JP2017227059A - Junction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and strong junction structure capable of suppressing a deterioration in appearance grade of a structure reinforced with the junction structure.SOLUTION: Characteristically, a junction structure includes: a first member that is made of a rod-like fiber-reinforced composite material composed of a plurality of wires; a second member that is arranged in such a way as to be superposed on an end of the first member or inserted thereinto; and a synthetic resin coating part that makes at least a part of an overlap portion of the first and second members joined by being coated with a synthetic resin.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a bonded structure using a rod-like fiber reinforced composite material.

The rod-like fiber reinforced composite material obtained by combining carbon fiber, aramid fiber, and other reinforcing fibers with resin is excellent in workability due to its light weight. Has been.
Since such rod-like fiber reinforced composites are joined to steel, wood, and concrete, the ends of the rod-like fiber reinforced composites are made of metal or resin rods that serve as fixing jigs via tubular joints. Bonded to the end of a bolt or the like, and joined to a joint having a nut or the like corresponding to the bolt and the bolt provided on the steel frame, or joined to the steel by welding, adhesive, string It was joined to steel frames, wood, etc. using strips and strips.

  Moreover, the rod-like fiber reinforced composite material in which the end portion of the rod-like fiber reinforced composite material is inserted into the tubular portion of a fixing jig made of metal or resin having a tubular portion and joined using a resin or the like, and the fixing jig is joined. Is welded to the steel frame via the fixing jig, or is bonded to the steel frame or wood using an adhesive, a bolt, a string, or a strip (for example, Patent Documents 1 and 2).

JP 2002-97746 A JP 2013-11163 A

However, when a fixing jig having a tubular joint or a tubular end portion is used, it has the following problems.
Since fixing jigs with steel tubular joints and tubular ends (hereinafter also referred to as steel pipes) are heavy, composite materials combining fiber-reinforced composites and steel pipes are The load is large. Also, when bonding steel pipe and rod-like fiber reinforced composite material with synthetic resin, because the adhesive strength of resin and steel pipe, resin and rod-like fiber reinforced composite material is different, unevenness is formed by cutting screws inside the steel pipe, It is necessary to improve the adhesive strength between the synthetic resin and the steel pipe, which increases the number of processes. Furthermore, when the steel pipe is used in a portion where it can be visually observed, there is a possibility that the aesthetic appearance of the structure is impaired.

  In addition, fixing jigs having tubular joints made of resin and tubular ends (hereinafter also referred to as resin pipes) are lighter than steel pipes, but have insufficient tensile strength such as tensile strength and breaking load. If a large force is applied, the rod-shaped fiber reinforced composite material will not be broken or the rod-shaped fiber reinforced composite material will not come out of the joint between the rod-shaped fiber reinforced composite material and the resin tube. was there. In order to prevent such breakage of the resin tube, it is necessary to make the resin tube thicker or longer, and there is a possibility that the aesthetic appearance of the structure is impaired like the steel tube.

  Therefore, an object of the present invention is to provide a joined structure that is lightweight and strong, and that can suppress deterioration in appearance quality of a structure reinforced with the joined structure.

The joined structure of the present invention includes a first member made of a rod-like fiber reinforced composite material composed of a plurality of strands, a second member that is placed on or inserted into an end of the first member, A joint structure comprising: a synthetic resin covering portion that covers and joins at least a part of an overlapping portion between the first member and the second member with a synthetic resin.
By adopting such a configuration, it is possible to obtain a bonded structure that is lightweight but has excellent tensile strength such as tensile strength and breaking load and has a small load on the structure. Moreover, it is possible to suppress the deterioration of the external appearance of the structure using the joint structure of the present invention.
Moreover, since the strands at the end of the first member can be separated, it is easy to place the second members having different sizes and shapes on top of each other or by inserting them.
The “overlapping portion” means a portion where the first member and the second member overlap each other when the second member is overlapped or inserted into an end portion of the first member.

Moreover, it is preferable that the edge part of the said 1st member has a space | gap part by which the said 2nd member is piled up or inserted and arrange | positioned.
By adopting such a structure, it is possible to suppress a portion (joint portion) covered with the synthetic resin of the overlapping portion of the obtained joint structure from being thickened, and to reduce the appearance of the resulting joint structure. Suppress. In addition, it is preferable because the adhesive strength between the first member and the second member can be stabilized and excellent tensile strength such as tensile strength and breaking load can be exhibited.

Moreover, it is preferable that a rod-like fiber reinforced composite material has a space | gap part which has a core wire and the strand arrange | positioned around it, and the said 2nd member is inserted and arrange | positioned.
By adopting such a configuration, the adhesive strength between the first member and the second member can be further stabilized, and the resulting bonded structure exhibits excellent tensile strength such as tensile strength and breaking load. can do. Moreover, the edge part of the said 2nd member is enclosed by the strand arrange | positioned around the core wire, and it is preferable also from a viewpoint of external appearance quality (designability).

  Moreover, it is preferable that the said rod-shaped fiber reinforced composite material contains a carbon fiber from a flame retardance, intensity | strength, and a light-resistant viewpoint.

  Moreover, since it is easy to adhere | attach a 1st member and a 2nd member more firmly when the said synthetic resin is a urethane resin or an epoxy resin, it is preferable that the said synthetic resin is a urethane resin or an epoxy resin.

  According to the joint structure of the present invention, it is lightweight but has excellent strength, and deterioration of the appearance of the structure using the joint structure can also be suppressed.

It is a side view of the junction structure concerning Embodiment 1 of the present invention. It is sectional drawing of the joining structure of FIG. 1A. It is a perspective view of the strand which concerns on Embodiment 1 of this invention. It is a side view of the junction structure concerning Embodiment 2 of the present invention. It is sectional drawing of the joining structure of FIG. 3A. It is a side view of the junction structure concerning Embodiment 3 of the present invention. It is sectional drawing of the joining structure of FIG. 4A. 2 is a photograph of a bonded structure according to Example 1.

  Hereinafter, embodiments of the bonded structure according to the present invention will be described. However, the present invention is not limited to the following embodiments, and can be arbitrarily modified without departing from the gist of the present invention. Further, when the expression “to” is used in the present specification, it is used as an expression including numerical values before and after the expression.

(Embodiment 1)
FIG. 1A is a side view showing a joint structure 100 according to Embodiment 1 of the present invention. FIG. 1B is a cross-sectional view of the bonded structure 100.
The bonded structure 100 according to the embodiment of the present invention includes a first member 120 made of a rod-like fiber reinforced composite material 110 composed of a wire 131 serving as a core wire and a wire 132 arranged around the wire 131, and the first member. The second member 140 is inserted and arranged at the end of 120, and the synthetic resin covering portion 150 is formed by covering and joining the overlapping portion of the first member 120 and the second member 140 with synthetic resin. Moreover, the length of the strand 131 is shorter than the length of the rod-like fiber reinforced composite material 110, and the end portion of the first member 120 has a void portion in which the second member 140 is inserted. That is, the overlapping portion between the first member 120 and the second member 140 is configured such that the end portion of the second member 140 is inserted into the gap portion at the end portion of the first member 120. Details of the first member 120, the second member 140, and the synthetic resin forming the synthetic resin coating 150 will be described later.

Moreover, the overlapping part of the 1st member 120 and the 2nd member 140 should just be formed in at least one of the edge parts of the 1st member 120, and the 2nd member 140 in the several edge part of the 1st member is sufficient as it. An overlapping portion may be formed.
In the present embodiment, the synthetic resin covering portion 150 covers the entire overlapping portion of the first member 120 and the second member 140, but may be configured to cover at least a part of the overlapping portion.

The length L2 of the synthetic resin coating 150 of the bonded structure 100 of the present embodiment may be set according to the required strength, but is preferably 10 mm to 1000 mm. Moreover, what is necessary is just to set the diameter (thickness) W2 of a synthetic resin coating | coated part according to the intensity | strength to require, but 3 mm-500 mm are good. In addition, from the viewpoint of the appearance of structures such as buildings and furniture after construction, the length L2 of the synthetic resin coating 150 is preferably shorter, and the length is more preferably 50 cm or less, 30 cm or less, and 20 cm or less. The thickness is more preferably 10 cm or less, 5 cm or less, and 3 cm or less.
The “diameter of the synthetic resin coating 150” refers to the maximum diameter of the cross section perpendicular to the length L2 direction of the synthetic resin coating 150 of the bonded structure 100 as shown in FIG. 1B. In the case where the cross section when cut perpendicular to the length L2 direction of the synthetic resin coating portion 150 of the bonded structure 100 is not a circle, the major axis of the cross section is referred to as the diameter.

  The length L1 in the length direction of the overlap portion and the diameter (thickness) W1 of the overlap portion may be set according to the required strength, but the length L1 in the length direction of the overlap portion is 10 mm to 500 mm. The diameter W1 of the overlapping portion is preferably 2 mm to 250 mm. The “diameter of the overlapping portion” is the maximum diameter of the cross section perpendicular to the length L1 direction of the overlapping portion, and when the cross section when cut perpendicular to the length L1 direction of the overlapping portion is not a circle, The major axis of the cross section is called the diameter.

  In the present embodiment, the length L1 of the overlapping portion is shorter than the length L2 of the synthetic resin coating portion 150, and the diameter W1 of the overlapping portion is smaller than the diameter W2 of the synthetic resin coating portion 150. The length relationship between the length of the synthetic resin coating portion 150 and the relationship between the diameter of the overlapping portion and the diameter of the synthetic resin coating portion 150 can be appropriately set according to the purpose of use within the scope of achieving the object of the present invention.

  For example, if the object of the present invention can be achieved, the bonded structure has a structure in which the length of the overlapping portion is longer than the length of the synthetic resin coating portion 150 and the diameter of the synthetic resin coating portion 150 is thicker than the diameter of the overlapping portion. Also good.

  Further, the bonded structure may have a structure in which the length of the overlapping portion is shorter than the length of the synthetic resin coating portion 150 and the diameter of the synthetic resin coating portion 150 is narrower than the diameter of the overlapping portion. That is, it may be a structure in which at least a part of the surface of the overlapping rod-shaped fiber reinforced composite material protrudes without being covered with the synthetic resin and is exposed to the outside. At this time, it is preferable that the second member of the overlapping portion is entirely covered with the synthetic resin.

  In addition, as for the joining structure body 100 of this embodiment, it is desirable for a breaking load to be 3-300 kN. The bonded structure depends on the place of use, construction method, and application, but the lower limit is preferably 5 kN or more, more preferably 10 kN or more, and further preferably 30 kN or more. When the breaking load is 3 kN or more, the bonded structure 100 having excellent strength can be obtained.

  On the other hand, the upper limit value is preferably 200 kN or less, and more preferably 100 kN or less. If it exceeds 300 kN, the length L2 of the synthetic resin coating portion 150 may become long, or the diameter W2 of the synthetic resin coating portion 150 may increase, and the appearance quality may deteriorate.

  Moreover, although the mass of the joining structure 100 of this embodiment is not specifically limited, When using as a reinforcing material of a traditional building, it is good in it being 5 kg or less. Preferably it is 3 kg or less, more preferably 1 kg or less. The mass of the joint structure 100 varies depending on the length, diameter and material of the first member 120 and the material and size of the second member 140, but it is lightweight and can be transported without using heavy machinery. From the viewpoint of workability, 5 kg or less is preferable. If it is the joining structure of this embodiment, the joining structure of said mass or less can be obtained easily. The lower limit is not particularly limited, but is preferably 5 g or more from the viewpoint of strength.

  Further, the first member 120 and the second member 140 constituting the bonded structure 100 and the synthetic resin forming the synthetic resin coating 150 are colored in accordance with the design of the structure in which the bonded structure 100 is used. Also good. The synthetic resin may be transparent or opaque. In this way, not only the deterioration of the appearance quality is suppressed, but by using the joint structure 100, the design of the appearance of the structure can be further improved according to various designs of the structure.

  Hereinafter, the first member 120, the second member 140, and the synthetic resin coating portion 150, which are components of the carbon fiber composite material of the present invention, will be described in detail.

(First member 120)

  The first member 120 is a rod-like fiber reinforced composite material 110 composed of a wire 131 serving as a core wire and a wire 132 arranged around the wire 131. In this embodiment, the strand 131 and the strand 132 are the strand 130A which integrated the fiber bundle which bundles the fiber material with the solidifying agent, or the fiber bundle which bundles the fiber material has a restraining material around it. It is one or both of the strands 130B which are wound and bundled, and the fiber bundle and the restraining material are integrated together by a solidifying agent.

  Hereinafter, the strand 130A and the strand 130B will be described in detail. The details of the rod-like fiber reinforced composite material 110 will be described later.

(Wire 130A)
The strand 130A which comprises the rod-shaped fiber reinforced composite material 110 integrates the fiber bundle formed by bundling fiber materials with a solidifying agent.
Examples of the fiber material used include carbon fiber, basalt fiber, para-aramid fiber, meta-aramid fiber, ultrahigh molecular weight polyethylene fiber, polyarylate fiber, PBO (polyparaphenylene benzoxazole) fiber, and polyphenylene sulfide (PPS). Fiber, polyimide fiber, fluorine fiber, polyvinyl alcohol (PVA fiber) and the like can be used. The fiber material used is particularly preferably carbon fiber or glass fiber from the viewpoint of flame retardancy, strength, and light resistance. Glass fiber is preferable from the viewpoint of flame retardancy.

  Hereinafter, the fiber material will be described in detail by taking as an example a carbon fiber, in particular, a material using carbon fiber as a core material of a strand. In addition, the thing using fiber materials other than carbon fiber is not excluded.

A carbon fiber bundle obtained by bundling a plurality of carbon fibers (usually several thousand to several hundred thousand or millions) is used. The carbon fiber bundle may have an arbitrary cross section such as a circular shape or a flat shape when cut perpendicular to the length direction of the carbon fiber bundle, but a circular shape is preferred. In the strand 130A used for the rod-like fiber reinforced composite material 110 of this embodiment, it is preferable that the bundle of carbon fibers is integrated by a solidifying agent in a state where a predetermined number of twists are applied. The number of twists of the carbon fiber bundle is the resistance to bending stress of the rod-like fiber reinforced composite material 110 obtained, the anti-breaking property of the carbon fiber bundle, the strength against twist of the carbon fiber bundle (the carbon fiber yarn cannot be cut by twisting), and will be described later. In the step of obtaining the element wire, the carbon fiber bundle does not jump out from between the restraining materials in a state before the solidifying agent is applied and the carbon fiber bundle and the restraining material described later are integrated. To be determined in consideration of
The twist number of the carbon fiber bundle is 0 to 100 times / m, preferably 2 to 50 times / m, more preferably 5 to 40 times / m, and further preferably 10 to 30 times / m.

  The strand 130A preferably has a diameter of 0.5 to 20 mm, and more preferably has a diameter of 1 to 5 mm. In addition, the diameter of the strand 130A used for the rod-shaped fiber reinforced composite material 110 of the present embodiment is a diameter of a cross section cut perpendicularly to the length direction of the strand 130A integrated with a solidifying agent, and has a target diameter. The diameter of the carbon fiber bundle and the application amount of the solidifying agent are selected so as to be. When the cross section of the strand 130A cut perpendicularly to the length direction is not a circle, the major axis of the cross section is called a diameter.

Further, the cross section of the strand 130A cut perpendicularly to the length direction may be arbitrary such as a circular shape or a flat shape, but a circular shape is preferable. The strength of the obtained strand 130A is stabilized, and a stable structure can be obtained even when the rod-like fiber reinforced composite material 110 (strand structure) or multistrand structure is used.
Further, when the diameter of the strand 130A is 0.5 to 20 mm (more preferably 1 to 5 mm), the strand 130A and the rod-like fiber reinforced composite material 110 described later can be easily wound around the drum. Flexibility, such as following the shape, can be improved.

Arbitrary carbon fibers, such as a polyacrylonitrile (PAN) type and a pitch type, can be used for the carbon fiber of this embodiment. Among these, a PAN-based carbon fiber yarn is preferable from the viewpoint of the balance between the strength and the elastic modulus of the rod-like fiber reinforced composite material 110 to be obtained.
In addition, carbon fiber bundles obtained by bundling the carbon fibers are 3000 (3K), 6000 (6K), 12000 (12K), 24000 (24K), 40000 carbon fibers supplied from a carbon fiber manufacturer ( 40K), 60000 (60K), or the like, and carbon fiber bundles bundled in one or more (two or more) depending on the required strength can be used. The number of carbon fiber bundles in the case of bundling a plurality of carbon fiber bundles obtained by bundling carbon fibers is not particularly limited and is appropriately determined depending on the intended use, but is usually 100 or less.

  As the solidifying agent of this embodiment, either a thermoplastic resin or a thermosetting resin can be used. Further, a solidifying agent having high affinity with carbon fiber is preferable. Since it can be given variability by heating in particular, the viewpoint of excellent adhesion when the synthetic resin of the synthetic resin coating 150 and the rod-like fiber reinforced composite material 110 are bonded using an adhesive. Is preferably a thermoplastic resin as a solidifying agent.

  Preferred examples include polyetheretherketone (PEEK), polypropylene, polyethylene, polystyrene, polyamide (nylon 6, nylon 66, nylon 12, nylon 42, etc.), ABS resin, acrylic resin, vinyl chloride resin, vinylidene chloride resin. , Polyphenylene oxide, polybutylene terephthalate, polyethylene terephthalate, polysulfone, polyethersulfone, polyetherimide, polyarylate, epoxy resin, urethane resin, polyimide resin, phenol resin, silicone resin, polycarbonate resin, resorcinol resin, etc. Not limited to this.

Among these, from the viewpoint of durability against acids and alkalis, polyether ether ketone (PEEK), acrylic resin, vinyl chloride resin, vinylidene chloride resin, polyethylene resin, epoxy resin, urethane resin, polycarbonate resin, resorcinol resin are preferable. In particular, it is excellent in impact resistance, and an epoxy resin is suitable. Moreover, if it is a thermoplastic epoxy resin, it can melt | dissolve in a ketone solvent and can separate a material and can recycle. Moreover, a polyimide resin and a silicone resin are preferable from a heat resistant viewpoint.
Further, from the viewpoint of excellent adhesion between the rod-like fiber reinforced composite material 110 and the synthetic resin of the synthetic resin coating 150, a thermoplastic epoxy resin is preferably used as a solidifying agent.

Further, among thermoplastic epoxy resins, a polymerization type thermoplastic epoxy resin that polymerizes after imparting to a carbon fiber bundle is preferable, and a polymerization type thermoplastic epoxy resin that polymerizes in a straight chain is particularly preferable.
In the strand 130B in which the carbon fiber bundle used for the core material of the rod-like fiber reinforced composite material 110 is twisted or the wire 130B around which the carbon fiber bundle described later is covered with a restraining material, It is difficult to impregnate the resin to the inside.
On the other hand, the polymerization-type thermoplastic epoxy resin can be easily adjusted in viscosity because the thermoplastic epoxy resin before polymerization can be diluted with an organic solvent.
Therefore, by using a low-viscosity resin solution diluted with an organic solvent, the inside of the carbon fiber bundle that has been twisted (even if the strand 130B is covered with the restraint, the outer restraint To the inner carbon fiber bundle) can be impregnated with a thermoplastic epoxy resin prior to polymerization. After impregnating the thermoplastic epoxy resin before polymerization into the inside of the carbon fiber bundle, the carbon fiber bundle and the restraining material were integrated with the thermoplastic epoxy resin by polymerizing the thermoplastic epoxy resin of the polymerization type, A strand with excellent strength can be obtained.

  In addition, a general thermoplastic resin used to impart fluidity by heating and melting is difficult to adjust the viscosity, and the crystal arrangement is changed by heating or melting because it is generally a crystalline resin, Although properties such as strength of the original resin may be altered, the polymerization type thermoplastic epoxy resin is amorphous before and after polymerization, so it can be melted and deformed by heating. The risk of alteration is small.

  The method of applying the above resin (solidifying agent) to the carbon fiber bundle may be a spray coating method or a method of coating the carbon fiber with a brush, but from the viewpoint of productivity, a dip-nip method or a resin ( After dipping into the solidifying agent solution, a method of removing excess resin through a die and adjusting the cross-sectional shape of the cross section perpendicular to the length direction of the carbon fiber bundle is preferable.

  The strand 130A may be provided with a separate resin layer so as to cover the entire outer periphery of the carbon fiber bundle integrated with the solidifying agent. From the viewpoint of improving incombustibility, it is preferable to provide a resin layer using a polyimide resin, a silicone resin, or a vinyl chloride resin. Further, from the viewpoint of design properties, a resin layer containing a colorant such as a pigment for coloring may be provided. These resin layers can be used with either a thermoplastic resin or a thermosetting resin. However, when a thermoplastic resin is used as a solidifying agent, the resin used for the separate layer is also a thermoplastic resin. preferable.

(Wire 130B)
Next, the strand 130B of other embodiment of this invention is demonstrated.
FIG. 2 is a perspective view showing the strand 130B. The strand 130B is obtained by binding a fiber bundle 2 formed by bundling fiber materials around a restraint material 3a, and the fiber bundle 2 and the restraint material 3a are both integrated by a solidifying agent. .
In addition, by making the fiber bundle 2 have a structure in which the binding material 3a is wound around the fiber bundle 2, the contact area between the strand 130B and the synthetic resin of the synthetic resin coating 150 and the structural resistance increase, The adhesive strength between the rod-like fiber reinforced composite material 110 and the synthetic resin of the synthetic resin covering portion 150 is improved, which is preferable from the viewpoint of the tensile strength and the breaking load of the obtained bonded structure 100.
Since the basic configuration other than the restraining material 3a is the same as that of the above-described strand 130A, description thereof will be omitted as appropriate.
In addition, the wire 130B will be described in detail by taking carbon fiber as the fiber material, in particular, using carbon fiber as the core material as an example, similarly to the above-described wire 130A. Hereinafter, a fiber bundle formed by bundling carbon fibers is also referred to as a carbon fiber bundle. In addition, the thing using fiber materials other than carbon fiber is not excluded.

  The restraining material 3a is capable of binding the carbon fiber bundle 2 from the peripheral surface so that the carbon fibers are not separated and stabilizing the shape of the strand 130B. In the present embodiment, the strand 130B constrains the carbon fiber bundle 2 with the restraining material 3a, and gives the solidifying agent thereto, so that the carbon fiber bundle 2 and the restraining material 3a are integrated by the solidifying agent. . Moreover, it is preferable that the carbon fiber bundle 2 is twisted like the strand 130A.

  In the strand 130B of this embodiment, the braided restraining material 3a is formed by winding the fiber used as the restraining material 3a around the outer periphery of the carbon fiber bundle 2 to form a tubular braid (round punching). (Those having the carbon fiber bundle 2 in the cylinder of the tubular braid so that the outer periphery of the carbon fiber bundle 2 is covered with the braid structure formed of the restraining material 3a). By making the restraining material 3a into a braid shape, the carbon fiber bundle 2 can be bound, and the shape of the obtained strand 130B can be further stabilized, and the restraining material 3a constitutes the carbon fiber bundle 2 inside. It functions as a protective layer that protects carbon fibers. In addition, since traditional Japanese braid technology is used, it is also excellent in design.

Therefore, when the joining structure 100 using the strand 130B having such a configuration is used as a tensile material or the like, it exhibits stable strength, good appearance quality, and breaks even when it comes into contact with sharp objects such as gravel. Can be prevented.
In addition, after dipping the carbon fiber bundle 2 restrained by the restraining material 3a into a resin (solidifying agent) solution, tension is applied in the length direction of the carbon fiber bundle 2 when handling excess resin with a die. If the outer periphery of the carbon fiber bundle 2 is covered with a braid structure made of the restraining material 3a, the eyes will not open like a knitted fabric, but the diameter of the braid will be reduced with the eyes closed. Therefore, the adhesion of the restraining material 3a and the carbon fiber bundle 2 can be enhanced while suppressing the exposure of the carbon fiber bundle 2 inside, which is preferable from the viewpoint of the strength of the obtained bonded structure 100.

In addition, the restraint material 3a should just be bound so that the carbon fiber which comprises the carbon fiber bundle 2 may not become disjoint, and arrangement | positioning of the restraint material 3a is not limited to braid shape. Further, it is not necessary to completely cover the surface of the carbon fiber bundle 2 with the restraining material 3a, and a part of the surface of the carbon fiber bundle 2 may not be covered.
As an example of binding with other restraining materials, a single restraining material is wound in a spiral shape to bind a carbon fiber bundle, or a fiber serving as a restraining material is wound around the carbon fiber bundle to form a coarse tube Alternatively, the carbon fiber bundle may be bundled by a knitted string-like restraining material obtained by knitting a circular knitting, or the carbon fiber bundle may be bundled by a restraining material in which fibers or the like are arranged at predetermined intervals.
On the other hand, from the viewpoint of protecting the carbon fiber bundle, stabilizing the strength due to the stability of the shape of the strand 130B, and suppressing the deterioration of the appearance quality, the restraint material is a tubular braid, and the inside of the tubular braid It is preferable that the carbon fiber bundle is disposed on the surface and the entire surface of the carbon fiber bundle is covered.

  The constraining material 3a is preferably a flexible material, such as polyamide (nylon or the like), vinylon, polyacryl, polypropylene, vinyl chloride, aramid, cellulose, polyamide, polyester, polyacetal or the like synthetic fiber, rayon or other regenerated fiber, acetate. Semi-synthetic fibers such as silk, wool, hemp, cotton and other natural fibers can be used. Moreover, the fiber excellent in heat stability is preferable, a glass fiber and a basalt fiber are preferable, and especially a glass fiber is preferable. By using a fiber with excellent thermal stability such as glass fiber, when heated, it has excellent non-flammability and suppresses the occurrence of deviation between the carbon fiber bundle and the restraint material, Nonflammability can be expressed.

  In addition, in the strand 130B, in order to bind the carbon fiber bundle 2 more firmly, in particular, the carbon fiber bundle 2 bound by the restraint material 3a is impregnated with a solidifying agent, and the carbon fiber bundle 2 is cured together with the restraint material 3a. It is preferable. By doing so, the carbon fiber bundle 2 and the restraint material 3a can be firmly integrated, and the stability of the shape of the obtained rod-like fiber reinforced composite material 110 and the joint structure 100 obtained by using this can be improved. Or strength, especially tensile strength is improved.

  The strand 130B has a diameter of 1 to 25 mm, more preferably 1 to 10 mm, and even more preferably 1 to 5 mm. The strand 130B and a rod-like fiber reinforced composite material 110 (strand structure) described later are used. And the multi-strand structure can be easily wound around the drum, and flexibility such as following an arbitrary shape can be improved. In addition, the diameter of the strand 130B used for the rod-like fiber reinforced composite material 110 of the present embodiment is cut perpendicularly to the length direction of the strand 130B integrated by the solidifying agent together with the carbon fiber bundle 2 and the restraining material 3a. The diameter of the carbon fiber bundle 2, the thickness of the coating with the restraining material 3 a, and the amount of the solidifying agent applied are selected so that the diameter is a cross-sectional diameter. When the cross section of the strand 130B cut perpendicularly to the length direction is not a circle, the major axis of the cross section is called a diameter.

  In addition, the strand 130B may be provided with a separate layer (such as a cylindrical body or a resin layer made of a fiber material) so as to cover the entire outer periphery of the carbon fiber bundle to which the restraining material and the solidifying agent are applied. From the viewpoint of improving incombustibility, a resin layer using a polyimide resin, a silicone resin, or a vinyl chloride resin may be provided. Further, from the viewpoint of designability, a resin layer containing a colorant such as a pigment for coloring may be separately provided. These resin layers can be used with either a thermoplastic resin or a thermosetting resin. However, when a thermoplastic resin is used as a solidifying agent, the resin used for the separate layer is also a thermoplastic resin. preferable.

(Bar-like fiber reinforced composite 110)
The rod-like fiber reinforced composite material 110 of the present invention will be described.
The rod-like fiber reinforced composite material 110 is a strand structure having a structure in which one strand 131 serving as a core wire disposed in the center is surrounded by the other six strands 132. With such a structure, in the synthetic resin coating 150, the contact area and structural resistance between the rod-like fiber reinforced composite material 110 and the synthetic resin are increased, and the adhesion between the synthetic resin and the rod-like fiber reinforced composite material 110 is increased. The strength is improved, which is preferable from the viewpoints of improvement in tensile strength and stability of the bonded structure 100 to be obtained.
The “strand structure” means a structure in which two to several tens of strands having the same diameter or different diameters are arranged in a single layer or multiple layers, or two to several tens of diameters having the same diameter or different diameters. It means a structure in which the strands of a book are twisted into a single layer or multiple layers.

  The rod-like fiber reinforced composite material 110 uses either one or both of the above-described strands 130A and 130B as a constituent body, and instead of the strand structure formed by twisting a plurality of them, the above-described strand structure is used. One or both of the strands 130A and 130B may be used as a constituent body, and a plurality of these strand structures may be formed to be aligned.

  Moreover, although the strand 130A and the strand 130B were illustrated as a strand which comprises a rod-shaped fiber reinforced composite material, it is not limited to this, Any may be sufficient as long as it is the structure of the strand of this invention. Further, different strands may be used in combination as long as they satisfy the requirements of the strand of the present invention.

  Further, in the rod-like fiber reinforced composite material 110 according to the present embodiment, the strand structure in which the strand 131 serving as the core (core wire) and the other six strands 132 surrounding the strand 131 serving as the core are twisted together. Therefore, even if the seven strands are not integrated using a resin, they can be prevented and integrated. The rod-like fiber reinforced composite material 110 can maintain an excellent tensile strength even when the drum-like fiber reinforced composite material 110 is further stretched after being subjected to a winding bending stress or used in a location where the bending stress is applied.

Also, as the direction to form the twist,
Carbon fiber bundle × strand structure = S direction × Z direction, S direction × S direction, Z direction × Z direction, Z direction × S direction are all possible.

  The number of twists of the strand structure is selected from 1.1 to 50 times / m depending on the purpose. If the number of twists is too small, it will be easy to break apart in units of core material. On the other hand, if the number of twists is too large, the tensile strength may decrease. When the number of strands is 7 to 37, 1.5 to 20 times / m is preferable. More preferably, it is 2 to 10 times / m.

Further, the number of strands constituting the strand structure is seven, but is not limited to this, and is appropriately determined in consideration of the intended performance (particularly breaking load) and application, and is not particularly limited. Usually, there are 2-50. The number is preferably 7 to 37.
For example, in the case of the rod-like fiber reinforced composite material 110 using one bundle of 24,000 carbon fibers (24k) as a carbon fiber bundle, the number of strands constituting the strand structure is about 2 to 50 It is suitable for uses such as brace material.

  The rod-like fiber reinforced composite material 110 of the present embodiment is integrally twisted with other strands configured to surround one strand used as a core wire, but the structure of the strand structure As a matter of course, a core wire that is a core may not be provided, a necessary number (for example, 2 to 50) of strands may be bundled, and the entire bundled strands may be twisted.

Further, the rod-like fiber reinforced composite material 110 of the present embodiment uses one strand 131 as a core wire, but if a thicker core wire is required, a plurality of strands may be bundled. In particular, it is particularly preferable that the cross section be circular.
In addition, what is necessary is just to determine suitably the number of the strands which comprise a core wire according to the use purpose.

Further, in the rod-like fiber reinforced composite material 110, the length of the strand 131 serving as a core wire is shorter than the length of the rod-like fiber reinforced composite material 110, and the second member 140 is inserted into the end of the rod-like fiber reinforced composite material 110. It has a void portion to be arranged. In other words, the void portion is a hollow portion that opens toward the end face of the rod-like fiber reinforced composite material 110.
Since the end of the rod-like fiber reinforced composite material 110 has a gap, it is easy to insert the end of the second member into the end of the first member, and the shaft of the first member 120 and the second member 140 Becomes a linear shape, and the resulting bonded structure can exhibit more excellent tensile strength such as tensile strength and breaking load.

  It is also possible to form a strand structure using strands having different lengths so that a gap is formed at the end of the rod-like fiber reinforced composite material 110, or to cut and form the strand after forming the strand structure. it can.

In addition, as long as the 2nd member is inserted and arrange | positioned at the edge part of the 1st member, the length of the strand used as a core wire may be equivalent to the length of the rod-shaped fiber reinforced composite material 110.
Both ends of the rod-like fiber reinforced composite material may have the same shape, but need not have the same shape, and may have a structure having a void at one end and no void at one end.

  When the diameter of the rod-like fiber reinforced composite material 110 is 2 to 100 mm, more preferably 4 to 50 mm, and even more preferably 6 to 20 mm, the rod-like fiber reinforced composite material 110 can be easily wound around a drum. Flexibility, such as following the shape, can be improved.

  The rod-like fiber reinforced composite material 110 may be a multi-strand structure obtained by further combining the strand structures.

Further, the rod-like fiber reinforced composite material 110 may be provided with a coating layer (a cylindrical body or a resin layer made of a fiber material) so as to cover the outer periphery of the strand structure or the multi-strand structure.
However, the rod-like fiber reinforced composite material 110 can be arranged with the second member 140 inserted into at least one end, and at least a part of the overlapping portion between the rod-like fiber reinforced composite material 110 and the second member is made of synthetic resin. It is necessary to cover and join. The overlapping portion needs to be in a state without a covering layer so that the ends of the rod-like fiber reinforced composite material 110 can be separated or the synthetic resin can penetrate and adhere inside the overlapping portion. In addition, when tearing and using the coating layer of the edge part of a rod-shaped fiber reinforced composite material, the coating layer may remain in the overlapping part.

In the strand structure and the multi-strand structure, dust or the like easily adheres between the twisted strands. However, by separately providing a coating layer, the adhesion of these dusts can be suppressed.
Further, from the viewpoint of improving nonflammability, the coating layer may be provided with a resin layer using a polyimide resin, a silicone resin, or a vinyl chloride resin so as to cover the entire surface.
From the viewpoint of design, a resin layer containing a colorant such as a pigment for coloring may be separately provided as a coating layer so as to cover the entire surface.
These resin layers can be used with either a thermoplastic resin or a thermosetting resin. However, when a thermoplastic resin is used as a solidifying agent, the resin used for the coating layer is also a thermoplastic resin. preferable.

The rod-like fiber reinforced composite material 110 desirably has a density of 1.0 to 2.5 g / cm ³ . The lower limit is preferably 1.2 g / cm ³ or more, more preferably 1.4 g / cm ³ or more. If it is 1.0 g / cm ³ or more, the bonded structure 100 having excellent strength can be obtained. On the other hand, the upper limit is preferably 2.2 g / cm ³ or less, more preferably 2.0 g / cm ³ , and even more preferably 1.8 g / cm ³ or less. If it is 2.5 g / cm ³ or less, a light bonded structure 100 is obtained.

  The mass of the rod-like fiber reinforced composite material 110 is desirably 2 to 150 g / m. The lower limit is preferably 5 g / m or more, more preferably 10 g / m, and still more preferably 40 g / m or more. If it is 2 g / m or more, the bonded structure 100 having excellent strength can be obtained. On the other hand, the upper limit is preferably 120 g / m or less, more preferably 100 g / m or less. If it is 150 g / m or less, the light joining structure 100 is obtained.

  The rod-like fiber reinforced composite material 110 preferably has a tensile strength of 100 to 5000 MPa. About a lower limit, Preferably it is 500 Mpa or more, More preferably, it is good in it being 1000 Mpa or more. If it is 100 MPa or more, the bonded structure 100 having excellent strength can be obtained. On the other hand, the upper limit value is preferably 4000 MPa or less, and more preferably 3000 MPa or less. If the pressure exceeds 5000 MPa, the bonded structure becomes heavy or loses flexibility, and there is a possibility that it cannot be wound up and stored.

(Second member 140)
The second member 140 uses M8 steel bolts.
The second member 140 may have any structure as long as it can be inserted into the end of the first member 120. For example, a steel bolt with a screw cut (M8, M10, M12 steel bolt). Etc.) or the like having at least one end in a rod shape can be used. The end of the second member 140 that is inserted into the first member is preferably rod-shaped, but may be spiral, plate-shaped, U-shaped, or ring-shaped. Good.
The second member may be the same material as the first member. If the end of the second member 140 overlapped with the end of the first member 120 has irregularities such as by cutting the surface of a screw, the synthetic resin covering portion 150 has an adhesive force between the synthetic resin and the second member 140. The bonded structure 100 obtained by improvement is preferable from the viewpoint that excellent tensile strength can be obtained.

  The shape of the second member 140 is not particularly limited, and the end portion of the first member 120 that is not inserted into the end portion may be a rod shape or may be a rod shape and screwed. In addition, it may be plate-shaped, U-shaped or ring-shaped, on the side that is not inserted into the end of the first member 120 on the pillar, beam, floor, wall, or ground to be reinforced. It is only necessary that the end can be fixed with a nut, a bolt, a nail, a string, a cloth-like object, a pile, or the like. In addition, the bonded structure 100 is bonded to the other end of the second member 140 that is not inserted into the end of the first member 120 with a nut, a bolt, a nail, a string, a cloth-like object, a pile, or the like. You may fix to a pillar, a beam, a floor, a wall, the ground, etc. via a jig | tool.

(Synthetic resin coating 150)
The synthetic resin of the synthetic resin coating 150 is a urethane resin. The synthetic resin is not limited to the urethane resin, and the synthetic resin can be appropriately selected as long as the object of the present invention can be achieved. As a synthetic resin of the synthetic resin coating portion 150, instead of urethane resin, epoxy resin, melamine resin, silicone resin, phenol resin, natural rubber, synthetic rubber and other rubber-based materials, α-olefin resin, acrylic resin, vinyl acetate resin, Synthetic resins such as unsaturated polyester resins and vinyl ester resins may be used. From the viewpoint of adhesiveness, a urethane resin or an epoxy resin is preferably used.
Specifically, a urethane resin containing a polyol and a polyisocyanate, which is an alkylene oxide adduct of a polyhydric alcohol, is preferable. The weight average molecular weight of the polyol is preferably 600 or less. As the polyhydric alcohol, glycerin, trimethylolpropane, or pentaerythritol is preferable. Further, from the viewpoint of heat resistance, the glass transition temperature (Tg) is preferably 70 ° C. or higher, more preferably 80 ° C. or higher, and further preferably 90 ° C. or higher. Although there is no upper limit in particular, it is about 130 degreeC.

<Embodiment 2>
FIG. 3A is a side view of the bonding structure 101 according to Embodiment 2 of the present invention. FIG. 3B is a cross-sectional view of the bonded structure 101. 3A and 3B, the same components as those in FIG.
As shown in FIG. 3A, the bonded structure 101 includes a rod-shaped fiber reinforced composite material 111 that is a first member, a second member 140 that is stacked on the end of the rod-shaped fiber reinforced composite material 111, and an overlapping portion. It consists of a synthetic resin coating 150 that covers and joins at least a portion with a synthetic resin.

  In the present embodiment, the length L3 of the overlapping portion is longer than the length L4 of the synthetic resin coating portion 150, and the diameter W3 of the overlapping portion is smaller than the diameter W4 of the synthetic resin coating portion 150. The relationship between the length L3 and the length L4 of the synthetic resin coating 150 and the relationship between the diameter W3 of the overlapping portion and the diameter W3 of the synthetic resin coating 150 can be set as appropriate according to the purpose of use as in the first embodiment.

The rod-shaped fiber reinforced composite material 111 is a strand structure having a structure in which the other strands 134 surround the core wire 133, and the length of the strand 133 is equal to the length of the rod-shaped fiber reinforced composite material 111. The structure is the same as that of the rod-like fiber reinforced composite material 110 except that the structure is substantially the same and does not have a gap at the end. The strand 133 used as a core wire is the same as the strand 131 except that length differs. The strand 134 is the same as the strand 132.
As in the first embodiment, the type and number of the strands of the rod-like fiber reinforced composite material 111 can be changed as appropriate without departing from the object of the present invention. Further, the rod-like fiber reinforced composite material 111 may have a configuration in which a plurality of strands are aligned, or a configuration without a core wire. Further, the rod-like fiber reinforced composite material 111 may be a multi-strand structure.

  Similarly to the first embodiment, the second member 140 may have a structure that can be placed on the end portion of the rod-like fiber reinforced composite material 111. For example, a steel bolt (M8, M10, For example, an M12 steel bolt or the like having at least one end in a rod shape can be used. Note that the end portion of the second member 140 that is disposed so as to overlap the rod-like fiber reinforced composite material 111 is preferably rod-like, but may be spiral or plate-like, U-shaped, or ring-shaped. It may be. The second member 140 may be the same as the rod-like fiber reinforced composite material 111.

  The synthetic resin of the synthetic resin coating portion 150 is a urethane resin, but is not limited to the urethane resin as in the first embodiment, and the synthetic resin can be appropriately selected as long as the object of the present invention can be achieved. As a synthetic resin of the synthetic resin coating portion 150, instead of urethane resin, epoxy resin, melamine resin, silicone resin, phenol resin, natural rubber, synthetic rubber, etc., α-olefin resin, acrylic resin, vinyl acetate resin, Synthetic resins such as unsaturated polyester resins and vinyl ester resins may be used.

<Embodiment 3>
FIG. 4A is a side view of the joint structure 102 according to Embodiment 3 of the present invention. FIG. 4B is a cross-sectional view of the bonded structure 102. In FIG. 4A and FIG. 4B, the same components as those in FIG.

  The joint structure 102 is joined by covering the overlapping portion with a synthetic resin and the second member 140 disposed to overlap the end portion of the rod-like fiber reinforced composite material 112, which is a first member. It consists of a synthetic resin coating 150. Moreover, the edge part of the rod-shaped fiber reinforced composite material 112 has the space | gap part by which the 2nd member 140 is piled up and arranged.

  In the present embodiment, the length L5 of the overlapping portion is shorter than the length L6 of the synthetic resin coating portion 150, and the diameter W5 of the overlapping portion is smaller than the diameter W6 of the synthetic resin coating portion 150. The length L5 and the length L6 of the synthetic resin coating portion 150 and the relationship between the overlapping portion diameter W5 and the synthetic resin coating portion 150 diameter W6 can be appropriately set according to the purpose of use as in the first embodiment.

The rod-like fiber reinforced composite material 112 as the first member is a strand structure having a structure in which a total of six strands of four strands 136 and two strands 137 surround a strand 135 serving as a core wire. . As shown in FIG. 4A, the rod-shaped fiber reinforced composite material 112 is composed of two strands 137 of the six strands arranged around the strand 135 serving as the core. It is shorter than the length of the line 136 and has a gap at the end.
The rod-like fiber reinforced composite material 112 is the same as the rod-like fiber reinforced composite material 110 except that the lengths of the wire 135 and the wire 137 are different. The strand 135 used as a core wire is the same as the strand 131 except that length differs. The strand 136 is the same as the strand 132. The strand 137 is the same as the strand 132 except that the length is different.
As in the first embodiment, the type and number of the strands of the rod-like fiber reinforced composite material 112 can be changed as appropriate without departing from the object of the present invention. Further, the rod-like fiber reinforced composite material 112 may have a configuration in which a plurality of strands are aligned, or a configuration without a core wire. Further, the rod-like fiber reinforced composite material 112 may be a multi-strand structure.

  Similarly to the first embodiment, the second member 140 may have a structure that can be placed on the end of the rod-like fiber reinforced composite material 112. For example, a steel bolt (M8, M10, For example, an M12 steel bolt or the like having at least one end in a rod shape can be used. Note that the end of the second member 140 that is placed on the rod-shaped fiber reinforced composite material 112 is preferably rod-shaped, but may be spiral or plate-shaped, U-shaped, or ring-shaped. It may be. The second member 140 may be the same as the rod-like fiber reinforced composite material 111.

  The synthetic resin of the synthetic resin coating portion 150 is an epoxy resin, but is not limited to the resin as in the first embodiment, and the synthetic resin can be appropriately selected within a range in which the object of the present invention can be achieved. As a synthetic resin of the synthetic resin coating portion 150, instead of an epoxy resin, a urethane resin, a melamine resin, a silicone resin, a phenol resin, a natural rubber, a synthetic rubber or other rubber type, an α-olefin resin, an acrylic resin, a vinyl acetate resin, Synthetic resins such as unsaturated polyester resins and vinyl ester resins may be used.

[Application of bonded structure]
The joint structure 100, 101, 102 of the present embodiment having the above configuration is lightweight and has excellent strength, and can prevent heavy machinery such as crane trucks from entering by suppressing deterioration in design and appearance quality. It is possible to perform seismic reinforcement of traditional buildings built in the place and traditional buildings that could not withstand the mass of conventional seismic reinforcements and could not withstand earthquakes. Furthermore, it can be used as a reinforcing material or a structural material for various structures such as steel, steel bars, wooden structures, etc., furniture such as tables, chairs, handrails, plant attracting strings, wire replacements, and fences. it can.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above can also be employ | adopted within the scope of the technical idea of this invention.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to a following example, unless the summary is changed.
Various data in this example were measured by the following method.

<Diameter>
The diameter of the wire, the rod-like fiber reinforced composite material, the overlapping portion, and the length and thickness of the synthetic resin coating portion were measured with calipers.
<Mass>
The rod-like fiber reinforced composite material and the strand were cut into 10 cm, the mass was measured using an electronic balance, the value was multiplied by 10, and the mass per 1 m was determined.
<Density>
Measurement was performed according to JIS K7112: 1999 A method (underwater substitution method).
<Tensile strength and breaking load>
Tensile strength and breaking load were measured under the condition of 2 mm / min using a 5980 floor type high capacity universal testing machine model 5985 supplied from Instron Japan Ltd. (measurement environment is room temperature (about 25 ° C.) ). The load (kN) when the sample broke was taken as the rupture load. Tensile strength (MPa) is obtained by dividing the load (kN) when the sample broke into the breaking load, and dividing the breaking load by the cross-sectional area (effective cross-sectional area) cut perpendicular to the length direction of the rod-like fiber reinforced composite material. It was.

Example 1
Three bundles of 24K carbon fiber bundles (PAN-based carbon fiber, manufactured by Toray Industries, Inc., T700SC), one of which is twisted 10 times / m in the S direction, are used as carbon fiber bundles, and glass fiber as a restraining material. , And the entire outer circumference of the carbon fiber bundle was constrained by braided glass fibers with 16 striking stones using a stringing machine (24 hammering machine).

next,
Polymerization type thermoplastic epoxy resin (DENATITE XNR6850V, solid content 85% by mass, manufactured by Nagase ChemteX Corporation), 100 parts by mass,
Curing agent (DENATEITE XNH6850V, solid content 30% by mass, manufactured by Nagase ChemteX Corporation) 6.5 parts by mass,
Dipping into a solution (viscosity 150 mPa · s) consisting of 10 parts by weight of methyl ethyl ketone (MEK), passing through a die to remove excess solution, and the cross-sectional shape when cut perpendicular to the length direction of the carbon fiber bundle is The shape was adjusted to be circular, and a solidifying agent was applied to the restrained carbon fiber bundle. Thereafter, the polymerized thermoplastic epoxy resin is polymerized by heat treatment (150 ° C., 20 minutes), and the carbon fiber bundle, the binding material, and the thermoplastic epoxy resin (solidifying agent) are integrated to form a strand. Got.

The obtained strand of Example 1 had a circular cross section, a diameter of 3 mm, and a mass of 12.8 g / m. The breaking load was 13 kN, and the tensile strength was 1800 MPa (effective sectional area 7.1 mm ² ).
Met.
When the strand was wound on a drum having a diameter of 100 cm at a room temperature of 3000 m, it could be wound smoothly without breaking.

Next, 7 strands obtained were used, one strand as a core wire at the center, and twisted while heating at 120 ° C. so as to cover the periphery with 6 strands, to form a strand structure, A rod-like fiber reinforced composite material was obtained.
The obtained rod-like fiber reinforced composite material of Example 1 had a diameter of 9 mm, a density of 1.6 g / m ³ , and a mass of 80 g / m. The breaking load was 90 kN, and the tensile strength was 1800 MPa (effective sectional area 50 mm ² ).
Next, 9 cm of the core material of the rod-like fiber reinforced composite material was cut off from the end. This was used as the first member.

  Next, as a second member, a steel bolt (hereinafter referred to as an M8 bolt; thickness (thick portion: 7.7 mm)) having a 15 cm long screw cut is used, and the M8 bolt is used as a core of a rod-like fiber reinforced composite material. It was inserted into the part where the material was cut out to form an overlapping part. The length of the overlapping portion was 9 cm. The thickness of the overlapping portion was 1.55 cm at the thick portion.

  Next, in order to join the overlapping portion with a synthetic resin, the tube is inserted into a synthetic resin tube having a length of 10 cm and an inner diameter of 21 mm (with a peeling film attached to the inner wall of the tube) so that the entire overlapping portion enters, The tube is filled with a mixture of polyether polyol and polyisocyanate, which is an alkylene oxide adduct of polyhydric alcohol, and left at room temperature (25 ° C.) for 1 hour to react and cure the polyol and polyisocyanate to obtain a urethane resin ( Tg93 ° C.). After the urethane resin is cured, the tube is removed and cured for one week in the room, and the first member, the second member, and the entire overlapping portion where the first member and the second member overlap are covered with the urethane resin and bonded. A bonded structure composed of a synthetic resin coating was obtained. FIG. 5 shows a photograph of the bonded structure.

  When the breaking load of the obtained bonded structure was measured, it was 20 kN. The state of the break was not the destruction of the synthetic resin coating part, but the M8 bolt was broken, and the overlapping part had sufficient strength by the urethane resin. The thickness of the synthetic resin coating part joined by the urethane resin, that is, the synthetic resin was as thin as 2 cm and the length was as small as 10 cm, and was short and excellent in design. Furthermore, the synthetic resin coating portion was transparent, and the rod-like fiber reinforced composite material covered with the urethane resin, the strands, and the M8 bolts could be seen through. From this viewpoint, the design was excellent.

  The bonded structure of the present invention is lightweight and has excellent strength, and suppresses deterioration in design and appearance quality, so that traditional buildings built in places where heavy machinery such as crane cars cannot enter and conventional structures Seismic reinforcement of traditional buildings that could not withstand the mass of seismic reinforcement and could not be seismically reinforced is possible. Furthermore, it is used as a reinforcing material or structural material for various structures such as general buildings such as steel, rebar, wooden, concrete, furniture such as tables, chairs, and handrails, attracting strings for plants, wire substitutes, and fences. be able to.

2 Carbon fiber bundle 3a Restraint material 100, 101, 102 Bonded structure 110, 111, 112 Rod-like fiber reinforced composite material 120 First member 130A, 130B Wire 131, 133, 135 Core wire 132, 134, 136, 137 Around the core wire Wires arranged in 140 140 Second member 150 Synthetic resin coating

Claims (5)

A first member made of a rod-like fiber reinforced composite material composed of a plurality of strands;
A second member that is placed over or inserted into an end of the first member;
A joining structure comprising: a synthetic resin covering portion that covers and joins at least a part of an overlapping portion between the first member and the second member with a synthetic resin.   2. The joint structure according to claim 1, wherein an end portion of the first member has a gap portion in which the second member is arranged to be overlapped or inserted. The rod-like fiber reinforced composite material has a core wire and a strand arranged around the core wire,
3. The joint structure according to claim 1, wherein an end portion of the first member has a gap portion in which the second member is inserted.   The joined structure according to any one of claims 1 to 3, wherein the rod-like fiber reinforced composite material includes carbon fibers.   The joined structure according to any one of claims 1 to 4, wherein the synthetic resin is a urethane resin or an epoxy resin.