JP4611779B2 - Piping lining apparatus and piping lining method - Google Patents

Description

  The present invention relates to a pipe lining apparatus and a pipe lining method for coating an inner wall of a pipe for repairing or maintaining a drain pipe or a buried pipe.

Numerous foreign substances such as food residues, oils and fats, used detergents, hair, gravel, and earth and sand adhere to and accumulate in pipes such as buried pipes and drainage pipes that are placed inside or outside the building. Together with this, a scale is formed. In order to maintain the function and hygiene of the piping, it is necessary to completely remove the scale deposited and accumulated in the piping, and the piping is periodically cleaned using a cleaning device. After the piping is cleaned, from the viewpoint of durability and the like, the coating pig is used as a lining device so that the inner wall portion of the piping is coated as a lining (see, for example, Patent Document 1). This coating pig is composed of a cylindrical body with a spiral groove engraved, receives an air flow by the negative pressure supplied into the pipe, and performs a complex eccentric rotational motion involving rotation and revolution. The paint layer is formed by pressing the paint onto the inner surface of the pipe by the eccentric rotational movement of the paint pig.
Another lining device for the inner surface of a pipe includes a pipe provided with a paint injection pipe that receives compressed air from a compressor via an air hose (see, for example, Patent Document 2). This pipe is detachably connected to the lining pipe by a pipe joint provided with a film-like blocking means for blocking the inner diameter passage. During the lining operation, the paint pressed by the compressed air from the compressor breaks the blocking means. As a result, the bulk paint filled in the pipe is supplied as a plug flow from the pipe joint to the lining pipe, and the inner surface of the lining pipe is painted.
JP 2003-284899 A JP-A-10-174923

In the painting pig of Patent Document 1, the edge of the groove functions like a scraper when painting pipes, and it is intended to scrape excess paint or redistribute it to parts with insufficient paint to achieve uniform painting is doing. However, in buildings such as apartment buildings (condominiums), a branch pipe branched from the main pipe is embedded in the fire wall that divides the room, so a paint layer is applied from the indoor pipe to the inner wall of the branch pipe with a painting pig. Some are difficult to form. In general, since the branch pipe is connected to the pipe, in the lining device of Patent Document 2, it is impossible to connect the pipe provided with the paint injection pipe to the branch pipe with a pipe joint. Even if this type of lining device is used, a coating layer cannot be formed on the inner wall portion of the branch pipe through the pipe on the indoor side of the apartment house.
For this reason, in order to form a paint layer on the branch pipe, a coating robot is continuously introduced from the main pipe to the branch pipe to paint the branch pipe. The pipe diameter of the branch pipe is 200 mm or less. Then, there is a situation where the branch pipe is too narrow to introduce the painting robot.
In this case, it is necessary to dismantle part of the fire wall to expose part of the branch pipe and cut it, and it is necessary to paint the branch pipe from the outside of the room. is there. As a result, it takes labor and time to dismantle the fire wall and cut the branch pipe, and to dismantle and repair it after cutting, resulting in increased costs and poor painting efficiency, which may greatly reduce the workability. .

  The present invention has been made in view of the above circumstances, and its purpose is to apply the coating from the indoor piping to the branch pipe with a relatively simple operation, and the painting work can be done quickly and quickly, and the coating efficiency is good. Accordingly, an object of the present invention is to provide a piping lining apparatus and a piping lining method that improve workability and contribute to cost reduction.

(About Claim 1 and Claim 6 )
When painting the branch pipe branched from the pipe from the inside of the pipe, the cutter is inserted into the pipe by remote control in order to cut off the coating film formed at the boundary between the pipe and the branch pipe by painting inside the pipe. Touch the paint film part. After excising the coating film part, the tool is inserted into the pipe by remote control to form a paint layer on the inner wall part of the branch pipe from the boundary part. At this time, the annular cloth member impregnated with the paint is pressed against the inner wall portion of the branch pipe while being turned upside down by the application tool.
Since the coating film portion formed at the boundary between the pipe and the branch pipe is cut by a cutter by remote control, there is no obstacle to the painting in the branch pipe from the pipe, for example, the main pipe to the branch pipe. For this reason, it is possible to apply the coating by inserting the tool into the pipe from the indoor side and pressing the annular cloth member from the boundary part into the branch pipe while reversing the front and back surfaces. As a result, it is possible to paint pipes, for example, main pipes to branch pipes, with relatively simple operations, and the painting work can be done quickly and quickly, improving work efficiency and reducing costs. Contribute to.
Moreover, a tool has a flexible cylinder body part inserted in piping. The extension pipe part is integrally formed on the outer side of the cylindrical body part and is connected so as to be expandable and contractable by air pressure. The extended pipe part is stored in the tube body part with the cloth member inserted in the outer peripheral part turned upside down. At the time of painting, the extension pipe part is extended from the cylinder body part to the outside by air pressure, and the cloth member is reversed together with the extension pipe part and pressed against the inner wall part of the branch pipe.
In this case, the tool is advantageous in terms of cost because it requires a relatively simple configuration such as a cylindrical body part and an extendable pipe part.
Moreover, the plug part in which the insertion hole was formed is connected and fixed to the terminal part of the extension pipe part. The extended pipe portion after painting is collected by pulling the control wire passed through the insertion hole and secured by the stopper. Hot air for drying is supplied into the cylinder body during painting, and the hot air is blown evenly onto the cloth member in the process of escaping through the gap between the control wire and the insertion hole.
Since hot air is supplied into the tube body portion during coating and the hot air is evenly blown onto the cloth member, there is an advantage that the paint on the cloth member adhered and formed in the pipe can be dried in a short time. Since the control wire is connected to the extension pipe part, it is reasonable that the control wire can be recovered after reversing the extension pipe part by drawing the control wire after the hot air is blown.

(About Claim 2 and Claim 7 )
The cutter is inserted substantially parallel to the pipe from the shaft member. The drive motor is mounted on the shaft member and drives the blade portion. The control motor is attached to the shaft member and aligns the blade portion with the coating film portion by adjusting the rotation of the shaft member. The balloon member is provided on the shaft member so as to be expandable / contractable, and the blade portion can be moved forward and backward relative to the coating film portion existing at the boundary portion by adjusting the air pressure.
In this case, the cutter has a relatively simple configuration such as a shaft member, a drive motor, a control motor, and a balloon member, and the blade portion can be aligned with the coating film portion, which is advantageous in terms of cost.

(About claim 3 and claim 8 )
An annular flange portion that covers the outer side portion of the cylindrical body portion in a contact state is integrally provided at the base end portion of the cloth member. For this reason, after the reversal of the cloth member, the flange portion can be attached to the boundary portion between the pipe and the branch pipe, and coating can be performed with a good finish.

(About claim 4 and claim 9 )
A circular elastic wire is embedded in the outer peripheral edge of the flange part to maintain the shape, so even if the flange part is made of cloth, the flange part does not keep its desired shape and the outside of the cylinder body part Touch the part.

(About Claim 5 and Claim 10 )
The elastic wire includes a concentric circular outer ring portion and a central small ring portion, and radial spokes are provided in a connected state between the outer ring portion and the small ring portion. For this reason, the flange part of a cloth member is reinforced and it does not sag easily and can paint on a branch pipe quickly with a good finish.

  When painting a horizontal main pipe as a branch pipe, the extension pipe part is extended from the inside of the cylinder body to the outside by air pressure from the indoor side, and the cloth member is reversed together with the extension pipe part on the inner wall part of the horizontal main pipe Apply the paint efficiently from the vertical mains to the horizontal mains by pressing.

A first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1 showing an example of a drain pipe of a building H such as an apartment house, the building H includes a vent pipe 1, a sewage main pipe 2 and a main pipe 3 as pipes. The ventilation pipe 1, the sewage main pipe 2, and the vertical pipe 3 communicate with the external tub 5 from the horizontal drawing main pipe 4 as a branch pipe. During cleaning, dust, scales, and other deposits that have flowed down from the pipes such as the vent pipe 1, the sewage main pipe 2, and the main pipe 3 and the horizontal main pipe 4 cause fluid such as air and pulverized water to flow through the pipe. By this, it is collect | recovered by the universal piping renovation vehicle (VacL machine) 6 from the external dredge 5. In this case, instead of the universal pipe rehabilitation vehicle 6, a fluid may be flowed into the pipe using a compressed air supply device (not shown) such as a compressor.

  After cleaning the pipe, from the viewpoint of durability and hygiene, for example, a reversing lining device (not shown) is used to coat the inner wall 3a of the main pipe 3 to form a paint layer R having a predetermined thickness. To do. At this time, as shown in FIG. 2, a substantially oval coating film portion 8 is formed at the boundary portion between the vertical main tube 3 and the horizontal main tube 4 by coating the vertical main tube 3. For this reason, in order to paint the horizontal main pipe 4, it is necessary to cut the coating film part 8 by a cutter 9 described later.

  As shown in FIG. 3, the cutter 9 includes a shaft member 10 that is inserted substantially parallel to the main pipe 3 and a drive motor 12 that is attached to the shaft member 10 and drives the blade portion 11. A piping lining device is configured together with the tool 17. The shaft member 10 has a control motor 13 that aligns the blade portion 11 with the coating film portion 8 by rotating and adjusting itself around the axis. Balloon members 14 and 15 are attached to the left and right sides of the shaft member 10 so as to be capable of expanding and contracting and allowing the blade portion 11 to move forward and backward with respect to the boundary portion by adjusting the air pressure. The cutter 9 can be remotely operated up and down by a hanging rope W or the like under monitoring of a small camera (not shown). In addition, although the blade part 11 of the cutter 9 is formed by a diamond cutter, a jet injection type ultra-high pressure water cutter, a rotary thread saw, a drill type cutter, or the like may be used.

  After cutting the coating film part 8 with the cutter 9, in order to apply | coat the inner wall part 4a of the horizontal drawing main pipe 4, the application tool 17 shown in FIG. 4 and FIG. 5 is used. As shown in FIG. 4, the application tool 17 is integrally formed with a flexible cylinder body 18 that is connected to the air supply pipe 20 and inserted into the main pipe 3, and an outer part of the cylinder body 18. A rubber extending pipe portion 19 connected in a substantially right angle direction so as to be expandable and contractible by air pressure is provided. An annular cloth member 21 impregnated with paint is attached to the outer peripheral portion of the extending pipe portion 19 as a toughness cloth so that the front and back can be reversed.

  The cloth member 21 before painting is housed in the tube body portion 18 together with the extension tube portion 19 as shown by a two-dot chain line in FIG. An annular flange portion 21 a corresponding to the opening 8 a formed by cutting the coating film portion 8 is integrally provided at the base end portion of the cloth member 21 as shown in FIG. In contact. The application tool 17 can be remotely operated in the vertical direction by a hanging rope N or the like under the monitoring of a small camera. A circular elastic wire 22 is embedded in the outer peripheral edge portion of the flange portion 21a by stitching or the like to maintain the shape, and the flange portion 21a is held in contact with the outer side portion of the cylindrical body portion 18 without sagging. is doing.

In the above configuration, the coating layer R is formed on the inner wall portion 3a of the main pipe 3 and dried and cured using a drying means such as hot air or hot water, and then horizontally drawn using the cutter 9 by the piping lining method of the present invention. The inner wall 4a of the main pipe 4 is painted. That is, as shown in FIG. 3, the cutter 9 is inserted into the vertical main pipe 3 from the indoor side by a remote operation, and the position of the cutter 9 is adjusted to bring the blade portion 11 into contact with the coating film portion 8. Deploy.

  At this time, the blade portion 11 is rotationally driven by the drive motor 12, and the shaft member 10 is rotated and adjusted in the left-right direction by the control motor 13 to align the blade portion 11 with the coating film portion 8. By alternately supplying and discharging air to and from the balloon members 14 and 15, the balloon members 14 and 15 are alternately advanced and retracted by expansion and contraction, and the blade portion 11 is moved back and forth to cut out the coating film portion 8. That is, the vertical movement adjustment by the hanging rope W or the like and the front-back movement adjustment by the balloon members 14 and 15 are performed, and the coating film portion 8 is removed by the blade portion 11 to expose the substantially oval opening 8a.

  After the coating film portion 8 is removed, the cutter 9 is taken out from the main pipe 3, and a tool 17 is used to apply the coating to the inner wall portion 4a of the horizontal drawing main pipe 4 based on the pipe lining method of the present invention. That is, as shown in FIG. 5, the extended pipe portion 19 of the tool 17 is stored together with the cloth member 21 in the cylinder body portion 18 so that the cylinder body portion 18 is turned upside down from the indoor side. Insert into. By adjusting the suspension rope N or the like, the flange portion 21a of the fabric member 21 is aligned with the opening 8a.

  In this state, as shown in FIG. 6, air is pressure-fed to the cylindrical body portion 18 through the air supply pipe 20. As a result, the barrel portion 18 is elastically brought into contact with the paint layer R of the vertical main pipe 3 by expansion to hold the application tool 17 in position, and the flange portion 21a is brought into contact with the outer peripheral edge portion of the opening 8a. Along with this, the extension pipe part 19 receives air pressure and extends outside from the cylinder body part 18 while being inverted together with the cloth member 21, and advances into the horizontal main pipe 4 through the opening 8a. When the air pressure in the extension pipe part 19 reaches a predetermined pressure, the extension pipe part 19 presses the cloth member 21 against the inner wall part 4a of the horizontal main pipe 4 with a sufficient expansion pressure as shown in FIG. Adhere as.

  After the cloth member 21 is attached as a paint layer to the inner wall 4a of the horizontal main pipe 4, if the air pressure is removed from the cylinder body 18, the cylinder body 18 contracts to its original size as shown in FIG. The elastic contact with the paint layer R is released. Along with this, the inside of the extension pipe part 19 is sucked so as to be a negative pressure, and the extension pipe part 19 inverts the front and back independently while the cloth member 21 is attached to the inner wall part 4a. It is stored in. Thereafter, when the tool 17 is pulled out from the vertical main pipe 3, the flange portion 21a covers the boundary between the vertical main pipe 3 and the horizontal main pipe 4 as shown in FIG. It is possible to obtain the horizontally drawn main pipe 4 that is well coated with the member 21.

  In this way, the coating film portion 8 formed at the boundary between the vertical main pipe 3 and the horizontal main pipe 4 is cut by the cutter 9 by remote control, so that the painting in the horizontal main pipe 4 can be raised indoors. The upper obstacle to the horizontal main pipe 4 through the main pipe 3 is eliminated. For this reason, the application tool 17 can be inserted into the vertical main pipe 3 from the indoor side, and can be applied by being pressed against the inner wall portion 4a while reversing the annular cloth member 21 into the horizontal main pipe 4 from the boundary portion. . As a result, it is possible to paint from the main main pipe 3 to the horizontal main pipe 4 indoors with a relatively simple operation, the painting work can be done quickly and quickly, and the work efficiency is improved by improving the painting efficiency. Contribute to cost reduction. In addition, since the cutter 9 and the tool 17 are slimmed in a simple configuration, even when the diameter of the horizontal main pipe 4 is as small as 65 mm to 200 mm, the horizontal main pipe 4 can be painted. The scope of application is greatly widened.

  FIG. 10 shows a second embodiment of the present invention. Example 2 is different from Example 1 in that the elastic wire 22 is configured in a double ring shape to reinforce the flange portion 21a. That is, the elastic wire 22 is composed of a circular outer ring portion 22a and a small ring portion 22b in the center portion arranged concentrically as shown in FIGS. 10 (a) and 10 (b), and the outer ring portion 22a and the small ring portion. Radial spokes 22c are provided in a connected state between 22b.

FIG. 11 shows Embodiment 3 of the present invention. The difference between the third embodiment and the first embodiment is that the plug portion 23 having the insertion hole 23a is connected and fixed to the terminal portion 19a of the extension tube portion 19 as shown in FIG. .
As shown in FIGS. 11A and 11B, the distal end portion 24a of the control wire 24 is inserted into the insertion hole 23a of the plug portion 23 to fix the stopper 25 for retaining.

At the time of painting, when hot air generated by heating the air by the halogen lamp 26 shown in FIG. 11 (c) is supplied to the cylindrical body portion 18, the hot air flows between the control wire 24 and the insertion hole 23a via the flange portion 21a. In the process of escaping from the slight gap, hot air is blown evenly onto the cloth member 21.
For this reason, the advantage that the coating material of the cloth member 21 adhered and formed in the pipe can be dried in a short time is obtained. Since the control wire 24 is connected to the extension pipe part 19, after the hot air is blown, the control wire 24 is pulled out so that the extension pipe part 19 can be recovered in the cylinder body part 18 while being reversed again. Is. In this case, the hot air for drying is the same as the air supplied to the cylinder body 18 when the extending pipe part 19 and the cloth member 21 are reversed.
Note that the halogen lamp 26 having a relatively long life is used as a heating source for air. However, the halogen lamp 26 is not limited to the halogen lamp 26, and various types such as an electric resistance wire can be used. That's fine.

(Modification)
When coating the inner wall portion 3a of the main pipe 3 to form the coating layer R having a predetermined thickness, an inversion type lining device is used. However, as long as the inner wall portion 3a can be coated, the inversion type lining device is not limited. The extension pipe part 19 of the cylinder body part 18 does not necessarily have to be at right angles to the cylinder body part 18, and can be formed at a desired angle according to the inclination of the horizontal main pipe 4. For the inner wall 4a of the horizontal main pipe 4, the operation of inserting the tool 17 into the vertical main pipe 3 is repeated a plurality of times, so that the undercoat, intermediate coat, top coat and finish coat are applied to the horizontal main pipe 4. It is also possible to perform stepwise overcoating separately. The horizontal main pipe 4 as a branch pipe may be any pipe that needs to be coated in the pipe, including drainage pipes and buried pipes, air conditioning ducts, exhaust ducts (industrial ducts, kitchen ducts) and the like. In addition, in concrete implementation of this invention, it can change variously in the range which does not deviate from the summary of this invention.

  The coating film formed at the boundary between the vertical mains and the horizontal mains is cut with a remotely operated cutter, so when painting the horizontal mains through the vertical mains to the horizontal mains indoors No obstacles. A tool can be inserted into the vertical mains from the inside of the room, and the cloth member can be pressed into the horizontal mains and pressed against the inner wall to apply the paint, improving work efficiency and reducing costs. Contribute to. The cutter and tool are slimmed down with a simple configuration. Even when the diameter of the main pipe is as small as 65mm to 200mm, it can be applied to the main pipe and its application range is greatly widened. Therefore, it can greatly contribute to the plumbing repair industry of various buildings including apartment houses.

It is the schematic which shows the piping example of the drain pipe of buildings, such as an apartment house (Example 1). It is an expanded longitudinal cross-sectional view which shows a vertical main pipe and a horizontal drawing main pipe (Example 1). (Example 1) which is an expansion longitudinal cross-sectional view of a vertical main pipe and a horizontal drawing main pipe which show the state which inserted the cutter into the vertical pipe. It is a front view which shows a tool (Example 1). (Example 1) which is an expanded longitudinal cross-sectional view of a vertical main pipe and a horizontal drawing main pipe which show the state which inserted the tool in the vertical main pipe. (Example 1) which is an expansion longitudinal cross-sectional view of a vertical main pipe and a horizontal drawing main pipe which show the state at the time of the start of use of the tool with respect to a horizontal drawing main pipe. It is an expanded longitudinal cross-sectional view of a vertical main pipe and a horizontal drawing main pipe which show the state in use of the tool with respect to a horizontal drawing main pipe (Example 1). It is an expanded longitudinal cross-sectional view of a vertical main pipe and a horizontal drawing main pipe which show the state after use of the tool with respect to a horizontal drawing main pipe (Example 1). FIG. 3 is an enlarged longitudinal sectional view showing a vertical main pipe and a horizontal main pipe after painting is completed (Example 1). (A) is a perspective view of a cloth member, (B) is a front view of an elastic wire (Example 2). (B) is an enlarged vertical cross-sectional view of the main pipe and horizontal main pipe showing the state when the tool starts to be applied to the horizontal main, (b) is an enlarged cross-sectional view of the main part, and (c) is a halogen lamp. (Example 3).

Explanation of symbols

1 Vent pipe (pipe)
2 Sewage main (pipe)
3 Stand main (piping)
3a Inner wall 4 Horizontal main pipe (branch pipe)
4a Inner wall portion 8 Paint film portion 9 Cutter 10 Shaft member 11 Blade portion 12 Drive motor 13 Control motor 14, 15 Balloon member 17 Tool 18 Tube barrel portion 19 Extension tube portion 19a Terminal portion 21 Cloth member 21a Flange portion 22 Elastic wire 22a outer ring part 22b small ring part 22c spoke 23 plug part 23a insertion hole 24 control wire 25 stopper R paint layer

Claims (10)

In the piping lining device for coating the branch pipe branched from the pipe from the inside of the pipe,
A cutter that is inserted into the pipe by remote operation and contacts the coating film part in order to excise the coating film part formed at the boundary between the pipe and the branch pipe by painting in the pipe; After cutting the membrane part, it has a tool that is inserted into the pipe by remote operation and forms a paint layer on the inner wall part of the branch pipe from the boundary part,
The tool is
A flexible cylinder body inserted into the pipe;
An annular cloth member, which is integrally formed on the outer side of the cylinder body part and is connected so as to be expandable and contractable by air pressure, is inserted into the outer peripheral part and is inserted into the cylinder body part together with the cloth member. It has an extension pipe part that is stored upside down,
At the time of painting, the extension pipe part is extended from the inside of the cylindrical body part to the outside by air pressure, and the cloth member is reversed and pressed against the inner wall part of the branch pipe together with the extension pipe part. And
A plug part having an insertion hole is connected and fixed to the terminal part of the extension pipe part, and the extension after painting is performed by pulling the control wire that is passed through the insertion hole and secured by a stopper. In the process of recovering the outlet pipe part and supplying hot air for drying into the cylinder body part during painting and letting it escape through the gap between the control wire and the insertion hole, the hot air is evenly supplied to the cloth member. pipe lining apparatus, characterized in Rukoto sprayed on. The cutter is
A shaft member inserted substantially parallel to the pipe;
A drive motor that is mounted on the shaft member and drives the blade;
A control motor that is mounted on the shaft member and adjusts the rotation of the shaft member to align the blade portion with the coating film portion;
A balloon member provided on the shaft member so as to be expandable / contractable, and capable of moving forward and backward with respect to the coating film portion existing in the boundary portion by adjusting air pressure. The piping lining apparatus according to 1. Wherein the proximal end portion of the fabric member, the pipe lining device according to claim 1 annular flange portion that covers the outer portion of the tubular body part in contact is characterized that you have provided integrally. The piping lining device according to claim 3 , wherein a circular elastic wire is embedded in the outer peripheral edge of the flange portion in order to maintain the shape . The elastic wire includes a concentric circular outer ring portion and a central small ring portion, and radial spokes are provided in a connected state between the outer ring portion and the small ring portion. The piping lining apparatus according to claim 4 . In the piping lining method for coating the branch pipe branched from the pipe from the inside of the pipe,
In order to excise the coating film portion formed at the boundary between the piping and the branch pipe by painting in the piping, a step of inserting a cutter into the piping by remote operation and contacting the coating film portion;
A step of inserting a tool into the pipe by remote operation after cutting the coating film part to form a paint layer on the inner wall part of the branch pipe from the boundary part;
When operating the tool,
Inserting a flexible tube body into the pipe;
An extension pipe part formed integrally with the outer side part of the cylindrical body part and connected so as to be expandable / contractible by air pressure and having an annular cloth member impregnated with paint inserted into the outer peripheral part together with the cloth member And reversing and storing in the cylinder body part,
At the time of painting, the extension pipe part is extended from the inside of the cylindrical body part to the outside by air pressure, and the cloth member is reversed and pressed against the inner wall part of the branch pipe together with the extension pipe part. And
A plug portion having an insertion hole is connected and fixed to a terminal portion of the extension pipe portion, and the extension after painting is performed by pulling a control wire that is passed through the insertion hole and secured by a stopper. In the process of collecting the pipe part and supplying hot air for drying into the cylinder body part during coating and letting it escape through the gap between the control wire and the insertion hole, the hot air is evenly applied to the cloth member. piping lining how to; and a step of blowing in. When operating the cutter,
Inserting a shaft member substantially parallel to the pipe;
Driving the blade portion with a drive motor mounted on the shaft member;
Adjusting the rotation of the shaft member by a control motor mounted on the shaft member to align the blade portion with the coating film portion;
And a step of allowing the blade portion to move forward and backward with respect to the coating film portion existing in the boundary portion by adjusting an air pressure with respect to a balloon member provided to the shaft member so as to be able to expand and contract. The piping lining method according to claim 6 . Wherein the proximal end portion of the fabric member, the pipe lining method according to claim 6 annular flange portion that covers the outer portion of the tubular body part in contact is characterized that you have provided integrally. The piping lining method according to claim 8, wherein a circular elastic wire is embedded in the outer peripheral edge portion of the flange portion to maintain the shape . The elastic wire is composed of a small circle of the circular outer ring portion disposed concentrically with the center portion, characterized that you have provided radial spokes connecting state between said outer ring portion small limbal The piping lining method according to claim 9 .

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