JP3286270B2 - Reinforcement mesh fabric and method of material reinforcement - Google Patents

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) The warp is composed of a mutually parallel carbon fiber bundle and an alkali-resistant organic fiber bundle, and the weft is composed of a mutually parallel carbon fiber bundle and an alkali-resistant organic fiber bundle, and the intersection of the warp and the weft is stopped. Mesh fabric for reinforcement. (2) The carbon fiber bundle and the alkali-resistant organic fiber bundle constituting the weft include a hot melt fiber, and the hot melt fiber is melted by a heat treatment, and a crossing portion of the mesh is adhered. Mesh fabric for reinforcement. (3) 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 fabric according to (1) or (2), wherein the ratio is up to 5: 1. (4) The reinforcing mesh fabric according to any one of (1) to (3), wherein the alkali-resistant organic fiber bundle is a vinylon fiber bundle. (5) 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 (4) 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. (6) A method for reinforcing a hydraulic inorganic material, comprising embedding the reinforcing mesh fabric according to any one of (1) to (4) 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. Similarly, the weft is alternately composed of mutually parallel carbon fiber bundles 2a and alkali-resistant organic fiber bundles 2b. The mesh is made by. 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 1a and an alkali-resistant organic fiber bundle 1b, which are parallel to each other, and a carbon fiber bundle, an alkali-resistant organic fiber bundle, and an alkali-resistant organic fiber bundle in this order.
a and the alkali-resistant organic fiber bundle 2b
The bundle is composed of an alkali-resistant organic fiber bundle and an alkali-resistant organic fiber bundle in this order, 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.

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 fibers are not limited, for example, pitch-based, PAN-based, 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, a carbon fiber bundle and 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, a carbon fiber bundle and an alkali-resistant organic fiber bundle having substantially no twist 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 weft 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 weft, a method of twisting with a substantially non-twisted alkali-resistant organic fiber bundle. A method in which a carbon fiber bundle is used as a reinforcing fiber multifilament yarn for a weft yarn, or the like, may be used.

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 twisting the warp or weft yarn of the present invention, it is preferable to use about 10 to 100 turns per 1 m of yarn length, and it is preferable to use a flat reinforcing fiber multifilament yarn. 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.
A braided cloth, a warif, or the like, which is a nonwoven fabric that is entangled or laminated in a cross-girder shape, 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 casting, the aggregates do not clog in the voids of the mesh fabric 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 and the weft, and the ratio of the numbers of the carbon fiber bundle and the alkali-resistant organic fiber bundle is 1: 1 for the warp and the weft respectively.
It is preferably from 5 to 5: 1, preferably from 1: 3 to 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.

The ratio of the number of the warp carbon fiber bundle to the weft carbon fiber bundle per unit area in the reinforcing mesh fabric of the present invention is preferably from 1: 5 to 5: 1. When it is within this range, the strength of the mesh fabric in the vertical and horizontal directions is excellent in balance.

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, forces are separately applied 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.

Various methods can be used for the filling method. A method in which the hot melt fiber is contained or adhered 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.

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 on a loom to melt the hot melt fiber and bond the warp and the weft. It can be done by doing.

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 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.

The amount of the hot-melt fiber used as a filler is about 1 to 50 g / m ² , and 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 is inserted into the weft while keeping the warp tension to a minimum so as not to cause unnecessary bending or damage to the warp and the weft. Further, as the weft insertion method, a rapier method such as a band rapier or a rod rapier is particularly suitable.

The heat treatment apparatus can use any heating method as long as the hot melt fiber can be melted and the intersections of the warp and the weft can be heat-fused. In general, 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 beautifully finished and the loss of the molten resin can be further reduced.

The hot-melt fiber (low-melting polymer) for filling is spirally wound around the carbon fibers forming the warp and weft, but if it adheres linearly in parallel with the reinforcing fiber filament yarn, the filling is performed. It can be supplied during weaving by known methods in the form of yarn, and if it adheres in dots,
It can be arranged in the form of dots in the reinforcing fiber multifilament yarn in advance.

When the hot melt fiber is spirally wound, the warp and the weft are excellent in integrity, and the opening operation and the weft insertion operation can be stabilized. 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.

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, an auxiliary yarn can be used in addition to the warp and the weft composed of the carbon fiber bundle and the alkali-resistant organic fiber bundle. 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 or a unidirectional winding structure can be adopted.

This auxiliary yarn is formed by arranging a plurality of rotating disks having two yarn path holes at a position facing the center of rotation in front of the reed, and reinforcing fiber yarns 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 warp yarns, weft yarns, and auxiliary yarns constituting it, nylon resin, polyester resin, polyether ether ketone resin, polybutylene terephthalate resin, polyphenylene sulfide resin. A hardening agent such as a thermoplastic resin such as a bismaleimide resin or a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, a polyimide resin, or a phenol resin may be used, impregnated, and cured. Alternatively, a prepreg impregnated with the above resin may be prepared and attached to a structure.

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 to be applied is 5 to 70% by weight, more preferably 5 to 45% by weight, based on the above-mentioned 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 affixing 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.

[0052]

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 a 30 cm span simple support device with the surface reinforced with mesh fabric facing down, and a 500 g spherical weight. 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 a size of 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 warp and 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, the carbon fibers and the weft yarns are made so that the ratio of the number of carbon fiber bundles to the number of vinylon fiber bundles becomes 1: 1.
The vinyl pitch is alternately arranged in the order of vinylon fibers, and the fiber pitch is 10
A plain weave mixed mesh of carbon fiber and vinylon fiber of × 10 mm was prepared. 50T for the weft of the mixed weave mesh
/ M twist, 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 filaments) manufactured by Kuraray as in Example 1 were used for the warp and the weft, and the weft was hot. As shown in FIG. 2, the melt fibers are wound, and both the warp and the weft are arranged in the order of carbon fiber, vinylon fiber, and vinylon fiber so that the number ratio of the carbon fiber bundle to the vinylon fiber bundle is 1: 2,
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 twist of 50 T / m applied to the weft yarn and having a crossed portion adhered was produced. 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 warp and weft and woven into a coarse plain weave structure to produce 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.

[0060]

[Table 1]

Next, an impact test was performed on a case where a mesh 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-mentioned impact test, J
In accordance with the bending and impact test method for architectural boards of IS A1408-1995, it is placed horizontally on a simple support device having a span of 30 cm so that the surface reinforced with a mesh fabric faces 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 In the same manner as in Comparative Example 1, a mesh fabric made of only carbon fibers was produced. 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 and the weft, and the hot weft was used for the weft. Melt fibers were wound, and both the warp and the weft were arranged in the order of carbon fiber / carbon fiber / vinylon fiber 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 FIG. 2 was reversed. Then, in the same manner as in Example 1, the fiber pitch is 10 × 10 mm, and the weft is 50 T /
Then, a plain-woven mixed-woven mesh of carbon fibers and vinylon fibers, each of which had a twist of m and were bonded at the intersection, was prepared. As shown in Table 2, no cracks were observed in the test results of the mortar board reinforced with this woven fabric.

[0067]

[Table 2]

[0068]

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

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsutaro Demura 3-1 Musashi-cho, Kanazawa City, Ishikawa Prefecture (56) References JP-A-9-3745 (JP, A) JP-A-9-4049 (JP) JP-A-6-264324 (JP, A) JP-A-4-336242 (JP, A) JP-A-7-243150 (JP, A) JP-A-57-129737 (JP, A) 63-197751 (JP, A) JP-A-3-6478 (JP, U) JP-A-59-103786 (JP, U) JP-A 8-389 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) D03D 1/00-27/18

Claims (8)

(57) [Claims] The warp comprises a carbon fiber bundle and an alkali-resistant organic fiber bundle which are parallel to each other, and the weft comprises a carbon fiber bundle and an alkali-resistant organic fiber bundle which are parallel to each other. The warp
And the length and width of the void formed by the weft are both 5
Reinforcing mesh fabric that is ~ 300 mm . 2. The ratio of the number of carbon fiber bundles and the number of alkali-resistant organic fiber bundles constituting the warp is 1: 5 to 5: 1,
The reinforcing mesh fabric according to claim 1, wherein the ratio of the number of carbon fiber bundles and the number of alkali-resistant organic fiber bundles constituting the weft is 1: 5 to 5: 1. 3. The reinforcing mesh fabric according to claim 1, wherein the alkali-resistant organic fiber bundle is a vinylon fiber bundle or an acrylic fiber bundle . 4. The mesh fabric according to claim 1, wherein the mesh fabric is plain weave , braided cloth or warp.
5. The mesh fabric for reinforcement according to any one of the above. 5. The carbon fiber bundle and the alkali-resistant organic fiber bundle constituting the weft include hot-melt fibers, wherein the hot-melt fibers are melted by heat treatment, and the intersections of the meshes are filled. 5. The reinforcing mesh fabric according to any one of 1 to 4. 6. The warp yarn and / or the weft yarn, wherein hot melt fibers are spirally wound around the warp yarn and / or the weft yarn and the intersection of the warp yarn and the weft yarn is stopped by the molten hot melt fiber. The reinforcing mesh fabric according to any one of claims 1 to 3. 7. The resin was applied to the surface of a structure or a structural material, then laminating the reinforcing mesh fabric according to any one of claims 1 to 6, by impregnating the resin into the mesh fabric And a method of reinforcing a structure or a material of a structure characterized by curing a resin. 8. A method for reinforcing a hydraulic inorganic material and reinforcing mesh fabric, characterized in that embedded in hydraulic inorganic material according to any one of claims 1 to 6.