JP2005319418A - Coating film in inside of pipe and formation method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent pollution of water owing to elution of endocrine-disrupting chemicals from a synthetic resin in the inner face of a pipe. <P>SOLUTION: A synthetic resin coating material is applied to the inner face of the pipe 1 by injecting the synthetic resin coating material to the inside of the pipe 1 and blowing air. Next, a ball is moved inside of the pipe 1 to form a coating layer 4 of the synthetic resin coating material to the inner face of the pipe. After the formation of the coating layer 4, an inorganic type coating material 5 is injected into the inside of the pipe 1 and air is blown to the inside of the pipe 1 to apply the inorganic type coating material 5 to the surface of the coating layer 4. Successively, a ball 6 is moved inside of the pipe 1 to form an inorganic coating layer 7 on the surface of the coating layer 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to an inner surface coating film of a pipe such as a water pipe and a method for forming the same.

Room temperature curing type two-component epoxy resin coatings have been widely used for coatings on the inner surface of water pipes. The reason is that it is not corrosive, is more durable than iron, and is suitable for reinforcing deteriorated iron pipes, and is excellent in preventing the progress of corrosion of dissimilar metal joints in stainless steel pipes, etc. Is mentioned.
Japanese Patent No. 3279634

  However, from the viewpoint of ensuring the safety of water, there is a problem in the use of epoxy resin. In order to avoid elution of environmental hormones from the epoxy resin, the two liquids (the main agent is bisphenol A and the hardener is an amine) must be thoroughly mixed at a predetermined ratio, which is almost impossible. Therefore, elution of environmental hormones due to errors in two-component mixing is inevitable. Further, when used continuously for a long period of time, moisture absorption of the epoxy resin proceeds, and there is a concern that error substances may elute with age deterioration and cause long-term water pollution.

In order to eliminate the above-mentioned conventional problems, according to the present invention,
In a tube comprising a first coating layer of a synthetic resin paint formed on the inner surface of the tube as an in-pipe coating, and an inorganic second coating layer formed on the surface of the first coating layer A coating is provided.

An inorganic material can be added to the synthetic resin paint.
The synthetic resin paint can be a room temperature curable resin paint.
The synthetic resin paint can be a room temperature curable two-component epoxy resin paint.

Alternatively, the synthetic resin paint may be a room temperature curing type one-part epoxy resin paint.
On the other hand, the inorganic coating layer can be formed from a room temperature curable inorganic coating.

The inorganic coating layer can be mainly composed of silicon.
The inorganic coating layer may have ceramic as a main component.
Moreover, according to the present invention,
In the method of forming the coating film in the tube,
Injecting synthetic resin paint into the tube;
Applying the synthetic resin paint to the inner surface of the tube by flowing air inside the tube;
Moving the ball into the tube to form the first coating layer of the synthetic resin paint on the inner surface of the tube;
After forming the first coating layer, injecting an inorganic paint into the tube;
Applying the inorganic paint to the surface of the first coating layer by flowing air inside the tube;
Moving a ball into the tube to form an inorganic second coating layer on the surface of the first coating layer;
There is also provided a method for forming an in-tube coating comprising:

When moving the ball, air may flow along the moving direction of the ball.
Applying the synthetic resin paint to the inner surface of the pipe by flowing air into the pipe; and moving the ball into the pipe to form the first coating layer of the synthetic resin paint on the inner surface of the pipe. And the step of applying the inorganic coating material to the surface of the first coating layer by flowing air inside the tube, and moving the ball into the tube to move the first coating layer The step of forming the inorganic second coating layer on the surface may be performed simultaneously.

Moreover, according to the present invention,
In a method of forming a coating film in the pipe for a pipe connected to a plurality of branch pipes
The synthetic resin paint is injected into the interior of the arbitrarily selected start end pipe, and then the synthetic resin paint is applied to the inner surface of the first branch pipe by flowing air into the start end pipe, and then the synthetic resin paint The ball is moved from the uncoated pipe side into the first branch pipe to form a coating layer of synthetic resin paint on the inner surface of the first branch pipe. Thereafter, these operations are sequentially repeated for each pipe line. For the final pipeline, after the synthetic resin paint is applied, the ball is moved from the opening end into the pipe to form a synthetic resin paint film layer. Forming a first coating layer;
Thereafter, the surface of the first coating layer on the inner surface of the first branch pipe by injecting an inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe Then, an inorganic coating is applied to the surface of the first coating layer on the inner surface of the first branch pipe by moving the ball into the first branch pipe from the pipe side where the inorganic paint is not applied. A film layer is formed, and thereafter, these operations are sequentially repeated for each pipeline. For the final pipeline, the inorganic coating film is moved by moving the ball into the pipe from the opening end side after applying the inorganic paint. Forming an inorganic second coating layer on the surface of the first coating layer on the inner surface of all conduits by forming a layer; and
There is also provided a method for forming an in-tube coating comprising:

Furthermore, according to the present invention,
In a method of forming a coating film in a pipe for a pipe to which a plurality of branch pipes are connected,
The synthetic resin paint is applied to the inner surface of the first branch pipe by injecting the synthetic resin paint into the arbitrarily selected start end pipe, and then flowing air into the start end pipe, and the adjacent branch pipe The synthetic resin paint is discharged from the opening end of the adjacent branch pipe, and then the synthetic resin paint is applied to the inner surface of the adjacent branch pipe by flowing air into the adjacent branch pipe, and then the first branch pipe and the adjacent branch pipe By moving the ball into each pipe line coated with synthetic resin paint on the branch pipe, a coating layer of synthetic resin paint is formed on the inner surface of these pipe lines. To form a first coating layer of synthetic resin paint on the inner surface of all the pipe lines,
Then, the surface of the first coating layer on the inner surface of the first branch pipe is injected by injecting an inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe. An inorganic paint is applied to the first branch pipe, and then a ball is moved into the first branch pipe to form an inorganic coating layer on the surface of the first coating layer on the inner surface of the first branch pipe. Repeating these operations sequentially for the channels to form an inorganic second coating layer on the surface of the first coating layer on the inner surface of all the conduits;
There is also provided a method for forming an in-tube coating comprising:

  When moving the ball to form the first coating layer, air is flowed at a predetermined air volume along the moving direction of the ball that has passed through the first branch pipe, and the moving direction of the ball By causing air to flow in the opposite direction with the air volume equal to or greater than the predetermined air volume, the air flows toward the opening end of the adjacent branch pipe, and the ball is guided to the adjacent branch pipe. You may do it.

A step of polishing the inner surface of the tube may be further included prior to injecting the synthetic resin paint into the tube.
One end of a string may be attached to the ball, and the movement of the ball may be controlled while gripping the other end of the string.

The ball may be elastic and have an outer diameter larger than the inner diameter of the tube.
Alternatively, the ball to which one end of the string is attached may have an outer diameter smaller than the inner diameter of the tube and a shape that can be swung in the tube by air flowing along the moving direction of the ball. Good.

In the method for forming a coating film in a tube, an inorganic material may be added to the synthetic resin paint.
In the method for forming a coating film in a tube, the synthetic resin paint can be a room temperature curable resin paint.

In the method for forming a coating film in a tube, the synthetic resin paint can be a room temperature curing type two-component epoxy resin paint.
Alternatively, in the method for forming an in-tube coating film, the synthetic resin paint may be a room temperature curing type one-part epoxy resin paint.

On the other hand, in the method for forming an in-tube coating film, the inorganic coating material can be a room temperature curable inorganic coating material.
In the method for forming a coating film in a tube, the inorganic coating material may contain silicon as a main component.

In the method for forming a coating film in a tube, the inorganic coating material may contain ceramic as a main component.
There are a wide variety of pipe materials mentioned in this application, such as iron, steel, and plastic. The material of the inner surface of the pipe is not only the material of these pipe materials but also the material of the material used for the lining (plastic, mortar). Etc.).

  The inorganic paint may contain an organic component that disappears in the process until the inorganic coating layer is formed.

  According to the coating film in the tube of the present invention, the contact between the synthetic resin such as epoxy resin and the water flowing in the tube is hindered by the inorganic coating layer, so that elution of environmental hormones while utilizing the excellent properties of the synthetic resin. Can be prevented almost completely and water pollution can be effectively prevented. In general, inorganic paints perform better than epoxy resins in heat resistance, alkali resistance, acid resistance, and solvent resistance after the formation of an inorganic coating layer. It is effective as a paint for inner surface coatings. Examples of the present invention include inorganic coatings for internal coatings such as water pipes as well as in-pipe coatings with a two-layer structure consisting of a coating layer of a synthetic resin coating and an inorganic coating layer. Not known to.

By adding an inorganic material to the synthetic resin paint, the familiarity with the inorganic paint can be improved.
By using a room temperature curable resin paint as the synthetic resin paint and a room temperature curable inorganic paint as the inorganic paint, the coating film can be formed more easily.

Examples of room temperature curable resin paints include two-part epoxy resin paints and one-part epoxy resin paints.
When an inorganic paint having silicon or ceramic as a main component is used, it has an excellent aspect that water does not permeate semipermanently even with a thickness of 1/5 or less of an organic paint.

  Moreover, according to the method for forming a coating film in a tube of the present invention, a uniform and smooth coating film can be formed. Inorganic coatings have little viscosity because they contain almost no organic matter to increase viscosity. Therefore, in the method of applying by flowing air (pressing or sucking) after injecting the paint into the pipe, the dripping paint remains as a paint pool in the lower part due to low viscosity, and the curing time varies. On the contrary, application may not be possible or insufficient portions may appear. According to the method of the present invention, these problems can be solved by applying using a ball.

By moving air along the ball moving direction (pumping or sucking) when moving the ball, the application work can be accelerated.
If the step of applying the paint by flowing air into the tube and the step of moving the ball into the tube to form the coating layer are performed simultaneously, the working efficiency will be greatly improved.

  When applying the method of the present invention to a pipe to which a plurality of branch pipes are connected, the ball is moved from the pipe-uncoated pipe side to each pipe line to form a coating film, thereby being pushed out to the ball. The extra paint does not remain in the pipe and does not increase the pipe resistance during fluid flow. In addition, since a coating film is formed for each pipe line, even if the pipe has a long total extension, the work is not restricted by the difference in the gelation time of the paint.

For piping to which a plurality of branch pipes are connected, it is possible to increase the efficiency by applying a method of moving the ball from the side where the paint has already been applied.
By polishing the inner surface of the tube prior to injecting the synthetic resin paint into the tube, the coating film forming method of the present invention can be applied to an existing tube.

  By attaching one end of the string to the ball and controlling the movement of the ball while gripping the other end side of the string, it is possible to prevent a situation in which the ball is preceded and form the coating layer appropriately.

  By using a large ball with elasticity, the ball will be applied while closely contacting the inner wall of the tube, so apply the paint to the specified while removing the excess paint without leaving in the tube, Next, a uniform thin coating film having a thickness larger than the inner diameter of the straight pipe can be formed from the pipe-coated non-coated pipe side.

  If the outer diameter of the ball to which one end of the string is attached is smaller than the inner diameter of the tube and the coating film is formed while the ball is swiveled in the tube, even coating can be applied even in places where the tube diameter changes. A film can be formed. The same ball can be used for tubes having different inner diameters.

  1 to 3 are schematic cross-sectional views sequentially showing the process of forming an in-tube coating film by the method according to the present invention. The pipe 1 to which the present invention is applied is made of iron, vinyl chloride or other materials, and its uses are diverse, such as water pipes and drain pipes.

  The present invention can be applied to an existing pipe having no coating film on the inner surface, but can also be applied to an existing pipe. When applied to existing piping, the inner surface of the tube is first polished. When a coating film such as an epoxy resin is already formed on the inner surface of the existing pipe, this coating film is also polished.

  Based on FIG. 1, the process of forming the coating layer of the synthetic resin paint on the inner surface of the tube 1 will be described. As the paint for forming the coating layer, for example, a room temperature curable two-part epoxy resin paint or a room temperature curable one-part epoxy resin paint can be used. It is also possible to use other room temperature curable synthetic resin paints or synthetic resin paints that are not room temperature curable.

Moreover, you may add an inorganic material to a synthetic resin coating material. This is for improving familiarity with an inorganic coating layer to be described later.
The basic coating layer forming process with a synthetic resin coating is known per se. That is, after injecting the synthetic resin paint 2 into the tube 1, the synthetic resin paint 2 is applied to the inner surface of the tube 1 by flowing air (pressure feeding or suction) into the tube 1. Subsequently, the ball 3 is moved into the tube 1 from the right side as viewed in FIG.

  The illustrated ball 3 has an outer diameter slightly smaller than the inner diameter of the tube 1 and is made of a resilient material. The ball 3 does not have to be a perfect sphere, and may have an elliptical cross section. Further, the outer diameter of the ball 3 may be the same as or larger than the inner diameter of the tube 1. In that case, the ball 3 moves in the tube 1 in a state of being deformed by its elasticity. Furthermore, the ball may be shaped like a pig.

  By flowing air in the moving direction of the ball 3, progress can be promoted while controlling the moving speed of the ball 3. When the ball 3 moves in the pipe 1, the coating of the paint caused by the air jet flow flowing forward (in the traveling direction of the ball 3) due to the iron action of the ball 3 itself and from the gap between the ball 3 and the inner wall of the pipe 1. By the annular flow, a uniform and smooth coating layer 4 is formed on the inner surface of the tube 1.

When air is allowed to flow inside the tube 1, not only the step of applying the synthetic resin paint 2 to the inner surface of the tube 1 but also the step of moving the ball 3 into the tube 1 may be performed simultaneously.
Further, when the ball 3 is moved into the tube 1, one end of a string (not shown) may be attached to the ball 3 and the movement of the ball 3 may be controlled while gripping the other end of the string. If it does in this way, the coating film layer 4 with a more beautiful finish can be formed. In particular, when the step of applying the synthetic resin paint and the step of moving the ball 3 are performed simultaneously when air is flowed, more precise control of ball movement is performed so that the movement of the ball 3 does not precede the application. is important.

  The ball to which one end of the string is attached has an outer diameter smaller than the inner diameter of the tube 1 and can have a shape capable of turning inside the tube 1 by air flowing along the moving direction of the ball. Typical shapes of such a ball include a non-spherical spherical shape and a portion including a propeller or screw structure. Such a ball swirls in the tube 1 in response to the air flow, thereby forming a coating layer while contacting the inner wall surface of the tube 1. Accordingly, even at a place where the tube diameter changes, such as a joint portion, the turning ball can move following the shape change of the inner surface of the tube, so that a uniform coating layer can be formed. Also, it is possible to use balls having the same diameter for several tubes having different inner diameters within a certain range.

  In the step shown in FIG. 2, an inorganic coating layer is formed on the surface of the coating layer 4 of the synthetic resin coating 2. The inorganic paint used for forming the coating layer is preferably a room-temperature-curable inorganic paint from the viewpoint of workability, but it is also possible to use an inorganic paint that is not room-temperature-curable. Examples of the inorganic paint used include those containing silicon as the main component, such as glass, and those containing ceramic as the main component. However, it is not limited to these examples. The inorganic coating material can contain an organic component necessary for forming the coating layer. There is no problem if such an organic component disappears in the process until the inorganic coating layer is formed. When the inorganic coating layer is formed on the surface of the coating layer 4 of the synthetic resin coating 2, it prevents the environmental hormones from eluting from the coating layer 4 of the synthetic resin coating 2 into the tube. Does not elute environmental hormones. In addition, while the inorganic coating layer prevents the coating layer of the synthetic resin paint from becoming powdered with age deterioration, it causes water to become polluted and hardened, while it itself deteriorates. Does not occur.

  The step of forming the inorganic coating layer is similar to the step of forming the coating layer 4 of the synthetic resin paint 2 described with reference to FIG. After the coating layer 4 of the synthetic resin paint 2 is formed on the inner surface of the tube 1, the surface of the coating layer 4 of the synthetic resin coating 2 is injected by injecting the inorganic coating material 5 into the tube 1 and flowing air. An inorganic paint 5 is applied to the surface.

  Subsequently, the ball 6 is moved into the tube 1. In the illustrated embodiment, the outer diameter of the ball 6 is made smaller than the outer diameter of the ball 3 by the thickness of the coating film layer 4. By flowing air in the moving direction of the ball 6, the inorganic coating layer 7 is formed on the surface of the coating layer 4 by the above-described trowel action and the annular flow action of the paint.

  When flowing air, the step of applying the inorganic coating 5 and the step of moving the ball 6 to form the coating layer 7 may be performed simultaneously. Similar to the formation of the layer 4.

  Further, the size and shape of the ball 6 and the control by attaching one end of the string are the same as in the case of the ball 3 described above. Furthermore, the point that the coating layer may be formed while turning the inside of the pipe using a ball having an outer diameter smaller than the inner diameter of the pipe is the same as described above.

In this way, as shown in FIG. 3, an in-tube coating film comprising the coating film layer 4 of the synthetic resin paint 2 and the inorganic coating film layer 7 disposed on the surface is formed on the inner surface of the tube 1. The
Such a double-layer coating film in the pipe can take advantage of the corrosion resistance and durability of the synthetic resin and prevent potential environmental pollution tendency, which is its drawback, by the inorganic coating layer. It is.

When an inorganic material is added to the synthetic resin paint 2 that forms the coating film layer 4, the coating film layer 4 provides a familiar base for the inorganic coating film layer 7.
When the present invention is applied to an existing pipe, the complexity and total extension length due to the connection of a plurality of branch pipes become a problem. In other words, excess paint pushed out to the ball at the junction of the branch pipe remains in the pipe to increase the resistance in the pipe during fluid circulation, or a part of the pipe before the coating layer forming operation with the ball is completed for all the pipes There is a concern that the gelation of the paint before the formation of the coating layer is preceded. In such a case, a coating layer of a synthetic resin paint is formed for each branch pipe, and after a coating layer of a synthetic resin paint is formed for all the pipes, this time, for each branch pipe, An inorganic coating layer may be formed.

  Specifically, a synthetic resin paint is injected into the inside of the pipe at the starting end arbitrarily selected from the piping, and then air is allowed to flow inside the pipe at the starting end. As a result, the synthetic resin paint is applied to the inner surface of the first branch pipe. Next, the ball is moved into the first branch pipe from the pipe side where the synthetic resin paint is not applied. That is, the moving direction of the ball is determined so that the paint pushed out by the ball does not remain in the pipe. By closing the open end of the selected branch pipe and flowing air, or by flowing air along the moving direction of the ball and flowing air in the opposite direction to the moving direction of the ball, It can be moved in a desired direction. After forming the coating layer of the synthetic resin paint on the inner surface of the first branch pipe in this way, these operations are repeated in order for each pipeline. Only for the final-stage pipe line, after the synthetic resin paint is applied, the ball is moved from the opening end side into the pipe to form a coating layer. In this way, a coating layer of synthetic resin paint is formed on the inner surfaces of all the pipes.

  Then, this time, an inorganic coating layer is formed on the surface of the coating layer of the synthetic resin paint, and this is also performed in the same manner as described above. That is, the surface of the coating layer of the synthetic resin paint on the inner surface of the first branch pipe by injecting the inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe Apply inorganic paint to the surface. Next, the ball is moved into the first branch pipe from the pipe side where the inorganic coating material is not applied to form an inorganic coating layer on the surface of the coating layer of the synthetic resin paint on the inner surface of the first branch pipe. Thereafter, these operations are sequentially repeated for each pipeline, and for the final pipeline, after applying the inorganic paint, the ball is moved from the opening end side into the tube to form a coating layer. Thereby, an inorganic coating layer can be formed on the surface of the coating layer of the synthetic resin paint on the inner surface of all the pipes.

  According to such a method, even in complicated piping in which a plurality of branch pipes are connected, an excess paint is not left in the pipe, and the work is not restricted due to a difference in the gelation time of the paint. An in-tube coating film can be formed.

  Similarly, as a method of forming an in-tube coating film on a pipe to which a plurality of branch pipes are connected, there is also a method of forming a coating film layer by inserting balls from the side on which a synthetic resin paint has already been applied. This is a method in which a work having a relatively high viscosity, such as a synthetic resin paint, can be efficiently performed by utilizing the property that the paint tends to bend and flow in the branch direction at the branch portion. In this method, first, a synthetic resin paint is injected into an arbitrarily selected start end pipe. Next, the synthetic resin paint is applied to the inner surface of the first branch pipe by flowing air into the pipe at the start end, and the synthetic resin paint is discharged from the open end of the branch pipe adjacent to the first branch pipe. It is possible to help discharge the synthetic resin paint from the desired branch pipe by closing the open end of the other branch pipe or flowing the opposing air from the pipe side where the synthetic resin paint is not desired to enter. . Next, a synthetic resin paint is applied to the inner surface of the adjacent branch pipe by flowing air into the adjacent branch pipe.

  Next, by moving the ball into each of the pipes coated with the synthetic resin paint of the first branch pipe and the adjacent branch pipe described above, a coating layer of the synthetic resin paint is formed on the inner surface of these pipe lines. To do. A ball is inserted from the opening end of the first branch pipe and air is caused to flow along the moving direction of the ball. Furthermore, while flowing air with a predetermined air volume along the moving direction of the ball that has passed through the first branch pipe, air is flowed with an air volume that is equal to or greater than the predetermined air volume in the direction opposite to the moving direction of the ball. Thus, an air flow toward the open end of the adjacent branch pipe can be generated, and the ball inserted from the open end of the first branch pipe can be easily discharged from the adjacent branch pipe.

  Thereafter, by repeating these operations sequentially for each pipeline, a coating layer of synthetic resin paint is formed on the inner surface of all the pipelines. According to this method, a coating layer of a synthetic resin paint can be formed on two branch pipes at a time, and a considerably long and complicated branch pipe can be processed by continuing this process.

  Unlike synthetic resin paints, inorganic materials have low viscosity, so an inorganic coating layer is formed for each branch pipe. That is, the surface of the coating layer of the synthetic resin paint on the inner surface of the first branch pipe by injecting an inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe Apply inorganic paint to the surface. Next, the ball is moved into the first branch pipe to form an inorganic coating layer on the surface of the coating layer of the synthetic resin paint on the inner surface of the first branch pipe. Thereafter, these operations are sequentially repeated for each pipeline, and an inorganic coating layer is formed on the surface of the coating layer of the synthetic resin paint on the inner surface of all the pipelines.

The schematic sectional drawing for demonstrating the 1st step which forms the coating film in a pipe | tube by this invention. The schematic sectional drawing for demonstrating the 2nd step which forms the coating film in a pipe | tube by this invention. The schematic sectional drawing which shows the coating film in a pipe | tube by this invention with a pipe | tube.

Explanation of symbols

1 tube, 2 synthetic resin coating, 3 balls, 4 coating layer of synthetic resin coating, 5 inorganic coating, 6 balls, 7 inorganic coating layer.

Claims (25)

  A tube comprising a first coating layer of a synthetic resin coating formed on the inner surface of the tube as an inner coating and an inorganic second coating layer formed on the surface of the first coating layer Paint film.   The in-pipe coating film according to claim 1, wherein an inorganic material is added to the synthetic resin paint.   The in-tube coating film according to claim 1 or 2, wherein the synthetic resin paint is a room temperature curable resin paint.   The in-tube coating film according to any one of claims 1 to 3, wherein the synthetic resin paint is a room temperature curing type two-component epoxy resin paint.   The in-tube coating film according to any one of claims 1 to 3, wherein the synthetic resin paint is a room temperature curing type one-component epoxy resin paint.   The in-pipe coating film according to any one of claims 1 to 5, wherein the inorganic coating film layer is formed of a room temperature curable inorganic coating material.   The pipe coating film according to any one of claims 1 to 6, wherein the inorganic coating film layer contains silicon as a main component.   The pipe coating film according to any one of claims 1 to 6, wherein the inorganic coating layer has ceramic as a main component. In the method of forming the coating film in the tube,
Injecting synthetic resin paint into the tube;
Applying the synthetic resin paint to the inner surface of the tube by flowing air inside the tube;
Moving the ball into the tube to form the first coating layer of the synthetic resin paint on the inner surface of the tube;
After forming the first coating layer, injecting an inorganic paint into the tube;
Applying the inorganic paint to the surface of the first coating layer by flowing air inside the tube;
Moving a ball into the tube to form an inorganic second coating layer on the surface of the first coating layer;
A method for forming an in-tube coating film.   The method for forming an in-tube coating film according to claim 9, wherein when the ball is moved, air is caused to flow along a moving direction of the ball.   Applying the synthetic resin paint to the inner surface of the pipe by flowing air into the pipe; and moving the ball into the pipe to form the first coating layer of the synthetic resin paint on the inner surface of the pipe. And the step of applying the inorganic coating material to the surface of the first coating layer by flowing air inside the tube, and moving the ball into the tube to move the first coating layer The method for forming an in-pipe coating film according to claim 9, wherein the step of forming the inorganic second coating film layer on the surface is simultaneously performed. In a method for forming a coating film in a pipe for a pipe to which a plurality of branch pipes are connected,
The synthetic resin paint is injected into the interior of the arbitrarily selected start end pipe, and then the synthetic resin paint is applied to the inner surface of the first branch pipe by flowing air into the start end pipe, and then the synthetic resin paint The ball is moved from the uncoated pipe side into the first branch pipe to form a coating layer of synthetic resin paint on the inner surface of the first branch pipe. Thereafter, these operations are sequentially repeated for each pipe line. For the final pipeline, after the synthetic resin paint is applied, the ball is moved from the opening end into the pipe to form a synthetic resin paint film layer. Forming a first coating layer;
Thereafter, the surface of the first coating layer on the inner surface of the first branch pipe by injecting an inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe Then, an inorganic coating is applied to the surface of the first coating layer on the inner surface of the first branch pipe by moving the ball into the first branch pipe from the pipe side where the inorganic paint is not applied. A film layer is formed, and thereafter, these operations are sequentially repeated for each pipeline. For the final pipeline, the inorganic coating film is moved by moving the ball into the pipe from the opening end side after applying the inorganic paint. Forming an inorganic second coating layer on the surface of the first coating layer on the inner surface of all conduits by forming a layer; and
A method for forming an in-tube coating film. In a method of forming a coating film in the pipe for a pipe connected to a plurality of branch pipes
The synthetic resin paint is applied to the inner surface of the first branch pipe by injecting the synthetic resin paint into the arbitrarily selected start end pipe, and then flowing air into the start end pipe, and the adjacent branch pipe The synthetic resin paint is discharged from the opening end of the adjacent branch pipe, and then the synthetic resin paint is applied to the inner surface of the adjacent branch pipe by flowing air into the adjacent branch pipe, and then the first branch pipe and the adjacent branch pipe By moving the ball into each pipe line coated with synthetic resin paint on the branch pipe, a coating layer of synthetic resin paint is formed on the inner surface of these pipe lines. To form a first coating layer of synthetic resin paint on the inner surface of all the pipe lines,
Then, the surface of the first coating layer on the inner surface of the first branch pipe is injected by injecting an inorganic paint into the arbitrarily selected start end pipe and then flowing air into the start end pipe. An inorganic paint is applied to the first branch pipe, and then a ball is moved into the first branch pipe to form an inorganic coating layer on the surface of the first coating layer on the inner surface of the first branch pipe. Repeating these operations sequentially for the channels to form an inorganic second coating layer on the surface of the first coating layer on the inner surface of all the conduits;
A method for forming an in-tube coating film.   When moving the ball to form the first coating layer, air is flowed at a predetermined air volume along the moving direction of the ball that has passed through the first branch pipe, and the moving direction of the ball By causing air to flow in the opposite direction with the air volume equal to or greater than the predetermined air volume, the air flows toward the opening end of the adjacent branch pipe, and the ball is guided to the adjacent branch pipe. The method for forming an in-tube coating film according to claim 13.   The method for forming a coating film in a tube according to any one of claims 9 to 14, further comprising a step of polishing an inner surface of the tube before injecting the synthetic resin paint into the tube.   The method for forming an in-tube coating film according to any one of claims 9 to 15, wherein one end of a string is attached to the ball, and movement of the ball is controlled while gripping the other end side of the string.   The method for forming a coating film in a tube according to any one of claims 9 to 16, wherein the ball has elasticity and an outer diameter larger than an inner diameter of the tube.   The ball to which one end of the string is attached has an outer diameter smaller than the inner diameter of the tube, and has a shape that can be swung in the tube by air flowing along the moving direction of the ball. The method for forming an in-tube coating film according to claim 16, wherein the coating film is formed while rotating while contacting the inner wall surface of the tube.   The method for forming an in-tube coating film according to any one of claims 9 to 18, wherein an inorganic material is added to the synthetic resin paint.   The in-tube coating film according to any one of claims 9 to 19, wherein the synthetic resin paint is a room temperature curable resin paint.   The in-tube coating film according to any one of claims 9 to 20, wherein the synthetic resin paint is a room temperature curing type two-component epoxy resin paint.   The in-tube coating film according to any one of claims 9 to 20, wherein the synthetic resin paint is a room temperature curing type one-component epoxy resin paint.   The in-tube coating film according to any one of claims 9 to 22, wherein the inorganic coating material is a room temperature curing inorganic coating material.   The in-tube coating film according to any one of claims 9 to 23, wherein the inorganic coating material contains silicon as a main component. The in-tube coating film according to any one of claims 9 to 23, wherein the inorganic coating material contains ceramic as a main component.

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