JP2002340271A - Branch joint for insertion pipe, and branching method and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the trouble and cost for backfill by branching an insertion pipe to a new branch pipe in an existing branch pipe so as to eliminate the need of open-cut and backfill earth (road) on the existing pipeline. SOLUTION: The outside diameter of a new branch joint 20 is smaller than the inside diameter of the existing main pipe 12 and a branch socket 32 is projected toward the inside of the new branch joint 20, so that the new branch joint 20 is joined to a position of the exiting main pipe 12 corresponding to the existing branch pipe 14 and the insert pipe 16 is inserted in the existing main pipe 12. A new branch pipe 22 is inserted in the branch socket 32 of the new branch joint 20 through the existing branch pipe 14. Thus, in a part of the existing branch pipe 14, branching can be performed from the insertion pipe 16 through the new branch joint 20 to the new branch pipe 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch joint, a branching method, and a structure for an insertion pipe, and more particularly to a branch joint for an insertion pipe used for, for example, rehabilitating (repairing) or renewing an existing aging pipe from the inside. And branching methods and structures.

[0002]

2. Description of the Related Art Conventionally, there is an insertion method in which a synthetic resin insertion pipe is inserted into an existing pipe in order to rehabilitate and renew the buried existing pipe from the inside. When a branch pipe is connected to an existing pipe, a new branch joint such as a saddle branch joint or T
It is necessary to attach a U-shaped pipe joint. However, the new branch joint cannot pass through the existing branch pipe because it is larger than the inner diameter of the existing branch pipe. Therefore, for example, soil (road) on an existing pipe is cut and cut, and an opening is formed in a branch of the existing pipe, and a new branch joint is inserted from this opening and attached to the insertion pipe.

[0003]

However, in order to attach a new branch joint to the insertion pipe, the road on the existing pipe is cut and cut, for example, a hole is made in the branch of the existing pipe, or a new branch is formed. Performing backfilling of the soil after attaching the joint has a problem that it requires much labor and cost.

SUMMARY OF THE INVENTION It is, therefore, a primary object of the present invention to provide a branch joint, a branching method, and a structure for an insertion tube, which require less labor and cost.

[0005]

A first aspect of the present invention is a branch joint for an insertion pipe for inserting an insertion pipe into an existing pipe having a branch pipe and branching from the insertion pipe. A branch joint for an insertion tube having a smaller outer diameter and having a branch receiving port protruding inward.

A second invention is a method for branching an insertion pipe using the insertion pipe branch joint according to the first invention, wherein (a) a branch for an insertion pipe is located at a position corresponding to a branch pipe of an existing pipe. A method of branching from an insertion tube, comprising the steps of attaching a joint and inserting an insertion tube into an existing tube, and (b) inserting a new branch tube through a branch tube into a branch receiving port.

A third aspect of the present invention relates to an insertion pipe branching structure using the insertion pipe branch joint of the first invention, wherein the insertion pipe is inserted into the existing pipe, and the existing pipe branches in the insertion pipe. 1 is a branch structure of an insertion tube including a branch joint for an insertion tube attached to a position corresponding to a tube, and a new branch tube inserted through the branch tube into a branch receiving port.

A fourth invention is a method of inserting an insertion pipe into an existing pipe having a branch pipe and branching the insertion pipe. (A) A straight socket is provided at a position corresponding to the branch pipe of the existing pipe. Inserting the insertion tube into the existing tube while attaching it, (b) inserting the tube end of the new branch tube having a flange portion at the tube end through a hole formed in the straight socket, and A method for branching from an insertion tube, comprising a step of raising a new branch tube to project a periphery of a hole outward.

[0009]

According to the insertion pipe branch joint of the first invention, the outer diameter is smaller than the inner diameter of the existing pipe, and the branch receiving port for joining a new branch pipe projects inward. This branch joint can be inserted into the existing pipe without the branch receiving port being in the way. When using the branch joint to branch the insertion tube at the existing branch tube, for example, the branch joint is joined in the middle of the insertion tube, and the insertion tube is inserted into the existing tube. Then, the insertion pipe branch joint is arranged at a position corresponding to the existing branch pipe, and the new branch pipe is passed through the existing branch pipe and inserted into the branch receiving port. Thereby, in the part of the existing branch pipe, it is possible to branch from the insertion pipe to the new branch pipe via the insertion pipe branch joint.

According to the method of branching from an insertion pipe of the second invention, a branch joint for an insertion pipe is attached to a position corresponding to a branch pipe of an existing pipe in the insertion pipe, and this insertion pipe is inserted into the existing pipe. By doing so, the insertion pipe branch joint can be arranged at the position of the existing branch pipe. Then, by inserting the new branch pipe through the existing branch pipe and inserting it into the branch receiving port, the existing branch pipe can be branched from the insertion pipe to the new branch pipe via the insertion pipe branch joint.

According to the branch structure of the insertion pipe of the third invention, since the insertion pipe branch joint of the first invention is used, the branch joint is installed in the existing pipe without the branch receiving port being in the way. It can be inserted and arranged at a position corresponding to the existing branch pipe. Thereby, in the part of the existing branch pipe, it is possible to branch from the insertion pipe to the new branch pipe via the insertion pipe branch joint.

According to the method of branching from an insertion tube of the fourth invention, the tube end of the new branch tube having a flange at the tube end is inserted into the straight socket through the hole formed in the socket. I do. Then, the new branch pipe is pulled up, and the peripheral edge of the hole is pushed up and deformed by the flange-shaped portion, whereby the peripheral edge protrudes outside the socket.
In this way, it is possible to branch from the insertion pipe to the new branch pipe at the existing branch pipe. In this state, the outer surface of the new branch tube and the inner surface of the periphery of the hole of the socket are in close contact with each other, and the contact portion is sealed by the elastic force of the tube wall of the socket.

[0013]

According to the present invention, for example, the insertion pipe can be branched at the existing branch pipe without digging the soil (road) on the existing pipeline or backfilling the soil. Therefore, the labor and cost for branching from the insertion tube can be reduced as compared with the related art.

Further, according to the present invention, the existing deteriorated pipe and the deteriorated branch pipe can be rehabilitated and renewed from the inside thereof by using the insertion pipe, the insertion pipe branch joint (or straight socket) and the new branch pipe.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the accompanying drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A branch structure of an insertion tube according to a first embodiment of the present invention (hereinafter sometimes simply referred to as a "branch structure") is, for example, as shown in FIG. In order to rehabilitate or renew the aging sewage main pipe (hereinafter referred to as “existing sewage main pipe”) 12 and the aging sewage branch pipe (hereinafter referred to as “existing branch pipe”) 14 from inside thereof, FIG. As shown, the present invention can be applied to an insertion method for inserting an insertion pipe 16 into an existing sewage main pipe 12. The existing pipe 10 includes an existing sewage main pipe 12, for example, a T-shaped sewage branch joint (hereinafter referred to as “existing branch joint”) 18 and an existing branch pipe 14. According to this branch structure, as shown in FIG. 3, when the existing branch pipe 14 is connected to the existing sewage main pipe 12 via the existing branch joint 18, excavation of soil (road) or the like on the existing pipeline is performed. Branching from the new branch joint 20 joined to the insertion pipe 16 without backfilling, the inner space 16a of the insertion pipe 16 and the inner space 22a of the new branch pipe 22 inserted into the existing branch pipe 14 are branched. And can be connected.

The existing branch joint 18 is, as shown in FIG.
A body 24 having an inner space is provided. This body 24
In each of the left and right ends, rubber ring sockets 26, 26 are formed, and the existing sewer main pipes 12, 12 are joined to the left and right rubber ring sockets 26, 26, respectively. The inner diameter of the cylindrical portion 24a of the main body 24, which abuts against each end of the left and right existing sewage main pipes 12, is the same as the inner diameter of the existing sewage main pipe 12. An upper portion of the main body 24 has a branch rubber ring socket 28 formed therein, and the existing branch pipe 14 is joined to the branch rubber ring socket 28. The main body 2 abutted against the lower end of the existing branch pipe 14
The inner diameter of the upper cylindrical portion 24 b of the fourth branch pipe 14 is substantially the same as the inner diameter of the existing branch pipe 14.

The existing sewage main pipes 12, 12, the existing branch joint 18, and the existing branch pipe 14 are buried under the road, and are made of a synthetic resin such as vinyl chloride, polyethylene, or polybutene. The existing sewer main 1 shown in FIG.
2 and the rubber ring socket 26, and the joints between the existing branch pipe 14 and the branch rubber ring socket 28 are bonded and bonded by an adhesive, and are sealed by a rubber ring.

As shown in FIG. 3, the insertion pipe 16 is a cylindrical body having an outer diameter smaller than the inner diameter of the existing sewage main pipe 12, and is made of a synthetic resin such as vinyl chloride, polyethylene, or polybutene. This insertion tube 16
It is inserted to rehabilitate and renew the existing sewage main pipe 12 from the inside. A new branch joint (branch joint for insertion pipe) 20 is joined to a position corresponding to the existing branch pipe 14 in the middle of the insertion pipe 16.

The new branch joint 20, as shown in FIG.
It is substantially cylindrical and has an outer diameter smaller than the inner diameter of the existing sewer main pipe 12. Receptacles 30 are formed at the left and right ends of the new branch joint 20, and the ends of the insertion tube 16 are joined to the left and right receptions 30, respectively. And these left and right insertion tubes 16
Each end of the main body 20a of the new branch joint 20 has a substantially cylindrical shape.
Is matched. The inner diameter of the main body 20a is
It is almost the same as the inner diameter of the insertion tube 16. Also,
At the upper part of the tube wall of the main body part 20a, a substantially cylindrical branch receiving port 3 is provided.
2 is formed, and the lower end of the new branch pipe 22 is joined into the branch receiving port 32. This new branch pipe 2
The inner diameter of the annular projection 32a in contact with the lower end surface of
The inner diameter of the new branch pipe 22 is substantially the same, and a through hole 34 is formed inside the annular projection 32a. The central axes of the through hole 34, the new branch pipe 22, and the existing branch pipe 14 are on the same straight line. Further, as shown in FIGS. 3 and 4, the branch receiving port 32 protrudes toward the inside of the new branch joint 20, and the amount of protrusion is about 1/3 of the inner diameter of the main body 20a. . The new branch pipe 22 is inserted into the existing branch pipe 14. In order to facilitate insertion of the lower end of the new branch pipe 22 into the branch receptacle 32 of the new branch joint 20, the inner peripheral surface of the branch receptacle 32 is formed as a tapered hole whose inner diameter increases toward the outside. It is.

Thus, as shown in FIG. 3, the new branch joint 20 includes the insertion pipe 16 and the new branch pipe 22.
With the inner space 1 of the insertion tube 16
6a and the inner space 22a of the new branch pipe 22 communicate with each other. Then, the insertion tube 16 and the receiving port 3
0, and the respective junctions of the new branch pipe 22 and the branch receiving port 32 are adhesively bonded in a state sealed with an adhesive. The new branch joint 20 and the new branch pipe 22 are made of synthetic resin such as vinyl chloride, polyethylene, and polybutene.

The new branch joint 2 shown in FIGS. 3 and 4
According to No. 0, the outer diameter is smaller than the inner diameter of the existing sewage main pipe 12, and the branch receiving port 32 for joining the new branch pipe 22 does not protrude outside the new branch joint 20 and faces inward. Since it projects, the new branch joint 20 can be inserted into the existing sewage main pipe 12 without the branch receiving port 32 being in the way. Then, by arranging the new branch joint 20 at a position corresponding to the existing branch pipe 14 as shown in FIG. 3, the new branch pipe 22 is inserted into the existing branch pipe 14 and the lower end of the new branch pipe 22 is inserted. The branch port 32
Can be joined. Therefore, according to the branch structure of the insertion pipe using the new branch joint 20 as described above, the soil (road) on the existing pipeline is not cut out,
In the part of the existing branch pipe 14, it is possible to branch from the insertion pipe 16 to the new branch pipe 22 via the new branch joint 20.

Next, referring to FIGS. 1 to 3 and 5, FIG.
A method of branching from the insertion tube for manufacturing the branch structure shown in FIG. Now, as shown in FIG. 1, an existing branch pipe 14 is connected to the buried existing sewer main pipes 12, 12 via an existing branch joint 18. Existing branch pipe 14
Is connected to, for example, a house cell or a public cell (not shown).

First, as shown in FIG. 5, the insertion pipe 16 is inserted into the existing sewage main pipe 12 through an opening of the manhole 36 or the like. 12, it is necessary to be able to arrange the new branch joint 20 at a position corresponding to the existing branch pipe 14 while being inserted into the existing branch joint 18 and the existing sewage main pipe 12. Therefore, when inserting the insertion pipe 16 into the existing sewer main pipe 12 through the opening of the manhole 36, the new branch joint 20 is attached to the insertion pipe 16 at a position corresponding to the existing branch pipe 14. While inserting, it is inserted into the existing sewer main pipe 12. Although not shown in the drawing, the insertion tube 16 is easily inserted when it is heated to a predetermined temperature and inserted from the manhole 36 in a flexible state. The insertion pipe 16 is naturally cooled and hardened while being inserted into the existing sewage main pipe 12 and the existing branch joint 18. However, in this inserted state, the branch receiving port 32 of the new branch joint 20 is directed to the existing branch pipe 14, as shown in FIG.

Next, as shown in FIG.
It is confirmed that the 0 branch receiving port 32 is arranged in the existing branch pipe 14. This check is visually performed by an operator from the upper opening of the existing branch pipe 14. Thereafter, an adhesive is applied to the inner peripheral surface of the branch receiving port 32. When applying the adhesive to the branch receiving port 32, for example, a rod-shaped member (not shown) having a brush attached to the tip is inserted into the existing branch pipe 14, and the adhesive attached to the brush is Is applied to the inner peripheral surface of the branch receiving port 32.
An adhesive is applied to the outer peripheral surface of the lower end portion of No. 2. Then, the new branch pipe 22 is passed through the upper opening of the existing branch pipe 14 and inserted into the inside, and the lower end coated with the adhesive is inserted into the branch receiving port 32 and joined. This state is the state shown in FIG. This completes the fabrication of the insertion tube branching structure.

Here, the new branch pipe 22 and the new branch joint 2
As the adhesive for bonding the branch port 32 of the No. 0 and the adhesive for bonding the insertion tube 16 and the port 30 of the new branch joint 20, for example, an adhesive such as a vinyl acetate resin emulsion type or a chloroprene rubber type is used. You are using
In short, it is preferable to use an adhesive that can reliably and hermetically seal the joint between the two and that has excellent adhesion to the new branch pipe 22, the new branch joint 20, and the insertion pipe 16. Therefore, the new branch pipe 22, the new branch joint 20, and the insertion pipe 16
It is preferable to use an adhesive of an appropriate material according to the material of the above.

According to the above-described branching method from the insertion pipe, the existing branch pipe 14 in the insertion pipe 16 is used.
By inserting the insertion pipe 16 into the existing sewage main pipe 12 and the existing branch joint 18 by attaching the new branch joint 20 to a position corresponding to
Can be arranged at the position of the existing branch pipe 14. Then, the new branch pipe 22 is joined to the insertion pipe 16 at the portion of the existing branch pipe 14 by passing the new branch pipe 22 through the existing branch pipe 14 and joining to the branch receiving port 32.
It is possible to branch from 0 to a new branch pipe 22.

Thus, the insertion pipe 16 can be connected to the new branch pipe 14 in the existing branch pipe 14 at the existing branch joint 18 without digging or backfilling the soil (road) or the like on the existing pipe 10. 22. Therefore, the labor and cost for branching from the insertion tube 16 can be reduced as compared with the related art.

The branch structure shown in FIG. 3 provides the insertion tube 16, the new branch joint 20, and the new branch tube 22 themselves with mechanical strength and the like as a fixed structure for passing a fluid (or gas). be able to. In addition, the mechanical strength and the like are measured by using the insertion pipe 16 and the new branch joint 2.
0 and the new branch pipe 22 and the existing pipe 10 may be provided in combination. That is, the existing pipe 10 can be updated or rehabilitated by the insertion pipe 16, the new branch joint 20, and the new branch pipe 22.

Next, the branch structure of the insertion tube according to the second embodiment (hereinafter sometimes simply referred to as "branch structure").
Will be described with reference to FIG. The difference between the branch structure of the second embodiment shown in FIG. 7 and the branch structure of the first embodiment shown in FIG. 3 is that the shapes of the insertion pipe 40 and the new branch pipe 42 are different, and that the insertion pipe 40 is different. And the joining structure of the new branch pipe 42 to the new branch joint 54 is different. Other than this, the branch structure is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

That is, the insertion tube 4 of the second embodiment
As shown in FIG. 7, the zero and new branch pipes 42 each have a large number of annular ribs 44 formed on the outer peripheral surface of a cylindrical main body.

The insertion tube 4 of the second embodiment
As shown in FIG. 7, the joining structure of the new branch joint 54 and the left and right receiving joints 46 of the new branch joint 54 is provided at the end of the insertion tube 40. An annular groove 52 formed on the inner surface of the mouth 30;
And an annular seal rubber 50. The detachment prevention ring 46 is mounted on an annular groove 48 formed between the ribs 44 formed at the end of the insertion tube 40. New branch joint 54
The groove 52 formed on the inner surface of each of the left and right receiving ports 30 is
In a state where the end of the insertion tube 40 is inserted into each of the receptacles 30 to a predetermined depth, the outer peripheral edge of the separation prevention ring 46 is fitted to the insertion prevention ring 46.
6 has a fitting shape. And seal rubber 5
Reference numeral 0 denotes an annular groove 4 formed in the insertion tube 40 at a position spaced from the separation prevention ring 46.
8 is attached. The sealing rubber 50 is used to connect each insertion tube 40 to each of the receiving ports 3 of the new branch joint 54.
0 and the separation prevention ring 46 is inserted into the groove 5 in the socket 30.
2 and the receiving port 30 and the insertion tube 40
Are sealed in a watertight and airtight manner.

The new branch pipe 42 and the new branch joint 54
As shown in FIG. 7, the joining structure with the separation prevention ring (C-shaped ring) 4 attached to the end of the new branch pipe 42 is shown in FIG.
6, an annular groove 52 formed on the inner surface of the branch receiving port 32 of the new branch joint 54, and an annular seal rubber 50 are provided. These separation prevention ring 46 and annular groove 5
2, and the annular seal rubber 50 (the joint structure between the new branch pipe 42 and the new branch joint 54) are connected to the insertion pipe 4
0 of the joint structure between the first branch joint 54 and the new branch joint 54
6, since they are equivalent to the annular groove 52 and the annular seal rubber 50, detailed description thereof will be omitted. Therefore, the new branch joints 20 and 54 of the first embodiment and the second embodiment are the same except that the joining structure is different, and the detailed description of the equivalent parts is omitted.

When joining the insertion pipe 40, the new branch pipe 42, and the new branch joint 54 to each other,
The insertion pipe 40 and the new branch pipe 42 are connected to the new branch joint 5 without using an adhesive as in the first embodiment.
It is sufficient to insert the anti-separation ring 46 into the groove 52 by inserting it into each of the receptacles 30 and the branch receptacle 32 of FIG. Thereby, the insertion pipe 40 and the new branch pipe 42 can be joined so as not to come off from the new branch joint 54, and the respective joints can be water-tightly and air-tightly sealed by the seal rubber 50. Therefore, the joining operation can be performed easily in a short time.

In particular, as shown in FIG.
4 in a position corresponding to the existing branch pipe 14,
The two can be joined only by inserting the lower end of the new branch pipe 42 into the branch port 32 of the new branch joint 54 and fitting them together. Therefore, as in the first embodiment, a brush is used for branch receiving. There is no need to apply an adhesive to the opening 32, and the joining operation can be performed simply and reliably.

Next, a method of branching from an insertion tube for manufacturing the branch structure shown in FIG. 7 will be described. The method of branching from the insertion pipe of the second embodiment is different from that of the first embodiment in that the insertion pipe 16 and the new branch pipe 22 are replaced with the new branch joint 20 in the first embodiment.
In the second embodiment, as shown in FIG. 6 and FIG. 7, the insertion tube 40 and the new The branch pipe 42 is being joined to the receiving port 30 and the receiving port 32 of the new branch joint 54 using the separation prevention ring 46 and the seal rubber 50. Otherwise, the branching structure can be manufactured according to the same procedure as in the first embodiment, and a detailed description thereof will be omitted.
FIG. 6 is a longitudinal sectional view showing a state where the insertion pipe 40 to which the new branch joint 54 is joined is inserted into the existing sewage main pipe 12, the existing branch joint 18 and the existing sewage main pipe 12. FIG. 7 shows that a new branch pipe 42 whose outer diameter is smaller than the inner diameter of the existing branch pipe 14 is inserted inside the existing branch pipe 14, and the lower end of the new branch pipe 42 is connected to the new branch joint 5.
It is a longitudinal cross-sectional view which shows the state joined to the branch receiving port 32 of No. 4.

Next, the insertion tube 16 of the third embodiment is shown.
(Hereinafter sometimes simply referred to as “branch structure”) will be described with reference to FIG. The difference between the branch structure of the third embodiment shown in FIG. 9 and the branch structure of the first embodiment shown in FIG.
8 is different from that of FIG. Otherwise,
The branch structure is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and the detailed description thereof will be omitted.

That is, the insertion tube 1 of the third embodiment
As shown in FIG. 9, the joint structure between the first branch joint 6 and the new branch joint 58 is a structure in which each spout 60 of the new branch joint 58 is mounted inside the open end of each insertion tube 16. . The inner peripheral surface of the opening end of the insertion tube 16 and the outer peripheral surface of the spigot 60 of the new branch joint 58 are adhered by an adhesive, and the joint is water-tightly and air-tightly sealed. Note that each spout 60 of the new branch joint 58 is, as shown in FIGS.
It is formed at each of the left and right ends of Oa, and has a tapered barrel shape whose outer diameter decreases toward the tip. As described above, the outlet 60 is tapered.
This is to facilitate insertion into the opening end of the insertion tube 16 and to facilitate joining. The new branch joint 58 of the third embodiment has a spigot 60 formed in place of the socket 30 of the first embodiment, and the other parts are the same. Therefore, detailed description of the same parts will be omitted. .

According to the joining structure of the insertion pipe 16 and the new branch joint 58, as shown in FIG. 9, each spigot 60 of the new branch joint 58 is inserted inside each open end of the insertion pipe 16. In this joined state, each spout 60 can be prevented from protruding outside the tube wall at each open end of the insertion tube 16 in this joined state. Thereby, when inserting the insertion pipe 16 to which the new branch joint 58 is joined into the existing sewage main pipe 12 and the existing branch joint 18, the spout 6 of the new branch joint 58 is inserted.
0 can be smoothly inserted without being caught on the inner surfaces of the existing sewage main pipe 12 and the existing branch joint 18.

Next, a method of branching from the insertion tube for producing the branch structure shown in FIG. 9 will be described. The third embodiment differs from the first embodiment in the method of branching from the insertion tube. In the first embodiment, as shown in FIG. In the third embodiment, as shown in FIG. 9, the spigot 60 of the new branch joint 58 is inserted inside the open end of the insertion tube 16 while being inserted into and joined to the inside of the receiving port 30. Is being inserted and joined. Otherwise, the branching structure can be manufactured according to the same procedure as in the first embodiment, and a detailed description thereof will be omitted.
FIG. 8 is a longitudinal sectional view showing a state where the insertion pipe 16 to which the new branch joint 58 is joined is inserted into the existing sewage main pipe 12, the existing branch joint 18, and the existing sewage main pipe 12. FIG. 9 shows that the new branch pipe 2 is provided inside the existing branch pipe 14.
2 is a longitudinal cross-sectional view showing a state where the lower end of the new branch pipe 22 is inserted and the lower end of the new branch pipe 22 is joined to the branch receiving port 32 of the new branch joint 58.

Next, the branch structure of the insertion tube according to the fourth embodiment (hereinafter sometimes simply referred to as "branch structure").
Will be described with reference to FIG. The branch structure of the fourth embodiment shown in FIG. 12 differs from the branch structure of the first embodiment shown in FIG. 3 in that an annular projection 66 is provided in the branch receiving port 32 of the new branch joint 64. .

That is, the new branch joint 64 of this embodiment
Is the new branch joint 2 of the first embodiment, as shown in FIG.
In FIG. 0, an annular protrusion 66 is provided along the opening edge of the branch receiving port 32 on the side where the new branch pipe 22 is inserted, and protrudes outside the new branch joint 64. The annular protrusion 66 is provided at the lower end of the new branch pipe 22 for the branch receiving port 3.
This is for further increasing the insertion depth with respect to 2 by the height of the projection 66. The projection 66 forms a tapered hole together with the branch receiving port 32. According to this annular projection 66, the joining strength when the lower end of the new branch pipe 22 is inserted into the branch receiving port 32 and adhered by the adhesive is made stronger than that in which the projection 66 is not formed. be able to. In addition, by providing the protrusion 66 without changing the insertion depth, the length of protrusion to the inside of the joint is reduced,
The inner diameter (flow rate) of the new branch joint can be increased.

Other than this, the structure is the same as that of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted. The method of branching from the insertion tube for manufacturing the branch structure shown in FIG.
Insertion tube 16 for producing the branch structure shown in FIG.
Since these methods are equivalent to the branching method from, the detailed description thereof is omitted. FIG. 11 is a longitudinal sectional view showing a state where the insertion pipe 16 to which the new branch joint 64 is joined is inserted into the existing sewage main pipe 12, the existing branch joint 18, and the existing sewage main pipe 12. FIG. 12 is a longitudinal sectional view showing a state in which the new branch pipe 22 is inserted inside the existing branch pipe 14, and the lower end of the new branch pipe 22 is joined to the branch receiving port 32 of the new branch joint 64. is there.

Next, a branch structure from the insertion tube of the fifth embodiment (hereinafter sometimes simply referred to as a "branch structure") will be described with reference to FIG. The fifth shown in FIG.
The difference between the branch structure of the first embodiment and the branch structure of the first embodiment shown in FIG. 3 is that the flange 70 is not formed at the lower end of the new branch pipe 22 of the first embodiment. A flange 70 is formed at the lower end of the new branch pipe 78 according to the fifth embodiment. However, the new branch joint 20 according to the first embodiment has the branch receiving port 32 formed therein. On the other hand, in the new branch joint 72 of the fifth embodiment, a through hole 74 is formed in place of the branch receptacle 32, and the partition member 76 is not formed in the first embodiment. On the other hand, the fifth
In the embodiment, the partition member 76 is formed. Other than this, it is equivalent to the branch structure of the first embodiment,
Equivalent parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, as shown in FIG. 16, the new branch pipe 78 has a lower end inserted into the through hole 74 and an outer peripheral surface of the lower end formed on the inner surface of the peripheral edge 74a of the through hole 74 (the insertion pipe 16). (Inner surface) of the substrate through an adhesive. The inner diameter of the through hole 74 is larger than the original state shown in FIG. 13 due to the insertion of the new branch pipe 78. The peripheral edge 7 of the through hole 74
4a is bent so as to protrude outside the new branch joint 72, and is embedded in the partition member 76. The inner diameter of the peripheral edge 74 a of the through hole 74 matches the inner diameter of the second cylindrical portion 76 b of the partition member 76. As described above, the outer peripheral surface of the lower end portion of the new branch pipe 78 is held in a state of being bonded to the inner peripheral surface of the peripheral edge 74a forming the through hole 74. 72 are sealed by the elastic force (restoring force) of the main body portion 20a.

An annular flange 70 is formed on the periphery of the lower end of the new branch pipe 78.
The outer peripheral edge on the upper side of 0 is in contact with the inner side surface of the bent portion of the peripheral edge 74 a forming the through hole 74. The lower end surface of the new branch pipe 78 and the flange 70 are formed in a shape curved inward along the inner surface of the main body 20 a of the new branch joint 72. This prevents the new branch pipe 78 from coming off the through hole 74.

The partition member 76 is, as shown in FIG.
A first tubular portion 76a and a second tubular portion 76b are provided, and are integrally formed of, for example, epoxy resin. The first tubular portion 76a is provided with a gap 80 formed between the tubular portion 24a of the branch joint main body 24 and the new branch joint 72, and ends of the left and right existing sewage main pipes 12 and the new branch joint 7.
2 is filled with epoxy resin to form a predetermined thickness. 2nd cylindrical part 76
b is the upper cylindrical portion 24 b of the branch joint main body 24 and the gap 84 formed between the existing branch pipe 14 and the new branch pipe 78 up to the height reaching the lower end of the existing branch pipe 14. An epoxy resin is filled to form a predetermined thickness. The partition member 76 is provided for each existing sewage main 1.
2, 12 inner surface, inner surface of branch joint body 24, inner surface of lower end of existing branch pipe 14, outer surface of new branch joint 72,
And it joins in the state which adhere | attached the outer surface of the lower end part of the new branch pipe 78 closely.

Thus, the partition member 76 is connected to the outer peripheral surface of the lower end of the new branch pipe 78 and the through hole 7 of the new branch joint 72.
4 is sealed at the joint with the peripheral edge 74a. Further, a partition is provided between the inner space 16a of the insertion pipe 16 and the inner space 78a of the new branch pipe 78 and the gaps 86, 86, 84, and both are partitioned in a sealed state. The gap 86 is a cylindrical gap between the existing sewer main pipe 12 and the insertion pipe 16, and the gap 84 is a gap between the existing branch pipe 14 and the new branch pipe 78. The second tubular portion 76b of the partition member 76 is connected to the upper tubular portion 24b of the existing branch joint 18, the existing branch pipe 14, and the new branch pipe 7.
8 being fitted to and joined to the respective lower end portions,
In addition, since the first tubular portion 76a is connected to the branch joint main body 24, the end of the existing sewage main pipe 12, and the new branch joint 72, the insertion pipe 16 does not shift in the axial direction of the existing sewage main pipe 12. So that the second tubular portion 76b can be held securely in the upper tubular portion 24b of the branch joint main body 24.
From below. With the branching structure formed in this way, at the part of the existing branch joint 18 (the part of the existing branch pipe 14), the insertion pipe 16 is branched to the new branch pipe 78 via the new branch joint 72.

Next, referring to FIGS. 1, 13 to 16,
A method of branching from the insertion tube for manufacturing the branch structure shown in FIG. 13 will be described. Now, as shown in FIG. 1, the existing branch pipe 14 is connected to the buried existing sewage main pipe 12 via the existing branch joint 18 as in the first embodiment. First, as shown in FIG. 13, the existing sewage main pipe 12, the tubular portion 24 a of the existing branch joint 18 and the existing sewage main pipe 12
Insert the insertion tube 16 into the inside. As in the first embodiment, the insertion pipe 16 has a new branch joint 7.
2 are joined. When the insertion pipe 16 and the new branch joint 72 are inserted into the existing sewage main pipe 12 and the existing branch joint 18, as shown in FIG. 1
2 are held by a holding portion (not shown) such that the center axes of the cylindrical portion 24a of the branch joint main body 24 and the central axes of the cylindrical portion 24a substantially coincide with each other. In this state, cylindrical gaps 82 and 80 are formed between the existing sewage main pipe 12 and the tubular portion 24 a of the branch joint main body 24 and the new branch joint 72. And
The through hole 74 formed in the new branch joint 72 faces the existing branch pipe 14, and the central axes of the through hole 74 and the existing branch pipe 14 are substantially on the same straight line.

Next, as shown in FIG.
A new branch pipe 78 having an outer diameter smaller than the inner diameter of 4 is inserted into the existing branch pipe 14, and the lower end of the new branch pipe 78 is inserted into the insertion pipe 16 through the through hole 74. At this time, the peripheral edge 74 a of the through hole 74 is expanded in diameter and bent and deformed toward the inside of the insertion tube 16,
It is in a protruding state. The inner peripheral surface of the through hole 74 (the outer surface of the insertion tube 16) is
In close contact with the outer peripheral surface. However, this new branch pipe 78
An adhesive is applied to the outer peripheral surface of the lower end of the.

Next, as shown in FIG. 15, the new branch pipe 78 at the lowered position is pulled up. At this time, the flange portion 7 formed at the lower end of the new branch pipe 78 is formed.
0 deforms the peripheral edge 74a of the through hole 74 protruding toward the inside of the insertion tube 16 and raises the peripheral edge 74a upward, so that the peripheral edge 74a is deformed so as to protrude outside the insertion tube 16. In this state, the lower end of the new branch pipe 78 has its outer peripheral surface
a (the inner surface of the insertion tube 16)
It is joined to the inner surface of the new branch pipe 78 via an adhesive applied to the outer peripheral surface at the lower end. Through hole 74
Is joined to the outer peripheral surface of the new branch pipe 78 by the elastic force of the pipe wall of the new branch joint 72 and the adhesive. The flange portion 70 of the new branch pipe 78 has a shape curved inward in an arc shape, and the entire outer edge on the upper side is formed around the peripheral edge 74 of the through hole 74 formed in the new branch joint 72.
a is in close contact with the inner surface of the bent portion.

Next, as shown in FIG.
For example, an epoxy resin having fluidity is injected at a predetermined pressure from the upper opening of the gap 84 between the fourth branch pipe 78 and the new branch pipe 78, and the cylindrical portion 24a of the branch joint main body 24 and the left and right existing sewage main pipes. The gaps 80, 82, 82 formed between the end portion 12 and the new branch joint 72, and the gaps 84 between the existing branch pipe 14 and the existing branch joint 18 and the new branch pipe 78, and This resin is filled in the gap (inside space) up to the height reaching the lower end of the resin. Then, when the filled epoxy resin having fluidity is hardened by the lapse of a predetermined time, the partition member 76 is formed. This completes the fabrication of the insertion tube branching structure.

Although the epoxy resin is used as a material for forming the partition member 76, other adhesives, sealing materials, caulks, and the like may be used. In short,
The fluidity is good at the time of filling so that the gaps 80, 82, and 48 can be easily spread, and the gaps 80, 82, and 84 can be reliably airtightly and watertightly sealed in a hardened state. Pipe 12, Existing branch pipe 1
4. It is preferable to use an adhesive, a sealing material, a caulking material, or the like having excellent adhesiveness to the existing branch joint 18, the new branch joint 72, and the new branch pipe 78. Therefore, it is preferable to use a resin adhesive or the like of an appropriate material according to the material of the existing sewage main pipe 12, the existing branch pipe 14, the existing branch joint 18, the new branch joint 72, and the new branch pipe 78.

According to the method and structure for branching from the insertion tube, the existing branch tube 14 and the new branch tube 7
Epoxy resin having fluidity is injected from the upper opening of the gap 84 with the pipe 8 and is formed between the tubular section 24a of the branch joint main body 24 and the end of each existing sewage main pipe 12 and the new branch joint 72. Filling this resin into the gaps 80 and 82 and the gap 84 between the existing branch pipe 14 and the existing branch joint 18 and the new branch pipe 78 up to the height reaching the lower end of the existing branch pipe 14. Thereby, the partition member 76 can be formed. Thereby, the partition member 76 can be formed in a state of being closely attached to the new branch joint 72 and the new branch pipe 78.

In this way, with the inner space 16a of the insertion tube 16 and the inner space 78a of the new branch tube 78 communicating with each other, the joint between the new branch joint 72 and the new branch tube 78 is partitioned by the partition member 76. Can be tightly bonded to each other. These are then separated by the partition member 76 into the existing sewage main 1.
2. It can be firmly connected to the existing branch joint 18 and the existing branch pipe 14.

As described above, according to the branching method and the branching structure from the insertion tube of the second to fifth embodiments, the first
As in the embodiment, new branch joints 54, 58, and 6 are provided at positions corresponding to the existing branch pipe 14 in the insertion pipe 16.
4 and 72, the insertion pipe 16 can be inserted into the existing sewage main pipe 12 and the existing branch joint 18. Then, the new branch pipes 42, 22, 78 are passed through the existing branch pipe 14 and joined to the branch receiving port 32 (or the peripheral edge 74 a of the through hole 74), so that the insertion pipe 16 is formed at the existing branch pipe 14. From a new branch joint joined to a new branch pipe.

As a result, similarly to the first embodiment, the insertion pipe 16 is connected to the existing branch joint 18 at the new branch pipe 18 without cutting or backfilling the soil (road) on the existing pipe 10, for example. Can be branched. Therefore, the labor and cost for branching from the insertion tube 16 can be reduced as compared with the related art.

Each of the branch structures shown in FIGS. 7, 9, 12, and 16 has a mechanical strength and the like as a fixed structure for passing a fluid (or gas).
The new branch joints 54, 58, 64, 72 and the new branch pipes 42, 22, 78 can be provided.
Further, the mechanical strength and the like are determined by using the insertion pipe 16, the new branch joints 54,... And the new branch pipes 42,.
It can also be provided by a combination with 0. That is, the existing pipe 10 can be updated or rehabilitated by the insertion pipe 16, the new branch joint 54,... And the new branch pipes 42,.

However, in the fifth embodiment, FIG.
As shown in FIG. 5, epoxy resin is filled at a predetermined pressure in the gaps 82 and 80 between each end of the existing sewage main pipe 12 and the cylindrical portion 24a of the branch joint main body 24 and the new branch joint 72. In order to ensure that the filled epoxy resin having fluidity spreads over the entire area of the predetermined gaps 82 and 80, and that the existing sewage main pipe 1 is provided.
2 between each end of the second branch joint 72 and the new branch joint 72
The rubber ring (flow-stopping member) 8 shown in FIG.
8, 88 may be attached to the new branch joint 72 at two predetermined positions. The rubber ring 88 is used to connect the new branch joint 72 joined to the insertion pipe 16 to the existing sewage main pipe 12.
Before insertion into the new branch joint 72, it is attached to the outer peripheral surface of the new branch joint 72 at, for example, two predetermined positions of each of the sockets 30 shown in FIG. An annular groove is provided and fitted in the groove. Then, the new branch joint 72 joined to the insertion pipe 16 is inserted into the existing sewer main pipe 12, and as shown in FIG. 17, each rubber ring 88 corresponds to, for example, each end of the existing sewer main pipe 12. Position. Thereafter, the epoxy resin is filled at a predetermined pressure as described in the fifth embodiment. At this time, the air displaced by the filled epoxy resin from the gap 90 between the inner surface of the existing sewer main pipe 12 and the rubber ring 88 shown in FIG.
However, the epoxy resin is blocked by the rubber ring 88 and the outflow from the gap 90 is suppressed. Thereby, as shown in FIG. 16, the epoxy resin can be surely spread over the entire area within the predetermined gaps 80 and 82.

In FIG. 17, rubber rings 88 are attached at two predetermined positions of the new branch joint 72.
Alternatively, although not shown, the two rubber rings 8
An annular protrusion having a shape corresponding to the rubber ring 88 may be provided on the new branch joint 72 at the place where the rubber ring 8 is attached. By providing the projection integrally with the new branch joint 72 in advance, when the new branch joint 72 joined to the insertion pipe 16 is inserted into the existing sewage main pipe 12, the projection may come off from the new branch joint 72. And the insertion work can be performed smoothly. Each projection operates in the same manner as the rubber ring 88, and a description thereof will be omitted.

In FIG. 17, the new branch joint 72 is provided with rubber rings 88 and projections at two predetermined positions.
The epoxy resin can be surely spread over the entire area of the predetermined gaps 80 and 82 by other methods. That is, when forming the partition member 76, first, for example, an appropriate quick-drying resin (adhesive, sealing material, caulking material, etc.) is applied to the end of the existing sewage main pipe 12 shown in FIG. Gaps 82, 82
Is filled by applying a predetermined pressure to form a flow stopping member corresponding to the rubber ring 88 and the projection. However, a gap 90 as shown in FIG. 17 is formed between the inner surface of the existing sewage main pipe 12 and the flow stopping member. Next, the partition member 76 is formed by filling an epoxy resin having good fluidity. Thereby, the epoxy resin can be surely spread over the entire area of the predetermined gaps 80 and 82.

Further, the flange 70 of the fifth embodiment is similar to that of FIG.
As shown in FIG. 5, the lower end of the new branch pipe 78 is formed as an annular projection, but may have another shape. The point is that the peripheral edge 74a of the through hole 74 protruding inside the new branch joint 72 (see FIG. 14) is made to protrude outside the insertion tube 16 as shown in FIG. Any material can be used as long as it can be deformed. For example, a configuration may be provided in which protrusions (not shown) that protrude outward in the radial direction are provided at positions at predetermined angles along the outer periphery of the lower end edge of the new branch pipe 78.

In the branching method and the branching structure of the fifth embodiment, the partition member 76 shown in FIG. 16 may be omitted. The outer peripheral surface of the lower end of the new branch pipe 78 and the inner peripheral surface of the peripheral edge 74a of the through hole 74 formed in the new branch joint 72 are adhered to each other with an adhesive, and the joint between the two is sealed. Because there is. In the branching method and the branching structure of the fifth embodiment, the outer peripheral surface of the lower end of the new branch pipe 78 and the inner peripheral surface of the peripheral edge 74a of the through hole 74 formed in the new branch joint 72 are bonded with an adhesive. Although adhered to each other, this adhesive may be omitted. Of course, when the adhesive is omitted, the partition member 76 is not omitted.

In the first to fifth embodiments, the present invention is applied to an existing pipeline made of synthetic resin. However, the present invention is also applied to an existing pipeline made of, for example, cast iron or steel. Can be.

Further, in the first to fifth embodiments, the present invention is applied to the existing pipeline for sewage in which the pressure in the pipe is atmospheric pressure. The present invention can also be applied to existing pipelines for water supply or water supply. In this case, the existing branch joint 18
The connection between the steel pipe and the existing main pipe 12 and the existing branch pipe 14 may be not only rubber ring bonding but also adhesive bonding or other pressure-resistant bonding.

In the second embodiment, as shown in FIG. 7, the insertion tube 40 having the annular rib 44 formed on the outer surface and the new branch tube 42 are used. Instead of the insertion pipe 40 and the new branch pipe 42, an insertion pipe and a new branch pipe having a wavy cross section when cut in a direction passing through the center axis of the pipe and in a direction parallel to the center axis direction. May be used. Also in this case, the separation prevention ring 46 and the seal rubber 50 are mounted in annular grooves formed on the outer surfaces of the insertion tube 40 and the new branch tube 42.

In the fifth embodiment, as shown in FIG. 13, a new branch joint 72 having a through hole 74 formed in the main body portion 24a is used. However, the through hole 74 is formed instead. New branch joints may be used. In this case, first, the new branch joint joined to the insertion pipe 16 is inserted into the existing sewage main pipe 12 and arranged at the position of the existing branch pipe 14 as shown in FIG. Then, a drilling tool such as a hole saw is inserted from the existing branch pipe 14 to form a through hole 74 in the new branch joint.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an existing pipe to which a branch structure of the first embodiment shown in FIG. 3 of the present invention is applied.

FIG. 2 is a longitudinal sectional view showing a state in which an insertion pipe to be joined with a new branch joint is inserted into an existing sewage main pipe in a procedure for manufacturing the branch structure of the first embodiment.

FIG. 3 is a longitudinal sectional view showing a state where the branch structure according to the first embodiment of the present invention is completed.

4 (A) is a front view showing a novel branch joint used in the branch structure of the first embodiment of FIG. 3, and FIG. 4 (B) is FIG. 4 (A).
Is a plan view of the new branch joint shown in FIG. 4, and FIG. 4C is a side view of the new branch joint shown in FIG.

FIG. 5 is a longitudinal sectional view showing a state in which a new branch joint is inserted into an existing sewage main pipe while being joined to an insertion pipe in a procedure for manufacturing the branch structure of the first embodiment.

6 is a longitudinal sectional view showing a state in which an insertion pipe to be joined with a new branch joint is inserted into an existing sewage main pipe in a procedure for manufacturing the branch structure of the second embodiment shown in FIG. 7 of the present invention.

FIG. 7 is a longitudinal sectional view showing a state where a branch structure according to a second embodiment of the present invention is completed.

8 is a longitudinal sectional view showing a state in which an insertion pipe to be joined with a new branch joint is inserted into an existing sewage main pipe in a procedure for manufacturing the branch structure of the third embodiment shown in FIG. 9 of the present invention.

FIG. 9 is a longitudinal sectional view showing a state where a branch structure according to a third embodiment of the present invention is completed.

10A is a front view showing a new branch joint used in the branch structure of the third embodiment shown in FIG. 9, and FIG.
FIG. 10A is a plan view of the new branch joint shown in FIG.
It is a side view of the new branch joint shown to (A).

11 is a longitudinal sectional view showing a state in which an insertion pipe to be joined with a new branch joint is inserted into an existing sewage main pipe in a procedure for manufacturing the branch structure of the fourth embodiment shown in FIG. 12 of the present invention.

FIG. 12 is a longitudinal sectional view showing a state where a branch structure according to a fourth embodiment of the present invention is completed.

13 is a longitudinal sectional view showing a state in which an insertion pipe to be joined with a new branch joint is inserted into an existing sewage main pipe in a procedure for manufacturing the branch structure of the fifth embodiment shown in FIG. 16 of the present invention.

FIG. 16 is a longitudinal sectional view showing a state in which the lower end of the new branch pipe is inserted into the through hole of the new branch joint in the procedure for manufacturing the branch structure of the fifth embodiment.

FIG. 16 is a longitudinal sectional view showing a state where a new branch joint is pulled up in a procedure for manufacturing the branch structure of the fifth embodiment.

FIG. 16 is a longitudinal sectional view showing a state in which a gap between an existing branch joint and a new branch joint and a predetermined gap are filled with epoxy resin in a procedure for manufacturing the branch structure according to the fifth embodiment of the present invention, and the branch structure is completed. FIG.

FIG. 17 is a longitudinal sectional view showing an example in which a rubber ring is provided to prevent epoxy resin from flowing out of a gap between an existing sewage main pipe and a new branch joint in the branching method and the branching structure of the fifth embodiment of the present invention. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Existing pipe 12 ... Existing sewage main pipe 14 ... Existing branch pipe 16, 40 ... Insertion pipe 18 ... Existing branch joint 20, 54, 58, 64, 72 ... New branch joint 22, 42, 78 ... New branch pipe 24 ... the existing branch joint main body 24a ... the tubular part of the existing branch joint 32 ... the branch port 34 ... the through hole of the branch port 44 ... the rib 46 ... the separation prevention ring 50 ... the seal rubber 60 ... the spout 66 ... the projection 70 ... the flange Shaped part 74 ... through-hole 76 ... partition member 80, 82, 84, 86 ... gap

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takachi Harada 64 Ishizu-Kitamachi, Sakai-shi, Osaka, Japan Inside Kubota-Tavinyl Pipe Co., Ltd. F term (reference) 3H019 BA04 BB01 BB06 BB08

Claims (4)

[Claims] 1. An insertion pipe branch joint for inserting an insertion pipe into an existing pipe having a branch pipe and branching from the insertion pipe, the outer pipe having an outer diameter smaller than an inner diameter of the existing pipe, A branch joint for an insertion tube that has a branch port that protrudes inward. 2. A method for branching an insertion pipe using the insertion pipe branch joint according to claim 1, wherein: (a) the insertion pipe branch joint is located at a position corresponding to the branch pipe of the existing pipe. Attaching the insertion tube into the existing tube; and (b)
A method of branching from an insertion tube, comprising a step of inserting a new branch tube through the branch tube into the branch receiving port. 3. A branch structure of an insertion pipe using the branch joint for an insertion pipe according to claim 1, wherein said insertion pipe is inserted into said existing pipe, and said insertion pipe is inserted into said insertion pipe. A branch structure for an insertion tube, comprising: a branch joint for an insertion tube attached to a position corresponding to a branch tube; and a new branch tube inserted into the branch receiving port through the branch tube. 4. A method of inserting an insertion pipe into an existing pipe having a branch pipe and branching the insertion pipe, the method comprising: (a) mounting a straight socket at a position corresponding to the branch pipe in the existing pipe; Inserting the insertion pipe into the existing pipe while inserting the pipe end of the new branch pipe having a flange portion at the pipe end through a hole formed in the straight socket; And (c) raising the new branch pipe to project the periphery of the hole outward.
How to branch from the insertion tube.