JPS61250211A - Reinforcement of frp member of closed cross section - Google Patents

Abstract

PURPOSE:To keep the shape and reduce the weight of FRP members by a method in which FRP member is molded, paired partition walls are inserted into the hollow of the FRP molding, and an adhesive is packed into the gaps between the partition walls to fix the partition walls to the inside of the hollow of the FRP member. CONSTITUTION:An FRP member 11 of closed cross section is molded into a hollow box form having a square hollow 12, and paired partition walls 13 are set at every fixed interval l in the follow 12. An adhesive 14 is packed into apertures 12a between the partition walls 13 facing each other at a small interval delta through charging holes 15 drilled in the inner wall of the aperture 12a. The partition walls can thus be easily and exactly set at every given interval in the hollow even with FRP member of comparatively small inside diameter crossed section.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to FRP (Fibsrglass Re1
This relates to gates using nforced plastics (reinforced plastics), and in particular, a partition wall is provided in the hollow part of an FRP member with a hollow closed cross section.
The present invention relates to a method for stiffening a closed cross-section FRP member having a structure that improves the strength of the RP member.

[Conventional technology]

Since gates are required to have a certain level of strength and rigidity, they have traditionally been made of metal materials (particularly steel) that meet these requirements. However, gates made of metal materials (especially steel)
It had a large weight and had problems with corrosion resistance. For this reason, FRP has a lower specific gravity than metal materials, has excellent corrosion resistance, does not require repainting, and has a certain strength and is easy to form.
Gates have even been invented.

While the FRP gate has the excellent properties mentioned above, the flexural modulus of the FRP material is E, -800 to 1500 k.
g/nn+” (varies due to differences in FRP molding methods, etc.) and is much smaller than the Es of steel material = 21000 kg/mm, so FRP gates have less rigidity and deformation compared to gates made of metal materials (especially steel materials). There are some easy difficulties,
This is one of the fatal drawbacks for gates that require watertightness. Therefore, in order to compensate for this drawback, FR
It is known that the P member is formed into a hollow closed cross section to increase the rigidity of the FRP member.

[Problem that the invention seeks to solve]

By the way, since the above-mentioned closed cross-section FRP member is hollow inside, it is difficult to maintain the shape.

In addition, in a hollow closed cross-section structure, deformation of the shape can lead to local destruction, so in order to avoid this, the entire hollow part of the FRP member is filled with filler to strengthen it. There is.

However, filling the entire hollow part of the FRP member with filler increases the weight of the FRP member and requires a large amount of filler, which has other problems. .

The present invention has been devised in view of the above-mentioned problems and aims to eliminate the problems. A repair for closed-section FRP members that provides partition walls to maintain the shape, thereby preventing local destruction of the member, reducing the weight of the member, and saving material by eliminating the need for fillers. The purpose is to provide a robust method.

[Means for solving problems]

In order to achieve the above object, the present invention molds an FRP member consisting of a hollow closed cross section, and then holds a pair of partition walls facing each other with a small gap therebetween at a constant interval.
The P member was inserted into the hollow part of the FRP member, and then adhesive was filled into the gap formed between the pair of partition walls through the injection hole drilled on the outer surface of the FRP member to fix the partition wall within the hollow part of the FRP member. It consists of a method.

[Effect]

The present invention having the above configuration operates as follows.

That is, even if the closed cross-section FRP member has a relatively small inner diameter, the partition walls can be easily and reliably disposed in the hollow portion at required intervals. The partition walls arranged at necessary intervals serve to maintain the shape of the hollow closed cross-section FRP member. Further, when a reinforcing rod is inserted into the gap filled with adhesive, it acts to more firmly fix the partition wall within the hollow portion of the FRP member.

〔Example〕

Hereinafter, the present invention will be described more specifically based on embodiments shown in the drawings.

Here, Figure 1 shows a closed cross-section FRP with a partition wall in the hollow part.
A perspective view of the member. Figure 2 is a perspective view showing a pair of partition walls facing each other with a small gap held at a constant interval. Figure 3 is a perspective view showing a pair of partition walls facing each other with a small gap held at a constant interval. FIG. 4 is a sectional view of the closed section FRP member.

Reference numeral 11 denotes a closed-section FRP member constituting an FRP gate installed in a waterway to prevent backflow of tides, remove inland water, etc., and the closed-section FRP member 11 has a hollow box-shaped cross-section, It has a certain level of strength and rigidity. Closed section FRP
The member 11 is made of FRP material and is manufactured by continuous forming such as pultrusion, spiral winding, or other forming methods. The hollow part 12 of the closed cross-section FRP member 11 has a rectangular shape, and its inner diameter is approximately 100 to 20 mm.
01, and a pair of partition walls 1 are provided in this hollow portion 12.
3.13 are arranged at regular intervals l. The partition wall 13 has a rectangular shape that is substantially the same as the inner shape of the rectangular hollow portion 12, and the pair of partition walls 13, 13 are arranged in parallel in front and rear with a small clearance δ between them. Each partition wall 13 is disposed perpendicular to the axial direction of the hollow part 12, and the entire peripheral edge of the partition wall 13 is in close contact with the inner wall surface of the hollow part 12. Due to the close partition wall 13,
The shape of the hollow closed cross-section FRP member 11 is maintained. The adhesive 1 is applied to a gap 12a formed in the hollow part 12 by a pair of partition walls 13.13 facing each other with a small gap δ in between.
4 is filled, and the partition wall 13 is filled with this adhesive 14.
is fixed within the hollow part 12. The adhesive 14 is filled into the gap 12a from the outer surface of the closed cross-section FRP member 11 through the injection hole 15 formed in the inner wall surface of the gap 12a formed in the hollow portion 12. Reference numeral 16 denotes an exhaust hole bored from the outer surface of the closed section FRP member 11 to the inner wall surface of the gap 12a formed in the hollow portion 12. This hole is provided to discharge the adhesive 14 to the outside, and the purpose is to completely fill the entire gap 12a with the adhesive 14. Reference numeral 17 is a reinforcing rod, for example, a dowel. The dowel 17 is inserted into the gap 12a from the outer surface of the closed cross-section FRP member 11, and has the function of making the partition wall 13 more firmly fixed. Further, the outer peripheral surface of the dowel 17 is formed with irregularities, thereby strengthening the adhesion of the dowel 17.

FRP is molded using glass fibers such as resin-impregnated strand mats, glass cloth, roving cloth, and roving. The resin used is often unsaturated polyester resin, but epoxy resin or the like may also be used. Note that post-painting can be omitted by performing gel coat treatment if necessary.

Next, a closed cross-section FRP member ll having the configuration of the above embodiment will be described.
A method for arranging the partition wall 13 in the hollow portion 12 will be explained.

First, a hollow closed-section FRP is formed by continuous drawing, spiral winding, etc. or other methods.
A member 11 is manufactured.

Next, partition walls 13 having the same rectangular shape as the inner shape of the hollow portion 12 of the closed cross-section FRP member 11 are made to face each other in parallel in the front-rear direction with a small clearance δ between them. A plurality of the pair of partition walls 13.13 facing each other in this manner are arranged at a constant distance i, and are connected by a spacer 18 to maintain a small clearance δ and a constant distance l. The spacer 18 is connected to each partition wall 13 at a substantially right angle. As shown in FIG. 2, the method of holding the partition wall 13 using the spacer 18 is to insert the partition wall 13 through its approximate center and connect it, or to extend the spacer 18 to a length corresponding to a small clearance δ and a constant distance l. There is a method of cutting the partition walls 13 and gluing the cut spacers 18 approximately at the center of each partition wall 13 to connect them. Another method is the third method.
As shown in the figure, spacers 18 are communicated with the four corners of the rectangular partition walls 13 to maintain each partition wall 13 at a gap δ and a constant distance l. Then, each partition wall 13 is inserted into the hollow portion 12 of the closed cross-section FRP member 11 while maintaining the gap δ and constant interval l using spacers. At this time, the closed-section FRP member 11 is inserted so that the gap 12a between the pair of partition walls 13.13 is located at the injection hole 15 and exhaust hole 16 that have been previously drilled in the closed-section FRP member 11.

After each partition wall 13 is inserted into the hollow part 12, the adhesive 14 is injected from the injection hole 15 to cover the entire gap 12a.
Fill completely. A portion of the filled adhesive 14 penetrates into the periphery of the partition wall 13 that is in close contact with the inner wall surface of the hollow portion 12, and adheres the inner wall surface of the hollow portion 12 and the periphery of the partition wall 13. Each partition wall 13 is connected to the hollow portion 1 by filling the adhesive 14.
Fixed within 2. In addition, in advance, the dowel 17 is
It may be inserted into the gap 12a from the outer surface of the RP member 11 and fixed therein.

If the method described above is used, the inner diameter of the hollow portion 12 is relatively small, for example, about 100 to 200 II + 11, and the partition wall 1 can be formed.
Even in the case of a closed cross-section FRP member 11 in which it is difficult to arrange the partition wall 13 in the hollow portion 12, the partition wall 13 can be easily and reliably arranged in the hollow portion 12 thereof.

In the above embodiment, the cross section of the hollow part 12 of the closed cross section FRP member 11 is rectangular in shape, but the shape is not limited to this shape. For example, the shape is circular, trapezoidal, trapezoidal, etc.
The same applies to elliptical shapes and other shapes. Further, the inner diameter of the hollow portion 12 is not limited to a size of 100 to 200 m+*, and the present invention can similarly be applied to a larger diameter or a smaller diameter.

〔Effect of the invention〕

As is clear from the above description, the closed cross section F according to the present invention
According to the RP member interpolation method, an FRP member having a hollow closed cross section is molded, and then a pair of partition walls facing each other with a small gap are maintained at a constant interval and then inserted into the hollow part of the FRP member. However, the adhesive is then filled into the gap formed between the pair of partition walls through an injection hole drilled in the outer surface of the FRP member, and the partition walls are fixed in the hollow part of the FRP member. , a closed section FI with a relatively small inner diameter? Even if the P member is used, partition walls can be easily and reliably arranged in the hollow portion at required intervals. Therefore, the shape of the hollow closed-section FRP member can be maintained by the partition walls arranged at necessary intervals, thereby preventing local destruction of the FRP member and improving the strength of the member. Effective use becomes possible.

Moreover, unlike conventional fillers that fill the entire hollow part of a closed cross-section FRP member, it is sufficient to arrange partition walls at necessary intervals, so that it is possible to maintain the shape of the closed cross-section FRP member. The increase in weight of the FRP member can be suppressed to the necessary minimum, and a large amount of filler is not required at all, so that material can be saved. In addition, when reinforcing rods are inserted into the gaps filled with adhesive, the partition wall can be more firmly fixed in the hollow part of the FRP member, which brings about extremely novel and beneficial effects. be.

[Brief explanation of drawings]

The drawings show an example of the interpolation method for a closed cross-section FRP member according to the present invention, and FIG. 1 is a perspective view of a closed cross-section FRP member in which a partition is provided in a hollow part, and FIG. FIG. 3 is a perspective view showing a state in which a pair of partition walls facing each other are held at a constant distance; FIG. is a cross-sectional view of a closed cross-section FRP member. [Explanation of symbols] 11: Closed section FRP member 12: Hollow part 12a: Gap 13: Partition wall 14: Adhesive 15: Injection hole 16: ¥n pore 17: Dovetail
18 Nispacer Patent Applicant Nishida Iron Works Co., Ltd. Agent Patent Attorney Tadashi Harasaki (and 2 others) Figure 4

Claims (3)

[Claims] (1) An FRP member having a hollow closed cross section is molded, and then inserted into the hollow part of the FRP member with a pair of partition walls facing each other with a small gap held at a constant interval, and then the FRP member The adhesive is filled into the gap formed between the pair of partition walls through the injection hole drilled on the outer surface of the partition wall.
Closed cross section F characterized by being fixed within the hollow part of the P member
Stiffening method for RP members. (2) A method for stiffening a closed cross-section FRP member according to claim 1, wherein a plurality of partition walls facing each other with a small gap are inserted into the hollow portion of the FRP member while being maintained at a constant interval. (3) A method for stiffening a closed cross-section FRP member according to claim 1, wherein a reinforcing rod is inserted into a gap filled with adhesive.