JP2923221B2 - Fiber reinforced plastic rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod made of fiber reinforced plastic. More specifically, the present invention has a high tensile strength, and also has excellent adhesiveness to hydraulic materials such as cement, concrete, mortar, etc., and is capable of receiving water even when an external force such as a large tensile force is applied. The present invention relates to a fiber reinforced plastic rod which does not cause detachment from a hard material or the like or peeling off.

[0002]

2. Description of the Related Art It has been known to use fiber reinforced plastic rods as a reinforcing material for hydraulic materials such as cement, concrete, mortar, etc. In such a case, fiber reinforced plastic rods are aligned in the longitudinal direction. A round fiber solid plastic reinforced plastic rod having a diameter of about 2 mm to 10 mm obtained by impregnating a number of reinforcing fibers with a resin is used. However, such conventional solid fiber reinforced plastic rods alone have insufficient mechanical strength such as tensile strength, and also have poor adhesion to hydraulic materials, and are therefore embedded in hydraulic materials. During use, it breaks, comes off from the hydraulic substance, peels off, etc., and does not function sufficiently as a reinforcing material.

Therefore, in order to improve the strength shortage of the conventional round bar-shaped solid fiber reinforced plastic rod, a plurality of the round bar-shaped solid fiber reinforced plastic rods are used in a bundle or have a diameter of 10 mm. It is common practice to increase the diameter as described above. However, in each case, the use of solid fiber reinforced plastic rods significantly increases the amount of fiber reinforced plastics that make up the bundled or larger diameter rods. As a result, the weight of the fiber reinforced plastic rod itself increases, and when burying the fiber reinforced plastic rod in hydraulic material in civil engineering work or construction work, the workability during rod transporting work or burying work is greatly increased. To decline. In addition, in manufacturing solid fiber reinforced plastic rods, material costs and processing costs are increased by using a large amount of expensive fiber reinforced plastics or by increasing the number of steps of bundling multiple solid fiber reinforced plastic rods. The price of the fiber reinforced plastic rod itself is unavoidable, which has led to an increase in construction costs for civil engineering and construction work.

Further, in order to prevent the solid fiber reinforced plastic rod from coming off or peeling off from a hydraulic substance, solid particles such as sand, gold sand, glass powder and ceramic powder are adhered to the rod surface. (For example, Japanese Patent Application Laid-Open No. 1-146047). However, in such a conventional solid fiber-reinforced plastic rod, even if solid particles are adhered to the surface, the rod cannot be sufficiently prevented from coming off or peeling off from the hydraulic substance, and for example, a tensile force of 10 tonf or more. When the rod buried in the hydraulic material is pulled over, it pulls out or peels off and does not show a sufficient reinforcing effect. In addition, there is a problem that the solid particles attached to the surface of the solid fiber reinforced plastic rod fall off from the rod surface when a large tensile strength is applied, and do not function to improve the adhesiveness with the hydraulic substance.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high mechanical strength, for example, a high tensile force exceeding 10 tonf, which does not break even when subjected to cement, mortar,
It is to provide a fiber-reinforced plastic rod which has excellent adhesiveness to a hydraulic substance such as concrete and does not cause detachment or peeling from the hydraulic substance even when a strong external force is applied. When the fiber reinforced plastic rod is embedded in a hydraulic substance at a depth of 30 cm and pulled by applying a tensile force of 10 tonf or more, the rod does not fall out of the hydraulic substance, and water is applied until the rod reaches its breaking limit. An object of the present invention is to provide a fiber-reinforced plastic rod which can be firmly held in a hard material in a stable state. The object of the present invention is not to increase the amount of fiber reinforced plastic used, and to reduce the amount of fiber reinforced plastic to the same extent as or less than that of the conventional solid fiber reinforced plastic rod described above. An object of the present invention is to provide a fiber reinforced plastic rod having excellent mechanical strength and high adhesion to a hydraulic substance or the like. Furthermore, the object of the present invention is to be lightweight,
Fiber reinforced with good mechanical strength and high adhesiveness of hydraulic materials etc. with good handleability at the time of work such as transportation work and embedding work in hydraulic materials, etc. and at an economical price The purpose is to provide a plastic rod.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present inventors have developed a fiber reinforced plastic rod.
Various studies have been made on the shape, structure, material, manufacturing method and the like. As a result, the rod does not have a solid structure consisting entirely of the fiber-reinforced plastic, but the fiber-reinforced plastic is present at a specific ratio or less only on the outer peripheral portion of the rod, and in addition, on the surface of the rod in a specific manner. The obtained fiber reinforced plastic rod in which the formed height is 0.2 mm or more has a very high mechanical strength in spite of the fact that the use of the fiber reinforced plastic is small, light and economical. It has high strength, especially tensile strength, and has excellent adhesion to hydraulic materials such as cement, mortar, concrete, etc., and even if a large tensile force is applied from the outside, it comes off or peels off from hydraulic materials, etc. The present invention was found to be able to remain firmly in a hydraulic substance without causing any such problems and to almost permanently reinforce the hydraulic substance.

That is, the present invention relates to a fiber-reinforced plastic rod comprising: (i) a fiber-reinforced plastic portion obtained by impregnating a resin into a plurality of reinforcing fibers aligned in the longitudinal direction of the rod and solidifying the resin; (Ii) in any cross-section of the rod, the percentage of the cross-sectional area occupied by the fiber-reinforced plastic portion is 70% or less of the cross-sectional area determined from the maximum outer circumference of the rod; And (iii) a convex portion having a height of 0.2 mm or more exists on the surface of the rod, and the convex portion includes a fiber, a fiber bundle, a thread, a string, and / or
Or formed by winding another linear material in a twill or spiral shape along the rod surface, attaching a cloth or mesh to the rod surface, or a combination thereof. It is a fiber reinforced plastic rod.

The details of the fiber reinforced plastic rod of the present invention (hereinafter, fiber reinforced plastic is referred to as “FRP” and fiber reinforced plastic rod is referred to as “FRP rod”) will be described in detail. First, in the FRP rod of the present invention, the FRP portion (FRP layer) does not exist at the center of the rod but exists at the outer periphery of the rod, and
The P portion (FRP layer) is formed by impregnating a resin into a number of reinforcing fibers aligned in the length direction of the rod and solidifying the resin.
It is necessary to satisfy the above requirement (i) of being composed of P.

This point will be specifically described with reference to the drawings. The FRP rod of the present invention is, for example, a hollow single-layer rod composed only of the FRP layer (FRP portion) (A) as shown in FIG. Layer (A) of FRP as exemplified in (c)
And other layers (B, B ′), or a layer (A) of FRP and another layer (F) as exemplified in FIGS. 1 (d) and (e). B, C) may be used, but in any case, in the FRP rod of the present invention, the FRP portion (F
It is necessary that the (RP layer) (A) does not exist at the center of the rod, but exists at the outer periphery of the rod as illustrated in FIGS. 1 (a) to 1 (e). . Moreover, in the FRP portion (FRP layer) (A) existing on the outer peripheral portion of the FRP rod of the present invention, a resin (plastic) 2 is applied to a large number of reinforcing fibers 1 aligned in the length direction of the rod. FRP part (FRP layer) by impregnating and solidifying
(A) is formed.

[0010] As described later, in the FRP rod of the present invention, any of a thermosetting resin and a thermoplastic resin can be used as the resin of the FRP portion. However, in the above requirement (i), "the resin is impregnated and solidified. "Means that when the resin constituting the FRP portion is a thermosetting resin, the thermosetting resin is impregnated into the reinforcing fiber, cured and solidified, and the resin constituting the FRP portion is thermoplastic. In the case of a resin, it means that a reinforcing resin is impregnated with a thermoplastic resin in a liquid state and solidified by cooling or the like. In addition, " Lock
`` Multiple reinforcing fibers aligned in the length direction of the rod ' ' means that the reinforcing fibers do not exist in the resin that has been solidified in a random form, but rather are formed by the length of the rods.
FR be present in the resin solidified in the state aligned in the direction
This means that a P portion is formed. In the present invention, that are in the presence of reinforcing fibers of many present in the resin of the FRP portion was solidified by the state of being aligned in the length direction of the rod
Thus , a greater tensile strength can be imparted to the FRP rod.

Next, the FRP rod according to the present invention has the above-mentioned requirement (ii), ie, “the cross-sectional area occupied by the FRP portion in an arbitrary cross section of the rod is determined by the cross section determined from the maximum outer circumference of the rod. 70% or less of the area ". in this regard,
To be more specific, referring to FIG. 1 described above, the FRP rod of the present invention is exemplified by the hollow single-layered rod shown in FIG. 1A and the hollow single-layered rod shown in FIG. 1B and FIG. A hollow multi-layered rod, a solid multi-layered rod as illustrated in FIGS. 1 (d) and (e), or other F
In any case of the RP rod, at any cross-section of the FRP rod (ie, even at a cross-section of the FRP rod at any point at any point perpendicular to the length of the rod), the FRP portion (FRP layer) It is necessary that the ratio of the cross-sectional area occupied by (A) is 70% or less of the cross-sectional area obtained from the maximum outer circumference of the FRP rod.

By the way, the "cross-sectional area determined from the maximum outer circumference of the FRP rod" as used in the present invention means the cross-sectional area determined from the maximum outer circumference of the rod not including the height of the protrusion existing on the surface of the rod. The FRP rod shown in FIGS. 1A to 1E will be described as an example. The diameter R (mm) of the rod that does not include the height of the protrusion 3 present on the surface of the rod is described. The cross-sectional area obtained from the above means π (R / 2) ² . Then, in the FRP rod, the FRP part (F
As shown in FIGS. 1A to 1E, the diameter of a portion occupied by a hollow portion existing inside the (RP layer) (A) and / or another layer (B, B ′, C) is represented by r ( mm)
Ratio of the cross-sectional area occupied by the FRP portion (the FRP layer) (A) to the cross-sectional area obtained from the maximum outer circumference of the rod = π (R / 2) ² (hereinafter referred to as “FRP portion occupied cross-sectional area ratio”)
Is determined by the following equation.

[0013]

## EQU1 ## FRP section occupied cross-sectional area ratio (%) = [{π (R / 2) ² −
π (r / 2) ² } {{π (R / 2) ² }] × 100

As will be described later, the cross section of the FRP rod of the present invention is not limited to a circular cross section. In some cases, the cross section may have a triangular, quadrangular, polygonal, or elliptical shape. In this case, the occupied cross-sectional area ratio of the FRP portion of the rod is also obtained in the same manner as in the case of the rods shown in FIGS.

If the occupied cross-sectional area ratio of the FRP rod is higher than 70%, the entire rod becomes FRP.
The increase rate of the surface area of the rod (that is, the surface area on the outer peripheral side of the rod) is 5% or less as compared with the above-mentioned conventional solid FRP rod formed from the above, and the surface area of the FRP rod does not increase so much. Does not lead to an improvement in the adhesiveness with hydraulic substances and the like. In the FRP rod of the present invention, the lower limit value of the occupied cross-sectional area ratio of the FRP portion is not particularly limited, but if it is too small, the thickness of the FRP portion in the outer peripheral portion of the FRP rod becomes thin, and the mechanical strength of the FRP rod, particularly, tensile strength Since the strength is reduced, it may be appropriately adjusted according to the diameter of the entire FRP rod or the like, and it is generally preferred that the occupied cross-sectional area ratio of the FRP portion is 10% or more.

In the FRP rod according to the present invention, the thickness of the FRP portion existing on the outer peripheral portion of the rod is adjusted over the entire outer periphery of the rod as shown in, for example, FIGS. It is desirable to keep it uniform or almost uniform because the strength of the FRP rod can be balanced. However, in some cases, for example, as shown in FIG. 2, in order to improve the adhesiveness with another layer provided inside the FRP portion, the hollow FRP rod has irregularities formed on the inner surface thereof. May be.

As the reinforcing fibers in the FRP portion of the FRP rod of the present invention, any of the reinforcing fibers used in conventional FRP rods can be used, and there is no particular limitation. Examples thereof include polyvinyl alcohol fibers and polyesters. Organic fibers such as base fibers, aramid fibers, acrylic fibers, and polyolefin fibers, and inorganic fibers such as glass fibers and carbon fibers can be used. Only one type of reinforcing fiber may be used, or two or more types may be used in combination.
The thickness of the reinforcing fiber is not particularly limited, but it is generally preferable to use a fiber having a single fiber fineness of about 0.1 to 100 denier. In particular, the FRP rod using the polyvinyl alcohol-based fiber has the advantage that the polyvinyl alcohol-based fiber in the rod is hardly eroded by components such as alkali contained in the hydraulic substance, and has excellent affinity and adhesion to the hydraulic substance. Therefore, when the FRP rod is used as a reinforcing material for a hydraulic substance, it is preferable to use a polyvinyl alcohol-based fiber as a reinforcing fiber.

The resin constituting the FRP portion of the FRP rod of the present invention can be any of a thermosetting resin and a thermoplastic resin, and is not particularly limited. Examples of the resin include an epoxy resin, an unsaturated polyester resin, and a vinyl resin. Thermosetting resins such as ester resins and phenolic resins, and thermoplastic resins such as nylon resins, polyetherketone resins, polyphenylsulfone resins, and polyimide resins are preferably used. Among them, the epoxy resin is more preferably used because it is alkali-resistant and hardly attacked by a hydraulic substance. In addition, the resin constituting the FRP portion is a conventional FRP.
It may contain various additives used in RP, for example, stabilizers, fillers, pigments, and the like.

The ratio of the reinforcing fiber in the FRP portion is as follows:
The volume content is preferably from 40 to 90 vol%, more preferably from 50 to 80 vol%. FR
The volume content of the reinforcing fiber in the P portion is 40 vol%
If it is lower than this, it becomes difficult to provide sufficient mechanical strength to the FRP rod due to insufficient reinforcing fibers,
On the other hand, if it exceeds 90 vol%, the adhesion between the resin and the reinforcing fiber is deteriorated, and the mechanical strength of the FRP rod, particularly, the tensile strength is also lowered.

The maximum diameter of the FRP rod of the present invention (the diameter R in FIG. 1 in the case of a rod having a circular cross section) is not particularly limited, and can be appropriately adjusted according to the use and the method of use of the FRP rod. Although it is possible, in order to sufficiently achieve the object of the present invention, the maximum diameter is set to about 20 mm.
It is preferable to set it to about 50 mm. In addition, F of the present invention
The outer shape of the RP rod is desirably a circular cross-sectional shape from the viewpoint of obtaining a balanced FRP rod having high mechanical strength. However, as described above, the cross-sectional shape may be triangular or square in some cases. , Polygons, ellipses, or other shapes.

Further, as described above, the FRP rod of the present invention has an FRP portion (FRP portion) as shown in FIG.
1) Hollow single-layer rod composed only of (A), FIG.
FRP portion (F) as exemplified in (b) and (c)
RP layer) (A) and another layer (B, B '), a hollow multi-layer rod, or an FRP portion (FRP part) as exemplified in FIGS. 1 (d) and (e). Layer)
It may be a solid multilayered rod composed of (A) and other layers (B, C). When the FRP rod of the present invention is a hollow or solid multilayered rod as shown in FIGS. 1B to 1E, the FRP portion (F
The numbers of the layers (B, B ') (tubular layers) and the layers (C) (cores) existing inside the (RP layer) (A) are shown in FIG.
It is not limited to the one of (e), but may be larger than that. Further, the layers (B, B ') (tubular layer) and the layer (C) (core) existing inside the FRP portion (FRP layer) (A)
Is polyvinyl chloride, polycarbonate, polyamide,
Polyester, polyolefin and other resin materials; various metal materials such as steel, stainless steel and aluminum;
It can be formed from a tube or rod (core) made of an inorganic material such as glass or ceramic.

The FRP rod according to the present invention has the above requirement (ii) in addition to the requirement (i) and the requirement (ii).
i), that is, "the height of the FRP rod is 0.2
mm or more convex portion, the convex portion is a fiber, a fiber bundle,
It is formed by winding a thread, string and / or other linear material along a rod surface in a twill or spiral, attaching a fabric or mesh to the rod surface, or a combination thereof. " It is necessary to have the requirement that

Although not limited, the FR of the present invention
Fig. 3 (FR
Illustrated by a schematic diagram of the appearance of a P-rod), fibers,
Fiber bundles, threads, strings and / or other linear materials 4
By wrapping the material in a twill pattern along the surface of the RP rod [FIG. 3 (a)] or by helically winding the linear material 4 along the surface of the FRP rod [FIG. 3 (b)], Linear material 4 wound on the surface of a rod
Is formed. When a cloth (a knitted cloth, a woven cloth, a non-woven cloth, etc.) or a mesh 5 is attached to the surface of the FRP rod [(c) of FIG. 3], the fibers or yarns constituting the cloth or the mesh 5 ( The projections 3 are formed on the surface of the FRP rod by meshes, textures, meshes, and the like.

In the present invention, as shown in the enlarged view of FIG. 4, the height of the convex portion means that the convex portion 3 formed by the linear material 4, the cloth or the net-like body 5 is formed from the surface of the FRP rod. It refers to the height H (mm) that protrudes outward.

When the linear material is wound around the surface of the FRP rod to form the convex portion, the linear material having a thickness such that the height of the convex portion formed by the linear material is 0.2 mm or more. It is necessary to use Further, when a convex portion is formed on the surface of the FRP rod using a cloth or a net, it is preferable to use a fiber or a thread having a roughness of 0.2 mm or more that constitutes the cloth or the net. it can. The type of the material constituting the linear material, the cloth or the net-like body is not particularly limited, but a material which has excellent adhesiveness to the FRP portion present on the outer peripheral portion of the FRP rod and is easily applied to the surface of the FRP rod is used. It is better to do F
If synthetic resin or inorganic fiber of the same type or similar to the reinforcing fiber constituting the RP portion, a bundle thereof, a thread or a string made of the same, or the like is used, the adhesion between the surface of the FRP rod and the convex portion is firmly performed. Will be

Even if the FRP rod satisfies the above requirements (i) and (ii), there is no protrusion having a height of 0.2 mm or more on the rod surface in an arbitrary cross section of the FRP rod. Or, even if the above-mentioned convex portion is present on the surface of the FRP rod, if the height of the convex portion is smaller than 0.2 mm, the adhesiveness between the FRP rod and the hydraulic substance becomes insufficient, FRP rods come off or peel off from hydraulic substances. The height of the projection is preferably 0.5 mm to 5 mm from the viewpoints of adhesion between the FRP rod and a hydraulic substance, ease of formation of the projection, and the like.

When a linear material is wound around the surface of the FRP rod in a twill or spiral shape to form a convex portion, the interval between adjacent winding portions (winding density) is determined by the thickness of the FRP rod and the convex portion. The height can be adjusted as appropriate according to the use of the FRP rod, and the like, but it is generally preferable to wind the wire in a twill or spiral shape with an interval of about 3 to 30 mm. When a convex portion is formed by attaching a fabric or a net to the surface of the FRP rod, the size of the stitch, weave, mesh, etc. of the fabric or net is also the thickness of the FRP rod and the height of the convex portion. Although it can be appropriately adjusted depending on the use of the FRP rod, it is generally preferable to set it to about 2 to 25 mm.

Further, in the FRP rod of the present invention, if necessary, solid particles such as sand, gold sand, glass powder, ceramic powder, etc., together with the above-mentioned projections formed of a linear material, a cloth or a net-like material, may be used. A convex portion formed by adhering and fixing to the surface of the rod may be used in combination.

In particular, in the present invention, in the case where the projections to be present on the surface of the FRP rod are formed by winding the linear material in a twill or spiral shape, the thickness of the linear material wound on the surface of the FRP rod By adjusting the winding density, winding direction, etc., the height of the projections,
The density (distribution state) of the projections on the surface of the FRP rod can be adjusted accurately and appropriately, and the projections formed thereby have a twill or spiral shape, and
Hydraulic properties are obtained because the protrusions are regularly and evenly distributed over the entire surface of the P rod, and the formed protrusions are firmly integrated with the FRP rod body so that the protrusions do not come off or fall off the FRP rod. F with better adhesion to substances
An RP rod can be obtained. In either case of winding the linear material on the surface of the FRP rod, or attaching a cloth or a net-like body, the resin of the FRP portion constituting the FRP rod is converted into a linear material, a cloth or a net forming a convex portion. By penetrating a part or the whole of the body and solidifying the FRP portion and solidifying (fixing) the convex portion together with the resin, the convex portion can be more firmly bonded to the surface of the FRP rod. .

In the FRP rod of the present invention, in the FRP portion present on the outer peripheral portion of the rod, a large number of reinforcing fibers are present in the solidified resin in a state of being aligned in the longitudinal direction of the rod. [Requirement (i)], a large tensile strength is given to the FRP rod particularly in the longitudinal direction, and the FRP rod has a tensile strength of 10 tonf or more.
It can be a rod.

In addition to the above, in the FRP rod of the present invention, the ratio of the FRP portion present on the outer peripheral portion of the rod (the cross-sectional area occupied by the FRP portion) having a large number of reinforcing fibers aligned in the length direction Rate) is set to be 70% or less [Requirement (ii)], the amount of FRP used is the same as that of the above-mentioned conventional solid FRP rod in which the FRP is clogged up to the center of the rod, or more. With a small amount of FRP used, an FRP rod having a larger diameter than a conventional FRP rod can be obtained while maintaining high mechanical strength. As a result, when the FRP rod of the present invention is reinforced by embedding it in, for example, a hydraulic substance, the bonding area between the hydraulic substance and the FRP rod surface becomes extremely large, and the hydraulic substance and the FRP rod The adhesion is strengthened, and the trouble of the FRP rod coming off or peeling off from the hydraulic substance is eliminated, and the reinforcement of the hydraulic substance can be permanently and firmly performed. In addition, since the amount of expensive FRP used can be reduced, the workability can be improved by reducing the weight of the FRP rod itself, and the material and construction costs in civil engineering and construction work can be increased. Can be suppressed.

Further, the FRP rod of the present invention has the requirement (i) and (i) by providing the requirement (iii) in addition to the requirement (i) and (ii).
With hydraulic rods, etc., due to the increase in rod diameter due to i)
The effect of improving the adhesion between the RP rod surface and the FRP rod and the hydraulic substance due to the presence of the protrusion having a height of 0.2 mm or more act synergistically. Then, even when the FRP rod is pulled by a large force (for example, a tensile force of 10 tonf or more), the FRP rod does not fall out of the hydraulic material, and is stably and strongly held in the hydraulic material until the breaking strength is reached. This is an excellent effect.

The method for producing the FRP rod of the present invention is not limited at all, and any method can be adopted as long as it can produce an FRP rod satisfying the above-mentioned requirements (i) to (iii). Although not limited, the FRP rod of the present invention can be manufactured, for example, by the following method. (1) Lock around the surface of a rod-shaped or tubular core, such as a metal rod or metal tube, with or without release treatment.
After applying a liquid resin composition for FRP in which a liquid resin is impregnated into a large number of reinforcing fibers aligned in the length direction of the wire, a linear material is applied thereon in a twill or spiral shape. Wrapping or attaching a fabric or mesh to FR
In a state where the resin for P is impregnated into the material for forming the convex portion,
The resin is cured by heating (in the case of a thermosetting resin) or solidified by cooling (in the case of a thermoplastic resin), and then the core is pulled out, and only the FRP portion as shown in FIG. (2) A method of manufacturing a hollow tube or a solid rod made of plastic, metal, inorganic material, or the like, which is optionally subjected to a primer or the like to improve adhesiveness. Around, the length of the rod
After applying a liquid resin composition for FRP obtained by impregnating a liquid resin into a large number of reinforcing fibers aligned in a direction in a layer, a linear material is wound thereon in a twill or spiral shape, Alternatively, a cloth or a net is adhered, and the resin for FRP is impregnated into the material for forming the convex portion, and then the resin is cured by heating (in the case of a thermosetting resin) or solidified by cooling (thermoplastic resin). ), The FRP layer and another layer (hollow tube or solid rod) are integrated, as shown in FIGS. 1 (b) to (e) in FIG. A method for producing an FRP rod having a multilayer structure.

In the above method (1) or (2), the rods are aligned in the longitudinal direction of the rod around the surface of the core tube or rod, the inner layer tube or the solid rod. Many layers of reinforcing fibers not impregnated with resin
Then, a layer of the reinforcing fiber is impregnated with a liquid resin, and thereafter, the projections are formed and the resin is solidified in the same manner as in the above (1) or (2), so that only the FRP portion is formed. Hollow single layer FRP rod or FRP
A method of manufacturing a hollow or solid multi-layer FRP rod in which a layer and another layer are integrated may be employed.

The FRP rod of the present invention has a large surface area, is lightweight (especially in the case of a hollow FRP rod), has high mechanical strength represented by tensile strength, and is suitable for hydraulic materials such as cement, mortar, concrete and the like. Since the adhesiveness is extremely good, for example, embankment reinforcement, slope reinforcement,
It can be used very effectively as a reinforcing material for hydraulic substances in civil engineering works and building works as an earth anchor, a substitute for reinforcing steel, and the like.

[0036]

EXAMPLES The present invention will be specifically described below with reference to examples and the like, but the present invention is not limited thereto. In the following examples, the maximum diameter (R) of the FRP rod, the sectional area ratio occupied by the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion,
The tensile strength and concrete adhesive strength of the FRP rod are
It was measured or evaluated as follows.

[Maximum Diameter of FRP Rod] The FRP rod obtained in the example or the comparative example is cut at an arbitrary position at right angles to the rod length direction, and the maximum diameter (R) (mm) at the cut surface is determined. It was measured using a caliper.

[FRP portion occupied cross-sectional area ratio] The maximum diameter (R) (mm) at the above-mentioned cut surface and the diameter (r) (mm) of the inner portion of the FRP portion were measured using calipers, and the above-mentioned equation was used. The occupied cross-sectional area ratio (%) of the FRP portion was obtained by the above.

[Fiber Volume Content in FRP Portion] The weight (Wr) (g / m) of the resin per unit length of the FRP rod was determined by the following equation (1), and the following equation (2) was obtained from the value. ), The fiber volume content in the FRP portion (V
f) (%) was determined.

[0040]

Wr (g / m) = W (g / m) −Wf (g / m) −W ′ (g / m) (1) Vf (%) = [(Wf / ρf) / {(Wr / Ρr) + (Wf / ρf)}] × 100 (2) [Wr = weight of resin per unit length of FRP rod (g / m) W = weight of FRP rod per unit length Weight (g / m) Wf = weight of reinforcing fiber per unit length of FRP rod
(g / m) W ′ = weight (g / m) of inner layer (tubular layer and / or core) of FRP layer per unit length of FRP rod Vf = fiber volume content (%) in FRP portion ρf = specific gravity of reinforcing fiber in FRP portion ρr = specific gravity of resin in FRP portion]

[Protrusion Height] The height of the convex portions present on the outer periphery of the FRP rod obtained in the example or the comparative example at any five points was measured using a caliper (H). The average value (mm) of the points was determined.

[Tensile Strength] The tensile strength was measured as follows using the apparatus shown in FIG. In FIG. 5, reference numeral 6 denotes a strain gauge, 7 denotes a fixing jig, 8 denotes a washer, 9 denotes a hydraulic cylinder, 10 denotes a strain gauge, 11 denotes a center hole type load cell, 12 denotes a washer, 13 denotes a fixing jig, and 14 denotes a fixing jig. Reference numeral 15 denotes a hydraulic jack, 16 denotes a strain amount measuring device, and 17 denotes a stress measuring device. FRP rod (F)
Fixing Jig 7 and Fixing Jig 13 with Metal Tubes at Both Ends
The insides of the fixing jigs 7 and 13 are filled with epoxy resin and hardened in a state where they are inserted respectively, and both ends of the FRP rod (F) are fixed to the fixing jigs 7 and 13. Then, by applying pressure using the hydraulic jack 15,
The fixing jig 13 is moved together with the center hole type load cell 11 and the washer 12 (moving rightward as viewed in FIG. 5) to apply a tensile force to the FRP rod (F), and the hydraulic pressure when the FRP rod (F) is broken The pressure (tonf) applied by the jack 15 and the amount of strain were read by the measuring devices 16 and 17 to determine the tensile strength of the FRP rod.

[Concrete adhesive strength] The FRP rod obtained in the example or the comparative example was cut into a length of 120 cm.
The concrete was manufactured using ordinary cement (compression strength 210 kg / cm ² , slump 15 cm; J
After embedding in a depth of 30 cm and hardening the concrete in IS A 5308 (standard product described in IS A 5308), the portion protruding to the outside of the concrete is gripped, and the
In the longitudinal direction of the RP rod), the FRP rod was pulled until it broke or came off the concrete, and the tensile strength at the time of breaking or coming off was measured to evaluate the adhesive strength to concrete.

Example 1 (1) Polyvinyl alcohol fiber [“VINYLON 7901” manufactured by Kuraray Co., Ltd.] (Yarn Denier 1800d /
1000f) are bundled, and an epoxy resin (“Epicoat 807” manufactured by Yuka Shell Epoxy) and a curing agent (“Epicure Z” manufactured by Yuka Shell Epoxy) are mixed in a ratio of 100: 2.
And impregnated with a liquid of the epoxy resin composition mixed at a weight ratio of 2 around a metal rod having a diameter of 12 mm heated to 150 ° C. so that polyvinyl alcohol fibers are parallel to the length direction of the metal rod. In addition, the uncured coating layer of FRP was formed by uniforming the thickness so as to be uniform. (2) Next, the same polyvinyl alcohol fiber 3
Using two fiber bundles that had been twisted in advance at a rate of 60 times / m, the book was wound in a twill shape while applying tension to the surface of the FRP uncured coating layer formed in (1) above. Thereafter (a distance between adjacent spirals in one winding bundle of fibers of 15 mm), the epoxy resin composition was cured by keeping the temperature at 150 ° C. for 30 minutes. After cooling, the metal rod at the center was pulled out to obtain a hollow single-layer FRP rod composed of only the FRP portion shown in FIG. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Example 2 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
96 pieces were bundled and impregnated with a liquid of the same epoxy resin composition as used in Example 1, and this was wrapped around a polyvinyl chloride pipe (13A for water pipes; outer diameter 18 mm, inner diameter 15 mm), and polyvinyl alcohol fiber was An uncured coating layer of FRP was formed by aligning the polyvinyl chloride pipe so as to be parallel to the length direction and to have a uniform thickness. (2) Next, the same polyvinyl alcohol fiber 3
Using two fiber bundles that had been twisted in advance at a rate of 60 times / m, the book was wound in a twill shape while applying tension to the surface of the FRP uncured coating layer formed in (1) above. After that (the distance between adjacent spirals in a single fiber bundle for winding is 15 mm), the epoxy resin composition is cured at 150 ° C. for 30 minutes, and the FRP is placed on a polyvinyl chloride pipe.
The hollow multilayer structure FR shown in FIG.
A P rod was obtained. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Example 3 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
A bundle of 596 pieces was impregnated with a liquid of the same epoxy resin composition as used in Example 1, and this was wrapped around a polyvinyl chloride pipe (20 A for water pipes; outer diameter 26 mm, inner diameter 20 mm), and polyvinyl alcohol fiber. An uncured coating layer of FRP was formed by aligning the polyvinyl chloride pipe so as to be parallel to the length direction and to have a uniform thickness. (2) Next, the same polyvinyl alcohol fiber 3
Using two fiber bundles that have been twisted in advance at a rate of 60 times / m, the book is wound in a twill shape on the surface of the uncured coating layer of the FRP formed in the above (1) while adjusting the tension. After that (the distance between adjacent spirals in a single fiber bundle for winding is 15 mm), the epoxy resin composition is cured by keeping it at 150 ° C. for 30 minutes, and the F is placed on a polyvinyl chloride pipe.
A hollow multi-layer FRP rod having a RP layer and shown in FIG. 1B was obtained. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Example 4 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
A bundle of 520 fibers was impregnated with a liquid of the same epoxy resin composition as used in Example 1, and this was wrapped around a polyvinyl chloride pipe (for water pipes 16A; outer diameter 22 mm, inner diameter 15 mm), and polyvinyl alcohol fiber was An uncured coating layer of FRP was formed by aligning the polyvinyl chloride pipe so as to be parallel to the length direction and to have a uniform thickness. (2) Next, the same polyvinyl alcohol fiber 3
Using two fiber bundles that have been twisted in advance at a rate of 60 times / m, the book is wound in a twill shape on the surface of the uncured coating layer of the FRP formed in the above (1) while adjusting the tension. After that (the distance between adjacent spirals in a single fiber bundle for winding is 15 mm), the epoxy resin composition is cured by keeping it at 150 ° C. for 30 minutes, and the F is placed on a polyvinyl chloride pipe.
A hollow multi-layer FRP rod having a RP layer and shown in FIG. 1B was obtained. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Example 5 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
A bundle of 536 pieces was impregnated with a liquid of the same epoxy resin composition as used in Example 1, and was wrapped around a metal rod having a diameter of 40 mm heated to 150 ° C., and a polyvinyl alcohol fiber having a length of the metal rod. The uncured coating layer of FRP was formed so as to be parallel to the direction and to have a uniform thickness. (2) Next, the same polyvinyl alcohol fiber 5 as described above
Using two fiber bundles, which had been twisted in advance at a rate of 50 times / m, the book was wound in a twill shape while applying tension to the surface of the uncured coating layer of FRP formed in (1) above. Thereafter (a distance between adjacent spirals in one winding bundle of fibers of 15 mm), the epoxy resin composition was cured by keeping the temperature at 150 ° C. for 30 minutes. After cooling, the metal rod at the center was pulled out to obtain a hollow single-layer FRP rod composed of only the FRP portion shown in FIG. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Comparative Example 1 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
After bundling 60 pieces and impregnating the same with a liquid of the same epoxy resin composition as used in Example 1, the polyvinyl alcohol fibers were aligned so as to be parallel to the length direction, and the surface thereof was the same as above. 3 polyvinyl alcohol fibers 60
After twisting two fiber bundles that have been twisted in advance at a rate of times / m in a twill shape while applying tension (the distance between adjacent spirals in one winding fiber bundle is 15 mm), 150
At 30 ° C. for 30 minutes to cure the epoxy resin composition,
A solid FRP rod (FRP section occupied cross-sectional area ratio = 100%) was obtained. (2) The maximum diameter (R) of the FRP rod obtained in the above (1), the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force were measured or evaluated by the above-described methods. It was as shown in Table 1 below.

Comparative Example 2 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used
96 pieces were bundled and impregnated with a liquid of the same epoxy resin composition as used in Example 1, and this was polyvinyl chloride pipe (13A for water pipe; outer diameter 18 mm, inner diameter 13 mm)
The uncured coating layer of FRP was formed by lining up the polyvinyl alcohol fibers so as to be parallel to the length direction of the polyvinyl chloride pipe and to have a uniform thickness. (2) Next, the same polyvinyl alcohol fiber 1 as described above
Using two fiber bundles that had been twisted in advance at a rate of 20 times / m, the book was wound in a twill shape while applying tension to the surface of the FRP uncured coating layer formed in (1) above. After that (the distance between adjacent spirals in a single fiber bundle for winding is 15 mm), the epoxy resin composition is cured at 150 ° C. for 30 minutes, and the FRP is placed on a polyvinyl chloride pipe.
The hollow multilayer structure FR shown in FIG.
A P rod was obtained. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

Comparative Example 3 (1) The same polyvinyl alcohol fiber (yarn denier 1800d / 1000f) as used in Example 1 was used.
016 bundles, impregnated with a liquid of the same epoxy resin composition as used in Example 1, and wrapped around a polyvinyl chloride pipe (13A for water pipe), a polyvinyl alcohol fiber of the polyvinyl chloride pipe was used. F is aligned so that it is parallel to the length direction and the thickness is uniform.
An uncured RP coating layer was formed. (2) Next, the same polyvinyl alcohol fiber 3
Using two fiber bundles that had been twisted in advance at a rate of 60 times / m, the book was wound in a twill shape while applying tension to the surface of the FRP uncured coating layer formed in (1) above. After that (the distance between adjacent spirals in a single fiber bundle for winding is 15 mm), the epoxy resin composition is cured at 150 ° C. for 30 minutes, and the FRP is placed on a polyvinyl chloride pipe.
The hollow multilayer structure FR shown in FIG.
A P rod was obtained. (3) The maximum diameter (R) of the FRP rod obtained in the above (2), the occupied cross-sectional area ratio of the FRP portion, the fiber volume content in the FRP portion, the height of the convex portion, the tensile strength, and the concrete adhesive force are described above. As a result of measurement or evaluation, the results were as shown in Table 1 below.

[0052]

[Table 1]

From the results in Table 1 above, the above requirements (i) to
FRPs of Examples 1 to 5 satisfying all of (iii)
The rod (ie, the FRP portion containing a large number of reinforcing fibers aligned in the same direction is present on the outer peripheral portion of the rod at an FRP portion occupying cross-sectional area ratio of 70% or less, and the height of the rod is 0.2 mm. An FRP rod in which one or more of the above-mentioned protrusions are present in an arbitrary cross section of the rod)
It has a high tensile strength of 0 tonf or more, and has excellent adhesiveness to concrete, does not fall out of concrete, and is firmly adhered and held in concrete until its tensile stress reaches a breaking stress (tensile strength). It turns out that concrete reinforcement is performed.

On the other hand, when the above-mentioned requirement (ii) in the present invention is not satisfied, the sectional area ratio occupied by the FRP portion is 10%.
Both the solid single-layer FRP rod of Comparative Example 1 having 0% and the hollow multilayer FRP rod of Comparative Example 3 having the FRP portion occupied cross-sectional area ratio of 75% have a height of 0% on the rod surface. Despite the existence of a convex portion of 0.2 mm or more, the adhesiveness to concrete was poor, and each was 6.4 ton.
It can be seen that when a tensile force of f and 24.8 tonf is applied, the concrete easily escapes from the concrete and cannot sufficiently function as a reinforcing material.

The FRP rod of Comparative Example 2 was made of FRP
Although the part occupied cross-sectional area ratio is 48% and satisfies the above requirement (ii), the height of the projection is 0.1 mm and does not satisfy the above requirement (iii). Poor adhesion to concrete, 3.0 to
It can be seen that when a tensile force of nf is applied, the material easily comes off the concrete and cannot sufficiently function as a reinforcing material.

[0056]

The FRP rod of the present invention has high mechanical strength, especially high tensile strength, and has excellent adhesiveness to hydraulic substances such as cement, mortar, concrete, etc., and has a strong external force. Even if it is applied, it does not come off or peel off from the hydraulic material etc., it is firmly held in a stable state as it is in the hydraulic material, and reinforcement of the hydraulic material etc. can be performed semipermanently and stably . Further, in the case of the present invention, the amount of FRP used is equal to or smaller than that of the conventional solid FRP rod,
An FRP rod having the above-mentioned excellent mechanical strength and high adhesiveness to a hydraulic substance or the like can be obtained. And since the FRP rod of the present invention (especially a hollow FRP rod) is light in weight, it is easy to handle at the time of work such as carrying work, embedding work in a hydraulic substance or the like. In addition, in the case of the present invention, since the amount of FRP used is small, the FRP having excellent mechanical strength and high adhesiveness such as a hydraulic substance at an economical price is required.
A rod can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of an example of an FRP rod of the present invention.

FIG. 2 is a view showing a cross section of another example of the FRP rod of the present invention.

FIG. 3 is a schematic view of an appearance of an example of an FRP rod of the present invention.

FIG. 4 is a diagram showing a method for measuring the height of a convex portion of an FRP rod.

FIG. 5 is a view showing the structure of an apparatus used for measuring the tensile strength of an FRP rod.

[Explanation of symbols]

 A FRP part (FRP layer) B Other layer B 'Other layer C Other layer (core) F FRP rod 1 Reinforcing fiber 2 Resin 3 Convex part 4 Linear material 5 Cloth or net 6 Strain gauge 7 Fixing Jig 8 Washer 9 Hydraulic Cylinder 10 Strain Gauge 11 Center Hole Type Load Cell 12 Washer 13 Fixing Jig 14 Strain Gauge 15 Hydraulic Jack 16 Strain Measuring Device 17 Stress Measuring Device

Continuing on the front page (72) Inventor Atsuo Fukuda 2-4-1 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72) Inventor Shigeru 2-4-1 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72 ) Inventor Shuji Kami 2-4-1 Akasaka, Minato-ku, Tokyo Tennox Co., Ltd. (72) Inventor Kiyoshi Ozawa 2-4-1 Akasaka, Minato-ku, Tokyo Tennox Co., Ltd. (72) Inventor Mitsuo Madayahara 1-2-1, Kaigandori, Okayama City, Okayama Prefecture Kuraray Co., Ltd. (72) Inventor Tadayuki Yamamoto 3-8-2 Nihonbashi, Chuo-ku, Tokyo Co., Ltd. Kuraray Co., Ltd. (72) Inventor Junichi Hikasa Okayama, Okayama Prefecture 1-2-1, Kaigan-dori-shi, Kuraray Co., Ltd. (72) Inventor Isao Sone 1-2-1, Kaigandori, Okayama-shi, Okayama Pref. Kuraray Co., Ltd. (72) Toshihiro Hamada, Nihonbashi, Chuo-ku, Tokyo 3-8-2 Kuraray Co., Ltd. (72) Inventor Shinji Matsuo 3-8-2 Nihonbashi, Chuo-ku, Tokyo Kuraray Co., Ltd. (56) References JP-A-61-257562 (JP, A) JP-A-5-212715 (JP, A) JP-A-6-207445 (JP, A) JP-A-60-203761 ( JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04C 5/00-5/16

Claims (5)

(57) [Claims] 1. A fiber-reinforced plastic rod comprising: (i) a fiber-reinforced plastic portion obtained by impregnating a resin into a plurality of reinforcing fibers aligned in the longitudinal direction of the rod and solidifying the resin; (Ii) in any cross section of the rod, the proportion of the cross-sectional area occupied by the fiber-reinforced plastic portion is 70% or less of the cross-sectional area determined from the maximum outer circumference of the rod; and (iii) The rod has a convex portion having a height of 0.2 mm or more on the surface of the rod, and the convex portion includes a fiber, a fiber bundle, a thread, a string, and / or
Or formed by winding another linear material in a twill or spiral shape along the rod surface, attaching a cloth or mesh to the rod surface, or a combination thereof. Fiber reinforced plastic rod. 2. The fiber-reinforced plastic rod according to claim 1, wherein the rod is a hollow single-layered rod composed of only a fiber-reinforced plastic layer or a hollow or solid multilayered rod composed of a fiber-reinforced plastic layer and another layer. 3. The reinforcing fiber is one of an organic fiber such as a polyvinyl alcohol fiber, a polyester fiber, an aramid fiber, an acrylic fiber and a polyolefin fiber, and an inorganic fiber such as a glass fiber and a carbon fiber. 3. The fiber reinforced plastic rod according to claim 1, which is selected from two or more kinds. 4. The fiber reinforced plastic rod according to claim 1, wherein finer solid particles are attached to the surface of the fiber reinforced plastic rod. 5. A reinforcing material for a hydraulic substance.
5. The fiber reinforced plastic rod according to any one of 4 above.