JPH07276520A - Internally ribbed frp pipe, and manufacture thereof - Google Patents

Abstract

PURPOSE:To lessen the deformation of the sectional shape of a pipe at the portion, at which load is applied, and improve the rigidity of the pipe by a method wherein FRP lattice-like rib, which is made of the same material as the material of FRP pipe and formed by filament winding, is integrally arranged onto the inner surface of the FRP pipe. CONSTITUTION:A winding mold 09 for manufacturing an internally ribbed FRP pipe has a structure, in which the periphery of a pyramid-like center shaft 01 is surrounded by an upper, a lower, a left and a right shrouds 03, 04, 05 and 06 fixed to side plates 07, to which rotating shafts 08 are mounted respectively. The winding mold 09 is set to a filament winding machine so as to wind resin impregnated fiber delivered from fiber winding part, starting from the groove 02 part of the winding mold 09, and fill all the groove 02 part with the resin-impregnated fiber in order to wind the whole winding mold 09 in the resin-impregnated fiber for forming the pipe and finally harden the resin-impregnated fiber. After the predetermined hardening processing, the rotating shafts 08 and the side plates 07 are dismounted. After that, the center pyramidal shaft 01 is extracted and then the right and the left shrouds 05 and 06 are dismounted and finally the upper and the lower shrouds 03 and 04 are dismounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced plastic (hereinafter abbreviated as FRP) pipe used as a lightweight structural material and a method for producing the same.

[0002]

2. Description of the Related Art Filament winding method (hereinafter,
Since it is difficult to dispose ribs inside a pipe in the F / W method), the rigidity was improved by increasing the plate thickness of the pipe. FIG. 9 and FIG. 1 which is the A arrow view.
0 shows a conventional FRP pipe 15 and FIG. 11 shows the winding die 16.

[0003]

[Problems to be Solved by the Invention] FRP by F / W method
Since the pipe can be wound with the winding angle of its fiber in the direction in which stress acts, it is an optimal lightweight structural material.When viewed as a pipe as a whole, a thin plate structure is sufficient, but in the case of a thin plate, Since there is no rigidity as a surface, plate deflection due to the concentrated load M ₀ shown in FIG.
The buckling of the compression panel shown in FIG. 4 and the cross-sectional deformation due to the torsional load shown in FIG. 14 occur. These cause structural failure due to bending stress in the beam orthogonal direction. Therefore, as a result, it is necessary to increase the plate thickness, and the weight is increased accordingly, and the advantage of weight reduction has not been fully utilized. In view of the above-mentioned state of the art, the present invention intends to provide a method for manufacturing the same FRP pipe and a method for manufacturing the same, which does not have the drawbacks of the conventional FRP pipe.

[0004]

The present invention provides (1) an FRP pipe formed by a filament winding method, in which the same quality FRP lattice ribs formed by the same method are integrally formed on the inner surface of the FRP pipe. FRP pipe with internal ribs, which are characterized in that they are arranged in a uniform manner. (2) A resin-impregnated fiber is first added to a winding die configured by arranging a central pyramidal axis of a winding die in a central portion and arranging a separable enclosing plate having grooves forming lattice ribs around its four sides. Wrap until only the groove of the enclosure plate is filled, then wrap the entire enclosure plate with resin-impregnated fiber and cover the entire winding form with the resin fiber until the desired thickness is reached, and then heat or chemically react the resin. A method for manufacturing an FRP pipe with an inner rib, comprising: Is.

[0005]

Since the FRP pipe with internal ribs of the present invention has ribs on the internal surface, the rigidity of the surface against bending stress is improved, and the deformation of the cross-sectional shape of the pipe seen in the portion to which the load is applied is reduced, and The rigidity of is improved.

Further, in manufacturing the FRP pipe with inner ribs of the present invention, a groove for forming ribs on the inner surface is provided in the winding die, so that when the FRP pipe is manufactured by an F / W machine, the structural pipe with ribs is simultaneously formed. Can be manufactured. In designing the inner ribs, the rib height, thickness, and arrangement interval may be determined so as to resist the corner-portion moment M ₀ generated due to the cross-sectional deformation shown in FIGS.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the FRP pipe with inner ribs and the manufacturing method thereof according to the present invention will be described with reference to the drawings. 1 is a partial cross-sectional view of an FRP pipe with internal ribs according to the present invention, FIG. 2 is a side view taken along the arrow A of FIG. 1, FIG. 3 is a partial cross-sectional view of a winding die for manufacturing an FRP pipe with internal ribs, and FIG. 3 is a sectional view taken along the line BB of FIG. 3, FIG. 5 is an explanatory view of rib forming winding by an F / W machine,
FIG. 6 is an explanatory diagram of winding formation of the entire FRP pipe by the F / W machine.

First, a method of manufacturing an FRP pipe with internal ribs will be described with reference to FIGS. 3 and 4
As shown in the drawing, the winding form 09 shown in FIG. 2 has an upper enclosing plate 03 (this one is provided with a grid-shaped groove 02 forming a rib around a pyramidal central axis 01 (which is narrower toward the left side). It is divided into 03-a and 03-b in the division unit A),
Lower shroud 04 (this is split part A 04-a, 04
-B)), right shroud 05, left shroud 06
It has a structure in which the periphery is surrounded with, the side plate 07 is fixed to the side plate with bolts, and the rotary shaft 08 is further attached. This winding form 09
5 is set on the chuck 11 of the F / W machine 10 as shown in FIG.
The resin-impregnated fiber 13 coming out from the fiber winding part 12 (the part that drives the winding part is not shown) of the W machine 10 is first started to be wound from the groove 02 of the winding die 09, and this groove 02 is entirely made of fibers. After being filled with the resin, as shown in FIG. 6, the entire winding form 09 is wound with the resin-impregnated fibers 13 to form a pipe. Next, this is cured by a curing processing device (not shown) or the like.

After the completion of the predetermined hardening treatment, the FRP of the rotary shaft 08 and the side plate 07 is removed by milling or the like to rotate the rotary shaft 0.
8 and the side plate 07 are removed, then the central pyramid axis 01 is extracted to the large diameter side of the pyramid, the right enclosing plate 05 and the left enclosing plate 06 are shifted to the center side, and then removed, and finally the upper enclosing plate 03 and the lower enclosing plate By removing the plate 04, the inner surface ribbed FRP pipe 14 as shown in FIGS. 1 and 2 is completed. 7 shows a state in which the left enclosure plate 06 is moved to the center side in order to take out the FRP finished product, and FIG. 8 shows the left upper enclosure plate of the upper enclosure plates 03 in order to take out the FRP finished product. 0
3 shows a situation where 3-b is moved to the center side.

[0010]

EFFECT OF THE INVENTION By providing ribs on the inner surface of the FRP pipe, it becomes difficult to remove the ribs from the winding form, but the winding form has a structure in which the periphery of the pyramid is surrounded by an enclosing plate provided with rib forming grooves. By doing so, the winding die can be removed after FRP molding, and the FRP pipe with inner ribs can be easily manufactured. In addition, since the FRP pipe with internal ribs has a large bending rigidity of the plate itself that constitutes the pipe, when used as a structural material, it is not necessary to reinforce the supporting portion or the portion on which the load acts, etc., compared to the conventional FRP pipe. It is possible to reduce the weight.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an FRP pipe with internal ribs according to an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a partial cross-sectional view of a winding die for manufacturing an FRP pipe with an inner rib according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB of FIG.

FIG. 5 is an explanatory view of rib forming winding by an F / W machine according to an embodiment of the present invention.

FIG. 6 is an explanatory view of winding formation of the entire FRP pipe by the F / W machine according to the embodiment of the present invention.

FIG. 7 is an explanatory view showing how to remove the side wall after forming the FRP pipe according to the embodiment of the present invention.

FIG. 8 is an explanatory view for removing the upper shroud after forming the FRP pipe according to the embodiment of the present invention.

FIG. 9 is a partial sectional view of a conventional FRP pipe.

FIG. 10 is a view on arrow A in FIG.

FIG. 11 is a partial sectional view of a conventional winding die for manufacturing an FRP pipe.

FIG. 12 is an explanatory diagram of deformation of a conventional FRP pipe due to a concentrated load.

FIG. 13 is an explanatory view of buckling of a conventional FRP pipe due to a compressive load.

FIG. 14 is an explanatory diagram of cross-sectional deformation of a conventional FRP pipe due to a torsion load.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // B29K 105: 08 B29L 23:00 (72) Inventor Yasuo Jinno Hiji Niihama, Arai-cho, Takasago-shi, Hyogo 1-1-1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Inventor Hisashi Sekimoto 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Research Institute

Claims (2)

[Claims] 1. An FRP pipe formed by a filament winding method, wherein the same quality FRP lattice ribs formed by the same method are integrally formed on the inner surface of the FRP pipe. FRP with inner rib
pipe. 2. A resin-impregnated fiber is first applied to a winding die constituted by arranging a central pyramidal axis of a winding die in a central portion and arranging a separable enclosing plate having grooves forming lattice ribs on four sides thereof. Is wound until only the groove of the enclosure plate is filled, and then the entire enclosure plate is wrapped with resin-impregnated fiber and the whole winding die is covered with the resin fiber until a desired thickness is obtained, followed by heat treatment or chemical reaction. A method for manufacturing an FRP pipe with internal ribs, characterized in that the resin is cured by.