JP2018031457A - Connection structure and connection method of hard resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard resin pipe connection structure capable of enhancing connection workability for a hard resin pipe and preventing or suppressing damage of a seal member.SOLUTION: Into a socket 12 of one hard resin pipe 10A, a spigot 13 of the other hard resin pipe 10B is inserted. On an outer peripheral surface of the spigot 13, a seal member 14 is provided, and seals a gap between the spigot and the socket 12. On an outer peripheral surface on a spigot tip 13e side with respect to the seal member 14 in the spigot 13, an insertion side separation prevention member 30 is provided. On an inner peripheral surface of the socket 12, a reception side separation prevention member 20 is provided. In a connection state of the hard resin pipes 10, the reception side separation prevention member 20 is arranged between the insertion side separation prevention member 30 and the seal member 14.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tube connection structure and a connection method in which an insertion port of one tube is inserted into a receiving port of the other tube, and in particular, a fiber reinforced plastic tube (hereinafter referred to as “FRP tube”) or a fiber reinforced plastic composite. The present invention relates to a structure for connecting hard resin pipes such as pipes (hereinafter referred to as “FRPM pipes”) and a connection method.

  Generally, an insertion port is formed at one end of a hard resin tube such as an FRP tube or an FRPM tube, and a receiving port is formed at the other end. When connecting two hard resin pipes, the insertion hole of one hard resin pipe is inserted into the insertion hole of the other hard resin pipe. There are B-type and C-type connection methods for this type of hard resin tube. In the B type, an annular seal member is provided on the outer peripheral surface of the distal end portion of the insertion port, and seals between the inner peripheral surface of the receiving port. In the C shape, an annular seal member is provided on the inner peripheral surface of the distal end portion of the receiving port to seal between the outer peripheral surface of the insertion port.

  When an earthquake, an increase in pipe internal pressure, or the like occurs, a pulling force acts between the hard resin pipes, and there is a possibility that these hard resin pipes are disconnected. In order to prevent this, in both the B type and the C type, an insertion-side detachment prevention member is provided on the outer peripheral surface of the insertion port, and a reception-side detachment prevention member is provided on the inner peripheral surface of the reception port. (Refer to patent document 1 etc.). When the hard resin pipes are connected to each other, it is necessary that the separation preventing member on the side where the sealing member is not provided out of the insertion port and the receiving port ride over the sealing member and further over the separation preventing member on the other side.

JP 2001-263557 A

Since it is possible to elastically deform a resin tube such as a normal polyolefin-based resin tube or a vinyl chloride tube, it is not so difficult for each separation preventing member to get over the seal member and further over the other-side separation preventing member. However, since hard resin pipes such as FRP pipes are hardly elastically deformed, it is necessary to apply a large insertion force at the time of connection. If the insertion force is too large, the hard resin tube may be damaged or the seal member may be damaged.
An object of this invention is to provide the hard resin pipe connection structure and connection method which can prevent or reduce the damage of a sealing member while improving the connection construction property of a hard resin pipe in view of the said situation.

In order to solve the above problems, the present invention is a hard resin pipe connection structure comprising one hard resin pipe having an insertion opening and the other hard resin pipe having a receiving opening for receiving the insertion opening,
An annular seal member provided on the outer peripheral surface of the insertion port and sealing between the inner peripheral surface of the receiving port;
An insertion side detachment preventing member provided on the outer peripheral surface of the insertion port tip side than the seal member in the insertion port;
A receiving-side detachment preventing member provided on an inner peripheral surface of the receiving port;
The receiving-side detachment preventing member in the connected state between the hard resin tubes is disposed between the insertion-side detachment preventing member and the seal member.

According to the present invention, in the B-shaped hard resin pipe connection structure, when the receiving port and the insertion port are connected to each other, the receiving side separation preventing member of the receiving port does not need to get over the sealing member of the insertion port. Thereby, damage to the seal member can be prevented or reduced. And the insertion force at the time of the connection of a hard resin pipe | tube or a work amount can be reduced, and the connection construction property of a hard resin pipe | tube can be improved. When a pulling force is applied due to an earthquake or the like, the insertion side separation prevention member and the reception side separation prevention member abut against each other and are locked, thereby preventing the insertion port and the reception port from coming off, and thus a hard resin tube. It can be prevented that the two come off.
Here, the hard resin refers to a resin having a higher hardness than a general polyolefin resin or polyvinyl chloride. The elastic modulus of the hard resin is preferably 30000 kgf / cm ² (3000 MPa) or more.

It is preferable that at least one of the insertion-side detachment prevention member and the reception-side detachment prevention member is richer in elasticity than the hard resin tube.
Thus, the insertion force when the separation preventing members get over each other can be reliably reduced.

It is preferable that the insertion-side detachment preventing member is bonded to or can be bonded to the insertion port.
As a result, the insertion-side detachment preventing member can be manufactured separately from the insertion opening and attached to the insertion opening. The insertion side detachment preventing member may be adhered to the insertion port before the hard resin pipes are connected to each other.
When the insertion port is inserted into the receiving port, the insertion-side detachment preventing member may be separated from the insertion port, and the insertion-side detachment prevention member may be adhered to the insertion port after the insertion. That is, the insertion-side detachment preventing member may be able to adhere to the insertion opening. In this case, when the insertion port is inserted into the receiving port, the receiving-side detachment preventing member and the insertion-side detachment preventing member do not have to get over each other, and the required insertion force can be reliably reduced. As a result, the connection workability of the hard resin pipe can be improved.

The insertion side detachment preventing member may be fixed to the insertion opening by a mechanical fixing means such as a screw.
The insertion side detachment preventing member may be integrated with the insertion opening. A molding portion of the insertion-side detachment preventing member may be provided in the molding die for the insertion port so that the insertion-side detachment prevention member is molded integrally with the insertion port.

The receiving side separation preventing member may be made separately from the receiving port and attached to the receiving port. The receiving side separation preventing member may be bonded to the receiving port, or may be fixed by a mechanical fixing means such as a screw.
The receiving side separation preventing member may be integrated with the receiving port. It is also possible to provide a molding part of the receiving side detachment preventing member on the molding die of the receiving port so that the receiving side detachment preventing member is molded integrally with the receiving port.

A fitting groove is formed on one of the outer peripheral surface of the insertion port and the inner peripheral surface of the insertion-side detachment preventing member,
It is preferable that a fitting projection to be fitted in the fitting groove is formed on the other of the outer circumferential surface of the insertion port and the inner circumferential surface of the insertion-side detachment preventing member.
Thereby, the joint strength between the insertion side separation preventing member and the insertion opening can be increased. Furthermore, the locking strength at the time of the action of the withdrawal force can be increased.

The outer peripheral surface of the insertion port tip side is tapered toward the insertion port tip than the arrangement portion of the receiving side separation preventing member in the insertion port,
It is preferable that the inner peripheral surface of the insertion-side detachment preventing member has a tapered shape whose diameter increases toward the arrangement portion.
Thereby, even if the insertion-side detachment preventing member is made of a hard material such as metal or hard resin, the inner peripheral surface of the insertion-side detachment preventing member and the outer peripheral surface of the insertion opening can be reliably adhered. There is no need to set the clearance between the inner peripheral surface of the insertion side separation preventing member and the outer peripheral surface of the insertion port with high accuracy.

It is preferable that the insertion-side detachment preventing member is detachable from the insertion port.
Thus, when the insertion port is inserted into the receiving port, the insertion side separation preventing member can be separated from the insertion port. By doing so, it is not necessary for the receiving side detachment preventing member and the insertion side detachment preventing member to cross each other, and the insertion force when connecting the hard resin pipes can be greatly reduced. Further, even after the connection is once made, the hard resin pipes can be separated by removing the insertion-side detachment preventing member, and the connection work can be performed again.

The insertion-side detachment preventing member may be expandable and contractable by forming an annular shape having a notch at one place in the circumferential direction.
As a result, the insertion-side detachment preventing member can be brought into close contact with the outer peripheral surface of the insertion port by expanding the diameter and disposing it on the outer periphery of the insertion port and then reducing the diameter and reducing the diameter. The mounting operation can be further facilitated.

The method of the present invention is a method of connecting the hard resin pipes,
With the insertion side separation preventing member removed from the insertion port, the insertion port is inserted into the receiving port,
Then, the insertion side detachment preventing member is attached to the insertion port.
According to the method of the present invention, when the insertion port is inserted into the receiving port, it is not necessary for the receiving side separation preventing member and the insertion side separation preventing member to cross each other, and the required insertion force can be greatly reduced. As a result, the connection workability of the hard resin pipe can be improved. The attachment step may be performed by an operator entering the inside of the hard resin tube, or may be performed using a dedicated jig or device.

  ADVANTAGE OF THE INVENTION According to this invention, the connection construction property of a hard resin pipe | tube can be improved and damage to a sealing member can be prevented or reduced.

FIG. 1 is a front view showing the hard resin pipe connection structure according to the first embodiment of the present invention in a connected state between two hard resin pipes. FIG. 2 is a plan cross-sectional view of the hard resin pipe connection structure in the connected state along the line II-II in FIG. FIG. 3 is a plan sectional view showing the insertion port and the receiving port of the hard resin pipe connection structure in a state before connection. 4 (a) to 4 (c) are cross-sectional views sequentially showing connecting steps of hard resin pipes. FIG. 5 is a cross-sectional view showing a state when a pulling force acts on two hard resin tubes. FIG. 6 is a plan cross-sectional view of the hard resin pipe connection structure according to the second embodiment of the present invention. FIG. 7 is a plan sectional view showing the hard resin pipe connection structure according to the third embodiment of the present invention in a state before the insertion port and the connection port are connected. FIGS. 8A to 8C are plan sectional views sequentially showing the connecting steps of the hard resin tubes in the hard resin tube connecting structure according to the third embodiment. FIGS. 9A and 9B are plan sectional views sequentially showing the connecting steps of the hard resin pipes in the hard resin pipe connecting structure according to the fourth embodiment of the present invention. 10 (a) and 10 (b) are plan sectional views sequentially showing the connecting steps of the hard resin tubes in the hard resin tube connecting structure according to the fifth embodiment of the present invention. FIG. 11 is a perspective view of an insertion-side detachment preventing member according to the sixth embodiment of the present invention. 12A to 12C are cross-sectional views sequentially showing the connecting steps of the hard resin tubes in the hard resin tube connecting structure according to the sixth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1 to 5 show a first embodiment of the present invention. As shown in FIG. 1, the embodiment of the present invention relates to a connection structure 1 for a plurality of hard resin tubes 10 (only two are shown in the figure). These hard resin pipes 10 are connected in a row and are provided as, for example, a sewer pipe, an agricultural water pipe, or the like. Each hard resin tube 10 is made of a hard resin such as FRP or FRPM.

An insertion port 13 is provided at one end (right end in FIG. 1) of each hard resin tube 10, and a receiving port 12 is provided at the other end (left end in FIG. 1). As shown in FIGS. 1 and 2, the insertion port 13 of one hard resin tube 10A (left side in the figure) of two adjacent hard resin tubes 10 is connected to the receiving port 12 of the other hard resin tube 10B. By being accepted, these hard resin pipes 10A and 10B are connected to each other.
In the following description, unless otherwise specified, the insertion port 13 refers to that of the hard resin tube 10A, and the receiving port 12 refers to that of the hard resin tube 10B.

  As shown in FIG. 3, a seal member 14 is provided in the insertion opening 13. Therefore, the hard resin pipe connection structure 1 is B-shaped. The seal member 14 is made of rubber or the like and has an annular shape. The outer diameter of the seal member 14 in the natural state is larger than the inner diameter of the receiving port 12. As shown in FIG. 2, in the connection state between the hard resin pipes 10, the sealing member 14 is compressed and is brought into close contact with the entire circumference of the inner peripheral surface of the receiving port 12, whereby the insertion port 13 and the receiving port 12. The space between is sealed.

  As shown in FIG. 2, the hard resin pipe connection structure 1 is provided with means 15 for preventing the hard resin pipes 10 from being separated from each other. The separation prevention means 15 includes an insertion side separation prevention member 30 and a reception side separation prevention member 20. As shown in FIG. 3, an insertion-side detachment prevention member 30 is provided at the insertion opening 13, and a reception-side detachment prevention member 20 is provided at the reception opening 12.

  These separation preventing members 20 and 30 are separate from the hard resin tube 10. The separation preventing members 20 and 30 are made of a resin having appropriate elasticity and hardness. At least one of the separation preventing members 20 and 30 is more elastic than the hard resin tube 10. One of the separation preventing members 20 and 30 may be harder than the other, or may be as hard as or harder than the hard resin tube 10. Any one of the separation preventing members 20 and 30 may be made of a hard resin such as FRP or FRPM, or may have a laminated structure of FRP.

  As illustrated in FIG. 3, the insertion-side detachment preventing member 30 is disposed farther from the sealing member 14 in the insertion port 13 toward the insertion port distal end 13 e (right side in FIG. 3). Preferably, the insertion side detachment preventing member 30 is disposed near the insertion opening tip 13e.

The insertion-side detachment preventing member 30 is cylindrical or annular. The front end surface of the insertion side detachment preventing member 30 facing the side opposite to the seal member 14 (the right side in FIG. 3) is flush with the insertion port front end 13e. The inner peripheral surface of the insertion-side detachment preventing member 30 is a straight cylindrical surface. The outer peripheral surface of the insertion-side detachment preventing member 30 has a tapered shape that gradually increases in diameter toward the seal member 14 side (left side in FIG. 3). The thickness of the insertion-side detachment preventing member 30 increases as it goes toward the seal member 14 side.
In addition, the thickness of the insertion side detachment preventing member 30 may be constant over the entire length.

  The insertion-side detachment preventing member 30 and the insertion opening 13 are bonded via an adhesive (detailed illustration is omitted). As the adhesive, various adhesives such as an epoxy adhesive and a urethane adhesive can be applied. Instead of the adhesive or in addition to the adhesive, the insertion-side detachment preventing member 30 and the insertion opening 13 may be fixed by mechanical fixing means such as screws. When the insertion side detachment preventing member 30 has an FRP laminated structure, it is preferable that the insertion side 13 is laminated after being sanded.

As shown in FIG. 3, the receiving-side detachment preventing member 20 is arranged on the inner peripheral surface of the receiving port 12, away from the receiving end 12 e in the receiving port 12 on the back side (right side in FIG. 3). The receiving-side detachment preventing member 20 has a cylindrical shape or an annular shape. The outer peripheral surface of the receiving side separation preventing member 20 is a straight cylindrical surface. The inner peripheral surface of the receiving-side detachment preventing member 20 has a tapered shape that gradually increases in diameter toward the receiving end 12e side (left side in FIG. 3). The thickness of the receiving side separation preventing member 20 is reduced toward the receiving end 12e.
In addition, the thickness of the receiving side detachment preventing member 20 may be constant over the entire length.

  The receiving side separation preventing member 20 and the receiving port 12 are bonded via an adhesive (detailed illustration is omitted). As the adhesive, various adhesives such as an epoxy adhesive and a urethane adhesive can be applied. Instead of the adhesive or in addition to the adhesive, the receiving side separation preventing member 20 and the receiving port 12 may be fixed by a mechanical fixing means such as screwing. When the receiving side separation preventing member 20 has an FRP laminated structure, it is preferable to laminate the receiving port 12 after sanding.

As shown in FIG. 2, in the connection state between the two hard resin tubes 10 </ b> A and 10 </ b> B, the insertion-side detachment preventing member 30 and the receiving-side detachment preventing member 20 are connected to the outer peripheral surface of the insertion port 13 and the inner periphery of the receiving port 12. It is arranged in an annular clearance (gap) between the surfaces. In addition, in the axial direction of the hard resin tube 10, the receiving-side detachment preventing member 20 is disposed between the insertion-side detachment preventing member 30 and the seal member 14. Preferably, the receiving-side detachment preventing member 20 is arranged farther from the sealing member 14 toward the insertion tip 13e side (right side in FIG. 2) and is not in contact with the sealing member 14. Further, the outer diameter of the insertion-side detachment preventing member 30> the inner diameter of the receiving-side detachment preventing member 20.
When a force in the separation direction is applied to the resin tube 10, a force in the compression direction may be applied to the insertion side separation prevention member 30 and the reception side separation prevention member 20 to be deformed, but the deformation is not applied to the seal member 14. It will not be damaged.

<Connection method of hard resin tube 10>
The two hard resin tubes 10 are connected as follows.
The insertion side detachment preventing member 30 and the seal member 14 are installed in the insertion port 13 in advance, and the reception side detachment prevention member 20 is installed in the reception port 12 in advance.
As shown in FIG. 4A, the hard resin tubes 10 are arranged on a straight line, and the insertion port 13 is inserted into the receiving port 12.
As shown in FIG. 4 (b), the separation preventing members 20 and 30 eventually come into contact with each other. Here, by applying a strong insertion force, the separation preventing members 20 and 30 are overcome each other. By constituting at least one of the separation preventing members 20 and 30 with an elastic material, the one separation preventing member can be elastically deformed. Therefore, the required insertion force can be reduced. Furthermore, since the inner peripheral surface of the receiving-side detachment preventing member 20 and the outer peripheral surface of the insertion-side detachment preventing member 30 are respectively tapered, the insertion can be further facilitated.

  As shown in FIG. 4 (c), the receiving side separation preventing member 20 is positioned between the insertion side separation preventing member 30 and the seal member 14 by the overcoming. Further, a portion of the receiving port 12 on the receiving tip 12e side (left side in the figure) from the receiving-side detachment preventing member 20 is in pressure contact with the seal member 14. Thereby, the connection operation between the hard resin tubes 10 is completed. It is not necessary for the receiving side separation preventing member 20 to get over the seal member 14. Therefore, it is sufficient to increase the insertion force only when the insertion-side separation preventing member 30 gets over the reception-side separation prevention member 20, and the work amount at the time of connection can be reduced. The seal member 14 only needs to be subjected to a load due to pressure contact with the receiving port 12, and damage to the seal member 14 can be prevented or reduced.

  As shown in FIG. 5, when a pulling force F acts on the hard resin pipes 10A and 10B due to an earthquake or an increase in pipe internal pressure, the hard resin pipes 10A and 10B are displaced relative to each other in the drawing direction. The receiving-side detachment preventing member 20 abuts against the insertion-side detachment preventing member 30 and is locked. Thereby, it is possible to prevent the hard resin tubes 10A and 10B from being detached.

Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for the same configurations as those already described, and the description thereof is omitted.
Second Embodiment
FIG. 6 shows a second embodiment of the present invention. In the hard resin pipe connection structure 1B according to the second embodiment, the insertion opening 13 and the insertion-side detachment preventing member 30B are concavo-convexly fitted. Specifically, a fitting groove 13b is formed on the outer peripheral surface of the insertion port 13 in the vicinity of the insertion tip 13e. The fitting groove 13 b has an annular shape that extends over the entire circumference of the insertion opening 13. A fitting protrusion 33 is formed on the inner peripheral surface of the insertion-side detachment preventing member 30B. The fitting protrusion 33 has an annular shape over the entire circumference in the circumferential direction of the insertion-side detachment preventing member 30B. The fitting protrusion 33 is fitted in the fitting groove 13b.
Thereby, the joining strength between the insertion-side detachment preventing member 30B and the insertion opening 13 can be increased. As a result, it is possible to increase the locking strength when the pulling force F (see FIG. 5) is applied.

<Third Embodiment>
7 and 8 show a third embodiment of the present invention. As shown in FIG. 7, in the hard resin tube connection structure 1 </ b> C according to the third embodiment, the insertion-side detachment preventing member 30 </ b> C is manufactured separately from the insertion port 13 and can be bonded to the insertion port 13. . That is, the insertion-side detachment preventing member 30 </ b> C can be attached to the insertion opening 13 after the insertion opening 13 and the receiving opening 12 are fitted.

The receiving-side detachment preventing member 20 of the hard resin pipe connection structure 1C has a straight cylindrical shape with a constant thickness over the entire length. The insertion-side detachment preventing member 30C has a straight cylindrical shape with a constant thickness over the entire length.
In addition, the inner peripheral surface of the receiving-side detachment preventing member 20 and the outer peripheral surface of the insertion-side detachment preventing member 30 may be tapered similar to the first embodiment (FIG. 2).

As shown in FIG. 7, in the third embodiment, the insertion-side separation preventing member 30 </ b> C is separated from the insertion opening 13 before the hard resin tubes 10 </ b> A and 10 </ b> B are joined together. The separated insertion-side detachment preventing member 30C may be disposed inside the hard resin tube 10B.
As shown in FIG. 8A, the insertion opening 13 is inserted into the receiving opening 12 in this state. As a result, as shown in FIG. 8B, the insertion port 13 is inserted into the receiving side separation preventing member 20 and the seal member 14 is pressed against the inner peripheral surface of the receiving port 12. Since no insertion-side detachment preventing member 30C is provided at the insertion opening 13, it is not necessary to cross the detachment preventing members 20, 30C with each other, and the required insertion force can be greatly reduced.

As shown in FIG. 8B, after the insertion port 13 is inserted into the receiving port 12 until the receiving side separation preventing member 20 comes to a predetermined position near the seal member 14, the receiving side separation preventing member at the insertion port 13 is inserted. An adhesive (not shown) is applied to the outer peripheral surface closer to the insertion opening tip 13 e than 20. Alternatively, an adhesive may be applied to the inner peripheral surface of the insertion side separation preventing member 30C.
Subsequently, as illustrated in FIG. 8C, the insertion-side detachment preventing member 30 </ b> C is fitted to the outer periphery of the insertion port 1 on the insertion port distal end 13 e side than the receiving-side detachment prevention member 20. Thereby, the receiving side separation preventing member 20 is disposed between the seal member 14 and the insertion side separation preventing member 30C. It is not necessary for the receiving side separation preventing member 20 to get over the seal member 14, and damage to the seal member 14 can be prevented or reduced.
The insertion of the insertion side separation preventing member 30C into the insertion opening 13 may be performed by the operator entering the inside of the hard resin tube 10 or using a dedicated jig or device. Thereafter, the insertion side separation preventing member 30C and the insertion opening 13 are bonded together by curing until the adhesive is cured. As the adhesive, a void filling adhesive may be used.

<Fourth embodiment>
FIG. 9 shows a fourth embodiment of the present invention. The fourth embodiment is a combination of the retrofit method of the third embodiment (FIGS. 7 and 8) and the concave-convex fitting of the second embodiment (FIG. 6). That is, in the hard resin pipe connection structure 1D of the fourth embodiment, the insertion-side detachment preventing member 30D can be attached to the insertion opening 13 after the insertion opening 13 and the receiving opening 12 are fitted. And the fitting protrusion 33 is formed in the inner peripheral surface of insertion side detachment prevention member 30D. A fitting groove 13 b is formed on the outer peripheral surface of the insertion opening 13.

As shown in FIG. 9A, when inserting the insertion opening 13 into the receiving opening 12, the insertion-side detachment preventing member 30 </ b> D is separated from the insertion opening 13. Therefore, it is not necessary to get over the separation preventing members 20 and 30D, and the required insertion force can be greatly reduced.
As shown in FIG. 9B, after the insertion opening 13 is inserted, the insertion-side detachment preventing member 30 </ b> D is fitted into the outer periphery of the insertion opening 13. At this time, the fitting protrusion 33 is press-fitted because it interferes with the insertion opening 13, but the insertion force is greater than when the separation preventing members 20 and 30 are moved over each other (FIG. 4B, etc.). Can be greatly reduced. An impact jig or the like may be used for press-fitting.

As shown in FIG. 9B, the fitting protrusion 33 eventually fits into the fitting groove 13b. Thereby, the insertion side detachment preventing member 30 </ b> D can be positioned and arranged on the outer peripheral surface of the insertion port 13. In addition, the bonding strength between the insertion-side detachment preventing member 30D and the insertion opening 13 can be increased. Furthermore, when the pull-out force F (see FIG. 5) acts, it is possible to ensure a sufficient locking force against this.
Furthermore, the insertion opening 13 and the insertion-side detachment preventing member 30D may be bonded with an adhesive. As the adhesive, a void filling adhesive may be used.

<Fifth Embodiment>
FIG. 10 shows a fifth embodiment of the present invention. 5th Embodiment concerns on the deformation | transformation aspect of 3rd Embodiment (FIG. 8) which retrofits the insertion side detachment | leave prevention member. In the hard resin pipe connection structure 1E, the tapered portion 13a is formed on the outer peripheral surface of the insertion port 13 on the insertion port tip 13e side (right side in FIG. 10A) with respect to the arrangement portion of the receiving side separation preventing member 20 in the insertion port 13. . The tapered portion 13a is gradually reduced in diameter toward the insertion tip 13e and reaches the insertion tip 13e. The distal end side portion of the insertion opening 13 is thinner toward the insertion opening distal end 13e.

The insertion-side detachment preventing member 30E is made of metal (hard material). Note that the insertion-side detachment preventing member 30E may be made of a hard resin such as FRP or FRPM. The inner peripheral surface of 30E is a tapered portion 36. The taper portion 36 is gradually enlarged in diameter toward the arrangement side (left side in FIG. 10A) of the receiving side separation preventing member 20. Therefore, the insertion-side detachment preventing member 30E is thinner toward the arrangement side of the receiving-side detachment preventing member 20. The angle of the taper portion 36 matches the angle of the taper portion 13a.
In FIG. 10, the inclination angles of the tapered portions 36 and 13a are exaggerated.

As shown in FIG. 10A, when inserting the insertion opening 13 into the receiving opening 12, the insertion-side detachment preventing member 30 </ b> E is separated from the insertion opening 13. Therefore, it is not necessary to get over the separation preventing members 20 and 30E, and the required insertion force can be greatly reduced.
As shown in FIG. 10B, after the insertion opening 13 is inserted, the insertion-side detachment preventing member 30 </ b> E is fitted into the outer periphery of the insertion opening 13. Since the inner peripheral surface of the insertion-side detachment preventing member 30E and the outer peripheral surface of the insertion port 13 are both tapered portions 36 and 13a, the insertion-side detachment prevention member 30E and the insertion port 13 can be brought into close contact with each other over the entire circumference. . Even if the insertion-side detachment preventing member 30E is made of a hard material such as metal or hard resin, the insertion-side detachment prevention member 30E and the insertion opening 13 can be reliably brought into close contact with each other. Therefore, it is not necessary to set the clearance between the inner peripheral surface of the insertion-side detachment preventing member 30E and the outer peripheral surface of the insertion port 13 with high accuracy.
The insertion-side detachment preventing member 30E and the insertion opening 13 are bonded with an adhesive. As the adhesive, a void filling adhesive may be used.

<Sixth Embodiment>
11 and 12 show a sixth embodiment of the present invention. 6th Embodiment concerns on the deformation | transformation aspect of 3rd Embodiment (FIG. 8) which retrofits the insertion side detachment | leave prevention member. As shown in FIG. 11, in the hard resin pipe connection structure 1 </ b> F of the sixth embodiment, the insertion-side detachment preventing member 30 </ b> F has an annular shape (C shape) having a cutout portion 35 at one place in the circumferential direction. . The material of the insertion-side detachment preventing member 30F is made of a metal (hard material) such as iron, steel, or stainless steel. Preferably, the insertion side detachment preventing member 30F is made of spring steel. The insertion side separation preventing member 30F may be made of FRP or other hard resin instead of metal.

  The insertion-side detachment preventing member 30F can be expanded / contracted by applying a diameter expansion force or a diameter reduction force. The inner diameter of the insertion-side detachment preventing member 30F in a natural state (an unloaded state in which no diameter expansion force or diameter reduction force is applied) is preferably smaller than the outer diameter of the insertion port 13. In addition, the outer diameter of the insertion-side detachment preventing member 30F in the natural state is preferably smaller than the inner diameter of the receiving port 12. The insertion side detachment preventing member 30 </ b> F may be detachable from the insertion opening 13.

A fitting protrusion 33 is formed on the inner peripheral surface of the insertion-side detachment preventing member 30F. The fitting protrusion 33 extends along the circumferential direction of the insertion-side detachment preventing member 30F.
As shown in FIG. 12, a fitting groove 13 b is formed on the outer peripheral surface of the insertion opening 13. The fitting groove 13 b has a closed ring shape along the circumferential direction of the insertion opening 13.

  As shown in FIG. 12A, when connecting the hard resin pipes 10, the insertion side separation preventing member 30 </ b> F is separated from the insertion port 13. Then, the insertion port 13 is inserted into the receiving port 12, and the receiving-side detachment preventing member 20 is disposed between the seal member 14 and the fitting groove 13b. It is not necessary for the receiving side separation preventing member 20 to get over the seal member 14. Therefore, damage to the seal member 14 can be suppressed or prevented.

  Subsequently, as illustrated in FIG. 12B, the insertion-side detachment preventing member 30 </ b> F is fitted to the outer periphery of the insertion opening 13. At this time, the insertion side separation preventing member 30F is expanded in diameter, and the width of the notch 35 is increased. Thereby, it is possible to avoid the fitting protrusion 33 from interfering with the insertion opening 13. Or the interference degree of the fitting protrusion 33 and the insertion port 13 can be made small, and a required pressure input can be reduced. Therefore, the insertion operation of the insertion-side detachment preventing member 30F can be easily performed.

  When the fitting protrusion 33 comes to a position where it matches the fitting groove 13b, the diameter expansion of the insertion side separation preventing member 30F is released. As a result, the insertion side separation preventing member 30F is reduced in diameter by the elastic restoring force, the inner peripheral surface of the insertion side separation preventing member 30F is in close contact with the outer peripheral surface of the insertion port 13, and the fitting protrusion 33 is fitted into the fitting groove 13b. Fits into. Therefore, the insertion-side detachment preventing member 30 </ b> F can be prevented from coming off from the insertion opening 13.

  The insertion-side detachment preventing member 30F can be attached to and detached from the insertion opening 13 even after the hard resin pipes 10 are connected to each other. Therefore, when there is a problem in the connection, the insertion-side detachment preventing member 30F can be removed from the insertion opening 13 by increasing the diameter of the insertion-side detachment preventing member 30F. As a result, the hard resin tubes 10 can be separated. Thereby, connection construction can be redone.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in 2nd Embodiment (FIG. 6) etc., the fitting protrusion 33 may be provided in the insertion port 13, and the fitting groove 13b may be provided in the insertion side detachment preventing member 30B.
A plurality of embodiments may be combined with each other. For example, the insertion side detachment preventing member 30F may be attached to the insertion opening 13 and then adhered with an adhesive.

  The present invention can be applied to, for example, a joint structure of a sewer pipe or an agricultural water pipe.

1, 1B to 1F Hard resin pipe connection structure 10 Hard resin pipe 10A One hard resin pipe 10B The other hard resin pipe 12 20 receiving side separation preventing member 30, 30 </ b> B to 30 </ b> F insertion side separation preventing member 33 fitting protrusion 35 notch portion 36 taper portion

Claims (8)

A hard resin pipe connection structure comprising one hard resin pipe having an insertion opening and the other hard resin pipe having a receiving opening for receiving the insertion opening,
An annular seal member provided on the outer peripheral surface of the insertion port and sealing between the inner peripheral surface of the receiving port;
An insertion side detachment preventing member provided on the outer peripheral surface of the insertion port tip side than the seal member in the insertion port;
A receiving-side detachment preventing member provided on an inner peripheral surface of the receiving port;
The hard resin pipe connection structure is characterized in that the receiving side separation preventing member in a connection state between the hard resin pipes is disposed between the insertion side separation preventing member and the seal member.   2. The hard resin pipe connection structure according to claim 1, wherein at least one of the insertion-side detachment prevention member and the reception-side detachment prevention member is more elastic than the hard resin pipe.   The hard resin pipe connection structure according to claim 1 or 2, wherein the insertion-side detachment preventing member is bonded to or can be bonded to the insertion port. A fitting groove is formed on one of the outer peripheral surface of the insertion port and the inner peripheral surface of the insertion-side detachment preventing member,
The fitting projection to be fitted in the fitting groove is formed on the other of the outer circumferential surface of the insertion port and the inner circumferential surface of the insertion-side detachment preventing member. The hard resin pipe connection structure according to claim 1. The outer peripheral surface of the insertion port tip side is tapered toward the insertion port tip than the arrangement portion of the receiving side separation preventing member in the insertion port,
The hard resin pipe connection structure according to any one of claims 1 to 4, wherein an inner peripheral surface of the insertion-side detachment preventing member has a tapered shape whose diameter increases toward the arrangement portion.   The hard resin pipe connection structure according to claim 1, wherein the insertion-side detachment preventing member is detachable from the insertion port.   The hard resin pipe connection structure according to any one of claims 1 to 6, wherein the insertion-side detachment preventing member can be expanded and contracted by forming an annular shape having a notch at one place in a circumferential direction. A method for connecting the hard resin pipes according to any one of claims 1 to 7,
With the insertion side separation preventing member removed from the insertion port, the insertion port is inserted into the receiving port,
Then, the connection method of the hard resin pipe | tube characterized by attaching the said insertion side detachment | leave prevention member to the said insertion port.

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