JPH05154919A - Connecting method of frp wiry body - Google Patents

Abstract

PURPOSE:To contrive to improve connection effect and durability, to relieve the discontinuity in rigidity and the like by a method wherein fibrous bodies are exposed by removing cured resin at the end of each of FRP wiry bodies and, after being impregnated with uncured resin, braided in together so as to be connected with each other. CONSTITUTION:When a plurality of FRP wiry bodies 10 are to be connected with each other, firstly the cured resin 14 at the end of each of the FRP wiry bodies 10 is removed through chemical decomposition so as to expose fibrous bodies 16. Next, the exposed fibrous bodies 15 are impregnated with uncured resin 18, which is the same kind as the resin 14, and then braided in together so as to be connected with each other. Or, after the fibrous bodies 16 are braided in together so as to be connected with each other, uncured resin 18, which is the same kind as the resin 14, is infiltrated in the fibrous bodies. In succession, the uncured resin 18 is cured by heating. Thus, the tensile strength represented by the fibrous body 16 is utilized and the connection effect is improved. Further, the characteristics of the fibrous bodies 16 are held as those of other FRP wiry bodies so as to relieve the discontinuity in rigidity and, at the same time, to improve the durability of the FRP wiry bodies.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The tether cable used for marine development uses FRP filaments as a tensile strength material. The present invention relates to a method for connecting FRP filaments that are already in use, that is, the impregnated resin (matrix) has been cured, like the FRP filaments described above.

[0002]

2. Description of the Related Art As shown in FIG. 2, FRP filaments 10 are adhered to each other with an adhesive 20 (eg, epoxy resin). In addition, (A) is a case of simply abutting, (B) is a case where the abutting surface is inclined to increase the adhesion area, (C)
Indicates the case where the discrepancy is caused to further increase the adhesion area. In addition to this, many variations for increasing the adhesion area have been considered.

[0003]

[Problems to be Solved by the Invention]

1) The conventional method described above expects only the adhesive force between the FRP and the adhesive. Therefore, although the tensile strength is slightly different depending on the type of adhesive and the adhesive area, the connection efficiency is satisfactory. Not something you can do. The connection efficiency is a coefficient used to indicate the degree of decrease in tensile rupture value due to connection, and is calculated from the equation ((breaking tension of the connecting portion) / the original breaking tension of the FRP) × 100%. 2) Especially in the case of a tether cable or the like, since the FRP filament is spiral, the adhesion area is limited, and the above method cannot provide satisfactory results. 3) As the adhesive, an epoxy resin-based adhesive having a strong adhesive force is usually used. Therefore, the rigidity becomes unbalanced and discontinuous in the vicinity of the connection portion, and it tends to be a weak point against bending and twisting.

[0004]

[Means for Solving the Problems] As shown in FIG. 1, 1) the cured resin at the end of the FRP filament 10 is chemically decomposed and removed to take out the fibrous body 16, ) The taken out fibrous bodies are impregnated with an uncured resin of the same kind as the resin and then braided together to be joined, or after the fibrous bodies are braided together and joined to each other, an uncured resin of the same kind as the resin It is impregnated with resin, and 3) after that, the uncured resin is cured by heating.

[0005]

[Work]

1) By chemically decomposing and removing the cured resin at the end of the FRP filament, and removing the fibrous body,
The fibrous bodies can be woven together and joined together. 2) By braiding and connecting the fibrous bodies to each other, the tensile strength of the fibrous bodies is utilized. 3) After weaving the fiber bodies together and connecting them,
By curing the resin impregnated in the fibrous body and re-FRPing, the state becomes almost the same as that of the FRP filament body other than the connection portion, and partial imbalance in rigidity does not occur.

[0006]

[Detailed description of means for solving the problem] For example, in the FRP filament used for the tether cable, aramid fiber (trade name Kevlar) or the like is used as the fiber (reinforcing material), and unsaturated polyester resin or the like is used as the resin (matrix). Be done. F
In order to decompose the hardened resin of the RP filament 10, alkali treatment with caustic soda = sodium hydroxide (NaOH) is effective. First, the protective layer 12 at the end of the FRP filament 10 is removed to expose the FRP shown in FIG. 1 (A), and the above alkali treatment is performed. The surface of the resin 14 is melted by the alkali treatment, and the inside is worn out (conagon).
As it becomes the state of, remove the broken resin while washing with water. When the resin is removed, the fibrous body 16 is taken out as shown in FIG.

Next, the taken out fibrous body 16 is impregnated with an uncured resin 18 of the same kind as the resin removed previously, and the fibrous bodies 16 thus formed are knitted and joined together.
(C).

[0008] The term "knitting" in knitting is used in the sense of "mismatching (intersecting) (interlacing with each other)" (Kojien). The meaning is "to entangle elongated objects such as cousins in a misplaced manner."
It is the same as "twisting" when used in the sense of "Kojien" and "twisting" when used in the sense of "assembled and wrapped" (Kojien).

By doing so, the formed state (tether-like, string-like, etc.) is maintained by the frictional force acting between the fibrous bodies, and it is possible to resist external force such as pulling. Alternatively, the fibrous bodies may be woven together and connected to each other, and then the uncured resin may be impregnated. After doing the above, heat the connection part,
The uncured resin is cured.

[0010]

【The invention's effect】

1) Since the fibrous bodies are woven together and connected together,
By utilizing the tensile strength of the fibrous body, the connection efficiency is improved as compared with the conventional adhesive method. 2) Since the fibrous body, which is woven together and connected to each other, is re-FRP-formed using the same kind of resin as FRP, the connection part has almost the same characteristics as the other parts of the FRP filament body, and the rigidity is unbalanced. Etc. discontinuity is alleviated, bending resistance and twisting resistance are improved, and peeling of the adhesive surface does not occur. 3) Therefore, it is particularly suitable for repairing when, for example, several FRP filaments used as a strength member for a tether cable are damaged (during use).

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method of an embodiment of the present invention in process order.

FIG. 2 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 10 FRP linear body 12 protective layer 14 resin 16 fibrous body 18 uncured resin 20 adhesive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Shinozaki 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Tetsuya Kamijo 1-5-1, Kiba, Koto-ku, Tokyo Fujikura (72) Inventor Hiroyuki Kuriyama 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (1)

[Claims] 1. When connecting two FRP filaments, at each end of the FRP filaments, the cured resin is chemically decomposed and removed to take out and remove the fibrous body. The fibrous bodies are impregnated with an uncured resin of the same kind as the resin and then braided together to be connected, or the fibrous bodies are braided and connected to each other and then impregnated with an uncured resin of the same kind as the resin. FRP, which is then cured by heating the uncured resin
How to connect the striatum.