JP2017114007A - Tubular lining material and method for manufacturing the same, and existing tube repair method using tubular lining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular lining material which can form a high quality regeneration pipe that fits a shape of an existing tube and is less likely to cause wrinkles even when the existing tube that deteriorates and causes an uneven shape and deformation is repaired, and to provide a method for manufacturing the same.SOLUTION: There are provided a tubular lining material 10 formed from a fiber mat 14 impregnated with a curable resin composition, where the fiber mat 14 in which 50 mass% or more thereof is formed of a fiber having a length of 2-20 cm based on a mass of the fiber mat excluding the curable resin composition; and a method for manufacturing the same.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tubular lining material for covering an inner surface of a pipe when a pipe such as a sewage pipe is aged, a manufacturing method thereof, and an existing pipe repair method using the tubular lining material.

  Existing pipes such as sewage pipes deteriorate with long-term use, and their useful life is generally about 50 years. Therefore, the number of sewer pipes that have exceeded the useful life is increasing year by year. In particular, sewage pipes that have deteriorated are deformed or cracked, which not only lowers the function of sewage flow, but also creates cavities in the ground due to the flow of groundwater and earth around the sewage pipe into the sewage pipe. It is also the cause of the ground collapse. In addition, sewage pipes buried in the ground may be easily affected by ground fluctuations such as earthquakes, and at present, some kind of repair is required at a predetermined time.

  As an existing pipe repair method, a method of coating an inner surface of an existing pipe with a lining material is known (Patent Document 1). In this method, a tubular lining material formed from a fiber mat impregnated with a curable resin composition is introduced into an existing pipe in an uncured state, and then sealed in a sealed space formed by closing both ends of the lining material. By introducing the compressed air, the lining material is cured by light or heat while the lining material is pressed against the inner surface of the existing pipe. Thereby, the existing pipe is repaired by forming the resin-made rehabilitation pipe inside the existing pipe.

  Generally, a lining material is manufactured by impregnating a curable resin composition into a belt-shaped fiber mat formed of fibers such as glass fibers, and spirally winding the resin composition to form a tubular shape (Patent Document 2). The produced lining material has an outer diameter slightly smaller than the inner diameter of the pipe to be repaired. Thereby, it is possible to form the rehabilitation pipe | tube closely_contact | adhered with respect to the inner surface of an existing pipe | tube by enlarging the diameter of a lining material by introduction of said compressed air.

JP 09-123279 A JP-T 09-509107

  However, there is a limit to the expansion of the diameter of conventional lining materials, and when repairing existing pipes that have deteriorated due to unevenness and deformation, obtain rehabilitation pipes that sufficiently cope with the unevenness and deformation. It was difficult to obtain rehabilitation pipes of good quality due to the occurrence of wrinkles and the like.

  Therefore, the object of the present invention is to form a high-quality rehabilitation pipe that fits the shape and is less likely to be wrinkled, even when repairing an existing pipe that has been aged and has developed uneven shapes and deformations. An object of the present invention is to provide a tubular lining material that can be produced and a method for producing the same. Moreover, it is providing the method of repairing an existing pipe | tube using this tubular lining material.

In order to solve the above-mentioned problem, the tubular lining material according to claim 1,
A tubular lining material formed from a fiber mat impregnated with a curable resin composition,
The fiber mat is characterized in that 50% by mass or more is composed of fibers having a length of 2 to 20 cm based on the mass of the fiber mat excluding the curable resin composition.

  The conventional tubular lining material is composed of long fibers whose fiber length included in the fiber lining material is longer than the circumference of the lining material to be formed (usually 50 cm or more). In the present invention, when the length of the fiber constituting the fiber mat is more than half of the fiber mat, that is, 50% by mass or more, the length of the fiber is as short as 2 to 20 cm. It becomes easy to move and the degree of diameter expansion can be increased accordingly.

  Therefore, the diameter of the lining material before the diameter expansion can be reduced by the extent that the degree of diameter expansion can be increased, and the workability of the existing pipe repair work is improved. And, when repairing existing pipes with irregularities and deformation caused by aging, the diameter can be increased according to the location, so the quality without wrinkles following the irregularities and deformation is good. A rehabilitation tube can be formed.

  The tubular lining material according to claim 2 is characterized in that the extending direction of the fibers having a length of 2 to 20 cm is 65 to 90 ° with respect to the axial direction of the tubular lining material.

  As described above, generally, the tubular lining material is formed to be slightly smaller than the inner diameter of the existing pipe, and the diameter is increased during the operation. Conventionally, since long fibers were used, in order to make the tubular lining material expandable, the angle at which the fibers extend had to be reduced with respect to the axial direction of the tubular lining material. . This is because if this angle is large, the diameter cannot be further increased. However, there is a problem that the smaller the angle, the smaller the resistance of the formed rehabilitation pipe to the force in the vertical direction.

  In the present invention, since a short fiber having a length of 2 to 20 cm is used, even when the angle is a large angle of 65 to 90 °, the diameter of the short fiber is sufficiently expanded when the diameter is expanded. It is possible. And, because the fibers are arranged at such a large angle, the rehabilitated tube that is formed can exhibit sufficient resistance to the force in the vertical direction, and ensure the strength as a ring at a high level. Is possible.

  The tubular lining material according to claim 3 is characterized in that a strip-shaped reinforcing material is further provided in parallel to the axial direction of the tubular lining material on the outer peripheral surface of the tubular lining material.

  According to this configuration, even if an axial force is applied to the tubular lining material, the presence of the strip-shaped reinforcing material provides a resistance to the force, so during construction, transportation, storage, etc. In this case, the shape of the tubular lining material as a tubular object can be sufficiently maintained. Further, for example, in a tubular lining material formed by spirally winding a fiber mat impregnated with a curable resin composition, it is easily deformed when a force in the axial direction of the lining material is applied. The arrangement of the reinforcing material is particularly effective for such a lining material. Even after construction, when an axial force is applied to the rehabilitated pipe due to crustal deformation such as an earthquake, it is possible to exert an excellent resistance to this.

  The tubular lining material according to claim 4 is characterized in that the fiber is at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber. Since these fibers have high strength, it is possible to provide a lining material capable of sufficiently increasing the strength of the formed rehabilitation pipe.

Moreover, the manufacturing method of the tubular lining material of Claim 5 which achieves the said objective is as follows.
An impregnation step of impregnating the belt-shaped fiber mat with the curable resin composition; and
A method for producing a tubular lining material, comprising: a winding step of spirally winding a strip-shaped fiber mat impregnated with the curable resin composition to form a tubular lining material, wherein the strip-shaped fiber mat comprises: 50% by mass or more based on the mass of the fiber mat excluding the curable resin composition is composed of fibers having a length of 2 to 20 cm.

  It is preferable in terms of workability to produce a tubular lining material by winding it using a belt-like fiber mat, and the produced tubular lining material is made of 50 to 20 cm long fibers. Since it is contained by mass% or more, as described above, if this tubular lining material is used, it is possible to form a rehabilitated tube having good quality free from wrinkles and the like following the unevenness and deformation.

  In the method according to claim 6, in the tubular lining material manufactured in the winding step, the extending direction of the fibers having a length of 2 to 20 cm is 65 to 65 based on the axial direction of the tubular lining material. The strip-shaped fiber mat is wound so as to be 90 °.

  According to this configuration, similarly to the second aspect, the rehabilitation pipe to be formed has excellent resistance to the force in the vertical direction, and a rehabilitation pipe having high strength can be formed. It becomes.

  The method according to claim 7 is characterized in that the band-shaped fiber mat includes the fibers having a length of 2 to 20 cm extending in the length direction of the band-shaped fiber mat.

  By using a belt-shaped fiber mat in which 2 to 20 cm fibers extend in the length direction, 2 to 20 cm fibers are formed at a predetermined angle in the tubular lining material produced in the winding step. It is possible to easily adjust the angle for achieving the above.

  The method according to claim 8, wherein after the winding step, on the outer peripheral surface of the tubular lining material, a strip-shaped reinforcing material is further arranged in parallel with the axial direction of the tubular lining material. It is characterized by including. Similarly to the third aspect, by arranging the band-shaped reinforcing material, the shape of the tubular lining material as a tubular object can be sufficiently maintained.

  The method according to claim 9 is characterized in that the fiber is at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber. Similarly to the fourth aspect, by using these high-strength fibers, it is possible to obtain a high-strength rehabilitation pipe.

  Furthermore, the present invention provides an introducing step of introducing the tubular lining material according to any one of claims 1 to 4 into an existing pipe, and expanding the diameter of the introduced tubular lining material, thereby There is provided an existing pipe repairing method including a step of pressing and intimately contacting the inner surface of the existing pipe, and a curing step of curing the expanded tubular lining material. By using the tubular lining material of the present invention, it is possible to form a rehabilitated tube that does not have wrinkles or the like that follows the unevenness and deformation of the existing tube.

  According to the present invention, in the diameter expansion operation of the tubular lining material, the diameter of the lining material before the diameter expansion can be reduced by the amount that the degree of diameter expansion can be increased as compared with the prior art, thereby improving workability. As well as being able to repair existing pipes with irregularities and deformation, the diameter can be increased according to the location, so the quality without wrinkles following the irregularities and deformation is good. It is possible to form a rehabilitation tube.

It is a perspective view which shows an example of the tubular lining material of this invention. It is explanatory drawing of a fiber mat. It is the schematic which shows the process of repairing an existing pipe | tube using a tubular lining material. It is the schematic which shows the manufacturing process of a tubular lining material.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of a tubular lining material of the present invention. The tubular lining material 10 of the present embodiment is provided with an inner film 12, a fiber mat 14 impregnated with a curable resin composition, strip-shaped reinforcing materials 16-1 and 16-2, and an outer film 18 in order from the inside. Yes. The inner film 12, the strip-shaped reinforcing materials 16-1, 16-2, and the outer film 18 are provided as necessary.

  The fiber mat 14 impregnated with the curable resin composition constitutes the main body of the tubular lining material 10, and the fiber mat is 50% by mass or more based on the mass of the fiber mat excluding the curable resin composition. , Preferably 65% by mass or more, particularly preferably 75% by mass or more, more preferably 90% by mass or more, composed of fibers having a length of 2 to 20 cm, preferably 5 to 15 cm, particularly preferably 5 to 10 cm. Yes. Although the thickness of a fiber is not specifically limited, For example, it is 10-40 micrometers. Although a 2-20 cm short fiber is contained by this content, it explains in full detail later, but the diameter expansion degree can be enlarged in the diameter expansion process in the repair work of the existing pipe.

  FIG. 2 is a side view (a) of only the fiber mat 14 and a partially enlarged schematic view (b) thereof. In the fiber mat 14, the extending direction (A direction in the drawing) of the fibers 14a having a length of 2 to 20 cm described above is the axial direction (B direction in the drawing) of the tubular lining material 10 (that is, the tubular fiber mat 14). As a reference, it is preferably 65 to 90 °. By extending the fiber at such a large angle, it is possible to exhibit excellent resistance to the vertical force applied to the rehabilitation pipe to be formed, and to maintain the strength as a ring at a high level. it can.

  Such a fiber mat 14 can be produced, for example, by the following method. That is, a plurality of rovings that are formed by bundling dozens of strands that are combined by twisting a plurality of fibers having a length of 2 to 20 cm, for example, are formed into a strip shape by combining them in the same direction. . At that time, it is preferable that the rovings are randomly arranged so that the end portions thereof are not at the same position but at different positions with reference to a direction orthogonal to the extending direction. As a result, the belt-like shape is less likely to collapse, and a structure in which fibers are more easily separated in the circumferential direction by a diameter expanding operation described later can be obtained. And then, in order to maintain the integrated strip shape, another roving is arranged in a direction different from the extending direction of the fibers having a length of 2 to 20 cm, and for example, a mist-like adhesive is formed thereon. The fiber mat 18 can be formed by spraying or the like. The strip-shaped fiber mat can be formed into a tubular fiber mat by, for example, spirally winding. In this case, the impregnation of the curable resin composition into the fiber mat may be performed before or after winding, but before winding is preferable in terms of excellent workability.

  The fibers constituting the fiber mat 14 are preferably at least one selected from the group consisting of glass fibers, carbon fibers, and aramid fibers, for example. Since these fibers have high strength, it is possible to provide a lining material capable of sufficiently increasing the strength of the formed rehabilitation pipe. The said fiber can be used in combination of 2 or more type.

  The inner film 12 and the outer film 18 shown in FIG. 1 may be those conventionally used for manufacturing a tubular lining material. For example, a polyethylene film, a polypropylene film, a polyethylene terephthalate film, or the like can be used. When the curable resin composition is a photocurable resin composition, an inner film having transparency to the irradiated light is used.

The curable resin composition impregnated in the fiber mat 14 may be a light curable resin composition or a heat curable resin composition. Any curable resin composition can be used in which a polymerizable resin such as vinyl ester resin or unsaturated polyester resin is dissolved in a solvent such as styrene. In the case of a photocurable resin composition, an azo compound or the like In the case of a thermosetting resin composition, an organic peroxide that reacts with heat is blended. The weight ratio of the fiber mat 14 and the curable resin composition is, for example, 50 to 55% by mass for the fiber mat and 45 to 50% by mass for the curable resin composition. The weight of the fiber mat 14 is, for example, 500 to 800 g / m ² , preferably 600 to 700 g / m ² .

  As the strip-shaped reinforcing members 16-1 and 16-2, any material can be used as long as it can exert a resistance against the axial direction of the fiber mat 14. A preferred material is a fiber mat, preferably a fiber mat impregnated with a curable resin composition. In the illustrated example, the belt-shaped reinforcing members 16-1 and 16-2 are provided at two locations on the outer periphery of the fiber mat 14 in opposite directions, but may be one location or three or more locations. The strip-shaped reinforcing members 16-1 and 16-2 are provided in parallel with the axial direction of the tubular lining material 10.

  Even if an axial force is applied to the tubular lining material 10 by arranging the band-shaped reinforcing material, resistance to the force is exhibited by the presence of the band-shaped reinforcing materials 16-1 and 16-2. The shape of the tubular lining material as a tubular object can be sufficiently maintained during construction, transportation, storage, and the like. Further, for example, in a tubular lining material formed by spirally winding a fiber mat impregnated with a curable resin composition, it is easily deformed when a force in the axial direction of the lining material is applied. The arrangement of 16-1 and 16-2 is particularly effective for such a lining material. Even after construction, when an axial force is applied to the rehabilitated pipe due to crustal deformation such as an earthquake, it is possible to exert an excellent resistance to this.

  Next, the repair method of the existing pipe | tube using the lining material of this invention is demonstrated. The existing pipe repairing method of the present invention may be performed using the lining material of the present invention, and the operation itself may be performed in the same manner as before. FIG. 3 is an explanatory view of the existing pipe repairing method of the present invention.

The existing pipe repair method of the present invention is an introduction process for introducing the tubular lining material 10 of the present invention into the existing pipe 100,
A diameter expansion step of pressing the tubular lining material 10 against the inner surface of the existing pipe 100 by expanding the diameter of the introduced tubular lining material 10;
A curing step for curing the tubular lining material 10 in an expanded state;
including.

  In this figure, a sewer pipe (sewer main) is shown as an example of an existing pipe. After the tubular lining material 10 is introduced into the existing pipe 100, both ends are closed with the closing members 62-1 and 62-2, and compressed air is introduced into the closed space 70 formed thereby, thereby the tubular lining material. A diameter expansion process is performed by expanding the diameter 50.

  Thereafter, by irradiating the lining material with light from the inside of the lining material, the curable resin composition of the lining material is cured, thereby forming a resin rehabilitation pipe inside the existing pipe. Thus, the existing pipe repair method of this invention is performed. The inner film of the lining material is peeled off as necessary. The illustrated example is an example using a tubular lining material using a photocurable resin composition, but in the case of a tubular lining material using a thermosetting resin composition, steam or the like is used instead of light irradiation. Heat.

  In the figure, reference numeral 90 denotes a blocking member that blocks the flow of sewage. Reference numerals 66 and 72 denote work devices. Air is supplied from the work device 66 through the hose 68 to the inside of the tubular lining material 10 and discharged from the hose 74, so that air flows in the sealed space 70. Has occurred and flammable substances are being discharged. Reference numeral 60 denotes a lamp coupling body for irradiating the lining material 50 with light. After finishing the curing process, a rehabilitation pipe is formed inside the existing pipe 100 by performing an end treatment if necessary.

  The following effects are produced by using the tubular lining material 10 of the present invention. That is, the conventional tubular lining material 10 is composed of long fibers that are at least the circumference of the lining material to be formed (usually 50 cm or more). In the present invention, the diameter of the lining material is increased when the fiber mat is composed of fibers having a length as short as 2 to 20 cm with 50% by mass or more based on the mass of the fiber mat excluding the curable resin composition. At this time, the fibers can easily move in the direction in which the fibers are separated from each other, and the degree of diameter expansion can be increased accordingly.

  Therefore, as the degree of diameter expansion can be increased, the diameter of the lining material before diameter expansion can be reduced, so that workability is improved, and existing pipes that have become obsolete and deformed are repaired. In this case, since the degree of diameter expansion can be set according to the location, it is possible to form a rehabilitated tube having good quality without wrinkles or the like following the shape of unevenness or deformation.

  In general, the tubular lining material is formed to be slightly smaller than the inner diameter of the existing pipe, and the diameter is expanded during the operation. Conventionally, since long fibers were used, in order to make the tubular lining material expandable, the angle at which the fibers extend had to be reduced with respect to the axial direction of the tubular lining material. . This is because if this angle is large, the diameter cannot be further increased. However, there is a problem that the smaller the angle, the smaller the resistance of the formed rehabilitation pipe to the force in the vertical direction.

  In the present invention, since a short fiber having a length of 2 to 20 cm is used, even when the angle is a large angle of 65 to 90 °, the diameter of the short fiber is sufficiently expanded when the diameter is expanded. It is possible. And, because the fibers are arranged at such a large angle, the rehabilitated tube that is formed can exhibit sufficient resistance to the force in the vertical direction, and ensure the strength as a ring at a high level. Is possible.

  Next, a method for producing the tubular lining material of the present invention will be described. FIG. 4 is a schematic view showing an example of a process for producing a lining material. For manufacturing the lining material, a mandrel 40 is used, and a belt-like fiber mat 20 is wound thereon. A cylindrical inner film 12 is mounted on the mandrel 40 in advance. The inner film 12 is used as necessary, and has a role of protecting the inner surface of the manufactured lining material.

  In the present embodiment, the tubular material 22 is formed by spirally winding the fiber mat 20 impregnated with the curable resin composition in advance on the outer periphery of the inner film 12.

  The fiber mat 20 is stored in a roll shape in advance, and is unwound from the rolls 20-1 and 20-2 during the winding process. In the present embodiment, two fiber mat rolls 20-1 and 20-2 are arranged around the mandrel 40, and the fiber mat 20 is fed out from each roll 20-1 and 20-2 so as to be inner. It is wound on the outer periphery of the film 12. Then, the fiber mat 20 from the roll 20-1 and the fiber mat 20 from the roll 20-2 are alternately wound and sequentially stacked. In the illustrated example, two rolls 20-1 and 20-2 are arranged at positions facing each other with respect to the mandrel 40. However, the number of rolls of the fiber mat may be one, not limited to two. You may arrange more than one. That is, one or more rolls may be used.

  The fiber mat 20 is wound with the angle adjusted so that the extending direction of the above-described fibers having a length of 2 to 20 cm is 65 to 90 ° with respect to the axial direction of the formed tubular lining material.

  The fiber mat 20 is preferably such that fibers having a length of 2 to 20 cm extend in the length direction of the fiber mat 20. Thereby, adjustment to the desired angle can be easily performed. In this case, it is preferable that the spiral angle when the belt-shaped fiber mat 20 is spirally wound is 65 to 85 °. The spiral angle is indicated by an angle A in FIG. 4 and the inclination of the fiber mat 20 with respect to the axial direction of the tubular object 22 (that is, the axial direction of the formed tubular lining material) is taken as a reference. This is the angle that indicates whether it is turned. Thereby, in a tubular lining material, the operation | work which makes a 2-20 cm length fiber within the range of 65-90 degrees with respect to the axial direction of a tubular lining material becomes easy.

  Next, the strip-shaped reinforcing members 16-1 and 16-2 are arranged on the outer periphery of the tubular object 22 formed by winding the fiber mat 20 so as to extend in the axial direction. In the illustrated example, the two strip-shaped reinforcing members 16-1 and 16-2 are arranged in directions facing each other with respect to the mandrel 40. By disposing the belt-shaped reinforcing material, a resistance force is exerted against the force applied in the axial direction of the tubular object 22 wound in a spiral shape, and it is possible to prevent the shape of the lining material from collapsing. In addition, the arrangement | positioning process of this strip | belt-shaped reinforcement material is performed as needed. In the illustrated example, the two strip-shaped reinforcing members 16-1 and 16-2 are arranged, but the number of the strip-shaped reinforcing members may be one or three or more. The width of the band-shaped reinforcing material is, for example, 10 to 50% with respect to the circumferential length of the tubular object 22.

  Thereafter, outer films 18-1 and 18-2 are further provided on the outer periphery of the tubular product. In the illustrated example, the two strip-shaped outer films 18-1 and 18-2 are disposed so as to face each other. And the width direction edge part of the two strip | belt-shaped outer films 18-1 and 18-2 is thermocompression-bonded in the thermocompression-bonding apparatus 30, and it mutually fuse | melts. Thereby, the inner film 12, the tubular material 22, and the strip | belt-shaped reinforcements 16-1 and 16-2 are enclosed by the outer films 18-1 and 18-2 which were united. As for the widths of the outer films 16-1 and 16-2, the total length of the outer films 16-1 and 16-2 may be longer than the circumferential length of the tubular object 22.

  A tubular lining material is thus manufactured. The manufactured lining material is crushed and folded for storage and transportation.

  In addition, the extending direction of the fibers having a length of 2 to 20 cm in the belt-shaped fiber mat 20 may not be the length direction of the belt-shaped fiber mat 20, and in that case, 2 to 20 cm in the manufactured lining material. The spiral angle may be adjusted so that the extending direction of the fibers is 65 to 90 ° with respect to the axial direction of the tubular lining material to be manufactured.

  In addition, this invention is not limited to the structure of said each embodiment, A various deformation | transformation is possible within the range of the summary of invention. Hereinafter, the present invention will be described by way of examples.

(1) Production of Tubular Lining Material 1 (Invention) Band-shaped glass fiber mat (width 840 mm, after curing) pre-impregnated with a photocurable resin composition (including unsaturated polyester resin, styrene and photopolymerization initiator) The thickness is 0.7 mm, the weight of the glass fiber mat is 650 g / m ² , and the amount of the impregnating resin composition is 600 g / m ² ), as shown in FIG. After winding at a spiral angle, a tubular lining material (thickness of 2.8 mm) is obtained by disposing the belt-like reinforcing materials 16-1 and 16-2 and the outer films (polyethylene film) 18-1 and 18-2. It was. The used lining material is formed so as to form a belt-like fiber mat using a glass fiber having a length of 2 to 20 cm (thickness: 20 μm). In this fiber mat, glass fibers having a length of 2 to 20 cm extend in the length direction of the belt-like mat.

(2) Production of Tubular Lining Material 2 (Comparative Example) Lining in the same manner as in (1) above, except that a glass fiber having a length of 30 cm was used instead of the glass fiber having a length of 2 to 20 cm. The material was manufactured.

(3) Evaluation With respect to the above two lining materials 1 and 2, the lining material is expanded by introducing the lining material inside the uneven or deformed pipe, sealing both ends and introducing compressed air inside. It was. Thereafter, the lining material was cured by irradiating the lining material with ultraviolet rays using an ultraviolet lamp, and a rehabilitated tube was obtained. When the presence or absence of wrinkles in the rehabilitated pipe was examined, the rehabilitated pipe of the lining material 1 was free of wrinkles and had good quality. On the other hand, it was recognized that the rehabilitation pipe of the lining material 2 was wrinkled.

(4) Strength measurement After sealing both ends of the prepared lining material, the diameter of the lining material is expanded by supplying compressed air to the inside, and in this state, an ultraviolet lamp previously introduced inside the lining material, By irradiating ultraviolet rays from the inside of the lining material, the lining material was cured to form a rehabilitation tube sample. The following evaluation was performed on this sample.

(1) Short-term flexural modulus and long-term flexural modulus The flexural modulus was measured according to JISK 7035. The short-term bending elastic modulus is an elastic modulus measured immediately after a predetermined load is applied to the rehabilitated pipe sample. The long-term bending elastic modulus is an elastic modulus measured after 10,000 hours have elapsed after applying a predetermined load to the rehabilitated pipe sample.

(2) Short-term bending strength The bending strength was measured according to JISK7035. The short-term bending strength is a bending strength measured immediately after a predetermined load is applied to the rehabilitation tube sample.

DESCRIPTION OF SYMBOLS 10 Tubular lining material 12 Inner film 14 Fiber mat 14a Fiber 16-1, 16-2 Strip | belt-shaped reinforcement material 18, 18-1, 18-2 Outer film 20 Fiber mat 20-1, 20-2 Roll 22 of fiber mat Tubular thing 30 Thermocompression bonding apparatus 40 Mandrel 60 Light irradiation apparatus 62-1 and 62-2 Closing member 100 Existing pipe 102-1 and 102-2 Manhole

Claims (10)

A tubular lining material formed from a fiber mat impregnated with a curable resin composition,
The tubular lining material, wherein the fiber mat is composed of fibers having a length of 2 to 20 cm, based on the mass of the fiber mat excluding the curable resin composition.   2. The tubular lining material according to claim 1, wherein an extension direction of the fibers having a length of 2 to 20 cm is 65 to 90 ° with respect to an axial direction of the tubular lining material.   3. The tubular lining material according to claim 1, wherein a strip-shaped reinforcing material is further provided in parallel with the axial direction of the tubular lining material on the outer peripheral surface of the tubular lining material.   The tubular lining material according to any one of claims 1 to 3, wherein the fiber is at least one selected from the group consisting of glass fiber, carbon fiber, and aramid fiber. An impregnation step of impregnating the belt-shaped fiber mat with the curable resin composition; and
A winding step of spirally winding a band-shaped fiber mat impregnated with the curable resin composition to form a tubular lining material;
A method for producing a tubular lining material comprising:
50% by mass or more of the band-shaped fiber mat is composed of fibers having a length of 2 to 20 cm based on the mass of the fiber mat excluding the curable resin composition. In the winding step,
In the manufactured tubular lining material, the belt-shaped fiber mat is wound so that the extending direction of the fibers having a length of 2 to 20 cm is 65 to 90 ° with respect to the axial direction of the tubular lining material. The manufacturing method of Claim 5 characterized by the above-mentioned.   The method according to claim 5 or 6, wherein the band-shaped fiber mat includes the fibers having a length of 2 to 20 cm extending in a length direction of the band-shaped fiber mat. After the winding step,
The reinforcing material arrangement | positioning process which arrange | positions a strip | belt-shaped reinforcement material in parallel with the axial direction of the said tubular lining material further on the outer peripheral surface of the said tubular lining material is characterized by the above-mentioned. The method according to item.   The method according to claim 5, wherein the fiber is at least one selected from the group consisting of glass fiber, carbon fiber, and aramid fiber. An introducing step of introducing the tubular lining material according to any one of claims 1 to 4 into an existing pipe,
Expanding the diameter of the introduced tubular lining material, thereby expanding the diameter of the tubular lining material against the inner surface of the existing pipe, and
A curing step of curing the expanded tubular lining material;
Existing pipe repair methods including

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