JPH01257028A - Pipe line forming method and tubular body possessing a plurality of pipe lines - Google Patents

Abstract

PURPOSE:To enable the title method to provide the application of a timeworn pipe for an optical communication's net without changing the same with a newly-established pipe by a method wherein a flexible tube comprised by providing with a plurality of passages stretching extending over the whole length is inserted into an existing pipe, a pipe line is formed by expanding the passages each by sending a fluid into the passages of the tube and the tube is made to run along the inside of the existing pipe. CONSTITUTION:A cylindrical tube 20 is arranged along the inside of an existing pipe 10 and an interior space of the tube 20 is divided into above-mentioned three pipe lines 1, 2, 3 with partition walls 21, 22. The pipe lines 1, 2, 3 are formed in the following method: the tube 20 comprised of uncured curable synthetic resin provided with flexibility and possessing a passage 1a forming an egg-shaped through port when it is expanded and two passages 2a, 3a forming crescent-shaped through ports is inserted into the existing pipe 10 under a state where the same is contracted and flattened. The passages 1a, 2a, 3a are expanded by sending a fluid into those, the tube 20 is run along the inside of the existing pipe 10 and then tube 20 and the partition walls 21, 22 are cured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of forming a new pipeline inside a pipe such as a sewer pipe (existing pipe) buried underground; and a pipe body having a plurality of pipe lines using existing pipes.

[Conventional technology]

In recent years, attempts have been made to form optical communication networks using sewer pipes installed in cities.One example is the installation of optical communication cables on the inner surface of the ceiling of sewer pipes that do not come into contact with sewage. There is something to set up.

On the other hand, attempts have also been made to extend the service life of old sewer pipes by forming a lining layer on their inner surfaces.

[Problem to be solved by the invention]

However, it is natural that it is not desirable to immediately use old sewage pipes for optical communication networks, and such old sewage pipes should be replaced with new ones.
There was a problem in that it was necessary to use the newly installed sewage pipes for the optical communication network, which required very large-scale construction work.

The present invention was made in view of this problem, and it does not require replacing existing pipes such as sewage pipes with sufficient service life, but also old existing pipes with new pipes (for applications such as optical communication networks). It is an object of the present invention to provide a method for forming a conduit and a pipe body having a plurality of conduits.

[Means to solve the problem]

In the pipe forming method of the first invention, a flexible tube having a plurality of passages extending over the entire length is inserted into an existing pipe, and then a fluid is sent into each passage of the tube to form a flexible tube having a plurality of passages. A conduit is formed by inflating the pipe, and the tube is placed along the inner surface of the existing pipe.

A tube body having a plurality of conduits according to the second aspect of the invention is one in which an internal space of the tube along the inner surface of an existing pipe is partitioned into a plurality of conduits by a partition wall.

The tube body having a plurality of conduits according to the third invention is the tube body according to the second invention in which some of the conduits are closed with a filler material.

A method for forming a pipe line according to a fourth aspect of the present invention includes inserting a flexible tube having a plurality of passages extending over the entire length into an existing pipe, and then inflating each passage by feeding fluid into each passage of the tube. This method involves forming a conduit using the pipe, closing a part of the conduit with a filler, and making the tube run along the inner surface of the existing pipe.

[For production]

According to the first and second inventions, the inner surface of the existing pipe is lined with the tube, and moreover, the plurality of passages provided in the tube can be used as the newly installed pipe.

According to the third and fourth aspects of the invention, the filling material blocking a part of the pipe line backs up the partition wall of the passage adjacent to the pipe line, making it difficult to tear.

〔Effect of the invention〕

According to the first and second inventions, the plurality of pipes can be used for the original purpose of the existing pipes, such as discharging sewage, and the remaining pipes can be used for other purposes, such as laying optical communication cables or discharging warm water. At the same time, even if the inner surface of an existing pipe is old and has a rough surface, the inner surface of the existing pipe is smoothed by the tube that serves as a lining layer, extending its service life. This has the advantage that the range of applications can be expanded without having to replace existing pipes with new pipes.

According to the third and fourth inventions, there is an advantage that the extra pipe line of the existing pipe can be used to reinforce the partition wall of the pipe line used for the original purpose of the existing pipe or for another purpose.

[Example] FIG. 1 is a longitudinal sectional front view of a tube body having three pipe lines 1, 2.3, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. In this pipe body, a cylindrical tube 20 is arranged along the inner surface of an existing pipe 10 made of a hume pipe or a steel pipe, and the internal space of this tube 20 is divided into three pipes 1° by partition walls 21 and 22. It is divided into 2.3. three pipes 1
, 2.3, the central conduit 1 has an egg-shaped opening, and the remaining two conduits 2 and 3 are formed symmetrically on both sides of the central conduit 1. The mouth is crescent-shaped.

The pipes 1, 2.3 are formed by the following method.

That is, as shown in FIG. 3, there is a passage 1a which forms an oval-shaped opening as shown in FIG. A flexible tube 20 made of an uncured hardening synthetic resin having passages 2a and 3a is inserted into the existing pipe 10 in a contracted and flattened state, and then the respective passages 1a are inserted.

2a and 3a are inflated by feeding fluid such as air or water, the tube 20 is placed along the inner surface of the existing pipe 10, and then the tube 20 and the partition walls 21 and 22 are hardened.

When inflating three passages 1a, 2a, 3a, even if all of those passages 1a, 2a, 3a are inflated at the same time,
After inflating the central passage 1a, passages 2a on both sides thereof,
3a may be inflated, or the central passage 1a may be inflated after the passages 2a, 3a on both sides are inflated, and the passage shape is determined by appropriately adjusting the fluid pressure in each passage 1a, 2a, 3a before hardening.

As described above, a plurality of pipelines 1.
2.3, the tube 20 is in close contact with the entire inner surface of the existing pipe 1o, but it is in a non-adhered state, and the pipe line 1.2.3 receives water pressure due to water leakage from the existing pipe 10, and the pipe It is necessary to keep the pipe wall thick. tube 20
To bond the tube 20 to the existing pipe 10, a layer of adhesive is formed on the outer surface of the uncured tube 20 before insertion into the existing pipe 10, and the adhesive is bonded by inflating the tube 20 inside the existing pipe 10. By joining the tube 20 to the inner surface of the existing pipe 10 via the layer of agent, the tube 20 can be firmly fixed to the existing pipe 10.

The plurality of conduits 1.2°3 formed as described above can be used not only for the original purpose of the existing pipe 10 but also for various other purposes. For example, if the original purpose of the existing pipe 10 was to drain sewage, the central pipe 1 would be used for sewage, and the pipes 2 and 3 on both sides would be used for laying optical communication cables. It can be used for flushing warm water or reprint water. In this case, since the central pipe 1 has an egg-shaped opening, it has the characteristic that the volume of water is high compared to the flow rate, similar to known stamped pipes, so even when the water volume is low, solid foreign matter This has the advantage that the water will not accumulate in the pipe 1.Also, if an appropriate use cannot be found for the pipes 2 and 3 on both sides, foaming them as shown in Figure 6. All you have to do is seal it with filler 4.4 such as body, cement milk, air mortar, water, etc., then the partition walls 21 and 22
is backed up by the filler 4.4 and becomes difficult to tear. If water is used, it becomes possible by draining the pipes 2 and 3 when it is desired to use them.

Tube 20 and partition wall 2 used in this invention
For example, 1.22 is made of glass fiber reinforced polyester resin (FRP) mixed with a UV curing accelerator or a thermosetting accelerator at a predetermined mixing ratio, and when the FRP contains an ultraviolet curing accelerator. is cured by ultraviolet irradiation, and if it contains a thermosetting accelerator, it is cured by heating. Note that although natural curing is possible, it takes time for curing, which is not very preferable. Further, the inner and outer surfaces of the FRP may be covered with a protective film made of, for example, polyvinyl alcohol resin to protect the FRP when it is inserted into the existing pipe 10. When a protective film made of polyvinyl alcohol resin is used, the protective film is dissolved by the moisture accumulated in the existing pipe 10 after the tube 20 is inserted into the existing pipe 10, so there is no need to pull out the protective film. There is.

Any method may be used to insert the tube 20 into the existing pipe 10. Specifically, for example, tube 20
There are two methods: pulling the tube 2o inside out into the existing pipe 1o, and feeding the tube 2o inside out into the existing pipe 1o while inverting it with the pressure of a fluid such as air or water.

In FIG. 4, the internal space of the tube 20 along the inner surface of the existing pipe 10 is divided by a partition wall 23 into a large-diameter pipe 5 and a small-diameter pipe 6 located above the pipe 5. A pipe body is illustrated, and in FIG.
This example shows a pipe body divided into an egg-shaped pipe 1, crescent-shaped pipes 2.3 located on both sides of the egg-shaped pipe 1, and a small-diameter pipe 7 located above the egg-shaped pipe 1. Even in these pipe bodies, the small diameter pipes 6 and 7 and the crescent-shaped pipes 2 and 3 can be used for purposes such as laying optical communication cables. Further, if the small-diameter pipes 6, 7 and the crescent-shaped pipes 2, 3 are unnecessary, they can be plugged with the filler. In addition,
The method of forming the conduits 2, 3, 6.degree. 7 is similar to that described in FIGS. 1-3.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a tube body having a plurality of conduits according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is an existing uncured tube. 4 is a longitudinal sectional front view illustrating a state in which the tube body is inserted into a pipe, FIG. 4 is a longitudinal sectional front view of a tube body having a plurality of ducts according to another embodiment, and FIG. Vertical front view of tube body, No. 6
The figure is a longitudinal sectional front view of a pipe body in which a part of the pipe line is closed with a filler material. la, 2a, 3a... passage, 1.2, 3, 5, 6°7
...Pipeline, 4...Filling material, 20...Tube, 2
1゜22.23, 25.26...Partition wall. Patent Applicant: Takiron Co., Ltd. No. 1 Figure 2o Thousand Knees 7゛21.22, 23, 24.25, 26: Ijijig'P
噌i-2 ″ ＼ ゛ ゝ＼ ゝ;10!J
Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. After inserting a flexible tube comprising a plurality of passages extending over the entire length into an existing pipe, fluid is sent into each passage of the tube to inflate each passage. A method for forming a conduit by forming a conduit and placing the tube along the inner surface of the existing pipe. 2. A tube body having a plurality of ducts in which the internal space of the tube along the inner surface of the existing pipe is divided into a plurality of ducts by a partition wall. 3. A pipe according to item 2, which has a plurality of pipes, some of which are blocked by a filler. 4. Inserting a flexible tube having a plurality of passages extending over the entire length into the existing pipe, and then inflating each passage by injecting fluid into each passage of the tube to form a conduit; A method for forming a conduit including closing a part of the conduit with a filler and placing the tube along the inner surface of the existing pipe.