JP2602163Y2 - Cement concrete reinforcement using fiber - 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 cement concrete, and more particularly to a fiber aggregate and a fiber reinforcing material for coping with tensile stress generated in cement concrete.

[0002]

2. Description of the Related Art Cement concrete has a strength (compressive strength) capable of coping with compressive stress by itself, but it has about one-tenth of compressive strength against tensile stress.
It has only a certain degree of tensile strength. Therefore, when a large tensile strength is required, such as when cement concrete is used as a structural material, a reinforcing bar that shares tensile stress is arranged and used as reinforced concrete.

[0003]

However, reinforced concrete has the following drawbacks. (1) Even if reinforcing bars are provided, the tensile strength of cement concrete itself cannot be improved. (2) When the tensile strength is increased, the amount of reinforcing steel is increased. However, the upper limit of the cross-sectional area of the reinforcing steel in the cross-sectional area of the concrete is 0.8% to 4%. Cross-sectional destruction is likely to occur. (3) Further, in such a case, a detachment phenomenon occurs between the reinforcing bar and the outside thereof (so-called cover).

Accordingly, an object of the present invention is to provide a reinforcing material for cement concrete , which can improve the tensile strength of cement concrete itself. Other issues that the present invention should solve are effective
That can share the tensile strength of cement concrete
To provide reinforcing bars for concrete .

[0005]

Means for Solving the Problems As means for solving the above technical problems, the present inventors have completed the following invention.
Done. That is, the present invention is applied to cement concrete.
A reinforcing material to be mixed, comprising a plurality of fiber yarns and charcoal
Providing reinforcing material that is a bundle of material and steel
I do. Further, in this reinforcing material, the bundle is formed of the fiber.
Weft and carbon steel material are mutually bonded and covered with synthetic resin
Provided reinforcements are also provided. The present invention is
Reinforcing bars that are placed on the cleats,
Reinforcement reinforcing material, which is a bundle of yarn and carbon steel, is provided.
You. Further, in the reinforcing bar, the bundle is plastic.
Is also provided. Further, the bundle is assembled.
It also provides reinforcing bars that are joined together to form a net.
You.

[0006] The cement concrete (hereinafter simply referred to as concrete) is obtained by mixing and hardening cement, water and aggregate.

[0007]

The cement concrete comprising the bundle of the present invention
Reinforcement material is evenly dispersed in concrete,
It bears the tensile stress on concrete. Also heel
When the bundle is covered with synthetic resin, cement
Wear of bundles is prevented during concrete mixing
You. A cement concrete supplement comprising the bundle of the present invention
The reinforcing bars share the tensile stress applied to the concrete.
Moreover, if it has plasticity, it is easy to bend. Further
In addition, construction is easy if it is in the form of a net.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fiber aggregate according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, the fiber aggregate 1 of the present embodiment is formed into a predetermined shape by a plastic 7 using a bundle 2 mainly composed of a plurality of fiber yarns 4 as a core material.

The bundle 2 is formed in a sliver shape in which a plurality of fiber yarns 4 and a carbon steel material 6 having a predetermined length are simply bundled in parallel without further twisting. Each fiber yarn 4
It is a spun yarn in which a plurality of monofilaments, the same kind of fibers are combined, or a spun yarn of different kinds of fibers. These fiber yarns 4
As the fibers used in the above, alkali-resistant fibers are used in consideration of stability in concrete because concrete is alkaline. Such fibers include, for example, inorganic fibers such as carbon fibers, silicon carbide fibers, and stainless steel fibers and organic fibers.

In particular, since the fibers used in this embodiment bear a large tensile stress, fibers having a tensile strength per unit area superior to that of a reinforcing steel used as a reinforcing steel material in reinforced concrete are used.

The carbon steel material 6 has the same length as the fiber yarn 4 and has predetermined elasticity and rigidity. That is,
This carbon steel material 6 is a bundle 2 mainly composed of fiber yarns 4.
The bundle 2 is bundled together with the fiber yarn 4 in order to impart elasticity, maintain a constant shape, and further increase the specific gravity of the bundle 2 to approximate the specific gravity of concrete.

The reason why the shape of the bundle 2 is maintained is to prevent the fiber aggregate 1 from curling in concrete.
This is for preventing aggregation and obtaining mixing uniformity. Also, the reason why the elasticity is imparted is that when the fiber aggregates 1 are entangled in the concrete, the fiber aggregates 1 are easily unwound and aggregation is prevented.
Furthermore, the specific gravity of the concrete is brought close to that of the concrete so that the fiber aggregate 1 does not float on the surface layer during the mixing of the concrete. This is for preventing and maintaining a good dispersion state. Therefore, considering the elasticity and the like of the carbon steel material 6, the carbon content of the carbon steel material 6 used is
0.6-0.7% is desirable.

As shown in FIG. 1, the fiber yarn 4 and the carbon steel material 6 are bundled in a substantially circular cross section by arranging one to several carbon steel materials 6 on ten or more fiber yarns 4. Exists as a bundle 2. The carbon steel material 6 is disposed at the center or the outermost side of the bundle 2 so as to be left-right symmetric. With such an arrangement position, elasticity in all directions can be obtained. The number of the fiber yarns 4 in the bundle 2 is determined in consideration of the required tensile strength. The number of carbon steel materials 6 is determined in consideration of the elasticity and specific gravity given to the fiber aggregate 1.

The bundle 2 is impregnated with the plastic 7 between the fiber yarns 4 and the carbon steel 6 so that
The fiber aggregate 1 is fixed to each other and is entirely covered with the plastic 7. The fiber aggregate 1 has a substantially rod shape having ball-shaped heads 8 at both ends, and the length thereof is equal to or less than the maximum length of the aggregate constituting the concrete. If it is larger than this maximum size, concrete can be mixed, poured, etc.
This is because there is a problem with mold clamping and the like.

The reason why the fiber aggregate 1 is formed by covering the bundle 2 with the plastic 7 is to prevent the fiber yarns 4 from being worn by the stirring blades or the like in the concrete mixer during mixing of the concrete. It is. That is, the plastic 7 only needs to be able to prevent the abrasion of the surface of the bundle 2 and maintain the shape of the bundle 2 at least until the concrete is usually mixed and poured. Therefore,
In particular, it can be used even if the plastic 7 is not strong in alkali resistance.

The head 8 of the fiber aggregate 1 corresponds to a hook of a reinforcing bar in reinforced concrete.
It is formed to further enhance the adhesive strength between the concrete and concrete. The plastic 7 used is one that covers and cures the bundle 2 to such an extent that the elasticity imparted to the bundle 2 by the carbon steel material 6 can be maintained.

Next, the operation when the fiber aggregate 1 thus formed is mixed with other aggregates in concrete will be described. First, during mixing of the concrete, the fiber aggregate 1 has a specific gravity close to that of the concrete due to the carbon steel material 6, so that the fiber aggregate 1 is uniformly mixed with other aggregates without floating on the surface layer. . At the same time, the carbon steel material 6 maintains a rod-like shape even during mixing, so that it is not rounded or entangled. Furthermore, since it is elastically deformable, it is possible to prevent entanglement between the fiber aggregates 1.

As shown in FIG. 2, when the mixed concrete is poured into a formwork, the same as at the time of mixing,
It is hardened while maintaining a uniform dispersion state with the aggregate in the mold. That is, since the fiber aggregate 1 in the hardened concrete is randomly and three-dimensionally dispersed, the concrete is given a tensile strength by the fiber thread 4 of the fiber aggregate 1. Further, since this concrete contains the fiber aggregates 1 in such a dispersed state, the concrete has a structure effective against an impact load from an unspecified direction such as an earthquake.

As described above, the fiber aggregate 1 of the present embodiment comprises the fiber yarn 4
A carbon steel material 6 is arranged on a bundle 2 mainly composed of a plastic material to maintain the shape of the aggregate during mixing, and
By impregnating the fiber aggregate, it is possible to exhibit the original characteristics of the fiber aggregate 1 in hardening concrete.

Further, since the fiber aggregate 1 imparts tensile strength to the concrete itself, the amount of reinforcing steel used as a reinforcing steel material can be reduced.

The fiber aggregate 1 having such characteristics is not limited to the rod shape described above, but may be a fiber aggregate 10 having the shape shown in FIG. The ring shape has the advantage that it acts as a surface while the tensile stress acts on the line like a bundle, and also prevents the fiber aggregates 10 from entangled with each other to ensure uniform mixing. It has the advantage of being easier. In the fiber aggregate 10, a predetermined number of fibers are wound so as to have a diameter smaller than the maximum aggregate size, and then carbon steel is processed by the same method to form an integral shape. The plastic is impregnated to maintain its shape. In addition, the shape of the fiber aggregate 1 can be adopted as long as it can obtain uniformity of mixing.

Next, an embodiment of the fiber reinforced material according to the present invention will be described with reference to FIGS. The fiber reinforced material 11 of the present example can replace a reinforcing bar which is conventionally used as a reinforcing material for concrete in general. In FIG.
The state where the fiber reinforced material 11 is combined and knitted on the net 13 is shown. Fiber aggregate 1 in the above embodiment
Is a method in which short fiber yarns 4 having a length of about several centimeters are dispersed into concrete as a bundle 2 and mixed therein. Is what you do.

Each fiber reinforcing material 11 constituting the net 13 is
It is composed of a plurality of fiber yarns similar to the first embodiment and a carbon steel material. For each fiber yarn, the same type of fiber yarn 4 as in Example 1 can be used, and as the fiber constituting the fiber yarn, the same type of fiber as described in Example 1 can be used. The number of fiber yarns in the fiber reinforced material 11 is a number corresponding to the required tensile strength.

Further, the carbon steel material is used to maintain the shape when the carbon steel material is disposed as a reinforcing material in the formwork 12, and
It is formed into a bundle 14 combined with fiber yarns in order to bend and process the continuous fiber reinforced material 11 on site. For this reason, the carbon content in the carbon steel material is preferably 0.08 to 0.12% in order to secure plasticity. The carbon steel material also gives specific gravity to the fiber reinforced material 11 to such an extent that it does not float in the mold 12 into which the concrete has been injected. Therefore, the number of carbon steel materials in the bundle 14 is such that plasticity and specific gravity can be ensured.

Such a fiber yarn and a carbon steel material are bundled in a substantially circular cross section as a whole, and a plurality of fiber yarns and a carbon steel material are twisted in a so-called braided form having no directivity. Thus, a bundle 14 is formed. Here, the braided shape means that each twisted yarn is not oriented in only one direction, and the twist is not easily unwound, and is twisted so that the bundle 14 does not expand when the twist is unwound. Is what you have. Therefore, the bundle 14 can also be formed by a bundling method or a processing method in which the bundle 14 does not expand even if it is not a so-called braid. In the bundle 14, the carbon steel materials are bundled and twisted so as to be uniformly distributed.

Such a bundle 14 is cut to a required length, and is used in a construction site, as shown in FIG. 4, to form a grid-shaped mesh net 13.
The contacts of the fiber reinforced material 11 in the net 13 are bonded by an alkali-resistant plastic 20.

As shown in FIG. 5, the fiber reinforced material 11 formed as described above is bent at a predetermined portion, and each contact is fixed by a ring clip or the like to form a mold 12.
Is placed in advance and concrete is poured. Since the fiber reinforcing material 11 in the hardened concrete has a larger tensile strength with a smaller cross-sectional area than the reinforcing bar, the area of the fiber reinforcing material 11 in the concrete cross section can be reduced, and sufficient covering can be obtained. Furthermore, it is possible to reduce the cross-sectional area of the structure itself.

Further, the fibrous reinforcing material 11 can be maintained in a constant shape by the carbon steel material, and can be stored and transported in a roll shape because it is provided with plasticity.
Then, in the construction of concrete, by appropriately cutting and bending along the shape of the formwork 12 at the site, it can be used according to the strength required as a reinforcing bar. In addition, since the fiber reinforced material 11 is very light as compared with the rebar, the above operation can be easily performed, and the transportation is also facilitated, so that the work load on the site can be reduced.

Further, when the fiber aggregate and the fiber reinforced material described in Example 1 and Example 2 are used in combination, the concrete concrete by the fiber aggregate and the fiber reinforced material can be subjected to an impact load from an unspecified direction. Also, it can be made to have high tensile strength against live load.

[0030]

[Effect of the invention] Reinforcing material for cement concrete of the present invention
According to the report, the tensile strength of cement concrete itself is improved
Can be done. In addition, the cement concrete
According to the reinforcing reinforcement for the sheet, cement concrete
Can share the tensile strength.

[Brief description of the drawings]

FIG. 1 is a diagram showing the appearance of a fiber aggregate and a bundle inside the fiber aggregate.

FIG. 2 is a diagram illustrating a dispersion state of fiber aggregates in concrete.

FIG. 3 is a view showing another embodiment of the fiber aggregate.

FIG. 4 is a diagram showing a state in which a fiber reinforced material is formed on a net.

FIG. 5 is a view showing a state in which a fiber reinforced material is disposed in a formwork.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fiber aggregate 2, 14 ... Bundle 4 ... Fiber thread 6 ... Carbon steel material 11 ... Fiber reinforced material 13 ... Net

Claims (5)

(57) [Scope of request for utility model registration] 1. A supplement to be mixed with cement concrete.
It is a strong material, bundled with a plurality of fiber yarns and a carbon steel material fixed
Reinforcement that is the body. 2. The bundle according to claim 1 , wherein the fiber yarn and the carbon steel material are
2. A method according to claim 1, wherein said resin is fixed to and covered with a synthetic resin.
Reinforcement as described. 3. Reinforcing bars provided in cement concrete
Reinforcement, which is a bundle of a plurality of fiber yarns and a carbon steel material
Wood. 4. The bundle according to claim 3, wherein said bundle has plasticity.
Reinforcement bars. 5. A net-shaped combination of said bundles.
The reinforcing reinforcing bar according to claim 3, wherein the reinforcing bar is formed.