JPH0424502B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Technical field of the invention The present invention relates to columns, beams, etc. of reinforced concrete structures.
The present invention relates to a structural composite material suitable for use in place of main reinforcing bars and shear reinforcing bars in walls, floor slabs, etc. (b) Technical background In reinforced concrete, the concrete supports compressive force and the reinforcing steel supports tensile force. (c) Prior art and problems Figure 5 is a plan view of a conventional reinforced concrete structural member, and Figure 6 is a front view of Figure 5. Conventionally, reinforced concrete structural members 1 have iron main bars 2 and shear reinforcing bars 3 installed in concrete 9, as shown in Figs. In order to achieve this, a sufficient thickness of concrete is required, which is disadvantageous in that it increases the weight of the building and consumes more concrete. Furthermore, when the diameter of conventional reinforcing bars increases, the workability of processing and reinforcing bars becomes extremely difficult due to their weight and stiffness against bending. In addition, Japanese Patent Publication No. 51-53071 discloses a concrete reinforcing wire material in which glass fibers are placed inside and carbon fibers are placed outside and hardened with resin. When the wire is used as a main reinforcement, especially a shear reinforcement, when the wire is bent, the resin that hardens the fibers, which do not have self-retention properties, is destroyed and buckles at the bent portion. High risk. (d) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention provides a material that does not buckle even when bent, is lightweight, easy to process and rebar, and has sufficient fire resistance. The purpose of this project is to provide a structural composite material. (e) Structure of the Invention That is, the present invention has a core material made of a metal capable of plastic deformation and having an uneven surface, and a continuous fiber made of a continuous yarn of aramid fiber is attached to the core material. It is arranged in the axial direction of the material. Further, the present invention has a core material made of a metal capable of plastic deformation and having an uneven surface, and continuous fibers made of continuous yarns of carbon fibers are arranged in the core material in the axial direction of the core material. provided and configured. (f) Embodiments of the invention Hereinafter, embodiments of the invention will be specifically described based on the drawings. Figure 1 is a plan view showing a reinforced concrete structural member using the structural composite material of the present invention, Figure 2 is a front view of Figure 1, and Figure 3 is an embodiment of the structural composite material of the present invention. FIG. 4 is a diagram showing another embodiment of the present invention. The reinforced concrete structural member 5 has four main reinforcements 6, as shown in FIGS. 1 and 2.
A shear reinforcing bar 7 is spirally wound around each main reinforcing bar 6 so as to connect the main bars 6 to each other. The main reinforcement 6 and shear reinforcement 7 are covered with concrete 9, and the concrete 9 supports the compressive force generated in the reinforced concrete composite member 5, and the main reinforcement 6 and shear reinforcement 7 support the tensile force generated in the reinforced concrete composite member 5. . The main reinforcing bars 6 and the shear reinforcing bars 7 are made of a structural composite material 10 according to the present invention shown in FIG. It has a rod-shaped core material 11 made of metal such as. Irregularities 11a are formed on the surface of the core material 11, giving it a so-called irregular shape. In addition, the core material 11 has continuous threads of high-performance fibers, such as carbon fibers and aramid fibers, which have better mechanical strength than iron, do not rust, and have a light specific gravity in the directions of arrows A and B, which are the axial directions of the core material 11. A large number of high-performance continuous fibers 12 are wound together with the core material 11 in the form of a single rope (or braid). Since the reinforced concrete structural member 5 has the above configuration, when pouring and forming the reinforced concrete structural member 5, first, the structural composite material 10 is
is installed as the main reinforcement 6, and then the installed main reinforcement 6
A structural composite material 10 having a similar configuration is installed as shear reinforcing bars 7 so as to be wrapped between the installed main bars 6. When installing the shear reinforcing bars 7, the high-performance continuous fibers 12 of the structural composite material 10 are extremely flexible and can be deformed freely, so the bending process is easier than when using iron reinforcing bars. It is almost sufficient for the worker to simply bend the core material 11 by hand. Moreover, since the structural composite material 10 is maintained in the bent state by the core material 11 (that is, when the core material 11 is plastically deformed, the high-performance continuous fibers 12 are also deformed, and the deformed state is ), after concrete 9
There is no possibility that the shear reinforcing bars 7 will be displaced from the predetermined installation position until the concrete is placed. Furthermore, when installing the main reinforcement 6, by appropriately setting the bending rigidity of the core material 11, it can be installed in an independent form, similar to when the main reinforcement 6 is made of reinforcing steel (of course, the bending The stiffness is in any case higher than that of high performance continuous fibers 12). Note that after the concrete 9 is placed, the high-performance continuous fibers 12 that do not rust support the tensile force generated in the reinforced concrete composite member 5.
It does not require much mechanical strength as it can stand on its own together with the high-performance continuous fibers 12, and even if the core material 11 rusts after concrete is placed, the strength of the reinforced concrete composite member 5 is not affected at all. Table 1 shows a comparison of the mechanical properties of carbon fiber and aramid fiber as the high-performance continuous fiber 12.
As shown in Table 1, high-performance continuous fibers have a Young's modulus (modulus) comparable to that of steel, and their tensile strength is several times that of steel, but their density is

[Table] Extremely lightweight at 1/4 to 1/5. Therefore, by appropriately combining a metal core material and high-performance continuous fibers, it is possible to easily form a structural composite material 10 that has the same strength as conventional reinforcing bars and is lightweight. Further, by providing the unevenness 11a on the surface of the core material 11, the integrity of the structural composite material 10 and the concrete 9 can be sufficiently ensured. In this way, sufficient integration of the concrete 9 and the composite material 10 can be ensured by variously devising the installation form between the high-performance continuous fibers 12 and the core material 11. In addition, although the above-mentioned example described the case where the high-performance continuous fiber 12 was formed in the shape of a rope together with the core material 11, various ways of installing the high-performance continuous fiber 12 with respect to the core material 11 can be considered. for example,
Of course, as shown in FIG. 4, high-performance continuous fibers 12 may be wound around the core material 11. Furthermore, although the above-mentioned embodiment describes the case where the structural composite material 10 according to the present invention is used for constructing the reinforced concrete composite member 5, the structural composite material 10 according to the present invention is limited to the use for constructing the reinforced concrete composite member 5. It can also be used as a substitute for PC steel wires and bars when placing precast concrete, and as a support rope for suspension bridges. In addition, the surface of the structural composite material 10 is coated with a resin or the like for the purpose of improving workability during installation and effectively preventing accidental damage during installation of the high-performance continuous fiber 12. It is also effective to keep (g) Effects of the Invention As explained above, according to the present invention, the core material 11 is made of a plastically deformable metal such as iron and has an uneven surface, and the core material is made of aramid. Continuous fibers such as high-performance continuous fibers 12 made of continuous fibers are provided in the axial direction of the core material such as in the directions of arrows A and B, so it is much lighter than iron and has high mechanical strength. It becomes possible to provide the structural composite material 10. Moreover, the core material 11 not only allows the structural composite material 10 to stand on its own and maintain its deformed state as in the case of conventional reinforcing bars, but also because continuous fibers are easy to bend and cut. As a substitute, it is possible to provide a structural composite material 10 that is extremely lightweight, has high strength, and has good workability and construction properties. In addition, since the core material is made of a metal that can be plastically deformed, the core material imparts toughness to the structural composite material, and even when bending is performed, it does not sit as if the fibers were simply hardened with resin. Never give in,
It becomes possible to demonstrate a high degree of workability. Furthermore, since the surface of the core material has irregularities, it is difficult to make concrete 9 due to the smoothness of the surface, which is typical of continuous fibers made of continuous aramid fibers.
The unevenness can prevent the occurrence of poor adhesion with the material, making it possible to provide a structural composite material that has high mechanical strength, is lightweight, and has excellent adhesion. Furthermore, when carbon fiber is used as the continuous fiber, the mechanical strength deteriorates less at high temperatures than iron (that is, it has good fire resistance), so the structural composite material 10 supports the tensile force of concrete. Concrete 9 when used in place of reinforcing bars as a member
The thickness of the steel reinforcement can be made thinner than that of conventional steel structures, making it possible to reduce the weight of buildings and save on materials. In addition, by using a hollow pipe-like member as the core material 11 and passing cooling water such as water through the core material 11, it is sufficiently safe even if a material with some fire resistance problems is used as a continuous fiber. It is possible to ensure sex.

[Brief explanation of drawings]

Figure 1 is a plan view showing a reinforced concrete structural member using the structural composite material of the present invention, Figure 2 is a front view of Figure 1, and Figure 3 is an embodiment of the structural composite material of the present invention. 4 is a diagram showing another embodiment of the present invention, FIG. 5 is a plan view of a conventional reinforced concrete structural member, and FIG. 6 is a front view of FIG. 5. 10... Structural composite material, 11... Core material, 12...
...High performance continuous fiber, A, B...Axis direction.

Claims (1)

[Scope of Claims] 1. A core material made of a plastically deformable metal and having an uneven surface, wherein continuous fibers made of continuous aramid fibers are attached to the core material in the axial direction of the core material. Structural composite material constructed by providing. 2. A structure made of a metal capable of plastic deformation and having a core material with unevenness formed on the surface, and in which continuous fibers made of continuous threads of carbon fiber are provided in the axial direction of the core material. Composite materials.