JPH1143839A - Woven fabric reinforced in one direction and repairing or reinforcing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a woven fabric reinforced in one direction excellent in dimensional stability and handleability, improved in impregnation of resin in forming a fiber reinforced plastic, formable without causing folds and swellings, capable of being subjected to surface smooth formation. SOLUTION: In a woven fabric in which a great number of reinforcing fiber yarns are arranged in parallel in the warp direction and auxiliary yarns are laid in the weft direction, the characteristic of this woven fabric reinforced in one direction comprises (A) flexural rigidity index of the auxiliary yarn (the modulus of elongation of the yarn × (the diameter of single yarn)<4> ×the number of filaments) is 5×10<-3> to 200×10<-3> Kgf.mm<2> and (B) the ratio the tensile rigidity of the reinforcing fiber yarn 2 in the warp direction to the auxiliary yarn in the weft direction (the modulus of elongation of the yarn ×the yarn cross-sectional area per unit width) is 3-100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced textile substrate used for a fiber-reinforced composite material. More specifically, the present invention relates to a reinforced fabric which is excellent in handleability and surface smoothness when reinforcing a concrete structure or the like with carbon fiber reinforced plastic and exhibits a high reinforcing effect.

[0002]

2. Description of the Related Art As a reinforcing base material of a fiber reinforced composite material,
Fabrics made of high-strength, high-modulus fibers such as inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as aramid fibers and high-strength polyethylene fibers are frequently used.

Generally, fiber-reinforced plastics made of reinforcing fibers have large anisotropy and exhibit high tensile strength and elastic modulus in the direction in which the reinforcing fibers are oriented, but almost no resin is applied in the direction perpendicular to the fibers. There is a disadvantage that only strength is exhibited. On the other hand, there is a merit that effective reinforcement can be achieved by orienting many reinforcing fibers in a necessary direction.

In order to utilize anisotropy, reinforcing fibers are arranged in the warp direction, and effective reinforcement can be achieved by a unidirectional woven fabric using auxiliary yarns in the weft direction.

In this case, the auxiliary yarns in the weft direction are for the purpose of maintaining the arrangement of the warp yarns and do not act at all for reinforcement.
As thin a thread as possible is used.

When the warp yarn composed of reinforcing fibers has a relatively small fineness and a high warp yarn density, the number of intersections with the weft yarn is large, and the binding force of the warp yarn on the warp yarn is increased. And a woven fabric with excellent handleability.

However, even if the warp yarn made of the reinforcing fibers has such a high density that a resin is applied to a very dense woven fabric to form a composite material, the resin is hardly impregnated with the resin and the composite material has many voids. Will be.

In particular, when a reinforcing fabric is stuck on a concrete surface to reinforce it, a high-viscosity resin is used to prevent dripping of the resin and slippage of the fabric base material, so that the resin is more difficult to be impregnated. There is a problem.

Furthermore, when a high-viscosity resin is applied to a base for attaching a fabric base material, and when a woven fabric base material with a clogged appearance is affixed from above, the resin hardly comes off in the thickness direction of the fabric base material. Therefore, there is a problem that the resin accumulates between the application surface and the textile substrate, and the surface after application becomes uneven due to uneven thickness of the resin layer, resulting in a molded surface having poor appearance.

On the other hand, even if the resin has a low viscosity, it is difficult for the resin between the attaching surface and the attached textile substrate to escape to the surface of the textile substrate, and the resin flows downward between the attaching surface and the textile substrate. However, there is a problem that the fluid accumulates at one location and swells at that location.

[0011] In order to solve such a problem, the density of the warp yarns made of reinforcing fibers is made coarse, and a sufficient gap is provided between the warp yarns.
It is conceivable to allow the resin to easily escape from the gap to the surface.

However, when the density of the warp yarns is reduced, the number of intersection points between the warp yarns and the auxiliary weft yarns is reduced and the binding force between the warp yarns and the weft yarns is reduced. It becomes a poorly woven fabric.

When fabrics having such low dimensional stability are laminated and molded, if they are lifted up by hand at the time of lamination, they are largely bent by the weight of the fabric and laminated in a state where reinforcing fibers are arranged in a straight line. There is a very difficult problem to do.

In particular, when a large area such as a vertical surface of concrete is to be reinforced by a unidirectional reinforcing fabric, a resin is applied to the concrete surface, and then, if a non-rigid fabric is applied thereto, wrinkles are formed. Once affixed, it is awkward to handle once it has been adhered to the resin, it takes a very long time to eliminate wrinkles, and it is impossible to completely remove it.

In order to improve the above problem, Japanese Patent Laid-Open No.
6152 proposes a reinforced woven fabric substrate in which a sheet material is attached to a woven fabric.

The reinforcing woven fabric substrate can be stuck without wrinkles at the time of sticking since a paper or the like which is not easily deformed is stuck on the woven fabric surface in advance, but a step of sticking in advance is necessary. Also, after attaching the reinforcing fabric base, it is necessary to peel off the sheet material, so it has weak adhesion,
There is a problem that it is easily peeled off during handling.

As described above, there has hitherto not been a unidirectional reinforcing fabric having excellent dimensional stability and good resin impregnation as a substrate for a fiber-reinforced plastic.

[0018]

The object of the present invention is to provide, in particular, excellent dimensional stability and handleability, good resin impregnation when molding into fiber-reinforced plastic, and without wrinkling or swelling. It is an object of the present invention to provide a unidirectional reinforcing fabric that can be formed and that can perform surface smooth molding.

[0019]

[MEANS FOR SOLVING THE PROBLEMS] In order to solve the above problems, the present invention basically has the following configuration. That is, "a woven fabric in which a plurality of reinforcing fiber yarns are arranged in parallel in the warp direction and auxiliary yarns are arranged in the weft direction, A. Bending stiffness index of auxiliary yarn (tensile elastic modulus of fiber x (single Fiber diameter) ⁴ × number of filaments) is 5 × 10 ^{-3 to} 20
0 × 10 ⁻³ Kgf · mm ² ; Tensile rigidity of warp direction reinforcing fiber yarn and weft direction auxiliary yarn (tensile elastic modulus of fiber x fiber cross-sectional area per unit width)
Is a unidirectional reinforcing fabric having a ratio of 3 to 100. "

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Fibers having high strength and high elastic modulus such as glass fiber, aramid fiber, and carbon fiber are preferable as the reinforcing fiber, and in particular, a thick carbon fiber having 6,000 to 30,000 filaments is preferable. It is suitable. The diameter of the single fiber is preferably 5 to 10 μm.

More preferably, the number of filaments is 12,000 to
It is a carbon fiber consisting of 24,000 fibers.

Carbon fiber is the most preferable among the reinforcing fibers because it has a high strength and a high elastic modulus and a high reinforcing effect can be obtained. Among them, the tensile strength is 300 kgf / mm ² or more and the tensile elastic modulus is 20,000 kgf / mm ^2. It is preferable that the carbon fiber is mm ² or more.

The present invention is also characterized in that a fiber yarn thicker than a reinforcing fiber yarn generally used as a warp yarn is used, and a gap of 0.2 to 2.0 mm is provided between the reinforcing fiber yarns.

When the fabric weight is the same, the warp yarns can be thickened to increase the interval between the warp yarns, and the cross-sectional shape of the warp yarns can be focused to a substantially circular shape, so that the thickness of the fabric increases. It is easy to provide a gap between the warp yarns.

In a one-way woven fabric in which the warp yarns are thick reinforcing fiber yarns, after weaving, the warp yarn cross section is bundled into a substantially circular shape by the heald mail, so that the warp yarn is woven with a gap between the warp yarns. The auxiliary yarn in the direction is thin,
Since the yarn with low bending rigidity is used, the regulating force for the spreading of the warp yarn in the width direction hardly acts.
The warp yarn spreads in the width direction due to the nip pressure of the take-up roller, and the gap between the warp yarns is almost eliminated.

Therefore, in the present invention, the use of a weft-direction auxiliary yarn having a high bending rigidity suppresses the warp yarn from spreading in the width direction and actively provides a gap between the warp yarns.

By using a thick yarn of 300 to 1,500 denier for the auxiliary yarn in the weft direction, not only can a gap be provided between the warp yarns on the fabric surface as described above,
A gap can also be provided in the direction of the weft direction auxiliary yarn.

FIG. 3 is a perspective view of an intersecting portion of the warp yarn and the weft yarn. In the present invention, the gap between the warp yarns indicates the gap (B) when the woven fabric is viewed from the front, but the warp yarn intersects with the weft yarn. In the intersecting portion, a gap (A) corresponding to the thickness of the weft thread is formed in a direction substantially parallel to the weft thread. Therefore, by making the weft thread thick, the resin and the embracing air are sufficiently large. The gap (A) is reliably obtained.

By providing such a gap penetrating in the thickness direction of the woven fabric substrate, the gap serves as a passage for the resin and the embracing air, thereby facilitating resin impregnation.

More specifically, for example, when a resin is applied to a reinforcing surface of a concrete structure, and a woven fabric substrate is stuck thereon and then impregnated with a resin, a normal woven fabric substrate is used to lay a concrete surface and a woven fabric substrate. The resin in between moves only between the concrete surface and the woven fabric substrate, and there is a problem that the resin accumulates at the place where the impregnating roller is stopped, and that portion swells.

If a gap is provided between the warp yarns, the resin escapes from the gap to the surface of the woven fabric substrate, the resin between the concrete surface and the woven fabric substrate becomes thin and uniform, and swelling may occur after pasting. Absent.

Further, air is embraced when the woven fabric substrate is applied after the resin is applied to the application surface, but if a space is provided between the warp yarns, the air can be removed from the space.
Reliable reinforcement can be performed without generating large cavities due to entrapped air.

When the warp yarn is made thicker and the density is made coarser,
Since the number of intersection points between the warp and the weft is reduced, the binding force is naturally reduced and the woven fabric has no rigidity.However, by using the auxiliary yarn having a high bending rigidity in the weft direction, the warp is strengthened at the intersection by the weft. At the same time, the bending stiffness in the width direction of the woven fabric is increased by the high bending stiffness of the weft direction auxiliary yarn itself, so that the woven fabric as a whole is a stiff woven fabric.

As the weft-direction auxiliary yarn, a fiber having high bending rigidity such as glass fiber, aramid fiber, or carbon fiber is preferable, and a glass fiber yarn having a low cost is particularly preferable.

As described above, by using a fiber having high bending rigidity for the auxiliary yarn in the weft direction, even if the density of the warp yarn is low, a high binding force to the reinforcing fiber yarn in the warp direction and a high weft force can be obtained. The high rigidity of the auxiliary yarn in the direction itself imparts rigidity to the woven fabric substrate itself, which can prevent wrinkles from occurring in the attaching operation, and facilitates the attaching operation.

Also, it is usually difficult to uniformly apply the resin to the application surface, and when a conventional soft non-rigid textile base material is applied on a state where the coating unevenness is large, the textile base material is stuck. The woven fabric substrate of the present invention uniformly spreads a resin-rich portion by the stiffness of the woven fabric itself, and the resin layer is applied to the woven fabric substrate. And the surface of the woven fabric substrate is not uneven.

Further, when a conventional textile base material and a high-viscosity resin are used, the resin covers around the reinforcing fiber yarn bundle, traps the air in the yarn bundle, and continues unimpregnated in the reinforcing fiber yarn bundle direction. Parts (voids) occur.

After a while, there is a problem that the unimpregnated portion expands due to the force of the reinforcing fiber bundle to return to the original thickness, and the central portion of the fiber bundle becomes a large cavity along the reinforcing fiber direction. In order to solve such a problem, the reinforcing fiber bundle is provided with rigidity in the weft-direction reinforcing fiber, so that the reinforcing fiber bundle intersects with the rigid weft-direction auxiliary yarn, and the reinforcing fiber bundle is strongly held. This has the effect of preventing the central portion of the bundle from becoming a large cavity.

The bending stiffness index of the auxiliary yarn in the weft direction is preferably 5 × 10 ⁻³ to 200 × 10 ⁻³ Kgf · mm ^{2 in} terms of the tensile modulus of the fiber × (diameter of a single fiber) ⁴ × the number of filaments. 20 × 10 ^{-3 to} 100 × 10 ^-3 Kgf · mm
² is a more preferred range. Here, the diameter of the short fiber and the number of filaments are obtained by reading the average diameter and the number of filaments from an enlarged photograph of the cross section of the yarn solidified with a resin.

In the case where the reinforcing fibers in the vertical direction are thick and have a coarse density in which a gap is provided between the reinforcing fibers, if the bending stiffness index is 5 × 10 ⁻³ Kgf · mm ² or less, the vertical direction is determined. Not only does the restraining force not act on the reinforcing fibers in the horizontal direction, but the auxiliary yarn itself in the horizontal direction has low bending stiffness, so there is no form retention of the woven fabric. Also, there is a problem that the surface after molding is uneven due to the influence of unevenness in thickness of the resin applied to the application surface or the flow of the resin.

On the other hand, if the bending stiffness index of the auxiliary yarn in the weft direction is 200 × 10 ⁻³ Kgf · mm ² or more, a very rigid fabric is obtained, but crimps are formed in the reinforcing fiber yarn in the warp direction. However, there is a problem that the high strength characteristics of the reinforcing fiber cannot be exhibited.

When the weft direction auxiliary yarn is a yarn hardened with a resin, the value calculated by (tensile elastic modulus of the auxiliary yarn × the fourth power of the diameter of the hardened auxiliary yarn) is defined as bending rigidity.

The auxiliary yarn may be twisted or non-twisted. In particular, when the surface of the composite material is required to be smooth, non-twist is preferable.

The ratio of the tensile stiffness (tensile elastic modulus of fiber × fiber cross-sectional area per unit width) of the warp reinforcing yarn and the weft direction auxiliary yarn is preferably 3 to 100, and more preferably 20 to 70. Is more preferred. The ratio here means (tensile rigidity of the reinforcing fiber yarn in the warp direction) / (tensile rigidity of the auxiliary yarn in the weft direction).

That is, in order to achieve the object of the present invention, the tensile stiffness of the auxiliary yarn in the weft direction needs to be changed by the tensile stiffness of the reinforcing fiber yarn in the warp direction.

When the ratio of the tensile stiffness (tensile modulus of elasticity of fiber × fiber cross-sectional area per unit width) of the warp reinforcing yarn and the weft assist yarn is 3 or less, the weft assist yarn is pulled. Since the rigidity of the warp-direction reinforcing fiber yarn is increased relative to the rigidity of the warp-direction reinforcing fiber yarn, and the warp-direction reinforcing fiber yarn is crimped, the strength characteristics of the reinforcing fiber yarn cannot be sufficiently exhibited.

On the other hand, when the ratio is 100 or more, the tensile stiffness of the weft-direction auxiliary yarn becomes too small with respect to the tensile stiffness of the warp-reinforcing fiber yarn, so that the woven fabric cannot be given rigidity. In other words, a gap cannot be provided between the warp-direction reinforcing fiber yarns, and the resin between the base material attaching surface and the woven base material or the embracing air cannot be released in the woven fabric thickness direction, thereby causing swelling. There is.

In the present invention, the density of the reinforcing fiber yarns in the warp direction is set at 1 point in order to easily provide a sufficient gap between the warp yarns.
A coarse density of ~ 5 lines / cm is preferred, of which 2-4 lines / cm
Is more preferable, and the basis weight of the reinforcing fiber yarn in the woven fabric is preferably 150 to 600 g / m ² .

The preferred range of the density of the auxiliary yarn in the weft direction is 0.5 to 5 yarns / cm, more preferably 2 to 3 yarns / cm.
It is.

That is, when the density of the weft yarn is 0.5 yarn / cm or less, the number of intersections between the warp yarn and the weft yarn becomes too small, so that the binding force between the warp yarn and the weft yarn becomes small, and the amount of the weft yarn per unit area of the woven fabric is reduced. There is a problem that the rigidity of the woven fabric itself is insufficient because the number of the woven fabrics decreases.

Further, the yarn width of the warp reinforcing fiber yarn bundle is regulated at the intersection with the weft yarn, and a gap can be provided between the warp yarns. However, when the space between the weft yarns is increased, the warp yarn width is increased between them. There is a problem that a sufficient gap cannot be provided between the warp yarns.

On the other hand, when the weft yarn density is 5 yarns / cm or more, a very stiff fabric is obtained. However, there is a problem that the use amount of the weft yarn increases and the material cost increases. The reinforcing fiber yarn of the warp crimps, and the high strength of the reinforcing fiber cannot be sufficiently exhibited.

The space provided between the warp yarns is preferably in the range of 0.2 to 2.0 mm.

If the gap is 0.2 mm or less, there is a problem that the resin is hard to come out of the gap particularly when the resin is made of a high-viscosity resin.
When the gap is 2.0 mm or more, the resin is easy to come out, but the thickness of the warp yarn part with the gap increases, the fabric surface becomes uneven, and the impregnating property of the resin decreases because the reinforcing fiber yarns are firmly bundled There is a problem to do.

The resin impregnating property is closely related to the sheet air permeability according to the JIS L 1096 method.
It was found that it was preferable to be ~ 300 CC / cm ² / sec.

If the ventilation rate is less than 40 CC / cm ² / sec,
The bulk density of the carbon fibers forming the reinforcing fiber yarn is reduced, that is, the space formed between the carbon fibers is small,
Further, the gap between the reinforcing fiber yarns is small, the impregnation property of the resin is poor, and voids are generated.

Further, at 300 CC / cm ² / sec, since the woven fabric has a large gap between the reinforcing fiber yarns, the thickness of the reinforcing fiber portion increases, the surface becomes uneven, and the reinforcing fiber yarns are firmly bundled. Therefore, there is a problem that the impregnating property of the resin into the reinforcing fiber yarn is reduced.

The measurement of the air permeability was in accordance with the air permeability method A of JIS L 1096 method 6.27.

That is, a 20 cm × 20 cm sheet test piece was attached to a 38.3 cm ² vent hole at one end of the cylinder by a predetermined method, and a tilt type barometer was attached to a water column 1.2 by a rheostat.
The suction fan was adjusted to indicate a pressure of 7 cm, and the amount of air passing through the sheet test piece (CC) was calculated from the pressure indicated by the vertical barometer at that time and the type of air hole used, according to a conversion table attached to the tester. / Cm ² / sec) was determined and the average value of the five measurement results was taken as the ventilation rate.

The sample was left in a room at a temperature of 20 ° C. and a humidity of 65% for 24 hours, and then measured in that atmosphere. In the examples described below, as a ventilation meter,
Fragile type testing machine AP- of Daiei Kagaku Seiki Seisakusho Co., Ltd.
360 was used.

Since the fabric structure of the present invention has a coarse warp and weft density, it has a plain weave structure having a large number of intersecting points or a reinforcing fiber parallel to the warp direction and the warp direction. A non-crimp structure in which yarns and auxiliary yarns in the warp direction are arranged alternately, and the auxiliary yarns in the weft direction form a plain weave structure with the reinforcing fiber yarns and the auxiliary yarns in the warp direction is preferable.

The non-crimp structure referred to here is a woven structure in which the reinforcing fiber yarns in the warp direction are oriented substantially straight without bending (crimp).

Further, the stimulating agent is linearly arranged along the weft-direction auxiliary yarn, and the intersection of the warp-direction reinforcing fiber yarn and the weft-direction auxiliary yarn is adhered, so that the shearing direction of the woven fabric is reduced. This is preferable because it exhibits resistance to the deformation of the woven fabric, makes the woven fabric more form-retaining, and does not disturb the fiber orientation during handling.

The sighting agent may be helically disposed around the weft direction auxiliary yarn.

As the stimulating agent, low melting point polymers such as copolymerized nylon, copolymerized polyester and polyethylene are preferred.

The method of arranging the blinding agent is as follows. When manufacturing the woven fabric, the low-melting polymer yarn is supplied in parallel when the weft-direction auxiliary yarn is supplied, or the low-melting polymer yarn is wrapped around the weft-direction auxiliary yarn in advance. Is covered and supplied to produce a woven fabric, which is heated on a loom or on a separate line to melt the low-melting polymer yarn, so that the intersection of the warp and weft yarns can be bonded.

The unidirectional reinforcing fabric of the present invention can be suitably used for repairing or reinforcing structures. Such structures are not particularly limited, such as bridges, pillars, and tunnels. The material is concrete, metal, stone,
Although not particularly limited, such as plastic and wood,
Concrete is most preferable, and the present invention will be described below by taking a concrete structure as an example.

The present invention provides a method for repairing concrete structures.
A method is also included in which a resin is applied to a portion to be reinforced, the above-described unidirectional reinforcing fabric is adhered from above, and the resin is impregnated with an impregnating roller to reinforce.

The resin used is a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, and a vinyl ester resin.

(Embodiment of the Present Invention) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a weft direction auxiliary yarn made of glass fiber yarn, and reference numeral 2 denotes a warp reinforcing fiber made of carbon fiber, which has a plain weave structure interlaced with each other.

The bending stiffness index (tensile modulus of fiber × (diameter of single fiber) ⁴ × number of filaments) of the weft-direction auxiliary yarn is 5 × 10 ⁻³ to 200 × 10 ⁻³ , and The ratio of the tensile rigidity (tensile modulus of elasticity of fiber × cross-sectional area of fiber per unit width) of the reinforcing fiber yarn in the weft direction and the weft direction auxiliary yarn is 3 to 100.

Further, the stimulating agent 3 is provided around the weft direction auxiliary yarn.
Are spirally arranged, and are bonded at intersections of the weft direction auxiliary yarns and the warp direction reinforcing fiber yarns.

FIG. 2 shows that the warp direction auxiliary yarns 1 are alternately arranged between the warp direction reinforcing fiber yarns 2, and the weft direction auxiliary yarns 1 are combined with the reinforcing fiber yarns 2 and the warp direction auxiliary yarns 4. It is a non-crimp structure having a plain weave structure, and the ratio of the bending stiffness of the weft auxiliary yarn and the ratio of the tensile stiffness of the warp direction reinforcing fiber yarn to the weft direction auxiliary yarn is in the same range as the plain weave structure.

[0075]

【Example】

(Examples 1 to 3, Comparative Examples 1 and 2) In order to clarify the effects of the present invention, unidirectional reinforcing fabrics having a woven structure as shown in FIG. 1 were prepared under the respective conditions shown in Table 1. Table 1 summarizes the results of the study.

[0076]

[Table 1] * 1: Covering low melting point copolymer 100D with a twist number of 150 T / m.

* 2: Flexural rigidity index (tensile modulus of fiber × (diameter of single fiber) ⁴ × number of filaments) [Kgf · m
m ² ] * 3: Ratio of tensile rigidity (tensile elastic modulus of fiber × fiber cross-sectional area per unit width) * 4: Evaluation of rigidity of woven fabric is as follows.

A: Very high rigidity, no wrinkles on the surface.

：: The rigidity is sufficiently high and no wrinkles are generated on the surface.

X: Low rigidity and wrinkles on the surface.

Examples 1 to 3 of the present invention in Table 1
The woven fabric had sufficient rigidity and could be stuck without wrinkles. In addition, the resin could escape from the gaps between the warp yarns and be easily impregnated. In addition, the air embedment at the time of sticking was also released from the gap between the warp yarns, and there was no void caused by the air embrace.

On the other hand, when the bending stiffness index of the weft direction auxiliary yarn is 5 kgf · mm ² or less as in Comparative Example 1, there is a problem that the woven fabric has no rigidity and wrinkles occur when the woven fabric is attached. Also, since the bending stiffness of the weft direction auxiliary yarn is small,
There is no force to control the width of the reinforcing fiber yarn in the warp direction, the yarn width is expanded to the maximum, there is no gap between the yarns, the result is that the ventilation is small, and the resin is applied to the concrete surface. The resin did not easily come out to the surface even after the application and the impregnation with a roller, and the molding surface was uneven due to unevenness in the resin thickness between the application surface and the woven fabric substrate, and the appearance was poor.

In Comparative Example 2, as a result of using a carbon fiber yarn having 6,000 filaments as the weft direction auxiliary yarn, a high bending rigidity and a sufficient gap could be obtained. The warp-direction reinforcing fiber yarn and the weft-direction auxiliary yarn have a small tensile stiffness ratio, so the crimp of the warp-direction reinforcing fiber yarn is large, and the formed surface is uneven due to the thick weft-direction auxiliary yarn. There was a problem.

[0084]

According to the unidirectional reinforcing fabric of the present invention, the bending stiffness of the weft direction auxiliary yarn and the tensile stiffness ratio of the reinforcing fiber yarns in the warp direction and the weft direction auxiliary yarn are specified to increase the warp direction. Using reinforced fiber yarns, sufficient rigidity is imparted to the woven fabric even at a coarse warp yarn density, no wrinkles are generated at the time of pasting at the time of molding, and it is attached due to the high rigidity of the woven fabric The resin thickness unevenness between the surface and the woven fabric substrate can be uniformly extended, and the surface can be finished to be smooth.

Further, for the reinforcing fiber yarn having a large warp direction, a weft having a high bending rigidity provides a sufficient gap between the warp yarns to allow the resin to pass therethrough. It can be pulled out from the surface of the woven fabric, making it possible to reinforce a concrete structure without surface irregularities due to voids and unevenness in resin thickness.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the unidirectional reinforcing fabric of the present invention.

FIG. 2 shows an exemplary embodiment of the unidirectional reinforced fabric of the present invention having warp assist yarns.

FIG. 3 is a perspective view of a crossing portion of a warp yarn and a weft direction auxiliary yarn (A: a gap formed in the vicinity of the auxiliary yarn in a direction parallel to the weft direction auxiliary yarn, B: a gap when the woven fabric is viewed from the front).

[Explanation of symbols]

 1: Weft direction auxiliary yarn 2: Warp direction reinforcing fiber yarn 3: Membrane agent 4: Warp direction auxiliary yarn

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[Procedure amendment]

[Submission date] June 23, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

In order to solve such a problem, it is conceivable to increase the density of the warp yarns made of reinforcing fibers, to provide a sufficient space between the warp yarns, and to allow the resin to easily pass through the space to the surface.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

The bending stiffness index of the weft direction auxiliary yarn is preferably 5 × 10 ⁻³ to 200 × 10 ⁻³ Kgf · mm ^{2 in} terms of the tensile modulus of the fiber × (diameter of a single fiber) ⁴ × the number of filaments. 20 × 10 ^{-3 to} 100 × 10 ^-3 Kgf · mm
² is a more preferred range. Here, the diameter and the number of filaments of a single fiber are obtained by reading the average diameter and the number of filaments from an enlarged photograph of the cross section of the yarn solidified with a resin.

Claims (12)

[Claims] 1. A woven fabric in which a plurality of reinforcing fiber yarns are arranged in parallel in a warp direction and auxiliary yarns are arranged in a weft direction. The bending stiffness index of the auxiliary yarn (tensile modulus of fiber × (diameter of single fiber) ⁴ × number of filaments) is 5 × 10 ^{−3 to} 20
0 × 10 ⁻³ Kgf · mm ² ; Tensile rigidity of warp direction reinforcing fiber yarn and weft direction auxiliary yarn (tensile elastic modulus of fiber x fiber cross-sectional area per unit width)
A unidirectional reinforcing fabric having a ratio of 3 to 100. 2. The unidirectional reinforcing fabric according to claim 1, wherein the reinforcing fibers are made of carbon fibers, and the number of carbon fiber filaments is 6,000 to 30,000. 3. The method of claim 1, wherein the reinforcing fibers are arranged in a warp direction.
The unidirectional reinforcing fabric according to any one of claims 1 to 2, wherein a gap of 2 to 2.0 mm is provided. 4. The unidirectional reinforcing fabric according to claim 1, wherein the weft direction auxiliary yarn is glass fiber. 5. The arrangement density of warp yarns made of reinforcing fibers is 1
The unidirectional reinforcing woven fabric according to any one of claims 1 to 4, wherein the woven fabric has a thickness of from 5 to 5 / cm. 6. The unidirectional reinforced fabric according to claim 1, wherein the woven fabric has a plain weave structure in which one warp-direction reinforcing fiber yarn and one weft-direction auxiliary yarn are alternately crossed. 7. An auxiliary yarn in a warp direction is arranged in parallel with the reinforcing fiber yarns in the warp direction and alternately with the reinforcing fiber yarns in the warp direction. The unidirectional reinforcing fabric according to any one of claims 1 to 5, having a non-crimp structure in which the fiber yarn and the warp direction auxiliary yarn form a plain weave structure. 8. The method according to claim 1, wherein the sieving agent is linearly arranged along the auxiliary yarn in the weft direction, and is bonded at the intersection of the auxiliary yarn and the reinforcing fiber yarn in the warp direction. The unidirectional reinforcing fabric according to any one of the above. 9. The method according to claim 1, wherein the sieving agent is spirally disposed around the auxiliary yarn in the weft direction, and is bonded at the intersection of the auxiliary yarn and the reinforcing fiber yarn in the warp direction. The unidirectional reinforcing fabric according to any one of the above. 10. The carbon fiber weight used in the vertical direction is
In a woven fabric of 150 to 600 g / m ² , JIS L 1096
Unidirectional reinforcing fabric according to any one of claims 1 to 9 sheets aeration of law is 40~300CC / cm ² / sec. 11. A repair / reinforcement method in which a resin is applied to a portion of a structure to be repaired or reinforced, and the unidirectional reinforcing fabric according to any one of claims 1 to 10 is stuck thereon. How to repair or reinforce a featured structure. 12. A repair / reinforcement method in which a resin is applied to a portion of a structure to be repaired or reinforced, and the unidirectional reinforcing fabric according to any one of claims 1 to 10 is stuck thereon. A method for repairing or reinforcing a concrete structure.