JP2002194640A - Reinforcing mesh fabric and method for reinforcing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing mesh fabric for reinforcing both the fire resistance and impact resistance of hydraulic inorganic materials, comprising a combination of carbon fiber bundles with alkali-proof organic fiber bundles. SOLUTION: This reinforcing mesh fabric comprises, as the warps, both carbon fiber bundles and alkali-resistant organic fiber bundles parallel to each other and, as the wefts, the alkali-resistant organic fiber bundles parallel to each other, wherein the respective intersections of the warps and wefts are filled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing mesh fabric exhibiting excellent properties for a fiber-reinforced composite material, and a method of reinforcing a material using the same, and particularly to a hydraulic inorganic material such as gypsum, concrete or mortar. The present invention relates to a reinforcing mesh woven fabric that exhibits excellent impact resistance and fire resistance when used for reinforcement. Specifically, it is used for reinforcement of walls of buildings, reinforcement of block walls, reinforcement of beams and ceilings, reinforcement of floors, and the like.

[0002]

2. Description of the Related Art When reinforcing columns and walls of reinforced concrete or the like, a high carbon fiber sheet in which carbon fibers are densely arranged in one direction or a carbon fiber woven fabric which is densely woven vertically and horizontally is attached with an epoxy resin. A reinforcing effect is obtained,
Used for actual seismic reinforcement work. However, when embedded in a hydraulic inorganic material such as concrete or mortar and used as a substitute for reinforcing steel, the fibers are densely arranged in these carbon fiber sheets and woven fabrics,
The hydraulic inorganic material which is a matrix cannot be impregnated well.

[0003] Therefore, it is necessary to form a mesh having a coarse mesh so that the hydraulic inorganic material containing sand and gravel can wrap around well and enclose the fibers. A mesh-like woven fabric made of carbon fibers has been proposed. A method for producing a hydraulic inorganic material having excellent fire resistance has been proposed, for example, a reinforcing mesh fabric comprising carbon fiber yarns in which warp and weft yarns are flat and have substantially no twist has been proposed (Japanese Patent Laid-Open No. 7-1995). 24
No. 3150), however, carbon fibers are hydrophobic and have poor adhesion to hydraulic inorganic materials. Therefore, when embedded alone with fibers, peeling occurs prior to fiber breakage, and the carbon fibers have High strength and high elastic modulus could not be developed. Therefore, a method of improving the adhesiveness with a hydraulic inorganic material by coating a carbon fiber mesh fabric with an epoxy resin or a copolymer latex has been proposed (for example, Japanese Patent Publication No. 4-55139, 63-111
No. 045).

[0004] Even in the case described above, the bending strength was improved by improving the adhesion between the carbon fiber mesh fabric and the hydraulic inorganic material. However, as a result of examining the impact resistance, when the shear strength of the carbon fiber is low, if a crack occurs inside the hydraulic inorganic material due to the impact, a high shear force is generated in the cracked portion, and the carbon fiber is easily cut and the crack is generated. However, there is a problem that high impact strength cannot be obtained due to the extension of

[0005]

SUMMARY OF THE INVENTION The present invention relates to a mesh fabric for reinforcing a hydraulic inorganic material such as gypsum, concrete or mortar. The mesh fabric for reinforcement provides high impact resistance and fire resistance. The purpose of the present invention is to provide a used material reinforcing method.

[0006]

When a mesh-like carbon fiber woven fabric is embedded in a hydraulic inorganic material or bonded to the surface of a hydraulic inorganic material with an epoxy resin or the like, the carbon fiber is weak to shearing, and thus cracks due to impact. When cracks occur, they are easily cut along cracks. Then, it was found that by forming a composite of organic fibers and carbon fibers resistant to shearing, the extension of cracks was suppressed at the organic fibers, and the strength of the mesh fabric could be maintained. Therefore, the above problem is solved by using a carbon fiber bundle having excellent tensile strength and fire resistance and an organic fiber bundle having high shear strength and excellent impact resistance.

That is, the present invention provides the following (1) to (6)
It is. (1) A reinforcing mesh woven fabric in which warp yarns are composed of parallel carbon fiber bundles and alkali-resistant organic fiber bundles, and the intersections of the warp yarns and the weft yarns are sealed. (2) The reinforcing mesh woven fabric according to (1), wherein the weft is composed of only alkali-resistant organic fiber bundles parallel to each other. (3) The alkali-resistant organic fiber bundle constituting the weft contains hot-melt fibers, and the hot-melt fibers are melted by heat treatment to bond the intersections of the meshes, wherein (1) or (2) is described. Mesh fabric for reinforcement. (4) The ratio of the carbon fiber bundle and the alkali-resistant organic fiber bundle constituting the warp is 1: 5 to 5: 1, and the ratio of the carbon fiber bundle and the alkali-resistant organic fiber bundle constituting the weft is 1: 5.
The reinforcing mesh woven fabric according to any one of (1) to (3), wherein the ratio is る こ と 5: 1. (5) The reinforcing mesh fabric according to any one of (1) to (4), wherein the alkali-resistant organic fiber bundle is a vinylon fiber bundle. (6) A resin is applied to the surface of the structure or the structure material, and then the reinforcing mesh fabric according to any one of (1) to (5) is laminated, and the mesh fabric is impregnated with the resin. A method for reinforcing a structure or a structure material, characterized by curing the material. (7) A method for reinforcing a hydraulic inorganic material, comprising embedding the reinforcing mesh fabric according to any one of (1) to (5) in a hydraulic inorganic material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. FIG. 1 is a schematic view showing an example of the reinforcing mesh fabric of the present invention.
The warp is alternately composed of mutually parallel carbon fiber bundles 1a and alkali-resistant organic fiber bundles 1b, and similarly, the weft is composed of mutually parallel alkali-resistant organic fiber bundles 2b, and the warp and weft form a mesh. .
The hot melt fiber 2c is woven into the weft, and the intersection 3 of the warp and the weft is stopped by the hot melt fiber 2c.

FIG. 2 is a schematic view showing another example of the reinforcing mesh fabric of the present invention. The warp is composed of a carbon fiber bundle, an alkali-resistant organic fiber bundle, and an alkali-resistant organic fiber bundle in the order of the carbon fiber bundle 1a and the alkali-resistant organic fiber bundle 1b, which are parallel to each other. 2b, and the warp and the weft form a mesh. The hot melt fiber 2c is woven into the weft, and the hot melt fiber 2c
Thereby, the intersection 3 of the warp and the weft is stopped.

The carbon fiber bundle which is a component of the reinforcing mesh fabric of the present invention will be described. In the reinforcing mesh fabric of the present invention, a carbon fiber bundle is used as the reinforcing fiber. Carbon fibers are excellent in heat resistance and fire resistance, do not absorb water, and are not affected by alkali. Therefore, even when used embedded in cement,
The carbon fiber does not deteriorate and can exert a reinforcing effect for many years.

The carbon fiber used has a tensile strength of 200 to 800 kgf / mm ² and a tensile modulus of 5 to 9
Those having 0 tf / mm ² are preferable. The number of filaments of the carbon fiber bundle is 6,000 to 48,000, and the fineness is 2.0.
It is preferably from 100 to 30,000 denier. The carbon fiber is not limited to, for example, pitch type, PAN type, and the like.

In the reinforcing mesh fabric of the present invention,
An alkali-resistant organic fiber bundle is used together with the carbon fiber bundle. Even if embedded in concrete or mortar as an alkali-resistant organic fiber bundle, it exhibits the desired performance for a long time,
It is not particularly limited as long as it is an organic fiber having a high elongation and a high shear strength, and for example, vinylon fiber, acrylic fiber, Kevlar fiber, and the like are preferable, and in particular, acrylic fiber and vinylon fiber are hydrophilic and hydraulic inorganic materials. And good compatibility. As the alkali-resistant organic fiber bundle, split fibers such as those used for wari can be used, but usually a multifilament yarn is used.

These alkali-resistant organic fiber bundles can improve the adhesiveness of the mesh fabric and sufficiently exhibit the strength and rigidity of the mesh fabric itself. The alkali-resistant organic fiber bundle has 200 to 10,000 filaments,
Fineness is 1,000 to 20,000 denier.

As the warp or weft of the present invention, a multifilament reinforcing fiber can be used, and a multifilament yarn having a non-spread circular cross section and a flat multifilament reinforcing fiber can be used. Is preferred.

[0015] The "flat reinforcing fiber multifilament yarn" can be obtained, for example, by subjecting a non-twisted yarn to a fiber opening process. Width / yarn thickness ratio is 30 ~
One that is 100 can be used.

If the warp or weft in the mesh fabric is flat, a large bonding area can be secured at the intersection between the warp and the weft, and a mesh fabric having a strong adhesive strength at the intersection can be obtained.

As described above, by increasing the adhesive strength between the warp and the weft, a mesh fabric having a high shear strength and a high shear rigidity can be obtained. Therefore, when the planar cement material is reinforced, the shear rigidity of the face plate is increased, and at the same time, the bending rigidity and the bending strength can be increased.

In the reinforcing mesh fabric of the present invention,
Usually, a carbon fiber bundle and an alkali-resistant organic fiber bundle having substantially no twist as a warp yarn can be used as a reinforcing fiber multifilament yarn. As the reinforcing fiber multifilament yarn having substantially no twist, a reinforcing fiber multifilament yarn having a circular cross section which is not opened and a flat reinforcing fiber multifilament yarn can be used, and the latter is preferable.

In the reinforcing mesh fabric of the present invention, a carbon fiber bundle having a twist as a warp and an alkali-resistant organic fiber bundle can also be used as a reinforcing fiber multifilament yarn. Further, a reinforcing fiber multifilament yarn having substantially no twist and a reinforcing fiber multifilament yarn having twist may be used in combination.

For example, a method of using a substantially non-twisted carbon fiber bundle and a twisted alkali-resistant organic fiber bundle as a reinforcing fiber multifilament yarn for warp, a method of twisting a substantially non-twisted alkali-resistant organic fiber bundle and a twist. A method of using a carbon fiber bundle as a reinforcing fiber multifilament yarn for warp, and the like can be given.

In the reinforcing mesh fabric of the present invention,
As the weft, an alkali-resistant organic fiber bundle can be used as a reinforcing fiber multifilament yarn.

In the reinforcing mesh fabric of the present invention,
Usually, an alkali-resistant organic fiber bundle having substantially no twist as the weft can be used as the reinforcing fiber multifilament yarn. As the reinforcing fiber multifilament yarn having substantially no twist, a reinforcing fiber multifilament yarn having a circular cross section which is not opened and a flat reinforcing fiber multifilament yarn can be used, and the latter is preferable.

In the reinforcing mesh fabric of the present invention, an alkali-resistant organic fiber bundle having a twist as a weft can also be used as a reinforcing fiber multifilament yarn. Further, a reinforcing fiber multifilament yarn having substantially no twist and a reinforcing fiber multifilament yarn having twist may be used in combination.

Examples of the combination method include a method of using a substantially twist-free alkali-resistant organic fiber bundle and a twisted alkali-resistant organic fiber bundle as a reinforcing fiber multifilament yarn for weft, and a method of twisting a substantially twist-free alkali-resistant organic fiber bundle with a twist. A method of using an alkali-resistant organic fiber bundle having the following as a reinforcing fiber multifilament yarn for weft.

In the present invention, "substantially no twist" refers to a state in which there is no twist of one or more turns per 1 m of yarn length.
That is, it means a substantially untwisted state.

When the warp or weft of the present invention is twisted, the number of turns is preferably 5 to 1000 turns, preferably about 10 to 100 turns per 1 m of the yarn length, and a flat reinforcing fiber multifilament yarn is preferably used. When the woven yarn is twisted, the yarn radiation is narrowed, bundled and thickened, and irregularities can be formed on the surface of the woven fabric, and an anchor effect with a hydraulic substance as a matrix can be expected. Twisting more than this is not preferable because the flatness of the fiber is lost and the fiber has a circular cross section, and the bonding area decreases.
In addition, the twisted yarn bundle may be twisted together.

Although the woven structure of the mesh fabric of the present invention can be woven into various forms, it is generally plain weave.
Twill weave, satin weave, rice bran weave, tangled weave and the like may be used.
Plain weave is preferred because it secures a large number of intersections where the warp and weft yarns are adhered, eliminates differences in texture between the front and back sides, and provides a uniform woven fabric with no warpage or the like.

In each type of fabric, the fabric thickness is 0.1
0.4 mm, it is preferred that the fabric basis weight is 30 to 200 g / m ^2. In the reinforcing mesh fabric according to the present invention, the size of the void formed by the warp and the weft is in the range of 5 to 300 mm in both length and width. Even if mortar or concrete containing aggregates such as sand or gravel is cast into such a coarse mesh fabric by pouring, the voids of the mesh fabric do not clog the aggregates and are opposite to the pouring side. The mortar or concrete is uniformly filled on the side, and voids do not remain, so that a uniformly composited hydraulic inorganic material having a smooth surface can be obtained.

In the reinforcing mesh fabric of the present invention,
The carbon fiber bundle and the alkali-resistant organic fiber bundle are used in combination as the warp yarns, and the ratio of the number of the carbon fiber bundle and the alkali-resistant organic fiber bundle is 1: 5 to 5: 1, preferably 1: 3 to
Preferably it is 3: 1. If the ratio of the carbon fiber bundle is less than this, sufficient strength and fire resistance are not exhibited, and if the ratio of the alkali-resistant organic fiber bundle is less than this, the effect of suppressing the extension of cracks generated in concrete is insufficient, Impact resistance decreases.

In the reinforcing mesh fabric of the present invention,
It is preferable that the seal is provided at the intersection of the warp and the weft.

If the sealing is not performed, force is applied separately to the carbon fiber bundle and the organic fiber bundle when an impact is applied, and only the carbon fiber bundle having poor adhesion to the hydraulic inorganic material may be peeled off. There is. By performing the filling, it is possible to receive an impact on the entire mesh fabric, suppress the extension of peeling, and express the original strength of the mesh fabric.

As the filling method, various methods can be used, and a method in which the hot melt fiber is included in or attached to the warp and / or the weft, and the hot melt fiber is melted by heat treatment and bonded. It is desirable in terms of productivity and cost.

Further, the warp yarn and / or the weft yarn may be impregnated or adhered with a hot melt resin and adhered by heating.

In the present invention, the intersection of the warp and the weft is filled, for example, by weaving into a mesh fabric, and then heating the fabric with a hot roll, hot press, or the like on a loom or thereafter, and then forming the hot melt fiber. Is melted to bond the warp and the weft.

As the hot melt fiber serving as a filler, a low melting point polymer such as a low melting point nylon polymer,
Low melting point polyester polymer, nylon polymer, polyester polymer, polyethylene polymer, polypropylene polymer vinyl acetate resin, ethylene vinyl acetate, vinyl chloride, acrylate, polyvinylidene chloride,
Polyethylene, polypropylene, polyethylene-polypropylene copolymer and the like can be used. Among them, a low-melting-point nylon polymer made of a copolymerized nylon has a large adhesive force, so that the purpose can be achieved with a small amount.

Examples of the hot melt resin serving as a filler include vinyl chloride resin, vinyl acetate resin, ethylene vinyl acetate resin, acrylate resin, low melting point nylon,
Low melting point polyester, polyethylene, polyvinylidene chloride, polypropylene, nylon copolymer and the like can be used, and can be impregnated and attached to weft yarn by melting, latex, emulsion, solification, and the like.

The amount of the hot-melt fiber or hot-melt resin used as the filler is about 1 to 50 g / m ² , but the smaller the amount, the better, as long as the purpose of the filler is properly achieved.

The apparatus for producing the mesh fabric of the present invention comprises:
Heat-fusing the woven fabric from the loom body and adding it to the weft yarn by heating the woven fabric from the loom body into a coarse plain weave structure of a warp yarn made of untwisted multifilament carbon fiber and a weft yarn helically entangled with hot melt fibers. And a heat treatment device for melting the hot melt fibers and heat-fusing each intersection of the warp and the weft. Hot melt fibers may be entangled with the warp yarn in addition to the weft yarn.

It is preferable that the weft of the loom be inserted into the weft so that the warp and the weft are not bent or damaged so that the warp is not in contact with the warp. Further, as the weft insertion method, a rapier method such as a band rapier or a rod rapier is particularly suitable.

The heating apparatus can use any heating method as long as it can melt the hot-melt fiber and heat-bond the intersections of the warp and weft, but generally, a non-contact type using hot air or the like can be used. The indirect heating method is inferior to the contact type direct heating method using a heating roller or the like. This is because in the indirect heating method, it is difficult to make the temperature distribution of the woven fabric sufficiently uniform, and the molten resin often flows away from the intersection. As a direct heating method,
For example, there is a method in which a pair of heating rollers that contact and heat the front and back surfaces of the woven fabric are provided, and the heating roller is a pressing roller that sandwiches the woven fabric. If the heating roller is a pressing roller, the surface of the product can be finished beautifully and the loss of the molten resin can be further reduced.

The hot-melt fibers (low-melting polymer) for filling are spirally wound around the carbon fibers forming the warp yarns. It can be supplied during weaving by a known method in the form, and if it adheres in a dot-like manner, it can be arranged in a dot-like manner in a reinforcing fiber multifilament yarn in advance.

When the hot melt fiber is spirally wound, it has excellent integrity as warp and weft, and can stabilize the opening operation and weft insertion operation. The productivity of each weft preparation process can be increased. In general, the latter plying process has much higher productivity than the former covering process.

The number of turns of the hot melt fiber can be appropriately selected, but is usually 10 to 1200 turns / meter, preferably 20 to 1000 turns / meter.

If the hot melt fiber is added and the sizing process is performed, the carbon fiber and the hot melt fiber can be solidified integrally via the glue. Can be prevented.

In the reinforcing mesh fabric of the present invention, auxiliary yarns can be used in addition to warp yarns composed of carbon fiber bundles and alkali-resistant organic fiber bundles and weft yarns composed of alkali-resistant organic fiber bundles. The auxiliary yarn may be used in combination with the hot-melt fiber, or may be used also as the hot-melt fiber.

As the auxiliary yarn, for example, the warp yarn and the weft yarn form a mesh structure, and the auxiliary yarn extending in the warp direction while being wound around the warp in one direction diagonally crosses the weft yarn at the intersection of the warp yarn and the weft yarn. While a weft yarn is integrated with a warp yarn, a twist structure, a unidirectional winding structure, a entangled weave structure, or the like can be adopted.

In the auxiliary yarn, a plurality of rotating disks having two yarn path holes are arranged in front of the reed at positions opposed to the center of rotation, and a reinforcing fiber yarn is provided in one of the path holes of each rotating disk. The warp thread, the auxiliary thread is inserted into the other thread path hole, respectively, and by rotating the plurality of rotating disks, the warp thread and the auxiliary thread are rocked up and down to open the space therebetween, and the opening is It can be manufactured by inserting a weft made of reinforcing fiber yarn behind the reed.

The mesh fabric of the present invention is used not only alone, but also as a warp yarn, a weft yarn, and an auxiliary yarn, which are made of vinyl chloride resin, vinyl acetate resin, acrylate resin, ethylene vinyl acetate resin, nylon resin. Thermoplastic resins such as polyester resins, polyether ether ketone resins, polybutylene terephthalate resins, polyphenylene sulfide resins, bismaleimide resins, and thermosetting resins such as epoxy resins, unsaturated polyester resins, polyimide resins, and phenol resins. The hardening agent may be covered and impregnated, and a cured product may be used, or a prepreg impregnated with the above resin may be prepared and attached to a structure. The impregnation method is easy if it is a liquid, sol, emulsion or latex.

Further, a hardened material obtained by coating, impregnating, and hardening a hydraulic inorganic material such as cement paste as a hardening agent may be used. If cured, the fiber can be installed in a straight state, so high-precision reinforcement can be expected.

The amount of the hardening agent is preferably 5 to 70% by weight, more preferably 5 to 45% by weight, based on the reinforcing mesh fabric of the present invention.
% By weight. Furthermore, the reinforcing mesh fabric of the present invention can cover a carbon fiber bundle and / or an alkali-resistant organic fiber bundle or have a fluff structure in order to improve the adhesion to concrete.

The reinforcing mesh fabric of the present invention can be attached to or embedded in a structure or a structure material to reinforce the structure. Particularly, it is suitably used for reinforcing hydraulic inorganic materials such as gypsum, concrete and mortar. Specifically, it is used for reinforcement of walls of buildings, reinforcement of block walls, reinforcement of beams and ceilings, reinforcement of floors, and the like.
Here, the reinforcement includes prevention of collapse, prevention of crack expansion, bending reinforcement, prevention of mortar falling, improvement of impact resistance, and the like.

When the reinforcing mesh fabric of the present invention is embedded in a structural material, preferably a hydraulic inorganic material, for example, after cement is poured into a mold, the reinforcing mesh fabric may be embedded in the surface and cured. Then, the cement may be poured into the formwork, and the cement mesh fabric may be further poured after the reinforcing mesh fabric is placed on the surface. May be buried.

When attaching to a structure or a structure material, the following operation can be performed. If a base treatment is required, the structure may be polished, washed, putty-coated, etc., and then a primer may be applied with a brush or the like. And
Apply a thermosetting or room temperature curable matrix resin, attach a reinforcing mesh fabric, impregnate the resin with a roller or rubber spatula, and squeeze the resin.If necessary, overcoat the matrix resin to cure the resin. Let it.
In order to obtain a high reinforcing effect, the application of the matrix resin and the lamination of the reinforcing mesh fabric may be repeated several times. After the resin is cured, a protective layer can be formed by applying a weather-resistant paint such as a urethane resin or a fluororesin. The matrix resin has a thixotropic coefficient of 1 to 1.
8, and a resin having a viscosity of 10 to 500 poise is preferably used. An unsaturated polyester resin, a phenol resin, an epoxy resin, or the like can be used, and a room temperature curable epoxy resin is usually used.

[0054]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. A mortar board reinforced by embedding a mesh fabric was prepared, and subjected to an impact test and a fire resistance test. The test method is as follows.

(Preparation of Mortar Board) Portland cement and standard sand were mixed at a weight ratio of 1: 2, and water / water was mixed.
Water was added so that the cement ratio became 0.65, and the mixture was kneaded for 3 minutes. After pouring this into a mold, the above-mentioned mesh fabric is embedded in the surface and cured for one week, and the thickness is 15 mm.
A mortar board was obtained in which the mesh fabric was embedded at a depth of about 0.5 to 1 mm from the bottom of the board.

(Impact Test) A mortar board aged for one week was cut into 32 × 32 cm and subjected to an impact test. The test conforms to the bending and impact test method for building boards of JIS A1408-1995, and is placed horizontally on the opposite side simple support device with a span of 30 cm so that the surface reinforced with the mesh fabric is facing down, and a 500 g spherical weight is used. Was made to collide from a height of 50 cm, and a destruction state was observed. The results were as follows: ：: no cracks occurred, ：: cracks were observed only on the back surface,
X: Cracking is observed from the front surface to the back surface, 3
Shown in stages.

(Fire Resistance Test) A mortar plate dried for two months was cut into 90 × 90 cm and subjected to a fire resistance test. The test is based on JIS A1304-1994 fire resistance test method for building structure and heating class is 1 hour heating (925 ℃)
And The presence or absence of cracks penetrating from the front surface to the back surface during heating was observed, and the results were shown in two stages: ○: no cracks occurred, ×: cracks occurred.

(Example 1) PAN-based carbon fiber manufactured by Toray Industries, Inc. (T700S-12K, 7200 denier, 1200
0 filament) and Kuraray Co., Ltd. vinylon fiber (4
000 denier, 800 filaments) were used for the warp, and only the Kuraray vinylon fiber (400 denier, 800 filaments) was used for the weft. The warp was not twisted, and a low melting point nylon (4 pieces of 300 denier) was spirally wound and added to the weft as a hot melt fiber. As shown in FIG. 1, carbon fibers and vinylon fibers are alternately arranged in a warp so that the ratio of the number of carbon fiber bundles to vinylon fiber bundles becomes 1: 1. A plain woven mesh of fibers and vinylon fibers was prepared. The weft of the mixed mesh was twisted at 50 T / m, and the hot melt fiber was melted by further heat treatment to bond the intersection of the warp and the weft. The test results of the mortar board reinforced with this woven fabric are as shown in Table 1.

(Example 2) The same carbon fiber (T700-12K) manufactured by Toray Industries, Ltd. and vinylon fiber (4000 denier, 800 filament) manufactured by Kuraray as in Example 1 were used for the warp, and the hot melt fiber was used for the weft. As shown in FIG. 2, carbon fibers, vinylon fibers, and carbon fibers are wound around the warp so that the ratio of the number of carbon fiber bundles to vinylon fiber bundles is 1: 2.
The vinylon fibers are arranged in this order, and a plain weave mixed mesh of carbon fibers and vinylon fibers having a fiber pitch of 10 × 10 mm and a twist of 50 T / m applied to the weft yarn and bonded at the intersection is produced in the same manner as in Example 1. did. The test results of the mortar board reinforced with this woven fabric are as shown in Table 1.

(Comparative Example 1) A carbon fiber trading card T700S-12K manufactured by Toray Industries, Inc. was used for the warp and the weft, and woven into a coarse plain weave structure to prepare a mesh fabric having a fiber pitch of 10 × 10 mm. In addition, low melting point nylon (4 pieces of 300 denier) was helically wound and added as a hot melt fiber to the weft, and after weaving, heat treatment was performed to bond the intersection of the warp and the weft. The test results of the mortar board reinforced with this woven fabric are as shown in Table 1.

(Comparative Example 2) Kuraray vinylon fiber (40
00 denier, 800 filaments) for the warp and weft and woven into a coarse plain weave design with a fiber pitch of 10 ×
A 10 mm mesh fabric was produced. In addition, nylon (300 denier 4
This was wound spirally and added, and after weaving, heat treatment was performed to bond the intersections of the warp and the weft. The test results of the mortar board reinforced with this woven fabric are as shown in Table 1.

[0062]

[Table 1]

Next, an impact test was performed on a case where the mesh woven fabric was bonded to the back surface of the mortar plate with an epoxy resin and reinforced. The mortar plate was prepared in the same manner as in Example 1 described above, and a non-reinforced plate having a thickness of 15 mm was prepared without embedding a mesh fabric.

(Adhesion of Mesh Fabric) A mortar board aged for one week was cut into a size of 32 × 32 cm, and the mesh fabric was adhered with an epoxy resin. As the epoxy resin, a cold-setting epoxy resin (E2500) manufactured by Konishi Co., Ltd. was used. The resin was applied to a mortar plate at a rate of 150 g / m ² as an undercoat, and then a mesh fabric was placed thereon, and 150 g / m as an overcoat. ^The resin was applied at a rate of ² . Thereafter, the fiber was impregnated with a resin by an impregnating roller and cured for one week.

(Impact test) As in the above impact test, J
According to the bending and impact test method for architectural boards of IS A1408-1995, it is placed horizontally on a simple support device with a span of 30 cm so that the surface reinforced with a mesh fabric is facing down, and a 500 g spherical weight is placed in a width of 100 cm. And the state of destruction was observed. The results were as follows: ：: no cracks occurred, ：: cracks were observed only on the back surface,
X: Cracking is observed from the front surface to the back surface, 3
Shown in stages. Further, the cut state of the fiber was also observed.

(Example 3) The mesh fabric used in Example 1 was bonded to a mortar plate with an epoxy resin and subjected to an impact test. As a result, as shown in Table 2, a part of the carbon fiber was found to be cracked. Although cut, the cracks did not extend and the mortar plate did not crack.

Comparative Example 3 A mesh woven fabric made of only carbon fibers was produced in the same manner as in Comparative Example 1. However, the fiber pitch was set to 20 × 20 mm in order to use the same amount of carbon fiber per unit area as in Example 3. This mesh fabric,
The mortar plate was adhered to the mortar plate with an epoxy resin and subjected to an impact test. As a result, as shown in Table 2, the carbon fiber was cut by the shearing of the cracked portion and the crack was extended, so that the mortar plate was broken.

Example 4 The same carbon fiber (T700-12K) manufactured by Toray Industries, Ltd. and vinylon fiber (4000 denier, 800 filament) manufactured by Kuraray Co., Ltd. were used for the warp yarn, and the hot melt fiber was used for the weft yarn. Was wound, and carbon fibers, carbon fibers, and vinylon fibers were arranged in this order on the warp so that the ratio of the number of carbon fiber bundles to vinylon fiber bundles was 2: 1. That is, the arrangement of the carbon fibers and the organic fibers in the warp of FIG. 2 was reversed. Then, in the same manner as in Example 1, a plain weave mixed-woven mesh of carbon fibers and vinylon fibers having a fiber pitch of 10 × 10 mm and a weft twisted at 50 T / m and bonded at the intersections was produced. As shown in Table 2, no cracks were observed in the test results of the mortar board reinforced with this woven fabric.

[0069]

[Table 2]

[0070]

The reinforcing mesh woven fabric of the present invention is a mixture of carbon fibers and alkali-resistant organic fibers. The use of carbon fibers can improve the fire resistance and can provide a high shear strength. By using alkaline organic fibers, it is possible to suppress the extension of cracks generated in hydraulic inorganic materials and improve the impact resistance, prevent collapse of building structures, prevent cracks from spreading, bending reinforcement, drop of mortar Prevention and improvement of impact resistance.
Further, since the intersection is fixed by the hot melt fiber, the reinforcing effect is increased.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a reinforcing mesh fabric of the present invention.

FIG. 2 is a schematic view showing another example of the reinforcing mesh fabric of the present invention.

[Explanation of symbols]

1a: carbon fiber bundle, 1b: alkali-resistant organic fiber bundle, 2
b: alkali-resistant organic fiber bundle, 2c: hot melt fiber, 3: intersection.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // D03D 15/00 D03D 15/00 GCF Term (Reference) 4L048 AA05 AA18 AA24 AA42 AA44 AB07 AB13 AB17 AC00 AC18 BA01 BA02 BA06 CA00 CA01 CA15 DA41 EB05

Claims (7)

[Claims] 1. A reinforcing mesh fabric in which a warp is composed of a carbon fiber bundle and an alkali-resistant organic fiber bundle which are parallel to each other, and the intersection of the warp and the weft is stopped. 2. The reinforcing mesh fabric according to claim 1, wherein the weft yarns are composed of only alkali-resistant organic fiber bundles parallel to each other. 3. The method according to claim 1, wherein the alkali-resistant organic fiber bundle constituting the weft contains hot-melt fiber, and the hot-melt fiber is melted by a heat treatment to seal the intersection of the mesh. The mesh fabric for reinforcement according to the above. 4. The reinforcing mesh fabric according to claim 1, wherein the ratio of the carbon fiber bundle and the alkali-resistant organic fiber bundle constituting the warp is 1: 5 to 5: 1. . 5. The reinforcing mesh fabric according to claim 1, wherein the alkali-resistant organic fiber bundle is a vinylon fiber bundle. 6. A resin is applied to the surface of a structure or a structure material, and then the reinforcing mesh fabric according to claim 1 is laminated, and the mesh fabric is impregnated with the resin. A method of reinforcing a structure or a structure material, characterized by curing the material. 7. A method for reinforcing a hydraulic inorganic material, comprising embedding the reinforcing mesh fabric according to any one of claims 1 to 5 in a hydraulic inorganic material.