JPH094066A - Frp pipe connector and manufacture thereof - Google Patents

Abstract

PURPOSE: To enhance the strength of a joining area by fitting an insert jig into an FRP pipe, and providing a groove area in a fit-in surface of this insert jig, and filling a filler into the groove. CONSTITUTION: A metal-made insert jig 2 is fitted into an FRP pipe 1 on both sides of the FRP pipe 1 where a groove area 3, which is designed to fill up a filler 6 into the jig 2, is formed on the whole periphery of the insert jig 2. An O ring 4, which closes the fit-in surface between the FRP pipe 1 and the jig 2 is installed before and behind the grove area 3 of the insert jig 3, thereby laminating a reinforcing layer 5 on the outer peripheral surface of the FRP pipe 1 in the fit-in part between the FRP pipe 1 and the insert jig 2. It is, therefore, possible to broaden the application range of the FRP pipe connector since the strength of the connecting area is high and heat resistance is also enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body of an FRP pipe and another member and a method for manufacturing the joined body.

[0002]

2. Description of the Related Art Since FRP is superior in specific strength and specific rigidity as compared with metal materials such as steel and aluminum, it has been increasingly applied to members that need to be lightweight. Taking an FRP pipe as an example, a tension rod that supports a tensile load, a torque tube that transmits torque, a structure (boom) having a rigid frame structure, and the like can be given.

Here, the FRP pipe requires a joint portion for joining with another member. Generally, a metal material is often used as the mating material.

In joining dissimilar materials such as FRP and a metal material, a method in which they are punched and fastened with bolts and nuts, a method in which they are bonded with an adhesive, a method in which they are threaded and fastened, and both are press-fitted and joined. Methods etc. have been proposed.

However, in the method of fastening with bolts and nuts, the breaking strength of the joint is about 5 times that of the FRP pipe.
Only 0% is expressed, and the performance of FRP pipe cannot be fully utilized. In addition, regarding adhesion, even with an epoxy adhesive that is said to exhibit high strength in the adhesion between FRP and metal,
There is a drawback that the strength is extremely lowered in an atmosphere of 150 ° C. or higher, and it is difficult to apply it to a member that requires heat resistance. In addition, when the positive and negative loads are repeatedly applied, the surface hardness is FRP due to the fastening method of cutting both themselves.
And the metal are different, the thread on the FRP side is worn away, and the fastening may become loose. In the method of press-fitting both of them, in order to obtain high joint strength, if the press-fitting is performed with a large press-fitting margin, the inner surface of the FRP pipe may be separated.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the conventional FRP pipe joined body, and the joint portion has high strength and high strength even in a high temperature atmosphere.
FRP that can be applied to a wide range of FRP pipe joints
Provided are a pipe joined body and a manufacturing method thereof.

[0007]

In order to achieve the above object, the FRP pipe joined body of the present invention comprises an FRP pipe and an insert jig fitted in the FRP pipe. A groove portion is provided on the fitting surface side of and, and the groove portion is filled with a filler formed by fitting the FRP pipe and the insert jig in a pressed state.

As the reinforcing fiber in the FRP pipe, it is desirable to use glass fiber, aramid fiber, carbon fiber or the like fiber having excellent specific strength and specific rigidity for weight reduction.
The FRP pipe can be obtained by using a general FRP pipe manufacturing method such as a filament winding method or a sheet winding method.

The matrix resin may be a thermosetting resin such as a vinyl ester resin, an unsaturated polyester resin or an epoxy resin, a nylon resin, or another thermoplastic resin, but it is difficult to obtain a member under a high temperature atmosphere. In consideration of the above, it is desirable that the phenol resin has high heat resistance.

The cross-sectional shape of the hollow portion of the FRP pipe may be round, oval, rectangular, triangular or the like.

For the insert jig fitted in the FRP pipe, a metal member, such as steel, stainless steel, or aluminum, which is usually available in the present invention, can be preferably used, but in the present invention, a metal member is used. Instead of a product made of FRP, a product made of FRP can also be used.

Further, the insert jig is provided with a groove portion for holding the expandable filler with the FRP pipe. It is preferable that the groove portion is provided over the entire outer peripheral surface of the insert jig, but the groove portion may be provided on a part of the outer peripheral surface instead of the entire peripheral surface.

Further, by providing a sealing mechanism made of an elastic body such as an O-ring before and after the groove to seal the FRP pipe and the groove, reliable filling and holding can be performed even if the filler is in a liquid state having low viscosity. It is desirable because it becomes possible.

As the filler, one having a property of expanding in volume after being filled in the groove portion of the insert jig is used.
After the filler is filled in the space between the FRP pipe and the groove,
As the volume tries to expand, a radial pressure is generated in the FRP pipe and the insert jig, and FR
The P pipe and the insert jig are mutually supported by the pressing force, and as a result, the FRP pipe and the insert jig are
It is joined by the frictional force between the filler and the inner surface of the FRP pipe.

Here, at least one of the surfaces of the FRP pipe or the portion of the insard jig that comes into contact with the filler is provided with irregularities such as a satin-like shape, a screw shape, a sawtooth shape, splines, and serrations. If so, the frictional force between the FRP pipe and the insert jig is improved, and the joining force is also improved, which is desirable. More preferably, the unevenness is FR
It is provided in a direction that opposes the load direction applied to the P-bonded body.

As the filler, spiro-orthoester resin, which is liquid at the time of filling but hardens when heated and expands in volume, and thermosetting resin mixed with expandable particles can be used. , Quick lime, static crushing agent, expansive mortar, etc. are desirable because they have high heat resistance and high expansion coefficient. Among them, expansive mortar composed of calcium hydroxide, whose main component is inorganic, has dramatically higher heat resistance than organic materials such as resins, and its expansion coefficient is about 300%, which is higher than the above-mentioned organic materials. Therefore, the joining force between the FRP pipe and the insert jig is also increased, which is more desirable.

As a method for surely filling the filler, F
After inserting the insert jig into the RP pipe, make two or more holes in the FRP pipe that communicate with the groove of the insert jig, or make two or more holes in the insert jig that communicate with the groove of the insert jig. The method of injecting the filler through one hole is preferable because it is easy to discharge and confirm the air in the space and the excess filler through the other hole.

The FRP pipe is subjected to the above-mentioned radial force in addition to the tensile, compression, bending, and twisting loads that it bears as a member. Since FRP is an anisotropic material, fibers are laminated in the direction of the applied force. For example, for members that mainly receive tension and bending, 0 ° to ± 30 with respect to the axial direction.
It is desirable that the composition contains 50% or more of 50 ° fibers, and that a member that is mainly subjected to compression has the above-mentioned configuration sandwiched between fibers of ± 45 ° to 90 ° directions. It is desirable that the member that mainly receives the twist contains 50% or more of fibers in the directions of ± 30 ° to ± 60 °.

It is preferable to provide a reinforcing layer on the outer peripheral surface or the inner peripheral surface of the FRP pipe at the fitting portion between the FRP pipe and the insert jig in order to reinforce the radial pressure due to the expansion of the filler. In addition to the outer peripheral surface or the inner peripheral surface of the FRP pipe at the fitting portion between the FRP pipe and the insert jig, one layer or a plurality of layers may be provided inside the FRP pipe at the fitting portion between the FRP pipe and the joining member. The FRP main body pipe may be dispersed and provided between FRP layers.

The reinforcing layer is preferably formed by laminating fibers at an angle that enhances the radial strength of the pipe. The lamination angle of the reinforcing layer is preferably ± 45 ° to 90 ° with respect to the axial direction of the FRP pipe. More preferably, it is laminated in the range of ± 80 ° to 90 °.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an FR according to an embodiment of the present invention.
It is a schematic longitudinal cross-sectional view of a P pipe joined body.

In FIG. 1, metal insert jigs 2 are fitted into the FRP pipe 1 at both ends of the FRP pipe, and the insert jigs 2 are provided with groove portions 3 for filling a filler 6. An O-ring 4 is provided on the entire circumference of the tool 2, and before and after the groove 3 of the insert jig 2 is provided with an O-ring 4 for sealing the fitting surface between the FRP pipe 1 and the insert jig 2. And an example in which the reinforcing layer 5 is provided on the outer peripheral surface of the FRP pipe 1 in the fitting portion of the insert jig 2.

2 and 3 are schematic vertical cross-sectional views of a main part showing an example in which a hole communicating with the groove is provided in the embodiment of FIG.

FIG. 2 shows an example in which the FRP pipe main body 1 is provided with two holes communicating with the groove. The hole 7 is used for injecting a filler, and the hole 7'is exhausted or surplus filled. It is a hole for discharging the agent.

FIG. 3 shows an example in which the insert jig 2 is provided with two holes communicating with the groove portion. The hole 8 is for injecting a filler, and the hole 8'is for exhausting or surplus filling. It is a hole for discharging the agent.

FIGS. 4 and 5 are schematic vertical cross-sectional views of the essential parts of an FRP pipe assembly according to another embodiment of the present invention.

FIG. 4 shows an example in which the reinforcing layer 5 is provided on the inner peripheral surface of the FRP pipe 1 at the fitting portion of the FRP pipe 1 and the insert jig 2, and FIG. 5 shows the FRP pipe 1 and the insert jig 2. An example in which two layers of the reinforcing layer 5 are provided by being dispersed between the FRP layers forming the FRP main body pipe in the FRP pipe in the fitting portion of FIG.

FIG. 6 and FIG. 7 are schematic vertical cross-sectional views of the essential parts showing a concrete example of use of the FRP pipe assembly of the present invention.

FIG. 6 shows a three-way pipe assembly, and FIG.
Shows an example of a propeller shaft.

Example 1 In FIG. 1, the FRP pipe body 1 is a mixture of carbon fiber "Torayca" T300 manufactured by Toray Industries, Inc. and phenol resin "BRL-240", "FRH-30" manufactured by Showa High Polymer Co., Ltd. It is a pipe with an inner diameter of φ70 mm and an outer diameter of φ74 mm that is impregnated and created by the filament winding method. FR
The P pipe body 1 was provided with a reinforcing layer 5 of ± 85 ° with a thickness of 6 mm in a range longer than the insertion length of the metal insert jig 2. The metal insert jig 2 is provided with a groove portion 3 having a radial direction of 5 mm and an axial direction of 50 mm on the entire circumference. In addition, O-rings 4 were provided before and after the groove 3. The groove 3 was filled with a filler 6 made by adding water to "EX GRIPPER" manufactured by Onoda Co., Ltd.

After curing for 48 hours, a tensile test was conducted at room temperature and
It was carried out at 250 ° C. The tensile load was applied through the metal insert jig 2 in the direction shown in FIG. In either case
It did not break under a load of 20 tons, but at a load of 30 tons at 250 ° C.

[0032]

The FRP pipe joined body of the present invention is FR
It is composed of a P pipe, an insert jig inserted into the P pipe, and a filler filled in the groove,
The filler is one whose volume has expanded after filling. Therefore, as compared with the conventional method of fastening the FRP pipe and the metal jig with a bolt and nut, bonding with an adhesive, or a method of threading and fastening them with confidence, joining by press fitting, etc. Since it is high and the heat resistance is improved, it is possible to apply the FRP pipe joined body to a wide range.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an FRP pipe joined body according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of an essential part showing an example in which a hole communicating with a groove is provided in the embodiment of FIG.

FIG. 3 is a schematic vertical sectional view of an essential part showing another example in which a hole communicating with the groove is provided in the embodiment of FIG.

FIG. 4 is a schematic vertical sectional view of an essential part of an FRP pipe joined body according to another embodiment of the present invention.

FIG. 5 is an FR according to still another embodiment of the present invention.
It is a principal part schematic vertical cross-sectional view of a P pipe joined body.

FIG. 6 is a schematic vertical sectional view of an essential part showing a specific example of use of the FRP pipe joined body of the present invention.

FIG. 7 is a schematic vertical sectional view of an essential part showing another specific example of use of the FRP pipe joined body of the present invention.

[Explanation of symbols]

 1: FRP pipe body 2: Insert jig 3: Groove 4: O-ring 5: Reinforcing layer 6: Filler 7,8: Filler injection hole 7 ', 8': Exhaust, excess filler discharge hole

Claims (14)

[Claims] 1. An FRP pipe is fitted with an insert jig, and the insert jig is provided with a groove portion on the fitting surface side with the FRP pipe, and the F groove is provided in the groove portion.
An FRP pipe joined body, which is filled with a filler formed by fitting an RP pipe and an insert jig in a pressed state. 2. The FRP pipe joined body according to claim 1, wherein the insert jig is made of metal. 3. The FRP according to claim 1, wherein the filler is made of a material that expands in volume.
Pipe joint. 4. The filler is selected from spiro orthoester resins, thermosetting resins mixed with expandable particles, cement expanders, quick lime, static crushing agents, or expandable mortar. F according to claim 3, characterized in that
RP pipe joint. 5. The FRP pipe joined body according to claim 1, wherein the surface of the FRP pipe and / or the surface of the insert jig with which the filler comes into contact are provided with irregularities. 6. The FRP pipe or the insert jig is 2
The FRP pipe joined body according to any one of claims 1 to 5, wherein a hole communicating with at least one groove portion is provided. 7. The FRP pipe according to claim 1, wherein a reinforcing layer is provided on an outer peripheral surface or an inner peripheral surface of the FRP pipe in a fitting portion between the FRP pipe and the insert jig. Zygote. 8. The FRP pipe joined body according to claim 1, wherein a reinforcing layer is provided in the FRP pipe at a fitting portion between the FRP pipe and the insert jig. 9. The reinforcing layer comprises reinforcing fibers of ± 4 in the axial direction.
The FRP pipe joined body according to claim 7 or 8, which is an FRP layer wound at 5 ° to 90 °. 10. An FRP adjacent to a groove portion of an insert jig.
The sealing mechanism is provided on a fitting surface between the pipe and the insert jig or on a fitting surface between the reinforcing layer provided on the inner peripheral surface of the FRP pipe and the insert jig.
10. The FRP pipe joined body according to any one of 9 to 10. 11. An FRP pipe is fitted with an insert jig, a groove portion is provided on a side of a surface of the insert jig fitted with the FRP pipe, and the groove portion is filled with a volume-expanding filler. A method for producing an FRP pipe joined body, which comprises expanding the agent. 12. The method for manufacturing an FRP pipe joined body according to claim 11, wherein the insert jig is made of metal. 13. The filler is a spiro orthoester resin,
12. A thermosetting resin mixed with expandable particles, a cement-based expanding agent, quick lime, a static crushing agent, or an expanding mortar, which is selected from the above.
2. The method for manufacturing the FRP pipe joined body according to 2. 14. An FRP pipe or an insert jig is provided with a hole communicating with two or more groove portions, the groove portion is filled with a filler through one hole, and the other hole is exhausted or surplus filled. The method for producing an FRP pipe joined body according to claim 11, wherein the agent is discharged.