JP2002340272A - Method for branching from insertion pipe and branch structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the trouble and cost for backfill by branching an insertion pipe to an existing branch pipe so as to eliminate the need of open-cut and backfill earth (road) on the existing pipeline. SOLUTION: Epoxy resin having fluidity is injected from an upper opening part of the existing branch pipe 16 to fill a gap 30 between a cylindrical part 18a of an existing branch joint 14 and an insert pipe 12 and the inside spaces 40, 16a of the existing branch joint 14 and the existing branch pipe 16 with the resin. After the resin is cured, an inner hole 34 and penetrating holes 36, 26 are formed in the insertion pipe 12 with the resin injected into the inside spaces 40, 16a and cured. Thus, a partition member 28 for sealing the inside spaces 12a, 16 can be formed with the inside space 12a of the insertion pipe 12 and the inside space 16a of the branch pipe 16 communicated with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branching method and a branching structure from an insertion tube, and more particularly to a branching method from an insertion tube used for rehabilitating (repairing) or renewing an existing deteriorated tube from the inside thereof. Method and branch structure.

[0002]

2. Description of the Related Art Conventionally, there is an insertion method for inserting an insertion pipe made of synthetic resin 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, since the new branch joint is larger than the inner diameter of the existing branch pipe, it cannot be passed through the existing branch pipe. Therefore, for example, soil (road) on the existing pipeline is cut and cut, and an opening is formed in the branch of the existing pipe, and a new branch joint is inserted from this opening to be 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.

[0004] Therefore, a main object of the present invention is to provide a method and structure for branching from an insertion tube, which requires less labor and cost.

[0005]

According to a first aspect of the present invention, there is provided a branching method in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the branch pipe is branched from the insertion pipe at the branch pipe. Filling the resin into the gap between the existing pipe and the insertion pipe and the inside of the branch pipe by injecting the resin from the pipe, (b) curing the resin, and
(c) A method of branching from an insertion tube, including a step of perforating the insertion tube together with a resin that has been filled and hardened in the branch tube and gaps.

A second invention is a branching method in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the insertion pipe is branched from the insertion pipe at the branch pipe. Drilling step, (b) aligning the hole in the branch pipe and inserting a new branch pipe, (c) injecting resin from the gap between the branch pipe and the new branch pipe, and connecting the existing pipe and the insertion pipe. And filling the gap between the branch pipe and the new branch pipe with a resin, and (d) curing the resin.

A third aspect of the present invention is a branch structure in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the branch pipe branches from the insertion pipe at a portion of the branch pipe. And a partition member formed of a resin filled and cured inside the gap between the insertion pipe and the branch pipe, and a hole penetrating from the portion formed in the branch pipe of the partition member to the insertion pipe, It is a branched structure from the insertion tube.

A fourth aspect of the present invention is a branch structure in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the insertion pipe is branched from the insertion pipe at a branch pipe portion. A new branch pipe inserted into the hole, the branch pipe in alignment with the hole, and resin is injected from the gap between the branch pipe and the new branch pipe, and the gap between the existing pipe and the insertion pipe, and the branch pipe and the new branch. This is a branched structure from the insertion tube, including a partition member formed of a cured resin filled in a gap with the tube.

A fifth invention is a branching method in which an insertion pipe is inserted into an existing pipe having a branch pipe and the branch pipe is branched from the insertion pipe. Drilling, (b) inserting the pipe end of the new branch pipe having a flange at the pipe end through the hole and inserting it inside, and (c) raising the new branch pipe to project the periphery of the hole outward. A method of branching from an insertion tube, the method including a step of causing the insertion tube to branch.

[0010]

According to the method of branching from an insertion tube of the first invention, the insertion tube is pierced together with the cured resin filled in the inside of the branch tube and in the gap between the existing tube and the insertion tube, thereby forming the insertion tube. The inner space of the pipe and the inner space of the branch pipe can communicate with each other. Since the cured resin is bonded to the inner surface of the existing pipe and the branch pipe in a state of being in close contact with the outer surface of the insertion pipe, the gap between the existing pipe and the insertion pipe, the insertion pipe and the branch pipe are formed. It becomes a partition member between each inner space of the pipe, and both can be partitioned in a sealed state. Thereby, it is possible to branch from the insertion pipe to the existing branch pipe at the existing branch pipe.

According to the method of branching from an insertion tube of the second invention, first, a new branch tube is inserted into the branch tube and aligned with a hole formed in the insertion tube. In this state, a resin is filled into a gap between the existing pipe and the insertion pipe and a gap between the branch pipe and the new branch pipe, and the resin is cured. With the cured resin, the inner space of the insertion pipe and the inner space of the new branch pipe are connected to each other, and the joint between the insertion pipe and the new branch pipe can be sealed, and both are firmly connected to each other. Can be combined. Then, the insertion pipe and the new branch pipe can be firmly connected to the existing pipe and the existing branch pipe. In this way, it is possible to branch from the insertion pipe to the new branch pipe at the existing branch pipe.

According to the branch structure from the insertion tube of the third invention, the resin having fluidity is injected from the branch tube, and the gap between the existing tube and the insertion tube and the inside of the branch tube are filled with the resin. Since the partition member is formed, for example, the partition member can be formed in a state attached to the insertion pipe without cutting the soil (road) on the existing pipeline. This partition member is the first
Since it operates in the same manner as the perforated and cured resin of the invention of the second aspect, the description thereof is omitted.

[0013] According to the branch structure from the insertion pipe of the fourth invention, the resin is injected from the gap between the existing branch pipe and the new branch pipe, and the gap between the existing pipe and the insertion pipe and the existing branch pipe are injected. A partition member is formed by filling a gap with the new branch pipe with a resin. Thus, for example, the partition member can be formed in a state of being attached to the insertion pipe and the new branch pipe without cutting the soil (road) on the existing pipeline. Since this partition member operates in the same manner as the cured resin of the second invention, its description is omitted.

According to the method of branching from an insertion pipe of the fifth invention, the pipe end of the new branch pipe having a flange portion at the pipe end is passed through a hole formed in the insertion pipe, and the inside of the insertion pipe is inserted. Insert into Then, pull up the new branch pipe, push up the periphery of the hole by the flange, and deform it,
This causes the periphery to protrude outside the insertion tube. 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 insertion tube are in close contact with each other, and the contact portion is sealed by the elastic force of the tube wall of the insertion tube.

[0015]

According to the present invention, 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.

According to the first and third aspects,
The old pipe can be rehabilitated and renewed from the inside by the insertion pipe. According to the second, fourth and fifth inventions, the existing aging pipe and the aging branch pipe can be rehabilitated and renewed from the inside thereof by the insertion pipe 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 the embodiments with reference to the drawings.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a branch structure (hereinafter sometimes simply referred to as "branch structure") from an insertion tube according to a first embodiment of the present invention is, for example, an existing pipe 10 buried. In order to rehabilitate or renew old sewage mains (hereinafter referred to as “existing sewage mains”) 11 from the inside,
As shown in FIG. 4, the present invention can be applied to an insertion method in which an insertion pipe 12 is inserted into an existing sewage main pipe 11. The existing pipe 10 includes an existing sewage main pipe 11, a sewage branch joint (hereinafter referred to as “existing branch joint”) 14, and a sewage branch pipe (hereinafter referred to as “existing branch pipe”) 16. . According to this branching structure, as shown in FIG.
When the existing branch pipe 16 is connected via the pipe, it is branched from the insertion pipe 12 without cutting or backfilling the soil (road) on the existing pipe, and the space inside the insertion pipe 12 is formed. 12a and the inner space 16a of the existing branch pipe 16 can be connected.

The existing branch joint 14, as shown in FIG.
A body 18 having an inner space is provided. This body 18
In each of the left and right ends, rubber ring sockets 20, 20 are formed, and the existing sewer main pipes 11, 11 are joined to the left and right rubber ring sockets 20, 20, respectively. The inner diameter of the cylindrical portion 18a of the main body 18 that is in contact with each end of the left and right existing sewage main pipes 11 is the same as the inner diameter of the existing sewage main pipe 11. In addition, a branch rubber ring socket 22 is formed in the upper part of the main body 18, and the existing branch pipe 16 is joined to the branch rubber ring socket 22. The main body 1 abutted against the lower end of the existing branch pipe 16
The inner diameter of the upper cylindrical portion 18 b of the eighth branch pipe 8 is substantially the same as the inner diameter of the existing branch pipe 16.

The existing sewage main pipes 11, 11, the existing branch joint 14, and the existing branch pipe 16 are buried under the road, and are made of synthetic resin such as vinyl chloride, polyethylene, and polybutene. The existing sewer main 1 shown in FIG.
1 and the rubber ring socket 20, and the respective junctions of the existing branch pipe 16 and the branch rubber ring socket 22 are bonded and bonded by an adhesive, and are sealed by a rubber ring.

As shown in FIG. 4, the insertion pipe 12 is a cylindrical body having an outer diameter smaller than the inner diameter of the existing sewage main pipe 11, and is made of a synthetic resin such as vinyl chloride, polyethylene, or polybutene. This insertion tube 12
It is inserted to rehabilitate and renew the existing sewage main pipe 11 from the inside. Further, a through hole 26 is formed at an upper portion of a tube wall at a predetermined position of the insertion tube 12. The central axes of the through hole 26 and the existing branch pipe 16 are on the same straight line. The diameter of the through hole 26 is smaller than the inner diameter of the existing branch pipe 16. Reference numeral 28 shown in FIG. 4 is a partition member.

As shown in FIG. 4, the partition member 28 includes a first tubular portion 28a and a second tubular portion 28b.
For example, they are integrally formed of epoxy resin. The first tubular portion 28a is provided with a gap 30 formed between the tubular portion 18a of the branch joint main body 18 and the insertion pipe 12, and an end of each of the left and right existing sewage main pipes 11 and the insertion pipe 12. Is filled with an epoxy resin to form a predetermined thickness. The second tubular portion 28b is formed to have a predetermined thickness in close contact with the inner surfaces of the upper tubular portion 18b of the branch joint main body 18 and the lower end of the existing branch pipe 16, and is made of epoxy resin. is there. Then, through holes 36 and 26 are formed so as to coincide with the central axis of the inner hole 34 of the second cylindrical portion 28b of the partition member 28. The through hole 36 is formed in the first cylindrical portion 28a, and the through hole 26 is formed in the insertion tube 12. The inner space 1 of the insertion tube 12 is formed through the inner hole 34 and the through holes 36 and 26 of the second cylindrical portion 28b.
2a and the inner space 16a of the existing branch pipe 16 communicate with each other. The partition member 28 is in close contact with the inner surface of the end of each of the existing sewer main pipes 11, 11, the inner surface of the branch joint body 18, the inner surface of the lower end of the existing branch pipe 16, and the outer surface of the insertion pipe 12. Are joined.

As a result, the partition member 28 has a cylindrical space 38 between the inner space 12a of the insertion pipe 12 and the inner space 16a of the existing branch pipe 16, and the existing sewage main pipe 11 and the insertion pipe 12. 38, and both are sealed in a sealed state. The second tubular portion 28b of the partition member 28 is fitted and connected to the upper tubular portion 18b of the existing branch joint 14 and the lower end of the existing branch pipe 16, and the first tubular portion 28a is Since the branch joint body 18 is connected to the end of the existing sewage main pipe 11 and the insertion pipe 12, the insertion pipe 1
2 can be reliably held so as not to be displaced in the axial direction of the existing sewage main pipe 11, and can be held so that the second tubular portion 28b does not come off from the upper tubular portion 18b of the branch joint main body 18. . With the branching structure formed in this way, the portion of the existing branch joint 14 (the portion of the existing branch tube 16) is branched from the insertion tube 12 to the existing branch tube 16.

Next, a method of branching from the insertion tube for manufacturing the branch structure shown in FIG. 4 will be described with reference to FIGS. Now, as shown in FIG. 1, an existing branch pipe 16 is connected to the buried existing sewer main pipes 11, 11 via an existing branch joint 14. The existing branch pipe 16 is connected to, for example, a house house or a public house (not shown). First, as shown in FIG. 2, the insertion pipe 12 is inserted into the existing sewage main pipe 11, the tubular portion 18 a of the existing branch joint 14, and the existing sewage main pipe 11. This insertion tube 1
Although not shown in the drawing, 2 is easily inserted when it is heated to a predetermined temperature and inserted from a manhole or the like in a flexible state. The insertion pipe 12 is naturally cooled and hardened while being inserted into the existing sewer main pipe 11 and the existing branch joint 14, and in this hardened state, the insertion pipe 12, the end of the existing sewer main pipe 11 and Cylindrical part 18 of branch joint body 18
It is held by a holding portion (not shown) such that the respective central axes of a are substantially coincident. In this state, cylindrical gaps 32, 30 are formed between the end of the existing sewage main pipe 11 and the insertion pipe 12, and between the tubular portion 18a of the branch joint main body 18 and the insertion pipe 12. ing.

Next, as shown in FIG.
A gap 30 formed between the branch joint body 18 and the insertion tube 12 by injecting, for example, an epoxy resin having a fluidity from the upper opening portion at a predetermined pressure.
Each existing sewage main pipe 11 joined to each left and right rubber ring socket 20
This resin is filled into the gaps 32, 32 formed between the end of the insertion pipe 12 and the inner space 40 of the existing branch joint 14 up to the height reaching the lower end of the existing branch pipe 16. Then, when the filled epoxy resin having fluidity is hardened after the elapse of a predetermined time, the partition block 42 is formed. Thereafter, a drilling tool is inserted into the existing branch pipe 16 and the partition block 4 is inserted.
The inner hole 34 and the through holes 36 and 26 penetrating from the center of the upper surface of the columnar portion 42a formed in the inner space 40 and the like of the second existing branch pipe 16 to the insertion pipe 12 are formed using this drilling tool. (See FIG. 4). The inner hole 34 and the through holes 36 and 26 have an inner diameter slightly smaller than the diameter of the columnar portion 42a, the through hole 36 is formed in the first cylindrical portion 28a, and the through hole 26 is formed in the insertion tube 12a. Is formed. The partition block 42 in which the through holes 34, 36, 26 are formed is the partition member 28. Thus, the fabrication of the branch structure from the insertion tube 12 is completed.

Here, an epoxy resin is used as a material for forming the partition member 28, but 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 30, 32 and the space 40 can be easily spread, and the gaps 30, 32 and the space 40 can be reliably hermetically and water-tightly sealed in a hardened state. It is preferable to use an adhesive, a sealing material, a caulking material, or the like having excellent adhesion to the sewage main pipe 11, the existing branch pipe 16, the existing branch joint 14, and the insertion pipe 12. Therefore, it is preferable to use a resin adhesive or the like of an appropriate material according to the materials of the existing sewage main pipe 11, the existing branch pipe 16, the existing branch joint 14, and the insertion pipe 12.

According to the branching method and the branching structure from the insertion tube, the epoxy resin having fluidity is injected from the existing branching tube 16 so that the tubular portion 18a of the branch joint main body 18 and the insertion tube 12 are connected. The gap 30 formed therebetween, the gap 32 formed between the end of each left and right existing sewage main pipe 11 and the insertion pipe 12, and the existing gap up to the height reaching the end of the existing branch pipe 16. The partition member 28 can be formed by filling the branch joints 14 and the inner spaces 40 and 16a of the existing branch pipe 16 with this resin and further providing the inner holes 34 and the through holes 36. In this manner, the partition member 28 can be formed in a state in which the partition member 28 is closely attached to the insertion tube 12 or the like.

This allows the insertion pipe 12 to be branched into the existing branch pipe 16 at the existing branch joint 14 without digging or backfilling the soil (road) or the like on the existing pipe 10. Can be. Therefore, the labor and cost for branching from the insertion tube 12 can be reduced as compared with the related art.

In the branch structure shown in FIG. 4, the insertion tube 12 itself can have mechanical strength and the like as a fixed structure for passing a fluid (or gas). Further, the mechanical strength and the like can be provided by a combination of the insertion pipe 12 and the existing sewage main pipe 11. That is, the existing sewage main pipe 11 can be updated or rehabilitated by the insertion pipe 12.

Next, referring to FIG. 8, a description will be given of a branch structure (hereinafter, may be simply referred to as a "branch structure") from the insertion tube of the second embodiment. The branch structure of the second embodiment shown in FIG. 8 is different from the first embodiment shown in FIG. 4 in that a new branch pipe 44 whose outer diameter is smaller than the inner diameter of the existing branch pipe 16 is inserted inside the existing branch pipe 16. The outer peripheral surface of the lower end of the new branch pipe 44 is joined to the inner peripheral surface of the second tubular portion 28b of the partition member 28 in a state of being in close contact therewith. Tube 1
2 is in contact with the outer surface. Therefore, the through holes 46 formed in the tube wall of the insertion tube 12 of the second embodiment.
The inner diameter of the new branch pipe 44 is smaller than the inner diameter of the through hole 26 formed in the insertion tube 12 of the first embodiment. In contact. FIG. 7 shows a through hole 46 in which the lower end surface of the new branch pipe 44 is formed in the insertion pipe 12.
The state of contact with the upper surface of the peripheral edge of
FIG. 3 is a longitudinal sectional view as viewed from the axial direction of FIG. As can be seen from this vertical cross-sectional view, the lower end surface of the new branch pipe 44 is formed in an inwardly curved shape along the outer surface of the insertion pipe 12.

As described above, the lower end surface of the new branch pipe 44 is held by the upper surface of the peripheral edge forming the through hole 46, and the outer peripheral surface of the new branch pipe 44 is held by the second cylindrical portion 28 of the partition member 28.
b, it is held in a state of being connected to the inner peripheral surface of the new branch pipe 44. Can be prevented. The second tubular portion 28b of the partition member 28 is provided with the inner spaces 44a, 12a of the new branch pipe 44 and the insertion pipe 12, and the cylindrical gap 48 between the existing branch pipe 16 and the new branch pipe 44. , And both spaces are sealed off.

According to this branching structure, similarly to the first embodiment, the inside space 12a of the insertion tube 12 and the existing branching line can be removed without cutting or backfilling the soil (road) on the existing pipe 10, for example. The inner space 44a of the new branch pipe 44 inserted into the pipe 16 can be communicated with each other. With the branch structure formed in this way, the insertion pipe 12 is branched to the new branch pipe 44 at the existing branch joint 14 (the existing branch pipe 16). Then, the insertion pipe 1 is inserted into the existing sewer main pipe 11.
2, the existing sewage main 11
Can be updated or rehabilitated. And the existing branch pipe 16 can also be renewed or rehabilitated by inserting the new branch pipe 44 into the existing branch pipe 16. However, in the first embodiment, since the new branch pipe 44 is not inserted into the existing branch pipe 16, the existing branch pipe 16 is not updated or renewed. Otherwise, the structure is the same as the branch structure of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof will be omitted.

Next, referring to FIGS. 1, 5 to 8, FIG.
A method of branching from an insertion tube for manufacturing the branch structure shown in FIG. As shown in FIG. 1, an existing branch pipe 16 is connected to a buried existing sewage main pipe 11 via an existing branch joint 14, as shown in FIG. First, as shown in FIG. 5, the insertion pipe 12 is inserted into the existing sewage main pipe 11, the tubular portion 18 a of the existing branch joint 14, and the existing sewage main pipe 11. Insertion tube 12
Are inserted into the existing sewage main pipe 11 and the existing branch joint 14, and the insertion pipe 12, the existing sewage main pipe 1
The end portion 1 and the central axis of the cylindrical portion 18a of the branch joint main body 18 are held by a holding portion (not shown) such that they substantially coincide with each other. In this state, cylindrical gaps 32, 30 are formed between the end of the existing sewage main pipe 11 and the insertion pipe 12, and between the tubular portion 18a of the branch joint main body 18 and the insertion pipe 12. ing.

Next, a drilling tool such as a hole saw is inserted into the existing branch pipe 16, and a through hole 46 is formed in the upper part of the pipe wall of the insertion pipe 12 as shown in FIG. Formed. The center axis of the through-hole 46 coincides with the center axis of the existing branch pipe 16, and the inner diameter is smaller than the inner diameter of the new branch pipe 44 (see FIG. 8).

Next, as shown in FIG.
A new branch pipe 44 having an outer diameter smaller than the inner diameter is inserted into the existing branch pipe 16, and the lower end surface of the new branch pipe 44 is aligned with the upper surface of the peripheral edge of the through hole 46 and pressed. In this pressed state, the central axes of the new branch pipe 44 and the through-hole 46 coincide. In addition, new branch pipe 4
As shown in FIG. 7, the lower end surface of 4 has an inwardly curved shape, and the entire lower end surface is in close contact with the upper surface of the peripheral edge of the through hole 46 formed in the insertion tube 12. .

Next, as shown in FIG.
For example, epoxy resin having fluidity is injected at a predetermined pressure from the upper opening of the gap 48 between the insertion pipe 12 and the insertion pipe 12. The gap 30 formed, the gap 32 formed between the end of each of the left and right existing sewage main pipes 11 and the insertion pipe 12, and the existing branch pipe 16, the existing branch joint 14, and the new branch pipe 44 This resin is filled into the inner space up to the height reaching the lower end of the existing branch pipe 16 in the gap 48 of the existing branch pipe 16.

When the epoxy resin is filled, the lower end surface of the new branch pipe 44 is pressed against the outer surface of the insertion pipe 12 with a predetermined force, and the epoxy resin flows into the insertion pipe 12 from the joint. It is necessary to avoid. Of course, the lower end surface of the new branch tube 44 and the outer surface of the insertion tube 12 may be bonded with an adhesive. Then, when the filled epoxy resin having fluidity is hardened by the lapse of a predetermined time, the partition member 2
8 are formed. This completes the fabrication of the branch structure from the insertion tube.

Here, an epoxy resin is used as a material for forming the partition member 28, but as in the first embodiment,
An adhesive, a sealing material, a caulking material, or the like may be used as the other resin depending on the material of the existing branch joint 14 or the like.

According to the above-described method and structure for branching from the insertion tube, the existing branch tube 16 and the new branch tube 4
Epoxy resin having fluidity is injected from the upper opening of the gap 48 with the gap 4, and the gap 30 formed between the cylindrical portion 18a of the branch joint main body 18 and the insertion tube 12;
A gap 32 formed between the end of each existing sewage main pipe 11 and the insertion pipe 12, and the existing branch pipe 16
And a gap 48 between the existing branch joint 14 and the new branch pipe 44
By filling the inner space up to the height reaching the lower end of the existing branch pipe 16 with this resin, the partition member 2
8 can be formed. In this manner, the partition member 28 can be formed in a state of being closely attached to the insertion tube 12 and the new branch tube 44.

Thus, in a state where the inner space 12a of the insertion pipe 12 and the inner space 44a of the new branch pipe 44 are communicated with each other, the junction between the insertion pipe 12 and the new branch pipe 44 is separated by the partition member 28. They can be sealed and can be firmly connected to each other.
These can be firmly connected to the existing sewage main pipe 11, the existing branch joint 14, and the existing branch pipe 16 by the partition member 28.

Therefore, as in the first embodiment, the insertion pipe 12 is connected to the new branch pipe 44 at the existing branch joint 14 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 12 can be reduced as compared with the related art.

In the branch structure shown in FIG. 8, each of the insertion tube 12 and the new branch tube 44 can have mechanical strength and the like as a fixed structure for passing a fluid (or gas). Further, the mechanical strength and the like may be provided by a combination of the insertion pipe 12 and the existing sewage main pipe 11 and a combination of the existing branch pipe 16 and the new branch pipe 44. That is,
The existing sewage main pipe 11 and the existing branch pipe 16 can be updated or rehabilitated by the insertion pipe 12 and the new branch pipe 44.

Next, a branch structure from the insertion tube of the third embodiment (hereinafter sometimes simply referred to as "branch structure") will be described with reference to FIG. The third shown in FIG.
The branch structure of the embodiment is different from that of the first embodiment shown in FIG.
A new branch pipe 52 whose outer diameter is smaller than the inner diameter of the existing branch pipe 16 is inserted inside the existing branch pipe 16, and the outer peripheral surface of the lower end of the new branch pipe 52 is partitioned into the second cylindrical portion 2 of the partition member 28.
8b in a state of being closely adhered to the inner peripheral surface of 8b. The peripheral edge 54a of the through hole 54 formed in the tube wall of the insertion tube 12 is bent in a state of protruding outside the insertion tube 12, and is embedded in the partition member 28. I have. Peripheral edge 5 of this through hole 54
The inner diameter of 4a matches the inner diameter of the second tubular portion 28b of the partition member 28.

The lower end of the new branch pipe 52 is inserted into the through-hole 54, and the outer peripheral surface of the lower end is inserted into the through-hole 5.
4 inner surface (inner surface of insertion tube 12)
Are bonded via an adhesive in a state of being in close contact with. Further, an annular flange 56 is formed on the periphery of the lower end of the new branch pipe 52.
The outer peripheral edge on the upper side of the flange portion 56 is in contact with the inner surface of the bent portion of the peripheral edge 54 a forming the through hole 54. Therefore, the inner diameter of the through hole 54 formed in the insertion tube 12 of the third embodiment is the same as that of the insertion tube 12 of the first embodiment in the state shown in FIG. 9 before the new branch tube 52 is inserted. The size is smaller than the inner diameter of the formed through hole 26. The lower end surface and the flange portion 56 of the new branch pipe 52 are formed in an inwardly curved shape along the inner surface of the insertion tube 12, as in the second embodiment.

As described above, the outer peripheral surface of the lower end portion of the new branch pipe 52 is held in a state of being adhered to the inner peripheral surface of the peripheral edge 54a forming the through hole 54, and the outer peripheral surface of the upper portion is further partitioned. It is held in a state of being connected to the inner peripheral surface of the second cylindrical portion 28b of the member 28. Accordingly, it is possible to prevent the positional deviation of the respective central axes with respect to the through hole 54 of the new branch pipe 52 in the direction away from each other and the positional deviation in the central axis direction. And the second of the partition member 28
The cylindrical portion 28b serves as a partition between the inner spaces 52a, 12a of the new branch pipe 52 and the insertion pipe 12 and the cylindrical gap 48 between the existing branch pipe 16 and the new branch pipe 52. The space is partitioned in a sealed state.

According to this branching structure, similarly to the first embodiment, the inside space 12a of the insertion pipe 12 and the existing branching pipe are not cut and backfilled, for example, on the existing pipe 10 without dirt (road). The inner space 52a of the new branch pipe 52 inserted into the pipe 16 can communicate with each other. With the branching structure formed in this way, the portion of the existing branch joint 14 (the portion of the existing branch pipe 16) is branched from the insertion pipe 12 to the new branch pipe 52.
The insertion of the insertion pipe 12 into the existing sewage main pipe 11 allows the existing sewage main pipe 11 to be renewed or renewed, and the new branch pipe 52 to be inserted into the existing branch pipe 16. With this configuration, the existing branch pipe 16 can also be updated or rehabilitated. Otherwise, the structure is the same as the branch structure of the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof will be omitted.

Next, with reference to FIGS. 1 and 9 to 11, a method of branching from the insertion tube for manufacturing the branch structure shown in FIG. 11 will be described. Now, as shown in FIG.
As in the embodiment, the existing branch pipe 16 is connected to the buried existing sewer main pipe 11 via the existing branch joint 14.
First, as shown in FIG. 9, the insertion pipe 12 is inserted into the existing sewage main pipe 11, the tubular portion 18 a of the existing branch joint 14, and the existing sewage main pipe 11. Insertion tube 12
Are inserted into the existing sewage main pipe 11 and the existing branch joint 14, and the insertion pipe 12, the existing sewage main pipe 1
The end portion 1 and the central axis of the cylindrical portion 18 of the branch joint main body 18 are held by a holding portion (not shown) such that they substantially coincide with each other. In this state, between the existing sewage main pipe 11 and the insertion pipe 12, and the cylindrical portion 1 of the branch joint main body 18,
8a and the cylindrical gap 3 between the insertion tube 12
2, 30 are formed.

Next, a drilling tool such as a hole saw is inserted into the existing branch pipe 16, and a through hole 54 is formed in the upper part of the pipe wall of the insertion pipe 12, as shown in FIG. Formed. The through hole 54 and the existing branch pipe 1
The central axis of 6 is on the same axis, and the inner diameter of the through hole 54 is smaller than the inner diameter of the new branch pipe 52.

Next, as shown in FIG.
The new branch pipe 52 having an outer diameter smaller than the inner diameter of 6 is inserted into the existing branch pipe 16, and the lower end of the new branch pipe 52 is inserted into the insertion pipe 12 through the through hole 54. At this time, the peripheral edge 54a of the through hole 54 is expanded in diameter and bent and deformed toward the inside of the insertion tube 12,
It is in a protruding state. The inner peripheral surface of the through hole 54 (the outer surface of the insertion tube 12) is
In close contact with the outer peripheral surface. However, this new branch pipe 52
An adhesive is applied to the outer peripheral surface of the lower end of the.

Next, as shown in FIG. 11, the new branch pipe 52 at the lowered position is pulled up. At this time, the flange portion 5 formed at the lower end of the new branch pipe 52 is formed.
6 deforms the peripheral edge 54 a of the through hole 54 protruding toward the inside of the insertion tube 12 and raises the peripheral edge 54 a upward, so that the peripheral edge 54 a is deformed to protrude outside the insertion tube 12. In this state, the outer peripheral surface of the lower end of the new branch pipe 52 is
a (the inner surface of the insertion tube 12)
It is joined to the inner surface of the new branch pipe 52 via an adhesive applied to the outer peripheral surface of the lower end portion. Through hole 54
The inner peripheral surface of the insertion tube 12 and the outer peripheral surface of the new branch pipe 52 are hermetically sealed by the elastic force of the tube wall of the insertion tube 12 and the adhesive. The flange portion 56 of the new branch pipe 52 has a shape curved inwardly in an arc shape, and the entire outer edge on the upper side thereof is formed by bending the peripheral edge 54 a of the through hole 54 formed in the insertion tube 12. It adheres to the inner surface.

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 48 between the tube 6 and the new branch pipe 52 at a predetermined pressure, and the gap between the cylindrical portion 18a of the branch joint main body 18 and the insertion pipe 12 is formed. , A gap 32, 32 formed between the end of each of the left and right existing sewage main pipes 11 and the insertion pipe 12, and a new branch with the existing branch pipe 16 and the existing branch joint 14. This resin is filled in the gap 48 between the pipe 52 and the inner space up to the height reaching the lower end of the existing branch pipe 16. Then, when the filled epoxy resin having fluidity is cured after a predetermined time has elapsed, the partition member 28 is formed. Thus, the fabrication of the branch structure from the insertion tube 12 is completed.

Here, epoxy resin is used as a material for forming the partition member 28, but similar to the first embodiment,
An adhesive, a sealing material, a caulking material, or the like may be used as the other resin depending on the material of the existing branch joint 14 or the like.

According to the branching method and the branching structure from the insertion pipe 12, the epoxy resin having fluidity is injected from the upper opening of the gap 48 between the existing branching pipe 16 and the new branching pipe 52, and the branch joint main body is formed. 18 cylindrical portion 18a
3 formed between the insertion tube 12 and
0, end of each existing sewer main pipe 11 and insertion pipe 12
And the gap 48 between the existing branch pipe 16 and the existing branch joint 14 and the new branch pipe 52, and the inner space up to the height reaching the lower end of the existing branch pipe 16. Is filled, the partition member 28 can be formed. Thereby, the partition member 28 can be formed in a state of being closely attached to the insertion tube 12 and the new branch tube 52.

In this manner, with the inner space 12a of the insertion tube 12 and the inner space 52a of the new branch pipe 52 communicating with each other, the joint between the insertion pipe 12 and the new branch pipe 52 is partitioned by the partition member 28. Can be tightly bonded to each other. These can be firmly connected to the existing sewage main pipe 11, the existing branch joint 14, and the existing branch pipe 16 by the partition member 28.

Therefore, similarly to the first embodiment, the insertion pipe 12 is connected to the new branch pipe 52 at the existing branch joint 14 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 12 can be reduced as compared with the related art.

In the branch structure shown in FIG. 11, each of the insertion pipe 12 and the new branch pipe 52 can have mechanical strength and the like as a fixed structure for passing a fluid (or gas). Further, the mechanical strength and the like may be provided by a combination of the insertion pipe 12 and the existing sewage main pipe 11 and a combination of the existing branch pipe 16 and the new branch pipe 52. That is, the existing sewage main pipe 11 and the existing branch pipe 16 can be updated or rehabilitated by the insertion pipe 12 and the new branch pipe 52.

However, in the first to third embodiments,
As shown in FIG. 3, FIG. 8 and FIG.
The epoxy resin is filled at a predetermined pressure in the gaps 32 and 30 between each end portion and the cylindrical portion 18a of the branch joint main body 18 and the insertion pipe 12, and has the filled fluidity. In order to ensure that the epoxy resin spreads over the entire area of the predetermined gaps 32 and 30 as shown in the respective figures, and to connect each end of the existing sewage main pipe 11 to the insertion pipe. Gap 3 between 12
In order to make it difficult to flow out of the predetermined locations 2 and 32 to the outside, even if rubber rings (flow-stopping members) 60 and 60 shown in FIG. Good. Before the rubber ring 60 is inserted into the existing sewer main pipe 11,
The insertion tube 12 may be attached to its outer peripheral surface at two predetermined positions shown in FIG.
Alternatively, an annular groove is provided on the outer peripheral surface of the insertion tube 12 and fitted into the groove. Then, the insertion pipe 12 is inserted into the existing sewage main pipe 11, and the rubber rings 60 are arranged, for example, at positions corresponding to the respective ends of the existing sewage main pipe 11, as shown in FIG. 12. Thereafter, the epoxy resin is filled at a predetermined pressure as described in each embodiment. At this time, the air displaced by the filled epoxy resin flows out from the gap 62 between the inner surface of the existing sewage main pipe 11 and the rubber ring 60 shown in FIG. 12 to the gap 38 side. The rubber ring 60 closes the gap and suppresses the outflow from the gap 62. Thereby, as shown in FIGS. 3, 8 and 11, the epoxy resin can be surely spread over the entire area of the predetermined gaps 30 and 32.

In FIG. 12, the insertion tube 1
2, the rubber ring 60 is attached to two predetermined positions. Alternatively, as shown in FIG. 13, an annular shape corresponding to the rubber ring 60 is provided at the position where the two rubber rings 60 are attached. May be provided on the insertion tube 12. The projection 64 is inserted into the insertion tube 1 in advance.
2 and the insertion tube 1
When the 2 is inserted into the existing sewer main pipe 11, the projection 64 does not come off from the insertion pipe 12, and the insertion work can be performed smoothly. The insertion tube 12 shown in FIG. 13 has a large number of annular ribs 66 formed on the outer peripheral surface. The height of each rib 66 is smaller than the height of the projection 64. Each projection 64 is provided with a rubber ring 6.
Since it operates in the same way as 0, its description is omitted.

In FIGS. 12 and 13, the rubber ring 60 and the projection 64 are provided at two predetermined positions of the insertion tube 12, but the epoxy resin may be formed in a predetermined manner by other methods. It can be ensured that the whole of the range of 30, 32 is spread. That is, when forming the partition member 28, 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 11 shown in FIG. 3, FIG. 8 and FIG. A predetermined pressure is applied to gaps 32, 32 between the gasket and the insertion tube 12 to fill the gaps, thereby forming a flow stopping member corresponding to the rubber ring 60 and the projection 64. However, a gap 62 as shown in FIG. 12 is formed between the inner surface of the existing sewage main pipe 11 and the flow stopping member. Next, the partition member 28 is formed by filling an epoxy resin having good fluidity. Thereby, the epoxy resin can be surely spread over the entire area within the predetermined gaps 30 and 32.

Further, in the second embodiment, as shown in FIGS. 6 and 7, the lower end face of the new branch pipe 44 is brought into direct contact with the outer face of the insertion pipe 12. As shown in FIG. 14, an annular soft member 68 made of soft rubber, for example, sponge rubber, is provided on the lower end surface of the new branch pipe 44.
May be attached by bonding. By attaching the annular soft member 68 to the lower end face of the new branch pipe 44 in this manner, the lower end face of the new branch pipe 44 and the insertion pipe 12
Can be sealed by the soft member 68 so that the filled epoxy resin does not flow into the insertion tube 12 through the joint. The new branch pipe 44 is pressed against the insertion pipe 12, and the soft member 68
Is compressed, the epoxy resin does not pass through the compressed soft member 68.

Further, in the second embodiment, as shown in FIGS. 6 and 7, the lower end face of the new branch pipe 44 is brought into direct contact with the outer face of the insertion pipe 12. As shown in FIG. 15, the lower end of the new branch pipe 44 may be fitted and attached to the periphery of the through hole 70 formed in the insertion pipe 12. That is, a small-diameter portion 72 having an outer diameter smaller than the outer diameter of the new branch pipe 44 is formed at the lower end of the new branch pipe 44, and a rubber ring 74 is attached to the outer periphery of the small-diameter section 72. The outer diameter of the small diameter portion 72 is substantially equal to the inner diameter of the through hole 70. The state shown in FIG.
2 is inserted into the through hole 70, and the rubber ring 74 is sandwiched between the lower surface 76 of the step formed at the upper end of the small diameter portion 72 and the outer surface of the insertion tube 12. As a result, the joint between the lower end of the new branch pipe 44 and the periphery of the through hole 70 formed in the insertion tube 12 can be sealed by the rubber ring 74, and the filled epoxy resin can be sealed with the joint. Through the inside of the insertion tube 12. Since the small-diameter portion 72 is fitted into the through-hole 70, the mounting position of the new branch pipe 44 with respect to the through-hole 70 can be reliably determined, and the partition member 28 having a predetermined shape can be reliably formed. can do.

The flange 56 of the third embodiment is similar to that of FIG.
As shown in FIG. 1, the new branch pipe 52 is formed as an annular projection on the lower edge of the new branch pipe 52, but may have another shape. In short, the through hole 54 protruding inside the insertion tube 12
When the new branch pipe 52 is pulled up by its peripheral edge 54a (see FIG. 10), as shown in FIG.
What is necessary is just to be able to be deformed so that it may protrude outside of 2. For example, a configuration may be provided in which protrusions (not shown) projecting outward in the radial direction are provided at positions at predetermined angles along the outer circumference of the lower end edge of the new branch pipe 52.

In the branching method and the branching structure of the third embodiment, the partition member 28 shown in FIG. 11 may be omitted. The outer peripheral surface of the lower end of the new branch pipe 52 and the inner peripheral surface of the peripheral edge 54a of the through hole 54 formed in the insertion tube 12 are bonded 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 third embodiment, the outer peripheral surface of the lower end of the new branch pipe 52 and the inner peripheral surface of the peripheral edge 54a of the through hole 54 formed in the insertion pipe 12 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 28 is not omitted.

Further, in the first to third 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.

In the first to third embodiments, the present invention is applied to an 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 14
The connection between the existing main pipe 11 and the existing branch pipe 16 may be not only rubber ring bonding but also adhesive bonding or other pressure-resistant bonding.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an existing pipe to which the branch structure of the first embodiment shown in FIG. 4 of the present invention is applied.

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

3 is a longitudinal sectional view showing a state in which a gap between an existing branch joint and an insertion pipe and a predetermined gap are filled with epoxy resin in a procedure for manufacturing the branch structure of the first embodiment.

FIG. 4 is a longitudinal sectional view showing a state in which a through hole is formed in a partition block in a procedure for manufacturing the branch structure according to the first embodiment of the present invention, and the branch structure is completed.

FIG. 5 is a longitudinal sectional view showing a state in which an insertion pipe is inserted into an existing sewage main pipe and a through hole is formed in the insertion pipe in a procedure for manufacturing the branch structure of the second embodiment of FIG. 8 of the present invention. is there.

FIG. 8 is a longitudinal sectional view showing a state in which a new branch pipe is pressed to a position of a through hole formed in an insertion pipe in a procedure for manufacturing the branch structure of the second embodiment.

FIG. 7 is a longitudinal sectional view showing a state where the insertion tube and the new branch tube shown in FIG. 6 are viewed from the axial direction of the insertion tube.

FIG. 8 is a longitudinal section showing a state in which a gap between an existing branch joint and an insertion pipe and a predetermined gap are filled with epoxy resin in a procedure for manufacturing a branch structure according to a second embodiment of the present invention, and the branch structure is completed. FIG.

9 is a longitudinal sectional view showing a state in which an insertion pipe is inserted into an existing sewage main pipe and a through hole is formed in the insertion pipe in a procedure for manufacturing the branch structure of the third embodiment of FIG. 11 of the present invention. is there.

FIG. 11 is a longitudinal sectional view showing a state in which a lower end of a new branch pipe is inserted into a through hole formed in an insertion pipe in a procedure for manufacturing the branch structure of the third embodiment.

FIG. 11 shows a procedure for manufacturing a branch structure according to a third embodiment of the present invention, in which a new branch pipe is pulled up, and a gap between an existing branch joint and an insertion pipe and a predetermined gap are filled with epoxy resin to complete a branch structure. It is a longitudinal cross-sectional view showing a state where it fell.

FIG. 12 shows an example in which a rubber ring for preventing epoxy resin from flowing out of a gap between an existing sewage main pipe and an insertion pipe in the branching method and the branching structure of the first to third embodiments of the present invention. FIG.

FIG. 13 is a perspective view of the insertion method according to the first to third embodiments of the present invention, in which a projection for preventing epoxy resin from flowing out of a gap between an existing sewage main pipe and an insertion pipe is provided on an insertion pipe; It is a longitudinal cross-sectional view which shows the example.

FIG. 14 is a longitudinal sectional view showing an example in which an annular soft rubber is provided over the entire periphery of the lower end surface of the new branch pipe in the branching method and the branching structure of the second embodiment of the present invention.

FIG. 15 is a longitudinal sectional view showing an example in which a small-diameter portion is formed at the lower end of a new branch pipe and a rubber ring is provided on the outer periphery of the small-diameter portion in the branching method and the branch structure of the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Existing pipe 11 ... Existing sewage main pipe 12 ... Insertion pipe 14 ... Existing branch joint 16 ... Existing branch pipe 18 ... Main body of existing branch joint 18a ... Cylinder part of existing branch joint 26, 46, 54 ... Through hole 28 ... partition member 30, 32, 48 ... gap 34 ... partition member inner hole 36 ... partition member through hole 42 ... partition block 44, 52 ... new branch pipe 56 ... flange-shaped part 60 ... rubber ring 68 ... soft member 72 ... Small diameter part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuhiro Hirao 64 Ishizu-Kitamachi, Sakai City, Osaka, Japan Inside Kubo Tavinyl Pipe Factory (72) Inventor Takachi Harada 64, Ishizu-Kitamachi, Sakai City, Osaka Inside Kubota Vinyl Pipe Factory (72) Inventor Tomoaki Hori 64 Ishizu-Kitacho, Sakai-shi, Osaka F-term in Kubo Tabaline Pipe Factory (reference) 2D063 BA01 BA28 BA35 3H019 BA04 BB01 BB08

Claims (8)

[Claims] 1. A branching method in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the insertion pipe is branched from the insertion pipe at a part of the branch pipe. (A) A resin is injected from the branch pipe. Filling the gap between the existing pipe and the insertion pipe and the inside of the branch pipe with a resin, (b) curing the resin, and (c) filling and curing the inside of the branch pipe and the gap. A method for branching from an insertion tube, comprising a step of piercing the insertion tube with a resin. 2. A branching method comprising inserting an insertion pipe into an existing pipe having a branch pipe and branching from the insertion pipe at a part of the branch pipe, wherein (a) the branch pipe is connected to the insertion pipe. Perforating, (b) aligning a hole in the branch pipe and inserting a new branch pipe, (c) injecting resin from a gap between the branch pipe and the new branch pipe, A method of branching from an insertion tube, comprising: filling a gap between the insertion tube and a gap between the branch tube and the new branch tube with a resin; and (d) curing the resin. 3. The step (a) of claim 1 or the step (c) of claim 2 further includes a step of preventing the injected resin from flowing out of a gap between the existing pipe and the insertion pipe. The method for branching from an insertion tube according to claim 1 or 2. 4. The step (b) includes inserting an outer surface of the new branch pipe into an inner surface of the hole of the branch pipe.
A method for branching from an insertion tube according to claim 2. 5. A branch structure in which an insertion tube is inserted into an existing pipe having a branch pipe, and a branch structure branches from the insertion pipe at a part of the branch pipe, wherein resin is injected from the branch pipe. And a partition member formed of a resin filled and cured inside the branch pipe and a gap between the insertion pipe and the insertion pipe, and a partition member formed through the branch pipe and penetrating from the portion formed in the branch pipe to the insertion pipe. A branching structure from the insertion tube, which has a hole to be inserted. 6. A branch structure in which an insertion pipe is inserted into an existing pipe having a branch pipe, and a branch structure branches from the insertion pipe at a part of the branch pipe, wherein the insertion pipe is formed from the branch pipe. A hole, a new branch pipe inserted into the branch pipe in alignment with the hole, and a resin injected from a gap between the branch pipe and the new branch pipe to form a gap between the existing pipe and the insertion pipe. And a partition structure from the insertion tube, comprising a partition member formed of a cured resin filled in a gap between the branch tube and the new branch tube. 7. The branching structure from the insertion tube according to claim 5, further comprising a flow stopping member for preventing the injected resin from flowing out from a gap between the existing tube and the insertion tube. 8. A branching method in which an insertion pipe is inserted into an existing pipe having a branch pipe, and the insertion pipe is branched from the insertion pipe at a portion of the branch pipe. Perforating, (b) inserting the pipe end of a new branch pipe having a flange portion at the pipe end through a hole and inserting it inside, and (c) pulling up the new branch pipe to remove the periphery of the hole. A method for branching from an insertion tube, comprising a step of projecting outward.