JP7499077B2 - Pipe body separation prevention joint, separation prevention structure, and construction method of separation prevention structure - Google Patents

Description

This invention relates to a separation prevention joint that connects pipes while preventing them from separating, a separation prevention structure, and a method for installing the separation prevention structure.

In pipelines for agricultural water, drinking water, etc., the pipes' insertion ports are connected to each other by cylindrical joints. A watertight material is interposed between the pipes and the joints to prevent water leakage, and a separation prevention structure is used to prevent the joints from separating from the pipes.

For example, in the tube removal prevention mechanism shown in Patent Document 1, a locking projection 3 is provided at the tip of the outer circumferential surface of the insertion tube 1, and a retaining member 4 and a watertight member 5 are provided on the inner circumferential surface of the receiving tube 2.

The locking projection 3 is formed with an inclined surface 3a that reduces the radial thickness toward the tip of the insertion side tube 1, and a contact wall 3b that stands outward in the radial direction is formed at the rear end. The locking projection 3 is, for example, a hard member made of a laminate of multiple layers of resin-impregnated fibers impregnated with resin. The retaining member 4 is formed with a rounded portion 4a on its inner diameter side that reduces the radial thickness toward the tip of the receiving side tube 2, and a contact wall 4b that stands outward in the radial direction is formed at the rear end. The watertight member 5 is formed with an annular protrusion 5a that stands outward in the radial direction on its inner diameter side, and this annular protrusion 5a is formed with an inclined surface 5b that reduces the radial thickness toward the tip of the receiving side tube 2, and a standing surface 5c that stands outward in the radial direction is formed at the rear end. The retaining member 4 and the watertight member 5 are made of an elastic material such as rubber.

When the inserting pipe 1 is connected to the receiving pipe 2, the rounded portion 4a formed on the retaining member 4 and the inclined surface 5b formed on the annular protrusion 5a of the watertight member 5 are deformed and guided by the inclined surface 3a formed on the locking projection 3. In addition, when a pulling force acts on both pipes 1 and 2, such as during an earthquake, the abutment wall 3b formed on the locking projection 3 comes into contact with the abutment wall 4b formed on the retaining member 4, thereby preventing separation (see paragraphs 0016-0025 and Figure 1 of Patent Document 1).

JP 2017-2996 A

In the configuration of Patent Document 1, when the insertion side tube body 1 and the receiving side tube body 2 are connected, the retaining member 4 and the watertight member 5 made of an elastic material are inserted into the locking protrusion 3 made of a hard material while being deformed and subjected to frictional force. For this reason, when inserting, the tube must be inserted against the insertion resistance, which requires a lot of effort and may place excessive load on the retaining member 4 and the watertight member 5, reducing their durability.

Therefore, the objective of this invention is to improve the durability of the anti-slip member and watertight member provided between the tube body and the joint ring, thereby improving the function of preventing the tube body from coming off and the function of stopping water.

In order to solve the above problems, this invention provides a pipe detachment prevention joint that includes a pipe body made of a resin material, a pressure ring inserted into the outer peripheral surface of the insertion opening of the pipe body, a joint ring inserted coaxially with the pressure ring, a fastening member that fastens the pressure ring and the joint ring together, a ring-shaped water-stopping member that is interposed between the pressure ring and the joint ring and is pressed against the outer peripheral surface of the pipe body by fastening the fastening member, a first stopper portion provided on the joint ring, and a second stopper portion that is separate from the pipe body before insertion of the pipe body and is attached to the outer peripheral surface of the insertion opening after the pipe body is inserted, and that abuts against the first stopper portion when a pull-out force acts on the pipe body to prevent the pipe from coming off.

In this way, the second stopper part can be provided on the tube after the pressure ring, joint ring, water-stopping member, and first stopper part are inserted into the tube, so that there is no insertion resistance from the second stopper part when inserting the water-stopping member and first stopper part. This allows the tubes to be connected smoothly, and improves the durability of the water-stopping member and the first stopper part, thereby preventing the tubes from coming off and improving the water-stopping effect.

In the above configuration, the first stopper portion and the second stopper portion can be configured to be made of a rigid body.

In this way, when a pulling force is applied to the tube, the stopper parts made of a rigid body come into contact with each other, providing a high level of prevention from coming loose. In addition, since the stopper parts made of a rigid body are more durable than stopper parts made of an elastic material such as rubber, it is expected that the effect of reducing the frequency of maintenance can also be expected.

When the first stopper portion and the second stopper portion are configured as rigid bodies, a laminated portion containing a resin that covers the surface of the second stopper portion and the outer peripheral surface of the tube body surrounding the second stopper portion can be provided.

In this way, the first stopper portion and the second stopper portion, both of which are rigid bodies, come into contact with each other via the laminated portion, which makes it possible to prevent problems such as cracks caused by the two stopper portions coming into direct, strong contact with each other. In addition, because the second stopper portion and the outer circumferential surface of the tube are covered with the laminated portion, it is possible to prevent the second stopper portion from falling off the outer circumferential surface of the tube due to its contact with the first stopper portion.

In addition, in this invention, a structure for preventing detachment of a pipe body is constructed, which includes the above-mentioned anti-detachment joints for the pipe body, which are attached to the insertion openings of a plurality of pipe bodies arranged adjacent to each other along the axial direction so as to face each other, and a connecting ring that connects the end portions of the anti-detachment joints for the pipe bodies on the insertion opening side.

In this way, when the connected pipes expand and contract significantly due to a major earthquake or other event, the expansion and contraction can be absorbed by multiple pipes, so it is possible to reliably prevent problems such as the expansion and contraction being concentrated in some pipes, causing the stopper section to break and fall off the joint ring.

Furthermore, in this invention, a construction method for preventing the detachment of a pipe body is configured, which includes an insertion step of inserting a pressure ring, a ring-shaped water-stopping member, and a joint ring in this order on the outer peripheral surface side of the insertion opening of a pipe body made of a resin material; an attachment step of attaching a second stopper part, which is separate from the pipe body and abuts against a first stopper part provided on the joint ring when a pull-out force is applied to the pipe body, to the outer peripheral surface of the pipe body, a fastening step of fastening the pressure ring and the joint ring together with a fastening member, and pressing the ring-shaped water-stopping member interposed between the pressure ring and the joint ring against the outer peripheral surface of the pipe body by fastening the fastening member; and a connecting step of connecting the joint rings attached to the insertion openings of a plurality of pipe bodies arranged adjacent to each other along the axial direction with a connecting joint ring.

In this way, after the pressure ring, water-stopping member, and first stopper portion are inserted into the pipe, the second stopper portion is provided on the pipe, so that there is no insertion resistance from the second stopper portion when inserting the water-stopping member and first stopper portion. This allows the pipes to be connected smoothly, and improves the durability of the water-stopping member and the first stopper portion, thereby preventing the pipes from coming off and improving the water-stopping effect. Furthermore, because adjacent joint rings are connected to each other by a connecting joint ring, when the connected pipes expand and contract significantly due to a major earthquake or the like, the expansion and contraction can be absorbed by multiple pipes, and it is possible to reliably prevent problems such as the expansion and contraction being concentrated in some pipes and causing them to fall off the joint rings.

In this invention, the second stopper portion provided on the tube is separate from the tube before the tube is inserted, and after the tube is inserted, the second stopper portion is attached to the outer circumferential surface of the tube's insertion opening. Therefore, when inserting the water-stopping member and the first stopper portion, there is no insertion resistance from the second stopper portion. This allows the tubes to be connected smoothly, and improves the durability of the water-stopping member and the first stopper portion, thereby preventing the tube from coming off and improving the water-stopping effect.

FIG. 1 is a cross-sectional view showing one embodiment of a pipe-body separation prevention structure according to the present invention; 1A is a cross-sectional view showing one embodiment of a method for constructing a pipe body detachment prevention structure according to the present invention, in which (a) shows a state in which a pressure ring, a water-stopping member, and a joint ring are inserted into the pipe body in this order, (b) shows a state in which a first stopper portion is provided on the joint ring, (c) shows a state in which a second stopper portion is attached to the opening of the pipe body, (d) shows a state in which the pressure ring and the joint ring are fastened together with a fastening member, and (e) shows a state in which the joint rings are connected to each other with a connecting joint ring. FIG. 2 is a cross-sectional view showing a state in which the first stopper portion and the second stopper portion are in contact with each other to prevent the tube from coming off in the separation prevention structure shown in FIG. 2A and 2B are cross-sectional views of the separation prevention structure shown in FIG. 1, in which (a) shows a state in which the tubes are most stretched relative to each other, and (b) shows a state in which the tubes are most contracted relative to each other.

The anti-detachment structure for a pipe body and the anti-detachment joint according to the present invention will be described with reference to the drawings. As shown in Fig. 1, Fig. 2(a), etc., the anti-detachment joint used in this anti-detachment structure includes a pipe body 1 made of a resin material, a pressure ring 2 inserted into the outer peripheral surface side of the insertion opening of the pipe body 1, a joint ring 3 inserted coaxially with the pressure ring 2 on the outer peripheral surface side of the insertion opening, a fastening member 4 fastening the pressure ring 2 and the joint ring 3 together, a ring-shaped water-stopping member 5 interposed between the pressure ring 2 and the joint ring 3, a first stopper portion 6 provided on the joint ring 3, and a second stopper portion 7 attached to the outer peripheral surface side of the pipe body 1. The anti-detachment structure is formed by connecting the joint rings 3 of the anti-detachment joint with a connecting joint ring 8.

The pipe body 1 is a resin pipe with a constant outer diameter over its entire length. Specifically, it is a composite pipe made of fiber-reinforced plastic (FRP) and mortar layers laminated together (FRPM pipe). A circumferential groove 9 for attaching the second stopper portion 7 is formed around the entire circumference on the outer circumferential surface side of the insertion opening of the pipe body 1. Inside the circumferential groove 9, bottomed pin holes 10 that do not penetrate to the inner circumference are formed at predetermined angles in the circumferential direction. Instead of the circumferential groove 9, a step can be formed against which one axial end of the second stopper portion 7 can be abutted.

The press ring 2 is a ring-shaped steel member with a through hole 11 at its center for passing the tube 1 through. This ring-shaped portion has through holes 12 formed at predetermined angles in the circumferential direction for passing the fastening members 4 in the axial direction. The axial end face of the press ring 2 facing the water-stopping member 5 forms a tapered surface 13 having a normal line that slopes toward the axial center of the press ring 2. A gap _g1 is formed between the through hole 11 formed at the center of the press ring 2 and the outer circumferential surface of the tube 1.

The collar 3 is a generally cylindrical steel member with a through hole 14 at its center through which the pipe 1 passes. A step 15 is formed on the inner peripheral surface of the collar 3, the size of which changes stepwise. A bottomed screw hole 16 is formed in the step 15 and extends in the axial direction of the collar 3. A first flange 17 and a second flange 18 are formed on the outer peripheral end of the collar 3, which stand outward in the radial direction. The first flange 17 has a through hole 19 for passing the fastening member 4, and the second flange 18 has a through hole 21 for passing the connecting member 20 that connects the collar 3 and the connecting collar 8. The surface of the collar 3 that contacts the water-stopping member 5 is an arc surface 22 that protrudes toward the water-stopping member 5.

The fastening member 4 is composed of a T-bolt 4a having a T-shaped head and a nut 4b. Other types of bolts, such as hexagonal bolts, can be used instead of the T-bolt 4a.

The water-stopping member 5 is made of elastic rubber. When the T-bolt 4a is inserted into the through hole 12 formed in the pressing ring 2 through the through hole 19 formed in the first flange 17 of the joint ring 3 and the nut 4b is screwed from the opposite side of the pressing ring 2 to fasten the fastening member 4, the pressing ring 2 and the joint ring 3 approach each other in the axial direction, and the water-stopping member 5 interposed between the pressing ring 2 and the joint ring 3 is pressed against the outer circumferential surface of the pipe body 1. This pressing increases the water-tightness, so that water leakage from between the pipe body 1 and the joint ring 3 can be reliably prevented. In this configuration, the pressing ring 2 has a tapered surface 13 and the joint ring 3 has an arc surface 22, so that the water-stopping member 5 is strongly pressed against the outer circumferential surface of the pipe body 1 by the tapered surface 13 and the arc surface 22. This ensures high water-tightness between the pipe body 1 and the joint ring 3.

The first stopper portion 6 is composed of two half-ring-shaped members obtained by dividing a ring-shaped member into two in the circumferential direction. The material of the first stopper portion 6 is steel, which is a rigid body. The ring-shaped portion has through holes formed therethrough in the axial direction at predetermined angles in the circumferential direction. The first stopper portion 6 is fitted into the step portion 15 formed on the inner peripheral surface side of the joint ring 3, and then a hexagonal bolt 23 is inserted into the through hole formed in the ring-shaped portion, and the hexagonal bolt 23 is screwed into the screw hole 16 formed in the joint ring 3, whereby the first stopper portion 6 is fixed to the inner peripheral surface of the joint ring 3. In this fixed state, a gap _g2 is formed between the inner peripheral surface of the ring of the first stopper portion 6 and the outer peripheral surface of the pipe body 1. The first stopper portion 6 can also be formed integrally with the joint ring 3.

As described above, gaps g1, g2 are formed between the through hole 11 formed in the center of the pressure ring ₂ and the outer peripheral surface of the tube body 1, and between the inner peripheral surface of the ring of the first stopper portion 6 and the outer peripheral surface of the tube body ₁ , so that some bending is permitted between the tube body 1 and the joint ring 3.

The second stopper portion 7 is composed of two half-ring-shaped members obtained by dividing a ring-shaped member in two in the circumferential direction. The material of the second stopper portion 7 is steel, which is a rigid body like the first stopper portion 6. The ring-shaped portion has through holes that penetrate in the radial direction at predetermined angles in the circumferential direction. The second stopper portion 7 is fitted into a circumferential groove 9 (see FIG. 2(a)) formed on the outer circumferential surface side of the tube body 1, and a pin 24 is inserted into the through hole and pin hole 10 (see FIG. 2(a)) formed in the ring-shaped portion.

The shapes of the first stopper portion 6 and the second stopper portion 7 are not limited to ring shapes. As long as the two stopper portions 6, 7 come into contact with each other when a pulling force is applied to the tube body 1 and can prevent it from coming out, they can be, for example, block-shaped members provided at predetermined angles in the circumferential direction.

A laminated portion 25 made of resin-impregnated fibers is provided on the surface of the second stopper portion 7 and on the outer peripheral surface of the tube body 1 around the second stopper portion 7, covering the surface and the outer peripheral surface. The material of the laminated portion 25 is not limited to this, and resin material, metal, mortar, or a laminated body made by laminating these materials can also be used as appropriate.

If the first stopper portion 6 and the second stopper portion 7 are made of a rigid material, a high degree of prevention of separation is achieved when the stopper portions 6 and 7 come into contact with each other due to the application of a pull-out force to the tube 1. In addition, the stopper portions 6 and 7 made of a rigid material are more durable than stopper portions made of an elastic material such as rubber, and therefore the effect of reducing the frequency of maintenance can be expected. Furthermore, since the second stopper portion 7 is provided with a laminated portion 25, the first stopper portion 6 and the second stopper portion 7, both of which are rigid bodies, come into contact with each other via the laminated portion 25. This makes it possible to prevent problems such as cracks occurring due to the stopper portions 6 and 7 coming into direct and strong contact with each other. In addition, since the second stopper portion 7 and the outer peripheral surface of the tube 1 are covered with the continuous laminated portion 25, it is possible to prevent the second stopper portion 7 from falling off the outer peripheral surface of the tube 1 due to contact with the first stopper portion 6.

As shown in this embodiment, instead of providing the laminated portion 25 on the second stopper portion 7, the laminated portion 25 can be provided on the first stopper portion 6. Also, the laminated portion 25 can be provided on both stopper portions 6, 7. Alternatively, the laminated portion 25 can be not provided on either stopper portion 6, 7.

In the above embodiment, the laminated portion 25 is formed only on the second stopper portion 7 and the outer peripheral surface of the tube body 1 around it, but the laminated portion 25 can also be extended to the inner peripheral surface of the tube body 1 so as to wrap around the insertion end of the tube body 1. In this way, for example, when the insertion ports of adjacent tube bodies 1 come into contact with each other due to shaking caused by an earthquake (see FIG. 4(b)), the insertion ports can be protected from damage.

The connecting collar 8 is a generally cylindrical steel member with a through hole 26 formed in the center through which the pipe body 1 passes. Flanges 27 are formed on both ends of the cylindrical outer peripheral surface side, rising outward in the radial direction. Each flange 27 is formed with a through hole 28 for passing a connecting member 20 that connects the connecting collar 3 and the connecting collar 8. This connecting member 20 is composed of a hexagonal bolt 20a and a nut 20b. When the hexagonal bolt 20a is inserted into the through hole 28 formed in the connecting collar 8 through the through hole 21 formed in the second flange 18 of the connecting collar 3, and the nut 20b is screwed from the opposite side of the connecting collar 8 to fasten the connecting member 20, the connecting collar 3 and the connecting collar 8 are connected. A ring-shaped watertight member 29 is sandwiched between the second flange 18 of the connecting collar 3 and the flange 27 of the connecting collar 8, and the watertight member 29 ensures watertightness between the two flanges 18 and 27.

The procedure for constructing the pipe body separation prevention structure is explained with reference to Figures 2(a) to (e). In this construction method, first, the pressure ring 2, the ring-shaped water-stopping member 5, and the joint ring 3 are inserted in this order into the outer circumferential surface side of the insertion opening of the pipe body 1 (insertion process) (see Figure 2(a)). At this stage, the second stopper portion 7 (see Figure 2(c)) has not yet been attached to the insertion opening of the pipe body 1, so the water-stopping member 5 and other members can be inserted without resistance. This allows the work to be done smoothly, and since no excessive load is applied when inserting the water-stopping member 5 and other members, their durability can be improved.

After inserting the pressure ring 2 into the tube body 1, the first stopper portion 6 is fitted into the step portion 15 formed on the inner peripheral surface of the joint ring 3, and a hexagonal bolt 23 is screwed into the threaded hole 16 formed in the joint ring 3 through the through hole formed in the first stopper portion 6, and the first stopper portion 6 is fixed to the inner surface of the joint ring 3 (see FIG. 2(b)).

Next, the second stopper portion 7 is fitted into the circumferential groove 9 formed on the outer peripheral surface side of the insertion opening of the tube body 1, and a pin 24 is inserted through a through hole formed in the second stopper portion 7 to a pin hole 10 formed in the tube body 1 (attachment process). Furthermore, a laminated portion 25 made of resin-impregnated fibers is provided on the surface of the second stopper portion 7 and on the outer peripheral surface of the tube body 1 around the second stopper portion 7 (see FIG. 2(c)).

The method for providing the laminated portion 25 is not particularly limited, but for example, a hand layup method can be used. The hand layup method is a method in which a mat of reinforcing fibers is set in the area where the laminated portion 25 is to be provided (in this embodiment, the surface of the second stopper portion 7 and the outer circumferential surface of the tube body 1 around the second stopper portion 7), and the reinforcing fibers are impregnated with resin by manual work using a brush, roller, or the like. With the hand layup method, the FRP lining can be applied more uniformly than with the conventional lining method in which a mixture of resin and reinforcing fibers is sprayed onto the area where the laminated portion 25 is to be provided.

Furthermore, when the T-bolt 4a is inserted through the through hole 19 formed in the first flange 17 of the joint ring 3 and into the through hole 12 formed in the pressure ring 2, and the nut 4b is screwed in from the opposite side of the pressure ring 2 to fasten the fastening member 4, the pressure ring 2 and the joint ring 3 approach each other in the axial direction, and the water-stopping member 5 interposed between the pressure ring 2 and the joint ring 3 is pressed against the outer circumferential surface of the pipe body 1 (fastening process) (see Figure 2 (d)). This pressing increases the watertightness, so it is possible to reliably prevent water leakage from between the pipe body 1 and the joint ring 3.

Finally, the hexagonal bolt 20a is inserted through the through hole 21 formed in the second flange 18 of the collar 3 into the through hole 28 formed in the connecting collar 8, and the nut 20b is screwed into the opposite side of the connecting collar 8 to fasten the connecting member 20, thereby connecting the collar 3 and the connecting collar 8 (connecting step). A ring-shaped watertight member 29 is sandwiched between the second flange 18 of the collar 3 and the flange 27 of the connecting collar 8, and this watertight member 29 ensures watertightness between the two flanges 18, 27 (see FIG. 2(e)).

When a pull-out force (force in the direction indicated by the white arrow in FIG. 3) acts on the pipe body 1 provided with the anti-detachment joint, as shown in FIG. 3, the pipe body 1 slides in the direction of the force relative to the anti-detachment joint, and the first stopper portion 6 and the second stopper portion 7 come into contact. This contact prevents the pipe body 1 from sliding and prevents it from coming out. At this time, the first stopper portion 6 and the second stopper portion 7 come into contact via the laminated portion 25, so that problems such as cracks caused by the two stopper portions 6 and 7 coming into direct and strong contact with each other can be prevented. In addition, because the second stopper portion 7 and the outer circumferential surface of the pipe body 1 are covered with the continuous laminated portion 25, the second stopper portion 7 can be prevented from falling off the outer circumferential surface of the pipe body 1 due to its contact with the first stopper portion 6.

In addition, this anti-detachment structure can ensure a very large extension length, from the maximum length state in which adjacent pipe bodies 1 are farthest apart and both second stopper portions 7 attached to both pipe bodies 1 abut against the first stopper portion 6 as shown in Figure 4(a), to the minimum length state in which adjacent pipe bodies 1 abut at their insertion ports as shown in Figure 4(b). Therefore, even if the pipeline expands or contracts significantly during an earthquake, it is possible to reliably prevent the pipe bodies 1 from becoming detached.

The anti-detachment joint, anti-detachment structure, and construction method of the anti-detachment structure for the pipe body 1 described in the above embodiment are merely examples, and the shape, arrangement, number, material, etc. of the constituent members can be changed as appropriate as long as the problem of the present invention, which is to improve the durability of the retaining member and water-stopping member 5 provided between the pipe body 1 and the joint ring 3 and to improve the anti-detachment and water-stopping functions of the pipe body 1, can be solved.

1 Pipe body 2 Press ring 3 Joint ring 4 Fastening member 4a T-bolt 4b Nut 5 Water-stopping member 6 First stopper portion 7 Second stopper portion 8 Connecting joint ring 9 Circumferential groove 10 Pin hole 11, 12 Through hole (formed in press ring) 13 Tapered surface 14, 19, 21 Through hole (formed in joint ring) 15 Step portion 16 Screw hole 17 First flange 18 Second flange 20 Connecting member 20a Hexagonal bolt 20b Nut 22 Circular arc surface 23 Hexagonal bolt 24 Pin 25 Lamination portion 26, 28 Through hole (formed in connecting joint ring) 27 Flange 29 Watertight member

Claims (5)

A tube body (1) made of a resin material;
A press ring (2) is inserted into the outer peripheral surface side of the insertion port of the tube body (1);
A joint ring (3) is inserted coaxially with the press ring (2) on the outer peripheral surface side of the insertion port;
A fastening member (4) that fastens the pressing ring (2) and the joint ring (3) together;
a ring-shaped water-stopping member (5) that is interposed between the pressing ring (2) and the joint ring (3) and is pressed against the outer circumferential surface of the pipe body (1) by fastening the fastening member (4);
A first stopper portion (6) provided on the joint ring (3);
a second stopper portion (7) attached to the outer peripheral surface of the tube body (1) and abutting against the first stopper portion (6) to prevent the tube body (1) from coming off when a pulling force is applied to the tube body (1);
having
The first stopper portion (6) is composed of a ring-shaped member or a block-shaped member, and is fixed by a bolt (23) to a step portion (15) formed on the inner surface side of the joint ring (3) facing the second stopper portion (7). This is a pipe body separation prevention joint. The pipe separation prevention joint according to claim 1, wherein the first stopper portion (6) and the second stopper portion (7) are made of a rigid body. The anti-detachment joint for a pipe body according to claim 2, in which a laminated portion (25) containing a resin that covers the surface of the second stopper portion (7) and the outer peripheral surface of the pipe body (1) around the second stopper portion (7) is provided. The pipe body separation prevention joint according to any one of claims 1 to 3, which is attached to the insertion openings of a plurality of pipe bodies (1) arranged adjacent to each other along the axial direction so as to face each other,
A connecting ring (8) that connects the end portions of the anti-detachment joints of the pipes on the insertion side,
A structure for preventing a tube from coming off. an insertion step of inserting a pressure ring (2), a ring-shaped water-stopping member (5), and a joint ring (3) in this order on the outer peripheral surface side of an insertion port of a pipe body (1) made of a resin material;
a mounting process for mounting a second stopper portion (7) on the outer circumferential surface of the pipe body (1), the second stopper portion (7) being separate from the pipe body (1) and abutting against a first stopper portion (6) provided on the joint ring (3) to prevent the pipe body (1) from coming off when a pulling force is applied to the pipe body (1);
a fastening process in which the pressure ring (2) and the joint ring (3) are fastened together with a fastening member (4) and a ring-shaped water-stopping member (5) interposed between the pressure ring (2) and the joint ring (3) is pressed against the outer circumferential surface of the pipe body (1) by fastening the fastening member (4);
a connecting step of connecting the joint rings (3) attached to the insertion openings of the plurality of pipe bodies (1) arranged adjacent to each other along the axial direction with a connecting joint ring (8);
A method for constructing a structure to prevent a pipe body from coming off.

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