JPH0834074A - Frp pipe joint and production thereof - Google Patents

Abstract

PURPOSE:To increase bonding strength by forming a joint from the inner peripheral surface on which continuous unevenness is formed fitted to the outer peripheral surface of the end part of an inside FRP pipe and an outer peripheral surface to which a screw with which a flange is threaded and a taper part having a continuous uneven surface formed thereto are provided. CONSTITUTION:A joint 3 and an inside FRP pipe 1 are connected in such a state that the screw groove 4 provided to the inner peripheral surface of the joint is bitten in the fiber of the outer peripheral surface of the inside FRP pipe 1. The joint 3 and an outside FRP pipe 8 are connected in such a state that the knurling processing part 6 applied to the outer peripheral surface of the taper part 7 of the joint 3 is bitten in the fiber of the inner peripheral surface of the outside FRP pipe 8. As mentioned above, the inside and outside FRP pipes 1, 8 are connected in such a state that the fiber of the outer peripheral surface of the inside FRP pipe 1 is bitten in the fiber of the inner peripheral surface of the outside FRP pipe 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FRP pipe joint applied to a pressure vessel made of FRP, a pressure pipe, a structural material and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, the FRP pipe joint shown in FIG. 5 is used for connecting an FRP pressure vessel, a pressure pipe, or an FRP pipe as a structural material to another pipe or a structural material. Was there. That is, F that needs to be connected
A so-called filament winding method (hereinafter, referred to as F), in which a glass fiber or the like impregnated with a resin is wound around a pipe forming mold having a recess formed at a position corresponding to an inner surface of an end of the RP pipe to form an FRP pipe. / W method))
The FRP tube 01 with the
/ W method, or another method, at the end of the outer peripheral surface, another FR
Joint 0, which is provided with a male screw groove 04 that is screwed with a female screw groove provided on the inner peripheral surface of the flange for connecting to the P pipe
After manufacturing 3, the joint 03 in which an adhesive is applied to the outer peripheral surface 05 of the other end, which is not provided with the male screw groove 04,
It is manufactured by fitting it into the recess 02 of the FRP pipe 01, integrating the FRP pipe 01 and the joint 03, and then attaching a flange to the joint 03.

However, the FR produced by such a method
In the P pipe joint, one end of the joint 03 is inserted into the recess of the FRP pipe 01, and the outer peripheral surface of the joint 03 at the insertion portion and the FRP pipe 0
Since the 1 recessed portion 02 has an adhesive structure using only an adhesive, the bonding force is merely strength due to the adhesive, and it is necessary to take a large adhesive length (insertion portion), which is a feature of the FRP pipe. It was a conflict with weight reduction.

Further, the outer peripheral surface 0 of the other end of the joint 03 described above
5, directly form FRP tube by F / W method,
There is also a method of manufacturing an FRP joint, but in this case as well, the connection between the flat outer peripheral surface 05 of the other end and the FRP pipe is only due to the bonding force of the resin impregnated in the fiber, so that a strong bonding force is obtained. In order to obtain a high coupling force and to obtain a large coupling force, it is necessary to make a large joint between the joint and the FRP pipe, and although the degree is different, the same problem as described above occurs.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a FRP pipe joint in which the joint and the FRP pipe can be rigidly connected and can be made lightweight, and a manufacturing method thereof. It is an issue.

[0006]

Therefore, the FR of the present invention is
The P pipe joint was the following means. -Inner diameter side FRP formed by winding the resin-impregnated fiber around the inner diameter side FRP tube outer diameter that matches the inner diameter
A tube was installed.・ Inner peripheral surface formed with continuous uneven surface by thread groove or knurling to fit the outer peripheral surface of the end of inner diameter side FRP pipe, and inner peripheral surface of flange for connecting with other FRP pipe joint A screw to be screwed into a thread groove formed on the surface, a screw for fixing the outer diameter side FRP pipe to the outer peripheral surface, or an outer peripheral surface provided with a tapered portion made into a continuous uneven surface by knurling etc. A fitting is provided. -By winding the taper portion provided on the outer peripheral surface of the joint and the outer peripheral surface of the inner diameter side FRP pipe with resin-impregnated fiber, the joint and the outer diameter side FRP pipe integrally formed with the inner diameter side FRP pipe are provided. It was Further, the FRP pipe joint manufacturing method of the present invention employs the following means.・ Inner peripheral surface has inner side FR
Continuous concavo-convex is formed by thread groove for fitting with P pipe or knurling, and other FRP is formed on the outer peripheral surface.
A screw that engages with the thread groove provided on the inner peripheral surface of the flange for joining with the pipe joint, a screw for fixing the outer diameter side FRP pipe, or a tapered portion that has a continuous uneven surface by knurling etc. The process of manufacturing each formed joint. A step of manufacturing the inner diameter side FRP pipe by winding the resin-impregnated fiber around a pipe molding die or the like whose outer diameter is the same as the inner diameter shape of the inner diameter side FRP pipe.・ After manufacturing the inner diameter side FRP pipe, before the resin impregnated into the fiber is cured, the inner diameter side F
Fit the inner peripheral surface of the joint on the outer peripheral surface of the end of the RP pipe, and
The process of integrating the RP pipe and the joint. A resin-impregnated fiber is wound around the outer peripheral surface taper portion of the joint integrated with the inner diameter side FRP pipe and the outer peripheral surface of the inner diameter side FRP pipe where the joint is not fitted to form a joint, the inner diameter side FRP pipe. The process of manufacturing the outer diameter side FRP pipe integrally molded with.

[0007]

The FRP pipe joint of the present invention and the manufacturing method thereof are
By adopting the above-mentioned means, the wound fiber layer forming the outer peripheral surface of the inner diameter side FRP pipe is made to bite into the continuous uneven surface formed on the inner peripheral surface of the joint, and the joint is moved to the inner diameter side. FRP
It can be fixed to the outer peripheral surface of the end of the tube. That is, in addition to the adhesive force of the resin impregnated in the fiber that acts on the joint between the joint and the inner diameter side FRP pipe, the shearing force of the fiber eroded by the continuous uneven surface of the joint serves as the bonding force between the joint and the inner diameter side FRP pipe. Since it works, the joint and the inner diameter side FRP pipe can be joined with a large joining force with a small joining area.

Further, the resin-impregnated fiber is wound from the tapered portion of the outer peripheral surface of the joint fitted to the outer peripheral surface of the inner diameter side FRP pipe to the outer peripheral surface of the inner diameter side FRP pipe where the joint is not fitted. Since the outer diameter side FRP pipe is provided, the joint taper portion and the outer diameter side FRP pipe, and the inner diameter side FRP pipe and the outer diameter side F
The joint part of the RP pipe has a resin bonding force, bites into the fiber layer of the outer diameter side FRP pipe of the continuous uneven surface of the taper part, and the outer diameter side F of the fiber protruding to the outer peripheral surface of the inner diameter side FRP pipe.
By the biting into the fiber layer forming the inner peripheral surface of the RP pipe, the shearing force of each fiber becomes the binding force at the joint between the joint and the outer diameter side FRP pipe, and the inner diameter side FRP pipe and the outer diameter side FRP pipe. Working, small joint area, inner diameter side FRP pipe,
The joint and the outer diameter side FRP pipe can be joined together with a large bonding force.

Therefore, it is possible to obtain a FRP pipe joint which is lightweight and has a large coupling strength.

[0010]

Embodiments of the FRP pipe joint of the present invention and an embodiment of a method for manufacturing the FRP pipe joint will be described below with reference to the drawings.

FIG. 1 is a sectional view and a side view showing a first embodiment in which the present invention is applied to a small-diameter FRP pipe joint, and FIG.
FIG. 3 is a perspective view showing a part of the joint shown in FIG. 1. As shown in the figure, a fiber pre-impregnated with a resin is wound around a pipe molding die 2 having an outer peripheral surface that is the same as the inner peripheral surface of the inner diameter side FRP pipe 1 to be molded. The FRP pipe 1 is manufactured. This production is performed by the F / W method, in which the fiber to which a constant tension is applied is wound around the rotating tube molding die 2.

On the other hand, as shown in FIG. 2, a thread groove 4 is machined on the inner peripheral surface, and a screw 5 which engages with the thread groove machined on the inner peripheral surface of a flange (not shown) is formed on the outer peripheral surface at one end. , Screw 5
The knurling process 6 is applied to the outer peripheral surface on the side opposite to the end portion provided with, and the FRP joint 3 provided with the tapered portion 7 whose diameter is reduced toward the end surface is manufactured. This joint 3 is F
Although it can be manufactured by the / W method, it may be manufactured by another molding method.

The inner peripheral surface of the joint 3 in which the resin is hardened and in which the thread groove 4 is processed is manufactured by the outer peripheral surface of the pipe molding die 02, and the resin impregnated into the fiber is not cured. The FRP tube 1 on the inner diameter side is fitted onto the outer peripheral surface from the side end. In this case, the fitting is continued until the side end of the screw 5 provided on the outer peripheral surface of the joint 3 and the side end of the inner diameter side FRP pipe 1 are aligned.

Although the outer peripheral surface taper portion 7 of the joint 3 is shown to be knurled 6, it may be a screw or a continuous uneven surface.

The screw provided on the outer peripheral surface of the joint 3 and the knurling 6 are processed before the joint 3 is fitted into the inner diameter side FRP pipe 1. It may be processed after it is fitted into the pipe 1.

After fitting the inner peripheral surface of the joint 3 to the outer peripheral surface of the inner diameter side FRP pipe 1, the outer peripheral surface where the joint 3 is not fitted,
The resin-impregnated fiber is wound by the W / F method from the front (right side in FIG. 1) to the rear to form the outer diameter side FRP tube 8. Also, the inner diameter side FR up to the position where the fitting 3 is fitted
The fiber wound around the outer peripheral surface of the P tube 1 is continuously wound around the tapered portion 7 having the outer peripheral surface subjected to the knurling process 6, and further beyond the rear end of the tapered portion 7 to the rear of the tapered portion 7. The outer diameter side FRP pipe 8 is formed on the outer peripheral surface of the joint 3 by winding the fiber up to the recess 9 on the outer peripheral surface between the end and the screw 5 forming portion. In particular, the concave portion 9 is made thicker by increasing the number of laminated layers than the tapered portion 7.

Further, a circle is formed on the outer peripheral surface of the outer diameter side FRP pipe 8 formed on the outer peripheral surface of the inner peripheral side FRP pipe 1 adjacent to the concave portion 9 of the joint 3, the tapered portion 7, and the tapered portion 7. The circumferential winding 10 is provided to firmly adhere the outer diameter side FRP pipe 8 to the joint 3. In this way, after forming the preform of the FRP pipe joint, the resin impregnated in the fiber is cured. Finally, the pipe forming mold 2 inside the inner diameter side FRP pipe 1 is removed to complete the FRP pipe joint.

Next, a second embodiment in which the present invention is applied to an FRP pipe joint for large diameter pipe will be described with reference to FIGS. 3 and 4. FIG.
FIG. 4 is a sectional view and a side view of the present embodiment, and FIG. 4 is a perspective view of the joint shown in FIG. In the FRP pipe joint for large diameter shown in the figure, the FR for small diameter described in FIGS. 1 and 2 is used.
Like the P pipe joint, the outer peripheral surface of the inner diameter side FRP pipe 1 molded on the outer peripheral surface of the preforming pipe molding die 2 is manufactured in two parts, and the inner peripheral surface is knurled 4 ', A screw 5 threadedly engaged with a thread groove formed on the inner peripheral surface of the flange at one end of the outer peripheral surface, and a taper screw threadedly engaged with an inner diameter taper thread groove 16 processed at the inner peripheral surface of a socket 15 described later at the other end. 11 mounts the joint material 17 provided respectively,
Taper screw 11 of joint material 17 and socket 1 shown in FIG.
The joint 3 is configured by screwing the inner diameter taper screw groove 16 formed on the inner peripheral surface of the pipe 5.

The outer peripheral surface of the socket 15 is knurled. Next, similarly to the small diameter FRP pipe joint shown in FIGS. 1 and 2, after forming the outer diameter side FRP pipe 8 and the circumferential winding 10, the resin is cured and the pipe forming mold 2 is formed. Is removed from the inner diameter side FRP pipe 1, and the FRP pipe joint is completed.

In the present embodiment, the knurling 4'applied to the inner peripheral surface of the joint material 3'and the socket 15 are used.
The knurling process 6 applied to the outer peripheral surface may be a thread groove or a screw, and the essential point is that it be formed on a continuous uneven surface.

In any of the above-mentioned embodiments, the joint 3 with the thread groove 4 or the knurling 4'provided on the inner peripheral surface of the joint 3 bites into the fibers on the outer peripheral surface of the inner diameter side FRP pipe 1. 3 and the inner diameter side FRP pipe 1 are joined, and the knurling 6 respectively applied to the tapered portion 7 of the joint 3 or the outer peripheral surface of the socket 15 is the fiber of the inner peripheral surface of the outer diameter side FRP pipe 8. Fitting 3 and outer diameter side FRP pipe 8
Are connected to each other, and the fibers on the outer peripheral surface of the inner diameter side FRP pipe 1 bite into the fibers on the inner peripheral surface of the outer diameter side FRP pipe 8, the inner diameter side FRP pipe 1 and the outer diameter side FRP pipe 8 are The FRP pipe 8 on the outer diameter side is firmly attached to the joint 3 by the inner winding 10, and the tapered portion 10
Since the outer diameter side FRP pipe 8 and the circumferential winding 10 laminated in the recess at the rear of the block prevent the joint 3 from moving in the axial direction, the inner diameter side FRP pipe 1, the joint 3, and the outer diameter side FRP pipe. 8 is
Firmly integrated.

Therefore, it is not necessary to increase the length of these joints to increase the joint strength, and a sufficient joint strength can be obtained by the joints of the small sections. As a result, it is possible to obtain an FRP pipe joint that can sufficiently reduce the weight, which is a feature of the FRP pipe.

[0023]

As described above, the manufacturing method of the FRP pipe joint of the present invention and the FRP obtained by the manufacturing method.
The pipe joint has an inner diameter side F due to the structure described in the claims.
In the wound fiber layer forming the outer peripheral surface of the RP pipe, the continuous uneven surface formed on the inner peripheral surface of the joint is bited,
The joint can be fixed to the end of the inner diameter side FRP pipe, and in addition to the adhesive force of the resin impregnated in the fiber working at the joint between the joint and the inner diameter side FRP pipe, the fiber that the continuous uneven surface of the joint erodes Shearing force acts as a coupling force between the joint and the inner diameter side FRP pipe,
The joint and the inner diameter side FRP pipe can be joined with a large joining force with a small joining area.

Further, from the tapered portion of the outer peripheral surface of the joint to the inner diameter side F
A resin-impregnated fiber is wound around the outer peripheral surface of the RP pipe to provide an outer diameter side FRP pipe, and the outer diameter side FRP pipe and the joint taper portion and the inner diameter side FRP pipe are coupled by a resin. In addition, biting into the fiber layer forming the outer peripheral surface of the inner diameter side FRP pipe of the continuous uneven surface of the tapered portion, and the inner diameter side FR
When the fibers protruding on the outer peripheral surface of the P pipe bite into the fiber layer forming the inner peripheral surface of the outer diameter side FRP pipe, the shearing force of each fiber causes the joint, the inner diameter side FRP pipe, and the outer diameter side FRP pipe. Since it acts as a coupling force of the joint and the joint portion of the inner diameter side FRP pipe, the inner diameter side FRP pipe, joint,
And the outer diameter side FRP pipe can be joined with a large bonding force.

Therefore, the FRP pipe joint which is lightweight and has a large bonding strength can be obtained, and the weight of the FRP product can be reduced.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of an FRP pipe joint of the present invention,
The upper half is a cross-sectional view and the half is a side view.

FIG. 2 is a perspective view showing a part of the joint of the embodiment shown in FIG.

FIG. 3 is a diagram showing a second embodiment of the present invention, in which the upper half is a sectional view and the lower half is a side view.

FIG. 4 is a perspective view showing a joint of the embodiment shown in FIG.

FIG. 5 is a view showing a conventional FRP pipe joint, in which an upper half is a cross-sectional view and a lower half is a supplemental view.

[Explanation of symbols]

 1 Inner Diameter Side FRP Pipe 2 Tube Mold 3 Joint 4 Thread Groove 5 Screw 4'6 Knurling 7 Tapered Part 8 Outer Diameter Side FRP Pipe 9 Joint Outer Recess 10 Cylindrical Winding 11 Taper Screw 15 Socket 16 Inner Diameter Tapered Thread Groove 17 Joint material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:24

Claims (2)

[Claims] 1. An inner diameter side FRP pipe formed by winding a fiber impregnated with a resin, an inner peripheral surface formed with a continuous uneven surface and fitted to an outer peripheral surface of an end portion of the inner diameter side FRP pipe, and a flange. Formed by winding resin-impregnated fibers on the outer peripheral surface of the taper portion and the inner diameter side FRP pipe, and a joint having an outer peripheral surface provided with a screw to be screwed and a continuous uneven surface FRP pipe joint characterized by comprising an outer diameter side FRP pipe. 2. A step of producing a joint having a continuous concave-convex surface on an inner peripheral surface, a screw for screwing a flange on an outer peripheral surface, and a tapered portion having a continuous concave-convex surface, respectively, and a step of manufacturing a pipe forming mold. A fiber impregnated with resin is wound around the outer circumference, and the inner diameter side FR
A step of manufacturing a P pipe, a step of fitting the inner peripheral surface of the joint to the end outer peripheral surface of the inner diameter side FRP pipe before the resin impregnated in the fiber is cured, and an outer periphery of the inner diameter side FRP pipe. surface,
And a step of manufacturing the inner diameter side FRP pipe and the outer diameter side FRP pipe integrated with the joint by winding a resin-impregnated fiber around the tapered portion of the joint fitted to the outer peripheral surface. A method for manufacturing an FRP pipe joint, which is characterized in that