JP4429487B2 - Lining method for pipe inner surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for lining a pipe inner surface.
[0002]
[Prior art]
In recent years, for the purpose of regenerating and protecting existing pipes such as aging water and sewage pipes and gas pipes, a synthetic resin pipe whose volume has been reduced as necessary is inserted into the inner face of the existing pipe. Is expanded by heating and pressurizing and lining the existing pipe.
[0003]
This lining method has a problem that the synthetic resin pipe lined to the existing pipe is thermally shrunk as it is cooled, generating a gap between the existing pipe and the synthetic resin pipe, leading to fluid leakage. .
[0004]
In order to solve this problem, a method for avoiding fluid leakage by sealing the lining terminal and stopping water has been proposed.
[0005]
For example, in Japanese Patent Application Laid-Open No. 8-34060, a cylindrical rubber ring is fitted and fixed to both ends of an existing pipe (the “main pipe” in the present invention), and a hard plastic tube (this The method of inserting the “synthetic resin tube”) in the invention is described.
In Japanese Utility Model Publication No. 7-9624, a tube (a “main pipe” in the present invention) has a lining (“synthetic resin pipe” in the present invention) terminal portion slightly in front of the end, and two hollows having rubber-like elasticity in the pipe. A seal ring (corresponding to the above “rubber ring”) is installed in a loosely inserted state, and a tubular metal part having a flange-like edge opening toward the inner surface of the pipe, the bare pipe part at the end of the pipe with one seal ring, A fixing structure of a pipe end is described in which a lining portion is pressure-bonded with the other seal ring and a seal material is filled between the seal rings.
[0006]
[Problems to be solved by the invention]
However, the pressure of the rubber ring, etc., is sufficient when the existing pipe is pressed directly, but it is difficult to secure enough when using a hard plastic tube, and therefore the water stoppage is insufficient. It tends to be.
[0007]
Moreover, the complicated mechanism as described above is not preferable because it causes a decrease in workability in field construction.
[0008]
Further, when the existing pipe is used in a bad environment such as a sewage pipe, the rubber ring or the like is directly exposed to the sewage and is likely to deteriorate. The existing pipe is corroded in direct sewage and has a problem in durability, and it is not preferable to perform anticorrosion treatment to avoid this problem because of high cost.
[0009]
An object of the present invention is to solve the above-mentioned problems and to provide a method for lining a pipe inner surface that can easily and surely stop a lining terminal when lining a synthetic resin pipe on the inner surface of a main pipe.
[0010]
[Means for Solving the Problems]
In the method of lining the inner surface of the pipe according to the present invention, the synthetic resin pipe is inserted into the inner face of the main pipe, and then the synthetic resin pipe is heated and pressurized to expand and the linear body is spirally formed in advance before lining the main pipe. It is attached to the pipe end inner peripheral surface of the main pipe or the pipe end outer peripheral surface of the synthetic resin pipe in a state wound around the main pipe, and the synthetic resin pipe is inserted into the main pipe, so that the main pipe inner peripheral surface and the resin are inserted. After the spiral linear body was sandwiched between the outer peripheral surface of the pipe making, the synthetic resin pipe was expanded, and then formed with the linear body, the main pipe, and the synthetic resin pipe A sealing material is injected into the gap from a pipe port provided at the pipe end of the main pipe.
[0011]
The main pipe used in the present invention is not particularly limited as long as it is a pipe used for lining by heating, pressurizing and expanding a synthetic resin pipe, and may be an existing pipe or a new pipe. May be.
In any case, it is necessary to heat and pressurize and swell the synthetic resin pipe to expand the lining, and then the synthetic resin pipe contracts to stop the end of the pipe.
[0012]
The synthetic resin pipe used in the present invention is not particularly limited as long as it is inserted into the inner surface of the main pipe, heated and pressurized to expand and is lined with the main pipe. For example, the synthetic resin pipe is slightly thinner than the main pipe. A resin tube may be used, or the synthetic resin tube may be folded and inserted into the inner surface of the main tube.
Examples of the material of the synthetic resin tube include hard vinyl chloride resin; polyethylene resins such as medium density polyethylene, high density polyethylene, and silane-modified polyethylene resin; polyvinyl acetate; polyvinyl acetal; polyvinyl alcohol; The thermoplastic resin which can be used as a pipe material for use is mentioned.
[0013]
The linear body used in the present invention may be made of a metal material, or may be made of a synthetic resin or an inorganic material. Even if it consists of a metal material, since a linear body is embed | buried under the sealing material mentioned later, there is no worry of corrosion.
[0014]
The sealing material used in the present invention is formed after the synthetic resin tube is expanded, and enters the spirally wound linear body, the main tube, and the gap surrounded by the synthetic resin tube, and is cured. If it does, it will not specifically limit, For example, a reaction hardening type epoxy resin etc. are used.
[0015]
As described above, the pipe inner surface lining method of the present invention has a pipe end inner peripheral surface of the main pipe in a state in which a linear body is spirally wound in advance after inserting a synthetic resin pipe into the inner surface of the main pipe. Or attached to the outer peripheral surface of the tube end of the synthetic resin pipe.
Next, by inserting a synthetic resin pipe into the main pipe, the spiral linear body is sandwiched between the main pipe inner peripheral surface and the synthetic resin pipe outer peripheral surface.
Then, the synthetic resin pipe is heated and pressurized to expand it, and then a sealing material is injected into the gap between the spiral linear bodies from the pipe opening provided at the pipe end of the main pipe. And by hardening the sealing material, the lining terminal on the inner surface of the main pipe can be easily and reliably stopped.
[0016]
In addition, when applying the lining method for a pipe inner surface of the present invention to a rehabilitation pipe, the pipe end is usually arranged so as to be in a human hole so that the rehabilitation pipe can be easily inserted into the main pipe. It is also easy to attach the body.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings.
[0018]
FIG. 1 is a cross-sectional view showing a state in which a linear body is attached to a pipe end outer peripheral surface of a synthetic resin pipe in the present invention, (a) is a longitudinal cross-sectional view thereof, and (b) is an A of (a). It is -A sectional drawing.
In FIG. 1, 1 is a main pipe, 2 is a synthetic resin pipe, and 3 is a linear body.
[0019]
As shown in FIG. 1, in the present invention, a linear body 3 made of a steel material is wound spirally around one end of a vinyl chloride resin tube 2 (partially not shown).
As described above, the linear body 3 may be attached to the pipe end inner peripheral surface of the main pipe.
Next, the vinyl chloride resin pipe 2 is moved in the direction of the arrow in FIG. 1A and inserted into the main pipe 1.
[0020]
FIG. 2 is a cross-sectional view showing a state in which a spiral linear body is sandwiched between the inner peripheral surface of the main pipe and the outer peripheral surface of the synthetic resin pipe in the present invention.
As shown in FIG. 2, in the present invention, the vinyl chloride resin pipe 2 is placed in the main pipe 1 until the side end portion of the vinyl chloride resin pipe 2 coincides with the tube port 11 of the side end portion of the main pipe 1. insert.
[0021]
When the insertion of the vinyl chloride resin tube 2 is completed, the resin tube 2 is expanded by heating and pressurizing, and is brought into close contact with the main tube 1. At this time, expansion of the end portion of the vinyl chloride resin tube 2 is restricted by the linear body 3, and a gap (not shown) surrounded by the linear body 3, the main tube 1, and the vinyl chloride resin tube 2 is formed. It is formed.
[0022]
Next, a reaction-curing type epoxy resin is injected into the gap as the sealing material 4 from the tube port 11 (see FIG. 3). After the injection, the end of the tube is heated and the sealing material 4 is hardened, whereby the gap is sealed, the tube end is sealed, and water is stopped.
[0023]
【The invention's effect】
The pipe inner surface lining method of the present invention is preliminarily attached to the pipe end inner peripheral surface of the main pipe or the pipe end outer peripheral surface of the synthetic resin pipe in a state in which the linear body is spirally wound. After inserting the synthetic resin pipe into the state where the spiral linear body is sandwiched between the inner peripheral surface of the main pipe and the outer peripheral surface of the synthetic resin pipe, the synthetic resin pipe is expanded. After that, since the sealing material is injected into the gap formed by the linear body, the main pipe, and the synthetic resin pipe from the pipe port provided at the pipe end of the main pipe, the seal can be obtained even if there is no pressure contact force. In addition, the sealing material penetrates to the inside along the spiral linear body, so that water can be reliably stopped.
[0024]
In addition, since the spiral linear body need only be attached to the pipe end inner peripheral surface of the main pipe or the pipe end outer peripheral surface of the synthetic resin pipe, the construction is easy.
Furthermore, the shrinkage of the synthetic resin pipe can be restricted by the sealing material.
[0025]
Therefore, according to the lining method of the present invention, when the synthetic resin pipe is lined on the inner surface of the main pipe, the lining terminal can be easily and reliably stopped.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a linear body is mounted on a pipe end outer peripheral surface of a synthetic resin pipe in the present invention, (a) is a longitudinal cross-sectional view thereof, and (b) is A of (a). It is -A sectional drawing.
FIG. 2 is a cross-sectional view showing a state in which a helical linear body is sandwiched between an inner peripheral surface of a main pipe and an outer peripheral surface of a synthetic resin pipe in the present invention.
FIG. 3 is a cross-sectional view showing a state in which a sealing material is injected into a gap formed by a linear body, a main pipe, and a synthetic resin pipe from a pipe port provided at a pipe end of the main pipe in the present invention. .
[Explanation of symbols]
1 Main pipe 11 Pipe port 2 Synthetic resin pipe (vinyl chloride resin pipe)
3 Linear body 4 Sealing material

Claims (1)

After inserting the synthetic resin pipe into the inner surface of the main pipe, the synthetic resin pipe is heated, pressurized, expanded, and lined with the main pipe in advance in a state where the linear body is spirally wound. It is attached to the inner peripheral surface of the end or the outer peripheral surface of the pipe end of the synthetic resin pipe, and the synthetic resin pipe is inserted into the main pipe, so that a spiral is formed between the inner peripheral surface of the main pipe and the outer peripheral surface of the synthetic resin pipe. After the linear wire body is sandwiched, the synthetic resin pipe is expanded, and then provided at the end of the main pipe in the gap formed by the linear body, the main pipe, and the synthetic resin pipe. A lining method for an inner surface of a pipe, characterized by injecting a sealing material from the pipe opening.

Images