JPH09170292A - Composite structure of frp structure body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a performance by applying the constitution that a plurality of frame members are kept in contact like a parallel form with the inside of two FRP panels arranged in such a state as faced to each other at the prescribed gap for forming inner space, and laying a core material between the frame members. SOLUTION: The occurrence of buckling is restrained with frame members 3 made of a drawn FRP material, and the frame members 3 are bonded to and integrated with a flat plate 2 and a corrugated plate 2, thereby improving rigidity and eliminating the need of thickening a core material 4 more than necessary. Also, the frame members 3 are bonded to the flat plates 1 and 2, thereby ensuring resistance against separation and continuity in strength. In addition, overall thickness is restrained to a value approximately equal to the thickness of the frame members 3, thereby allowing the effective use of space. Also, when rigidity approximately equal to the case of the conventional structure is applied, weight can be reduced, and no trouble is required for manufacture, as a drawn material is commercially available on the market. The core material 4 made of expanded urethane or the like also provides a heat and sound insulating function as well as a shading function. According to this construction, various types of performances can be improved and cost can be reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a composite structure of FRP structures.

[0002]

2. Description of the Related Art As a structure of a structure used for an upper structure of a ship, such as a floor or a wall, a single plate structure with a bone, a sandwich structure, and a structure in which a bone member is attached to the sandwich are known. FIG. 15, FIG. 16 and FIG. 17 are cross-sectional views of a structure having a single plate structure with bone, a sandwich structure, and a structure in which a bone member is attached to the sandwich.

As shown in FIG. 15, the bone-attached veneer structure has the following structure.
The convex portions 51 are formed on one surface of the flat FRP plate 50 at predetermined intervals.
The FRP plate 51 with a hat having a formed therein is attached, and the core material 52 is placed in the gap between the convex portion 51a and the flat FRP plate 50, and the convex portion 51a serves as a bone. Then, the production of the veneered single plate structure is generally performed by a hand lay-up method manually performed by a person.

In the sandwich structure, as shown in FIG. 16, two flat plate-like FRP plates 54 and 55 are opposed to each other with a predetermined distance therebetween, and a core material 56 is sandwiched between the FRP plates 54 and 55. It is a structure put in. Therefore, there is no bone member in this sandwich structure,
The rigidity is increased by increasing the thickness of the plates 54 and 55 and the core material 56.

Further, as shown in FIG. 17, in the structure in which the bone members are attached to the sandwich, the bone members 57 made of square prism tubes are attached at predetermined intervals to one surface of the sandwich structure shown in FIG. It is a thing.

[0006]

However, the above-mentioned conventional structure has the following problems. That is,
In the single-plate structure with bones, since the convex portion 51a is made of the FRP plate, the amount of the FRP plate used increases and the overall weight becomes heavy. Therefore, it is difficult to reduce the weight. In addition, since it is manually manufactured, it takes time and labor to manufacture it. Further, since the single plate portion is thin, there is a problem that the heat insulating effect is small, the sound insulating effect is small, and the light shielding property is poor.

Further, in the above sandwich structure, since there is no bone member, the bending is large and buckling is likely to occur. Therefore, in order to secure sufficient strength, it is necessary to make the plate extremely thick, and in this case, there is a problem in that it is disadvantageous in space and the like.

Further, in the structure in which the bone member is attached to the above sandwich, the total thickness is the sum of the thickness of the sandwich structure and the thickness of the bone member 57.
It will take up space. Further, since the sandwich and the bone member 57 are joined to each other only on one side surface of the bone member 57, the joint area is small and there is a risk of peeling off the adhesive portion. Further, since the bone member 57 is joined to only one side of the sandwich, it does not sufficiently transmit the force to the other side, has poor strength continuity, and cannot be said to be a structure that efficiently exerts strength.

As described above, the conventional FRP structural material has high strength,
The space, weight, heat insulation effect, sound insulation effect, light shielding effect, and cost were not all satisfied. The present invention has been made to solve such problems, and has the above-mentioned strength, space, weight, heat insulating effect, sound insulating effect, light shielding property,
The purpose is to provide a composite structure of FRP structures that satisfies all of the costs.

[0010]

A composite structure of an FRP structure according to the present invention comprises two FRP plates which are spaced apart by a predetermined distance and are opposed to each other, and abutting on the inner surfaces of the two FRP plates,
It is provided with a plurality of juxtaposed bone members that define an internal space between them, and a core material arranged between the plurality of bone members.

Further, the bone member is characterized by being a hollow body.

Further, a plurality of ridges having an outer surface protruding and an inner surface recessed are formed on at least one of the two FRP plates, and a part of each bone member is formed by the inner surface recesses of the plurality of ridges. Each is wrapped up.

Further, the bone member is characterized by being an FRP drawn material.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an FR of an embodiment of the present invention.
It is a perspective view of a P structure. In the figure, 1 is a flat plate of FRP, and 2 is an FR which is arranged to face the flat plate 1 at a predetermined distance.
It is a stepped plate of P and has a plurality of ridges 2a having an outer surface protruding and an inner surface recessed. Reference numeral 3 denotes a skeleton member made of a rectangular tubular FRP drawing material, which is arranged between the flat plate 1 and the stepped plate 2 by inserting a part thereof into the recess 2b of the stepped plate 2. Reference numeral 4 is a core material interposed between the bone members 3. The bone member 3 has one side surface bonded to the inner surface of the flat plate 1, the other side surface bonded to the recess 2b of the stepped plate 2, and the other two side surfaces bonded to the core material 3.

A glass mat laminated FRP plate is used for the flat plate 1 and the stepped plate 2, and a plastic foam material such as urethane foam material, acrylic foam material or vinyl chloride foam material is used for the core material 4. It is not limited to. Further, as a method of manufacturing the FRP structure, in the above description, the two FRP plates 1 and 2 are manufactured in advance, and the core material 4 and the bone member 3 are adhered to them. The FRP plate 2 may be formed by disposing the skeleton member 3 and the core material 4 on the upper surface of 1 and stacking the FRP on the upper surfaces thereof.

FIG. 2 is a sectional view of the present embodiment shown in FIG. In the present embodiment configured as described above,
As shown in FIG. 2, since the hollow bone member 3 is interposed between the flat plate 1 and the stepped plate 2, and the bone member 3 is in contact with both the flat plate 1 and the stepped plate 2, When an external force acts on the FRP structure, the composite rigidity is effective, and bending and buckling are suppressed. In addition, since the bonding surface between the bone member 3 and the flat plate 1 and the stepped plate 2 is wide, peeling of the bonded portion is suppressed, and bending and tensile strength are improved. Furthermore, a plurality of bone members 3
The core material 4 interposed between the cores enhances the effects of sound insulation, light shielding, and heat insulation.

As described above, the present embodiment has various advantages, which will be described in more detail in relation to the three structures shown in the conventional example. First of all, when compared to a veneer with bone,
If the same degree of rigidity is provided, the weight can be reduced. Further, since the drawn material is commercially available as an industrial product, it does not take much time to manufacture as compared with the hand layup method. Further, since the core material is used, it is excellent in heat insulating effect, sound insulating effect and light shielding property. Also, since the drawing material is commercially available at a relatively low price as an industrial product,
Cost can be suppressed.

Further, compared with the sandwich structure, since the bone member 3 is interposed, buckling is less likely to occur. Also,
The bone member 3 is in contact with both the flat plate 1 and the stepped plate 2,
Since these three members integrally create rigidity, the core material does not have to be made thicker than necessary.

Further, as compared with the structure in which the bone member is attached to the sandwich, the total thickness can be suppressed to the thickness of the bone member 3, so that the space can be effectively used.
Further, since the skeleton member 3 is interposed between the flat plate 1 and the stepped plate 2 and is bonded to both plates, the bonded portion is unlikely to peel off and the reliability as a material is high. Further, since the skeleton member 3 is in contact with both the flat plate 1 and the stepped plate 2, the strength continuity is excellent.

Next, by comparing the mechanical properties of the structure of this embodiment with those of the conventional example, its superiority will be concretely shown. FIG. 3 is a graph showing a comparative example of the rigidity EI of the structure of the present embodiment, the sandwich structure, and the veneered single plate in the case where the weights are the same. The dimensions of each structure used in this comparative example are as follows. (1) Sandwich structure Width: 450mm Thickness: 29mm FRP plate thickness: 2.9mm (2) Bone veneer width: 450mm Veneer thickness: 11mm Bone bottom width: 80mm Bone top width: 80mm Bone thickness: 80 mm (3) Structure of this embodiment Width: 450 mm Core material mounting portion thickness: 25 mm Bone width: 80 mm FRP plate thickness: 2.9 mm FRP drawn material width: 75 mm FRP drawn material height : 75 mm FRP drawn material thickness: 5 mm As can be seen from FIG. 3, the rigidity EI of this embodiment is larger than that of the other materials.

According to the beam theory, the maximum deflection amount y _max is given by the following equation when a uniformly distributed load acts when supporting both ends.

[0022]

[Equation 1]

According to the above equation, when the load is applied under the same conditions, the larger the rigidity EI, the smaller the maximum deflection amount y _max can be suppressed. As described above, in the present embodiment, as compared with the sandwich structure or the single plate structure with bone,
Since the rigidity EI is extremely large when the weights are the same, the maximum deflection amount y _max can be suppressed to a small value.

Regarding the bending buckling of a column having a uniform cross section subjected to a central compressive load, Euler's equation gives an elastic buckling stress σ _cr as follows.

[0025]

(Equation 2)

According to the above equation, when a load is applied under the same condition, the elastic buckling stress σ _cr can be increased as the rigidity EI is increased, and the buckling can be suppressed. As described above, in the present embodiment, the rigidity E when the weight is about the same as that of the sandwich structure or the single plate structure with bones is obtained.
Since I is extremely large, the elastic buckling stress σ _cr can be increased and buckling can be suppressed.

FIG. 4 is a graph showing a comparative example of the section modulus Z between the sandwich and the veneered veneer according to the present embodiment when the weights are about the same. The dimensions of each structure used in this comparative example are the same as in FIG. By the way, the bending stress σ when a bending moment acts on the beam can be obtained by the following equation.

[0028]

(Equation 3)

In the above equation, when the bending moment M is applied under the same conditions, the bending stress σ increases as the section modulus Z increases.
It can be made smaller. In the present embodiment, as described above, since the section modulus Z at the same weight is large, the bending stress can be suppressed as compared with the sandwich or the single plate structure with bone. As described above, the structure of this embodiment is superior in mechanical properties to that of the conventional example.

Various embodiments can be considered for the composite structure of the FRP structure according to the present invention by changing the shape of the bone member or the shape of the FRP plate. Therefore, an embodiment in which the one shown in FIG. 1 is modified is shown below. FIG. 5 is a sectional view of another embodiment of the present invention. In the figure, the same parts as those in FIG. The same applies to the following embodiments. In the present embodiment, a core member 3 and a skeleton member 3 made of a square tubular FRP drawing material are arranged at predetermined intervals between flat plates 5 and 6 of the FRP.

FIG. 6 is a sectional view of another embodiment of the present invention. In this embodiment, the FRP plates on both sides are the stepped plates 7 and 8 similar to those shown in FIG. According to the present embodiment, ribs are formed on the FRP plates on both sides, so that the rigidity can be further increased.

FIG. 7 is a sectional view of another embodiment of the present invention. In the present embodiment, the bone member has a cylindrical shape and the projections of the stepped plate have an arc shape in the structure shown in FIG. , 9 are stepped plates, 9a are ridges, and 10 are bone members.

FIG. 8 is a sectional view of another embodiment of the present invention. In this embodiment, the bone member has a cylindrical shape in the structure shown in FIG. Reference numeral 11 indicates a bone member.

FIG. 9 is a sectional view of another embodiment of the present invention. In the present embodiment, the bone member has a cylindrical shape and the projection of the stepped plate has an arc shape in the configuration shown in FIG. , 12, 13 are stepped plates, 12a, 1
Reference numeral 3a denotes a ridge, and 14 denotes a bone member.

FIG. 10 is a sectional view of another embodiment of the present invention. The present embodiment is the same as that shown in FIG.
The bone member has an arc shape. Reference numeral 15 indicates a bone member.

FIG. 11 is a sectional view of another embodiment of the present invention. In the present embodiment, the stepped portion of the stepped plate 2 shown in FIG. 1 has a trapezoidal cross section. Reference numeral 16 indicates a stepped plate.

FIG. 12 is a sectional view of another embodiment of the present invention. In the present embodiment, the upper surface of the ridge 2a of the stepped plate 2 shown in FIG. 1 is cut off. Reference numeral 17 denotes a stepped plate whose upper surface is cut off.

FIG. 13 is a sectional view of another embodiment of the present invention. In the present embodiment, the height of the ridge 2a of the stepped plate 2 shown in FIG. 1 is increased, and a skeleton member made of a square tubular FRP drawn material is arranged in two steps at this step portion. It is a thing. Reference numeral 18 denotes a bone member arranged in two layers.

FIG. 14 is a sectional view of another embodiment of the present invention. In the present embodiment, in the structure shown in FIG. 12, an I-shaped bone member 19 in which a channel member having a U-shaped cross section is back-to-back is used in place of the bone member 3 made of a square tubular FRP drawing material. It was what I had. The various embodiments described above are appropriately selected according to conditions such as the connection with other members depending on the use location.

[0040]

As described above, according to the present invention, a plurality of bone members that contact the inner surfaces of two FRP plates that are separated by a predetermined distance and are opposed to each other to define an internal space therebetween. Since the core member is provided between the plurality of bone members, a structure excellent in strength, space, weight, heat insulating effect, sound insulating effect, light shielding property, and cost can be obtained.

Further, since the bone member is a hollow body, the weight can be further reduced.

Further, at least one of the two FRP plates is formed with a plurality of ridges having an outer surface protruding and an inner surface recessed, and the inner surface recesses of the plurality of ridges form a part of each bone member. Since it is wrapped, ribs are also formed on the FRP plate, and the rigidity can be further increased.

Further, since the bone member is made of the FRP drawn material, the strength can be further increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of a structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the structure according to the embodiment of the present invention shown in FIG.

FIG. 3 shows the rigidity E of the structure of the present embodiment, the sandwich structure, and the veneered veneer when the weights are about the same.
It is a graph which shows the comparative example of I.

FIG. 4 is a graph showing a comparative example of the section modulus Z of the sandwich of the present embodiment and the sandwich and the veneered veneer in the case where the weights are the same.

FIG. 5 is a cross-sectional view of another embodiment of the present invention.

FIG. 6 is a cross-sectional view of another embodiment of the present invention.

FIG. 7 is a cross-sectional view of another embodiment of the present invention.

FIG. 8 is a cross-sectional view of another embodiment of the present invention.

FIG. 9 is a cross-sectional view of another embodiment of the present invention.

FIG. 10 is a cross-sectional view of another embodiment of the present invention.

FIG. 11 is a cross-sectional view of another embodiment of the present invention.

FIG. 12 is a cross-sectional view of another embodiment of the present invention.

FIG. 13 is a cross-sectional view of another embodiment of the present invention.

FIG. 14 is a cross-sectional view of another embodiment of the present invention.

FIG. 15 is a cross-sectional view showing a conventional single plate structure with bone.

FIG. 16 is a cross-sectional view showing a conventional sandwich structure.

FIG. 17 is a cross-sectional view showing a structure in which a bone member is attached to a conventional sandwich.

[Explanation of symbols]

1,5,6 Flat plate 2,7,8,9,12,13,16,17 Stepped plate 3,10,11,14,15,18,19,57 Bone member 4,52,56 Core material 50,54 , 55 FRP plate 51 FRP plate with hat 51a Convex part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Kato 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (4)

[Claims] 1. Two Fs which are separated by a predetermined distance and are opposed to each other.
RP plates, a plurality of juxtaposed bone members that abut the inner surfaces of these two FRP plates to define an internal space therebetween, and a core material arranged between the plurality of bone members. And a composite structure of an FRP structure. 2. The composite structure of the FRP structure according to claim 1, wherein the bone member is a hollow body. 3. A plurality of protrusions having an outer surface protruding and an inner surface recessed are formed on at least one of the two FRP plates, and the inner surface recesses of the plurality of protrusions form a part of each bone member. The composite structure of the FRP structure according to claim 1 or 2, characterized in that each of the FRP structure and the FRP structure is encapsulated. 4. The composite structure of the FRP structure according to claim 1, wherein the skeleton member is an FRP drawing material.