JP2681552B2 - Fiber reinforced resin tubular structural member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced resin tubular structural member used for materials such as sports and leisure equipment, including structures such as vehicle ships, bridges, buildings and other structures. It is a thing.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for reduction in the weight of structural members. As a material for structural members, a fiber having a remarkably small specific gravity, which is 1/5 that of steel, and having a high specific strength and a high specific rigidity. Reinforced resin materials are receiving attention. As the structural member, a tubular body having a closed cross section is generally used. Using the fiber reinforced resin material, in order to obtain a tubular structural member having the closed cross section, conventionally, generally, a layer of fiber reinforced resin is formed on the outer periphery of the molding die,
Then, the procedure was carried out by pulling out the molding die in the axial direction of the tube.

In order to provide a reinforcement on the fiber-reinforced resin tubular structural member thus obtained, since the cross section of the pipe is a closed cross section, a reinforcing plate continuous along the axial direction of the tubular structural member. Was provided in the communication hole. Further, conventionally, as shown in FIG. 5, a tubular body having a closed cross section formed by facing the opening surfaces of two U-shaped members and joining the ends of the upper and lower surfaces of the U-shaped member has been joined. Was known.

Further, conventionally, as shown in the cross-sectional view of the pipe of FIG. 6, there has been a tubular body of a plurality of rectangular pipes having an increased strength.

[0005]

Since the conventional structural member made of fiber reinforced resin is a tubular structural member having a closed cross section, the molding die is formed from the layer of the fiber reinforced resin formed on the outer periphery of the molding die. It was a difficult task because it had to be pulled out in the axial direction of the pipe. In addition, due to the manufacturing method, there is a restriction that in order to further provide a reinforcement in the pipe, the reinforcement must be installed in the axial direction. Such a disposition of the reinforcing plate along the axial direction of the pipe gives the directionality to the pipe in terms of strength, and obtains sufficient strength in the vertical transverse direction of the pipe. I couldn't.

Further, the tubular body of FIG. 5 has a structure in which the ends of members having the same upper and lower surfaces are butted against each other, so that the bonding area is small, and therefore the tubular body is often split vertically . In particular , it was not practical for a fiber-reinforced resin tubular structural member . Further, in the tubular body having the cross-sectional structure of FIG. 6, the reinforcing support plate can be arranged in the axial direction of the tubular body, but the reinforcing support plate is arranged in the direction of blocking the communication hole of the pipe. I couldn't do that. Further, in the tubular body having the cross-sectional structure of FIG. 6, the reinforcing support plate can be arranged in the axial direction of the tubular body, but the reinforcing support plate is arranged in the direction of blocking the communication hole of the pipe. I couldn't do that.

Therefore, the present invention does not have the above-mentioned problems, the manufacturing method is easy, the reinforcing material is provided in the tube blocking direction, the weight is light, the rigidity is high, and the bending load is high. It is intended to provide a strong tubular structural member.

[0008]

In order to solve the above problems, the present invention provides a prepreg having long fibers as reinforcing fibers.
Using two or more U-shaped members made of fiber reinforced resin having an upper surface, a side surface, and a lower surface obtained by molding and having an open cross section with one side open, so that the open sides face each other,
A tube having a closed cross section is formed by superposing the upper surface and the lower surface of one U-shaped member 1 on the upper surface and the lower surface of the other U-shaped member 2, and between the superimposed upper and lower surfaces. In addition, a tubular structure member made of fiber reinforced resin is provided in which a reinforcing support plate 5 is arranged perpendicularly to the axial direction of the pipe on an imaginary surface that blocks the communication hole of the pipe. Further, the fiber-reinforced resin tubular structural member of the present invention,
Tapered adhesive bonding surface of U-shaped members
By adding a step or a step
The feature is that it has been resolved.

[0009] The reinforcing support plate 5, et al directed to block the communicating holes of the tubes are perpendicular to each side of the inner surface of the wall constituting the tube, i.e., disposed vertically against the axial direction of the tube To do .
The number and contents of the reinforcing support plates 5 are adjusted and provided at arbitrary intervals according to the application and load of the fiber-reinforced resin tubular structural member of the present invention after assembly. The reinforcing support plate 5 may be simply a flat plate, but it is preferable to have an H beam shape or an I beam shape like the reinforcing support plate 5 shown in FIG.

The U-shaped member 1 is housed in the open groove 4 of the U-shaped member 2, and the upper and lower surfaces of the U-shaped members 1 and 2 are superposed on each other and joined together. Has been converted. For this joining, it is possible to use mechanical means such as bolts and rivets, including adhesive joining with an adhesive, and to use these together, and further, to strengthen this joining, the outer surface or inner surface of the joined body. It is also possible to provide a fiber-reinforced resin layer on the. U-shaped member 1 if necessary
The joint between the upper and lower surfaces of the U-shaped member 2 is shown in FIG.
It is also possible to add a taper or a step as in (2). Further, the external shape of the U-shaped member is not limited to the linear shape, but may be an L-shape, a U-shape, or any other suitable shape.

The closed cross-sectional shape of the fiber-reinforced resin tubular structural member of the present invention is not limited to the quadrilateral shown in the sectional view in FIG. 3 (1), but also the eight sides shown in the sectional view in FIG. 3 (2). Shapes can also be used. As the reinforcing fibers of the fiber-reinforced resin used in the present invention, carbon fibers having high specific strength and high specific elastic modulus are preferable, but other reinforcing fibers can be used or used in combination as needed. On the other hand, the resin is not particularly limited, and any resin that can take advantage of the characteristics of the reinforcing fiber can be used.

The method for manufacturing the U-shaped members 1 and 2 used for the tubular structural member made of fiber reinforced resin of the present invention is manufactured, for example, as follows. Epoxy resin prepreg (curing temperature 130 ° C) in which high-strength type carbon fibers (for example, Vesphite manufactured by Toho Rayon Co., Ltd.) are aligned in one direction.
As illustrated in FIG. 7, the fiber-reinforced resin layer 9 is formed by laminating on the outer surface of the molding die 8 by lay-up and curing the resin. Then, the fiber reinforced resin layer 9 is removed from the molding die 8 to obtain a U-shaped member. The form of the layup is such that unidirectional fiber orientation sheet, woven fabric, etc. are impregnated with resin.
That is , a unidirectional material, a woven material, or other prepreg, depending on the characteristics of the target fiber-reinforced resin tubular structural member.
It is selected appropriately .

[0013]

As described above, the fiber-reinforced resin tubular structural member having the closed cross section of the present invention is formed by combining a plurality of U-shaped members, and the U-shaped members are manufactured. However, it is not necessary to pull out the mold from the tubular structural member, and in order to form a tubular structural member with a closed cross section, a plurality of U-shaped members should be arranged such that their open sides face each other and one Since it can be manufactured by superposing the upper surface and the lower surface of the U-shaped member on the upper surface and the lower surface of the other U-shaped member, the manufacturing is easy.

Further, according to the present invention, the pipe is suspended in the axial direction.
Since the reinforcing support plate is directly provided, it is possible to make the fiber-reinforced resin tubular structural member sufficiently strong against the load from the vertical transverse direction. Furthermore, the fiber-reinforced resin tubular structure member having the closed cross section according to the present invention has high strength and high resistance to bending load because the upper surface and the lower surface are each composed of double fiber-reinforced resin members. Have.

[0015]

Example 1 FIG. 1 is an exploded perspective view of a fiber-reinforced resin tubular structural member of the present invention before assembly. FIG. 2 shows a sectional view of the fiber-reinforced resin tubular structural member of the present invention. In FIG. 1, both 1 and 2 are U-shaped members, and the open groove 3 of the U-shaped member 1 and the U-shaped member 2
The open grooves 4 are arranged so that their open sides face each other. The spacing 6 between the upper and lower surfaces of the U-shaped member 1 is slightly smaller than the spacing 7 between the upper and lower surfaces of the U-shaped member 2 and is designed so that the U-shaped member 1 is just inserted into the open groove 4. It has been produced.

In the open groove 3 of the U-shaped member 1 shown in FIG.
Three H-beam-shaped reinforcing support plates 5 are arranged at intervals in the direction of blocking the communication hole of the pipe and perpendicular to each inner surface of the wall forming the pipe, that is, perpendicular to the axial direction of the pipe. It is provided. The U-shaped member 1 is housed in the open groove 4 of the U-shaped member 2, and the upper surfaces and the lower surfaces of the U-shaped members are overlapped with each other and joined by an adhesive to be integrated.

The fiber-reinforced resin tubular structural member of the present invention comprises:
As shown in FIG. 2, a reinforcing support plate 5 such as a "bamboo knot" is arranged perpendicular to the axial direction of the pipe on an imaginary surface that blocks the communication hole of the fiber-reinforced resin tubular structural member. It is a structure like The fiber-reinforced resin tubular structural member of this example was manufactured as follows. High strength type carbon fibers (Toho Rayon Co., Ltd., Besfite) a U-shaped member which is laid up molded using an epoxy resin based prepreg aligned pull in one direction (curing temperature 130 ° C.) using, FIG As shown in FIG. 1, an H-shaped reinforcing support plate was bonded between the upper and lower wall surfaces of the U-shaped member with an epoxy resin adhesive. Next, this U-shaped member is fitted into the open groove 4 of another U-shaped member, and the upper surface and the lower surface of each U-shaped member are bonded with an epoxy resin adhesive. The fiber-reinforced resin tubular structural member shown in FIG. 2 was obtained by joining.

A three-point bending test was carried out by applying a load to the central portion of the tube with the lower portions of the reinforcing support plates 5 at both ends of the fiber-reinforced resin tubular structural member of this example as fulcrums. The maximum breaking load measured was 500 kg.

[0019]

Example 2 In the same manner as in Example 1, a molded product was obtained in which the number of reinforcing support plates 5 inside the tube was 3 only in the central portion. When this was subjected to the same bending test as in Example 1, the maximum breaking load was 700 kg. [Comparative Example] A molded article without the reinforcing support plate 5 inside the tube was obtained in the same manner as in Example 1, and the same bending test was carried out. The maximum breaking load was 250 kg.

[0020]

As described in detail above, according to the present invention, a prepreg having long fibers as reinforcing fibers is obtained by molding.
The, the virtual plane to block the communicating hole of the fiber-reinforced resin tubular structural member, bending properties of the tube is remarkably improved by providing the reinforcing support plate perpendicular to the axial direction of the tube. The fiber-reinforced resin tubular structure member of the present invention has an upper surface, a side surface, a lower surface, and an open cross section in which one side is open,
Two or more U-shaped members made of fiber reinforced resin are arranged such that their open sides face each other, and the upper and lower surfaces of one U-shaped member and the upper and lower surfaces of the other U-shaped member are mutually opposed. Since a tube having a closed cross section is formed by overlapping, it is not necessary to pull out the molded product from the molding die in the axial direction in the molding of the fiber-reinforced resin tubular structural member, so that the manufacturing is easy. It

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fiber-reinforced resin tubular structural member of the present invention before assembly.

FIG. 2 shows a cross-sectional view of a fiber-reinforced resin tubular structural member of the present invention.

FIG. 3 shows an example of a closed cross-sectional shape of a tubular structure member made of fiber reinforced resin of the present invention.

FIG. 4 shows a joint between upper and lower surfaces of a U-shaped member used in the present invention.

FIG. 5 shows a tubular body having a conventional closed cross section.

FIG. 6 shows a tubular body having a conventional reinforcing support plate disposed therein.

FIG. 7 is a perspective view of a U-shaped member before demolding according to the present invention.

[Explanation of symbols]

 1, 2 U-shaped member 3, 4 Open groove 5 Reinforcement support plate 6, 7 Interval 8 Mold for molding 9 Fiber reinforced resin layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimitsu Tsuru 234 Takaishi, Kamichikari, Nagaizumi-cho, Sunto-gun, Shizuoka Prefecture Toho Rayon Co., Ltd. Research Institute (72) Genki Miyaishi 2-8-chome, Komibun-cho, Kokubunji, Tokyo 38 Goods Japan Railway Technical Research Institute (56) References JP 62-170644 (JP, A) Actual development 48-54610 (JP, U) JP 48-1904 (JP, B1)

Claims (2)

(57) [Claims] 1. A prepreg comprising long fibers as reinforcing fibers is formed.
Two or more U-shaped members made of a fiber-reinforced resin having an open cross section with one side open, which has an upper surface, a side surface, and a lower surface obtained by shaping , and the open sides face each other. A tube having a closed cross section is formed by superposing the upper surface and the lower surface of the U-shaped member on the upper surface and the lower surface of the other U-shaped member, and between the superimposed upper surface and the lower surface, and A tubular structure member made of fiber reinforced resin, characterized in that a reinforcing support plate is arranged perpendicularly to the axial direction of the pipe on an imaginary surface that blocks the communication hole. 2. The adhesive bonding surfaces of the U-shaped members of each other.
The difference in level can be solved by adding a taper or a step.
The fiber reinforced according to claim 1, which is erased.
Resin tubular structural member.