TW201341699A - Method of making pipeline lining and pipeline lining material - Google Patents

Abstract

This invention aims to inhibit and reduce the gap between a lining material and an inside surface of a pipeline at a curvature portion of the pipeline. A sheet-like lining material (1) is made as a cylinder, and the lining material (1) is disposed in the pipeline (P) in a condition that the two ends in the circumferential direction are set in an overlapped state in the circumferential direction. Under such a condition, the curvature portion (P3) of the pipeline (P) is provided with the lining material (1) in such a way that the overlapped portion (1a) of the two ends in the circumferential direction of the lining material (1) is set toward the outer side of the curvature portion (P3). After that, the lining material (1) disposed in the pipeline (P) is allowed to expand in diameter when the two ends in the circumferential direction slide circumferentially. Therefore, at the curvature portion (P3), the portion of the lining material (1) facing the outer side of the curvature can be expanded easily, and the gap between the lining material (1) and the inside surface of the curvature portion (P3) is reduced.

Description

Pipe lining application method and pipeline lining

The invention relates to a lining application method of a pipeline and an inner lining material of the pipeline.

In the past, as a construction method for repairing old pipes or water pipes for agricultural use, or pipes for gas pipes, etc., the following construction methods are known. In other words, a cylindrical inner lining material containing a curable resin liquid and reinforcing fibers is provided on the inner surface of the existing pipe, and the curable resin liquid is cured to construct a fiber reinforced resin in the pipe. A solid lining construction.

Among them, Patent Document 1 also discloses the following construction method. First, a high-strength fiber of short fibers is dispersed in a sheet-like lining material (Set Molding Compound: SMC) of a thermosetting resin liquid, and the both ends are slidably overlapped. Inside the pipeline. Then, the pressure fluid is supplied, and the internal pressure is applied to the cylindrical inner lining material, and the both end portions thereof are slid to be expanded, and the inner lining material is adhered to the inner surface of the pipe. Further, a heat medium such as steam is supplied to the inner side of the inner lining material to cure the thermosetting resin liquid contained in the inner lining material.

Patent Document 1: Japanese Patent Laid-Open No. Hei 5-278177

In the repairing method of Patent Document 1, the inner lining material is not in close contact with If there is a gap between the inner surface of the inner liner and the inner surface of the pipeline, the amount of the inner surface of the pipeline will reduce the substantial sectional area of the repaired pipeline. For this reason, if the cylindrical inner lining material is placed in the pipe and then expanded, the inner lining material is expected to adhere to the inner surface of the pipe as much as possible. However, as shown in Fig. 15, in the case where the repaired object has the pipe of the curved portion P3 in the middle, the circumferential portion of the curved outer portion becomes longer than the curved inner portion in the curved portion P3. Therefore, when the inner lining material 100 is expanded in the pipe diameter, it is difficult to closely contact the inner lining material 100 to the inner surface of the curved outer side of the curved portion P3, and it is easy to occur between the inner lining material 100 and the curved portion P3. Void.

It is an object of the present invention to reduce the gap between the inner lining material of the curved portion of the pipe and the inner surface of the pipe as small as possible.

A lining application method for a pipeline according to a first aspect of the invention is a method for lining a pipeline having a curved portion, comprising: an installation step and a diameter expansion step; and the installation step is a sheet-like method The inner lining material is rounded in a tubular shape, and the inner lining material is placed in the duct in a state in which both end portions in the circumferential direction are overlapped in the circumferential direction; and the diameter expanding step is provided in the duct The inner lining material is expanded in diameter while sliding both end portions in the circumferential direction in the circumferential direction. In the installation step, the curved portion of the duct is such that the circumferential direction of the inner lining material is two The inner lining material is provided so that the overlapping portion of the end portion faces the curved outer side of the curved portion.

According to the invention, in the installation step, the inner lining material is provided so that the overlapping portion of the circumferential end portions of the inner lining material faces the curved outer side of the curved portion in the curved portion of the pipe. Therefore, in the subsequent diameter expansion process, when the inner lining material is expanded, the both end portions of the inner lining material in the circumferential direction are directed toward the curved portion. The outer side of the curved state slides in the circumferential direction, whereby the curved outer side portion facing the inner lining material is easily swelled. Therefore, the gap between the inner surface of the curved portion and the inner lining material becomes small, so that the inner lining material becomes easy to follow the inner surface of the curved portion.

According to a second aspect of the invention, in the first aspect of the invention, the inner lining material is a textile comprising a glass fiber, and is characterized by the lining.

The inner lining material is used to repair or enhance the old-aged pipeline. Therefore, it is required to have a certain strength. However, in order to ensure the strength, if the thickness of the inner lining material is increased, the substantial sectional area of the pipeline will be Become smaller. In this regard, the inner lining material of the present invention is intended to contain a woven fabric composed of glass fibers, so that the strength is increased. Therefore, the thickness of the lining material can be changed to be thin.

Further, the woven fabric composed of the above glass fibers may be a glass roving cloth (the invention of the third item). In this case, the strength of the inner lining material will be stronger.

According to a fourth aspect of the invention, in the lining of the second aspect of the invention, the lining material has a nonwoven fabric in which an organic fiber is laminated on the textile composed of the glass fiber. After the object, the structure joined by the needle punch is characterized. .

In the installation step, when the inner lining material is inserted into the pipe, or in the subsequent diameter expansion process, both ends of the inner lining material are slid in the circumferential direction, and the diameter is increased, etc., if there is a large When an external force acts on a part of the inner lining material, the textile is composed of glass fibers, and the fiber is displaced (the woven eyelet shift). At this time, at the position where the woven eyelet is displaced, The strength of the inner lining material is locally lowered.

In this regard, the inner lining material of the present invention has a structure in which a woven fabric composed of a non-woven fabric and glass fibers having overlapping organic fibers is joined by a needle punching method. The non-woven fabric has a structure in which long fibers are entangled, and when an external force acts on the woven fabric composed of the glass fibers, the non-woven fabric joined by the needle punching method overlapping the woven fabric has resistance to the composition. Fiberglass for textiles. Therefore, the weaving of the woven fabric of the textile composed of the glass fibers is suppressed. Further, with the non-woven fabric, it is possible to prevent the glass fiber from being opened at the end of the woven fabric. Thereby, a high-strength lining structure can be uniformly formed on the inner side of the pipe.

According to a fourth aspect of the invention, in the fourth aspect of the invention, in the fourth aspect of the invention, the nonwoven fabric is superposed on both sides of the textile composed of the glass fibers.

In the present invention, since the two layers of the nonwoven fabric are used to sandwich the structure of the textile composed of the glass fibers, the weaving of the woven fabric is inhibited from being shifted or opened.

According to a sixth aspect of the invention, in the lining of the first aspect of the invention, the lining material is impregnated with the thermosetting resin liquid, and in the expanding step When the inner lining material is heated while being heated, the outer lining material is heated and the outer lining material is mutually slid while the outer lining material is expanded to the extent that the thermosetting resin liquid is hardened. .

In the present invention, in the diameter expansion step, the inner lining material is heated while being pressed from the inner side to expand the inner lining material, and the fruit is immersed therein. The thermosetting resin liquid of the lining material is hardened. Thereby, a strong lining structure can be constructed inside the pipe.

According to a sixth aspect of the invention, in the sixth aspect of the invention, in the sixth aspect of the invention, the both ends of the inner lining material are rounded and formed in a state of being overlapped by heat fusion. In the above-described diameter expansion step, the inner liner is heated while being heated from the inside to release the joining of the circumferential end portions formed by the hot-melt adhesive.

In the present invention, both ends of the inner lining material in the circumferential direction are temporarily joined by the hot-melt adhesive, so that in the setting process, the inner lining material can be prevented from being displaced at the both ends when the inner lining material is inserted into the pipe. And the situation in which the inner lining material is enlarged. Further, after being placed in the piping, when the inner lining material is heated and pressurized, the hot-melt adhesive softens and the joining force is lowered. Thereby, both ends in the circumferential direction are slid, the inner lining material is expanded in diameter, and the thermosetting resin is cured in a state of being in close contact with the inner surface of the pipe.

The lining material for a pipe according to the eighth aspect of the invention is characterized in that it has a structure in which a nonwoven fabric composed of an organic fiber and a woven fabric composed of glass fibers are overlapped by a needle punching method, and is rounded into a cylindrical shape, and the circumference thereof is rounded. In a state where both end portions of the direction are overlapped, they are joined by a hot melt adhesive.

According to the present invention, since the woven fabric composed of the glass fibers is contained, the strength of the lining material is strongly changed, and the thickness of the lining material can be made thin. In addition, a non-woven fabric is superposed on a textile composed of glass fibers and joined by a needle punching method. Therefore, even if an external force acts on the inner lining material during the installation or expansion of the pipe, Can prevent fiberglass The perforation is offset. Further, since both ends of the inner lining material in the circumferential direction are temporarily joined by the hot-melt adhesive, it is possible to prevent the both end portions from being displaced when the inner lining material is inserted into the pipe in the installation step. The situation in which the inner lining material is enlarged. Further, after being placed in the piping, when the inner lining material is pressurized from the inner side in a heated state, the hot-melt adhesive lowers the joining force. Therefore, the temporary engagement of both ends is released and slidable, and the inner lining material expands and adheres to the inner surface of the piping.

Further, when the inner lining of the pipe having the bent portion is applied, the inner lining material of the present invention is provided with an inner lining so that the overlapping portion of the circumferential end portions faces the curved outer side of the curved portion. Thereby, in the curved portion, the gap occurring between the inner surface of the pipe and the inner lining material can be suppressed to be small.

Hereinafter, embodiments of the present invention will be described. Fig. 1 is a perspective view of an inner lining material according to the embodiment. For example, the inner lining material 1 of the present embodiment is used for repairing an existing pipe for agricultural water, etc., and the inner lining material 1 is inserted into the existing pipe, and is expanded to be intimately connected. Set in the state of the inner surface of the pipeline.

First, the configuration of the inner lining material 1 will be described. Fig. 2 is a perspective view of the inner lining material before being rounded into a cylindrical shape. Figure 3 is a cross-sectional view of the inner lining material. As shown in Fig. 2, the inner lining material 1 is a sheet-like member and is used in a state of being rounded into a cylindrical shape. Further, as shown in Fig. 1, the inner lining material 1 which is rounded into a cylindrical shape is inserted into the tubular textile fabric 2.

As shown in Fig. 3, the sheet-like lining material 1 is a non-woven fabric 4 (for example, a spun-bonded non-woven fabric) in which organic fibers such as polyester are alternately superposed, and A glass roving cloth 5 woven by a high-strength glass roving, the plurality of layers being joined by a needle punching method. Further, the nonwoven fabric 4 is superposed on both surfaces of the glass roving cloth 5, and the glass roving cloth 5 is sandwiched by the nonwoven fabric 4. As described above, since the lining material 1 of the present embodiment has a woven fabric composed of glass fibers, the strength is strongly changed, and the thickness of the lining material 1 can be made thin. Further, in particular, the textile composed of glass fibers is a glass roving cloth, so that the strength of the inner lining material 1 becomes stronger.

Further, both end portions in the circumferential direction of the inner lining material 1 which is rounded into a cylindrical shape are joined by the hot-melt adhesive 6 in a state of being overlapped. Fig. 4 is a view showing an enlarged view of an overlapping portion of both end portions of the inner lining material in the circumferential direction of Fig. 1 . As shown in Fig. 4, the hot-melt adhesive 6 is not applied to the entire surface of the end portion of the lining material 1, but is plurally divided into two in the longitudinal direction of the cylinder (two in the fourth drawing). The elongated area is locally coated. In this manner, the other end portion is overlapped with the application surface of the adhesive 6 at one end portion of the inner lining material 1, so that both end portions of the inner lining material 1 are joined. In the following, the overlapping portion between the both end portions of the inner lining material 1 in the circumferential direction is referred to as "overlapping portion 1a".

Further, the joining of the both end portions of the inner lining material 1 is such that the end portion is not displaced when the inner lining material 1 is reversed in the pipe P and is temporarily fixed. The joint strength is sufficient. So, in the future Incidentally, the hot-melt adhesive 6 is softened by the heating of the diameter-expanding step after the lining material 1 is placed in the pipe P, and the joining of the both end portions is released.

For example, the tubular textile 2 shown in Fig. 1 is woven with polyester. The outer surface of the tubular textile 2 is covered with a protective film 3 of a thermoplastic resin such as polyethylene, polypropylene, nylon or polyester, and the tubular textile 2 is airtight. On the inner side of the tubular textile 2, the inner lining material 1 which is rounded into a cylindrical shape is inserted, so that the outer surface of the inner lining material 1 can be covered by the tubular woven fabric 2.

For example, the inner lining material 1 described above is manufactured as follows. First, a woven jersey machine is used to woven a glass roving as a glass roving cloth 5. Then, the glass roving cloth 5 and the non-woven fabric 4 are alternately laminated and joined by a needle punching method, and cut into a predetermined width to form a sheet-like inner lining material 1. Thereafter, the sheet-like lining material 1 is rounded into a cylindrical shape, and the other end portion is reset after the hot-melt adhesive 6 is applied to the surface of one end portion in the circumferential direction, and both end portions are joined. After the cylindrical lining material 1 produced in this manner is pulled into the tubular woven fabric 2, the entire lining material 1 and the tubular woven fabric 2 are immersed in the thermosetting resin liquid.

Further, as a method of impregnating the resin liquid, a general method of pressing the inner liner 1 into which the thermosetting resin liquid is injected by a nip roller may be used, but the resin may be more uniformly impregnated. From the viewpoint of the inner lining material 1, the following method is preferred. That is, a resin liquid having a viscosity lower than that of a general user (a viscosity which will fall down at a normal temperature) is used, and the lining material 1 after the resin liquid is injected is transported to a high position, and the weight can be heavy. The resin liquid can be uniformly immersed in the lining material 1 in a state where the excess resin liquid adhering to the inner lining material 1 is dropped. Further, the resin impregnation process is simpler than the case where the lining material 1 is rolled by using a roll. Further, when the lining material 1 is transported after the resin is immersed, there is a possibility that the resin liquid having a low viscosity may fall, and thus the viscosity treatment (for example, heating or the like) may be performed in response to the kind of the resin liquid. Cooling, etc., is preferably carried out while increasing the viscosity of the resin.

Hereinafter, a method of repairing the installed line P using the above-described inner lining material 1 will be described. Fig. 5 is a cross-sectional view showing a curved portion of a pipe to be repaired. As shown in Fig. 5, the pipe P to be repaired in the present embodiment is a pipe in which the two straight pipes 10 and 11 are connected by a bent pipe 12 (90° elbow in Fig. 5). That is, a pipe having a bent portion P3 between the two straight pipe portions P1, P2.

When the lining material 1 is used to repair the pipe P, first, the lining material 1 which is rounded into a cylindrical shape is placed in the pipe P to be repaired (setting step). Then, the inner lining material 1 provided in the pipe P is expanded in diameter in the circumferential direction while sliding both ends in the circumferential direction (expansion diameter step). In the above-described diameter expansion step, the inner lining material 1 is heated while being pressurized from the inside, and the thermosetting resin liquid immersed in the inner lining material 1 is simultaneously hardened while the inner lining material 1 is expanded. .

(setting process)

First, the setting process will be described. Figure 6 is a longitudinal sectional view of a pipe in which the lining material is disposed. Figure 7 is a view from the front of the direction of the setting The pattern of the front end portion of the reverse inner lining material on the way. As shown in Fig. 6 and Fig. 7, in the present embodiment, the cylindrical inner lining material 1 impregnated with the thermosetting resin liquid is provided in a state in which the fluid pressure is applied and the inner and outer surfaces thereof are reversed. In the pipeline P (reverse construction method). More specifically, in the state in which the one end portion of the long-side lining material 1 of the reel (not shown) is turned over, the inlet of the pipe P is integrated. Here, the inner side of the turned-over portion is covered with the airtight protective film 3. Thereafter, the turned-over portion is covered with the pressure of the fluid such as pressurized air by the surface of the protective film 3. Thus, by the action of the fluid pressure, as indicated by the bold arrow symbol in Fig. 6, the reverse front end portion 1b of the inner lining material 1 enters and exits along the pipe P toward the front, and accordingly, the inner lining material 1 is pulled out from the reel. Thereby, the reverse rotation of the inner lining material 1 is continuously performed so that the full length thereof reverses the front and back. Further, in the reverse construction method, the reverse end portion 1b of the inner lining material 1 is caused to flow along the pipe P by the action of the fluid pressure, and thus even the pipe P having the curved portion P3 is used. It is easier to set the inner lining material 1. Further, as described above, both end portions of the inner lining material 1 in the circumferential direction are joined (temporarily joined) by the hot-melt adhesive 6, so that when the inner and outer surfaces of the inner lining material 1 are reversed, it can be prevented. The case where the offset at both ends in the circumferential direction is enlarged again.

Fig. 8 is a cross-sectional view showing a curved portion of the pipe after the installation process. Fig. 9 is a sectional view taken along line IX-IX of Fig. 8. Fig. 10 is an enlarged view showing an overlapping portion of the inner lining surrounded by the ellipse A of Fig. 9. As shown in Fig. 9, when the inner lining material 1 formed by the above-described reverse construction method is completed, the inner and outer positions of the inner lining material 1 and the tubular woven fabric 2 are reversed to become the inner lining material 1. The inner surface is covered by the tubular textile 2 .

Here, in the installation step, in the curved portion P3, the overlapping portion 1a of the circumferential end portions of the inner lining material 1 is disposed so as to face the curved outer side of the curved portion P3. Lining material 1. Specifically, before the lining material 1 is placed in the pipe P by the above-described reverse construction method, the overlapping portion 1a of the lining material 1 is directed toward the side of the pipe P (in the curved portion P3). Become the direction of the outside of the bend). As shown in Fig. 9, in this state, the inner lining material 1 is reversed so that the overlapping portion 1a of the inner lining material 1 faces the inner surface on the outer side of the curved portion of the curved portion P3. In addition, before the repair of the line P, a television camera is inserted into the line P to perform an operation to investigate the state of the inner surface. However, in this case, the bending portion of the pipe P can be confirmed by the television camera. The direction of the curved outer side of P3.

(expansion process)

Hereinafter, the step of expanding the diameter will be described. Fig. 11 is a cross-sectional view showing a curved portion of the pipe after the diameter expansion process. Fig. 12 is a sectional view taken along line XII-XII of Fig. 11. Fig. 13 is an enlarged view of the overlapping portion of the inner lining surrounded by the ellipse B of Fig. 12.

In the diameter expansion process, the lining material 1 provided in the pipe P is heated to a curing temperature (for example, 80 to 100 ° C) of the thermosetting resin liquid, and the lining material 1 is pressurized from the inside. . Thereby, the thermosetting resin liquid is hardened while expanding the inner lining material 1. Thus, the method of applying pressure from the inside while heating the lining material 1 is not limited to a specific method, but for example, as shown below, using a heating medium, simultaneously The method of expanding the diameter of the inner liner 1 and hardening the thermosetting resin liquid is simple.

After the installation process (after the reverse rotation), the tubular textile 2 is disposed inside the lining material 1, and the inner surface of the tubular textile 2 is a gas-tight protective film 3. The status covered. Therefore, in the tubular textile fabric 2, a heating medium such as heated air or steam is supplied, and the inner lining material 1 can be heated while being pressurized from the inner side.

In the diameter expansion step, the lining material 1 is heated to a curing temperature (for example, 80 to 100 ° C) of the thermosetting resin. At this time, the hot-melt adhesive 6 which temporarily engages both end portions of the inner lining material 1 in the circumferential direction is softened, and the joining force is lowered, so that the circumferential end portions of the inner lining material 1 can be circumferentially oriented. Sliding on the ground. Further, the type of the hot-melt adhesive 6 may be appropriately selected in accordance with the curing temperature of the thermosetting resin liquid. When the inner lining material 1 is pressed from the inside while the heating is performed, the both end portions of the inner lining material 1 in the circumferential direction can be slid in the circumferential direction to expand the inner lining material 1. Thereby, the inner lining material 1 is pushed to the inner surface of the pipe P and is in close contact with each other, and in this state, the thermosetting resin is thermally hardened. Therefore, on the inner surface of the pipe P, the thermosetting resin is constructed by a high-strength glass roving cloth 5 to form a reinforced and strong lining structure.

However, as shown in Fig. 9, in the previous installation step, the overlapping portion 1a of the both end portions of the inner lining material 1 in the circumferential direction is bent outward of the curved portion P3 at the curved portion P3 of the pipe P. The way, the setting has the inner lining 1. Therefore, in the diameter expansion step, when the inner lining material 1 is expanded in diameter, the overlapping portion 1a of both end portions of the inner lining material 1 in the circumferential direction is curved toward the direction. In a state in which the portion P3 is bent outside, the both end portions are slid in the circumferential direction, whereby the portion facing the outside of the curve is easily inflated toward the outside. Therefore, as shown in Fig. 11 and Fig. 12, in the curved portion P3, the gap between the inner lining material 1 and the inner surface of the pipe P becomes small, and in the curved portion P3, the inner lining material 1 is also It becomes easy to follow the inner surface of the pipe P all the way. Further, in the curved portion P3 of the pipe line P, the both ends of the inner lining material 1 in the circumferential direction are largely slid, and are swollen toward the outside. Therefore, in the curved portion P3, the amount of sliding at both end portions in the circumferential direction is larger than that of the straight pipe portions P1 and P3 of the pipe P. In other words, the amount of overlap of the overlapping portion 1a of the inner lining material 1 in the curved portion P3 becomes smaller as compared with the straight pipe portions P1, P3.

Further, as the curvature of the curved portion P3 is increased (the radius of curvature is small), the difference in the circumferential length between the inner circumference and the outer circumference of the curved portion P3 becomes larger, so that the inner lining material 1 and the curved portion P3 are formed. A gap is likely to occur between the inner faces of the curved outer portions. Therefore, when the curvature of the bending of the curved portion P3 is large as described above, the present invention can be formed by forming the lining material 1 toward the outside of the curved portion P3, which is particularly effective.

Further, in the present embodiment, in the above-described installation step, since the reverse construction method is employed, when the inner and outer surfaces of the inner lining material 1 are reversed, a large tensile force is likely to act on the inner lining material 1. In the diameter expansion step, when both ends of the inner lining material 1 are slid in the circumferential direction, and the inner lining material 1 is expanded in diameter, the large frictional force is likely to act on the both end portions. As described above, when a large external force acts on a part of the inner lining material 1, the woven roving cloth 5 is likely to be eccentrically displaced. However, in the lining material 1 of the present embodiment, the nonwoven fabric 4 is superposed on the glass roving cloth 5 and joined by a needle punching method. Also, non-woven fabric 4 is the cause The structure has a structure in which the long fibers are entangled. Therefore, when an external force acts on the glass roving cloth 5, the glass fiber constituting the glass roving cloth 5 is imparted with resistance by the non-woven fabric 4 joined to the glass roving cloth 5 to make the glass The offset of the fibers is suppressed, that is, the woven eyelet offset of the glass roving cloth 5 is suppressed.

Further, when the lining material 1 is manufactured, when a plurality of glass rovings 5 are cut out from a large glass roving cloth, the fibers are easily opened at the cut ends of the glass rovings 5. line. However, in the present embodiment, by the fact that the nonwoven fabric 4 is superposed on the glass roving cloth 5, the opening of the end portion of the glass roving cloth 5 can be prevented. Furthermore, in the present embodiment, the nonwoven fabric 4 is superposed on both surfaces of the glass roving cloth 5, and the glass roving cloth 5 is held by the two layers of the nonwoven fabric 4, and the glass roving is joined by the needle punching method. The offset of the woven perforations of the gauze 5 or the opening of the ends is more suppressed.

Hereinafter, a modified form in which various modifications are added to the above embodiment will be described. However, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

1] The structure of the inner lining material is not limited to the above embodiment, and for example, an inner lining material having the following structure may be employed.

(1) In the above embodiment, the nonwoven fabric 4 is superposed on both surfaces of the glass roving cloth 5, and the glass roving cloth 5 is sandwiched by the two nonwoven fabrics 4. Only the nonwoven fabric 4 is superposed on the glass roving cloth 5 The structure of the one side of the surface can also be obtained by preventing the offset of the woven eyelet of the glass roving cloth 5 or preventing the opening of the end portion.

(2) As a textile composed of glass fiber, it is not limited to A glass roving composed of glass rovings of glass fibers, but a glass cloth woven with glass yarns with twisted yarns can also be used.

(3) The inner lining material is a laminated structure which does not require a woven fabric composed of glass fibers and a non-woven fabric. For example, a part of the non-woven fabric 4 may be omitted. As an example, it is not necessary to alternately laminate the nonwoven fabric 4 and the glass roving fabric 5, and as shown in Fig. 14, the nonwoven fabric 4 may be laminated only on the upper and lower sides of the plurality of glass rovings 5. Alternatively, it is also possible to provide no non-woven fabric 4 at all. Further, the reinforcing fiber layer of the inner lining material is not necessarily a woven fabric of glass fiber. For example, in the same manner as in the above-described Patent Document 1, the inner lining material may be a SMC (Sheet Molding Compound) in which high-strength fibers of short fibers are dispersed in a thermosetting resin liquid.

2] The above embodiment is an example in which the cylindrical inner lining material 1 is placed in the pipe P while the inner and outer surfaces thereof are reversed, but the inner lining material of the present invention is not A construction method that reverses the inside and outside and directly pulls into the pipe P and is provided is also applicable. Further, in this case, when the pipe P is pulled in or when the inner lining material is expanded, a large external force (tensile force) acts on the inner lining material, but as in the above embodiment, the non-woven fabric 4 is When the structure of the glass roving cloth 5 is superposed, the weaving of the glass roving cloth 5 can be prevented from shifting.

3] The curable resin liquid to be immersed in the lining material 1 is not limited to those of thermosetting property, and photocurability or even room temperature curability may be used. However, in the above-described embodiment, when both ends of the laminated member 2 in the circumferential direction are temporarily joined by the hot-melt adhesive 6, the curing of the curable resin liquid and the softening of the hot-melt adhesive 6 can be temporarily performed (unbonding) Party In the formula, it is preferred to use a thermosetting resin liquid.

In the above-described embodiment, both ends of the cylindrical inner lining material 1 in the circumferential direction are joined by the hot-melt adhesive 6, and other methods may be used, for example, by sewing. However, when joining by sewing, when the internal pressure acts on the inner lining material 1 in the diameter expansion process, the sewing part is broken, and it is necessary to make a weak joint.

Further, when the inner lining material is installed in the pipe, the inner lining material is expanded in the circumferential direction at the both ends in the circumferential direction, and when the inner lining material is not expanded, the inner lining material is expanded. It is not necessary to particularly engage the circumferential end portions of the inner lining material.

5] The above embodiment is an example in which the present invention is applied to repairing an existing pipe. However, the lining material may be provided for the reinforcement of the pipe, regardless of whether it is provided or newly installed.

1‧‧‧ lining

1a‧‧‧ overlap

4‧‧‧Nonwoven

5‧‧‧glass roving cloth

6‧‧‧Hot melt adhesive

P‧‧‧ pipeline

P3‧‧‧Bend

Fig. 1 is a perspective view of an inner lining material according to the embodiment.

Fig. 2 is a perspective view of the inner lining material before being rounded into a cylindrical shape.

Figure 3 is a cross-sectional view of the inner lining material.

Fig. 4 is a view showing an enlarged view of an overlapping portion of both end portions of the inner lining material in the circumferential direction of Fig. 1 .

Fig. 5 is a cross-sectional view showing a curved portion of a pipe to be repaired.

Fig. 6 is a longitudinal sectional view of the piping when the inner lining material is provided.

Fig. 7 is a view showing a front end portion of the inner lining in the middle of the installation from the front side in the direction of progress.

Fig. 8 is a cross-sectional view showing a curved portion of the pipe after the installation process.

Fig. 9 is a sectional view taken along line IX-IX of Fig. 8.

Fig. 10 is an enlarged view showing an overlapping portion of the inner lining surrounded by the ellipse A of Fig. 9.

Fig. 11 is a cross-sectional view showing a curved portion of the pipe after the diameter expansion process.

Fig. 12 is a sectional view taken along line XII-XII of Fig. 11.

Fig. 13 is an enlarged view of the overlapping portion of the inner lining surrounded by the ellipse B of Fig. 12.

Fig. 14 is a cross-sectional view showing the inner lining of the modified embodiment.

Fig. 15 is a cross-sectional view showing a bent portion of the pipe when the pipe is repaired in a conventional process.

1‧‧‧ lining

2‧‧‧Tube textile

1a‧‧‧ overlap

A‧‧‧ ellipse

P‧‧‧ pipeline

P3‧‧‧Bend

Claims (8)

A method for applying a lining of a pipeline is a method for lining a pipeline having a curved portion, comprising: a setting step and a diameter expansion step; and the setting step is a sheet-like lining material The inner lining material is placed in the duct in a state in which the circumferential direction is overlapped in the circumferential direction, and the inner diameter lining is provided in the duct. The material is expanded while the both ends in the circumferential direction are slid in the circumferential direction. In the installation step, the curved portion of the pipe is such that the circumferential portions of the inner lining overlap. The inner lining material is provided so as to face the curved outer side of the curved portion. The lining application method of the pipeline according to the first aspect of the invention, wherein the lining material comprises a woven fabric comprising glass fibers. The lining application method of the pipeline according to the second aspect of the invention, wherein the woven fabric composed of the glass fibers is a glass roving cloth. The method for applying a lining of a pipeline according to the invention of claim 2, wherein the lining material has a nonwoven fabric in which an organic fiber is superposed on a textile composed of the glass fiber. Thereafter, the structure was joined by a needle punch. The lining application method of the pipeline according to the fourth aspect of the invention, wherein the non-woven fabric is superposed on both sides of the woven fabric composed of the glass fibers. The method for applying a lining of a pipeline according to any one of the first to fifth aspect, wherein the lining material is impregnated with a thermosetting resin liquid, and is heated in the expanding diameter step. While the inner lining material is being pressed from the inner side, the thermosetting resin liquid is cured while the outer lining material is expanded by expanding both ends of the inner lining material in the circumferential direction. The lining application method of the pipeline according to the sixth aspect of the invention, wherein the circumferentially opposite end portions of the inner lining material which are rounded in a cylindrical shape are in a state of being overlapped by a hot melt adhesive In the above-described diameter expansion step, the inner lining material is heated while being pressed from the inner side to release the joining of the circumferential end portions formed by the hot-melt adhesive. An inner lining material for a pipeline, which has a structure in which a non-woven fabric of an organic fiber and a textile composed of glass fibers are overlapped and joined by a needle punching method, and is rounded into a cylindrical shape, and both ends in the circumferential direction thereof In the overlapped state, they are joined by a hot melt adhesive.