JP2943585B2 - Reinforcing material for inorganic material and method for producing the same - 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 material for an inorganic material and a method for producing the same, and more particularly, to a reinforcing material having a large adhesion to an inorganic matrix such as concrete, and a method for producing the same relatively easily. About.

[0002]

2. Description of the Related Art Concrete structures in the field of civil engineering and construction are generally manufactured as composites using reinforcing bars as reinforcing materials and concrete as a matrix. In the case of a prestressed concrete structure, a tendon of high strength steel is embedded as a reinforcing material.

However, since the above-mentioned reinforcing materials are all heavy, there is a problem in transportation and construction, and furthermore, the mechanical strength of the reinforcing material decreases with time due to erosion by alkaline concrete. In particular, in places where salt damage occurs, the erosion of the reinforcing steel and the tendon material progresses violently, thus causing a problem of shortening the service life. For these reasons, recently, the use of a fiber-reinforced resin composite material (hereinafter, referred to as an FRP material) that has little possibility of corrosion as a reinforcing material has been studied.

[0004] In this case, the reinforcing material is required to exhibit strong adhesion to concrete as a matrix, in addition to having high tensile strength. As a reinforcing material made of such an FRP material, for example, Japanese Patent Laid-Open Publication No. Hei 3-33045 proposes the following fiber-reinforced resin filament having a spiral concave portion. That is, the reinforcing material is wound around the outer periphery of the reinforcing fiber bundle impregnated with the resin by winding the tough linear body into the spiral at a predetermined interval.
The impregnated resin is cured, and then the wound linear body is removed to form a spiral concave portion on the surface of the obtained FRP material.

[0005] The reinforcing material has an adhesive force to concrete by a spiral concave portion formed on the surface. However, in the case of this reinforcing material, since the linear body is cut into the surface of the reinforcing fiber bundle, the reinforcing fiber is bent at the place where the linear body is cut. For this reason, the strength and elastic modulus of the reinforcing fiber are not effectively utilized, and after the resin is cured, stress concentration tends to occur at the fiber bending portion, causing a decrease in the strength and elastic modulus in the longitudinal direction, which poses a practical problem. Come up.

As a reinforcing material made of an FRP material, Japanese Utility Model Laid-Open Publication No. Hei 4-20521 discloses a mesh fabric in which reinforcing fiber yarns are formed into warp and weft yarns and a hardening agent is provided. However, this mesh fabric is a two-dimensional reinforcing material, and in the case of a reinforcing column that is composited with this, the reinforcing fibers are not arranged in the cross-sectional direction and the shearing direction, so that sufficient strength against bending and torsion is provided. It is difficult to demonstrate.

Further, Japanese Utility Model Application Laid-Open No. 4-23732 discloses a plurality of reinforcing fiber yarns extending in parallel with each other and waving and intersecting with the plurality of reinforcing fiber yarns. And a mesh-like three-dimensional structure having a plurality of connecting yarns connecting the plurality of reinforcing fiber yarns to each other and having a hardening agent applied to at least the reinforcing fiber yarns. Have been.

[0008] In the case of this mesh-like three-dimensional structure, when it is combined with concrete, the obtained composite does not sufficiently exhibit the reinforcing effect in the shearing direction, and it is necessary to arrange the desired shape uniformly. And the operation of connecting the organizations to each other is also complicated. In addition, since the reinforcing fiber yarns are arranged so as to be greatly bent, there is also a problem that, in this structure, the fiber strength is apparently reduced.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide an FR
Solving the above-mentioned problems in the reinforcement material made of P material,
An object of the present invention is to provide a reinforcing material for an inorganic material having a large tensile strength and a strong adhesive force to an inorganic material such as concrete, and a method of manufacturing the same relatively easily.

[0010]

In order to achieve the above-mentioned object, in the present invention, it is provided that a long mesh made of FRP material has a regular mesh pattern formed on a surface thereof. A reinforcing material for an inorganic material is provided. Further, in the present invention, a net having a regular mesh pattern is pressure-bonded to the surface of a long body made of a composite material of a reinforcing fiber and an uncured or semi-cured thermosetting resin, A method for producing a reinforcing material for an inorganic material (hereinafter, referred to as a first production method), wherein the curable resin is cured and then the network is peeled off, and a reinforcing fiber and uncured or semi-cured thermosetting. On the surface of a long body made of a composite material with a thermosetting resin, a mesh having a regular mesh pattern is pressed and subjected to a shaping process, and then the thermosetting resin is cured, and then the mesh is peeled off. Characterized in that
A method for producing a reinforcing material for an inorganic material (hereinafter, referred to as a second production method), wherein a long body made of a composite material of a reinforcing fiber and an uncured or semi-cured thermosetting resin has a regular network pattern. A method for producing a reinforcing material for an inorganic material (hereinafter, referred to as a third production method), wherein the thermosetting resin is cured while being sandwiched between a pair of endless belts;
An uncured thermosetting resin is applied to the surface of a long body made of an FRP material, and then the thermosetting resin is cured while being sandwiched between a pair of endless belts having a regular mesh pattern. (Hereinafter, referred to as a fourth manufacturing method) of the reinforcing material for an inorganic material.

Further, in the present invention, a thermosetting resin-impregnated fiber bundle is wound around a mandrel by a filament winding method, and then a mesh having a regular mesh pattern is wound thereon. A method of manufacturing a cylindrical reinforcing material for inorganic material (hereinafter, referred to as a fifth manufacturing method), wherein after the thermosetting resin is cured, the mandrel is withdrawn and the net is separated. A thermosetting resin-impregnated fiber bundle was wound by a filament winding method on a mandrel on which a net having a regular mesh pattern was wound, and a net having a regular mesh pattern was wound thereon. Thereafter, the thermosetting resin is cured, and then the mandrel is withdrawn and the outer and inner nets are separated from each other. Method for producing a wood (hereinafter, referred to as a sixth method for manufacturing a) is provided.

[0012]

FIG. 1 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 2 shows an example of a reinforcing material of the present invention. The reinforcing member A is a solid long body as a whole, and is used as a reinforcing bar or a tension member. Note that, as the solid long body, the figure shows a cross section having a circular shape, but this cross section is not limited to a circle, and may be an ellipse, a triangle, a polygon, a star, or the like. Good.

The reinforcing material A is a long body 1 of an FRP material comprising a reinforcing fiber 1a and a matrix 1b of a cured resin.
And a projection group 2 formed on the surface of the elongated body and composed of a layer of a cured thermosetting resin. This projection group 2 is an enlarged view of a portion III surrounded by a circle in FIG.
As shown by, the projections 2a distributed in the longitudinal direction and the circumferential direction of the elongated body 1 in a regular mesh pattern are gathered. The mesh pattern in this case, when combined with concrete as a reinforcing bar or tendon to form a concrete composite, enhances the engagement between the projections and the concrete to increase the bending strength and tensile strength of the concrete composite. In consideration of increasing the strength, for example, a polygonal pattern such as a honeycomb pattern (hexagonal pattern) or a square pattern is preferable.

The shape of each projection 2a is preferably such that the cross-sectional shape in the longitudinal direction of the elongated body 1 is trapezoidal or circular. In this case, it is preferable that the rising angle θ of the inclined surface 2b of the projection 2a be 45 ° or less with respect to the surface 2c of the resin cured material layer having the projection group. The reason is as follows.

That is, since the concrete has a compression resistance about 5 times higher than the shear resistance of the concrete, the reinforcement is pulled out from the composite obtained by combining the above-mentioned reinforcement with the concrete. The force acting on the slope 2b of the projection 2a is dominated by the shear component when the rising angle θ of the slope 2b is large. Therefore, if the rising angle θ is larger than 45 °, the concrete or the projection 2a is likely to be sheared and broken. However, when the rising angle θ is smaller than 45 °, the force acting on the inclined surface 2b is dominated by the compression component, so that shear fracture is unlikely to occur, which is advantageous for securing the adhesive force with concrete.

The height h of each projection 2b is preferably 2 mm or less. When this height h is a protrusion higher than 2 mm, when combined with concrete,
This is because the projection 2a is easily broken by the shear stress. Further, the distribution density of the projections 2b on the surface of the elongated body 1 is such that when each projection is cut at half the average height of the projection group, the sum of the areas of the cut surfaces is the total surface area of the elongated body 1. It is preferable that the distribution density is 2/3 or less. If the distribution density of the projections 2b is not in the above-mentioned state, when combined with concrete, the engagement between the concrete and the projection group is insufficient, and the adhesion strength to the concrete is reduced.

The reinforcing member shown in FIGS. 1 to 3 can be manufactured by the above-described first to fourth manufacturing methods. First, the first manufacturing method will be described with reference to FIG. FIG.
In the production line indicated by, bobbins 3a, 3b, 3c around which reinforcing fiber bundles aligned in one direction are wound
And a resin tank 5 containing an uncured liquid thermosetting resin 4
, A guide 6, a delivery bobbin 8 for delivering a mesh body 7 described later, a heat treatment furnace 9, a winding bobbin 10 for the mesh body 7, and a drawing device 11 are arranged in series in this order.
The reinforcing fiber bundle runs continuously on this line.

First, a plurality of reinforcing fiber bundles wound up from the bobbins 3a, 3b, 3c are bundled and immersed in a thermosetting resin 4 in a resin tank 5 as a thicker fiber bundle. As a result, the uncured and liquid thermosetting resin is impregnated between the reinforcing fibers, and the elongated body 1 'which is a precursor of the FRP material is continuously manufactured. Examples of the fiber bundle used herein include reinforcing fibers such as inorganic fibers such as carbon fibers, glass fibers, alumina fibers, boron fibers, and ceramic fibers; and organic fibers such as aramid fibers, polyethylene fibers, and vinylon fibers. One in which fibers having high strength and high elastic modulus are aligned in one direction can be given.

The thermosetting resin 4 impregnated in the fiber bundle
Examples thereof include epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin and the like. At this time, the content of the reinforcing fibers in the elongated body 1 'is preferably set to 40 to 80% by volume. If the content is out of the above range, the tensile strength of the finally obtained reinforcing material itself tends to be small.

Next, the elongated body 1 ′ passes through the guide 6 to remove excess resin and the like adhering to the surface, thereby shaping the cross-sectional shape. The mesh body 7 sent out from the sending-out bobbin 8 is wound without gaps. When the cross-sectional shape of the long body 1 'is a square, the mesh body 7 may be attached to the surface of the long body 1'.

The net 7 is, for example, a flexible band having a regular mesh pattern 7a as shown in FIG. In the net-like body 7, the mesh pattern 7a forms a projection group on the surface of the intended reinforcing material, and the connecting portion 7b between the mesh patterns forms a pitch between the projection groups and a gradient surface of each projection. Stipulates the state of This mesh pattern 7
The shape of a is not particularly limited, but is preferably a polygonal pattern such as a honeycomb pattern. This is because the shape of the surface protrusion group of the manufactured reinforcing material also has a polygonal pattern, and the adhesive force with concrete increases.

Examples of the reticulated body 7 include organic fibers such as polyester fiber, polyamide fiber, aramid fiber, polyacryl fiber, polyurethane fiber and vinylon fiber, and glass fiber, alumina fiber, boron fiber and silicon carbide fiber. Knitted or woven fabrics of inorganic fibers, metal fibers such as stainless steel fibers, single fibers, spun yarns, braids and the like can be given. However, when organic fibers are used, the organic fibers need to have heat resistance higher than the curing temperature of the thermosetting resin used as the matrix. This is because the thermosetting resin is softened during thermosetting described later, and the reinforcing effect of the reinforcing material is lost.

The thickness of the reticulated body 7 is 0.05 to 0.05.
Preferably it is 2 mm. When a mesh having a thickness of less than 0.05 mm is used, the projections on the surface of the manufactured reinforcing material become too fine, and the adhesion to concrete decreases. Further, when a mesh having a thickness of more than 2 mm is used, the pitch between the projections on the surface of the manufactured reinforcing material becomes too long, and in this case, the adhesion to the concrete is reduced.

The net bundle 7 has a yarn bundle density of 2 to 46 yarns /
cm. When a net having a yarn bundle density of less than 2 yarns / cm is used, when this net is wound around a long body 1 'which is a precursor of the FRP material, the yarn spacing of the net 7 is large, so that reinforcement is required. The distribution density of the projections formed on the surface of the material becomes too small, and the adhesive force with concrete decreases. Further, when a mesh having a yarn bundle density of more than 46 yarns / cm is used, the projections formed on the surface of the reinforcing material become too fine, and the adhesion to concrete decreases.

The knitted material used for the net 7 preferably has a non-stretchable structure. For example, a lace knit or a net is particularly preferable. As the woven fabric, for example, a mesh structure can be given as a particularly suitable one. Further, as the reticulated body 7, a metal film or a resin film obtained by subjecting a hole processing to a desired mesh pattern, or a metal film or a resin film formed with a concavo-convex pattern can be used. In particular, if a material such as a punched metal sheet is welded at both ends, it can be used as an endless belt for forming a group of protrusions, and at the same time it has excellent wear resistance, so it can be used repeatedly. It also contributes to cost reduction.

Further, drums and rolls having a regular mesh pattern formed on the surface can also be used as the mesh for forming the projection group. If a release agent such as a Teflon-based release agent is applied to the surface of these reticulated bodies,
This is effective because it facilitates peeling of the mesh body described later and prevents damage to the projections.

[0027] or wound on the surface of the elongate body 1 'is a mesh-like body 7 as shown in FIG. 5 a precursor of FRP material, adhered to
Then , the connecting portion 7b penetrates into the layer of the uncured thermosetting resin on the surface of the long body 1 ', and at the same time, the resin oozes out of the mesh pattern 7a.

Next, the elongated body 1 ′ is introduced into the heat treatment furnace 9. As a result, the uncured or semi-cured thermosetting resin is thermoset, and the long body 1 ′ becomes FRP, and the mesh body 7 is fixed in the layer of the cured resin on the FRP surface. Thereafter, the mesh body 7 is continuously wound by the winding bobbin 10 to be peeled off from the surface of the cured resin layer.

As a result, on the surface of the FRP, a projection having the same shape as the mesh pattern 7a of the mesh body 7, and a projection group 2 having the connecting portion 7b as a pitch between the projections are formed, as shown in FIG. Such a reinforcing material 1 is manufactured. Next, in the second manufacturing method, a mold having a desired cross-sectional shape is arranged between the delivery bobbin 8 and the heat treatment furnace 9 shown in FIG. 4, and the mesh body 7 is wound or adhered to this mold. This is a method of passing through the elongated body 1 ′.

According to this method, the extra resin that irregularly oozes out of the mesh pattern of the mesh body is removed by the mold,
Since the entire outer shape of the long body 1 'is shaped into the shape of the mold,
The web 7 can be easily peeled off by the winding bobbin 10, and the cross-sectional shape of the obtained reinforcing material is made uniform to facilitate handling. In the shaping process, the above-described shape is arranged on the upstream side in the heat treatment furnace 9 so that the thermosetting resin in the uncured state in the elongated body 1 ′ is thermoset simultaneously with the removal of an unnecessary portion. You may.

When a reinforcing material having a rectangular cross section is manufactured by the first manufacturing method and the second manufacturing method .
When the net 7 is wound, the net
By sticking 7, there is a projection group only on the upper and lower surfaces
Reinforced material can be obtained. Next, a third manufacturing method will be described. In the production line of this method, for example, FIG.
As shown in the figure, a pair of endless belts 12a and 12b that move infinitely in the direction of arrow p in the figure are arranged in the heat treatment furnace 9. And this endless belt 12
a and 12b have a regular mesh pattern as illustrated in FIG.

The elongated body 1 ' having passed through the guide 6 passes through the heat treatment furnace 9 while being sandwiched by the pair of endless belts 12a and 12b.
Is converted to At this time, the thermosetting resin on the surface is thermoset in a state in which the network pattern of the endless belt is embedded therein. Then, at the time of leaving the heat treatment furnace 9, the upper and lower endless belts 12a and 12b are separated from the surface of the FRP. As a result, protrusions are formed on the surface of the obtained reinforcing member 1 as projections corresponding to the mesh pattern of the endless belts 12a and 12b.

Next, a fourth manufacturing method will be described. In this method, the elongate body on which the projections are to be formed is F
The long body of the RP itself is used. That is, an uncured thermosetting resin is applied to the surface of an FRP having a resin cured product as a matrix so as to have a desired thickness, and is sandwiched between endless belts 12a and 12b as shown in FIG. 9 through.

The thermosetting resin applied to the surface is thermoset in a state where the network pattern of the endless belt is engaged. Then, at the time of exiting from the heat treatment furnace 9, the endless belt separates from the layer of the cured resin on the surface, so that the surface of the obtained reinforcing material is provided on the surface of the reinforcing material in the same manner as in the third manufacturing method. A projection group corresponding to the mesh pattern of the endless belt is formed.

In the fourth manufacturing method, the elongated body on which the projections are to be formed on the surface is the FRP itself after the curing of the matrix resin is completed. The advantage is that even slight bending of the reinforcing fiber bundle which may occur with crimping of the body does not occur at all. The third manufacturing method and the fourth manufacturing method are suitable for being applied to the manufacture of a flat reinforcing material having a rectangular shape having a vertical / horizontal length ratio of less than 0.8 in a cross section.

FIG. 7 is a sectional view taken along the line VIII--VIII of FIG. 7, and FIG. 8 shows another embodiment. The reinforcing member B of this embodiment is a cylindrical body, and the projections as described above are formed on the outer surface, and the projections are not formed on the inner surface. This reinforcing material B can be manufactured by the above-described fifth manufacturing method. That is, as shown in FIG. 9, the mandrel 13 is set on a winding device 14 including a mandrel 13 that is rotatable about an axis and a traverse guide mechanism 14 a that can reciprocate in parallel with the mandrel 13. Thermosetting resin impregnated bundle 1
5 is wound.

First, the fiber bundles aligned in one direction are bundled, immersed in an uncured thermosetting resin 4, and the thermosetting resin 4 is impregnated into the fiber bundles. The impregnated resin is squeezed to form a thermosetting resin-impregnated fiber bundle 15. At this time, the content of the fiber bundle is adjusted to 40 to 80% by volume, as in the case described in the first manufacturing method.

The thermosetting resin-impregnated fiber bundle 15 is supplied to the mandrel 13 and the traverse guide mechanism 1
The resin-impregnated fiber bundle 15 being wound is pressed and wound around the mandrel 13 by the pressure roller 14b attached to the mandrel 4a. The winding mode of the resin-impregnated fiber bundle 15 at this time is not particularly limited, and is selected so that the strength of the finally obtained FRP cylinder can be adapted to the purpose of use. For example, first, the resin-impregnated fiber bundle 15 is wound at an angle of 75 to 88 ° with respect to the axial direction of the mandrel,
Furthermore, after winding at an angle of 1 to 20 °, ±
A preferred embodiment is to wind in a 45 ° direction and wind again at an angle of 75 to 88 °.

Next, a mesh having a regular mesh pattern is wound around the outside of the wound resin-impregnated fiber bundle without gaps. After the winding of the net, the mandrel is removed from the winding device, and the whole is heated in a heat treatment furnace, so that the impregnated resin of the resin-impregnated fiber bundle is thermoset. Then, by peeling the wound net and removing the mandrel, a projection group corresponding to the mesh pattern of the net is formed on the outer surface of the obtained FRP cylinder. Examples of the net include a knitted or woven fabric of organic fibers as used in the first to fourth production methods.

The size and shape of the mesh pattern of the net are not particularly limited, but are preferably, for example, polygonal or circular with a yarn bundle density of 2 to 46 yarns / cm. If the size of the mesh pattern is too small, the adhesion to the concrete becomes weak, and if it is too large, the projections formed on the surface of the cylindrical body become sparse, which also causes a decrease in the adhesion to the concrete. is there.

In the case of this reinforcing material B, the height of the projection formed on the surface is preferably about 0.05 to 2 mm. If the thickness is less than 0.05 mm, the engagement with the concrete is poor, causing a decrease in the adhesive force. If the thickness is more than 2 mm, breakage of the projections occurs frequently. Further, in the reinforcing material B, the thickness and the wall thickness are changed depending on the application place.
000 mm, and the thickness is set to 5-300 mm.

In the case of a cylindrical reinforcing member having a thickness of less than 30 mm, the dimension is similar to a solid reinforcing bar, but in this case, the solid reinforcing bar has higher performance. Thickness 5
Thicknesses larger than 000 mm are excessively designed in view of the strength of a general building design, and also reduce the effective space in the building and deteriorate the handling. Further, a material having a thickness of less than 5 mm is fragile as a reinforcing material. For example, when an external impact is applied, partial destruction of the cylindrical reinforcing material may occur. Then, not only the handling and the workability are deteriorated, but also the overall manufacturing cost is increased.

FIG. 10 and FIG. 11, which is a sectional view taken along the line XI-XI in FIG. 10, show still another embodiment. The reinforcing material C 'of this embodiment is a cylindrical reinforcing material like the reinforcing material B as shown in FIGS. 7 and 8, but the protrusion group 2 is also formed on the inner surface. . This cylindrical reinforcing material C is manufactured by a sixth manufacturing method.

That is, first, in the winding device shown in FIG. 9, a net having a mesh pattern corresponding to the projections to be formed on the inner surface is wound around the surface of the mandrel 13 without gaps. Thereafter, in the same manner as in the fifth manufacturing method, the winding of the resin-impregnated fiber bundle and the mesh having a mesh pattern corresponding to the projections to be formed on the outer surface are wound without gaps.

Then, by removing the mandrel from the winding device and heating the whole in a heat treatment furnace,
The impregnated resin of the resin-impregnated fiber bundle is thermally cured. Next, the mandrel is pulled out, and the net wound around the mandrel and the net wound around the entire surface are peeled off. As a result, a projection group corresponding to the mesh pattern of each mesh used is formed on the outer surface and the inner surface of the obtained FRP cylinder.

The method of manufacturing the cylindrical reinforcing members B and C is not limited to the fifth and sixth methods described above. For example, a prepreg is wound around a rotatable mandrel by a sheet wind method. A method of forming projections with a mesh on the front or back surface of the cylinder, winding a prepreg around a mandrel, placing it on a table that can be moved back and forth, left and right, and using the same material as the table A method of forming a cylinder by a rolling table method in which the cylinder is slid while holding it with a plate of the same size, and in this case, a method of forming a projection group with a mesh on the front surface or the back surface of the cylinder.

Further, the resin-impregnated fiber bundle is bundled into a cylinder using a guide, then passed through a cylindrical heating die, shaped into a cylinder, and then wound around the same resin-impregnated fiber bundle for reinforcement. After that, a pultrusion method of curing the matrix resin is applied, and in this case, a method of forming a projection group with a mesh on the front surface or the back surface of the cylinder may be adopted. And
The cross-sectional shape of the reinforcing members B and C is not limited to a circle, and may be, for example, an ellipse, a triangle, a polygon, or a star. Their cross-sectional shape can be formed by any of the above-mentioned filament winding method, sheet winding method, rolling table method, and pultrusion method. In addition, the end of the FRP plate is bonded with a resin. As a result, the desired cross-sectional shape can be obtained.

[0048]

【Example】

Example 1 In the production line shown in FIG.
B-12K-50B (trade name, average single yarn diameter: about 7 μm,
Single yarn number: 12,000, carbon fiber manufactured by Toray Industries, Inc.) 75
The fiber bundle made of the book is continuously immersed in “Epicoat” EP-827 (trade name, epoxy resin manufactured by Yuka Shell Epoxy Co., Ltd.) 4 containing a curing agent and a curing accelerator, and then the elongated body 1 ′ I made it.

On the outer side of the elongated body 1 ', a knitted (20 mm wide) polyester fiber having a thickness of 0.5 mm and a yarn bundle density of 5 / cm coated with a Teflon-based release agent is spirally wound. After winding through a heat treatment furnace 9 at a temperature of 140 ° C., the knitted fabric is wound up by a winding bobbin 10 to obtain a solid FRP.
A reinforcing bar 1 was obtained. The tensile strength of the obtained reinforcement is 165 kg
f / mm ² .

Further, regarding the reinforcing bars, the standard of the Japan Society of Civil Engineers (“Method of adhesion test of reinforced concrete by pull-out test (draft)” (published by the Japan Society of Civil Engineers, Concrete Library No. 72, “Concrete Structure of Continuous Fiber Reinforcement”) Application to Objects ”, pp. 57-59), and the adhesive strength to concrete was measured to be 140 kgf / cm ² .

Example 2 Lace knitting of polyester fiber (thickness 0.3 mm, yarn bundle density 4
Book / cm) as a reticulated body and attached to the surface of a long body,
In the heat treatment furnace, a solid FRP reinforcing bar was manufactured in the same manner as in Example 1 except that the resin curing and the overall shaping were performed simultaneously. The tensile strength of the reinforcement is 170kgf / mm ^2, also adhesion strength between the concrete was 125kgf / cm ^2.

Comparative Example 1 A heat-resistant tape was wound around the long body 1 'in Example 1 without any gap, and the whole was passed through a heat treatment furnace at a temperature of 140 ° C. to produce a solid FRP reinforcing bar. Although the tensile strength of this reinforcing bar was 178 kgf / mm ² , the adhesive strength with concrete was 30 kgf / cm ² , which was much lower than that of the example.

Comparative Example 2 A fluororesin filament having a circular cross section was helically wound at a depth of 2.0 mm and a pitch of 20 mm around the elongated body 1 ′ of Example 1. The whole was passed through a heat treatment furnace at 140 ° C., and then this filament was unwound to produce a solid FRP reinforcing bar having a spiral concave portion formed on the surface.

The adhesive strength of the reinforcing bar to concrete was 160 kgf / cm ² , which was superior to that of Example 1. However, the tensile strength of the reinforcing muscle itself is 90kgf / mm ^2,
The value was significantly lower than that of Example 1. Embodiment 3 As shown in FIG. 9, “Treca” T300B-12K-
50B are passed through 10 guides, and are immersed in “Epicoat” EP-827.
After removing the excess resin, the resin-impregnated fiber bundle 15 was wound around a mandrel 13 having a diameter of 70 mm set in a winding device.

At this time, initially, 87
2 ply winding from the surface layer of the mandrel 13 at an angle of °, then 2-ply winding at an angle of ± 45 ° with respect to the axial direction, and further 2-ply winding at an angle of 10 ° with respect to the axial direction. Two plies were wound at an angle of ± 45 ° with respect to the direction. Then, from above the wound layer of the resin-impregnated fiber bundle, a width of 30 mm, a thickness of 0.3 mm, and a yarn bundle density of 4 yarns / cm.
A tape-shaped polyester lace knit having a mesh pattern was wound.

The mandrel was removed from the winding device and placed in a hot air circulating curing oven at a temperature of 140 ° C. to advance the curing of the resin. Then, pull out the mandrel and set the inside diameter to 70.
mm, an outer diameter of 74 mm and a wall thickness of 2 mm were obtained, and the outer braid was peeled off to obtain a reinforcing material B as shown in FIGS. 7 and 8.
I made it.

This cylindrical reinforcing material B is formed by
Placed at the center of a 4000mm high formwork, formwork and reinforcement B
For the concrete bending test, pour concrete containing water / cement ratio of 60%, fine aggregate of Toyoura standard sand, coarse aggregate of crushed stone specified by JISA5005, and admixture of high-performance AE water reducing agent in the space between Sample. This sample was subjected to a bending test with a monotonically increasing load by a one-point concentrated one-way loading method, and the bending strength and the amount of deflection were measured.

The flexural strength of this sample was 8,800 kgf, and the amount of deflection was 5.5 mm. The flexural strength of concrete alone is 1500kgf, and the deflection is
It was 1.1 mm. Comparative Example 3 One reinforcing bar obtained in Comparative Example 2 was placed in the same formwork as in Example 3, and then the same concrete as in Example 3 was cast to obtain a sample for a concrete bending test.

The flexural strength of this sample was 6500 kgf,
The amount of deflection was 5.2 mm.

[0060]

As is clear from the above description, since the reinforcing material of the present invention is made of FRP, it is lightweight, easy to transport and work, and has excellent durability against salt damage and the like. As a matter of course, since the tensile strength and the bending strength themselves are excellent, and the adhesive strength with concrete is large, the industrial value thereof is great as a reinforcing material for concrete buildings.

[Brief description of the drawings]

FIG. 1 is a side view showing one example of a reinforcing material of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a partially enlarged view of a circle III in FIG. 1;

FIG. 4 is a schematic view showing one example of a production line for implementing the method of the present invention.

FIG. 5 is a plan view showing an example of a mesh used in the method of the present invention.

FIG. 6 is a schematic view showing another production line for carrying out the method of the present invention.

FIG. 7 is a side view showing another example of the reinforcing material of the present invention.

8 is a sectional view taken along the line VIII-VIII in FIG.

9 is a schematic perspective view showing an example of a winding device used for manufacturing the reinforcing member of FIG.

FIG. 10 is a side view showing still another example of the reinforcing member of the present invention.

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long body (reinforcing material) of fiber reinforced resin composite material 1a Reinforcing fiber 1b Cured resin (matrix) 2 Projection group 2a Projection 2b Slope surface of projection 2a 2c Surface of resin cured material layer 3a, 3b, 3c Roller 4 Heat Curable resin 5 Resin tank 6 Guide 7 Reticulated body 7a Network pattern 7b Network pattern connecting portion 8 Delivery bobbin 9 Heat treatment furnace 10 Winding bobbin 11 Pulling device 12a, 12b Endless belt 13 Mandrel 14 Winding device 14a Traverse guide mechanism 14b Pressure contact roll 15 Resin impregnated fiber bundle 16 Rubber nip roller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-156363 (JP, A) JP-A-4-224154 (JP, A) JP-A-3-33045 (JP, A) JP-A 55-156 149162 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) C04B 32/02 B28B 23/02

Claims (12)

(57) [Claims] 1. A reinforcing material for an inorganic material, wherein a group of projections having a regular network pattern are formed on the surface of a long body made of a fiber-reinforced resin composite material. 2. The elongate body is a solid body or a cylindrical body,
The reinforcing material for an inorganic material according to claim 1. 3. The reinforcing material for an inorganic material according to claim 1, wherein a rising angle of the projection with respect to a surface of the elongated body is 45 ° or less. 4. The height of each projection is 2 mm or less, and
The sum of the areas of the cut surfaces appearing when the projection is cut at a position of 1/2 of the average height is 2% of the total surface area of the elongated body.
The reinforcing material for an inorganic material according to claim 1, wherein the reinforcing material is at most / 3. 5. A net having a regular mesh pattern is pressure-bonded to the surface of a long body made of a composite material of a reinforcing fiber and an uncured or semi-cured thermosetting resin. A method for producing a reinforcing material for an inorganic material, comprising: after curing a resin, removing the mesh. 6. A surface of a long body made of a composite material of a reinforcing fiber and an uncured or semi-cured thermosetting resin is pressed with a net having a regular mesh pattern, and then subjected to a shaping treatment. And a method of producing a reinforcing material for an inorganic material, comprising: curing the thermosetting resin and then peeling the reticulated body. 7. The method for producing a reinforcing material for an inorganic material according to claim 6, wherein the thermosetting resin is cured simultaneously with the shaping process. 8. The thermosetting resin while sandwiching a long body made of a composite material of a reinforcing fiber and an uncured or semi-cured thermosetting resin between a pair of endless belts having a regular mesh pattern. A method for producing a reinforcing material for an inorganic material, comprising: 9. An uncured thermosetting resin is applied to the surface of a long body made of a fiber-reinforced resin composite material, and then the thermosetting resin is sandwiched between a pair of endless belts having a regular mesh pattern. A method for producing a reinforcing material for an inorganic material, comprising curing a conductive resin. 10. After winding a thermosetting resin-impregnated fiber bundle around a mandrel by a filament winding method, a net having a regular mesh pattern is wound thereon, and then the thermosetting resin is wound. A method for producing a cylindrical reinforcing material for an inorganic material, comprising, after curing, removing the mandrel and removing the mesh. 11. A thermosetting resin-impregnated fiber bundle is wound by a filament winding method on a mandrel on which a net having a regular mesh pattern is wound, and a net having a regular mesh pattern thereon. And then curing the thermosetting resin, and then removing the mandrel and separating the outer and inner meshes from each other, the method for producing a cylindrical reinforcing material for an inorganic material. 12. A concrete structure reinforced with the reinforcing material according to claim 1, 2, 3, or 4.