinforcing fiber portion is not limited to one layer shown in FIG. 1 or two layers shown in FIG. Good.

The arrangement direction of the reinforcing fiber yarns in each layer is not particularly limited except that the length direction of the support material is essential as shown in FIG. As described above, it may be in the width direction of the sheet material,
Also, any angle ± α ° with respect to the length direction, for example, 45 °
° direction. When the reinforcing fiber yarns are arranged in the 45 ° direction in this manner, the concrete structure can be effectively sheared and reinforced by the formed FRP layer.

The concrete structure of the present invention can be manufactured, for example, as follows. First, in a concrete structure which is built by a known method as a base, dirt on a concrete surface to be repaired / reinforced is removed, and irregularities on the surface are corrected with a putty to flatten. Next, an epoxy-based primer is applied to the concrete surface in order to enhance the adhesion between the FRP layer formed and the concrete surface. After the primer has cured to some extent, a resin serving as a matrix of the FRP layer is applied thereon, and the concrete repair / reinforcement sheet material of the present invention is immediately pasted thereon.
Then, the sheet material is impregnated with a resin by impregnating rollers, and at the same time, excess resin accumulated between the concrete surface and the sheet material and air trapped therein are removed. Then, a predetermined amount of resin is further applied, and the resin is cured, thereby completing the concrete structure of the present invention whose surface is repaired and reinforced by the FRP made of the concrete repair / reinforcement sheet material of the present invention. .

In this case, the direction in which the impregnating roller is applied may be the longitudinal direction of the sheet material, and the worker may perform the impregnating roller application in the up-down direction, so that the work is easy. Also, when the sheet material is stuck on the surface of the concrete structure, the reinforcing fiber portion of the sheet material and the concrete surface are opposed to each other, so that during the resin impregnation work, the drop of the reinforcing fiber dust is supported by the sheet material. Workers do not feel tingling with this dust because the material prevents it. In addition, since the impregnating roller does not come into direct contact with the reinforcing fiber yarn, it is possible to prevent the orientation disorder and damage of the reinforcing fiber yarn, and a sufficient strength is secured in the FRP layer formed.

The resin used in the present invention is not particularly limited, but a room temperature-curable epoxy resin, vinyl ester resin, unsaturated polyester resin or the like which is liquid at room temperature is preferably used. Among them, epoxy resins are preferably used because they have good adhesion to reinforcing fibers and concrete.

[0048]

As is apparent from the above description, the sheet material of the present invention and the concrete structure using the same have the following effects. (1) Since the place where the stitch thread penetrates the sheet material becomes a passage for resin or air, even if the basis weight of the reinforcing fiber of the sheet material becomes relatively large, excess resin between the sheet material and the concrete surface is used. Squeezing and degassing of the air entrapped therein can be reliably performed, and the resin impregnation property is also excellent. (2) The drapability of the sheet material can be improved by the arrangement interval and the pitch of the stitch yarns. (3) The stitch yarn suppresses the disorder of the orientation of the reinforcing fiber yarn due to the impregnating roller at the time of resin impregnation, and there is no bending (crimp) of the yarn due to the crossing of the yarns like a woven fabric. Even if a stress acts on the FRP layer formed by use, there is no stress concentration on the reinforcing fiber yarns and the resin as the matrix. Therefore, in the FRP layer, since the properties of the reinforcing fiber are sufficiently exhibited, the FRP layer has a high strength and a high rigidity, whereby the concrete structure can be repaired and reinforced effectively. (4) In combination with the fact that the generation of fluff during production of the sheet material is suppressed and the effects of the above (1) to (3),
The operator can form the FRP layer on the concrete surface to be repaired / reinforced without difficulty, and can manufacture the concrete structure of the present invention. (5) If thick reinforcing fiber yarns are used, the material cost of the sheet material can be suppressed, and thus a concrete repair / reinforcement sheet material and a concrete structure using the same can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic partial perspective view illustrating a concrete repair / reinforcement sheet material according to the present invention.

FIG. 2 is a schematic partial plan view illustrating a concrete repair / reinforcement sheet material according to the present invention.

FIG. 3 is a schematic partial perspective view illustrating another concrete repair / reinforcement sheet material according to the present invention.

FIG. 4 is a schematic partial enlarged sectional view taken along line AA ′ of FIG. 3;

[Explanation of symbols]

1,1 'concrete repair and reinforcement for the sheet material 2 reinforced fiber portion 2a filament _{2x, 2x 1, 2x 2,} 2x 3 ..., 2y, 2y 1, 2y 2.
2y _3, ... reinforcing fiber yarns 2X, 2Y reinforcing fiber yarns 2x, layers 2Y ₁ consisting 2y, 2Y _2, 2Y _3, ... yarn filaments 2a are each stitch 4 _1, 4 _2, 4 _3, is restrained by ... aggregate 3 length of the support member 4,4 _1, 4 _2, 4 _3, ... stitch yarn P gap Q gap g widthwise pitch X support 3 of the arrangement interval p stitch yarn 4 stitch yarn 4 Y support 3 Direction AA 'Reference line of section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // D03D 1/00 D03D 1/00 A 4L048 15/12 15/12 Z D04H 1/45 D04H 1/45 B29K 301: 12 B29K 301: 12 307: 04 307: 04 309: 08 309: 08 F-term (reference) 2E176 AA01 BB29 4F072 AA04 AA07 AB04 AB06 AB09 AB10 AB22 AB29 AB33 AB34 AD23 AD38 AH25 AL17 4F100 AD11A AD11B AG00 AK04AK07 AK42 AK43 AK47 AT00C BA02 BA03 BA07 BA22 DC13C DG07A DG07B DG11C DG15C EC082 GB90 JK01A JK01B JL11 YY00A YY00B 4L002 AA00 AA06 AA07 AB02 CA01 DA00 FA06 4L047 AA10 AABA ABA AAB AA AAB AA AAB AA A13 AA A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A AC09 CA01 DA41 EB00

Claims (11)

[Claims] 1. A reinforcing fiber portion including one or two or more layers in which a plurality of reinforcing fiber yarns are arranged in parallel with each other, and a support member disposed on at least one side of the reinforcing fiber portion In at least one layer of the reinforcing fiber portion, the reinforcing fiber yarns are arranged in the length direction of the support material, and the reinforcing fiber portion and the support material are integrated with a stitch yarn. A sheet material for repairing and reinforcing concrete. 2. The reinforcing fiber portion includes only a layer in which the reinforcing fiber yarns are arranged in the length direction.
The sheet material for repair / reinforcement of concrete described in 1. 3. The concrete repair / reinforcement according to claim 1, wherein the reinforcing fiber portion includes two layers in which the reinforcing fiber yarns are arranged in a length direction and a width direction of the support material, respectively. Sheet material. 4. The fiber weight of the reinforcing fiber yarn in each layer of the reinforcing fiber part is more than 100 g / m ² and 500 g / m ^2.
Concrete repair and reinforcement sheet material according to any one of claims 1 to 3 is less than m ^2. 5. The reinforcing fiber portion, wherein the reinforcing fiber yarns are arranged in a mesh pattern, and the weight of the reinforcing fiber yarns in each layer of the reinforcing fiber portion is 20 g / g.
Concrete repair and reinforcement sheet material according to claim 3 is less than 100 g / m ² exceed m ^2. 6. The method according to claim 1, wherein the support is a nonwoven fabric.
The concrete repair / reinforcement sheet material according to any one of the above. 7. The concrete repair / reinforcement sheet material according to claim 1, wherein the support material is a sack cloth. 8. The method according to claim 1, wherein the reinforcing fibers are carbon fibers.
8. The sheet material for concrete repair / reinforcement according to any one of claims 7 to 7. 9. The reinforced fiber yarn according to JIS L10.
The hooking strength measured according to the method 13 is 0.9
Concrete repair and reinforcement sheet material according to claim 8 is mm ² per 900N or more. 10. The concrete repair / reinforcement sheet material according to claim 1, wherein a slit is cut in a length direction of the support material. 11. A fiber-reinforced plastic comprising the concrete repair / reinforcement sheet material according to claim 1, the surface of which is repaired / reinforced.