JPH09329114A - Connection structure for pipe body made of fiber reinforced synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a connected part was extremely tragile since a conventional connecting method of a pipe body made of fiber reinforced synthetic resin mainly depended on binding with wires. SOLUTION: There is provided a connecting fitting 14 consistent with the square hole shape to be fitted to an end of a pipe body 10 made of fiber reinforced synthetic resin with a hollow inside space in the square hole shape and provided with a plurality of nuts conforming to a bolt through hole 12 opened on the end outer circumference of the pipe body 10. And when at least one end of the pipe bodies 10 is connected to a linear state, L-shaped, T-shaped or other cubic shapes, a bolt 20 is screwed to a nut of the connecting fitting 14 through the bolt through hole so that both the pipe bodies are rigidly connected to each other with the bolt 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for fiber-reinforced synthetic resin pipes.

[0002]

2. Description of the Related Art The applicant of the present invention has previously described the above-mentioned unsaturated polyester resin which covers an intermediate layer in which reinforcing fibers are integrally bound with an unsaturated polyester resin, and an inner peripheral surface and an outer peripheral surface of the intermediate layer. We have developed a square-hole-shaped fiber-reinforced synthetic resin tubular body with a three-layer structure having an inner layer and an outer layer made of a thermoplastic resin having a chemical affinity for.

[0003] Such a tube body is essentially light in weight peculiar to an FRP pole and has a high degree of elasticity and rigidity, and at the same time, the inside and outside are covered with a thermoplastic resin layer to expose the fibers. Since it is possible to prevent hand scratches due to various factors such as scaffolding, skeleton frames for structures such as shipping containers, frames for goal nets used in ball games, etc., their applications are expanding as various lightweight frame materials. .

By the way, since the above-mentioned pipes are originally shipped from the continuous drawing material of the fiber reinforced resin after being cut into the lengths of the standard lengths, the connecting structure between these pipes is described. Was not specifically considered.

Therefore, for example, in order to join the pipes to each other at an assembly site, conventionally, as shown in FIG. 9, the end portions of the pipes 1 are superposed on each other at a predetermined overlap at the assembly site, a wire, etc. No. 2 wire is wrapped around both to join,
Alternatively, as shown in FIG. 10, the end faces of the tubular body 1 are butted against each other, and the application plate 3 is applied to the upper and lower sides of the tubular body 1 so as to straddle the two tubular bodies 1, and the outer circumference thereof is tightly bound with the number 2 or the like. I was going.

[0006]

Therefore, even if the tube itself is made of a high-strength material, the strength of the joint portion is significantly weak and the appearance is not smart. Further, when the connection method as shown in FIG. 9 is performed, the overall length is shortened by the overlap margin, and the number of used pieces is increased to waste a material in order to secure a necessary fixed length. At the same time, it has a drawback that the material cost becomes high.

Further, there has been a demand for a connecting structure which can easily and surely perform complicated coupling such as T-shaped, L-shaped or three-dimensional assembly.

The present invention has been made in order to solve the above problems, and the connection strength between the pipes can be made high and surely, and the overlapping portion of the connection portion is unnecessary. As a result,
(EN) Provided is a connection structure of a fiber-reinforced synthetic resin tube body, which is capable of suppressing waste of material and reducing material cost, is smart in appearance, and can also cope with a complicated connection shape.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is fitted to the end portion of an internally hollow fiber-reinforced synthetic resin tubular body having a square hole shape. At the same time, at least one end portion of the pipes is linearly provided with a coupling fitting that matches the shape of the square hole provided with a plurality of screw holes corresponding to the bolt through holes opened on the outer periphery of the end of the pipe. -Shaped, L-shaped, T-shaped, or other three-dimensional shapes are joined together, the bolts are screwed into the screw holes of the fitting through the bolt through holes to rigidly join the two tubular bodies together with the bolts. It is characterized by doing so.
The coupling fitting referred to in the present invention is not necessarily made of metal, and may have a structure in which a nut is insert-molded in plastic or the like.

With the above arrangement, the present invention is
The joint fitting itself is rigidly coupled to the pipe body through the bolts and at the same time is firmly coupled to the counterpart side by the bolts inserted from the counterpart side, without providing an overlapping margin at the connecting portion.

In the invention according to claim 2 of the present invention, in the invention according to claim 1, the coupling metal fitting is a rectangular end face plate fitted to the end face of the tubular body, and four end faces of the end face plate. It is composed of four elastic fitting pieces that are bent and extend rearward, and nut portions are formed on each of the end face plate and the fitting piece.

Therefore, with this structure, the structure of the fitting itself can be simplified, and the fitting does not move in the state of being fitted in the tubular body, and the position of the fitting itself is internally fixed by screwing. Be corrected.

In the invention according to claim 3 of the present invention, a collar having a shape corresponding to the connecting shape is fitted to the outer periphery of the connecting portion of the pipe body, and the collar and the outer periphery of the pipe body are fitted to the collar. Since the bolt is screwed into the screw hole of the coupling fitting through the formed bolt through hole, the connecting portion can be reinforced and at the same time the joint end of the end portions of the pipe body can be seen from the outside. It is possible to obtain a smart and design connection shape.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a connection structure in which the present invention is applied to a linear connection form. In the drawings, bolt through holes 12 are opened on both sides of the joint end of the hollow fiber-reinforced synthetic resin pipes 10 having a square hole shape.
The joint fittings 14 are fitted and fixed to the joint end opening surfaces.

Each of the illustrated joining fittings 14 is made of a metal press-molded body such as a steel plate, and as shown in FIGS. 1 and 2, the dimensions and shape corresponding to the opening surface shape of the tubular body 10. And the rectangular end face plate 14a and the end face plate 1
The end face plate 14a is composed of four elastic fitting pieces 14b which are bent and extend rearward from the four circumferences of 4a.
Also, bolt insertion holes 14c are opened at the centers of the elastic fitting pieces 14b on both sides, and a nut 16 is integrally fixed by welding 18 to the inside thereof. The fiber-reinforced synthetic resin pipe body 10 has an outer diameter of, for example, 50 m.
m, the inner diameter is 40.5 mm, and the thickness is 4.75 mm. Further, as the nut 16, for example, an M6 nut is used.

Further, as shown in FIG. 1, the tip end of each elastic fitting piece 14b is slightly bent inward so that it serves as a fitting guide for the pipe body 10,
It is possible to deal with the inner dimensional error of.

It is needless to say that the joining metal fitting 14 can be constituted not only by the press-molded body as described above, but also by, for example, a threaded aluminum die-cast product or a synthetic resin molded body in which a nut is insert-molded. Is.

The joint fittings 14 are connected to the pipes 1 respectively.
0 is press-fitted into the open end face, and the metal fitting 1 is inserted into the bolt through hole 12.
After aligning the bolt through holes 14c on the 4 side,
Insert 0 into the bolt through hole and screw it in to bolt 2
The tip of 0 is screwed into the welding nut 16, and the joint fitting 14 is firmly fixed to the joint end surface of each pipe 10. Joining metal 14
For example, the width is 39.5 mm and the length is 40 mm.

Further, the end plates 14a are used to join the tubes 10 together.
Both side bolts 22 are screwed into the respective welding nuts 16 through the bolt through holes 14c of
Connect 0s in a straight line.

In addition, first, in the state where the joint fittings 14, 14 are connected to each other through the bolts 22 on both sides, each of them is connected to the pipe body 10.
It is also possible to fit it in and then fix it with bolts 20.

3 to 5 show another connection structure having a linear connection form. In each connection structure, the bolt through holes 12 are opened above and below the end portion of the tubular body 10, and correspondingly, the upper and lower elastic fitting pieces of the joint fitting 14 are also provided with the bolt through holes, and A welding nut is provided (both not shown).

First, in FIG. 3, a collar 24 in the shape of a rectangular sleeve is provided on the outer periphery of the joint ends of both pipe bodies 10 so as to straddle them.
Are fitted. A bolt through hole 26 is also formed at a position corresponding to each bolt through hole 12 of the collar 24. Both pipe bodies 10 with the fittings 14 fitted therein are inserted into the collar 24, and the bolt through hole is formed. 1
After matching 2, 26, bolt 2 from the outer peripheral side.
By inserting 0 and screwing them together, both pipes 10 are linearly connected via the collar 24.

In this connection structure as well, similarly to the above, it is also possible to first fit the fittings 14 to each other with the bolts 22 on both sides, and then fit the fittings 14 into the tubular body 10. Nor.

In FIG. 4, a collar 28 having a U-shaped cross section is fitted over the outer periphery of the joint ends of both pipes 10 so as to extend over the both. Bolt through holes 30 are similarly formed on the upper surface and both side surfaces of the collar 28 at positions corresponding to the bolt through holes 12, and the collar 28 is fitted from the upper side in a state where both pipe bodies 10 are joined. Then, the bolts 20 are screwed into each other through the bolt through holes 30 to connect the two pipe bodies 10 to each other.

Incidentally, in this connection structure, similarly to the above, in advance, the fittings 14 are connected to each other through the bolts 22 on both sides, and are fitted into the pipe body 10, and then only the lower side is fixed by the bolts 20. Then, the collar 28 can be fitted and bolted. Also,
By arranging the connection plate on the lower surface side and bolting the connection plate, a connection shape similar to that of the sleeve collar can be finally obtained.

In FIG. 5, a pair of collars 32 having an L-shaped cross section are fitted to the outer circumferences of the joint ends of the two pipe bodies 10 so as to straddle them. Bolt through holes 34 are similarly formed on the upper surface and the side surface of each collar 32 at positions corresponding to the bolt through holes 12. The collars 32 are applied in a state in which both pipes 10 are joined to each other, and the bolt through holes are inserted. By screwing the bolt 20 through the hole 34, both pipes 1
It is designed to connect 0s. Even in this case, finally, the connection form is the same as that of the sleeve collar. If the connection strength is not so required, the number of connecting steps can be reduced by adopting a mode in which only the collar 32 on one side is joined.

Although not shown in the figure, the collars may be replaced by plates attached to the respective surfaces.

Next, FIG. 6 shows a case where the present invention is applied to a T-shaped connection form. As shown on the left side of the drawing, when joining the stud B to the middle position of the frame A,
First, as partially enlarged on the right side of the drawing, the joining metal fitting 14 is press-fitted into the joining end surface of the tubular body 10 to be the studs B and fastened with the bolt 20, while the tubular body 10 constituting the frame A is A T-shaped connection is made possible by forming a bolt through hole 36 at the mounting position, inserting a long bolt 38 into this, and screwing it into the welding nut 16 on the end face of the joining metal fitting 14.

Next, FIG. 7 shows a case where the present invention is applied to a three-dimensional L-shaped joint form at a corner portion of a three-dimensional box frame C.

As shown on the left side of the drawing, the corner portion of the box frame C is a portion where three pipes are joined in the vertical and horizontal directions and the height direction. In such a case, first of all, in the case of FIG. As shown partially enlarged on the right side, a pair of horizontally intersecting pipes 1
No. 0 joint end face is press-fitted with the joint fitting 14, and the bolt 20
The large through hole 4 for inserting the bolt 20 and the wrench into the mounting position of the tubular body 10 forming the pillar
By forming an opening 0, inserting a normal bolt 20 into the opening 0, and screwing it into the welding nut 16 on the end surface of the joining metal fitting 14, an L-shaped three-dimensional connection becomes possible. Needless to say, the surface of the tubular body 10 that constitutes the pillar facing the joint fitting 14 is formed as a bolt through hole 12 having a normal diameter.

Further, in the figure, a hexagonal bolt type bolt 20
However, various types of bolts such as a hexagon socket head cap screw and a round flat head screw can be used.

FIG. 8 shows a case in which a collar is used in the T-shaped joint form. In the figure, a collar 42 is a horizontal sleeve 44 that passes through the ends of a pair of horizontally connected pipes, a vertical sleeve 46 that rises up integrally as a convex shape in the center of the horizontal sleeve 44, and sleeves 44, 46. Each surface is provided with a plurality of bolt through holes 48 opened at positions corresponding to the bolt through holes 12 of the pipe body 10.

The pair of pipes 10 fitted in the horizontal sleeve 44 are provided with connecting fittings having the same shapes as those in the above-mentioned embodiments. On the other hand, the tubular body 10 fitted in the vertical sleeve 46 is also vertically passed through the horizontal sleeve 44, so that the hole position of the bolt through hole 12 is opened at a position retracted from the horizontal tubular body 10. Accordingly, the length of the elastic fitting piece 14 in the joint fitting 14 is extended, and the hole position and the welding nut position are also different.

It is needless to say that not only a collar having a shape corresponding to the illustrated T-shaped connection configuration but also an L-shaped collar, a cross-shaped collar, and a collar in which each sleeve extends three-dimensionally can be made according to the joining configuration. Is.

[0036]

As is apparent from the above description, in the connecting structure of the fiber-reinforced synthetic resin pipe body according to the first aspect of the present invention, the connecting metal fitting itself is rigidly connected to the pipe body through the bolt and at the same time. Since the bolts inserted from the side firmly connect to the other side, there is an advantage that the connection is strong. Moreover, the overlapping portion of the connecting portion is not required, and as a result, the waste of material can be suppressed, the material cost can be reduced, and the appearance is smart.

Further, by adopting the constitution of claim 2 of the present invention, the constitution of the coupling fitting itself can be simplified, it does not move in the state of being fitted in the pipe body, and moreover, the coupling fitting itself is screwed. Since the position is corrected internally, the assembly work is easy.

Further, by adopting the constitution of claim 3 of the present invention, the connection portion can be reinforced, and at the same time, the joint ends of the end portions of the pipe body cannot be seen from the outside, and It has the advantages of good-looking, smart and design-like connection.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a case where a connection structure of the present invention is applied to a linear connection form.

FIG. 2 is a partial side view and front view of a joint fitting used in the same connection structure.

FIG. 3 is an exploded perspective view showing a case where a sleeve collar is used in the same linear connection form.

FIG. 4 is an exploded perspective view showing a case where the same U-shaped collar is used.

FIG. 5 is an exploded perspective view showing a case where the same L-shaped collar is used.

FIG. 6 is an explanatory diagram when the connection structure of the present invention is applied to a T-shaped connection form.

FIG. 7 is an explanatory diagram when the connection structure of the present invention is applied to an L-shaped connection form.

FIG. 8 is an exploded perspective view showing a case where a collar is used in the L-shaped connection form.

FIG. 9 is a perspective view showing an example of a conventional connection form between tubular bodies.

FIG. 10 is a perspective view showing another example of a conventional connection form between tubular bodies.

[Explanation of symbols]

 10 Rectangular hollow fiber reinforced synthetic resin tube 12, 14c, 26, 30, 34, 48 Bolt through hole 14 Joining metal fitting 14a End face plate 14b Elastic fitting piece 14c Bolt through hole 16 Weld nut (nut part) 20 Bolt 22 Both side bolt 24, 28, 32, 42 Color 38 Long bolt

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 23:00

Claims (3)

[Claims] 1. A plurality of screws which are fitted to the ends of a hollow fiber-reinforced synthetic resin tube body having a square hole shape and which are aligned with bolt through holes formed in the outer circumference of the ends of the tube body. A bolt is provided for connecting at least one end of the tubular body to a linear shape, an L-shape, a T-shape, or another three-dimensional shape, by providing a fitting fitting that matches the shape of the square hole provided with holes. A connection structure for a fiber-reinforced synthetic resin pipe body, characterized in that both pipe bodies are rigidly connected by a bolt by being screwed into a screw hole of the coupling fitting through a through hole. 2. The connecting fitting comprises a rectangular end face plate to be fitted to an end face of the tubular body, and four elastic fitting pieces that are bent and extend rearward from four edges of the end face plate. The connection structure for a fiber-reinforced synthetic resin pipe body according to claim 1, wherein a nut portion is formed on each of the face plate and the fitting piece. 3. A collar having a shape corresponding to the connection shape is fitted on the outer periphery of the connection portion of the pipe body, and the bolt is threaded through the bolt and a through hole formed on the outer periphery of the pipe body of the coupling fitting. The connection structure for a fiber-reinforced synthetic resin pipe body according to claim 1 or 2, wherein the connection structure is made to be screwed into the hole.