JP3881938B2 - Tubular liner, thermosetting resin tube, and method for repairing and reinforcing tubular inner layer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tubular liner for use in lining the inner peripheral surface of an existing pipe in order to repair and reinforce tubular bodies such as water pipes and sewage pipes, and thermosetting that is impregnated with resin and still has flexibility. In addition, the present invention relates to a method for repairing and reinforcing the inner surface of a pipe using such a tubular liner and a thermosetting resin pipe.
[0002]
[Prior art]
Recently, in order to repair and reinforce existing pipes such as water pipes and sewage pipes buried in the ground, a thermosetting resin pipe that has not yet cured resin is inserted into the inner peripheral surface of the existing pipe and then lined. There is a reverse lining method.
[0003]
As shown in FIG. 6, this reverse lining method involves impregnating a long bag-like felt bag (tubular liner) 1 with a thermosetting resin, and applying a thermosetting resin tube 1 </ b> A that still has flexibility with water pressure P. In this method, the tube is inverted and inserted into the tube 100, and then the water in the tube is heated to cure the resin, thereby forming a cured resin tube in the existing tube 100.
[0004]
This inversion lining method is attracting attention because it can be constructed in a short period of time and is economical.
[0005]
The present inventors have proposed a tubular liner and a thermosetting resin tube that can be suitably used for this inversion lining method, as described in JP-A No. 2001-347569. The configuration will be briefly described with reference to FIG.
[0006]
As shown in FIG. 8, the tubular liner 1 includes an inner layer 2A formed of a long reinforcing fiber sheet 21A in which reinforcing fibers f are arranged in one direction, and a cylindrical film outer layer 3 disposed on the outer periphery of the inner layer 2A. And have. The inner layer 2A has a first fiber sleeve 21A in which the reinforcing fibers f are oriented at a predetermined angle α with respect to the longitudinal axis direction of the tubular liner 1, and the reinforcing fibers f are predetermined with respect to the longitudinal axis direction of the tubular liner 1A. And a second fiber sleeve 21B oriented at an angle β.
[0007]
As shown in FIGS. 9 and 10, the long reinforcing fiber sheet 21 for forming the inner layer 2 </ b> A of the tubular liner 1 has a reinforcing fiber layer 21 a held by a resin-permeable support sheet 24. The reinforcing fiber layer 21a is arranged at a predetermined angle (α or β) with respect to the main axis, and substantially, that is, a predetermined predetermined value except for the leading end and the trailing end of the continuous reinforcing fiber sheet 21. It is formed by a reinforcing fiber f of a long fiber having a length (F). The continuous reinforcing fiber sheet 21 having a sheet shape is not yet impregnated with the matrix resin.
[0008]
The tubular liner 1 having the above-described configuration can be made thinner to avoid a decrease in the inner diameter of the tube and increase the reinforcement strength. In addition, the tube can be reversed and inserted into the tube after being impregnated with the resin. It has the features that it is extremely easy to work and does not become a bag.
[0009]
[Problems to be solved by the invention]
However, as a result of further research and experiments by the present inventors, the tubular liner 1 having the above-described configuration provides many benefits as described above, but the resin-permeable support sheet 24 is biaxial or A mesh-like body such as triaxial or cloth, or a non-woven fabric, is laminated on one or both sides of the reinforcing fiber layer 21a and heated and pressurized, and the warp yarn 25 and weft yarn 26 portions of the mesh-like support sheet 24 are reinforced fibers. Since it is welded to the layer 21a, the stretchability in the longitudinal direction and the radial direction of the tubular liner 1 is constrained by the support sheet 24, and the operation when inserting the tubular liner 1 into the tube, or the tubular liner 1 In some cases, the work of reversing was difficult. Further, in order to fit the inner surface of the tube exactly without generating wrinkles, the tubular liner 1 is prepared in advance with high accuracy by adapting it to the tube to be repaired and reinforced because the stretchability in the longitudinal direction and the radial direction is poor. Was necessary.
[0010]
Therefore, the object of the present invention is to be impregnated with a tubular liner and a resin that have elasticity in the longitudinal direction and the radial direction, are extremely easy to reverse and insert into the tube after resin impregnation, and do not become a wrinkle. The present invention provides a foldable thermosetting resin tube and a method for repairing and reinforcing a tubular inner layer using these members.
[0011]
[Means for Solving the Problems]
The above object is achieved by a tubular liner and a thermosetting resin tube according to the present invention. In summary, according to the first invention, in a tubular liner having a fiber sleeve laminate formed by laminating a plurality of long reinforcing fiber sheets in which reinforcing fibers are arranged in one direction,
The plurality of reinforcing fiber sheets are integrated by stitching at a predetermined interval in the circumferential direction of the fiber sleeve laminate and along the longitudinal axis direction of the fiber sleeve laminate. A tubular liner is provided. According to an embodiment, the reinforcing fibers of each reinforcing fiber sheet are oriented at different angles with respect to the longitudinal axis direction of the fiber sleeve laminate. According to another embodiment, a nonwoven fabric, felt or glass cloth layer is disposed on the inner and / or outer peripheral side of the fiber sleeve laminate. According to another embodiment, the non-woven fabric, felt, or glass cloth layer disposed on the inner and / or outer peripheral side of the fiber sleeve laminate is bonded or stitched to the fiber sleeve laminate in whole or in part. It is integrated by the ring. According to another embodiment, a cylindrical film outer layer is provided on the outermost periphery of the tubular liner.
[0012]
According to the second invention, there is provided a foldable thermosetting resin tube characterized in that the tubular liner is impregnated with a thermosetting resin.
[0013]
According to 3rd invention, the said tubular liner is affixed on the internal peripheral surface of a tubular body, The repair reinforcement method of the tubular inner layer characterized by the above-mentioned is provided. Further, the tubular liner is drawn into the inner surface of the tubular body, and then inserted into the inner peripheral side of the fiber sleeve laminate while inverting the resin-impregnated felt, and the fiber sleeve laminate is adhered to the inner peripheral surface of the tubular body. can do.
[0014]
According to a fourth aspect of the present invention, there is provided a method for repairing and reinforcing a tubular inner layer, wherein the tubular liner is inserted while being inverted into a tube, and the fiber sleeve laminate is adhered to the inner peripheral surface of the tubular body. Is done.
[0015]
According to the fifth invention, a plurality of long reinforcing fiber sheets in which reinforcing fibers are arranged in one direction are laminated to form a reinforcing fiber sheet laminate, and the reinforcing fiber sheet laminate is laminated with the reinforcing fiber sheets. Integrate by stitching along the longitudinal direction at a predetermined interval in the width direction of the body, then join both ends along the longitudinal direction to make a tubular liner, and impregnate the tubular liner with resin A method for repairing and reinforcing a tubular inner layer is provided, which is adapted to the inner surface of a tubular body.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the tubular liner, the thermosetting resin tube, and the method for repairing and reinforcing the tubular inner layer according to the present invention will be described in more detail with reference to the drawings.
[0017]
Example 1
FIG. 1 shows an embodiment of a tubular liner 1 adapted to the inner surface of a tubular body such as a water pipe or a sewer pipe according to the present invention. The tubular liner 1 of the present invention has a fiber sleeve laminate 2A. Further, as will be described in detail later, a resin-made cylindrical film outer layer 3 can be disposed on the outer periphery of the fiber sleeve laminate 2A, and an insulating material layer 4 is disposed on the inner periphery of the fiber sleeve laminate 2A. can do.
[0018]
In this embodiment, the fiber sleeve laminate 2A includes a first fiber sleeve 21A in which the reinforcing fibers f are oriented at a predetermined angle α with respect to the longitudinal axis direction of the tubular liner 1, and the reinforcing fibers f are tubular liners. And a second fiber sleeve 22A oriented at a predetermined angle β with respect to one longitudinal axis direction. The reinforcing fiber orientation angles α and β may be arbitrary angles, but are different from each other in order to effectively exert the reinforcing effect on the bending force, in particular, + 30 ° to 90 ° or −30 ° to −90 °. Is preferred. For example, α = + 45 ° and β = −45 °.
[0019]
In the first embodiment shown in FIG. 1, the fiber sleeve laminate 2A has been described as having the first and second fiber sleeves 21A and 22A. However, as shown in FIG. For example, the fiber sleeve laminate 2A may further include a fiber sleeve 23A in which the reinforcing fibers are arranged in the circumferential direction, that is, the orientation angle (α) of the reinforcing fibers is 90 °. In the case of the second embodiment, the reinforcing effect against the hoop force of the existing pipe after reinforcement can also be increased.
[0020]
Furthermore, in another embodiment, the fiber sleeve laminate 2A may include other third and fourth fiber sleeves (not shown) similar to the first and second fiber sleeves 21A and 22A. The fiber orientation angles of the third and fourth fiber sleeves may be the same orientation angles as the first and second fiber sleeves 21A and 22A, or may be different orientation angles. The reinforcing fiber orientation angle aspect is not limited to that described above, and various aspects can be adopted as necessary.
[0021]
Another embodiment of the present invention is shown in FIG. As described above, according to the present invention, the fiber sleeve laminate 2A has a plurality of fiber sleeves 21A to 23A in which the reinforcing fibers f are arranged. As shown in FIG. Felt layers 2M (2M ₁ , 2M ₂ ) can also be disposed on the inner and outer peripheral sides of 2A, respectively. Of course, one of the felt layers 2M ₁ and 2M ₂ can be eliminated. As the felt layers 2M ₁ and 2M ₂ , polyester felt can be used as in the conventional case.
[0022]
According to the present invention, since the reinforcing strength is greatly increased by having the fiber sleeve laminate 2A in which the reinforcing fibers f are arranged in one direction, the felt layers 2M ₁ , 2M ₂ are compared with the conventional ones. Can be significantly reduced, for example, by about 50 to 100%. By reducing the thickness of the felt layer, it is possible to avoid a reduction in the inner diameter of the tube. In addition, the work can be easily reversed and inserted into the tube after the resin impregnation.
[0023]
Next, with reference to FIG. 4, an example of a long reinforcing fiber sheet laminate 2 for forming the fiber sleeve laminate 2A of the tubular liner 1 of the present invention will be described. The reinforcing fiber sheet laminate 2 has a predetermined continuous length (L). Usually, for example, a long one of 50 to 100 m is used.
[0024]
In the present embodiment, the continuous reinforcing fiber sheet laminate 2 has a first reinforcing fiber sheet 21 and a second reinforcing fiber sheet 22. The first reinforcing fiber sheets 21 are arranged at a predetermined angle (α) with respect to the main axis, and the second reinforcing fiber sheets 22 are arranged at a predetermined angle (β) with respect to the main axis. In other words, the continuous reinforcing fiber sheet laminate 2 is formed of long-fiber reinforcing fibers f having a predetermined length (F) excluding the leading end and the trailing end. The continuous reinforcing fiber sheet laminate 2 having a sheet shape is not yet impregnated with the matrix resin.
[0025]
In the present specification, the “main axis” means an axis along the longitudinal direction of the continuous reinforcing fiber sheet 21.
[0026]
According to the present invention, the first reinforcing fiber sheet 21 and the second reinforcing fiber sheet 22 are integrated by stitching S along the longitudinal direction of the reinforcing fiber sheet laminate 2. The width interval (s1) of each stitching S in the width direction of the reinforcing fiber sheet laminate 2 is 3 to 30 mm. The feed (s2) of the stitching S is about 2 to 10 mm.
[0027]
The stitching S generally uses a polyester yarn, but cotton, nylon, vinylon, glass fiber, or the like can be used.
[0028]
More specifically, the stitching S is used for stitching in which dozens to hundreds of fibers arranged in a sheet shape continuously oriented at + 45 °, −45 °, etc. are arranged in the sheet width direction. The needle and stitch yarn are continuously sewn in the longitudinal direction of the sheet, and two or several layers of oriented fibrous materials are integrated with the stitch yarn. The stitching S may be a chain stitch as shown or a zigzag tricot stitch.
[0029]
The continuous reinforcing fiber sheet laminate 2 of this embodiment has a predetermined width (W) according to the desired tube diameter of the fiber sleeve laminate 2A of the tubular liner 1. That is, the stitching width interval (s1) is an appropriate predetermined interval in the circumferential direction of the sleeve when the reinforcing fiber sheet laminate 2 is formed into the fiber sleeve laminate 2A.
[0030]
In this embodiment, the reinforcing fibers f constituting the reinforcing fiber sheets 21 and 22 are carbon fibers, glass fibers, or organic fibers such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, and polyester. Furthermore, it is possible to use a mixture of one or more steel fibers. The fiber basis weights of the reinforcing fiber sheets 21 and 22 are 50 to 600 g / m ² .
[0031]
Further, as the felt layers 2M ₁ and 2M ₂ used in the fiber sleeve laminate 2A of the embodiment of FIG. 3, polyester felt can be used as in the conventional case. Such felt layers 2M ₁ and 2M ₂ can also be integrated with the reinforcing fiber sheet laminate 2 by stitching.
[0032]
For example, in FIG. 1 and FIG. 2, in the case of the tubular liner 1 using carbon fibers as the reinforcing fibers 24 of the fiber sleeves 21A and 22A, after the construction by the reverse lining method to the existing pipe 100, the carbon fibers are included. The fiber sleeve 22A is in direct contact with the inner surface of the existing pipe 100. Since carbon fiber is conductive, it can be considered that the existing tube 100 is corroded due to the electrolytic corrosion action and the reinforcing effect is lowered due to the long-term use.
[0033]
Therefore, it is preferable to provide the insulating material layer 4 as the innermost layer of the fiber sleeve laminate 2 </ b> A, as indicated by a dashed line in FIG. Although any insulating material can be used for the insulating material layer 4, glass cloth, scream cloth, or glass nonwoven fabric can be preferably used.
[0034]
Of course, when the tubular liner shown in FIGS. 1 and 2 is directly adapted to the inner surface of the existing tube 100, the fiber sleeve 21A using carbon fiber is directly adhered to the inner surface of the existing tube 100. As the outer layer of 21A, the insulating material layer 4 can be provided instead of the film outer layer 3.
[0035]
These inner and outer insulating material layers 4 can also be integrated with the reinforcing fiber sheet laminate 2 by stitching.
[0036]
Example 2
Next, a method for producing the fiber sleeve laminate 2A using the long reinforcing fiber sheet laminate 2 will be described.
[0037]
The continuous reinforcing fiber sheet laminate 2 having the configuration shown in FIG. 4 described in Example 1 is cut into a predetermined length, and as shown in FIG. 5, along the longitudinal direction of a mandrel 60 having a predetermined diameter. The main axis of the reinforcing fiber sheet laminate 2 is matched, wound around the surface of the mandrel, wrapped in the circumferential direction by a length (R), for example, 100 mm, and this wrap portion is stitched in the length direction to have a predetermined tube diameter. 2 A of fiber sleeve laminated bodies which were made are produced.
[0038]
The outer peripheral portion of the fiber sleeve laminate 2A is covered with a cylindrical resin film, or a resin film tape is spirally wound to form a cylindrical film outer layer 3 as an outer layer of the fiber sleeve laminate 2A. be able to.
[0039]
If carbon fibers are used as the reinforcing fibers f of the fiber sleeves 21A and 22A, first, for example, a glass cloth sheet is wound around the mandrel to form the insulating material layer 4, and then the fiber sleeve as described above. A laminate 2A and a cylindrical film outer layer 3 are formed. Of course, when the insulating material layer 4 is integrated with the fiber sleeves 21A and 22A by stitching, the step of winding the glass cloth sheet around the mandrel is omitted.
[0040]
Example 3
The tubular liner 1 produced as described above is usually impregnated with the thermosetting resin into the fiber sleeve laminate 2 in a folded state. Thereby, the thermosetting resin is impregnated into the fiber sleeve laminate 2 including the fiber sleeves 21A and 22A, the felt layer 2M, and the thermosetting resin tube 1A is manufactured.
[0041]
When the resin film outer layer 3 is provided on the outer periphery of the thermosetting resin tube 1A, the matrix resin does not leak to the outside during the resin impregnation, and the resin impregnation treatment is performed efficiently.
[0042]
The tubular liner 1 impregnated with the resin, that is, the thermosetting resin tube 1A is stored in a cool box or the like so that the resin is not cured, and is transported to the site. As in the conventional case shown in FIG. 6, the thermosetting resin tube 1A still having flexibility is inserted into the existing tube 100 in a flat state, and its tip is inverted, and the existing tube or jig is inserted. Etc.
[0043]
Next, as shown in FIG. 6, the thermosetting resin tube 1A is continuously inserted into the tube 100 by water pressure P and inverted and the fiber sleeve laminate 2A portion of the tubular liner 1 is in close contact with the inner wall of the existing tube. . Thereafter, the water in the tube is heated to cure the resin, and a cured resin tube is formed in the existing tube 100.
[0044]
According to the present invention, the fiber sleeve laminate 2A is formed of, for example, long fiber sleeves 21A and 22A in which the reinforcing fibers f are arranged in one direction, and each fiber sleeve 21A and 22A has a longitudinal direction. Therefore, the reinforcing fiber f in each of the fiber sleeves 21A and 22A has a large elasticity in the longitudinal direction and the radial direction. It can move relatively freely, so that the reversing operation is performed very smoothly, and it is difficult to become a trap.
[0045]
As another method for reinforcing and repairing the existing pipe 100, as shown in FIG. 7, first, the tubular liner 1A impregnated with resin and not yet cured is drawn into the inner surface of the pipe 100, and then the inner circumference of the tubular liner 1A is obtained. It is also possible to insert the resin-impregnated felt 2 </ b> M on the side while being inverted and stick the tubular liner 1 </ b> A and the resin-impregnated felt 2 </ b> M to the inner peripheral surface of the tube 100.
[0046]
If a plurality of tubular liners are bonded to the inner surface of the tube 100, and if there is no particular need for stretchability in the longitudinal direction and the radial direction, the reinforcing fiber laminate integrated by stitching according to the present invention 9 and FIG. 10, a conventional unidirectional reinforcing fiber sheet having low stretchability as shown in FIG. 9 or FIG. 10, or a tubular liner manufactured using a woven sheet is used. It is good also as a structure which also has.
[0047]
Performance test Next, the performance of the thermosetting resin tube 1A of the present invention will be described.
[0048]
Using the continuous reinforcing fiber sheet laminate 2 shown in FIG. 4 described in Example 1, the tubular liner 1 shown in FIG. 1 was prepared and impregnated with resin to obtain a thermosetting resin tube 1A.
[0049]
In the continuous reinforcing fiber sheet laminate 2 used in this test, the reinforcing fiber sheets 21 and 22 are PAN-based carbon fiber strands having an average diameter of 7 μm and a converging number of 12,000, and are arranged at a fiber basis weight of 200 g / m ² . Then, both the reinforcing fiber sheets 21 and 22 were integrated into each other by stitching using polyester yarn as a thread. At this time, the stitching was performed by chain stitch, the stitching width interval (s1) was 5 mm, and the feed (s2) was 5 mm.
[0050]
The long reinforcing fiber sheet laminate 2 produced in this way had a width (W) of 740 mm, a length (L) of 50 m, and an angle with respect to the main axis of the reinforcing fiber was 45 °. Using this reinforcing fiber sheet 21, a fiber sleeve laminate 2A was produced in the manner shown in FIG. The reinforcing fiber orientation angles of the fiber sleeve laminate 2A were α = + 45 ° and β = −45 °.
[0051]
A vinyl chloride resin film having a thickness of 200 μm was wound around and adhered to the outside of the fiber sleeve laminate 2 </ b> A to form a cylindrical film outer layer 3.
[0052]
The tubular liner 1 thus obtained had an inner diameter of 201.4 mm, an outer diameter of 204.0 mm, and a length of 50 m.
[0053]
The tubular liner 1 was impregnated with an epoxy resin to obtain a thermosetting resin tube 1A. The amount of resin in the fiber sleeve laminate 2A was 1065 g / m ² .
[0054]
As a comparative example, using the continuous reinforcing fiber sheet 21 shown in FIG. 9, the tubular liner 1 shown in FIG. 8 was produced, and impregnated with resin to obtain a thermosetting resin tube 1A.
[0055]
The reinforcing fiber sheet 21 was made of the same material and specifications as in the present example. The fiber sleeves 21A and 21B were made of the reinforcing fiber sheet 21 having the same configuration except that the orientation angles were α = + 45 ° and β = −45 °.
[0056]
The reinforcing fiber layer was held by a mesh-like support sheet 23 that was a biaxial mesh-like body using glass fibers (number 300d, number of driven-in pieces / 10 mm) as the warp yarn 25 and the weft yarn 26. The interval (w1, w2) between the yarns of the biaxial mesh-like body was 10 mm.
[0057]
The warp yarns 25 and the weft yarns 26 of the mesh-like support sheet 23 were impregnated with a thermoplastic resin at a content of 80% by weight.
[0058]
Resin curing of thermosetting resin tube 1A using reinforcing fiber sheet laminate 2 of the present invention and thermosetting resin tube 1A of a comparative example using reinforcing fiber sheet 21 held on mesh-like support sheet 23 The mechanical properties of the subsequent resin tube were examined, and it was found that the thermosetting resin tube 1A of the present invention showed the mechanical properties of the resin tube after resin curing equivalent to that of the comparative example.
[0059]
Moreover, in the evaluation of workability, when the thermosetting resin tube 1A using the reinforcing fiber sheet laminate 2 of the present invention is used, the generation of wrinkles is less than that of the comparative example, and the work time is shortened. It was found to be excellent.
[0060]
【The invention's effect】
As described above, the tubular liner and the thermosetting resin pipe of the present invention, and the method for supplying and reinforcing the pipe using these, the plurality of reinforcing fiber sheets forming the tubular liner are arranged in the circumference of the fiber sleeve laminate. Since it is integrated by stitching along the longitudinal axis direction of the fiber sleeve laminated body at a predetermined interval in the direction, it has elasticity in the longitudinal direction and the radial direction, and is also used for pipe repair and reinforcement Inversion and insertion into the tube after impregnation with the resin is extremely easy, and there is little generation of wrinkles.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a tubular liner according to the present invention.
FIG. 2 is a perspective view showing another embodiment of the tubular liner according to the present invention.
FIG. 3 is a perspective view showing another embodiment of the tubular liner according to the present invention.
FIG. 4 is a perspective view showing an embodiment of a continuous reinforcing fiber sheet laminate according to the present invention.
FIG. 5 is a view for explaining an embodiment of a method for producing a tubular liner of the present invention.
FIG. 6 is a diagram for explaining a reverse lining method.
FIG. 7 is a diagram illustrating another lining method.
FIG. 8 is a perspective view showing an example of a conventional tubular liner.
FIG. 9 is a perspective view showing an example of a conventional continuous reinforcing fiber sheet.
10 is an exploded perspective view of the conventional continuous reinforcing fiber sheet of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tubular liner 1A Thermosetting resin tube 2 Reinforced fiber sheet laminate 2A Fiber sleeve laminate 2M (2M ₁ , 2M ₂ ) Felt layer 3 Cylindrical film outer layers 21, 22 Reinforced fiber sheets 21A, 22A, 23A Fiber sleeve

Claims (14)

In a tubular liner having a fiber sleeve laminate formed by laminating a plurality of long reinforcing fiber sheets in which reinforcing fibers are arranged in one direction,
The plurality of reinforcing fiber sheets are integrated by stitching at predetermined intervals in the circumferential direction of the fiber sleeve laminate and along the longitudinal axis direction of the fiber sleeve laminate. Tubular liner. The tubular liner according to claim 1, wherein the reinforcing fibers of each of the reinforcing fiber sheets are oriented at different angles with respect to the longitudinal axis direction of the fiber sleeve laminate. The tubular liner according to claim 2, wherein an orientation angle of the reinforcing fibers is + 30 ° to 90 ° or -30 ° to -90 °. The tubular liner according to any one of claims 1 to 3, wherein a nonwoven fabric, a felt, or a glass cloth layer is disposed on an inner peripheral side and / or an outer peripheral side of the fiber sleeve laminate. The nonwoven fabric, felt, or glass cloth layer disposed on the inner peripheral side and / or the outer peripheral side of the fiber sleeve laminate is integrally or partially integrated with the fiber sleeve laminate by bonding or stitching. The tubular liner of claim 4. The tubular liner according to claim 1, further comprising a cylindrical film outer layer on an outermost periphery of the tubular liner. The reinforcing fiber forming the reinforcing fiber sheet is carbon fiber, glass fiber, organic fiber such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, polyester, and further, steel fiber, etc. Alternatively, the tubular liner according to any one of claims 1 to 6, wherein a plurality of types are mixed and used. The fiber basis weight of the reinforcing fiber sheet, the tubular liner according to any one of claims 1-7, characterized in that a 50~600g / m ^2. A collapsible thermosetting resin tube, wherein the tubular liner according to any one of claims 1 to 8 is impregnated with a thermosetting resin. The thermosetting resin tube according to claim 9, wherein the thermosetting resin is an epoxy resin, a phenol resin, an unsaturated polyester resin, a vinyl ester resin, a polyimide resin, or an acrylic resin. A method for repairing and reinforcing a tubular inner layer, comprising sticking the tubular liner according to any one of claims 1 to 5 to an inner peripheral surface of a tubular body. The tubular liner is drawn into the inner surface of the tubular body, and then a resin-impregnated felt is inserted into the inner peripheral side of the fiber sleeve laminate while being inverted, and the fiber sleeve laminate is adhered to the inner peripheral surface of the tubular body. The method for repairing and reinforcing a tubular inner layer according to claim 11. A tubular inner layer repairing and reinforcing method for a tubular inner layer, wherein the tubular liner according to claim 6 is inserted while being inverted into a tube, and the fiber sleeve laminate is adhered to the inner peripheral surface of the tubular body. A plurality of long reinforcing fiber sheets in which reinforcing fibers are arranged in one direction are laminated to form a reinforcing fiber sheet laminate, and the reinforcing fiber sheet laminate is arranged at a predetermined interval in the width direction of the reinforcing fiber sheet laminate. In addition, they are integrated by stitching along the longitudinal direction, and then both ends along the longitudinal direction are joined together to produce a tubular liner, and this tubular liner is impregnated with a resin and conforms to the inner surface of the tubular body. A method for repairing and reinforcing a tubular inner layer.

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