JPH071127U - Reinforcing material for concrete - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a reinforcing material for a concrete, which has high strength and light weight, and also has good adhesion to the concrete. [Structure] A plurality of high-strength, low-elongation fibers are aggregated and a thermosetting resin is applied or impregnated on the filaments, and then a plurality of filament bodies 1 having a braided coating are twisted together to form a twisted body 1 '. The surface area increasing material 5 is wound around the outer periphery of the united body 1'at the uncured thermosetting resin stage. Then, the thermosetting resin is heat-cured to form an uneven portion 10 between the twisted structure and the surface area increasing material 5.
Was integrally formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reinforcing material for concrete.

[0002]

[Prior art and its technical problem]

As a concrete reinforcing material, for example, a reinforcing material for a prestressed concrete, a steel material such as a steel wire, a steel twisted wire and a steel rod has been generally used. However, these steel materials have high specific gravity and also have a problem of corrosion such as rust. Therefore, in recent years, it has been attempted to utilize non-metallic fibers such as carbon fibers as concrete reinforcing materials. Fibers with high strength and low elongation represented by this carbon fiber have higher strength (generally 250 to 700 kg / mm ² ) than steel materials, and also have a low specific gravity (about 1.8), so importance is placed on specific strength. It has excellent properties as a reinforcing material for concrete. By the way, it is necessary for the concrete reinforcing material to have a high adhesive force with the concrete. Therefore, in the concrete reinforcing material for steel material, indentation processing is performed to make indentations on the surface of the steel material. This processing is relatively easy for steel materials.

However, the concrete reinforcing material for high-strength, low-elongation fiber is composed of a texture of filaments, a synthetic resin is used for the texture, and the surface is substantially resin-coated. It is smooth, and surface treatment such as indentation on the filament is difficult to use because it significantly deteriorates the mechanical properties of the fiber. Therefore, there is a problem that the surface area is smaller than that of the reinforcing material made of steel, and the adhesive force with the concrete tends to be insufficient.

The present invention has been made by research to solve the above-mentioned problems. The purpose of the present invention is to have high strength and light weight, and also to have good adhesion to the concrete. It is to provide a reinforcing material for concrete.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is designed to increase the surface area of a high-strength low-elongation fiber without deteriorating the mechanical properties of the high-strength low-elongation fiber. The surface area increasing material is wound around the outer periphery of the twisted body obtained by twisting a plurality of filaments coated or impregnated with a thermosetting resin on the An uneven portion is integrally formed by the surface area increasing material by hardening a curable resin.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a first embodiment of a concrete reinforcing material according to the present invention, which comprises a twisted body 1'in which a plurality of filaments 1 made of high strength and low elongation fiber are twisted. The concavo-convex portion 10 is formed by winding the surface area increasing material 5 around the outer surface. More specifically, the filament 1 has a large number of high-strength and low-elongation fibers 1a such as carbon fibers, polyaramid fibers, glass fibers, and silicon carbide fibers as yarns or strands as shown in FIG. 2 (a). The core body 2 which is bundled, twisted or braided is impregnated or coated with a thermosetting resin 3 such as unsaturated polyester, epoxy or polyurethane, and powder such as talc is formed on the outer periphery as shown in FIG. 2 (b). It is made by applying a desiccant 4 to dry the surface, and then covering the outer circumference with a braided synthetic fiber such as polyester, nylon or the like or a high-strength low-elongation fiber. 4'is a braided body. Next, the filament 1 is formed into a twisted body 1 ′ having a required diameter by twisting a plurality of strands (for example, 7) while the inner resin is still uncured, and the inner resin is uncured and the outside of the twisted body 1 ′ is formed. The surface area increasing material 5 is wound around the circumference. Then, the internal resin is cured by heating. This results in the structure of FIG.

In this embodiment, the surface area increasing material 5 is a normal synthetic fiber such as nylon or polyester, or the above-mentioned high-strength low-elongation fiber is plain-woven or twilled as shown in FIGS. 3 (a) and 3 (b). The tape is continuously wound around the outer periphery of the twisted body 1 ′ at a constant pitch in a state where the thermosetting resin 3 inside is uncured. Since the tape has a woven structure, innumerable uneven portions are created at the same time by winding the tape. In the illustrated example, the surface area increasing material 5 is wound at a coarse pitch such that the surface of the twisted body 1'is periodically exposed, but the present invention is not limited to this, and the weaving tape is provided at each pitch. It may be tightly wound so as to be closely attached or appropriately wrapped.

FIG. 4 shows a second embodiment of the present invention, in which the surface area increasing material 5 is not a face material such as a tape but a normal synthetic fiber such as nylon or polyester, or the high strength and low elongation fiber. The linear body made of is used and wound around and integrated with the twisted body 1 '.

[0009]

[Operation of the embodiment]

 FIG. 5 schematically shows a manufacturing process until obtaining the filamentous body 1 of the reinforcing material for concrete of FIGS. 1 and 4, and the core body 2 made of high-strength and low-elongation fiber has a melt thermosetting property. The thermosetting resin 3 is impregnated by being passed through the resin tank 6 containing the resin 3, and then drawn out through a molding die 7 made up of a plurality of shaping dies arranged in a line to have a predetermined shape. Is added and the excess resin component is removed. Further, after the powder desiccant 4 is applied to the surface of the core body by being guided to the desiccant tank 8, it is passed through the braiding machine 11 so that the outer periphery is braided and covered with the braided body 4 ′. Becomes After that, each filament 1 is sent to a twisting machine to form a twisted body 1 ', which is then guided to a surface area increasing material winding machine 9, where a surface area increasing material 5 is set from above the twisted body 1'. Wrapped around the pitch. After that, the twisted body 1 ′ is passed through a heating tank set to a predetermined temperature atmosphere to cure the thermosetting resin inside, and serves as a concrete reinforcing material having uneven portions 10 on the surface. is there. This reinforcing material for concrete is not only used for prestressing concrete as it is long, but it is also used as a dispersed reinforcing fiber by cutting it into a short length such as 3 to 5 cm. be able to.

Since the concrete reinforcing material of the present invention has a high strength and low elongation fiber structure, it has advantages of high strength and light weight, and further, rust-free. Moreover, since the concrete reinforcing material of the present invention is not a simple linear or rod-like material but a twisted body 1'in which a plurality of filaments 1 are twisted together, it has a large surface area by itself. Further, since the filament 1 has a coating with the braid 4'on its outer periphery, and the surface area increasing material 5 is wound around the outer periphery of the twisted body 1'consisting of a plurality of filaments 1, Due to the spiral unevenness due to and the spiral unevenness due to the surface area increasing material 5 and the unevenness of the braided body 4 ′, the surface area amplification effect of three or more layers is obtained as a whole, and thereby the adhesion effect with concrete becomes high. . In addition, the filament 1 having high strength and low elongation fibers collected and coated or impregnated with a thermosetting resin cannot be applied to a twisting machine as it is because of the adhesiveness of the uncured resin. After coating, excess resin is removed with a die, and the braided body 4'is then applied to the outer periphery of the filament 1 so that the surface of the filament becomes almost dry fiber state. Therefore, a plurality of filaments 1 can be applied to a twisting machine to form a twisted body 1 '. Further, since the surface area increasing material 5 is wound around the twisted body 1'having such a dry surface, the work of constructing the surface area increasing material 5 is easy. Finally, the resin is cured, but the heating at this time lowers the resin viscosity and causes the resin to ooze out throughout the twisted structure, so that the twisted structure can be fixed and integrated with the surface area increasing material at the same time. The heating step is economical because it only needs to be done once. Moreover, in order to increase the adhesive force, a process for locally thinning the cross section of the reinforcing material such as indentation is not adopted, so that the mechanical properties of the high strength and low elongation fiber structure are not deteriorated, and High strength performance can be fully exerted.

[0011]

[Effect of device]

 In the case of the present invention described above, a twisted body 1 in which a plurality of high-strength low-elongation fibers are aggregated, and a plurality of filaments 1 having a braided coating applied or impregnated with a thermosetting resin are twisted together Since the surface area increasing material 5 is wound around the outer periphery of the thermosetting resin in the uncured stage, and the twisted structure and the surface area increasing material 5 are integrally formed by curing the thermosetting resin. In addition to the characteristic of being lightweight, the spiral unevenness due to the twisted structure overlaps with the spiral unevenness due to the surface increasing material 5 (or the surface unevenness of the surface increasing material 5 itself) and the unevenness due to the braid 4 ′. It has an extremely large surface amplification effect, can be used as a concrete reinforcing material with excellent adhesion to concrete, and has excellent effects such as a simple structure and high-efficiency production.

[Brief description of drawings]

FIG. 1 is an enlarged side view showing a first embodiment of a concrete reinforcing member according to the present invention.

FIG. 2 is a cross-sectional view showing a filamentous body in stages according to the present invention.

FIG. 3 is a partial plan view showing an embodiment of the surface area increasing material according to the present invention.

FIG. 4 is a side view showing a second embodiment of the present invention.

FIG. 5 is an explanatory view schematically showing the production process of the filamentous body in the concrete reinforcing material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stranded body 1'Twisted body 3 Thermosetting resin 4 Powder desiccant 4'Braid body 5 Surface area increasing material 10 Uneven portion

Claims (1)

[Scope of utility model registration request] 1. A concrete reinforcing material using high-strength, low-elongation fibers, wherein high-strength, low-elongation fibers are gathered and coated with or impregnated with a thermosetting resin, followed by braid coating. A surface area increasing material 5 is wound around the outer periphery of a twisted body 1'in which a plurality of filaments 1 are twisted at the thermosetting resin uncured stage, and the twisted structure and the surface area increasing material 5 are obtained by curing the thermosetting resin. A reinforcing material for concrete, characterized in that the uneven portion 10 is integrally formed with