JPH11108288A - Lining method and lining pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining method, lining pipes and a compound pipe with a constitutional principal part in common to these lining pipe, wherein even when large damage and deformation are generated in the pipe itself, a function of a lining layer is maintained. SOLUTION: In this lining method, in an inner side of a pipe 1, a cylindrical lining layer 3 preventing a leak of fluid is formed. Here, a separation layer 2 generating separation of the lining layer 3 easier than in the case of directly forming the lining layer 3 in an inner surface of the pipe 1 is formed in the inner surface of the pipe 1, thereafter in a surface of the separation layer 2, the lining layer 3 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining method and a lining pipe for forming a cylindrical lining layer for preventing fluid leakage inside a pipe, and a composite pipe having the same main components as those of the lining method.

[0002]

2. Description of the Related Art Conventionally, this type of lining method is performed to repair or prevent various deteriorations in metal pipes and the like. After applying a room temperature curing type epoxy resin or the like to the inner surface of the pipe by various methods, Methods of curing have been performed. The lining pipe thus lining is formed by forming a tubular lining layer made of a cured resin in a state of being adhered to an inner surface of a metal pipe or the like, and the lining layer is not easily peeled off. Met.

[0003]

However, in the above-mentioned lining pipe, although there is no particular problem in a normal use environment, when a large displacement is applied to the pipe due to an earthquake or the like and the pipe is damaged, the inner lining layer is not provided. Cannot follow the displacement caused by the damaged portion, and the damage occurs at the same time. Further, even when the pipe is deformed, tensile stress or compressive stress concentrates on the lining layer in the deformed portion, and the lining layer may be damaged. As a result, the carrier gas and liquid inside leak.

To solve such a problem, a method of providing a rubber-like lining layer having a larger breaking elongation than an epoxy resin or the like can be considered. However, as described above, the lining layer adheres to the inner surface of the pipe. With such a structure, it is unlikely to be effective if a large crack occurs in the tube. That is, when a large crack occurs in the pipe due to an earthquake or the like, a so-called “zero span” state occurs, and the elongation of the lining layer adhered to the inner surface of the pipe becomes extremely large (for example, 500% or more). Since there is usually no material that does not break in the method described above, there is a limit in a method for improving the material of the lining layer.

Accordingly, an object of the present invention, in view of the above,
It is an object of the present invention to provide a lining method and a lining tube capable of maintaining the function of a lining layer even if a large breakage or deformation occurs in the tube itself, and a composite tube having a main part common to the lining method and the lining tube.

[0006]

A feature of the lining method of the present invention for achieving this object is to provide a lining method for forming a tubular lining layer for preventing fluid leakage inside a pipe. Forming a release layer that facilitates the separation of the lining layer on the inner surface of the tube, and then forming the lining layer on the surface of the release layer, compared to the case where the lining layer is formed directly on the inner surface of the pipe. .

In the above structure, the lining layer is
Although it can be formed of various materials and methods as described later, it is more preferable that the lining layer is formed by applying a liquid lining agent which becomes a rubber after curing, from the following effects.

Further, the release layer can be formed by various materials and methods as described later, but it is more preferable that the release layer is formed mainly of a fluororesin from the following effects. .

On the other hand, the characteristic structure of the composite pipe of the present invention is that, in a composite pipe having a tubular layer having a larger breaking elongation than the pipe inside the pipe, an inner surface of the pipe and the tubular layer are formed. The present invention is characterized in that a peeling layer is interposed therebetween so that the inner surface of the tube and the tubular layer are easily peeled.

On the other hand, the characteristic structure of the lining tube of the present invention is that in a lining tube having a tubular lining layer formed inside the tube to prevent fluid leakage, the lining layer is formed directly on the inner surface of the tube. This is characterized in that a release layer for facilitating the release of the lining layer is formed on the inner surface of the tube, and the lining layer is formed on the surface of the release layer.

[0011] In the above structure, the lining layer comprises:
Although various properties can be used as described below, a rubber-like lining layer is more preferable than the effects described below.

As the release layer, various materials can be used as described later, but it is more preferable that the release layer contains a fluororesin as a main component from the viewpoint of the operation and effects described later.

According to the above-mentioned feature of the lining method of the present invention, after forming a peeling layer which facilitates peeling, the lining layer is formed on the surface thereof. When a large displacement is applied and breakage occurs, peeling of the lining layer occurs near the damaged portion and the tensile stress is dispersed, so that the substantial elongation of the lining layer is zero span compared to the apparent elongation. It becomes very small as compared with the case (for example, 1/10 or less of the apparent elongation). For this reason, even if the pipe is damaged, the lining layer is hardly damaged, and leakage of the internal carrier gas or liquid can be prevented. In addition, even when the tube is deformed, the lining layer is less likely to be damaged because the separation occurs near the deformed portion and the concentration of stress can be avoided. As a result, it was possible to provide a lining method capable of maintaining the function of the lining layer even if the pipe itself is significantly damaged or deformed.

In the case where the lining layer is formed by applying a liquid lining agent which becomes rubbery after curing,
Since the rubber-like lining layer has a larger breaking elongation than the resin-type lining layer, it is possible to more reliably prevent the lining layer from being damaged and maintain its function. Further, since the liquid lining agent which becomes rubber-like after curing is in a liquid state before curing, it can be easily applied to the inside of the tube, and a rubber-like lining layer can be formed only by curing after application.

Further, when the release layer is formed mainly of a fluororesin, the adhesion of the surface of the fluororesin is particularly small, as shown in the results of the examples described later, and the like. The releasability of the lining layer by the release layer becomes excellent.

[0016] On the other hand, according to the above-mentioned characteristic structure of the composite pipe of the present invention, a peeling layer is interposed between the inner surface of the pipe and the tubular layer to prevent peeling between the inner surface of the pipe and the tubular layer. As in the case described above, even if the pipe is broken due to an earthquake or the like, the tubular layer is peeled off in the vicinity and the tensile stress and the like are dispersed. The degree of elongation becomes extremely small, and the tubular layer having a higher elongation at break is less likely to be damaged. As a result, it was possible to provide a composite pipe capable of maintaining the function of the tubular layer even if the pipe itself was significantly damaged or deformed.

On the other hand, according to the characteristic structure of the lining tube of the present invention, a peeling layer which makes the lining layer more easily peeled than the case where the lining layer is formed directly on the inner surface of the tube is provided on the inner surface of the tube. In addition, since the lining layer is formed on the surface of the release layer, as in the case of the lining method described above, when a large displacement is applied to the pipe due to an earthquake or the like and the pipe is broken, Since the peeling of the lining layer occurs in the vicinity and the tensile stress is dispersed, the substantial elongation of the lining layer becomes very small as compared with the apparent elongation. For this reason, even if the pipe is damaged, the lining layer is hardly damaged, and leakage of the internal carrier gas or liquid can be prevented. In addition, even when the tube is deformed, the lining layer is less likely to be damaged because the separation occurs near the deformed portion and the concentration of stress can be avoided. As a result, it was possible to provide a lining pipe capable of maintaining the function of the lining layer even if the pipe itself is significantly damaged or deformed.

When the lining layer is a rubber-like lining layer, the rubber-like lining layer has a larger breaking elongation than that of the resin type, so that the lining layer can be more reliably prevented from being damaged. Function can be maintained.

Further, when the release layer is mainly composed of a fluororesin, as shown in the results of Examples described later, the lining is preferably used because the adhesiveness of the surface of the fluororesin is particularly small. The exfoliation property of the exfoliation layer in the tube is excellent.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
It will be described based on.

[Lining Method] In the lining method of the present invention, in the lining method of forming a tubular lining layer 3 for preventing fluid leakage inside the pipe 1, the lining layer 3 is formed directly on the inner surface of the pipe 1. In some cases, the lining layer 3 is formed on the surface of the release layer 2 after forming the release layer 2 that facilitates the separation of the lining layer 3 on the inner surface of the tube 1.

Pipe 1 to be subjected to the lining method of the present invention
Examples include various metal pipes, resin pipes, and pottery pipes. The present invention is particularly effective for metal pipes used for underground pipes and whose damage due to an earthquake or the like is problematic.

In the present invention, first, the release layer 2 is formed on the inner surface of the tube 1. The release layer 2 makes the lining layer 3 more easily peeled than when the lining layer 3 is formed directly. The release layer 2 may be formed of any material as long as it has the above-mentioned functions. The release layer 2 may be formed of any material. One that causes peeling at the interface between 2 and the lining layer 3, one that causes peeling at both,
For example, one that causes peeling by separation of the peeling layer 2 itself,
Either form may be used. Specifically, polytetrafluoroethylene, polychlorotrifluoroethylene, copolymers of these and other components, fluororesins such as polyvinylidene fluoride, silicone resins, organosilicon polymers such as silicone oil, paraffin wax, Examples thereof include waxes such as carnauba wax, lecithin, and the like. Among them, those containing a fluororesin as a main component are preferable for the reasons described in the section of the above-mentioned effects.

The release layer 2 may be formed on the inner surface of the pipe by spray coating using various solutions or powders of the above-mentioned materials, coating using a lining pig, etc. A layer may be formed. The thickness of the release layer 2 is not particularly limited as long as it has a release function, and the release layer 2 may be formed to such an extent that the lining layer 3 is released, and is not necessarily formed on the entire surface of the pipe 1. No need to be done.

In the present invention, the lining layer 3 is subsequently formed on the surface of the release layer 2, and any conventional method and material can be used for forming the lining layer 3. For example, a lining agent containing a reaction curable resin such as an epoxy resin, a urethane resin, and a modified silicone resin and a curing agent is applied to the surface of the release layer 2 in the tube using a lining pig or the like and cured. The lining layer 3 can be suitably formed.

Above all, it is preferable to form by applying a liquid lining agent which becomes rubbery after curing for the above-mentioned reason. As such lining agent, silicone-based, modified, Examples include silicone-based, polysulfide-based, and polyurethane-based ones, which are commercially available. Particularly, a material for forming an elastomer matrix-type polymer alloy of a silyl functional group-terminated polypropylene oxide (commercially available from Kanegabuchi Chemical Industry Co., Ltd.) and an epoxy resin (bisphenol A diglycidyl ether, etc.) is solvent-free and low It is preferably used in the present invention because it has room temperature curability and durability, and has high elongation at break.

The thickness of the lining layer 3 is set to 1.0 to 5.0 mm so that its function can be maintained even when the lining layer 3 is peeled off from the tube 1.
Is preferable, and a thickness of 2.0 to 4.0 mm is more preferable.

[Lining Pipe] The lining pipe of the present invention is, as shown in FIG. 1, a lining pipe in which a tubular lining layer 3 for preventing fluid leakage is formed inside the pipe 1. A peeling layer 2 that facilitates peeling of the lining layer 3 is formed on the inner surface of the tube 1 and a lining layer 3 is formed on the surface of the peeling layer 2 as compared with the case where the lining layer 3 is formed directly on the inner surface of the pipe. Is formed. Such a lining pipe of the present invention is suitably obtained by the lining method of the present invention as described above. The method of forming the pipe 1, the release layer 2, and the lining layer 3, the forming material, the thickness and the properties thereof are as follows. , Almost as described above. However, the lining tube of the present invention
It can also be manufactured by a method other than the lining method described above. For example, an internal release agent such as a silicon-based or metal soap that forms a release layer 2 by bleeding or the like on the pipe 1 side is added to the lining agent. Alternatively, it can be manufactured by a method in which the release layer 2 and the lining layer 3 are formed at once by a lining step.

[Composite pipe] The composite pipe of the present invention has the same peeling layer as the above-mentioned lining pipe. That is, a composite pipe in which a tubular layer having a larger breaking elongation than the pipe is formed inside the pipe, wherein a release layer is interposed between the inner surface of the pipe and the tubular layer, The inner lining is easily peeled off from the cylindrical layer, and the above-mentioned lining tube is one example.

That is, the tubular layer does not need to be formed by lining, but may be formed by a method of interpolating a tubular layer made of a resin tube or another metal tube. In addition, the composite tube may be one in which the tube, the release layer, and the tubular layer are formed at the same time during the manufacture thereof, for example, by extrusion. In that case, the composite pipe having the same function as the insertion type double pipe, because the release layer has the shape retaining function of the cylindrical layer at the time of manufacture and also has the function of releasing the cylindrical layer, It can be manufactured more easily.

[0031]

The present invention will now be described by way of examples showing more specific constitutions and effects thereof, but the present invention is not limited to these examples.

Example 1 A metal pipe having a length of 150 mm and an inner diameter of 30 mm (SUS
Are fixed by abutting on both end surfaces thereof, and then spray-coated on the inner surface of a 75 mm portion on both sides of the portion using a Teflon spray (Fine Chemical Co., Ltd., New TFE Coat). A layer was formed.
A two-component lining agent comprising the following components was uniformly applied to the surface and cured at room temperature for 24 hours to form a lining layer (thickness: 3.0 mm) to obtain a lining tube of the present invention.

[Lining agent composition] 100 parts by weight of silyl functional group-terminated polypropylene oxide (Silyl SAT200, manufactured by Kaneka Chemical Co., Ltd.) 50 parts by weight of epoxy resin (Epicoat # 828, manufactured by Yuka Shell Epoxy Co., Ltd.)・ Silyl hardener 2 parts by weight (No.918, manufactured by Sankyoki Gosei Co., Ltd.) ・ Epoxy hardener 5 parts by weight (DMP-30, manufactured by Kayaku Akzo Co., Ltd.) ・ Adhesive strength imparting agent 5 parts by weight (Aminosilane, A-1122, manufactured by Nippon Unicar Co., Ltd.)

Using the obtained lining pipe, both sides of the two pipes were set in a tester, and a pulling speed of 200 mm
/ Min tensile test. Table 1 shows the breaking load and breaking elongation at that time.

Example 2 A lining tube was prepared in the same manner as in Example 1 except that an epoxy resin lining agent having the following composition was used instead of the lining agent, and a tensile test was conducted. went. Table 1 shows the breaking load and breaking elongation at that time.

[Lining agent composition] 100 parts by weight of epoxy resin (Epicoat # 828, manufactured by Yuka Shell Epoxy Co., Ltd.) 10 parts by weight of epoxy curing agent (DMP-30, manufactured by Kayaku Akzo Co., Ltd.)

Comparative Example 1 A lining tube was prepared and subjected to a tensile test in the same manner as in Example 1 except that no release layer was formed. Table 1 shows the breaking load and breaking elongation at that time.

Comparative Example 2 A lining tube was prepared and subjected to a tensile test in the same manner as in Example 2 except that no release layer was formed. Table 1 shows the breaking load and breaking elongation at that time.

[0039]

[Table 1]

As shown in the results of Table 1, the apparent rupture elongation in the examples is much larger than that of the corresponding comparative example, and the function of the lining layer can be maintained even if the pipe itself is severely damaged. It turns out that it can be maintained.
In particular, in Example 1 using a rubber-like lining agent after curing, compared to Example 2 using a normal resin-based lining agent, the apparent elongation at break was larger and more reliably. It was found that the function of the lining layer can be maintained by preventing the lining layer from being damaged.

Examples 3 to 5 A lining tube was prepared in the same manner as in Example 1 except that a release layer was formed as described below instead of forming a release layer using Teflon spray. Then, a tensile test was performed. The elongation at break at that time is shown in Table 2 together with Example 1.

Example 3: Silicone resin layer (KF96SP, manufactured by Shin-Etsu Silicone) Example 4: Silicone oil (Shin-Etsu Silicone Oil KF965, manufactured by Mutual Science Chemical Glass Works) Example 5: Paraffin wax (Kishida Chemical, paraffin 010-59365)

[0043]

[Table 2]

As can be seen from the results in Table 2, Example 1 in which the fluororesin layer was formed as the release layer had the most excellent release property of the lining layer as compared with Examples in which other release layers were formed. I understood.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a lining tube.

[Explanation of symbols]

 1 tube 2 release layer 3 lining layer

Claims (7)

[Claims] 1. A lining method for forming a tubular lining layer inside a pipe to prevent leakage of fluid, wherein the lining layer is more easily peeled off than when the lining layer is formed directly on the inner surface of the pipe. A lining method comprising: forming a release layer which is likely to occur on the inner surface of the tube; and forming the lining layer on the surface of the release layer. 2. The lining method according to claim 1, wherein the lining layer is formed by applying a liquid lining agent which becomes rubbery after curing. 3. The lining method according to claim 1, wherein the release layer is formed mainly of a fluororesin. 4. A composite pipe in which a tubular layer having a larger breaking elongation than the pipe is formed inside the pipe, wherein a release layer is interposed between the inner surface of the pipe and the tubular layer. ,
A composite pipe in which separation between the inner surface of the pipe and the tubular layer is easily caused. 5. A lining pipe in which a tubular lining layer for preventing fluid leakage is formed inside a pipe, wherein the lining layer is formed more than when the lining layer is formed directly on the inner surface of the pipe. A lining tube in which a peeling layer that facilitates peeling is formed on the inner surface of the tube, and the lining layer is formed on the surface of the peeling layer. 6. The lining tube according to claim 5, wherein the lining layer is a rubber-like lining layer. 7. The lining tube according to claim 5, wherein the release layer is mainly composed of a fluororesin.