JP6817873B2 - Piping repair method - Google Patents

Description

The present invention relates to a pipe repair method.

Conventionally, in water supply facilities and the like, various types of pipes have been used according to the application in order to distribute the fluid to the pipe system. These pipes may deteriorate over time after long-term use, or may be damaged for some reason. In such a case, necessary repairs are made as appropriate according to the purpose and type of piping.

Patent Document 1 discloses a method of coating an inflatable bag with a blended cloth of glass fiber and uncured thermoplastic fiber and repairing it by heat-pressing it on the inner surface of a pipe. There is. That is, a cloth-like pipe repair material woven with glass fiber and uncured thermoplastic fiber is covered on the outer periphery of the repair machine, and they are inserted into the pipe to inflate the repair machine bag and pipe. After the repair material is crimped to the inner surface of the pipe to be repaired, hot steam or high temperature gas is sent into the bag to heat and melt the thermoplastic fiber of the pipe repair material, and then it is cooled and solidified to repair the pipe. is there.

Japanese Patent No. 4076188

However, there are various types of pipes that require repair. Therefore, special equipment necessary for repair such as bags of inflatable repair machines and special parts for repair such as blended cloth of glass fiber and uncured thermoplastic fiber are used for the material and shape of the piping itself to be repaired. Sometimes it did not match the damaged state of the piping.
In addition, in the event of a disaster or the like, it may be difficult to obtain special materials for these repairs, special tools and special equipment necessary for repairs.

An object of the present invention is to provide a pipe repair method capable of easily repairing various types of pipes by using easily available members without using special tools or special devices.

The pipe repair method according to the aspect of the present invention includes a step of sandwiching a paper and a fluid adhesive between a first support material and a second support material so that the paper contains the adhesive, and the adhesion. It includes a step of curing an agent to obtain a sheet containing the paper, a step of removing the first support material and the second support material from the sheet, and a step of repairing a pipe using the sheet.

According to the pipe repair method, the water-absorbent paper can be easily impregnated with a fluid adhesive. At this time, since generally available paper is sufficient for the paper and generally available adhesive is sufficient for the adhesive, easily available members can be used.
Further, since the adhesive is contained in the paper by sandwiching it between the first support material and the second support material, the adhesive spreads evenly and enters the gaps between the fibers of the paper, and the adhesive is held by the fibers. Therefore, the adhesive is securely fixed. Further, since the adhesive is cured while being sandwiched between the first support material and the second support material, the sheet containing the paper has a shape along the first support material and the second support material. At this time, since it is sufficient that the first support material and the second support material can be shaped like a sheet by sandwiching the paper and the adhesive, it is not necessary to use a special tool or a special device.
Further, since the paper is thin, it has flexibility, so even if the first support material and the second support material are removed from the sheet containing the paper, the sheet still has flexibility. Therefore, the shape of the pipe can be followed, and the pipe can be easily repaired. Further, since the cured adhesive has water resistance like the resin molded product, the sheet is suitable for repairing the piping used for flowing the liquid.
Therefore, according to the pipe repair method according to the aspect of the present invention, it is possible to repair various types of pipes by using easily available members without using special tools or special devices.

In another aspect of the present invention, in the step of repairing the pipe using the sheet, the pipe may be repaired by attaching a sheet piece obtained by cutting the sheet.

According to the pipe repair method, the sheet can be cut into a shape required for repair, and a required amount of sheet can be cut and used.

In another aspect of the present invention, in the step of repairing the pipe using the sheet, a plurality of the sheets are attached so that the orientation of the paper fibers contained in the sheet is different from each other. The pipe may be repaired.

According to the pipe repair method, since the orientations of the fibers functioning as the frame material of the sheet are oriented in different directions, the strength of the repaired portion is maintained even with respect to stress from different directions.

In another aspect of the present invention, in the step of repairing the pipe using the sheet, the pipe may be repaired by stacking and pasting a plurality of the sheets.

According to the pipe repair method, a flexible sheet covers the repaired portion along the shape of the pipe, and the repaired portion can be further strengthened by further stacking and pasting the sheets.

In another aspect of the present invention, in the step of repairing the pipe using the sheet, the pipe may be repaired by attaching a plurality of sheets containing different paper properties to each other. ..

According to the pipe repair method, the properties of each sheet act complementarily by attaching a plurality of sheets containing paper having different properties. Therefore, the piping can be repaired so that it can respond to various changes in the environment.

In another aspect of the present invention, in the step of repairing the pipe using the sheet, the pipe is repaired by attaching the sheet with an adhesive of the same quality as the adhesive contained in the paper. You may.

According to the pipe repair method, since the adhesive contained in the sheet and the adhesive used to attach the sheet are of the same quality, the adhesives are well-adapted to each other, and the sheet can be reliably placed at the repaired part of the pipe. Can be glued.

In another aspect of the invention, the pipe is used to flow a liquid containing sodium hypochlorite, and the adhesive may be an adhesive resistant to sodium hypochlorite.

According to the pipe repair method, since the sheet contains an adhesive resistant to sodium hypochlorite, the pipe can be reliably repaired without being affected by the sodium hypochlorite flowing in the pipe. it can.

In another aspect of the invention, the paper may be tissue paper.

According to the pipe repair method, the tissue paper is easily available and has thinness and flexibility, so that a flexible sheet can be easily obtained by adding an adhesive.

In another aspect of the present invention, the tissue paper may have a two-ply structure.

According to the pipe repair method, the two-ply tissue paper is stronger because not only the adhesive enters the gaps between the fibers of the paper but also the adhesive is sandwiched by the unevenness of the surfaces where the two-ply tissue paper faces each other. Adhesive can be retained in.

According to the aspect of the present invention, it is possible to easily repair various types of pipes by using easily available members without using special tools or special devices.

It is a flowchart of the pipe repair method which concerns on embodiment of the aspect of this invention. It is a perspective view for demonstrating the method of making a sheet which concerns on embodiment of the aspect of this invention. It is a perspective view which shows the damaged part of the pipe which concerns on embodiment of the aspect of this invention. It is a perspective view of the state in which the sheet piece which concerns on embodiment of the embodiment of this invention is attached to the damaged part of FIG. It is sectional drawing in line AA of the pipe shown in FIG. It is a perspective view of the state in which a plurality of sheet pieces according to the embodiment of the embodiment of the present invention are attached to a damaged portion. It is a perspective view of the state in which the sheet pieces according to the embodiment of the embodiment of the present invention are overlapped and attached to the damaged portion. It is sectional drawing in BB line of the pipe shown in FIG.

Hereinafter, embodiments of the embodiment of the present invention will be described with reference to the drawings.
First, the flow of the pipe repair method of the present embodiment will be described with reference to FIG. In one embodiment, as shown in the flowchart of FIG. 1, the pipe repair method includes a paper and a fluid adhesive sandwiched between the first support material and the second support material, and the paper contains the adhesive. A step of forming the sheet (step 101), a step of curing the adhesive to obtain a sheet containing paper (step 102), a step of removing the first support material and the second support material from the sheet (step 103), and the sheet. It has a step (104) of repairing a pipe using the paper.

Next, a method of creating a sheet used for the pipe repair method of the present embodiment will be described. FIG. 3 is a perspective view for explaining a method of producing a sheet 1 according to an embodiment of the present invention.
As shown in FIG. 2, the sheet 1 according to the present embodiment is created by using the paper 2, the adhesive 3 having fluidity, and the first support material 4 and the second support material 5.

The first support member 4 and the second support member 5 are sheet-like substantially transparent members using polypropylene resin, and are rectangular members in a plan view. In one example, the first support member 4 and the second support member 5 are formed in the same shape so that they can be overlapped with each other. The first support material 4 and the second support material 5 have a surface (non-adhesive surface) that is substantially non-adhesive to the adhesive 3.

Paper 2 is a thin paper having flexibility and excellent water absorption. In one example, paper 2 is a rectangular member in plan view, which is a stretch of commonly available tissue paper with widened creases. In another example, paper 2 other than tissue paper can be applied.

In one example, paper 2 is a commonly available tissue paper with a two-ply structure. Paper 2 is formed by superimposing paper 2a and paper 2b. Paper 2a and paper 2b have a smooth surface due to facing rollers and the like in the manufacturing process of tissue paper, and a rough surface due to receiving warm air for drying in the manufacturing process. Have in. The paper 2 has a two-ply structure in which the rough surfaces of the paper 2a and the paper 2b are closely overlapped so as to face each other.

The longitudinal dimension of the first support member 4 and the second support member 5 is longer than the longitudinal dimension of the paper 2 and is close to 1.2 times the longitudinal dimension of the paper 2. Further, the dimensions of the first support member 4 and the second support member 5 in the lateral direction are sufficiently longer than the dimensions of the paper 2 in the lateral direction, and are close to three times the dimensions of the paper 2 in the lateral direction. Is. That is, the first support member 4 and the second support member 5 have a size that can surround the entire circumference of the paper 2 in a plan view.

In one example, the adhesive 3 is a fluid, substantially transparent adhesive, which is a generally available instant adhesive containing the organic compound cyanoacrylate as a main component. Due to the fluidity of commonly available instant adhesives, they spread when applied to the object to be adhered and react instantaneously with a small amount of moisture in the air. As a result, the cyanoacrylate monomer, which is a component, becomes a polymer and cures in an instant, so that the object can be instantly adhered. The mechanism by which the adhesive 3 is cured is the same as that of such an instant adhesive.

Adhesive 3 is resistant to many chemicals, like other commonly available instant adhesives based on cyanoacrylate. The adhesive 3 is particularly resistant to sodium hypochlorite, which is generally distributed in piping systems in water supply facilities.

Next, with reference to FIG. 2, a method of producing the sheet 1 by using the paper 2, the adhesive 3 having fluidity, and the first support material 4 and the second support material 5 will be described.

First, the first support member 4 is placed on a flat place such as a desk so as to be substantially horizontal. Then, the paper 2 is placed on the upper surface of the first support member 4 with the creases extended. At this time, in a plan view, the paper 2 is located substantially in the center in both the longitudinal direction and the lateral direction of the first support member 4 so that the first support member 4 surrounds the entire circumference of the paper 2. It is desirable to put it.

Then, the fluid adhesive 3 is attached to the vicinity of the center of the paper 2 placed on the upper surface of the first support member 4. Here, the amount of the adhesive 3 attached to the paper 2 is an appropriate amount so that the adhesive 3 can be contained in a portion other than the portion near the center of the paper 2. Since the adhesive 3 has fluidity, it easily spreads naturally over a wide range of paper 2, which is a tissue paper having excellent water absorption. However, in preparing the sheet 1, the adhesive 3 is placed as close to the center of the paper 2 as possible so that the paper 2 does not spread before sufficiently containing the adhesive 3 and hardens in response to moisture in the air. Attach them all together.

Then, the second support member 5 is placed substantially horizontally on the adhesive 3 that is collectively attached near the center of the paper 2, and the entire second support member 5 is evenly arranged in the direction of the arrow in FIG. Press. In this way, the adhesive 3 is extruded from the vicinity of the center of the paper 2 toward the periphery, and spreads to a portion other than the vicinity of the center of the paper 2. At this time, since the first support material 4 and the second support material 5 using polypropylene resin prevent the adhesive 3 from coming into contact with air, the adhesive 3 is instantly different from the general usage state of the instant adhesive. Does not cure.

When pressing the second support material 5, the adhesive 3 is gradually spread from the vicinity of the center of the paper 2 to the periphery through the substantially transparent second support material 5 using polypropylene resin. At this time, the first support member 4 and the second support member 5 have a size capable of surrounding the entire circumference of the paper 2 in a plan view. Therefore, even when the adhesive 3 spreads outward beyond the area where the paper 2 is placed, the adhesive 3 still prevents contact with air by the first support material 4 and the second support material 5. Is done. Therefore, there is no inconvenience that the adhesive is cured in an instant in a general instant adhesive usage state and an unexpected one is adhered.

In this way, the fluid adhesive 3 is sandwiched between the first support material 4 and the second support material 5, enters the gaps between the fibers of the paper 2, and spreads evenly. Therefore, the adhesive 3 is the paper 2. It is securely held by the fibers of. That is, the water-absorbent paper 2 can be easily impregnated with the fluid adhesive 3, and the adhesive 3 can be reliably fixed to the paper 2.

The adhesive also penetrates between the two layers of tissue paper, paper 2a and paper 2b, which are stacked so that the rough surfaces face each other. Then, since the adhesive is sandwiched by the unevenness of the rough surfaces of the two layers of tissue paper facing each other, the adhesive can be held more firmly.

Next, the adhesive 3 is cured to form the sheet 1 which is the cured adhesive 3 containing the paper 2. As described above, the adhesive 3 contained in the paper 2 is prevented from coming into contact with air by the first support material 4 and the second support material 5, so that the adhesive 3 does not cure in an instant. Therefore, in order to completely cure the adhesive 3 in a state of being sandwiched between the first support material 4 and the second support material 5, for example, while ensuring a sufficient curing time of about 2 hours, surely. The adhesive 3 is cured.

Since the adhesive 3 is cured while being sandwiched between the first support material 4 and the second support material 5 which are sheet-like members using polypropylene resin, the sheet 1 which is the adhesive 3 cured including the paper 2. Is also formed in a sheet shape along the first support member 4 and the second support member 5. In this way, the sheet 1 containing the paper 2 can be obtained by completely curing the adhesive 3 in a shape along the first support material 4 and the second support material 5.

Next, the first support material 4 and the second support material 5 are peeled off from the sheet 1 which is the adhesive 3 completely cured including the paper 2. Since the first support material 4 and the second support material 5 have a substantially non-adhesive surface with respect to the adhesive 3, the first support material 4 and the second support material 5 can be easily removed from the sheet 1. it can. Since it is sufficient for the first support material and the second support material to have a sheet-like shape with a paper and an adhesive sandwiched between them, it is not necessary to use a special tool or a special device for producing the sheet 1.

Paper 2 is tissue paper and has flexibility because it is thin. Therefore, even if the first support material and the second support material are removed from the sheet 1 which is the adhesive 3 cured by containing the paper 2, the sheet 1 is still thin and therefore has flexibility. Further, since the fibers of the paper 2 function as the frame material of the sheet 1, the fibers of the paper 2 support the cured adhesive 3 and give the sheet 1 strength. The cured adhesive 3 has water resistance similar to the resin molded product. Further, since the sheet 1 is obtained by curing the adhesive 3 containing cyanoacrylate as a main component, it has resistance to many chemicals such as chemicals containing sodium hypochlorite.

Next, a method of repairing the pipe using the sheet 1 of the present embodiment will be described with reference to FIGS. 3 to 5.
FIG. 3 is a perspective view showing a damaged portion of the pipe 6 according to the embodiment of the embodiment of the present invention. FIG. 4 is a perspective view showing a state in which the sheet piece 9 according to the embodiment of the embodiment of the present invention is attached to the damaged portion of FIG. FIG. 5 is a cross-sectional view taken along the line AA of the pipe 6 shown in FIG.

As shown in FIG. 3, the pipe 6 has a damaged portion 7 which is a hole-shaped damaged portion. In one example, the pipe 6 is a polyvinyl chloride pipe used for flowing a liquid containing sodium hypochlorite. Since sodium hypochlorite is generally distributed to piping systems in water supply facilities, it is often necessary to repair damaged parts of polyvinyl chloride pipes for flowing sodium hypochlorite.

The damaged portion 7 penetrates the pipe 6 from the outer peripheral surface 8 of the pipe 6 and leads to the internal space 6A of the pipe 6. Therefore, it is necessary to completely close the damaged portion 7 by repair so that the liquid does not leak to the outside through the damaged portion 7.

First, the sheet 1 prepared by the above method is cut out to a size capable of sufficiently covering the entire damaged portion 7, and the sheet piece 9 is prepared. As described above, the sheet 1 is thin and flexible, so that it can be easily cut into the required size and shape with generally available scissors or a cutter without using a special tool for processing. Can be done. Therefore, the sheet 1 is cut into a required shape according to the size, state, shape, and the like of the damaged portion 7, to prepare a required amount of sheet pieces 9.

As shown in FIG. 4, the sheet piece 9 has a substantially square shape in which one side can cover about one-third of the entire circumference of the outer peripheral surface 8 of the pipe 6, and the entire damaged portion 7 and the damaged portion 7 are formed. It is a size that can sufficiently cover the circumference of 7. By cutting out the required amount of the sheet piece 9 from the sheet 1 in this way, the remaining sheet 1 can be used for repairing other pipes.

Next, the sheet piece 9 is attached to the pipe 6. First, the same adhesive 3A (not shown) as the above-mentioned adhesive 3 is applied to the entire surface (first surface 9a) on the side where the sheet piece 9 faces the pipe 6. Then, the flexible sheet piece 9 is attached along the shape of the pipe 6 so that the first surface 9a faces the pipe 6 and the sheet piece 9 sufficiently covers the entire damaged portion 7. Then, by pressing the surface (second surface 9b) opposite to the first surface 9a of the sheet piece 9 inward in the radial direction along the outer peripheral surface 8 of the pipe 6, the sheet piece 9 is reliably pressed into the pipe 6. Attach to.

The adhesive 3A is different from the case of curing the adhesive 3 in which contact with air is blocked by the first support material 4 and the second support material 5 of polypropylene resin, and the adhesive 3A is air like a general instant adhesive. It cures instantly in response to the moisture inside. Therefore, while the sheet piece 9 is attached and pressed along the shape of the pipe 6, the adhesive 3A is completely cured, and the sheet piece 9 can be attached to the pipe 6.

Here, the adhesive 3 contained in the sheet piece 9 and the adhesive 3A used for attaching the sheet piece 9 are the same. Therefore, these adhesives are well-adapted to each other, and the sheet piece 9 can be reliably adhered to the repaired portion of the pipe 6. Even if the adhesive 3 and the adhesive 3A contain the same component and have different concentrations, the adhesives are more compatible with each other than using different types of adhesives.

When repairing the pipe 6, if the pipe 6 is to be repaired using the adhesive 3 without using the sheet piece 9, the damaged portion 7 is directly attached with the adhesive 3A and cured. In that case, the adhesive 3A penetrates the pipe 6 from the hole-shaped damaged portion 7 and hangs down in the internal space 6A of the pipe 6, so that the damaged portion 7 cannot be closed.

As shown in the cross-sectional view of the pipe 6 of FIG. 5, the damaged portion 7 is covered with a sheet piece 9 bonded by an adhesive 3A (not shown). After the pipe is repaired, the liquid flows through the internal space 6A of the pipe 6, and the sheet piece 9 attached so as to cover the damaged portion 7 is in direct contact with the liquid.

The damaged portion 7 penetrates the pipe 6 from the outer peripheral surface 8 of the pipe 6 and leads to the internal space 6A of the pipe 6. Therefore, it is necessary to completely close the damaged portion 7 by repair so that the liquid does not leak to the outside through the damaged portion 7. The sheet piece 9 and the cured adhesive 3A are water resistant like the resin molded product. Since the damaged portion 7 is completely closed, the polyvinyl chloride pipe 6 can be reliably repaired. The adhesive 3A has resistance to many chemicals such as chemicals containing sodium hypochlorite.

As described above, according to the pipe repair method according to the embodiment of the present invention, it is possible to repair various types of pipes by using easily available members without using special tools or special devices. ..

Next, another aspect of the pipe repair method according to the embodiment of the present invention will be described with reference to FIG. The same aspects as those of the above-mentioned piping repair method are designated by the same reference numerals and the description thereof will be omitted (the same applies to the following aspects).

FIG. 6 is a perspective view of a state in which a plurality of sheet pieces 9A according to the embodiment of the embodiment of the present invention are attached to a damaged portion. Although this aspect and the aspect of the above-described embodiment are common in the method of producing the sheet 1, they are different in the damaged state of the pipe 6 and the repair method of the pipe 6 using a plurality of sheet pieces 9A.

The pipe 6 shown in FIG. 6 has a broken portion 7A (not shown) which is a crack-shaped broken portion. The damaged portion 7A is a crack generated by applying force to the pipe 6 from various directions, penetrates the pipe 6 from the outer peripheral surface 8 of the pipe 6, and leads to the internal space 6A of the pipe 6. Further, the pipe 6 is distorted depending on the direction of the force applied to the pipe 6, and the crack-shaped damaged portion 7A is also deformed. Therefore, in order to prevent the liquid in the pipe 6 from leaking to the outside through the damaged portion 7A, the damaged portion 7A may be completely closed by repair, and a force may be applied to the pipe 6 from a different direction. However, it is necessary to repair the pipe 6 so that the damaged portion 7A is deformed and the liquid does not leak to the outside.

As shown in FIG. 6, the sheet piece 9A is a rectangle having a length in which one side in the longitudinal direction can cover about one-third of the entire circumference of the outer peripheral surface of the pipe 6, and one side in the lateral direction is longitudinal. It is about one-third of the length in the direction. As the sheet piece 9A, a total of five sheet pieces 9A1, 9A2, 9A3, 9A4, and 9A5 are prepared. At this time, the longitudinal directions of all the sheet pieces 9A are cut from the sheet 1 so as to follow the orientation of the fibers of the paper 2 contained in the sheet pieces 9A.

Next, as shown in FIG. 6, the sheet pieces 9A1 to 9A5 having five sheet pieces are attached to the pipe 6. At this time, as in the above aspect, the adhesive 3A is applied to the entire first surface 9a, and the second surface 9b is pressed inward in the radial direction along the outer peripheral surface 8 of the pipe 6.

Five sheet pieces 9A1 to 9A5 are attached to the outer peripheral surface 8 of the pipe 6 so as to form a substantially square as a whole. More specifically, first, the sheet piece 9A1 is attached in the horizontal direction along the bottom of the square (vertical direction on the paper surface; the same applies hereinafter). Next, the sheet piece 9A2 is attached in the vertical direction along the right side of the square (left-right direction on the paper surface; the same applies hereinafter). At this time, a part of the lower side of the sheet piece 9A2 is overlapped with a part of the right side of the sheet piece 9A1 and attached. Next, the sheet piece 9A3 is attached laterally along the upper side of the square. At this time, a part of the right side of the sheet piece 9A3 is overlapped with a part of the upper side of the sheet piece 9A2 and attached. Next, the sheet piece 9A4 is attached in the vertical direction along the left side of the square. At this time, a part of the upper side of the sheet piece 9A4 is overlapped with a part of the left side of the sheet piece 9A3 and a part of the lower side of the sheet piece 9A4 is overlapped with a part of the left side of the sheet piece 9A1. Next, the sheet piece 9A5 is attached laterally to the substantially center of the square in the vertical direction. At this time, a part of the right side of the sheet piece 9A5 is overlapped with a part of the center of the sheet piece 9A2 in the longitudinal direction, and a part of the left side of the sheet piece 9A5 is overlapped with a part of the center of the sheet piece 9A4 in the longitudinal direction. Paste.

That is, the five sheet pieces 9A1 to 9A5 having the same fiber orientation of the paper 2 are alternately attached in the left-right direction of the paper surface and the vertical direction of the paper surface so that the orientation of the paper fibers faces different directions. It is affixed to. Further, five sheet pieces 9A are attached by superimposing a part of each on a part of another sheet piece 9A.

Therefore, it functions as a frame material for holding the adhesive 3 of the sheet piece 9A, and the orientations of the fibers that give strength to the sheet 1 are oriented in different directions, so that the strength of the repaired portion is increased even with respect to stress from different directions. Be kept. Therefore, even if a force in a different direction is applied to the pipe 6, the pipe 6 is less likely to be distorted, and the pipe 6 can be repaired so that the crack-shaped damaged portion 7A is deformed and the liquid does not leak to the outside. Further, by using the flexible sheet piece 9A, the damaged portion 7A is covered along the shape of the pipe 6, and by further laminating the sheet piece 9A, the repaired portion can be further strengthened. it can.

Next, another aspect of the pipe repair method according to the embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view of a state in which the sheet pieces 9B according to the embodiment of this embodiment are overlapped and attached to the damaged portion. FIG. 8 is a cross-sectional view taken along the line BB of the pipe shown in FIG.

The sheet piece 9B according to the embodiment of the embodiment of the present invention is further attached to the pipe 6 shown in FIG. 7 so as to surround the outer peripheral surface 8 of the pipe 6 to which the sheet piece 9 shown in FIG. 4 is attached. ing. That is, in this aspect, in addition to the method of repairing the pipe 6 in the aspects shown in FIGS. 2 to 5, a sheet 1A using Japanese paper instead of tissue paper is further prepared as the paper 2A. Then, this is a repair method in which the sheet piece 9B created by cutting out the sheet 1A is further overlapped and attached to the sheet piece 9.

The method of creating the sheet 1A will be described below.
In preparing the sheet 1A according to the present embodiment, the adhesive 3 having fluidity, the first support material 4 and the second support material 5 are used, except that Japanese paper is used as the paper 2A instead of the tissue paper. Is used in common with the sheet 1 shown in FIG.

Paper 2A is a Japanese paper having a certain degree of flexibility and excellent water absorption, though not as much as Tish paper. Furthermore, Japanese paper is formed by entwining long plant fibers, so it has high strength that tissue paper does not have. That is, the properties of the paper 2 contained in the sheet 1 and the properties of the paper 2A contained in the sheet 1A are different from each other.

Paper 2A is a rectangular member in a plan view, and is a generally available crease of Japanese paper. Since the dimensions of the paper 2A are the same as those of the paper 2, the first support member 4 and the second support member 5 can surround the entire circumference of the paper 2 in a plan view.

The method of making the sheet 1A using the paper 2A, the fluid adhesive 3, and the first support material 4 and the second support material 5 is the same procedure as the method of making the sheet 1. Therefore, the description is omitted. Since paper 2A, which is Japanese paper, has a certain degree of flexibility and high strength, sheet 1A, which is an adhesive 3 cured by containing paper 2A, also has a certain degree of flexibility and high strength.

Then, the sheet 1 prepared as described above is cut into a necessary shape to prepare a required amount of sheet pieces 9B. The dimension of the sheet piece 9B in the longitudinal direction is such that the entire circumference of the outer peripheral surface 8 of the pipe 6 can be sufficiently covered, and the dimension in the lateral direction is sufficiently longer than one side of the sheet piece 9. Therefore, the sheet piece 9B has a size that can cover the entire sheet piece 9 and the entire circumference of the outer peripheral surface 8 of the pipe 6.

As described above, the sheet 1A has a certain degree of flexibility, so that it can be easily cut into the required size and shape with generally available scissors or a cutter without using a special tool for processing. Can be done. Therefore, by cutting the sheet 1A into a required shape, a required amount of sheet pieces 9B is produced. By cutting out the required amount of the sheet piece 9B from the sheet 1A in this way, the remaining sheet 1A can be used for repairing other pipes.

Here, the method of repairing the pipe 6 using the sheet pieces 9 shown in FIGS. 3 to 5 is common to the embodiment of the present embodiment and is not repeated here.
Next, as shown in FIG. 7, the sheet piece 9B is overlapped and attached to the pipe 6 to which the sheet piece 9 is attached. At this time, the adhesive 3A is applied to the entire first surface 9a of the sheet piece 9B in the same manner as described above. Then, the second surface 9b of the sheet piece 9B is attached to the outer peripheral surface 8 of the pipe 6 so as to cover the entire sheet piece 9 that has already been attached. At this time, since the sheet piece 9B has a length in the longitudinal direction that can sufficiently cover the entire circumference of the outer peripheral surface 8 of the pipe 6, all the sheet pieces 9B are wound around the pipe 6 in order. Stick it around. The sheet piece 9B made of Japanese paper is not as flexible as the sheet piece 9 made of tissue paper, but it has a certain degree of flexibility, so that it can be attached by being wrapped around the pipe 6 in this way. is there.

Then, the second surface 9b of the sheet piece 9B is pressed inward in the radial direction along the outer peripheral surface 8 of the pipe 6. At this time, since the sheet piece 9B is attached to the entire circumference of the pipe 6, for example, when pressing by hand, the pipe 6 is gripped so as to be wrapped by the palm, and the second surface of the sheet piece 9B is radially inward. By rotating the pipe 6 about the axis while pressing the 9b, the sheet piece 9B can be reliably attached over the entire circumference of the pipe 6.
Then, in the same manner as described above, the adhesive 3A is completely cured, and the sheet piece 9B is completely attached to the pipe 6.

FIG. 8 is a cross-sectional view taken along the line BB of the pipe 6 shown in FIG. Here, the line BB in FIG. 7 and the line AA in FIG. 4 indicate the same location in the pipe 6.
As shown in the cross-sectional view of the pipe 6 of FIG. 8, the damaged portion 7 is covered with a sheet piece 9 bonded by an adhesive 3A (not shown). Then, the pipe 6 is further laminated with a sheet piece 9B adhered so as to cover the entire circumference with an adhesive 3A (not shown).

By covering the entire circumference of the pipe 6 with the sheet piece 9B in this way, even if the pressure inside the pipe 6A increases, the pipe 6 is unlikely to expand outward in the circumferential direction. Further, the sheet piece 9 using flexible tissue paper covers the repaired part along the shape of the pipe, and the sheet piece 9B is further attached to the repaired part to give the repaired part more strength. .. Here, as the sheet piece 9B to be laminated and attached to the sheet piece 9, Japanese paper having a higher strength than the sheet piece 9 is used. Therefore, it is possible to give high strength to the repaired portion by stacking the sheet pieces 9B made of Japanese paper rather than stacking the sheet pieces 9 made of tissue paper.

Further, in the embodiment of this embodiment, taking advantage of the property of the tissue paper having flexibility on the one hand, the flexible sheet piece 9 covers the repaired portion along the shape of the pipe 6, and on the other hand, the tissue paper is used. Taking advantage of the properties of Japanese paper with high strength, the sheet piece 9B with high strength gives the repaired part more strength.
In this way, by repairing the pipe 6 by sticking a plurality of sheets having different paper properties contained in the sheets, the properties of the sheets act complementarily. Therefore, by changing the combination of the properties of the paper contained in the sheet, the pipe 6 can be repaired so as to be able to cope with various changes in the environment.

As described above, in the pipe repair method according to the embodiment of the present embodiment, the paper 2 and the fluid adhesive 3 are sandwiched between the first support material 4 and the second support material 5 and adhered to the paper 2. Using the sheet 1, a step of including the agent 3, a step of curing the adhesive 3 to obtain a sheet 1 containing the paper 2, a step of removing the first support material 4 and the second support material from the sheet 1, and a step of removing the first support material 4 and the second support material from the sheet 1. It has a process of repairing piping.

At this time, since the generally available paper is sufficient for the paper 2 and the generally available adhesive is sufficient for the adhesive 3, an easily available member can be used. Further, since it is sufficient that the first support material 4 and the second support material 5 can be shaped like a sheet by sandwiching the paper 2 and the adhesive 3, it is not necessary to use a special tool or a special device. Further, since the sheet 1 has flexibility, it can conform to the shape of the pipe 6 and can repair various types of pipes.

Further, in the pipe repair method according to the aspect of the present invention, in the step of repairing the pipe 6, the pipe 6 is repaired by attaching the sheet piece 9 obtained by cutting the sheet 1. Therefore, the sheet 1 can be cut into a shape required for repair, and the required amount of sheet pieces 9 can be cut and used.

Further, in the pipe repair method according to the aspect of the present invention, in the step of repairing the pipe 6, a plurality of sheet pieces 9 are attached so that the fibers of the paper 2 contained in the sheet piece 9 are oriented in different directions. Repair the pipe 6. Therefore, since the orientations of the fibers functioning as the frame material of the sheet are oriented in different directions, the strength of the repaired portion is maintained even with respect to stress from different directions.

Further, in the pipe repair method according to the aspect of the present invention, in the step of repairing the pipe 6, the pipe 6 is repaired by stacking and pasting a plurality of sheet pieces 9. Therefore, the repaired portion can be further strengthened by covering the repaired portion along the shape of the pipe 6 with the flexible sheet piece 9 and further laminating and attaching the sheet piece 9B.

Further, in the pipe repair method according to the aspect of the present invention, in the step of repairing the pipe 6, the pipe 6 is repaired by sticking a plurality of sheet pieces having different paper properties contained in the sheet. Therefore, by attaching a plurality of sheets containing papers having different properties, the properties of each sheet act complementarily. Therefore, the pipe 6 can be repaired so as to be able to cope with various changes in the environment.

In the pipe repair method of the aspect of the present invention, in the step of repairing the pipe 6, the pipe 6 is repaired by sticking the sheet piece 9 with the adhesive 3A of the same quality as the adhesive 3 contained in the paper 2. Therefore, since the adhesive 3 contained in the sheet piece 9 and the adhesive 3A used for attaching the sheet piece 9 are of the same quality, the adhesives are well-adapted to each other and the sheet piece 9 is surely attached to the pipe 6. Can be glued to the repaired area.

In the pipe repair method according to the embodiment of the present invention, the pipe 6 is used for flowing a liquid containing sodium hypochlorite, and the adhesive 3 is an adhesive having resistance to sodium hypochlorite. Therefore, since the sheet piece 9 contains the adhesive 3 having resistance to sodium hypochlorite, the pipe 6 can be reliably repaired without being affected by the sodium hypochlorite flowing in the pipe.

In the pipe repair method of the aspect of the present invention, the paper 2 is tissue paper. Therefore, since the tissue paper is easily available and has thin flexibility, the flexible sheet 1 can be easily obtained by including the adhesive 3.

In the pipe repair method according to the embodiment of the present invention, the tissue paper has a two-ply structure. In the double-layered tissue paper, not only the adhesive 3 enters the gap between the fibers of the paper 2, but also the adhesive 3 is sandwiched by the unevenness of the surfaces of the two-layered tissue paper facing each other, so that the adhesive 3 is more firmly applied. Can be retained.

Although the aspects of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention.

1 Sheet 1A Sheet 2 Paper 2A Paper 3 Adhesive 3A Adhesive 4 1st support 5 2nd support 6 Piping 7 Damaged part 7A Damaged part 8 Outer peripheral surface 9 Sheet piece 9A Sheet piece 9A1 Sheet piece 9A2 Sheet piece 9A3 Sheet piece 9A4 Sheet piece 9A5 Sheet piece 9B Sheet piece

Claims (9)

A step of sandwiching the paper and a fluid adhesive between the first support material and the second support material and impregnating the paper with the adhesive.
A step of curing the adhesive to obtain a sheet containing the paper, and
A step of removing the first support material and the second support material from the sheet, and
The process of repairing piping using the sheet and
Plumbing repair method with. The pipe repair method according to claim 1, wherein in the step of repairing the pipe using the sheet, the pipe is repaired by attaching a sheet piece obtained by cutting the sheet. 1. In the step of repairing the pipe using the sheet, the pipe is repaired by attaching a plurality of the sheets so that the orientations of the paper fibers contained in the sheet are oriented in different directions. Alternatively, the piping repair method according to 2. The pipe repair method according to any one of claims 1 to 3, wherein in the step of repairing the pipe using the sheet, the pipe is repaired by stacking and pasting a plurality of the sheets. The pipe repair method according to claim 3 or 4, wherein in the step of repairing the pipe using the sheet, the pipe is repaired by attaching a plurality of sheets containing different paper properties to each other. .. The pipe according to claim 1, wherein in the step of repairing the pipe using the sheet, the pipe is repaired by attaching the sheet with an adhesive of the same quality as the adhesive contained in the paper. Repair method. The pipe is used to flow a liquid containing sodium hypochlorite.
The pipe repair method according to any one of claims 1 to 6, wherein the adhesive is an adhesive having resistance to sodium hypochlorite. The pipe repair method according to any one of claims 1 to 7, wherein the paper is tissue paper. The pipe repair method according to claim 8, wherein the tissue paper has a two-ply structure.

Images