JP2000336777A - FRP joint structure - Google Patents

Abstract

(57) [Summary] F is a disadvantage of the joining structure in the prior art.
The joining portion is configured to prevent the surface pressure destruction of the RP member, and in order to further strengthen the joining of the FRP member, the joining of the FRP member is performed via a joining member of another material installed inside the FRP member. In addition to providing a joint structure made of FRP suitable for building members and the like, focusing on the problems of conventional relatively small roofing materials, it can be constructed in a short period of time and can be constructed advantageously in terms of cost Provided is a roof structure made of FRP suitable for construction of a large-sized roof. An FRP member has a FRP member inside a joint portion thereof.
A joint structure made of FRP, wherein a joint member made of a material different from the material is installed, wherein the FRP member is joined via the joint member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure made of FRP, and more particularly to a joint structure made of FRP which is suitable as a large building member, especially a large roof structure made of FRP.

[0002]

2. Description of the Related Art To join FRP members to each other, usually,
A so-called lap joint method in which a plate or a metal plate of the same material is arranged on the upper and lower surfaces of the FRP member and fastened with bolts or the like penetrating the FRP member is adopted. As another method, the FRP members may be joined to each other using an adhesive.

Further, for example, when FRP is used for a roof member, a metal frame is used as a base, and a relatively small FRP member is used as a roofing material thereon.

[0004]

However, when the FRP members are joined to each other by using the plates arranged on the upper and lower surfaces as described above, a hole penetrating the FRP member in the thickness direction thereof is provided. However, there is a problem that the strength of the FRP member itself is reduced.

[0005] An example of the above problem is disclosed in Japanese Patent Laid-Open No. 5-694.
As disclosed in JP-A-87-87 and JP-A-9-329114, there is a structure in which a through hole or a metal sleeve is provided in the FRP member itself to perform bolt joining. The bonding strength in these examples is mechanically dependent mainly on the surface pressure strength and bolt shear strength of the FRP member. Generally, FRP is an anisotropic material based on fiber orientation, and has very high tensile strength in the fiber orientation direction, but low compressive and shear strength. Therefore, in the above-mentioned joining method, the joining strength is governed by the compression and shear strength of the FRP and the shear strength of the bolt, and cannot support a large load.

As a method for solving this problem, Japanese Patent Laid-Open No.
No. 333807 discloses a method in which an FRP member is inserted into an opening and further provided on an FRP member into which a metal sleeve is inserted, and the shaft is passed through the metal sleeve after the member is inserted. This method has a structure in which the shearing force and bending moment generated at the joint portion are reduced. However, when a bending or tensile load is applied, in addition to a compressive force acting on the FRP layer at the opening, a shearing force at the metal sleeve embedded portion and a surface pressure on the FRP member may be generated. This results in that the stress concentration governs the bonding strength.

[0007] Further, in the case of pin connection or bolt fastening by providing a through hole in the FRP member, initial displacement and play are likely to occur. In strong joining, it is preferable to eliminate initial displacement and backlash and to avoid fastening by bolt bearing. For example, in Article 67 of the Building Ordinance of the Building Standard Act, the structural strength of a building exceeding 9 m in height or 13 m in span length. The use of bolted joints is not permitted in the upper major part.

Japanese Unexamined Patent Publication (Kokai) No. 6-26109 discloses a joining method in which the joining strength does not depend on the contact pressure strength and the shearing strength and the initial displacement and backlash do not occur. In this method, a belt-shaped FRP sheet is sandwiched between steel fittings, and a high-tensile bolt is tightened to a state close to a yield point to generate a strong frictional force, and joining is performed using the frictional force. This is called friction joining, and the joining strength is determined by the normal force generated by bolt tightening and the surface friction coefficient of the joining surface, and does not depend on the strength of structural members or bolts, so that strong joining can be obtained. However, the surface friction coefficient of the FRP material is essentially lower than that of a steel material that has been subjected to an appropriate surface treatment such as red rust or shot blast. According to the high-strength bolt design and construction guidelines that regulate the friction joining of steel structures, it is generally required that the surface friction coefficient of the joining surfaces be 0.45 or more. It is difficult to achieve with. Therefore, when the FRP material is directly friction-welded, the joint strength generated per unit area is small, and the joint area, the number of high-strength bolts, the weight of the joining member are increased, and the efficiency is poor.

Regarding the joining strength, when a metal structure represented by steel and an FRP are directly joined, a change in the rigidity of the joining portion due to a difference in rigidity between the FRP material and the metallic material itself and the presence of bolts, attachment plates, etc. As a result, a large load is applied to the joint portion and its peripheral portion, stress concentration occurs, and the strength of the joint portion and its surroundings tends to dominate the structural strength of the entire joint structure.

In addition, in the case of joining using an adhesive, since joining work for assembling a roof structure made of, for example, FRP is generally performed outdoors, it is often difficult to reliably carry out joining at that time.

When constructing a relatively large FRP roof structure, it is necessary to construct a frame first as described above and then form a roof with a relatively small roofing material. Therefore, there is a problem that a large roof structure such as a gymnasium requires a long construction period.

[0012] In addition, when the roof is re-laid due to aging of the existing roof such as a gymnasium, a temporary roof must be installed to protect the building itself from various weather conditions and the like. The installation of a temporary roof inside is a problem both technically and costly.

Furthermore, since the individual roofs have different lengths and sizes, there is a possibility that the sizes and the like do not match even if a large-sized roofing material is provided integrally. Especially if the length is too long,
It also affects the relative positional relationship with a gutter or the like, which is a problem.

[0014] The object of the present invention is to solve the above-mentioned problems.
F, which is a disadvantage in the joint structure in the above-described conventional technology,
The joining portion is configured to prevent surface pressure destruction of the RP member, and in order to further strengthen the joining of the FRP member, the joining of the FRP member through a joining member of a material different from the FRP material installed inside the FRP member. In addition to providing a joint structure made of FRP suitable for building members and the like so that joining is performed, attention can be paid to the problems of conventional relatively small roofing materials, construction can be performed in a short time, and cost reduction An object of the present invention is to provide a roof structure made of FRP which can be advantageously constructed and is suitable for construction of a large roof.

[0015]

Means for Solving the Problems In order to solve the above-mentioned problems, an FRP joining structure of the present invention has a structure in which a joining member made of a material different from the FRP material is provided inside a joining portion between FRP members. Wherein the FRP member is joined via the joining member.

In this FRP joining structure, the joining member may be exposed from the FRP member,
It may be embedded in the member, or may have at least a part integrally formed with the FRP member. The joining member is preferably made of a metal material. As the metal, for example, steel, aluminum alloy, copper alloy and the like can be used.

Further, the joining member may have a flat plate portion provided so as to be exposed and protruded from the FRP member.
Alternatively, a joining member separate from the FRP member and the joining member may be provided so as to be sandwiched, and a fastening member such as a bolt or a pin may be inserted into the joining member and joined by fastening.

For the flat plate portion, the plane of the flat plate is F
The RP member may be provided so as to be perpendicular or close to the upper and lower surfaces of the RP member and the joint end.

Further, as a shape of the joining member provided so as to be exposed from the FRP member, a shape member such as an H shape, an I shape, a groove shape, or a chevron may be used in addition to a flat plate.

The FRP joint structure of the present invention is characterized in that the joining members are entirely buried inside the FRP member.

In addition, the above-mentioned F
The RP member and the joining member are interposed with a separate joining member,
Each may be joined and integrated. The joining member is preferably made of a metal material. As metal, for example, steel,
Aluminum alloy, copper alloy, etc. can be used.

It is preferable that the buried portion provided in the FRP member of the joining member has a portion formed so as to follow the FRP layer of the FRP member. Further, it is more preferable that the thickness of the portion of the buried portion along the FRP layer is made thicker at the end than at other portions.

The FRP member may be a single FRP plate, but preferably has a sandwich structure in which FRP layers are provided on both sides of a core material.

Further, in order to secure the joining strength between the FRP member and the joining member, it is preferable that a box-shaped member made of FRP is provided inside the FRP member, and the joining member is joined to the box-shaped member. . An FRP roof structure can be configured using the FRP joining structure configured as described above.

[0025] The roof structure made of FRP according to the present invention comprises:
It is characterized in that two or more members are joined in the longitudinal direction.

In such an FRP roof structure, it is preferable that each FRP member before joining has a length of 4 to 20 m. By adopting such a length range, there is no problem in transportation, and a large roof can be efficiently formed at the construction site.

Further, a plurality of FRP roof structures in which two or more FRP members are joined in the longitudinal direction may be connected in the width direction.

[0028]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

As the matrix resin of the FRP member in the present invention, a thermosetting resin such as an epoxy resin, a phenol resin, an unsaturated polyester resin, a urethane resin, and a melamine resin is preferable. It has excellent flammability and is preferably used. In particular, when a phenol resin is used as a building member, excellent fire resistance can be obtained.

Glass fiber, aramid fiber, carbon fiber and the like are usually used as the reinforcing fiber of FRP. Carbon fiber is most preferred for obtaining a lightweight and high-strength FRP, but a glass fiber / carbon fiber hybrid is also preferred for balancing cost. As the form of the fiber used, cloth, mat, strand, and the like can be suitably used. Further, any kind of carbon fiber may be used in consideration of the high strength and rigidity of the carbon fiber. However, in view of lower cost, it is most preferable to use a so-called large tow carbon fiber.

For example, the number of filaments per carbon fiber yarn is not less than the usual number of 10,000, but
000 to 300,000, more preferably 5
The use of tow-like carbon fiber filament yarns in the range of 0000 to 150,000 yarns has better resin impregnation,
It is preferable because it is more excellent in handleability as a reinforcing fiber base material and further in economic efficiency of the reinforcing fiber base material. Also F
Placing a carbon fiber woven fabric on the surface of the RP structure enhances the design of the surface, which is more preferable. In addition, a reinforcing fiber base is formed by laminating a plurality of layers of reinforcing fibers as necessary or according to required mechanical properties and the like, and the reinforcing fiber base is impregnated with a resin. On the reinforcing fiber layer to be laminated, a fiber layer or a fabric layer aligned in one direction can be appropriately laminated, and the fiber orientation direction can be appropriately selected according to the direction of required strength.

In the case where the FRP member has a sandwich structure, for example, wood or foam can be used as the core material, but foam is preferable from the viewpoint of weight reduction. As the material of the foam, polyurethane, polystyrene, polyethylene, polypropylene, PVC, silicon, or the like is used, and its specific gravity is preferably selected from 0.02 to 0.2. For example, the material and specific gravity of the foam can be selected according to the required characteristics of the FRP roofing material, the type of resin used, and the like. If the specific gravity is less than 0.02, sufficient strength may not be obtained. On the other hand, when the specific gravity exceeds 0.2, the strength is increased, but the weight is increased, which is contrary to the purpose of reducing the weight.

FIG. 1 shows an FRP according to an embodiment of the present invention.
Fig. 2 shows a joint portion between FRP members of a joint structure made of steel.
In FIG. 1, 1a and 1b indicate FRP members,
In this embodiment, the FRP members 1a and 1b have a sandwich structure in which FRP layers 3a and 3b are arranged on both surfaces of the core material 2. A joining member 4a, 4 made of a material different from the FRP material is attached to the joining portion of these FRP members 1a, 1b.
b is integrally molded, and the two FRP members 1a and 1b are joined via the joining members 4a and 4b.

In this embodiment, the joining members 4a and 4b are made of a metal material.
It has flat plate portions 5a and 5b which are exposed to the outside of a and 1b and provided in a flange shape. These flat plate portions 5a, 5
b are integrally joined via bolts 6 and nuts 7 by fastening.

In this embodiment, the box-shaped members 8a and 8b are embedded at the respective joint ends of the FRP members 1a and 1b, and the legs 9a and 9b of the joint members 4a and 4b are connected to the box-shaped members 8a and 9b. 8b extends between the left and right side walls. Box-shaped member 8
Although the material of a and 8b is not particularly limited, in the present embodiment, it is composed of the same type of FRP as the FRP layers 3a and 3b, and the legs 9a and 9b of the joining members 4a and 4b are formed of FRP.
The box-shaped members 8a and 8b are joined to both side walls.

Further, in this embodiment, the cover members 10a and 10b are provided on both upper and lower surfaces of the FRP members 1a and 1b so as to cover the bolt fastening portions.
a and 10b are fixed to the FRP members 1a and 1b by screws 11.

In the joint structure made of FRP constructed as described above, the flat plate portions 5a and 5b of the joint members 4a and 4b made of a metal material as joint members made of a metal material can be joined together by fastening. It is not necessary to provide a through-hole or the like in the FRP members 1a and 1b when joining the 1RPs 1a and 1b, and the strength and rigidity of the FRP members 1a and 1b themselves are not reduced.

The joining members 4a and 4b serving as joint members
Are connected to the respective FRP members 1a, 1b via box-shaped members 8a, 8b, especially both side walls, and the FRP members 1a, 9b, 9c, 9b of the joining members 4a, 4b.
1b, the force is transmitted over a wide range via the box-shaped members 8a and 8b.
Even when a tensile force or a compressive force is applied to the P members 1a and 1b, the force can be dispersed throughout the FRP members 1a and 1b, and the occurrence of partial stress concentration can be reduced.

As a result, a sufficient strength can be ensured at the joining portion, and the FRP members 1a and 1b are joined very firmly and integrally. Further, since the joining is performed by fastening with bolts and nuts, there is no uncertainty as in the case of bonding. In addition, if a plurality of FRP members are connected by the above-described joints, a large-sized building member such as a roof member can be manufactured very easily and integrally.

FIG. 2 shows an FR according to another embodiment of the present invention.
3 shows a joint between FRP members of a joint structure made of P; In the present embodiment, the FRP members 21a, 21b
The FRP layers 23 on both sides of the core material 22
a and 23b having a sandwich structure in which both F
A box-shaped member 24 is provided inside the joint ends of the RP members 21a and 21b.
a and 24b are buried.

Joining members 25a, 25b as joint members
Is a flat plate portion 2 extending in a web shape, which is completely buried inside the FRP members 21a and 21b having a sandwich structure.
6a, 26b and legs 27a extending between the side walls of the box-shaped members 24a, 24b and integrally joined to the side walls;
27b. These joining members 25a, 25b
The two FRP members 21 are inserted through the through bolts 28 and the nuts 29 so as to sandwich the flat plate portions 26a and 26b from both sides.
The ends of a and 21b are joined. The cover members 30a and 30b are provided with screws 31 on the upper and lower surfaces of the joint.
Has been fixed by.

In such a joint structure made of FRP, a hole penetrating through each FRP member 21a, 21b in the thickness direction is unnecessary, and a decrease in the strength of the FRP members 21a, 21b themselves is prevented. In addition, each FRP member 21a, 21b
Since the joining is performed through the joining members 25a and 25b extending into the inside, the stress concentration at the joining portion is also relieved particularly through the box-shaped members 24a and 24b, and extremely strong joining is achieved. .

FIG. 3 shows a joint between FRP members of a joint structure made of FRP according to still another embodiment of the present invention. In this embodiment, the FRP members 41a, 4a
1b has a sandwich structure in which FRP layers 43a and 43b are arranged on both surfaces of a core material 42, and both FRP members 41
Box-shaped members 44a, 44b are buried inside the joint ends of a, 41b.

Joining members 45a and 45b as joint members
Is an F which faces from ends of the FRP members 41a and 41b.
A flat plate portion 46a protruding toward the end of the RP member,
46b and legs 47a, 47b extending between both side walls of the box-shaped members 44a, 44b and integrally joined to the both side walls.
And The flat plate portions 46a, 46b of the joining members 45a, 45b are joined to the FRP members and the joining members 48a, 4
8b, the bolt 49 and the nut 50 fasten and join. Then, the FRP member 41 at the joint portion
Cover members 51a and 51b are fixed to the upper and lower surfaces of a and 41b by screws 52.

Also in such a joint structure made of FRP, it is unnecessary to provide a through hole in each of the FRP members 41a and 41b, and the strength of the FRP members 41a and 41b is prevented from being reduced. In addition, since the joining is performed via the joining members 45a and 45b, and further via the box-shaped members 44a and 44b, occurrence of inconvenience such as stress concentration at the joining portion is reduced, and extremely strong joining is achieved. You.

FIGS. 4 and 5 show a joint portion between FRP members of an FRP joint structure according to still another embodiment of the present invention. In the present embodiment, the FRP members 61a and 61b are provided on both surfaces of the core material 62 by FRP layers 63a and 61b.
63b has a sandwich structure in which both FRPs
At the joining end portions of the members 61a and 61b, a sandwich structure portion including the core material 64 and the FRP layers 65a and 65b is formed on the upper and lower surfaces and partially in the width direction of the FRP members 61a and 61b. ing. Bolt 66, nut 6
As shown in FIG. 5, the core 64
Is not provided, and this portion is formed in a hollow shape. Bonding members 68a, 68b, 68c, and 68d each having an L-shaped cross section are embedded in a flange shape on the upper and lower surfaces of the bonding ends of the FRP members 61a and 61b, respectively.
Plate portions 69a, 69b, and joining members 68c, 68
d flat plate portions 69c and 69d
6. Fastened and joined by a nut 67.

Also in such an FRP joint structure, it is not necessary to provide a through hole in each of the FRP members 61a and 61b, and a decrease in the strength of the FRP members 61a and 61b itself is prevented. Also, the joining members 68a, 68b, 68c, 6
8d, and each joining member is buried in the FRP members 61a, 61b over a wide range. Therefore, occurrence of inconvenience such as stress concentration in joining is reduced, and extremely strong joining is achieved. .

FIGS. 6 and 7 show a joint between FRP members of an FRP joint structure according to still another embodiment of the present invention. In the present embodiment, the FRP members 101a and 101b
03a and 103b are arranged in a sandwich structure, and FR portions are provided inside the ends of both FRP members 101a and 101b.
Joining members 105a, 105 made of a material different from the P material
b are buried integrally, and the joining members 105a, 105
FIG. 8 shows a perspective view of 5b.

The FRP member 1 is further covered so as to cover the joint.
01a and 101b, cover members 111a and 1
11b, and cover portions 111a, 111b
Are fixed to the FRP members 101a and 101b by screws 112.

The joining members 105a and 105b for joining the FRP members 101a and 101b are made of steel, and the FRP member 10 for fastening the FRP members 101a and 101b to each other.
1a, 101b Flat plate portion 1 protruding outside
07a and 107b and buried portions 106a and 106b installed inside the FRP members 101a and 101b and serving to transmit stress to the FRP layers 103a and 103b. The embedding portions 106a and 106b of the present embodiment have a hollow structure, but may have a solid structure or may be filled with a foam, for example.

The flat plate portions 107a, 107b
13a, 113b and the FRP layers 103a, 103b. As a result, the FRP layers 103a, 103b, and the FRP layer end face 1 are prevented from being disturbed by the flat plate portions 107a, 107b.
14a, 114b are continuously connected on the upper surface, the end surface, and the lower surface, and a strong joint portion is established.

In this embodiment, the FRP is formed using a flat plate.
Although the members are joined together, the joints may be formed into a) H-shaped, a) I-shaped, c) grooved, and d) chevron shaped members 115a and 115b as shown in FIG. Although not shown, the profiles 115a and 115b are joined to each other by a separate joining member. In this case, the fiber is on the top,
Although there are many places where the continuity leading to the end face and the lower face is hindered, it is easy to obtain high bending rigidity and light weight of the joint portion. Therefore, when high bending stiffness is required at the joint, it is possible to satisfy the requirement with a small number of joints by using the above-mentioned profile, and as a result, the influence on the continuity of the FRP layer In some cases. Therefore, for the configuration of these joints, the best shape may be selected from a flat plate or a shape material in consideration of required conditions such as rigidity and strength.

Further, in this embodiment, the embedded portions 106a, 1
06b and the core material 102 between the FRP layers 104a, 104
b is provided. Thus, the buried portions 106a, 106b
FRP layer 104 on the opposite end surfaces 113a and 113b of
By providing a and 104b, the compressive rigidity and compressive strength of the joint in the joining direction can be improved.

The method of arranging the FRP layer around the buried portions 106a and 106b may be set arbitrarily according to the respective joining conditions. However, by arranging the FRP layer all around the buried portion as in this embodiment, Torsion, bending, compression,
Bonding strength under various load conditions such as tension can be efficiently obtained.

The joining between the FRP members 101a and 101b is performed by the flat plate portions 107a and 10b of the joining members 105a and 105b.
7b. In the present embodiment, a joining member 108 separate from the FRP members 101a, 101b and the joining members 105a, 105b is provided at a joint between the FRP members.
, And each is fastened by a bolt 109 and a nut 110 to be integrated. Alternatively, a pin, a rivet, welding, or the like generally used for a mechanical structure may be used. In addition, the flat plate portion 107 is not interposed via a separate joining member 108.
a and 107b may be joined so as to overlap each other.

By making these conventionally used fastening methods applicable to the joining of FRP members, the joining strength,
A joining method excellent in workability and reliability can be realized.

This embodiment is characterized in that the joining members 105a,
105b plays the role of joining members together
7a and 107b and buried portions 106a and 106b which are integrally molded in the FRP member and play a role of transmitting stress between the FRP member and the joining member. This is because it is better to use an isotropic and highly rigid metal material for the joint portion for performing bolting or the like than to use an anisotropic FRP member. The drawback of using a metal material is stress concentration due to the difference in rigidity between the joining member made of a metal material and the FRP member, but for this, the portion of the metal material embedded inside is integrated with the FRP member. It can be eased by molding and designing the shape of the portion to be embedded to transmit stress efficiently. Therefore, the above-mentioned metal material is composed of a joint portion and a stress transmission portion, and by separating these two functions, the metal material and the FR are separated.
Lightweight and strong, taking advantage of both characteristics of P material, further workability,
A reliable joint structure is established.

Further, in the joined body having the sandwich structure, the FRP layer on the surface responsible for strength and the core material having generally low strength are divided, and since reliable stress transmission to the FRP layer is required, these joining methods are preferable. is there.

Further, in the present embodiment, joining can be performed according to the friction joining method indicated in the guideline for designing and constructing high-strength bolts. Friction welding is a joining method widely applied to joining of a general steel building, and the flat plate portion 1 of the present embodiment is used.
By performing the friction joining method in accordance with the above-mentioned construction guidelines in 07a and 107b, joining by bolt bearing pressure is avoided, and F
In the case of joining the RP members, the same joining as that of the steel structure can be applied. For example, if the following friction joining method indicated in the high-strength bolt design and construction guideline is applied to a blank FRP member having a tensile strength of 70 t without using the joint of the present embodiment under the following conditions, slippage of the joint occurs up to a tensile load of 90 t. A strong bond is obtained.

1. High strength bolts are M12 bolts (F10
T) and 18 nuts (F10) are used for each member.

[0061] 2. For the high-strength bolt tightening, a predetermined torque management method or a nut rotation method is used.

Alternatively, a torcia-type high-strength bolt is used.

3. The joining members 108 that are separate from the flat plate portions 107a and 107b are made of steel, and are subjected to shot blasting after black scale removal to ensure a surface friction coefficient of 0.45 or more.

4. The dimensions of the flat plate portions 107a and 107b shown in the perspective view of the joining member in FIG.

[0065]

[Table 1]

FIG. 10 shows a joint between FRP members of an FRP joint structure according to still another embodiment of the present invention. In the present embodiment, the FRP member 121a,
121b has FRP layers 123a, 1
23B has a sandwich structure in which both FRPs are arranged.
Joining members 125a and 125b made of a material different from the FRP material are embedded inside the joining ends of the members 121a and 121b. Similar to the embodiment shown in FIG. 6, the joining was performed by friction joining using the flat plate portions 127a and 127b and the joining member 128 separate from the FRP member and the joining member.

Further, the FRP member 1 is
Cover members 131a, 1
The FRP member 13 is provided with a screw 132.
1a and 131b.

The difference from the embodiment shown in FIG. 6 lies in the cross-sectional shape of the buried portions 126a and 126b.
FIG. 11 is a perspective view of 5a and 125b. Depending on the application of the joint, stress concentration at four corners of the buried portions 126a and 126b in FIG. 6 may become a problem. In such a case, a method of diversifying the cross-sectional shape or increasing the diameter of the corner curvature may be used. For example, as in the present embodiment, the cross-sections of the buried portions 126a and 126b are mainly formed in an arc shape. It may be shaped. In this embodiment, the FRP layer 1
21a, 121b, 123a, 123b, 124a, 1
24b draws a gentle curved surface and is continuously connected to the upper surface, the end surface, and the lower surface.
Stress concentration around 126b can be greatly reduced. The cross-sectional shapes of the buried portions 126a and 126b may be U-shaped (A) as shown in FIG.
Hexagons (f), semicircles (h), semi-ellipses (h) and the like can be considered.

In addition, the portions along the upper and lower surfaces of the FRP layer of the buried portion, such as a, c, d, and e in FIG. If the thickness is increased so that the rigidity is high at the joint end and gradually changes to approach the rigidity of the case of only the FRP member, a strong joint in which stress concentration hardly occurs can be obtained. .

As described above, the sectional shape of the buried portion, FR
Various conditions are conceivable for the shape of the portion exposed from the P member, the arrangement of the FRP layer, and the like. However, the strength, rigidity, weight, and manufacturability required for each stress state according to each bonding state The optimum design may be performed in consideration of the cost, cost, and the like.

FIG. 13 shows a joint between FRP members of another joint structure made of FRP according to an embodiment of the present invention. In FIG. 13, reference numerals 81a and 81b denote FRs.
The P member is shown, and in this embodiment, the FRP member 81
a, 81b are FRP layers 83a, 83
b has a sandwich structure in which they are arranged. Joining members 88a and 88b having a U-shaped cross section are embedded inside the joining portions of the FRP members 81a and 81b.
Each FRP member 81 is attached to each joint end of the members 81a and 81b.
a, 81b and a joining member 84 separate from the joining members 88a, 88b are provided.
The RP members 81a and 81b are joined.

The separate joining member 84 is made of a metal material in this embodiment, and a perspective view is shown in FIG. The separate joining member 84 has flat plate portions 85a and 85b. Nuts 87 are fixed to end surfaces of the joining members 88a and 88b, and these flat plate portions 85a and 85b and the FRP member 81 are fixed.
The end portions a and 81b are integrally joined by bolts 86 and nuts 87 by fastening.

In the FRP joint structure constructed as described above, it is not necessary to provide holes penetrating in the thickness direction in each of the FRP members 81a and 81b.
1b itself is prevented from decreasing in strength. Also, the joining member 88
a, 88b and a separate joining member 84, and the joining members 88a, 88b
Since it is buried in the RP members 81a and 81b, the occurrence of inconvenience such as stress concentration in the joining is alleviated, and extremely strong joining is achieved.

An FRP in which two or more FRP members are integrally joined by the joining according to each embodiment as described above.
Integrated FR structure
The joint structure made of P can exhibit excellent strength and rigidity throughout. Such an FRP joint structure is particularly suitable for a large building member, for example, a large FRP roof structure.

FIG. 15 shows an FR according to an embodiment of the present invention.
The roof structure made from P is shown. In FIG. 15, reference numeral 71 denotes an entire FRP roof structure.
In the longitudinal direction, the roof structure 71 made of
2 (in this embodiment, two places). The dividing portion 72 is formed by, for example, a joining portion in the joining structure made of FRP as described above. Each of the FRP members 73a, 73b, 73c before the integrated joining has the sandwich structure as described above, and the FRP roof structure as an integrated product by joining two or more FRP members in the longitudinal direction. 71 are configured. Each FRP member 73a, 73b, 73c is 4 to 20 m
It has a length in the range, and is easy to handle from both sides of transportation and on-site joining.

The joining members as described above are used for joining the FRP members to each other, and the joining portion has an extremely strong integrated structure.

In such a roof structure 71 made of FRP, each FRP member has high strength and high rigidity while being lightweight by a sandwich structure, and the roof structure 71 made of FRP to which each FRP member is joined. Has extremely high strength and high stiffness characteristics as a whole, so the frame required in the past can be eliminated or minimized, and the construction period when re-roofing the roof can be shortened, and costs are reduced. Can be reduced.

Further, since the length of each FRP member is also set in the range of 4 to 20 m, the transportation is easy, and the required length at the construction site can be easily obtained by joining via the joining member as described above. FRP roof structure. Therefore, simplification of construction and cost reduction are also achieved. In addition, it is possible to freely adapt to the size of the roof, and a large-sized roof material can be easily configured. Furthermore, the structure of the joining member and the joining portion, for example, FIGS.
Depending on which of the structures shown in FIG. 4 is selected, it is possible to deal with various buildings. Further, by providing the cover member as described above at the joint, it is possible to completely seal rainwater and the like.

The FRP roof structure 71 as described above is
For example, as shown in FIG. 16 and FIG. 17, a plurality can be connected in the width direction. FIG. 16 shows a case where two pieces are connected, and FIG. 17 shows a case where many pieces are connected.
The connecting method may be by adhesion, a joint structure similar to that shown in FIGS. 1 to 14 or a lap joint structure similar to the conventional one. By such connection in the width direction, a desired large-sized roofing material can be configured extremely efficiently.

[0080]

As described above, according to the joint structure made of FRP of the present invention, an extremely high strength and rigid joint structure made of FRP in which FRP members are integrally joined can be achieved. An FRP structure suitable for a member or the like can be provided at low cost.

Further, according to the FRP roof structure of the present invention, it is relatively short when transported, but it can be easily formed on site at a long FRP roof structure. It is possible to provide a simple FRP roof structure.
In addition, since the size and the like can be set substantially freely according to each roof, the construction can be facilitated and the overall construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a joint portion of an FRP joint structure according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a joint portion of an FRP joint structure according to another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a joint portion of an FRP joint structure according to still another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a joint portion of an FRP joint structure according to still another embodiment of the present invention.

FIG. 5 is a partial plan view of the joining structure made of FRP in FIG. 4;

FIG. 6 is a longitudinal sectional view of a joint portion of an FRP joint structure according to still another embodiment of the present invention.

FIG. 7 is a partial plan view of the joining structure made of FRP in FIG. 6;

FIG. 8 is a perspective view of a joining member used in the FRP joining structure of FIG. 6;

FIG. 9 is a perspective view of a bonding mode according to the embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a joint portion of an FRP joint structure according to still another embodiment of the present invention.

FIG. 11 is a perspective view of a joining member used in the FRP joining structure of FIG. 9;

FIG. 12 is a sectional view of an example of a joining member according to the embodiment of the present invention.

FIG. 13 is a longitudinal sectional view of a joint portion of an FRP joint structure according to still another embodiment of the present invention.

FIG. 14 is a perspective view of a joining member used in the FRP joining structure shown in FIG. 12;

FIG. 15 is a schematic plan view of an FRP roof structure according to an embodiment of the present invention.

FIG. 16 is a schematic plan view of an FRP roof structure according to another embodiment of the present invention.

FIG. 17 is a schematic plan view of an FRP roof structure according to still another embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 21a, 21b, 41a, 41b, 61
a, 61b, 81a, 81b, 101a, 101b, 1
21a, 121b ... FRP member 2, 22, 42, 62, 82, 102, 122 ...
Core material 3a, 3b, 23a, 23b, 43a, 43b, 63
a, 63b, 83a, 83b, 103a, 103b, 1
04a, 104b, 123a, 123b, 124a,
124b,... FRP layer 4a, 4b, 25a, 25b, 45a, 45b, 68
a, 68b, 68c, 68d, 105a, 105b, 1
25a, 125b ... joining members 48a, 48b, 84, 108, 138 ... separate joining members 5a, 5b, 26a, 26b, 46a, 46b, 69
a, 69b, 69c, 69d, 85a, 85b, 88
a, 88b, 107a, 107b, 127a, 127b
... Flat plate portions 6, 28, 49, 66, 86, 109, 129
Bolts 7, 29, 50, 67, 87, 110 ... Nuts 8a, 8b, 24a, 24b, 44a, 44b ...
Box-shaped member 9a, 9b, 27a, 27b, 47a, 47b ...
Legs 10a, 10b, 30a, 30b, 51a, 51b, 1
11a, 111b, 131a, 131b ··· cover member 11, 31, 52, 112, 132 ··· screw 64 ··· core material 65a and 65b ··· FRP layer 71 ··· FRP roof structure 72 · .. Dividing parts 73a, 73b, 73c ... FRP members 106a, 106b, 126a, 126b ... Embedding parts 113a, 113b ... Joining end faces 114a, 114b ... FRP layer end faces 115a, 115b ... Lumber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04D 3/368 E04C 2/50 R // B29K 67:00

Claims (20)

[Claims] An FRP member is provided inside a joint portion between the FRP members.
A joint structure made of FRP, wherein a joint member made of a material different from the material is installed, wherein the FRP member is joined via the joint member. 2. The FRP joint structure according to claim 1, wherein the joint member has at least a portion integrally molded inside the FRP member. 3. The FRP joint structure according to claim 1, wherein a part of the joint member is exposed outside the FRP member. 4. The FRP according to claim 3, wherein the exposed joining member has a flat plate portion, and the flat plate portions are joined together to join the FRP members together.
Joining structure made of RP. 5. The FRP according to claim 4, wherein the surface of the flat plate portion is provided so as to protrude at an angle perpendicular to or close to the upper and lower surfaces and the end surface of the FRP member.
Joint structure. 6. The FRP according to claim 4, wherein the flat plate portions are overlapped and joined.
Joint structure. 7. An exposed portion of the joining member is H-shaped,
The FRP joint structure according to claim 3, wherein the joint structure is a shape having a shape of a groove, a groove, or a chevron. 8. The FRP member according to claim 1, wherein:
The joining structure made of FRP according to any one of claims 3 to 5 or 7, wherein a joining member separate from the member and the joining member is interposed, and each is joined and integrated. 9. The FRP joint structure according to claim 3, wherein the members are fastened and joined by using a high-strength bolt tightened with a force close to the yield stress. 10. The FRP joining structure according to claim 1, wherein the joining members are all buried inside the FRP member. 11. The method according to claim 11, further comprising:
The joining structure made of FRP according to claim 10, wherein a joining member separate from the P member and the joining member is interposed, and each is joined and integrated. 12. The F according to claim 1, wherein the buried portion of the joining member provided inside the FRP member has a portion formed so as to follow the FRP layer.
Joining structure made of RP. 13. The F according to claim 12, wherein the thickness of the buried portion at the end of the FRP member is greater than that of the other portion.
Joining structure made of RP. 14. The FRP joint structure according to claim 1, wherein the joint member is made of a metal material. 15. The FRP joint structure according to claim 1, wherein the FRP member has a sandwich structure in which FRP layers are provided on both surfaces of a core material. 16. The FRP joining structure according to claim 1, wherein an FRP box-shaped member is provided inside the FRP member, and the joining member is joined to the box-shaped member. body. 17. The FR according to claim 1,
An FRP roof structure having a P joint structure. 18. The FPR roof structure according to claim 17, wherein two or more FRP members are joined in the longitudinal direction. 19. The FRP roof structure according to claim 17, wherein each of the FRP members has a length of 4 to 20 m. 20. The FRP product according to claim 18, wherein a plurality of FRP roof structures in which two or more FRP members are joined in the longitudinal direction are connected in the width direction. Roof structure.