JP2771044B2 - Flexible joint made of resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-made flexible joint which is used to connect a pipe buried underground and through which a cable or the like is inserted.

[0002]

2. Description of the Related Art Conventionally, as a flexible joint which is used to connect a pipe buried underground and through which a cable or the like is inserted, as shown in Japanese Utility Model Laid-Open No. 21389/1990. Are known.

That is, as shown in FIG. 8, a flexible joint a is formed by forming a pipe insertion portion b at both ends of a cylindrical body and a flexible portion c at a center portion. A plurality of protrusions d are provided on the inner peripheral surface c.

[0004]

However, in the case of the above-mentioned conventional flexible joint, the following inconvenience occurs.

[0005] That is, rigidity is secured by a plurality of ridges d provided on the inner peripheral surface of the flexible portion c, but the flexible portion c that is to be flexibly deformed is formed by the ridge d. Come outside. Therefore, the outer diameter of the flexible portion c becomes larger than that of the conduit e. Such an increase in the outer diameter means that it becomes difficult to obtain flexibility. For this reason, it is conceivable to reduce the thickness of the flexible portion c so as to have flexibility. However, in this case, the joint may be broken, which is not preferable.

The present invention has been made in view of the above circumstances, and has as its object to provide a flexible joint capable of maintaining a good balance between flexibility and rigidity.

[0007]

According to the present invention, there is provided a resin-made flexible joint in which a pipe insertion portion is formed at both ends of a cylindrical body and a flexible portion is formed at a center portion. In the joint, the flexible portion has an inner diameter substantially equal to the inner diameter of the conduit, and has at least two concave grooves on the outer peripheral surface thereof , and at least one protrusion protruding between the concave grooves. Is formed over the entire circumference, and the end of the insertion portion
Has a built-in reinforcing material .

Further, in this resin-made flexible joint, a plurality of grooves are formed over the entire circumference on the outer peripheral surface on the center side of the end portion in which the reinforcing material of the insertion portion is embedded. .

[0009]

According to the resin-made flexible joint of the present invention, the flexible portion has:
The inner diameter is made substantially the same as the inner diameter of the conduit, and at least two concave grooves and at least one ridge projecting between the concave grooves are formed on the entire outer peripheral surface thereof. Form across ,
The internal reinforcement to the end of the spigot, complement
The cylindrical portion that is to be flexibly deformed other than the end of the insertion portion reinforced with the strong material is formed with a pipe diameter substantially equal to the pipe line, and at the same time, the flexibility of this cylindrical body portion is increased. And the rigidity will be determined by adjusting the groove width and groove depth of the concave groove.

[0010] In this resin-made flexible joint, a plurality of grooves are formed on the outer peripheral surface on the center side of the end portion in which the reinforcing material of the insertion portion is built in over the entire periphery, so that the rigidity is improved. And end with built-in stiffener at the insertion part of the flexible joint
Obtained over the entire cylindrical part .

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the entire structure of a flexible joint 1 made of resin . That is, this resin-made flexible joint 1
An insertion portion 12 for inserting the tube 2 is formed on both sides of the flexible portion 11.

The flexible portion 11 has an inner diameter which is equal to that of the insertion portion 12.
The inner diameter of the tube 2 is substantially the same as the inner diameter of the tube 2 inserted into the tube. On the outer peripheral surface of the flexible portion 11, three concave grooves 13 are formed at equal intervals over the entire circumference. The number of the grooves 13 and the shape of the grooves are not particularly limited, and various shapes can be formed as shown in FIGS. 2 (a) to 2 (d). However, the groove width w and the remaining depth t of the groove must be determined so that deformation when a shearing force in the direction of arrow A is applied is small, and flexibility for bending can be ensured. for that reason,
It is preferable that the groove width w is narrow and the number of the concave grooves 13 is large. The thickness d of the flexible portion 11 is also formed to an appropriate thickness in consideration of the groove width w and the remaining depth t of the groove.

The insertion portion 12 has an outer diameter of the flexible portion 1.
It has the same outer diameter as 1. Also, the inner diameter of the flexible portion 1
The inner diameter of the flexible portion 1 is larger than that of the flexible portion 1.
A step 14 is formed between the step 1 and the step 1. This step 14
Is a step substantially equal to the thickness of the tube 2 inserted into the insertion portion 12. In addition, two grooves 15 are formed on the outer peripheral surface of the insertion portion 12 over the entire circumference. The number of grooves and the shape of the grooves 15 are not particularly limited. However, the concave groove 1 of the flexible portion 11
As in the case of 3, the rigidity is determined in consideration of the rigidity when a shear force is applied to the resin flexible joint 1 and the flexibility with respect to bending. Further, it is necessary that the reinforcing member 3 is built in the end of the insertion portion 12. As this reinforcing material 3, metal, F
RP or the like can be used.

The flexible joint 1 made of resin can be made of various materials such as unsaturated polyester resin, urethane resin and FRP.

As shown in FIGS. 3 and 4, a resin flexible joint 1 is manufactured by first impregnating a surface of an inner mold 5 with a glass fiber mat and a roving with an unsaturated polyester resin. The material 10 is wound. And
When this resin material 10 is laminated to a predetermined thickness,
The outer mold 6 made of rubber or the like is covered. The outer mold 6 is an annular one that can be opened and closed by a hinge (not shown), and is attached to the laminated resin material 10 so as to fit. Thereafter, a resin material 10 is placed between these outer molds 6.
Is wound, laminated, and after uniforming the outer diameter, it is cured. Then, if necessary, as shown in FIG.
The packing 41 is adhesively fixed to the end of the. FIG.
As shown in (a) and (b), the packing 42 is also adhesively fixed to the step portion 14. The packings 41, 42
May be mounted on the inner mold 5 in advance without bonding and fixing after molding, and then the resin material 10 may be wound and laminated. As the packings 41 and 42, EPDM, S
Various shapes made of a rubber material such as BR can be used.

Note that, as shown in FIG.
If such burying the resin flexible joints 1 in the ground, said tree
The periphery of the flexible joint 1 made of oil may be covered with a cylindrical body 7 that does not affect the flexibility. In this case, it is possible to prevent earth and sand from entering the concave groove 13 and there is no possibility that the flexibility is hindered.

[0018]

As described above, according to the present invention, since the cylindrical portion which is to be flexibly deformed is formed with a pipe diameter substantially equal to the pipe path, the groove width and the groove depth of this concave groove are provided. By adjusting, a resin-made flexible joint having an excellent balance between flexibility and rigidity of the cylindrical body portion can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially broken side view schematically showing an overall configuration of a resin-made flexible joint according to the present invention.

FIG. 2 is an end view showing various shapes of a concave groove.

FIG. 3 is a drawing showing a manufacturing process of the resin-made flexible joint, and is a cross-sectional view showing a state where a resin material is laminated on an inner mold.

FIG. 4 is a cross-sectional view illustrating a process of manufacturing the resin-made flexible joint, in which a resin material is laminated on an inner mold and an outer mold is attached.

FIG. 5 is a partial sectional view showing a state in which packing is attached to an end of the insertion portion.

FIG. 6 is a partial cross-sectional view showing a state where packing is attached to a step portion.

FIG. 7 is a partially broken side view showing a state in which a tubular body is covered on a resin-made flexible joint.

FIG. 8 is a partially broken side view showing a conventional flexible joint.

[Explanation of symbols]

Reference Signs List 1 flexible joint made of resin 11 flexible part 12 insertion part 13 concave groove 15 groove part 2 pipe (pipe)

Claims (2)

(57) [Claims] 1. A resin-made flexible joint in which a pipe insertion portion is formed at both ends of a cylindrical body and a flexible portion is formed at a center portion , wherein the inner diameter of the flexible portion is a pipe. The inner diameter of the road is substantially the same as the inner diameter, and at least two concave grooves and at least one ridge projecting between the concave grooves are formed on the outer peripheral surface thereof over the entire circumference , The plug
A flexible joint made of resin, characterized in that a reinforcing material is incorporated at an end of the portion . 2. The resin-made flexible joint according to claim 1, wherein a plurality of grooves are formed over the entire circumference on an outer peripheral surface of the insertion portion at a center side of an end portion in which the reinforcing material is incorporated . A flexible joint made of resin characterized by the above-mentioned.