JP2023079955A - Branch pipe joint - Google Patents

Abstract

To provide a branch pipe joint that is used at a connection part between a main pipe and an attaching pipe, and can prevent breakage of a component with flexibility even if an inner pressure of the main body becomes high.SOLUTION: A branch pipe joint connecting a main pipe P and an attaching pipe B is equipped with a body 11, a socket 37, a flexible pipe 35, and a protector 41. The body 11 is fixed to a side peripheral surface of the main pipe P. The socket 37 has a cylindrical shape into which the attaching pipe B is inserted, and the flexible pipe 35 is a channel having flexibility capable of absorbing displacement of the main pipe P and the attaching pipe B, and is adjacent to the socket 37. The protector 41 has an annular shape surrounding the side peripheral surface of the flexible cylinder 35, and restrains expansion of the flexible cylinder 35. Therefore, even if an inner pressure of the main pipe P becomes high, the flexible cylinder 35 can be prevented from strongly contacting with a peripheral subsoil, and the breakage thereof can be avoided. By making the protector 41 in a dividable structure, workability at constructing is improved, and manufacturing cost can be suppressed.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a branch pipe joint used at a connection point between a main pipe having a large cross section and a mounting pipe having a small cross section in an irrigation channel, a sewage system, or the like.

Irrigation canals and sewage systems are social infrastructure essential to people's lives. Attachment pipes extending from homes are connected. On the other hand, although irrigation canals often have open channels, underdrains and pipes may be used for safety reasons. Thus, when an irrigation channel, a sewage system, or the like is composed of a main pipe and an attachment pipe, the two may be connected via some kind of branch joint in order to prevent water leakage at the connection point.

Regarding branch pipe joints, various technical developments are underway from the viewpoint of reliability, workability, and the like. This document discloses a "mounting pipe connection joint" capable of simplifying the connection work of the mounting pipe. Among them, the joint main body has a cylindrical shape arranged to connect the main pipe (main pipe) and the attachment pipe, and has a male threaded portion formed on its outer peripheral surface.

Next, the fitting body has a cylindrical shape surrounding the joint body, and one end side of the fitting body is placed on the outer periphery of the body pipe via a pressing member and packing, and the inner peripheral surface of the fitting body has a female thread portion that is screwed with the male thread portion. is formed. The locking means has an L-shape composed of an upper arm portion and a lower locking claw portion. can enter the interior of the main tube through the connecting port of the main tube. Therefore, during construction, when the engaging claw portion is inserted into the main pipe and the fitted body is placed on the outer periphery of the main pipe, and then the fitted body is rotated, the engaging claw is engaged by the male thread portion and the female thread portion. The part is pulled up, the main tube is sandwiched between the locking means and the packing, and the connecting joint is fixed to the main tube.

In the joint body of Patent Document 1, a cylindrical rubber packing is incorporated on the opposite side of the main tube, and the rubber packing is attached by inserting the mounting tube into the inner peripheral surface of the joint body and then tightening the mounting band. Adhere to the tube. The rubber packing is easily deformable, and has various advantages such as being able to absorb misalignment between the main pipe and the attachment pipe, and also being able to prevent the attachment pipe from coming off even in the event of an earthquake. Therefore, in recent years, branch joints having such a configuration are often introduced.

JP-A-8-14467

In irrigation canals and sewers, the main pipe is often sloped so that the water naturally flows down, and the internal pressure of the main pipe does not increase. However, depending on the topography, a pumping station may be installed on the way, and the internal pressure may increase there. Also, when the flow rate changes greatly in a short period of time due to the opening or closing of the gate, the internal pressure may rise temporarily. In this way, if the internal pressure of the main pipe suddenly rises for some reason, the parts that make up the branch pipe joint are greatly deformed, which may lead to water leakage or dropout of the attachment pipe.

As for the branch joint, a flexible part made of rubber or the like may be incorporated as in Patent Document 1 described above. If for some reason the internal pressure of the main pipe rises, this part expands and comes into intense contact with the surrounding ground. Damage to parts progresses, and there is a risk of eventually causing problems such as water leakage. Therefore, in order to prevent this damage, it is necessary to take some countermeasures at the construction stage, and it is desirable that these countermeasures be low in cost and excellent in workability.

The present invention was developed based on these circumstances, and it is used at the connection point between the main pipe and the mounting pipe, and even if the internal pressure of the main pipe increases, damage to the flexible parts can be prevented. The purpose is to provide a branch pipe joint that can be

A first aspect of the invention for solving the above-mentioned problems is a branch pipe joint used for connecting a main pipe and a mounting pipe branching from the main pipe, comprising a main body, a socket and a flexible tube. and a protector, wherein the main body is fixed to the side peripheral surface of the main pipe, the receptacle is cylindrical into which the mounting pipe is inserted, and the flexible pipe is attached to the main pipe and the attachment pipe, and is adjacent to the receptacle. It is characterized by restraining the expansion of the cylinder.

A branch pipe joint according to the present invention is designed to cope with an increase in internal pressure, and is composed of a main body, a socket, a flexible tube, a protector, and the like. is. Also, the socket is a tubular portion into which the mounting pipe can be fitted. The flexible tube is a cylindrical part that protrudes from the main body, is connected to the socket, and functions as a flow path between the main pipe and the attachment pipe. play a role in absorbing

There are various methods of fixing the main body to the main pipe, and specific examples include contacting the inner peripheral surface of the main pipe with a claw-shaped object and using this to bring the main body into close contact with the main pipe. For example, a belt is wrapped around the pipe and the main body is fixed with this belt, or a ring or the like is adhered to the inner peripheral surface of the mounting hole of the main pipe and the main body is fixed via this ring. By securing the body to the mains in this manner, water passes through the interior of the body without leakage.

The flexible tube is formed by molding a flexible material such as rubber or soft resin into a tubular shape, and is arranged between the main body and the receptacle. Therefore, one end of the flexible tube is connected to the main body in a watertight manner, and the other end is connected to the receptacle. The elastic deformation of the flexible tube makes it possible to freely adjust the angle of intersection between the main pipe and the attachment pipe during construction. If they do occur, they can be absorbed without difficulty. The flexible tube and socket are often integrally formed.

The protector has a tubular shape that covers the side peripheral surface of the flexible tube, and plays a role in pushing back the flexible tube when the flexible tube expands due to an increase in internal pressure. For this reason, protective equipment must be made of metal or other materials, and must be strong enough to withstand the load transmitted from the flexible tube. However, the flexible tube must allow some degree of deformation due to its intended use, and the shape of the protector should be designed in anticipation of this.

In this way, the branch joint is composed of the main body, the socket, the flexible tube, and the protective equipment. , the expansion of the flexible tube is restrained by the protector. Therefore, it is possible to prevent the flexible tube from coming into intense contact with the surrounding ground, and avoid damage to the flexible tube.

The invention according to claim 2 relates to the configuration of the protector, and is characterized in that the protector can be divided into a plurality of parts. By adopting a divided structure for the protective device, after arranging the protective device so as to surround the flexible tube, they are integrated to complete the assembly. By dividing the protective device in this way, there is no need to incorporate the protective device before connecting the attachment pipe, and workability is excellent. Moreover, since the protector is completed only by deforming the metal plate, the manufacturing cost can be suppressed. It should be noted that the method of integrating the divided protectors can be freely selected, such as bolting.

As in the first aspect of the invention, in a branch pipe joint provided with a flexible tube capable of absorbing displacement between the main pipe and the attachment pipe, by incorporating a protector so as to surround the side peripheral surface of the flexible tube, Expansion of the flexible tube is restrained by protective equipment. Therefore, even if the internal pressure of the main pipe becomes high, the flexible tube can be prevented from coming into heavy contact with the surrounding ground, and damage can be avoided.

By making the protective device dividable as in the second aspect of the invention, the protective device can be assembled after connecting the mounting pipe to the branch joint during construction, resulting in excellent workability. In addition, since the manufacturing process is completed only by press working or drilling the metal plate, the cost does not increase.

1 is a perspective view showing a configuration example of a branch joint according to the present invention; FIG. FIG. 2 is a perspective view showing the internal structure of the branch joint of FIG. 1; It is a perspective view which shows the state which fixed the main body to the main pipe. FIG. 10 is a perspective view showing a stage of assembling protective equipment after finishing the connection between the main pipe and the attachment pipe; FIG. 5 is a perspective view after FIG. 4 , showing a stage after assembling the protector;

FIG. 1 shows a configuration example of a branch joint according to the present invention. The branch joint is used to connect the main pipe P and the attachment pipe B, but this drawing shows the state before the branch joint is brought into contact with the main pipe P. As shown in FIG. The main pipe P at the bottom of the figure is a large-diameter pipe that is assumed to be used on a trunk line, and is buried underground. It is a small-diameter pipe, and for connection with this mounting pipe B, the main pipe P is machined with a circular mounting hole H. Although only the upper half of the main pipe P in the drawing is drawn for the sake of space, it actually has a circular cross section.

The branch pipe joint shown in this figure is roughly divided into a main body 11, a locking device 21, a connecting device 31 and a protective device 41. Among them, the main body 11 is a pedestal portion fixed to the side peripheral surface of the main pipe P. , a skirt 13, an outer cylinder 14, a sleeve 17, and the like, and water flows inside. The skirt 13 has an arcuate shape corresponding to the side peripheral surface of the main pipe P, and contacts the main pipe P without gaps to stabilize the posture of the branch pipe joint. Further, the outer cylinder 14 is arranged so as to surround the mounting hole H and functions as a base portion of the mounting pipe B. As shown in FIG.

The connector 31 serves to connect the main body 11 and the attachment pipe B, and is integrally formed of a material such as rubber. It is easily elastically deformed by an external force. The receptacle 37 is located on the upper end side of the branch joint, and is a part responsible for connection with the mounting pipe B. After inserting the tube B, a fastening band 39 is incorporated so as to surround the socket 37 and tightened so that the mounting tube B cannot be separated from the socket 37.例文帳に追加

The flexible tube 35 is a portion formed in a bellows shape, is adjacent to the receiving port 37, and plays a role of absorbing displacement between the main pipe P and the attachment pipe B. As shown in FIG. Therefore, the thickness of the flexible tube 35 is suppressed, and when the internal pressure increases, the flexible tube 35 expands outward. Also, the flexible tube 35 has a certain degree of extension in order to fulfill its role. Annular projections 34 and 36 are provided above and below the flexible tube 35 . The ridges 34 and 36 play a role of partitioning the flexible tube 35 and other areas, and have a diameter larger than that of the flexible tube 35 . In addition, the lower end of the connector 31 is fitted into the main body 11, and a fastening band 39 is also incorporated here to prevent separation from the main body 11. As shown in FIG.

The locking tool 21 plays a role of fixing the main body 11 to the main pipe P, and its lower end side enters the inside of the main pipe P through the mounting hole H. In addition, in the main body 11, the sleeve 17 located above the outer cylinder 14 is rotatable with respect to the outer cylinder 14, and by turning the handle 18 projecting from the sleeve 17, the locking tool 21 is pulled up. It has become. Therefore, when the locking device 21 is actually pulled up, the main pipe P is sandwiched between the locking device 21 and the skirt 13, and the main body 11 is fixed to the main pipe P.

The protector 41 is a metal part that surrounds the side peripheral surface of the flexible tube 35 and plays a role of restraining the expansion of the flexible tube 35 . The protector 41 shown in this figure has a half-split shape instead of a ring shape, and each protector 41 is composed of a restraining belt 45 and a flange 43 . Among them, the restraining belt 45 has a semi-circular shape slightly larger in diameter than the flexible tube 35 and its width (vertical direction in the drawing) is matched to the extension of the flexible tube 35 . A flat flange 43 is provided at both ends of the restraint band 45, and a round hole 44 is formed in the vicinity of the center thereof. Then, the flanges 43 of the opposing protectors 41 are brought into contact with each other, the round holes 44 are aligned concentrically, and the bolt 48 is inserted therein. When the bolts 48 and nuts 49 are finally tightened, the flanges 43 are brought into close contact with each other, and the flexible tube 35 is surrounded by the protector 41 without interruption. The protector 41 shown in this figure has a simple shape and can be completed only by bending and drilling a metal plate.

FIG. 2 shows the internal structure of the branch joint of FIG. The main body 11 is composed of a skirt 13, an outer cylinder 14, an inner cylinder 15, and a sleeve 17. The skirt 13 is arcuate in contact with the side peripheral surface of the main pipe P, and is arranged so as to block the mounting hole H. . The outer cylinder 14 is formed integrally with the skirt 13 and arranged so as to surround the mounting hole H. As shown in FIG. Further, an inner cylinder 15 is incorporated inside the outer cylinder 14, and water passes through the inner cylinder 15. - 特許庁The inner cylinder 15 is vertically displaceable with respect to the outer cylinder 14 .

The sleeve 17 has an annular shape placed on the outer cylinder 14 and is rotatable with respect to the outer cylinder 14. Considering the case where the sleeve 17 is actually rotated, a plate-shaped handle 18 is formed from the side peripheral surface thereof. stands out. The inner cylinder 15 is fitted into the inner peripheral surface of the sleeve 17, and a threaded portion 16 is formed at the boundary between the two. The threaded portion 16 is composed of a male thread on the inner cylinder 15 side and a female thread on the sleeve 17 side. By rotating the sleeve 17, the inner cylinder 15 is vertically displaced. The sleeve 17 is rotatable with respect to the outer cylinder 14, but is structured so as not to be separated from the outer cylinder 14. As shown in FIG.

The connector 31 is made of rubber, and is formed by integrally molding a bottom port 33 , a flexible tube 35 , a receiving port 37 , and ridges 34 and 36 . be In order to prevent the connector 31 from coming off at this location, a fastening band 39 is incorporated as shown in FIG. The flexible tube 35 is formed in a bellows shape and can be freely deformed within a certain range. In addition, the receptacle 37 is provided with a step on its inner peripheral surface so that the mounting pipe B can be properly inserted, and the end face of the mounting pipe B is brought into contact therewith.

Two locking devices 21 are arranged across the center of the mounting hole H. Each locking device 21 is composed of a head 25, an arm 24, and a claw 23. On the other hand, it is attached in a swingable state. The head 25 of the locking tool 21 is a part with a slightly increased thickness, and by fitting into the inner peripheral surface of the inner cylinder 15, the inner cylinder 15 and the locking tool 21 are firmly integrated. Further, the claw 23 enters the inside of the main pipe P through the mounting hole H, and further displaces the claw 23 to the outside of the mounting hole H, so that the main body 11 can be pulled toward the main pipe P. In addition, the arm 24 connects the head 25 and the claw 23 and has the role of allowing the claw 23 to reach the inside of the main pipe P. The head 25 is attached to the inner cylinder 15 so as to be able to swing. When the insertion is completed, the locking tool 21 is returned to its original state, and the claw 23 is displaced to the outside of the mounting hole H.

FIG. 3 shows the main body 11 fixed to the main pipe P. As shown in FIG. As shown in FIG. 2, the skirt 13 is brought into contact with the main pipe P with the locking device 21 tilted inward, and then the locking device 21 is erected. It is displaced outside the hole H. At this stage, the skirt 13 is only in contact with the main pipe P. After that, when the sleeve 17 is rotated via the handle 18, the inner cylinder 15 is displaced upward, and the claw 23 is pulled up together with this. . Therefore, the main pipe P is sandwiched between the claw 23 and the skirt 13, and the branch pipe joint is fixed to the main pipe P. Thereafter, when the attachment pipe B is inserted into the socket 37 and fixed with the fastening band 39, the connection between the main pipe P and the attachment pipe B is completed. Since the head 25 of the locking tool 21 is fitted into the inner peripheral surface of the inner cylinder 15 , the locking tool 21 is displaced integrally with the inner cylinder 15 .

FIG. 4 shows the stage of assembling the protector 41 after the connection between the main pipe P and the attachment pipe B is completed. As shown in FIG. 3, after fixing the branch joint to the main pipe P and connecting the main pipe P and the mounting pipe B, as shown in this figure, two protectors are attached so as to sandwich the flexible tube 35. 41 are arranged opposite to each other and brought close to each other so that the flanges 43 on both sides come into contact with each other. At this time, the protector 41 is sandwiched between the upper and lower protruding strips 34 and 36 and cannot be removed from the flexible tube 35 . Therefore, it is not necessary to bring the protector 41 into close contact with the flexible tube 35, and a certain amount of clearance can be secured, so that deformation of the flexible tube 35 is not hindered. As a result, even after the protector 41 is installed, the crossing angle between the main pipe P and the mounting pipe B can be freely adjusted, and displacement between the main pipe P and the mounting pipe B can be absorbed.

FIG. 5 shows the stage after FIG. 4 at which the protector 41 has been installed. After the flanges 43 of the opposing protectors 41 are brought into contact with each other, a bolt 48 is inserted so as to pierce the flanges, and a nut 49 is screwed onto the tip of the bolt 48. When these are tightened, the flexible tube 35 is cut off. It will be in a state surrounded by the protector 41. Therefore, even if the internal pressure rises for some reason and the flexible tube 35 expands, this is restrained by the protector 41 and the flexible tube 35 is prevented from coming into heavy contact with the surrounding ground. In this figure, the mounting pipe B is upright, but there is no problem even if the mounting pipe B is tilted to some extent due to elastic deformation of the flexible tube 35. A certain amount of margin is secured between the tube 35 and the tube 35 .

The present invention is characterized in that the flexible tube 35 of the branch pipe joint is surrounded by the protector 41, and the specific configuration of the branch pipe joint can be freely selected. The branch joint shown in the series of figures is therefore only an example. However, it is assumed that the branch joint always has a flexible tube 35 made of rubber or the like.

11 Body 13 Skirt 14 Outer cylinder 15 Inner cylinder 16 Threaded portion 17 Sleeve 18 Handle 21 Locking device 23 Claw 24 Arm 25 Head 31 Connecting device 33 Bottom port 34 Projection (lower side in the drawing)
35 Flexible tube 36 Projection (upper side in the figure)
37 socket 39 fastening band 41 protector 43 collar 44 round hole 45 restraint band 48 bolt 49 nut B mounting pipe H mounting hole P main pipe

Claims (2)

A branch pipe joint used to connect a main pipe (P) and a mounting pipe (B) branching from the main pipe (P), comprising a main body (11), a socket (37) and a flexible tube ( 35) and protective equipment (41),
The main body (11) is fixed to the side peripheral surface of the main pipe (P), the receptacle (37) is cylindrical into which the mounting pipe (B) is inserted, and the flexible pipe (35 ) is a flexible flow path capable of absorbing the displacement of the main pipe (P) and the attachment pipe (B) and is adjacent to the socket (37),
A branch pipe joint characterized in that the protector (41) has a ring shape surrounding the side peripheral surface of the flexible tube (35) and restrains the expansion of the flexible tube (35). The branch pipe joint according to claim 1, wherein the protector (41) can be divided into a plurality of pieces.

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