JP2002054270A - Basic material for reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a basic material for reinforcement capable of obtaining adhesion effect with concrete simply. SOLUTION: This basic material for reinforcement is composed of a cloth for reinforcement containing reinforcing fiber threads and bulky yarns, and the reinforcing fiber threads are arranged in parallel in at least direction of length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing base material, and more particularly to a reinforcing base material and a concrete product suitable for reinforcing concrete.

[0002]

2. Description of the Related Art Fiber reinforced resin material for concrete (hereinafter referred to as F)
The reinforcement by the RP material has attracted attention because the FRP material does not rust and can extend the life of the concrete product.

[0003] However, since concrete and hardened FRP material hardly adhere to each other, when stress acts on concrete, the FRP material slides in the concrete, and the stress of concrete cannot be sufficiently transmitted to the FRP material. There was a problem that the expected reinforcing effect could not be obtained.

[0004] As a countermeasure, for example, a reinforcing fiber yarn extending in the axial direction is spirally wound around the reinforcing fiber yarn to form an FRP, or the resin is cured by an uneven mold. For example, a so-called fixing method has been adopted in which the surface of the FRP material is made uneven in the same manner as a reinforcing bar and the stress of the concrete is transmitted to the FRP material without slipping in the concrete.

However, these methods require another processing to make the surface uneven, and the cost of the FRP material is greatly increased, and application to concrete products has not progressed.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a reinforcing base material which can easily obtain an effect of fixing to concrete, focusing on such a current situation.

Another object of the present invention is to provide an inexpensive concrete product reinforced by an FRP material comprising a reinforcing substrate.

[0008]

In order to achieve the above object, the present invention basically has the following arrangement. (1) A reinforcing base material comprising a reinforcing fabric including a reinforcing fiber yarn and a bulky yarn, wherein the reinforcing fiber yarns are arranged in parallel at least in a length direction.

(2) The bulk height k of the bulky yarn in the following equation, which is the relational expression between the yarn width W of the bulky yarn and the yarn fineness D, is in the range of 0.2 to 1.0. The base material for reinforcement according to the above (1).

W = k × (D / ρ) ^1/2 where W: yarn width (mm) D: yarn fineness (tex) ρ: density of bulky yarn (g / cm ³ ) (3) The reinforcement Cloth for reinforcement fiber yarn and bulky
An opening in which no yarn is present, wherein one side of the opening in which the reinforcing fiber yarn and the bulky yarn are absent is 5
mm or more, and the overall aperture ratio is 20 to 80%. The reinforcing substrate according to the above (1) or (2),

(4) The reinforcing substrate according to any one of (1) to (3), wherein the bulky yarn is made of glass fiber.

(5) The reinforcing fabric is a unidirectional woven fabric in which reinforcing fiber yarns are arranged in a length direction and bulky yarns are arranged in a width direction.
Or the reinforcing substrate according to any one of (4) to (4).

(6) The reinforcing substrate according to any one of (1) to (5), wherein the reinforcing cloth is made of a mosaic fabric.

(7) A concrete product reinforced by a fiber-reinforced resin material comprising the reinforcing substrate according to any one of (1) to (6).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. FIG. 1 is a plan view illustrating a reinforcing substrate 1 of the present invention. In FIG. 1, a large number of reinforcing fiber yarns 2 are arranged in parallel in the warp direction, bulky yarns 3 are arranged in the weft direction, and three warp yarns and three weft-direction yarns are collected. 1 shows an example of a unidirectional woven fabric having a woven fabric structure. Since the warp yarns and the weft yarns in the central portion of the three warp yarns and the weft yarns intersect with the three weft yarns and the warp yarns, the morphologically stabilized woven fabric has an opening 4 in which fibers are not present. , Resulting in a mesh. In addition, since the warp yarns and the weft yarns are gathered and intersected by three each while being mesh-shaped, when the FRP is formed, the intersecting portion is impregnated with resin and adhered, and the bonding area between the warp yarns and the weft yarns is large. Therefore, the load applied in the weft direction can be transmitted to the warp direction, and the load applied in the warp direction can be transmitted to the weft direction, so that the reinforcing effect of the FRP material on the concrete product is increased.

In addition, since bulky bulky yarn obtained by dispersing reinforcing fibers and fibers by Taslan (registered trademark) processing or the like is used for the reinforcing base material, the reinforcing base material is impregnated with resin. When cured and molded into a fiber reinforced resin into an FRP material, the resin adheres to the bulky yarn portion and becomes uneven, and concrete enters into the unevenness, thereby preventing the FRP material from slipping in the concrete, An anchoring effect on concrete is obtained.

As the bulk processing method, a normal processing method can be adopted. For example, compressed air is injected from a nozzle, a filament stream is passed through a jet stream generated thereby, and a single fiber The so-called Taslan processing, which forms a loop, is preferable because even a fiber having no elongation, such as glass fiber, can be easily bulked. A sweet twist may be applied to the Taslan processed yarn, or a decorative twisting method such as slab yarn or knot yarn may be used.

The bulk height k of the bulky yarn is determined by the following formula. The relationship between the yarn width W and the yarn fineness is as follows, from the viewpoint of making the surface of the FRP uneven by the bulkiness of the bulky yarn by impregnating the resin and enhancing the adhesion effect to concrete. Is preferably within the range.

W = k × (D / ρ) ^1/2 where W: yarn width (mm) D: yarn fineness (tex) ρ: density of bulky yarn (g / cm ³ ) k: bulky yarn FIG. 2 is a schematic view of bulky yarn 3. In the example shown in FIG. 2, the fibers constituting the bulky yarn become bulky while curling, and are arranged in the yarn axis direction.

As shown in FIG. 2, the yarn width W in the present invention refers to the bulky material of the base material which is pressed from above the glass plate and which is perpendicular to the yarn axis. - fibers 5 ₁ located outermost fibers 5 constituting the yarn, the fibers 5 _2, in which to measure the maximum width a between yarn length 10 cm, the number of measurements is expressed as the mean value of 10 times.

When the bulk height k value is less than 0.2, FRP
The surface irregularities are small, and it is not possible to sufficiently fix the surface with concrete, which is not preferable. Also, when the k value is 1.0
If it exceeds, the bulk becomes too large, and when the bulky yarn is inserted in the horizontal direction to produce a sheet, the fibers of the bulky yarn are caught by guides and the like, which is not preferable because the operability is reduced. When the k value is 0.2 to 1.0, fixation with concrete is sufficient, and the operability of sheet production is improved, which is preferable. More preferably, the bulk height k of the bulky yarn is between 0.3 and 0.7.

The reinforcing fiber yarn and the bulky
One side of the opening where no yarn is present is preferably 5 mm or more. When one side of the opening is 5 mm or more, when forming a fiber-reinforced resin material by applying and impregnating a resin, a void portion where no resin is present in the opening can be formed, and concrete is poured. At this time, it is preferable because the void is filled with cement. In addition, when the overall opening ratio of the openings occupying the reinforcing base material is 20 to 80%, the effect of fixing the concrete by the reinforcing base material is sufficiently obtained, and the reinforcing base material is hard and stiff. It is preferable because it has excellent handling properties when processed into a material. 20% aperture ratio
If it is less than 80%, the fixing of the concrete by the reinforcing substrate becomes insufficient, and if it exceeds 80%, the density of the reinforcing fiber yarn and bulky yarn decreases, and the reinforcing substrate becomes soft and stiff and loses its formability. In such a case, the handleability is reduced, and it is also difficult to arrange the reinforcing fiber yarns in a predetermined direction, which is not preferable. From such a viewpoint, a more preferable aperture ratio is 30 to 50%. One side of the opening is 10 mm or more and the opening ratio is 30 to 70%.
Is more preferable.

In the present invention, the length of one side of the opening is determined by placing a glass plate on a reinforcing base material, and setting the length of the side of each of the ten openings in the vertical and horizontal directions from above. Is measured and the average value is shown. The aperture ratio is obtained by sampling a base material of 50 cm ² from five places of the reinforcing base material, dividing the area of the opening by 50 cm ² , and indicating the average value.

The reinforcing fibers used in the present invention include glass fibers, polyaramid fibers, vinylon fibers, carbon fibers, ultrahigh molecular weight polyethylene fibers having high strength and high elastic modulus, and polyparaphenylene benzobisoxadol (PBO) fibers. Among them, carbon fibers are preferably used because of their excellent water resistance and alkali resistance. Further, it is preferable to use carbon fibers having a breaking strain of 1.5% or more and a tensile modulus of 230 GPa or more, because the life of the concrete product is prolonged and the effect of reinforcing the concrete is increased.

The bulky yarn used in the present invention includes nylon fiber, polyester fiber, vinylon fiber, polyaramid fiber and glass fiber. Glass fiber is not only inexpensive but also has high rigidity. Since deformation is small even when a stress is applied, the stress transmission efficiency is improved and a sufficient fixing effect can be obtained, which is preferable.

When it is difficult to handle the reinforcing fiber yarns and auxiliary yarns when they are impregnated with the resin or when they are handled and the auxiliary fiber yarns are misaligned (misalignment), the reinforcing fiber yarns and the auxiliary yarns are bonded with a low melting point polymer. Good to put.

The thickness of the reinforcing fiber yarn used in the present invention is preferably such that the fiber cross-sectional area of the yarn is about 0.4 to 15 mm ² . When the fiber cross-sectional area of the yarn is less than 0.4 mm ² , the thickness of the yarn becomes thin, and the weight per unit area (g / m ² )
In order to obtain a sheet having a large number of yarns, it is difficult to form a blank portion of the sheet, and if it exceeds 15 mm ² , the reinforcing fiber yarn interval becomes large and the drapability becomes too large. However, accurate fiber orientation becomes difficult, which is not preferable.

The bulky yarn preferably has a fiber cross-sectional area of about 1/10 to 1.0 of the reinforcing fiber yarn.

In the above embodiment, a unidirectional woven fabric in which reinforcing fiber yarns are arranged in one direction in the warp direction and bulky yarns are arranged in the horizontal direction as a reinforcing base material has been described. Unidirectional woven fabric with reinforcing fiber yarns and bulky yarns arranged in the weft direction, bulky yarns arranged in the weft direction, or bidirectional woven fabrics with reinforcing fiber yarns and the bulky yarns arranged in the warp and weft directions, reinforced in the warp direction The fiber yarn may be a bidirectional woven fabric in which reinforcing fiber yarns and bulky yarns are arranged in the weft direction.

Further, the woven fabric structure has a large bonding area between the warp and the weft when formed into FRP. Further, since three yarns are alternately gathered, a large opening can be formed with the same fiber amount. Although a gauze structure is preferable, the present invention is not limited to this, and a mesh woven fabric having a normal flat structure or an entangled structure or a mesh sheet in which yarns in the warp direction and the weft direction are adhered with an adhesive may be used.

Further, the formation of the reinforcing base material is not necessarily limited to the weaving means or the bonding means as described above. A knitted material in which bulky yarns are arranged and integrated with thin knitting yarns by knitting means may be used. The knitting yarn produced by the Russell insertion machine is knitted around the reinforcing fiber yarns in the warp direction while also forming a weft direction yarn, and there is no knitting structure around the weft direction auxiliary yarn. Bulkiness can be maintained.

The basis weight of the reinforcing fibers in the reinforcing substrate is 1
50g / m ² ~1,000g / m ² about is good. 150
If it is less than g / m ^2, it is necessary to increase the number of laminations in order to obtain a predetermined reinforcing effect. On the other hand, if it exceeds 1,000 g / m ² , the impregnating property of the resin into the sheet is alienated, and a sufficient opening dimension and opening ratio cannot be ensured. 150g /
When it is in the range of m ^{2 to} 1,000 g / m ² , there is no particular problem with the impregnation of the resin, and a sufficient opening size and opening ratio can be ensured.
The selection may be made within the range of the basis weight so that the stacking of the sheets is sufficient.

The concrete product of the present invention can be manufactured, for example, as follows. First, the reinforcing substrate of the present invention is shaped into a shape suitable for a concrete product, and is a room temperature-curable, room temperature-curable epoxy resin at room temperature.
A thermo-thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin or a phenol resin is sprayed up, and the resin is impregnated into a reinforcing base material and cured to form an FRP material having openings. Next, this FR
By casting the P material into a concrete product mold and solidifying the concrete, a concrete product reinforced with the FRP material can be easily manufactured.

The concrete product in the present invention is not necessarily limited to so-called concrete containing aggregate such as gravel, but includes a mortar product in which cement and sand are mixed, and includes a panel such as a curtain wall. Examples include materials, U-shaped grooves such as troughs, utility poles, pipes such as sewer pipes and water pipes, concrete pillars, piers, girders and floor slabs.

[0035]

The reinforcing substrate of the present invention is made of a reinforcing knitted fabric containing reinforcing fiber yarns and bulky yarns, so that the reinforcing effect of the reinforcing fibers is obtained. The resin adheres to the yarn, and an FRP material having an uneven surface can be obtained. The FRP material can be sufficiently and easily fixed to concrete, and the effect of reinforcing the concrete product by the FRP material can be obtained.

Further, one side of the opening of the reinforcing base material is 5
mm or more, an opening can be provided in the FRP material, and the overall opening ratio is 20 to 80%.
In this case, the anchoring with concrete is more sufficient.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a unidirectional fabric of a mosaic structure as a unidirectional sheet.

FIG. 2 is a schematic diagram showing an example of a bulky yarn.

[Explanation of symbols]

 1: reinforcement substrate 2: reinforcing fiber yarn (warp direction) 3: bulky yarn 4: opening 5: fiber constituting bulky yarn

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) D03D 15/12 B29K 105: 08 // B29K 105: 08 B29L 31:10 B29L 31:10 B29C 67/14 E F-term (Reference) 2E164 AA05 4F205 AA36 AD02 AD04 AD05 AD16 AH43 HA04 HA22 HA33 HA44 HB01 HC14 HC16 HC17 HG01 HM05 4L036 MA04 MA33 PA43 RA05 UA06 4L048 AA03 AA05 AA18 AA25 AB21 AC09 AC10 AC14 BA07 CA01 CA02

Claims (7)

[Claims] 1. A reinforcing base comprising a reinforcing fabric including a reinforcing fiber yarn and a bulky yarn, wherein the reinforcing fiber yarn is arranged in parallel at least in a length direction. Wood. 2. A yarn width W and a yarn fineness D of the bulky yarn.
The reinforcing base material according to claim 1, wherein the bulk height k of the bulky yarn in the following expression, which is a relational expression with the following, is in the range of 0.2 to 1.0. W = k × (D / ρ) ^1/2 where W: yarn width (mm) D: yarn fineness (tex) ρ: density of bulky yarn (g / cm ³ ) 3. The reinforcing fabric has an opening in which no reinforcing fiber yarn and no bulky yarn are present, and one side of the opening in which the reinforcing fiber yarn and the bulky yarn are absent is 5 mm or more. Yes, and the overall aperture ratio is 20 to 80
%. The reinforcing base material according to claim 1, wherein 4. The reinforcing substrate according to claim 1, wherein said bulky yarn is made of glass fiber. 5. The reinforcing fabric according to claim 1, wherein the reinforcing fabric is a unidirectional fabric in which reinforcing fiber yarns are arranged in a length direction and bulky yarns are arranged in a width direction.
4. The substrate for heating according to any one of the above. 6. The reinforcing substrate according to claim 1, wherein the reinforcing cloth is made of a mosaic fabric. 7. A concrete product reinforced with a fiber-reinforced resin material comprising the reinforcing substrate according to claim 1.