JP2020158999A - Branch pipe joint - Google Patents

Abstract

To provide a branch pipe joint which is used at a connection part between a main pipe and an attached pipe, and can prevent water leakage due to withdrawal etc. of the attached pipe even when an internal pressure of the main pipe becomes high.SOLUTION: The branch pipe joint for connecting an attached pipe B to an attached hole H of a main pipe P is mainly composed of a water flow pipe 11, a rubber joint 21, a diameter enlarged ring 31, and a fixture 41. The water flow pipe 11 is connected to the attached pipe B via a connector 12. Further, the rubber joint 21 has a shape in which a neck part 23 and a skirt part 25 are connected by a conical trunk part 24, the neck 23 is brought into close contact with the water flow pipe 11 by the rubber joint, the skirt part 25 is fitted into the attached hole H, the diameter enlarged ring 31 and the fixture 41 are incorporated into an inner peripheral surface of the skirt part 25, and the skirt part 25 is in close contact with the attached hole H. The branch pipe joint is prevented from coming off from the attached hole H by providing the fixture 41 with a stop part 45 that protrudes outward from the attached hole H and faces the inner peripheral surface of the main pipe P. Further, the attached pipe B can be prevented from coming off by providing a stopper 13 on the water flow pipe 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a branch pipe joint used at a connection portion between a main pipe having a large cross section and a mounting pipe having a small cross section in an irrigation canal, a sewer, or the like.

The irrigation canal plays the role of supplying water to farmland and factories, and the sewer plays the role of collecting sewage and detoxifying it. Of these, the sewer is to be opened from the viewpoint of hygiene. There is no such thing, and a main pipe with a large cross section is embedded in the ground, and a mounting pipe extending from home is connected to it. On the other hand, although many irrigation canals are open culverts, culverts and pipes may be used from the viewpoint of safety, etc. For this pipe, a main pipe with a large cross section is embedded and a mounting pipe with a small cross section is embedded there. May be used to connect. In this way, when an irrigation canal or a sewer is composed of a main pipe and a mounting pipe, some kind of branch pipe joint is often incorporated in the connection portion to prevent water leakage.

Regarding the branch pipe joint, technological development for improving reliability and workability is underway, and Patent Document 1 described later is given as an example. This document discloses a connection structure that prevents the mounting pipe from being pushed out in the axial direction due to an impact load due to the passage of a vehicle, earth pressure, an earthquake, or the like, and protruding into the main pipe. As described in this document, if the mounting pipe actually protrudes inside the main pipe, the flow of the main pipe is obstructed, causing problems such as a decrease in flow rate and retention of foreign matter, and mounting. The pipe may be cut off in the middle.

Patent Document 1 is characterized in that a cage-shaped leg is incorporated in the outer peripheral surface of the mounting tube in order to prevent this protrusion, and one end side of the leg is in contact with a socket concentrically aligned with the mounting tube. The other end of the leg is in contact with the outer peripheral surface of the main pipe. As a result, the load acting on the mounting pipe is received by the main pipe via the leg body, and the displacement of the mounting pipe is regulated, so that the protrusion can be prevented.

Japanese Unexamined Patent Publication No. 2003-3557

In irrigation canals and sewers that consist of a main pipe and a mounting pipe, the main pipe is often sloped to allow water to flow down naturally, and the internal pressure of the main pipe does not increase. However, depending on the terrain, the internal pressure may increase because the pump is used on the way, and the internal pressure may increase locally due to variations in the flow rate. When the internal pressure of the main pipe becomes high in this way, the branch pipe joint incorporated in the connection part with the mounting pipe is pushed outward, and the branch pipe joint may be separated from the main pipe. There is a risk that the mounting pipe will separate from the branch joint, and water will leak into the ground from these separation points, which may cause various problems such as a decrease in flow rate and contamination of the surrounding area.

In Patent Document 1 above, by using a leg body, it is possible to prevent the attachment pipe from protruding into the main pipe. However, due to its structure, it cannot cope with the increase in the internal pressure of the main pipe. Therefore, it is necessary to prevent the branch pipe joint and the mounting pipe from coming off by using a means different from that of Patent Document 1 in a place where an increase in internal pressure is expected.

The present invention has been developed based on such a situation, and is used at the connection portion between the main pipe and the mounting pipe, and can prevent water leakage due to disconnection of the mounting pipe even when the internal pressure of the main pipe becomes high. It is intended to be provided.

The invention according to claim 1 for solving the above-mentioned problems is a branch pipe joint used at a connecting portion between a main pipe and a mounting pipe, and the main pipe has a mounting hole for connecting to the mounting pipe. A water passage pipe connected to the mounting pipe via a connector, a tubular rubber joint surrounding the water passage pipe, a diameter expansion ring incorporated inside the rubber joint, and a diameter expansion ring. The rubber joint is composed of a fixture to be incorporated inside, and the rubber joint has a shape in which a small-diameter neck portion and a large-diameter hem portion are connected by a conical body portion, and the hem portion is inside the mounting hole. The diameter-expanding ring and the fixture are arranged on the inner peripheral surface side of the hem portion, and the diameter-expansion ring is deformed by a push bolt inserted from the fixture toward the diameter-expansion ring. The rubber joint is brought into close contact with the inner peripheral surface of the mounting hole, the water pipe is inserted into the neck portion, the neck portion is brought into close contact with the water pipe, and the rubber joint is brought into close contact with both the mounting hole and the water pipe. This is a branch pipe joint characterized in that water leakage is prevented, and the fixture is provided with a retaining portion that protrudes outward from the mounting hole and faces the inner peripheral surface of the main pipe.

The present invention is characterized in that it has a function of preventing water leakage against an increase in internal pressure, and is mainly composed of four elements of a water pipe, a rubber joint, a diameter expansion ring, and a fixture. Of these, the water pipe functions as an extension of the mounting pipe, and extends linearly with almost the same diameter as the mounting pipe, one end of which is adjacent to the end of the mounting pipe, and the other end of which is the main pipe. It has reached the vicinity of the mounting hole of. A general-purpose connector such as a union is used to connect the mounting pipe and the water pipe, and the mounting pipe and the water pipe are substantially integrated by this connector.

The rubber joint is made of a flexible material such as rubber or soft resin molded into a conical shape, and contacts the outer peripheral surface of the water pipe and the inner peripheral surface of the mounting hole to prevent water leakage. Therefore, of both ends of the rubber joint, the end on the small diameter side is provided with a tubular neck that contacts the outer peripheral surface of the water pipe, and the opposite end on the large diameter side is inside the mounting hole. A tubular hem that contacts the peripheral surface is provided. The neck and hem are connected by a conical body. The water pipe passes through the neck and enters the body and hem.

The diameter-expanding ring is a band-shaped ring that is incorporated into the inner peripheral surface of the hem of the rubber joint, but it is not an uninterrupted ring shape, but a "C" shape with one interruption, and can be easily deformed. Therefore, when the diameter expansion ring is pushed open to the outer peripheral side, this presses the hem portion of the rubber joint from the inside, and as a result, the rubber joint is in close contact with the mounting hole, so that water leakage from the mounting hole can be prevented. The height of the expansion ring (pointing to the length in the axial direction of the water pipe) is often equal to the height of the hem.

The fixture is a component that is built into the inner peripheral side of the diameter expansion ring and is the base for expanding the diameter expansion ring. Like the diameter expansion ring, it is mainly composed of a band-shaped ring, but this is interrupted in principle. It becomes a ring that never happens. The push bolt is a bolt that is inserted from the inner peripheral side of the fixture toward the outer peripheral side, and is screwed with the fixture. Therefore, when the inserted push bolt is rotated, its tip comes into contact with the diameter-expanding ring, and when the rotation is continued, the diameter-expanding ring is expanded toward the outer circumference.

A female screw for screwing the push bolt is formed on the fixture. This female screw may be machined into a hole that penetrates the inner peripheral surface and the outer peripheral surface of the fixture, but the formation of the female screw can be omitted by welding a nut to the inner peripheral surface side of this hole. In addition, in order to exert the function normally, a plurality of push bolts are arranged at a predetermined angle for one fixture.

The water pipe is inserted into the neck of the rubber joint as described above, but the outer peripheral surface of the neck is tightened by some means in order to bring the water pipe and the neck into close contact with each other. There is no problem with this means, such as a wire number, but usually a general-purpose tightening band is used. In this way, since the rubber joint is in close contact with both the outer peripheral surface of the water pipe and the inner peripheral surface of the mounting hole, water leakage from the connection portion between the main pipe and the mounting pipe can be completely prevented.

The retaining portion is a portion that protrudes from one end side of the fixture, extends toward the center of the main pipe, further protrudes outward from the mounting hole, and faces the inner peripheral surface of the main pipe. Therefore, even when the fixture is attempted to be separated from the mounting hole, the retaining portion comes into contact with the main pipe and cannot be separated. The fixture is in close contact with the hem of the rubber joint with the diameter expansion ring in between, and the neck of the rubber joint is in close contact with the water pipe. Therefore, the fixture can prevent displacement of the water pipe and the mounting pipe.

The shape of the retaining portion is arbitrary as long as it faces the inner peripheral surface of the main pipe and the displacement of the branch pipe joint can be regulated. Specific examples of this include a form in which a plurality of parts protruding from one end side of the fixture (the side close to the center of the main pipe) like legs are provided, and a form in which a conical part is provided on one end side of the fixture. Can be mentioned. In addition, it is desirable that the retaining portion is in contact with the inner peripheral surface of the main pipe, but in consideration of workability during construction, there may be a slight gap. In the actual construction, the fixture is first brought into the main pipe and then the fixture is placed inside the mounting hole in consideration of the retaining part.

In this way, the branch pipe joint that connects the main pipe and the mounting pipe is composed of rubber joints, fixtures, etc., and the fixture is provided with a retaining portion that faces the inner peripheral surface of the main pipe. Even when the internal pressure rises and a load that pushes out the mounting pipe is generated, the retaining portion comes into contact with the inner peripheral surface of the main pipe and receives this load. Therefore, it is possible to prevent the branch pipe joint from being separated from the main pipe, and it is also possible to prevent water from leaking out. In the present invention, the detailed configuration of the branch pipe joint is flexible, and as in Patent Document 1 described above, a means for preventing the water pipe from protruding into the main pipe can be incorporated.

The invention according to claim 2 is for preventing the water pipe from coming off, and in order to regulate the displacement between the neck and the water pipe, the outer peripheral surface of the water pipe is provided with a stopper protruding outward. It is a feature. The water pipe is a simple tubular shape, but the stopper is a part that protrudes from the outer peripheral surface thereof, and is arranged inside the body of the rubber joint under normal conditions. The stopper may be a local protrusion, but may also have a flange shape without interruption.

The rubber joint cannot be separated from the main pipe by the retaining portion according to claim 1. However, the water pipe is held only by friction with the neck of the rubber joint, and when an excessive load is applied, slippage occurs on this contact surface, and it is expected that only the water pipe will come off. Therefore, by providing the stopper as in the present invention, even if slippage occurs, the stopper eventually comes into contact with the neck portion, further displacement becomes impossible, and the water pipe can be prevented from coming off. Since a tightening band or the like is incorporated in the neck, it cannot bulge outward. As a result, the stopper cannot pass through the neck.

The invention according to claim 3 is for protecting the rubber joint, and a conical pressing collar is fitted on the outer peripheral surface of the body of the rubber joint in order to prevent expansion due to an increase in internal pressure. It is a feature. Since the rubber joint has flexibility, it may expand outward due to an increase in internal pressure and be pressed against the surrounding ground or the like to be damaged. In order to avoid such a situation, a pressing collar that covers the body of the rubber joint may be used.

The pressing collar has a conical shape corresponding to the body of the rubber joint, and is finished in a size that allows surface contact with the outer peripheral surface of the body under normal conditions. Further, if the pressing collar is displaced in the axial direction, it will be separated from the rubber joint. Therefore, the pressing collar may come into contact with peripheral parts to regulate displacement. The pressing collar may cover the entire body or may be limited to the intermediate portion where large expansion is expected.

As in the invention according to claim 1, the branch pipe joint for connecting the main pipe and the mounting pipe is mainly composed of four elements of a water pipe, a rubber joint, a diameter expansion ring and a fixture, and the fixture is a main pipe. By providing a retaining portion facing the inner peripheral surface of the pipe, it is possible to regulate the displacement that separates the branch pipe joint from the main pipe. Therefore, even if the internal pressure of the main pipe rises and a load that pushes the branch pipe joint to the outside is generated, the branch pipe joint does not separate from the main pipe, and water leakage can be prevented.

As in the invention of claim 2, by providing a stopper protruding outward on the outer peripheral surface of the water pipe, the stopper comes into contact with the neck of the rubber joint even when the internal pressure rises, and the water pipe becomes a rubber joint. It is possible to prevent the water from leaking from the water. The water pipe is integrated with the mounting pipe via a connector. Therefore, in the present invention, it is possible to prevent the mounting pipe from being separated from the branch pipe joint.

As in the invention of claim 3, by fitting a conical pressing collar on the outer peripheral surface of the body of the rubber joint, expansion of the rubber joint can be suppressed even when the internal pressure rises. As a result, the rubber joint is not pressed against the ground and damage can be prevented, so that reliability is improved.

Although it is a perspective view showing a structural example of a branch pipe joint according to the present invention, its components are drawn separately. The rubber joint and the pressing collar are split in half to show the structure. In the perspective view showing the relationship between the rubber joint, the diameter-expanding ring, and the fixture in FIG. 1, the arrangement of the diameter-expanding ring and the fixture is drawn in the upper part of the figure, and the diameter-expanding ring The state where the fixture is incorporated inside the rubber joint is drawn. The rubber joint is split in half. It is a perspective view showing the process of attaching the rubber joint of FIG. 1 to the main pipe, and the upper part of the figure shows how the rubber joint is brought into close contact with the mounting hole, and the lower part of the figure shows how the pressing collar is fitted. Etc. are drawn. The rubber joint and the pressing collar are halved. After FIG. 3, it is a perspective view showing a process of incorporating a water pipe or the like into a rubber joint. The rubber joint and the pressing collar are halved. In the perspective view showing the final stage after FIG. 4, a water pipe is inserted into the rubber joint so that the lower end of the water pipe reaches the vicinity of the mounting hole. The rubber joint and the pressing collar are halved. It is a perspective view which shows the state which incorporated the branch pipe joint of FIG. 1 into a main pipe.

FIG. 1 shows a structural example of a branch pipe joint according to the present invention. The branch pipe joint is used at the connection portion between the main pipe P and the mounting pipe B, but in this figure, the components thereof are drawn in a separated state. The main pipe P is a large-diameter pipe that is supposed to be used on a trunk line and is embedded in the ground, and the mounting pipe B is a small-diameter pipe that becomes a branch line connecting the main pipe P and a household. A circular mounting hole H is machined in the main pipe P for connection with the mounting pipe B. The main pipe P in the drawing is drawn only around the mounting hole H.

The branch joint in this figure is mainly composed of a water pipe 11, a rubber joint 21, a diameter-expanding ring 31, a fixture 41, and an outer leg 51. Among them, the water pipe 11 has a cylindrical shape made of synthetic resin and functions as an extension of the mounting pipe B, so that it has the same cross section as the mounting pipe B. Further, the water pipe B is located on one end side of the water pipe 11. A connector 12 is incorporated for connection with. The connector 12 here is a general-purpose product called a spherical joint or the like, and has a structure in which two spherical parts inside and outside are in surface contact with each other, of which the outer side is integrated with the water pipe 11 and the inner side. Can be inserted into the mounting pipe B without a gap, and can swing freely within a predetermined range, and can be connected without difficulty even when the mounting pipe B and the water pipe 11 have an angle of intersection. It should be noted that the connector 12 incorporates a packing or the like so that water does not leak from the packing, and the connector 12 firmly integrates the attachment pipe B and the water pipe 11. As a matter of course, the connector 12 is not limited to the one shown in the figure, and can be freely selected according to the situation of the construction site and the like.

The outer leg 51 is a basket-shaped part that surrounds the water pipe 11, has a role of preventing the water pipe 11 from protruding toward the center of the main pipe P, and the tubular portion 53 and the contact ring 55 are attached by the arm 54. It is a tied structure. The tubular portion 53 has a simple annular shape and has an inner diameter into which the water pipe 11 can be inserted without loosening. The contact ring 55 has a larger diameter than the tubular portion 53 and surrounds the mounting hole H while surrounding the outer circumference of the main pipe P. It comes into contact with the surface, and the tubular portion 53 and the contact ring 55 are integrated by a total of four arms 54. Then, when the water pipe 11 is inserted into the tubular portion 53, the connector 12 eventually comes into contact with the tubular portion 53, and the outer leg tool 51 is fixed.

The rubber joint 21 is literally a flexible part formed of rubber or the like, and is in close contact with both the outer peripheral surface of the water pipe 11 and the inner peripheral surface of the mounting hole H to prevent water leakage. Therefore, the rubber joint 21 has a conical shape, and a neck portion 23 that contacts the outer peripheral surface of the water pipe 11 is provided at the end portion on the small diameter side, and the inner circumference of the mounting hole H is provided at the end portion on the large diameter side. A hem portion 25 that comes into contact with the surface is provided, and a conical body portion 24 is connected between the neck portion 23 and the hem portion 25. Further, on the outer peripheral surface of the hem portion 25, two rows of lips 27 protruding in an annular shape are provided, and the outer peripheral surface of the lips 27 comes into contact with the mounting hole H. The specific contact method between the hem portion 25 and the mounting hole H is flexible, and such a lip 27 may not be provided. In addition, a brim 26 projecting in the central direction is provided at the end of the hem portion 25.

The pressing collar 29 is for restricting deformation of the rubber joint 21, has a conical shape that contacts the outer peripheral surface of the body portion 24 of the rubber joint 21, and is made of metal for that purpose. In addition, after inserting the water pipe 11 into the neck portion 23 of the rubber joint 21, a tightening band 19 is used in order to bring the neck portion 23 into close contact with the water pipe 11. By actually tightening the tightening band 19, the rubber joint 21 comes into close contact with the water pipe 11 and prevents water leakage from here.

The diameter-expanding ring 31 is formed by deforming a strip-shaped metal plate into an annular shape, but it is not an uninterrupted annular shape, but has a "C" shape in which one portion is interrupted, and can be easily deformed in the inward and outward directions. The diameter expansion ring 31 is incorporated on the inner peripheral side of the hem portion 25 of the rubber joint 21 and rests on the upper surface of the brim 26. Therefore, the diameter-expanding ring 31 and the hem portion 25 have the same height (pointing to the length in the axial direction of the water pipe 11). The outer diameter of the enlarged diameter ring 31 is slightly smaller than the inner diameter of the hem 25, and when both are correctly arranged, a gap is formed at the boundary between them. In addition, a rod-shaped pin 38 projects from the inner peripheral surface of the diameter expansion ring 31. Pins 38 are provided at two locations so as to face each other with the center in between.

The fixture 41 is a component incorporated on the inner peripheral side of the diameter-expanding ring 31, is configured around the annular inner ring 43, and plays a role of deforming the diameter-expanding ring 31. The inner ring 43 has an uninterrupted annular shape and is large enough to enter the inner peripheral side of the diameter-expanding ring 31. And on the inner peripheral surface of the inner ring 43, nuts 44 are attached at a total of four places at 90 degree intervals, and holes are also machined in the inner ring 43 corresponding to the nuts 44. Therefore, when the push bolt 47 is arranged inside the inner ring 43 and screwed into the nut 44, the tip portion penetrates the inner ring 43 and comes into contact with the diameter expansion ring 31, and pushes the diameter expansion ring 31 open. , The hem portion 25 of the rubber joint 21 can be brought into close contact with the inner peripheral surface of the mounting hole H.

Leg-shaped retaining portions 45 project from the lower end side of the inner ring 43 of the fixture 41. The retaining portions 45 are arranged at 90-degree intervals in a total of four locations, all of which are arranged from the middle to the outside. The protruding L-shaped circle connecting the tips of the retaining portions 45 has a diameter larger than that of the mounting hole H. Therefore, when the fixture 41 is arranged inside the mounting hole H, the retaining portion 45 comes into contact with the inner peripheral surface of the main pipe P, and the displacement of the fixture 41 can be regulated. An elongated hole 48 is formed in the inner ring 43 in order to accommodate the pin 38 of the diameter expansion ring 31. When the pin 38 is fitted into the elongated hole 48, the diameter expansion ring 31 and the fixture 41 become inseparable, but the elongated hole 48 allows some displacement.

In addition, a massive stopper 13 is attached to the outer peripheral surface of the water pipe 11. The stopper 13 has a role of regulating the displacement of the water pipe 11, and when the stopper 13 comes into contact with the neck portion 23, further displacement is regulated. The stopper 13 cannot be attached to the water pipe 11 from the beginning due to the consideration of incorporating the outer leg tool 51, and is attached with an adhesive or the like in the middle of manufacturing. Further, in FIG. 1, it is assumed that the four stoppers 13 are attached at 90-degree intervals, but the shape and arrangement thereof are flexible.

FIG. 2 shows the relationship between the rubber joint 21 of FIG. 1, the diameter-expanding ring 31, and the fixture 41, and the arrangement of the diameter-expanding ring 31 and the fixture 41 is drawn in the upper part of this figure. The diameter-expanding ring 31 is arranged so as to surround the inner ring 43 of the fixture 41. At that time, the pin 38 of the diameter-expanding ring 31 is fitted into the elongated hole 48 of the inner ring 43, and the diameter-expanding ring 31 and the fixture 41 are inserted. Prevent separation from. Further, a push bolt 47 is screwed into the nut 44 attached to the inner peripheral surface of the inner ring 43. Then, when the push bolt 47 is rotated, its tip comes into contact with the diameter expansion ring 31 and can be pushed open. In addition, the retaining portion 45 projects outward without contacting the diameter expansion ring 31.

At the bottom of FIG. 2, a state in which the diameter expansion ring 31 and the fixture 41 are incorporated inside the rubber joint 21 is drawn. The diameter-expanding ring 31 is arranged so as to be in contact with the inner peripheral surface of the hem portion 25 of the rubber joint 21, and is mounted on a brim 26 that surrounds the end portion of the hem portion 25. Therefore, the diameter expansion ring 31 and the fixture 41 are stably held inside the rubber joint 21 and are not inadvertently detached. Further, the retaining portion 45 projects outward without contacting the rubber joint 21. In addition, a conical pressing collar 29 is fitted into the body 24 of the rubber joint 21.

FIG. 3 shows a process of attaching the rubber joint 21 of FIG. 1 to the main pipe P. As shown in FIG. 2, after incorporating the diameter expansion ring 31 and the fixture 41 inside the rubber joint 21, bring these sets inside the main pipe P, and then put the neck 23 of the rubber joint 21 at the top. However, these are inserted into the mounting holes H. Then, after almost the entire hem portion 25 of the rubber joint 21 has entered the inside of the mounting hole H, the push bolt 47 is rotated by a tool such as a hexagon wrench or a ratchet wrench as shown in the upper part of FIG. The tip portion is brought into contact with the diameter expansion ring 31 and this is pushed out toward the outer periphery. As a result, a gap is created between the diameter-expanding ring 31 and the fixture 41, and the diameter-expanding ring 31 presses the hem 25, and the lip 27 comes into close contact with the inner peripheral surface of the mounting hole H to the outside of the rubber joint 21. Prevent water leakage.

After the rubber joint 21 is brought into close contact with the mounting hole H, the pressing collar 29 is fitted into the body 24 of the rubber joint 21 as shown in the lower part of FIG. 3, and the tightening band 19 is further arranged so as to surround the neck 23. .. In this state, the retaining portion 45 of the fixture 41 projects outward from the mounting hole H and faces the inner peripheral surface of the main pipe P. Therefore, even if the rubber joint 21 is to be separated from the main pipe P, the retaining portion 45 catches the rubber joint 21 and cannot separate it.

FIG. 4 shows a process of incorporating the water pipe 11 and the like into the rubber joint 21 after FIG. As shown in FIG. 3, after attaching the rubber joint 21 to the main pipe P, the water pipe 11 is inserted into the center of the rubber joint 21, and the tightening band 19 surrounding the neck 23 of the rubber joint 21 is tightened. The joint 21 is in close contact with the water pipe 11. It is necessary to incorporate the outer leg tool 51 into the water pipe 11 in advance. At that time, the tubular portion 53 of the outer leg tool 51 is brought into contact with the connector 12, and then the stopper 13 is attached to the water pipe 11. Therefore, the outer leg tool 51 cannot be separated from the water pipe 11. Then, when the water pipe 11 is inserted into the rubber joint 21, the neck portion 23 is temporarily expanded to form a gap, through which the stopper 13 is passed.

FIG. 5 shows the final stage after FIG. After FIG. 4, when the water pipe 11 is inserted into the rubber joint 21 and the lower end of the water pipe 11 reaches the vicinity of the mounting hole H, the contact ring 55 of the outer leg tool 51 contacts the outer peripheral surface of the main pipe P. However, the position of the water pipe 11 and the like is fixed. When the water pipe 11 is inserted, the stopper 13 passes through the neck portion 23 and reaches the lower side thereof. When the tightening band 19 is tightened in this state, the neck portion 23 comes into close contact with the water pipe 11 to prevent water leakage here. Further, the tightening band 19 makes the neck portion 23 indeformable, and thereafter, the stopper 13 cannot pass through the neck portion 23 and prevents the water pipe 11 from being separated from the rubber joint 21.

As shown in FIG. 5, since the retaining portion 45 faces the inner peripheral surface of the main pipe P, the rubber joint 21 does not separate from the main pipe P even when the internal pressure rises. Further, the water pipe 11 and the rubber joint 21 are integrated only by friction by the tightening band 19, and depending on the conditions, slippage may occur on both contact surfaces. However, when the stopper 13 comes into contact with the neck portion 23, further slippage is restricted and the water pipe 11 is prevented from being separated from the rubber joint 21. The water pipe 11 is integrated with the mounting pipe B via the connector 12, and the stopper 13 prevents the mounting pipe B from being separated from the branch pipe joint. In addition, the outer leg tool 51 is sandwiched between the connecting tool 12 and the main pipe P. Therefore, even when a load that pushes the water pipe 11 into the main pipe P is generated, the displacement of the water pipe 11 can be prevented.

FIG. 6 shows a state in which the branch pipe joint of FIG. 1 is incorporated in the main pipe P. The branch pipe joint is integrated with the main pipe P by a diameter expansion ring 31 and a fixture 41, and the retaining portion 45 faces the inner peripheral surface of the main pipe P. Therefore, even if the internal pressure rises, the branch pipe joint is prevented from being separated from the main pipe P, and water leakage is not caused. Further, the upstream side of the mounting pipe B is connected to a box installed in a home or the like, and the water flowing into the box reaches the main pipe P from the mounting pipe B via the branch pipe joint.

The tightening band 19 is arranged so as to be in contact with the pressing collar 29, and prevents the pressing collar 29 from rising. Therefore, even if the internal pressure rises, the pressing collar 29 is not pushed up by the rubber joint 21 and its expansion is suppressed. The branch pipe joints drawn in the drawings so far only show one form of the present invention, and the detailed shape of each part including the retaining portion 45 can be freely determined. Further, the main pipe P may have a square cross section in addition to the circular cross section. Further, it is desirable that the parts arranged adjacent to the main pipe P, such as the abutting ring 55, be curved as necessary so as to follow the cross-sectional shape of the main pipe P to reduce unnecessary gaps and the like.

11 Water pipe 12 Connector (spherical joint)
13 Stopper 19 Tightening band 21 Rubber joint 23 Neck part 24 Body part 25 Hem part 26 Brim 27 Lip 29 Press collar 31 Diameter expansion ring 38 Pin 41 Fixture 43 Inner ring 44 Nut 45 Retaining part 47 Push bolt 48 Long hole 51 Outside Legs 53 Cylinder 54 Arm 55 Abutment ring B Mounting pipe H Mounting hole P Main pipe

Claims (3)

It is a branch pipe joint used at the connection portion between the main pipe (P) and the mounting pipe (B), and the main pipe (P) is provided with a mounting hole (H) for connection with the mounting pipe (B). It is provided,
A water pipe (11) connected to the mounting pipe (B) via a connector (12), a tubular rubber joint (21) surrounding the water pipe (11), and the rubber joint (21). It is composed of a diameter-expanding ring (31) incorporated inside and a fixture (41) incorporated inside the diameter-expanding ring (31).
The rubber joint (21) has a shape in which a small-diameter neck portion (23) and a large-diameter hem portion (25) are connected by a conical body portion (24), and the hem portion (25) is the said. Fit inside the mounting hole (H),
The diameter-expanding ring (31) and the fixture (41) are arranged on the inner peripheral surface side of the hem portion (25), and a push inserted from the fixture (41) toward the diameter-expanding ring (31). By deforming the diameter expansion ring (31) with the bolt (47), the rubber joint (21) is brought into close contact with the inner peripheral surface of the mounting hole (H).
Further, the water pipe (11) is inserted into the neck portion (23), and the neck portion (23) is brought into close contact with the water pipe (11).
The rubber joint (21) is in close contact with both the mounting hole (H) and the water pipe (11) to prevent water leakage.
The fixture (41) is provided with a retaining portion (45) that protrudes outward from the mounting hole (H) and faces the inner peripheral surface of the main pipe (P). Fittings. A claim characterized in that a stopper (13) protruding outward is provided on the outer peripheral surface of the water pipe (11) in order to regulate the displacement between the neck portion (23) and the water pipe (11). Item 1. The branch pipe joint according to item 1. Claim 1 or claim 1, wherein a conical pressing collar (29) is fitted on the outer peripheral surface of the body portion (24) of the rubber joint (21) in order to prevent expansion due to an increase in internal pressure. 2. The branch pipe joint described.

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