JPH05106774A - Branch part connection joint, attached pipe and branch part connection structure - Google Patents

Abstract

PURPOSE:To provide a connection structure excellent in its water stop property and strength by providing a joint capable of being set at the connection hole of a main pipe easily and generating no reduction in the flowing down characteristic of the main pipe when it is set, and an attached pipe to the main pipe through the joint. CONSTITUTION:At one end of a joint 1 a spigot 2a formed with a slit 2c extending in the axial direction so as to be in conformity with the circumferential inner wall face of connection hole 3a of a main pipe 3. The outer dia. of the spigot 2a is made smaller than the hole dia. of the connection hole 3a while the inner dia. is made smaller than that of joint intermediate part. The joint portion to be inserted into the connection hole 3a when a joint 1 is set to the connection hole 3a is substantially made identical to the wall thickness of the circumferential pipe wall of the connection hole 3a, and the outer circumferential part is provided with a water stop member 4 sealing the part between the joint 1 and the main pipe 3. The joint 1 is then set to the main pipe connection hole 3a and an attached pipe 5 is insertion connected in the joint 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch joint for use in joining a mounting pipe to a main pipe of a sewer or the like buried in the ground so as to intersect the main pipe, a mounting pipe, and Regarding connection structure.

[0002]

2. Description of the Related Art For example, an attachment pipe is installed between a main sewer pipe pre-embedded in the ground and a house on the ground to allow waste water from the house to flow to the main sewer pipe. This type of mounting pipe is mounted so as to intersect the main pipe in the ground, and in that case, conventionally, the mounting pipe was generally laid by cutting the ground. However, in recent years, the so-called non-excavation method is often adopted because the excavation space cannot be sufficiently obtained in many cases.

In this non-open cutting method, the mounting pipe is propelled to a predetermined position and connected without cutting the ground,
At that time, there is a problem in how to smoothly propel the mounting pipe and how to secure water stopping property and strength at a branch portion between the main pipe and the mounting pipe. Therefore, in order to deal with such a problem, the following various connection technologies have been conventionally proposed.

Connection is made by injecting an epoxy adhesive into the contact portion between the main pipe and the mounting pipe and curing the same (see Japanese Patent Publication No. 50-2931). A filler such as cement milk is injected into the gap between the connection hole for the mounting pipe and the connection end of the mounting pipe in the main pipe to join them (see Japanese Patent Laid-Open No. 61-162644). A connecting portion between the main pipe and the mounting pipe is filled with a flexible adhesive to be connected (see JP-A-57-15185).

[0005] Synthetic resin pipes are inserted into the main pipe and the mounting pipe, respectively, filled with a curing agent from the mounting pipe side, and then the pipes are connected by opening holes (Japanese Patent Publication No. 61-40880). reference). A joint for joining a branch portion is inserted from the inside of the main pipe using a robot or the like (see Japanese Utility Model Laid-Open No. 61-122478).

The main pipe and the mounting pipe are connected by inserting the connecting pipe from the main pipe side and fitting them into the mounting pipe (see Japanese Patent Laid-Open No. 56-52240). A screw is cut on each of the main pipe and the connecting pipe, and the pipe is set on the main pipe from the mounting pipe side to connect the main pipe and the mounting pipe (see Japanese Patent Laid-Open No. 56-52241).

Further, the following joints have been proposed especially as a joint used at a branch portion between a main pipe and a mounting pipe. In a joint with one end serving as a receiving end and the other end serving as a spigot, an elastic locking piece is formed at the spigot, the tip of the locking piece is bent outward to provide a burr, and A collar with an outer diameter larger than the diameter of the connection hole of the main pipe is provided on the intermediate outer periphery with the inlet, and when the joint inlet is inserted into the connection hole of the main pipe, the burr of the elastic locking piece is One in which a joint is connected to the main pipe by being caught on the edge of the hole (see Japanese Utility Model Laid-Open No. 54-148931).

[0008]

However, each of the above conventional techniques has the following problems. That is, in the cases described in (1) to (4), since a step of injecting a drug or a curing agent is required when connecting the main pipe and the mounting pipe, the number of steps is increased accordingly. Further, since the strength of the connecting portion between the main pipe and the mounting pipe is substantially determined by the hardening agent or the like, for example, the hardening agent or the like in the connecting portion is cracked due to the ground displacement after the installation of the mounting pipe. In this case, there is a problem in that water stopping cannot be expected at all and water leakage occurs.

Further, in the above-mentioned, since it is necessary to insert a joint setting robot or the like into the main pipe side to operate the joint to set the joint on the pipe wall of the main pipe, the construction process is complicated and the man-hours are increased. There are some drawbacks such as increase in number. Further, in the cases described in and, there is a problem that the accuracy of the joining direction and the angle (that is, high insertion accuracy) is required at the time of joining the attachment pipes, and the construction is difficult.

On the other hand, in the joint described in (1), since the burr of the elastic locking piece is merely hooked at the hole edge of the main pipe connecting hole in the state of being set on the main pipe, the bending force acting on the joint. There is a disadvantage that it is weak against. Also, since the outer diameter of the tip of the joint, that is, the above-mentioned burr, is made larger than the hole diameter of the main connection hole so that it will be caught by the hole edge of the main connection hole, it is necessary to temporarily install it in the main connection hole. The burr must be reduced in diameter and inserted, and if the mounting position is slightly misaligned, the tip of the burr may abut the outer wall surface of the main pipe and break.

Furthermore, since the burr portion protrudes inward from the main pipe after the connection to the main pipe, there is a problem that the flow-down ability of the main pipe is lowered. The present invention addresses the above-mentioned problems in the related art, and can be set in a predetermined state even if the position is slightly displaced with respect to the connection hole of the main pipe. We will provide a joint that does not cause deterioration and a mounting pipe suitable for mounting to the main pipe through this joint, and by combining these, a connection structure of the branch part that is excellent in water stopping performance and strength etc. Aim to achieve.

[0012]

In order to achieve the above object, the invention according to claim 1 of the present application (hereinafter referred to as the first invention)
Is a branch joint for use in joining a mounting pipe to a main pipe buried in the ground so as to intersect with the main pipe, and is configured as follows. That is, an opening having a slit extending in the axial direction is provided at one end of the joint, and the tip end shape is formed so as to follow the inner wall surface shape of the peripheral portion of the connection hole of the main pipe. Then, the outer diameter of this inlet is made smaller than the hole diameter of the connection hole, and the inner diameter is set to be smaller than the inner diameter of the other end portion or the intermediate portion of the joint. Further, the length of the insertion portion that enters the connection hole when setting the joint to the main pipe connection hole is set to be substantially equal to or less than the wall thickness of the pipe wall around the connection hole in the main pipe, while the difference A water stop member is provided on the outer circumference of the mouth to seal between the joint and the main pipe when the joint is set.

The other end of the joint may or may not be provided with a receiving port for connecting a mounting pipe. The invention according to claim 2 of the present application (hereinafter referred to as the second invention) is
The attachment pipe connected to the main pipe via the joint was constructed as follows. That is, a spigot is provided at one end, and the tip of this spigot is formed into a shape that conforms to the inner wall surface shape of the main pipe connection hole peripheral portion so as not to project inward of the main pipe when attached to the main pipe, and The outer diameter of the spigot is set to be substantially equal to or slightly smaller than the inner diameter of the other end or the intermediate portion of the joint and larger than the inner diameter of the spigot.

Further, the invention according to claim 3 of the present application (hereinafter referred to as the third invention) is attached to the main pipe buried in the ground via the joint for branching part according to claim 1 according to claim 2. The branch connection structure with the pipes attached was constructed as follows. That is, after inserting the spigot of the joint into the connection hole of the main pipe, the spigot of the mounting pipe is inserted into the joint, and the joint and the mounting pipe are adhesively bonded to each other.

Here, the shape of the main body portion of the joint, that is, the shape of the joint main body, is only required to be connectable to the mounting pipe. Therefore, in addition to the cylindrical shape, the shape may be, for example, an elliptical shape or a polygonal shape, and is not particularly limited.
Further, as such a joint body, it is preferable to use an injection molded product made of a material such as vinyl chloride resin, polyethylene, polypropylene or the like, in consideration of corrosion resistance and ease of manufacturing. In that case, in order to increase the strength, the outer peripheral surface of the joint body may be reinforced by winding glass fiber or the like.

On the other hand, the water blocking member needs to be arranged at the opening portion so as to come into contact with the inner peripheral surface of the main pipe connecting hole. It is preferable to extend the mounting range to the base end side of the mouth, that is, the side opposite to the front end of the outlet (see FIG. 4). An elastic body such as a rubber packing is usually used as such a water blocking member, but any member capable of exhibiting sufficient water blocking performance when pressed against the main pipe side may be used.

In the case where the water blocking member cannot be mounted in a sufficient range because the diameter of the main pipe is small and the wall thickness is thin, the mounting range is set wide along the outer wall surface of the main pipe as described above. I should do it. Also, if you want to improve the adhesion between the main pipe and the water blocking member to improve the fixing force to the main pipe, make sure that the compression ratio of the water blocking member after inserting the mounting pipe is large, You can set the thickness of the thicker.

Further, when the mounting pipe is inserted into the opening of the joint and the bending stress caused by the expansion of the opening may exceed the allowable range of the material of the joint, the so-called bending span is used. The length of the slit at the front end may be lengthened so as to increase (see FIG. 5). By doing so, the bending stress generated at the opening when the mounting tube is inserted can be reduced.

[0019]

According to the above construction, since the outer diameter of the spout provided at one end of the joint is set to be smaller than the hole diameter of the connection hole of the main pipe, for example, the main connection hole is screwed. There is no need for high insertion accuracy as in the case of cutting and screwing. Therefore, when the joint spigot is inserted into the main pipe connection hole, the spigot can be inserted into the main pipe connection hole even if the insertion position of the joint is slightly displaced.

Further, at the outlet of this joint, the length of the portion that enters the connection hole when setting the joint in the main pipe connection hole is substantially equal to the wall thickness of the pipe wall around the connection hole in the main pipe, or By setting it to be less than that, the insertion end tip side will not project into the main pipe after insertion into the main pipe connection hole,
It is possible to avoid a decrease in the flow-down ability of the main pipe. Furthermore,
In this way, after inserting the joint spigot into the main connection hole,
When the mounting pipe is inserted into the joint and the tip of the spigot in the mounting pipe is located inside the joint spigot, the joint spigot is pushed outward from the inside by the mounting pipe, and the diameter increases by that amount. .. As a result, the water blocking member provided on the outer periphery of the spigot is pressure-bonded to the peripheral portion of the main pipe connection hole, so that the joint and the main pipe are securely sealed and both are fixed. It will be. As a result, the main pipe and the mounting pipe are firmly and surely connected to each other via the joint, and sufficient water shutoff is secured between the joint and the main pipe.

In addition, since the main pipe and the joint are mechanically joined to each other with the water blocking member interposed therebetween in this manner, the joint and the fitting pipe inserted therein are adhesively joined to each other. Even if a force in the compression direction or a bending force acts on the mounting pipe branch portion due to ground displacement or the like after laying the pipe, those forces are absorbed by the flexibility of the water blocking member. As a result, it is possible to avoid the occurrence of cracks at the branch portion of the mounting pipe, and to prevent the deterioration of the water-stop performance and the occurrence of water leakage.

Further, according to the first to third inventions of the present application as described above, since the process from the main pipe side is unnecessary in the connecting work between the main pipe and the mounting pipe, the man-hours are reduced accordingly. become.

[0023]

EXAMPLES Examples of the present invention will be described below. As shown in FIG. 1, the joint 1 according to this embodiment has a stepped cylindrical joint body 2 whose outer diameter except for one end is larger than the hole diameter of the connection hole 3 a of the main pipe 3. A joint 2a for the main pipe connection hole 3a is provided at one end of the joint body 2, and an attachment pipe (see FIG. 2) described later is provided at the other end.
The stopper portion 2b is formed to regulate the insertion position (see the reference).

The outlet 2a of the joint body 2 is a main pipe connection hole 3a.
2c has a smaller outer diameter than the diameter of the connection hole 3a, and a plurality of slits 2c ... 2c extending in the axial direction are formed on the peripheral wall of the connection hole 3a. In addition, in this spigot 2a, the length of the part that enters the connection hole 3a is set so as not to project into the main pipe 3 when the joint is set in the main connection hole 3a. The wall shape is approximately the same as the wall thickness of the pipe portion, and the tip shape is formed so as to follow the inner wall surface shape of the peripheral portion of the main pipe connecting hole 3a. Further, since the inner surface is formed in a tapered shape toward the tip of the outlet, the inner diameter of the tip is smaller than the inner diameter of the proximal end of the outlet 2a, that is, the inner diameter of the intermediate portion 2d of the joint body 2. It is set to a small size.

Further, an annular rubber packing 4 is attached to the outer periphery of the spigot 2a as a water blocking member. Then, with the joint 2 set in the connection hole 3a of the main pipe 3,
As shown in FIG. 2, an insertion port 5a provided at one end of the mounting pipe 5 is inserted in the joint body 2 in the direction of arrow A, and the tip of the mounting pipe insertion port 5a is inserted as shown in FIG. When located in the port 2a, the joint port 2a is attached to the inner side of the mounting pipe port 5
a, the rubber packing 4 is sandwiched between the joint opening 2a and the hole edge portion of the main pipe connecting hole 3a, and closely adheres to them in a compressed state, whereby The pipe 3 and the pipe 3 are sealed.

Here, the end 5a of the attachment pipe 5 is formed in a shape along the inner wall surface shape of the peripheral portion of the main pipe connection hole 3a so as not to project inward of the main pipe when being attached to the main pipe 3. Has been done. Further, the outer diameter of the attachment pipe opening 5a is slightly smaller than the inner diameter of the intermediate portion 2d of the joint 2 and the joint opening 2a
The size is larger than the inner diameter of the tip side. That is, the outer diameter of the attachment pipe inlet 5a has a dimension between the inner diameters of the intermediate portion 2b of the joint 2 and the inlet 2a.

When the mounting pipe 5 is inserted into the joint 2, the adhesive 6 is applied to the contact surface between the two, that is, the outer surface of the insertion portion of the mounting pipe 5 and the inner surface of the joint 2. , Adhesively bonded to each other. The fitting 1 and the mounting pipe 5
Is attached to a predetermined position of the main pipe 3 as follows.

First, the pipe wall of the main pipe 3 is drilled, and as shown in FIG. 2, a diameter that is about the same as or slightly larger than the outer diameter of the rubber packing 4 in the joint 2 (however, the diameter of the joint inlet 2a is increased). The connection hole 3a having a diameter smaller than the outer diameter of the rubber packing after the diameter is formed. After forming the connection hole, the outlet 2a with the rubber packing of the joint 2 is inserted into the connection hole 3a (see FIG. 1). At this time, in the joint 2, the outer diameter of the spigot 2a is made smaller than the hole diameter of the connection hole 3a, and the outer diameter of the rubber packing 4 is set to the same or slightly smaller than the hole diameter of the connection hole 3a. Therefore, the spigot 2a can be extremely easily inserted into the connection hole 3a.

Next, the insertion port 5a of the attachment pipe 5 is inserted into the joint 1, and the tip of the attachment pipe insertion port 5a is positioned inside the joint insertion port 2a. By doing so, the joint opening 2a is pushed outward from the inside by the mounting pipe opening 5a, and the diameter is expanded by a predetermined amount. As a result, as shown in FIG. 3, the rubber packing 4 is sandwiched between the joint opening 2a and the hole edge portion of the main pipe connecting hole 3a, and adheres thereto in a compressed state. As a result, the main pipe 3 and the mounting pipe 4 are surely and firmly connected to each other via the joint 1, and the joint 1 and the main pipe 3 are surely sealed, so that a sufficient waterproof property is provided between them. Will be secured.

When the mounting pipe 5 is inserted, the adhesive is applied to the outer surface of the spigot 5a and the inner surface of the joint 1 in advance, so that the joint 1 and the mounting pipe 5 are adhesively joined to each other and the two are joined together. Will become even stronger. Further, while the rubber packing 4 is sandwiched in this manner, the main pipe 3 and the joint 1 are joined by mechanical fitting, while the fitting pipe 5 is inserted into the opening 2a of the joint 1 and adhered to each other. Since they are joined, even if a force in the compression direction or a bending force acts on the mounting pipe branch portion due to, for example, ground displacement after laying the mounting pipe, those forces are absorbed by the flexibility of the rubber packing 4. It As a result, it is possible to avoid the occurrence of cracks at the branch portion of the mounting pipe, and to prevent the deterioration of the waterproof performance, that is, the occurrence of water leakage.

In the above embodiment, the width (axial length) of the rubber packing 4 is substantially the same as the wall thickness of the pipe wall around the connection hole of the main pipe 3, but FIG. As in the second embodiment shown, the total length of the spigot 12a of the joint 11 is made larger than the wall thickness of the peripheral portion pipe wall of the connection hole 13a of the main pipe 13, and a relatively wide width is provided on the outer circumference of the spigot 12a. Rubber packing 1
4 may be attached. In this case, the rubber packing 14 is also brought into close contact with the outer wall surface around the connection hole of the main pipe 13, so that the water blocking performance can be further improved and the bending force can be dealt with more flexibly. become.

Further, as in the third embodiment shown in FIG. 5, the total length of the spigot 22a of the joint 21 may be increased and a slit (not shown) may be provided over the entire length. By doing this, the mounting pipe 2 is extended to the inside of the joint inlet 22a.
Since the bending stress caused by the diameter expansion of the insertion port 22a becomes relatively small when 5 is inserted, even if a material relatively weak against the bending stress is used, the insertion port when inserting the mounting pipe It is possible to surely avoid breakage of 22a.

Further, when there is a risk that the rubber packing is compressed in the joint axial direction and protrudes inward of the main pipe when the joint is set in the main pipe connection hole, as in the fourth embodiment shown in FIG. In addition, the stopper portion 32e for the main pipe 33 may be provided outside the base end side of the outlet 32a of the joint 31. With this configuration, when the joint insertion hole 32a is inserted into the main pipe connection hole 33a by a predetermined amount, the stopper portion 32e comes into contact with the outer peripheral wall surface of the main pipe connection hole 33a and further insertion is prevented. As a result, the rubber packing 34 is prevented from being compressed more than necessary along the joint axial direction, so that the above-described danger of the main pipe 33 protruding inward can be eliminated.

[0034]

As described above, according to the present invention, since a high insertion accuracy is not required when inserting the spigot of the joint into the connection hole of the main pipe, a joint is compared with the main pipe connection hole. The main pipe and the mounting pipe can be reliably and firmly connected via the joint by inserting the mounting pipe into the joint opening after the insertion and bonding the two together It will be.

Further, after the connection, not only the water between the joint and the main pipe is sufficiently stopped by the water stop member, but also the force in the compression direction or the bending force acts on the connection portion due to the ground displacement, for example. However, since those forces are absorbed by the flexibility of the water blocking member, it is possible to avoid the occurrence of cracks at the branch portion of the mounting pipe, and to prevent the deterioration of the water blocking performance and the occurrence of water leakage.

Furthermore, the length of the joint portion that enters the connection hole when setting the joint in the main pipe connection hole is approximately equal to or less than the wall thickness of the pipe wall around the connection hole in the main pipe. As a result, the joint does not project inwardly of the main pipe after being inserted into the main pipe connection hole, so that the flow-down capability of the main pipe does not decrease.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view showing a joint according to a first embodiment of the present invention.

FIG. 2 is a partially longitudinal front view showing a state before connecting a mounting pipe to a main pipe through the joint.

FIG. 3 is a partially longitudinal front view showing a state in which an attachment pipe is connected to a connection hole of a main pipe via a joint.

FIG. 4 shows a second embodiment of the present invention and is a partially longitudinal front view showing a state in which an attachment pipe is connected to a connection hole of the main pipe via a joint.

FIG. 5 shows a third embodiment of the present invention and is a partially longitudinal front view showing a state in which an attachment pipe is connected to a connection hole of the main pipe via a joint.

FIG. 6 shows a fourth embodiment of the present invention and is a partially longitudinal front view showing a state in which an attachment pipe is connected to a connection hole of the main pipe via a joint.

[Explanation of symbols]

 1,11,21,31 ... Joint for joining branch part, 2 ... Joint body, 2a, 12a, 22a, 32a ... Joint opening, 2c ... Slit, 3, 13, 33 ... -Main pipe, 3a, 13a, 33a ... Connection hole, 4, 14, 34 ... Water blocking member (rubber packing) 5,25 ... Mounting pipe, 5a ... Mounting pipe outlet.

Claims (3)

[Claims] 1. A branch joint for use in joining a mounting pipe to a main pipe buried in the ground so as to intersect with the main pipe, the slit extending in the axial direction at one end. Is provided and the tip shape is formed so as to follow the shape of the inner wall surface around the connection hole of the main pipe, and the outer diameter at this opening is smaller than the hole diameter of the connection hole and the inner diameter. Is set to a size smaller than the inner diameter of the other end or the intermediate portion of the joint, and the length of the portion that enters the connection hole when setting the joint in the main pipe connection hole is the length of the peripheral portion of the connection hole in the main pipe. The wall thickness is approximately equal to or less than the wall thickness of the pipe wall, and the outer circumference of the spigot is provided with a water blocking member that seals between the joint and the main pipe when the joint is set. A characteristic joint for joining branch parts. 2. A mounting pipe which is mounted so as to intersect with a main pipe buried in the ground, wherein an end portion is provided with a spigot, and the tip of the spigot is the main pipe. The other end of the joint according to claim 1, which is formed in a shape along the inner wall surface shape of the main pipe connection hole peripheral portion so as not to project inward of the main pipe when attached to the main pipe. An installation pipe characterized by being set to have a size substantially equal to or slightly smaller than the inner diameter of the portion or the intermediate portion and larger than the inner diameter of the outlet. 3. A branch portion connecting structure in which the mounting pipe according to claim 2 is attached to the main pipe buried in the ground via the branch joint joint according to claim 1. The branch connection structure, wherein the joint opening is inserted into the connection hole, and then the attachment pipe opening is inserted into the joint to bond the both.