JPH06297591A - Production of concrete reinforcing material made of frp - Google Patents

Abstract

PURPOSE:To continuously produce a concrete reinforcing material made of FRP having uneven parts enhancing the bonding strength with concrete provided thereto without lowering strength. CONSTITUTION:Fiber bundles 1 are passed through a resin bath 5 to be impregnated with a matrix resin 2 to be introduced into a heating mold 6 to semi-cure the matrix resin and the semi-cured fiber bundles are covered with a polyethylene tube 3 by a flexible tube covering machine 7 and unevenness for enhancing the bonding strength with concrete is formed on the surface of the polyethylene tube 3 by a molding gear 8. Since fibers are not cut at the time of formation of unevenness, the strength of the fiber bundles is not lowered. Thereafter, the surface of the polyethylene tube is cooled by a cooler 12 and the covered fiber bundles are taken up by a taking-up machine 13 and wound around a bending molding mandrel 11 to be cured and the cured tube is detached from the mandrel 11 to obtain a bent concrete reinforcing material made of FRP.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a FRP concrete reinforcing material such as a stirrup bar and a hoop reinforcing bar, and a method for manufacturing a straight FRP concrete reinforcing material.

[0002]

2. Description of the Related Art Conventionally, steel materials have been generally used for stirrup reinforcements, hoop reinforcements, straight reinforcements, etc., which are concrete reinforcing materials. The conventional bending bar is made by cutting a bar-shaped steel material with irregularities on the surface and bending it into the required shape to produce stirrup bars one by one, and this bent steel bar is called a bar bar (straight bar). It is assembled and embedded in concrete to make reinforced concrete. However, in recent years, sea sand has been used for mixing concrete in order to reduce river sand, and since sea sand contains salt, etc., when used as reinforced concrete, corrosion of steel materials easily occurs. . Corrosion of steel material causes cracking of concrete in a building and remarkably lowers the durability of the building. Therefore, in recent years, a FRP concrete reinforcing bar having no corrosive property has been used.

A conventional method of manufacturing a stirrup streak, a hoop streak, etc., which is made of FRP and is bent, is disclosed in Japanese Utility Model Laid-Open No. 63-162024 as follows. FIG. 14 is an explanatory view of the process, in which the bundle 30 of high-strength and low-elongation fibers is impregnated with the matrix resin 2 through the resin bath 5, passed through the shaping die 31, and the desiccant tank 32.
The powder desiccant is applied to the bundle 30 and the entire surface of the bundle 30 is covered with another fiber or synthetic fiber of the same material by the braiding machine 33, and a few of the fiber bundles in this state are twisted by the twisting machine 34. And wrap it around the mandrel 36, and
The matrix resin is completely cured by and is removed from the mandrel 36 to obtain a molded product as shown in FIG. 15 (a). Further, in the above-described manufacturing method, after winding another fiber of the same material on the surface of the twisted body at a predetermined pitch,
There is also a method in which this is wound around a mandrel 36, the matrix resin is completely cured by a heating device 35, and the mandrel 36 is removed to obtain a molded product as shown in FIG.

As a method for producing an FRP straight streak, a fiber bundle is impregnated with the matrix resin 2 and the matrix resin is heated and cured by a mold to obtain a rod-shaped streak. After that, as shown in FIG. 16 (a), a groove 41 is provided on the surface of the muscular body 40 by mechanical cutting or the like on the rod-shaped muscle to strengthen the connection with the concrete. In the straight streak shown in Japanese Utility Model Laid-Open No. 62-140115, a fiber bundle is impregnated with a thermosetting resin, and the thermosetting resin is heat-cured by a mold to obtain a bar-shaped streak. After that, as shown in FIG. 16 (b), a fiber bundle 43 of the same material is further wound around the bar-shaped streaks 42 at a predetermined pitch, impregnated with a thermosetting resin, and heat-cured to make unevenness, and straight streaks are formed. Manufacturing.

[0005]

In the conventional method for manufacturing a concrete reinforcing bar that is bent, such as a stirrup bar and a hoop bar made of steel, straight reinforcing bars are cut and bent one by one. It took a lot of time and effort. In addition, as a conventional method for manufacturing a FRP concrete reinforcing bar, the above-mentioned Japanese Utility Model Publication No. 63-16202 is used.
According to Japanese Patent Laid-Open No. 4 publication, the surface area of another fiber is increased so as not to lower the mechanical strength of the fiber serving as the core body of the muscular body, and the adhesive force to concrete is improved. BACKGROUND ART A fiber bundle is coated with another fiber, the fiber bundle is formed into a twisted body, and the fiber is wound around the surface of the twisted body in a band shape to manufacture a bent streak through a number of steps. This manufacturing method involves a large number of steps as described above and requires a great number of man-hours.

When unevenness is provided on the surface of the FRP concrete reinforcing bar, the fiber 44 on the outer periphery is cut during cutting as shown in FIG. Will decrease. Further, the concrete reinforcing bar made of FRP having unevenness disclosed in Japanese Utility Model Laid-Open No. 62-140115 has a core body molded, and a continuous fiber bundle of reinforcing fibers is spirally wound and impregnated with a thermosetting resin. Since the resin is heated and cured to be molded, the strength of the fiber itself does not decrease, but it is disadvantageous in that it requires many manufacturing steps and requires many facilities.

The present invention has been made by paying attention to the above-mentioned problems, and in the production of bent and straight reinforcements, continuous production can be performed without a large number of production steps, and concrete reinforcement and concrete can be produced. It is an object of the present invention to provide a method for producing a FRP concrete reinforcing material, in which uneven portions for obtaining adhesive force can be provided without causing a decrease in strength.

[0008]

To achieve the above object, in the first invention of the method for producing a concrete reinforcing material made of FRP according to the present invention, the fiber bundle impregnated with the matrix resin is partially mixed with the matrix resin. In a cured state, the semi-cured fiber bundle is covered with a flexible tube, the surface of the flexible tube is made uneven by a molding gear, and the flexible tube is wound around a mandrel for bending and molded and cured. In the second invention, the fiber bundle impregnated with the matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the fiber bundle is impregnated for molding. Unevenness is applied to the surface of the flexible tube, and the flexible tube is wrapped around a mandrel for bending and molded, and hardened. It was are characterized by a third
In the invention, the fiber bundle impregnated with the matrix resin is made to have the matrix resin in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and a tape-shaped covering material is cut into the flexible tube. Is wound around the flexible tube to form irregularities on the surface of the flexible tube, and the flexible tube is wound around a mandrel for bending and molded and cured. In the fourth invention, a fiber bundle impregnated with a matrix resin is used. The matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, a mandrel provided with irregularities on the surface, and a molding gear provided opposite the mandrel. Winding is performed on the bending mandrel with the uneven surface formed on the flexible tube. The fifth aspect of the present invention is characterized in that the fiber bundle impregnated with the matrix resin is made to be in a semi-cured state, and the semi-cured fiber bundle is subjected to flexi-flux. It is characterized in that the flexible tube is covered with a tube, and an unevenness is formed on the surface of the flexible tube by a gear for molding and cured. In the sixth invention, a fiber bundle impregnated with a matrix resin is formed into the matrix resin. In a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and unevenness is formed on the surface of the flexible tube by a marking for molding, and the flexible tube is cured. In
A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and a tape-shaped covering material is wound so as to bite into the flexible tube. In the eighth aspect of the present invention, the matrix resin is impregnated so that the matrix resin is in a semi-cured state. The semi-cured fiber bundle is characterized in that a granular substance is adhered to the surface of the semi-cured fiber bundle to be cured. In the ninth invention, the fiber bundle impregnated with the matrix resin is placed in a semi-cured state. Then, an adhesive is applied to the surface of the semi-cured fiber bundle, and a granular substance is adhered to the place where the adhesive is applied and cured. It is characterized in that.

[0009]

In the above manufacturing method, since the flexible tube is covered and cured when the matrix resin impregnated in the fiber is in the semi-cured state, the fiber bundle and the flexible tube are integrated, and the straight shape and bending The shape can be set freely. Also, gears, stamps,
Since the concavities and convexities are formed by coatings, granular materials, etc., the fibers are not cut, and the adhesive strength with various concretes can be obtained by changing the concavo-convex shape, and the shape of the mandrel can be changed. By doing so, bending lines of various shapes can be obtained.

[0010]

EXAMPLES Examples of the method for producing a FRP concrete reinforcing material according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a process explanatory view of the first embodiment, in which a carbon fiber bundle 1 which is a fiber bundle is passed through a resin bath 5 containing an epoxy resin 2 which is a matrix resin so as to be impregnated with an epoxy resin and a heating die 6 And heat it to a semi-cured state, and the flexible tube coating machine 7 coats the polyethylene (PP) tube 3 which is a flexible tube on this semi-cured fiber bundle, and a gear 8 for molding.
To form unevenness on the surface of the PP tube 3 for improving the adhesive force with the concrete, and the cooler 12 P
The surface of the P tube 3 is cooled, taken up by a take-up machine 13, wrapped around a PP tube with a mandrel 11 for folding and forming, and hardened, and removed from the mandrel 11 to obtain a bent line. The adhesive force between the bent bar and the concrete produced by this production method is 108 kg / cm ² when the specific surface area of the concave portion is 40% when the depth of the irregular portion is 0.2 mm.

FIG. 2 is a process explanatory view of the second embodiment, P
After coating the P tube, unevenness is formed on the surface of the PP tube 3 by the marking 9 for molding instead of the gear of the first embodiment, and the PP tube 3 is wound around the mandrel 11 and hardened to manufacture a bent line. Since the other parts are the same as those in the first embodiment, the description thereof is omitted. Hereinafter, the same applies to the fourth embodiment.

FIG. 3 is a process explanatory view of the third embodiment, P
After the P tube 3 is coated, the cloth tape 4 as a coating material is wound by the coating machine 10 so as to bite into the PP tube 3, and after irregularities are formed, it is wound around the mandrel 11 and cured to produce a bent line.

FIG. 4 is a process explanatory view of the fourth embodiment, where P
After the P tube 3 is covered, the bending mandrel 11 including the mandrel 14 having irregularities on the surface and the molding gear 8 facing the mandrel 14 is provided on the PP tube 3
It is wound and cured while forming irregularities on the surface of, to manufacture bent streaks.

5 to 7 are process explanatory views of the straight muscle. FIG. 5 is a process explanatory view of the fifth embodiment. As in the first embodiment, the surface of the PP tube 3 is made uneven by the gear 8 for molding, and the cooler 12 cools the surface of the PP tube 3. Then, the whole PP tube is cured to obtain a straight muscle.

FIG. 6 is a process explanatory view of the sixth embodiment. As in the second embodiment, unevenness is formed on the surface of the PP tube 3 by means of the marking 9 for molding, and the PP tube is cooled and cured. Get straight muscles.

FIG. 7 is a process explanatory view of the seventh embodiment. Similar to the third embodiment, the cloth tape 4 is wound around the surface of the PP tube 3 so as to bite into it to form irregularities and then cooled.
Hardens to get straight muscle.

FIG. 8 is a sectional view showing an example of a flexible tube coating machine 7 for continuously coating the semi-cured reinforcing fiber bundle with the PP tube 3 which is a flexible tube. 9 (a) and 9 (b) are muscular bodies manufactured by the manufacturing method of the present invention.

FIG. 10 is a process explanatory view of the eighth embodiment,
The carbon fiber bundle 1 is passed through a resin bath 5 containing an epoxy resin 2, impregnated with the epoxy resin 2, and then heated through a heating mold 6 so that the epoxy resin 2 is in a semi-cured state. Particles such as sand, glass particles, or particles with an adhesive, such as sand or glass particles, are attached to the entire surface by a sanding machine 21, heated by a heating machine 22, taken by a take-up machine 13, and cured. As a result, straight streaks with improved adhesion to concrete can be obtained. In addition, the above semi-cured product is heated by a heater 22
Bending lines such as hoop lines and stirrup lines can also be manufactured by picking them up with a take-up machine 13 without heating at 1, winding them around a bending mandrel, and curing them in an oven or the like.

FIG. 11 is a process explanatory view of the ninth embodiment,
An adhesive is applied to the entire surface of the semi-cured fiber bundle that has passed through the heating die 6 by an adhesive applicator 23, and particles such as sand and glass are attached by the sander 21. At this time, when the adhesive is applied in a band shape, a spiral shape, or a ring shape by the adhesive applicator 23, a semi-cured product having particles adhered only to this portion is obtained, whereby an arbitrary adhesion force with concrete can be obtained. Further, the effect of reducing the amount of the adhesive used without lowering the adhesive strength can be expected. After that, in order to cure only the adhesive, the adhesive is heated by the heater 22 and the take-up machine 1
It is taken up in step 3 and wound around a mandrel for bending and forming a bending streak. It is also possible to manufacture a straight streak by winding the particle-attached semi-cured product around a mandrel for bending and forming it, and taking it with a take-up machine 13 and curing it. Further, in the production of the straight streak, it is also possible to obtain a straight streak by heating the particle-adhered cured product with a heating machine 22 to a semi-cured product and taking it with a trading machine 13.

FIG. 12 is a process explanatory view of the tenth embodiment, in which the cured rod (fiber bundle) which has passed through the heating die 6 is manufactured in the same manner as in the ninth embodiment to produce a cured product having particles attached thereto. A straight line is obtained through the heating device 22 and the take-up device 13.

FIG. 17 is a process explanatory view of the eleventh embodiment, in which the carbon fiber bundle 1 is passed through a resin bath 5 containing a polyester resin which is an attrix resin, a mold 6 is passed through, and a fiber bundle is fed by a cooler. Then, the cured fiber bundle is covered with the PP tube 3, which is a flexible tube, by the flexible chews wearing machine 7, and then, in the same manner as in the first embodiment, irregularities are formed on the surface of the PP chews 3. While wrapping and curing, manufacture the bending streak.

FIGS. 13 (a) and 13 (b) are external views of straight streaks obtained by the manufacturing methods shown in the eighth to tenth embodiments, and FIG. 13 (a) shows a granular substance 20 attached in an annular shape. , (B) are those in which the particulate matter 20 is attached to the entire surface. (C) It is an external view of a bent line in which the granular material 20 is attached in an annular shape.

In the above eighth to tenth embodiments, it is possible to change the adhesive force with concrete by changing the size and density of the particles to be adhered. 3 above
In one embodiment, on a straight rod with a diameter of 8 mm,
Particles with a diameter of 0.075 mm and a diameter of 0.5 mm are attached,
As a result of measuring the concrete adhesion force per surface area, the following values were obtained.

Inorganic fibers such as carbon fibers and glass fibers, and organic fibers such as aramid fibers are used as the material of the muscles, and the matrix resin includes epoxy resin, unsaturated polyester, and phenol. A thermosetting resin such as resin or a thermoplastic resin such as nylon or polyester is used. When the thermosetting resin used here is a room temperature curable resin, the above-mentioned operations such as heating are omitted. Further, as the flexible tube, any flexible material such as polyethylene, polypropylene, nylon, vinyl, and silicon can be used, and the covering material has a string-like or tape-like shape. The material can be used without any particular designation. In short, as the fiber, the matrix resin, the flexible tube, and the coating, any material can be used as long as it can form the FRP material.
Further, the shapes of gears, markings, coatings, granules, etc. for forming the uneven portions and the positions of the gears, etc. can be freely changed depending on the shape of the muscular body.

[0025]

As described in detail above, according to the present invention, the matrix resin impregnated in the fiber bundle is made to be in a semi-cured state and covered with a flexible tube, and the flexible tube is coated with a coating material in the form of gears, stamps or tapes. Unevenness was formed and cured on the surface, or a granular substance such as sand and glass was adhered to the surface of the semi-cured fiber bundle and then cured to produce straight streaks or bent streaks. Conventionally, in order to increase the surface area, another fiber is put on the fiber bundle, and the fiber bundle is burnt,
Furthermore, many man-hours such as winding a fiber around the surface were required. However, in the method according to the present invention, the surface area of the fiber can be increased and the number of steps can be reduced by adding a simple structure such as wearing the flexible tube and adhering the granular material. Since it does not cut the reinforcing fibers of the FRP reinforcement, it has high tensile strength, and the adhesive force with concrete can be freely changed by changing the shape of the irregularities on the flexible tube surface, the amount of particulate matter attached, or the size and density of particles. By changing the shape of the mandrel, it is possible to obtain a method for producing a concrete reinforcing material made of FRP which can continuously produce bent lines of various shapes in a small number of steps.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a first embodiment of a manufacturing method of the present invention.

FIG. 2 is a process explanatory view of the second embodiment of the manufacturing method of the present invention.

FIG. 3 is a process explanatory view of the third embodiment of the manufacturing method of the present invention.

FIG. 4 is a process explanatory view of the fourth embodiment of the manufacturing method of the present invention.

FIG. 5 is a process explanatory view of the fifth embodiment of the manufacturing method of the present invention.

FIG. 6 is a process explanatory view of the sixth embodiment of the manufacturing method of the present invention.

FIG. 7 is a process explanatory view of a seventh embodiment of the manufacturing method of the present invention.

FIG. 8 is a cross-sectional view showing an example of a flexible tube coating machine used in the manufacturing method of the present invention.

FIG. 9 is a muscular body diagram manufactured by the manufacturing method of the present invention.

FIG. 10 is a process explanatory view of the eighth embodiment of the manufacturing method of the present invention.

FIG. 11 is a process explanatory view of the ninth embodiment of the manufacturing method of the present invention.

FIG. 12 is a process explanatory view of the tenth embodiment of the manufacturing method of the present invention.

FIG. 13 is a muscular body diagram manufactured by a manufacturing method according to eighth to tenth embodiments of the present invention.

FIG. 14 is a process explanatory diagram of a conventional manufacturing method.

FIG. 15 is a muscular body diagram manufactured by a conventional manufacturing method.

FIG. 16 is a muscular body diagram in which irregularities are formed on the surface by a conventional manufacturing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reinforcing fiber 22 Heating machine 2 Epoxy resin 23 Adhesive coating machine 3 PP tube 4 Coating 5 Resin bath 6 Heating die 7 Flexible tube coating machine 8 Gear 9 Marking 10 Coating machine 11 Mandrel 12 Cooling machine 13 Take-up machine 20 Granular material 21 Sanding machine

Claims (9)

[Claims] 1. A fiber bundle impregnated with a matrix resin is made so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the surface of the flexible tube is covered with a gear for molding. A method for producing a concrete reinforcing material made of FRP, which comprises forming unevenness, winding the mandrel for bending and molding, and curing. 2. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the surface of the flexible tube is marked with a marking for molding. A method for producing a concrete reinforcing material made of FRP, which comprises forming unevenness, winding the mandrel for bending and molding, and curing. 3. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and a tape-shaped covering material is cut into the flexible tube. The method for producing a concrete reinforcing material made of FRP, characterized in that the flexible tube is wound in such a manner that irregularities are formed on the surface of the flexible tube, and the flexible tube is wound around a mandrel for bending and molded and cured. 4. A mandrel having a fiber bundle impregnated with a matrix resin, wherein the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the surface has irregularities, and the mandrel. FRP concrete reinforcing material, characterized in that it is wound around a mandrel for bending and forming, which is provided with a gear for forming provided opposite to, while forming irregularities on the surface of the flexible tube, and is molded and cured. Manufacturing method. 5. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the surface of the flexible tube is covered with a gear for molding. FR characterized by having irregularities formed and cured
Method for manufacturing P concrete reinforcement. 6. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and the surface of the flexible tube is marked with a marking for molding. FR characterized by having irregularities formed and cured
Method for manufacturing P concrete reinforcement. 7. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, the semi-cured fiber bundle is covered with a flexible tube, and a tape-shaped covering material is cut into the flexible tube. A method for producing a concrete reinforcing material made of FRP, characterized in that the flexible tube is wound in such a manner that irregularities are formed on the surface of the flexible tube and then cured. 8. An FRP characterized in that a fiber bundle impregnated with a matrix resin is cured so that the matrix resin is in a semi-cured state, and a particulate substance is attached to the surface of the semi-cured fiber bundle. Manufacturing method of concrete reinforcement. 9. A fiber bundle impregnated with a matrix resin is set so that the matrix resin is in a semi-cured state, an adhesive is applied to the surface of the semi-cured fiber bundle, and the portion where the adhesive is applied is granular. A method for producing an FRP concrete reinforcing material, characterized in that a substance is adhered and cured.