JP2014201013A - Lining material, and lining base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining material excellent in slidability when inserted reversedly, low elution properties, pressure resistance and follow-up properties durable against ground displacement, and to provide a lining base material being a material of the lining material.SOLUTION: A lining material 1 is obtained by winding a laminate into a cylindrical shape, which laminates includes: a resin impregnation layer 3 having a sheet-shaped base material impregnated with an uncured resin; and an airtight layer 2 for covering one surface of the resin impregnation layer. The airtight layer is a resin film comprising polyethylene obtained by polymerizing ethylene by using a metallocene catalyst or an ethylene-α-olefin copolymer obtained by polymerizing ethylene and α-olefin having 3 or more carbon atoms by using the metallocene catalyst. The lining material comprises a cylindrical member and the resin film for covering the first surface of the cylindrical member and is constituted so that the second surface of the cylindrical member is opposed to one surface of the resin impregnation layer. The thickness tof the cylindrical member and that tof the resin film satisfy a relationship being t≥t.

Description

  The present invention relates to a lining material for rehabilitating the inner surface of an existing pipe and a base material that is a material of the lining material.

  Various methods of repairing existing pipes such as sewer pipes, water pipes, and agricultural water pipes are proposed for repairing existing pipes that are buried in the ground without excavating the ground. Has been. For example, there is a method of forming a lining layer on the inner surface of a pipe line by pressing a tubular lining material on the inner peripheral surface of the pipe line by using fluid pressure and curing a resin impregnated in advance. In this method, a method is also devised for inserting a tubular lining material into the pipeline.

For example, in the rehabilitation method described in Patent Document 1, a tubular lining material is folded into a flat shape and deployed in a state of being stacked in a closed container. And the said lining material is attached to the opening end outer periphery of the inversion nozzle connected to the airtight container, and it is set as the structure which reversely inserts a tubular lining material in a pipe line by making water pressure act in an airtight container. As a result, the expanded lining material has the resin-absorbing base material in close contact with the inner peripheral surface of the pipe in the pipe to form a lining layer.
Patent Document 2 discloses a structure in which nonwoven fabric / glass roving cloth / nonwoven fabric / glass roving cloth / nonwoven fabric / glass roving cloth / nonwoven fabric are alternately laminated as a lining material of a pipe, and the laminated members are joined by a needle punch. Is disclosed. The lining material is formed in a tubular shape by rounding the laminated member into a cylindrical shape and bonding both ends.

  Patent Document 3 discloses a lining material that reinforces a portion where both ends of a sheet-like base material are sewn in a cylindrical shape for the purpose of preventing air leakage when the lining material is inflated and preventing leakage of sewage. ing. However, since there is still anxiety about the strength of the reinforcing portion, there is a concern that the followability to the ground displacement is low. Patent Documents 4 to 5 disclose lining materials using a cylindrical member having no joint.

JP 2003-165158 A JP 2012-86386 A JP 2001-179832 A JP 2007-261195 A JP 2008-55615 A

  A configuration example of the lining material is shown in FIGS. The resin film 21 constituting the hermetic layer 2 of the lining material 1 covers the outside of the lining material 1 before being inverted and inserted into the pipeline, and is inserted into the pipeline and installed in the pipeline. Cover the inner surface. The resin film 21 has slipperiness at the time of reverse insertion, pressure resistance to withstand pressure and expansion by a fluid at the time of execution, low elution of resin components due to heat generation due to hardening of the resin impregnated layer 3 at the time of execution, and after construction The ability to follow the ground displacement is required, and further development is required.

  The present invention has been made in view of the above circumstances, and is a lining material with improved slipping property, low elution property, pressure resistance, and followability to withstand ground displacement during reverse insertion, and a material of the lining material. It is an object to provide a lining substrate.

  According to a first aspect of the present invention, a laminate including a resin-impregnated layer having a sheet-like base material impregnated with an uncured resin and an airtight layer covering one surface of the resin-impregnated layer is formed in a cylindrical shape. A resin film made of polyethylene or an ethylene / α-olefin copolymer obtained by polymerizing ethylene or ethylene and an α-olefin having 3 or more carbon atoms using a metallocene catalyst. It is the lining material characterized by having.

  A resin film made of polyethylene or ethylene / α-olefin copolymer polymerized using a metallocene catalyst is excellent in mechanical strength such as tensile strength, tear strength and impact strength. As a result of studies by the present inventors, when the resin film is applied to the airtight layer of the lining material, the resin film has good slipperiness, so that the pressure for blowing fluid such as air when inserting the lining material in reverse (maximum Reversal pressure) can be reduced, blocking at the time of reversal insertion is suppressed, pressure resistance to withstand pressure and diameter expansion by the fluid at the time of enforcement, and the resin film is generated by heat generated by curing of the resin impregnated layer Almost unaffected, the heat generation makes it difficult for the components of the resin film to elute into water, and the water pressure resistance (followability to ground displacement) in a state of being subjected to distortion and bending due to ground displacement after construction is excellent. I found it.

The airtight layer is composed of a tubular member and the resin film covering the first surface of the tubular member, and the second surface of the tubular member faces one surface of the resin-impregnated layer. May be.
With this configuration, the maximum reversal pressure during reversal insertion can be further reduced, and blocking can be further suppressed. In addition, since heat generated when the resin-impregnated layer is cured is hardly transmitted to the resin film, thermal denaturation and component elution of the resin film can be more reliably prevented.

The relationship between the thickness t ₁ of the cylindrical member and the thickness t ₂ of the resin film may be 2t ₂ ≧ t ₁ .
With this configuration, the maximum reversal pressure during reversal insertion can be further reduced, and blocking can be further suppressed. Moreover, the water pressure resistance in the state which received the distortion and bending by the ground displacement after construction can be improved more.

The sheet-like substrate may have a configuration in which a sandwich structure laminated in the order of nonwoven fabric / reinforcing fiber material / nonwoven fabric is entangled by mechanical entanglement processing.
With this configuration, it is possible to further improve the water pressure resistance in a state of receiving distortion and bending due to ground displacement after construction.

The second aspect of the present invention is a lining substrate characterized in that the resin-impregnated layer constituting the lining material is not impregnated with the uncured resin.
In the step of obtaining the lining material by impregnating the lining substrate with an uncured resin, an operation of inverting the lining substrate may be performed. According to the second aspect of the present invention, the fluid pressure necessary for the reversing operation can be reduced and blocking at the time of reversal can be suppressed, so that the manufacturing efficiency of the lining material can be increased.

According to the lining material of the present invention, since the slipping property, pressure resistance, low elution property and followability to withstand ground displacement at the time of reverse insertion are improved, the work efficiency of the existing pipe rehabilitation work is improved, and after construction Reliability during use can be improved. Moreover, since the elution of the resin component from the resin film that is in direct contact with the liquid flowing through the pipeline is reduced, it is also useful in rehabilitation of waterworks.
According to the lining substrate of the present invention, since the slipperiness required for reversal is excellent, the production efficiency of the lining material can be improved.

It is a schematic cross section of the lining material which concerns on 1st embodiment of this invention. It is a schematic cross section of the laminated body which consists of an airtight layer and the resin impregnation layer which comprise the said lining material. It is a schematic cross section of the sheet-like base material in the lining material. It is explanatory drawing which shows the needle punch process of the said sheet-like base material. It is explanatory drawing which shows an example of the needle used for the said needle punch process. It is sectional drawing which shows the state by which the said lining material was reversely inserted in the existing pipe | tube. It is a schematic cross section which shows the state which coat | covered the inner surface of the existing pipe | tube with the said lining material. It is sectional drawing which shows the modification of the lining material of 1st embodiment. It is a schematic cross section which shows the structure of the resin impregnation layer in the lining material shown in FIG. It is sectional drawing which shows the state by which the lining material shown in FIG. 8 was reversely inserted in the existing pipe | tube. It is a schematic cross section which shows the state which coat | covered the inner surface of the existing pipe | tube with the lining material shown in FIG. It is explanatory drawing which shows the rehabilitation method of the existing pipe using the said lining material. It is sectional drawing which shows the lining material of 2nd embodiment of this invention. It is sectional drawing which shows the modification of the lining material of 2nd embodiment. It is a schematic cross section which shows the structure of the resin impregnation layer in the lining material of 3rd embodiment of this invention. It is sectional drawing which shows the modification of the resin impregnation layer in the lining material of 3rd embodiment. It is explanatory drawing which shows the needle punch process of the sheet-like base material in 3rd embodiment. It is explanatory drawing which shows an example of the needle used for the said needle punch process. It is sectional drawing which shows the lining material of 4th embodiment of this invention. It is sectional drawing which shows the modification of the lining material of 4th embodiment. It is sectional drawing which shows the lining material produced in the Example. It is a partially broken perspective view which shows the rehabilitation pipe | tube for a test produced in the Example.

  Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments, but the present invention is not limited to such embodiments.

《Lining material》
The lining material forms a lining layer on the inner peripheral surface of an existing pipe to be repaired, and is formed in a substantially cylindrical shape having an outer diameter smaller than the inner diameter of the existing pipe in advance. The lining material according to the present invention includes an airtight layer and a resin-impregnated layer, and various forms are included in the type of the resin film of the airtight layer and the configuration of the resin-impregnated layer. Hereinafter, the lining material according to the present invention will be described by taking some embodiments as examples.

<First embodiment>
As shown in FIG. 1, the lining material 1 according to the first embodiment of the present invention includes a resin-impregnated layer 3 having a sheet-like base material impregnated with an uncured resin, and an airtight coating covering one side 3 a of the resin-impregnated layer 3. The laminated body provided with the layer 2 is a lining material formed in a cylindrical shape.

  The airtight layer 2 covers the outer peripheral surface of the resin impregnated layer 3 and is formed in a cylindrical shape as a whole. Here, the shape of the cross section (transverse cross section) perpendicular to the cylindrical longitudinal direction is not particularly limited. In FIG. 1, the cross section is circular, but the lining material 1 is soft and flexible, and thus is not necessarily limited to a circle, and may be a shape in which the circle is crushed.

<Resin film of airtight layer 2>
The airtight layer 2 has a resin film made of polyethylene or an ethylene / α-olefin copolymer obtained by polymerizing ethylene or ethylene and an α-olefin having 3 or more carbon atoms using a metallocene catalyst. As the resin film, a commercially available resin film synthesized with a metallocene catalyst may be used.

The metallocene catalyst is not particularly limited as long as it has a high polymerization activity with respect to ethylene, and may have a high polymerization activity with respect to ethylene and an α-olefin having 3 or more carbon atoms. A catalyst is preferred. By using a metallocene catalyst, a polymer (polymer) having few side chain branches, a narrow molecular weight distribution, and a uniform comonomer distribution can be obtained. The obtained polymer has few low molecular weight components and sticky components. Moreover, since the crystal size is uniform, the transparency is good and an ultra-low density polymer is obtained.
By using polyethylene or polyethylene / α copolymer having such characteristics as the resin film of the lining material, the above-described characteristics can be imparted to the lining material.

  When the polyethylene or ethylene / α-olefin copolymer is synthesized, an auxiliary agent or cocatalyst for activating the metallocene catalyst may be used. Examples of the cocatalyst include methylaluminoxane (MAO).

  As a synthesis method using a metallocene catalyst for obtaining the polyethylene or ethylene / α-olefin copolymer, a known solution polymerization method, high pressure polymerization method, and gas phase polymerization method can be applied. Specific examples include Table 2007/094378, JP 2006-181831, JP 2006-213770, JP 2006-239877, JP 2006-346976, JP 2009-052058, JP 2009-078420, JP 2009-. 083110, JP2009-096119, JP2009-185238, JP2009-185239, JP2010-006988, JP2010-167581, JP2010-180344, JP2010-189473, JP2011-235486, The method described in patent 3011657 is mentioned. The method described in Japanese Patent No. 3011657 is also applicable.

  The polymer constituting the resin film may be polyethylene obtained by polymerizing only ethylene, or may be an ethylene / α-olefin copolymer polymerized by adding an appropriate amount of α-olefin to ethylene. The polyethylene and the ethylene / α-olefin may be linear polymers. By adding an α-olefin other than ethylene, the density and strength of the polymer can be adjusted. The α-olefin means an alkene having a carbon-carbon double bond at the α-position (terminal carbon).

As alpha olefins other than ethylene, C3-C20 alpha olefins are mentioned, for example. Specifically, propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene and the like.
When α-olefin other than ethylene is copolymerized as a comonomer, the α-olefin may be used alone or in combination of two or more.

  The ethylene / α-olefin copolymer is preferably a polymer obtained by polymerizing a monomer material composed of an α-olefin containing ethylene in a proportion of 50% by weight or more. The monomer material may contain 80% by weight or more of ethylene, 90% by weight or more of ethylene, 95% or more of ethylene, or 98% of ethylene. It may be contained by weight% or more, and ethylene may be 100 weight%.

The physical properties of the polyethylene or ethylene / α-olefin copolymer cast film particularly suitable for the resin film constituting the airtight layer 2 are as follows.
The melt mass freight according to JIS K 7210 and ISO1133 is preferably 2.0 to 3.8 g / 10 minutes, more preferably 2.3 to 3.5 g / 10 minutes, and 2.6 to 3.2 g / 10 minutes. Is more preferable.
Density conforming to JIS K 7112 and ISO1183 is preferably 890~990kg / ^{m 3,} more preferably 910~970kg / ^{m 3,} more preferably 930~950kg / ^{m 3.}
The tensile yield stress based on JIS K 7161,7162 and ISO527-1,527-2 is preferably 10 to 22 Mpa, more preferably 12 to 20 Mpa, and even more preferably 14 to 18 Mpa.
The tensile fracture stress based on JIS K 7161,7162 and ISO527-1,527-2 is preferably 14 to 26 Mpa, more preferably 16 to 24 Mpa, and still more preferably 18 to 22 Mpa.
The tensile fracture nominal strain based on JIS K 7161,7162 and ISO527-1,527-2 is preferably 390 to 490%, more preferably 410 to 470%, still more preferably 430 to 450%.
The flexural modulus according to JIS K 7171 and ISO178 is preferably 540 to 660 Mpa, more preferably 560 to 640 Mpa, and even more preferably 580 to 620 Mpa.
The Charpy impact strength according to JIS K 7111 and ISO 179-1 is preferably NB.
The type D durometer hardness based on JIS K 7215 and ISO868 is preferably 54 to 63, more preferably 57 to 66, and still more preferably 60 to 63.
The environmental stress crack resistance (ESCR) according to ASTM D1693 is preferably 1000 hours or more.
The Vicat softening point based on JIS K 7206 and ISO306 is preferably 110 to 122 ° C, more preferably 112 to 120 ° C, and still more preferably 114 to 118 ° C.
The melting point based on JIS K 7121 and ISO11357-3 is preferably 123 to 136 ° C, more preferably 125 to 133 ° C, and still more preferably 127 to 131 ° C.

  The resin film preferably satisfies any one or more of the above physical properties, more preferably satisfies any two or more, and still more preferably satisfies any three or more. The commercially available resin film used in Example 1 satisfies the “more preferable” range in all of the above physical properties.

<Structure of airtight layer 2>
The structure of the airtight layer 2 may be a single-layer structure composed only of the resin film. As another structure, the structure with which the laminated body shown in FIG. 2, for example was mentioned. The laminate includes a cylindrical member 22, a resin film 21 covering the first surface 22a (outer peripheral surface) of the cylindrical member 22, and a resin impregnated layer covering the second surface 22b (inner peripheral surface) of the cylindrical member 22. 3 are laminated to form a cylinder. The airtight layer 2 includes a resin film 21 and a cylindrical member 22. A cylindrical member 22 is laminated so as to face one side 3 a of the resin impregnated layer 3.
With this structure, the maximum reversal pressure during reversal insertion of the lining material 1 can be further reduced, and blocking can be further suppressed. In addition, since heat generated when the resin impregnated layer 3 is cured is hardly transmitted to the resin film 21, thermal denaturation and component elution of the resin film 21 can be prevented more reliably.

  Although the thickness in particular of the resin film 21 is not restrict | limited, For example, 0.1 mm-5.0 mm are preferable, 0.2 mm-3.5 mm are more preferable, 0.4 mm-2.0 mm are still more preferable.

  The cylindrical member 22 is not particularly limited as long as the resin film 21 can cover the first surface 22a of the cylindrical member 22. For example, a nonwoven fabric, a woven fabric, a cloth, a mesh-like resin, or the like is formed in a cylindrical shape. The member made is mentioned. The method for coating the cylindrical member 22 with the resin film 21 is not particularly limited, and a known method can be applied. For example, as described in Patent Documents 4 and 5, a method in which the cylindrical member 22 is folded flat and the resin film 21 is extruded and coated on the first surface 22a of the cylindrical member 22 can be applied.

  The cylindrical member 22 may be formed in a cylindrical shape by joining both ends (both sides) of the sheet of the material by mechanical entanglement processing, sewing (sewing), bonding, or the like, or no joint portion. It may be formed in a state. From the viewpoint of improving the mechanical strength, pressure resistance, and followability to ground displacement of the cylindrical member 22, the cylindrical member 22 preferably does not have a joint.

Relationship thickness _{t 1} and the thickness _{t 2} of the resin film 21 of the tubular substrate 22 is preferably a 2t ₂ ≧ _{t 1.} With this relationship, the maximum reversal pressure during reversal insertion of the lining material 1 can be further reduced, and blocking can be further suppressed. Moreover, the water pressure resistance in the state which received the distortion and bending by the ground displacement after construction can be improved more.

  The resin film 21 and the cylindrical member 22 constituting the airtight layer 2 are preferably bonded (adhered) in advance before being inverted and inserted into the pipeline. The bonding method is not particularly limited, and examples thereof include a method in which the resin film 21 is heated and pressure-bonded to the cylindrical member 22. The resin film 21 and the cylindrical member 22 do not need to be completely joined, and may be joined partially to the extent that positional displacement does not occur.

  After the airtight layer 2 (cylindrical member 22) and the resin-impregnated layer 3 are inverted and inserted into the pipe, the resin contained in the resin-impregnated layer 3 soaks into or contacts the cylindrical member 22 by pressurization. It may be bonded (adhered) by curing. Therefore, in the stage before being installed in the pipeline, the cylindrical member 22 and the resin-impregnated layer 3 do not need to be joined in advance, and are partially joined or not joined at all. You may just be doing it. At least a part of the cylindrical member 22 and the resin-impregnated layer 3 are laminated in close contact so that the cylindrical member 22 and the resin-impregnated layer 3 are joined when the resin of the resin-impregnated layer 3 is cured. Is preferred.

<Structure of resin impregnated layer 3>
The resin-impregnated layer 3 is not particularly limited as long as it is a layer having a sheet-like substrate 31 that can be impregnated with an uncured resin. The sheet-like base material 31 constituting the resin impregnated layer 3 may be one sheet or two or more sheets. In the configuration of FIG. 1, the resin-impregnated layer 3 includes an outer peripheral sheet-like substrate (first sheet-like substrate) and an inner peripheral sheet-like substrate (second sheet-like substrate). ing. The outer peripheral surface 3 a of the sheet base 31 on the outer peripheral side is covered with the airtight layer 2.

  The sheet-like base material 31 may be, for example, a sheet base material composed of only one sheet-like felt, nonwoven fabric, woven fabric, cloth, porous resin, or the like. As another configuration, as shown in FIG. 3, a reinforcing material C made of a reinforcing fiber material is provided between a nonwoven fabric A and a nonwoven fabric B having a thickness smaller than that of the nonwoven fabric A. The structure by which the laminated body of the nonwoven fabric A, the reinforcing material C, and the nonwoven fabric B is intertwined and integrated is mentioned.

  The nonwoven fabric A and the nonwoven fabric B are base materials impregnated with a base material resin mainly composed of a liquid curable resin, and are made of a material having flexibility and excellent resin impregnation properties. As the fibers of the nonwoven fabric A and the nonwoven fabric B, fibers made of a high-strength and highly elastic material such as polyester, high-performance polyethylene (HPPE), or polypropylene are preferable. The fiber form of the non-woven fabric A and the non-woven fabric B may be any form such as felt, mat, or web including continuous filaments or staple fibers as long as it is a flexible and porous material.

  Non-woven fabric A and non-woven fabric B are made of long-fiber non-woven fabric such as spunbonded non-woven fabric bonded by self-adhesion by spinning, spunlace non-woven fabric entangled with high-pressure water flow, or a special shape needle (punch needle). Short fiber nonwoven fabrics such as entangled needle punch nonwoven fabrics are preferred. In particular, as the non-woven fabric A, a non-woven fabric by needle punch is preferable, and it becomes easy to ensure a sufficient thickness.

  For example, the thickness of the nonwoven fabric A and the nonwoven fabric B is preferably 0.1 mm to 20.0 mm, and more preferably 0.2 mm to 10.0 mm. If the thickness is less than 0.1 mm, it is too thin to obtain an entanglement force between the fibers, and if it exceeds 20.0 mm, it may be difficult to mechanically entangle.

  When the nonwoven fabric B is thinner than the nonwoven fabric A, the nonwoven fabric B is preferably formed with a thickness of 2% or more with respect to the thickness of the nonwoven fabric A. Moreover, the thickness of the nonwoven fabric B may be formed with a thickness equivalent to the thickness of the nonwoven fabric A. Other thickness configurations of the nonwoven fabric A and the nonwoven fabric B will be described later.

  The reinforcing material C is a sheet-like material made of a reinforcing fiber material such as glass fiber, aramid fiber, or carbon fiber. Considering strength, price, etc., it is preferably made of glass fiber. The reinforcing fiber material constituting the reinforcing material C is preferably pretreated with a silane coupling agent in order to enhance the adhesion with the base material resin. As the form of the reinforcing material C, for example, a chopped strand mat, a roving cloth, or a stitch base material can be suitably used.

In the lining material 1 of the first embodiment, the sheet-like base material 31 of the resin impregnated layer 3 uses a needle punched nonwoven fabric having a thickness of 2.0 mm and a basis weight of 400 g / m ² as the nonwoven fabric A, and the nonwoven fabric B has a thickness of 0. A spunbonded nonwoven fabric with a diameter of 3 mm and a basis weight of 70 g / m ² is used. As the reinforcing material C, a glass chopped strand mat having a thickness of 0.4 mm and a basis weight of 600 g / m ² is used. As the airtight layer 2 covering the sheet-like base material 31, a sheet material having a thickness of 1.2 mm in which a resin film material polymerized by using the metallocene catalyst described above is laminated on a tubular woven fabric can be used.

  In the sheet-like base material 31, a laminated body in which the nonwoven fabric A, the reinforcing material C, and the nonwoven fabric B are laminated in order is entangled with each other by mechanical entanglement processing, and is compressed into a sheet shape. . Various methods for entangling the sheet-like base material 31 can be mentioned, but the needle punch method is most preferable.

  The sheet-like base material 31 is needle punched by penetrating needles in the laminating direction from the non-woven fabric side arranged to face another overlapping sheet-like base material 31. In this case, as shown in FIG. 4, the sheet-like base material 31 is needle punched by penetrating a plurality of needles 8 in the lamination direction of the laminate from the nonwoven fabric A side. In the needle punching process, a plurality of needles 8 that move up and down at high speed are repeatedly stabbed into the laminated body, which is flattened, and the fibers are entangled.

  As the needle 8, for example, as shown in FIG. 5, it is preferable that a needle tip portion 81 is formed sharply and a plurality of barbs 83 having a triangular cross section are formed on a blade portion 82. The barb 83 has undercut openings formed in a plurality of directions and hooks fibers. In addition, the barb 83 is formed in a cross-sectional triangular shape having an inclined surface on the distal end side of the needle tip portion 81 and a parallel surface substantially parallel to the laminate on the base portion 84 side. As a result, the fibers on the thick nonwoven fabric A side can be suitably entangled with the fibers on the thin nonwoven fabric B side, and the layers can be well integrated.

  The configuration of the needle 8 is not limited to that illustrated in FIG. 5, and may be any configuration as long as the fiber can be entangled from the thick nonwoven fabric side to the thin nonwoven fabric side in the laminate. . That is, the cross-sectional shape of the barb 83 may be another shape such as a rectangle or a protrusion, and the barb 83 may be formed in one direction or multiple directions.

By such needle punching, the sheet-like base material 31 is rich in bulk properties, and separation between fibers is suppressed. That is, in the sheet-like base material 31, the needle 8 of the needle punch penetrates from the nonwoven fabric A side to the nonwoven fabric B, and a hole is formed by the reciprocation of the needle 8. On the inner peripheral surface of the hole, the fibers of the non-woven fabric A and the non-woven fabric B are entangled, and are connected to each other with the reinforcing material C interposed therebetween. Thereby, it is not necessary to drive the needle 8 from both sides of the nonwoven fabric A and the nonwoven fabric B, and needle punching from one side of the nonwoven fabric A is sufficient. In this case, the number of needle punches can be suppressed with a relatively small number of, for example, about 30 / cm ² .

  Since the sheet-like base material 31 has a configuration in which the reinforcing material C is sandwiched between the thick nonwoven fabric A and the thin nonwoven fabric B and is entangled with the needle punch from the nonwoven fabric A side, the fibers of the nonwoven fabric A and the nonwoven fabric B are entangled. It becomes very good and can be integrated without delamination. Further, since the integrity of the nonwoven fabric A and the nonwoven fabric B can be improved, the number of needles 8 can be reduced, and as a result, damage to the reinforcing fibers of the reinforcing material C can be reduced. The strength characteristic of C can be sufficiently exhibited.

  A plurality of sheet-like base materials 31 may be disposed on the resin-impregnated layer 3 of the lining material 1. In the first embodiment, as shown in FIG. 1, two sheet-like base materials 31 are disposed on the resin-impregnated layer 3. In the resin-impregnated layer 3, the sheet-like base material 31 on the inner peripheral side is rounded with the surface of the nonwoven fabric A facing the outer peripheral side, and ends in the width direction are overlapped to form an overlap part 32, which is substantially cylindrical. It is said that. On the other hand, the sheet-like base material 31 on the outer peripheral side is rounded with the surface of the nonwoven fabric A directed toward the inner peripheral side, and overlaps the end portions in the width direction to constitute the overlap portion 32, and is substantially cylindrical. Has been. The width dimension of each sheet-like base material 31 is longer than the inner peripheral length of the existing pipe 4. Thereby, the two sheet-like base materials 31 which comprise the resin impregnation layer 3 are arrange | positioned in the direction where the surface of the nonwoven fabric A mutually faces, and is laminated | stacked by the substantially cylindrical shape.

  In the lining material 1, two sheet-like base materials 31 overlap in the thickness direction in the resin-impregnated layer 3, and the total thickness of the nonwoven fabrics A and A located between the reinforcing materials C is the innermost circumferential side in the resin-impregnated layer 3. It is comprised so that it may become thicker than the sum total of the thickness of the nonwoven fabric B located in and the nonwoven fabric B located in the outermost periphery side.

  The sheet-like base materials 31 are joined to each other at the overlapped portion 32 that is overlapped. In the resin impregnated layer 3, the overlap portion 32 is joined by a hot melt adhesive mainly composed of a thermoplastic resin material, for example. As an example of the hot melt adhesive, an adhesive mainly composed of ethylene vinyl acetate copolymer resin (EVA) which is excellent in all of flexibility, adhesiveness, thermal stability and the like is preferable. In addition, hot-melt adhesives such as polyurethane, polyamide, polyester, olefin, and synthetic rubber can also be suitably used.

  The lining material 1 is disposed in the existing pipe 4 in a state where the resin impregnated layer 3 is impregnated with an uncured base material resin and inverted as shown in FIG. Thereafter, the lining material 1 is expanded in diameter in the existing pipe 4 to form a lining layer as shown in FIG.

  The base material resin is mainly a known thermosetting resin or photo-curing resin. Among them, an epoxy resin mainly composed of an epoxy resin having a relatively low viscosity, excellent physical properties after curing, and low cost. A mixture is preferred. Moreover, as a main ingredient of the base material resin, a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin, or a melamine resin may be used.

  In addition, as an epoxy-type main ingredient, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, etc. can be used suitably. This type of epoxy-based main agent has a very high viscosity, and usually has a viscosity of 20000 mPa · s or higher under a low temperature condition of 10 ° C. or lower. Therefore, it is preferable to lower the viscosity of the epoxy base agent by adding a diluent or selectively adding a low viscosity curing agent. The diluent is not particularly limited as long as it can lower the viscosity of the epoxy base agent, and may be a reactive diluent or a non-reactive diluent. Further, both may be used in combination.

  Examples of reactive diluents include monophenols such as phenol, cresol, ethylphenol, propylphenol, p-tert-butylphenol, p-tert-amylphenol, hexylphenol, octylphenol, nonylphenol, dodecylphenol, octadecylphenol and terpenephenol. Examples thereof include those having a glycidyl ether group at the terminal, such as glycidyl ether. Examples of the non-reactive diluent include dioctyl phthalate, dibutyl phthalate, and benzyl alcohol. Furthermore, one kind selected from these diluents may be used alone, or two or more kinds may be used in combination.

  Although it does not specifically limit as a low viscosity hardening | curing agent, The thing which can reduce the viscosity of an epoxy-type main ingredient, can ensure a moderate hardening rate, and also does not elute after hardening is preferable. Examples of curing agents having such properties include amine-based curing agents such as aliphatic polyamines, aromatic polyamines, and alicyclic polyamines. Among them, an aliphatic polyamine having a very low viscosity, excellent physical properties after curing, and inexpensive is preferably used. Specific examples of the aliphatic polyamine include polyoxypropylenediamine, trimethylolpropane poly (oxypropylene) triamine, metaxylenediamine, 1,3-bis (aminomethyl) cyclohexane, and modified products thereof. . One kind selected from these curing agents may be used alone, or two or more kinds may be used in combination.

  As described above, in the lining material 1 of the first embodiment, the plurality of sheet-like base materials 31 of the resin-impregnated layer 3 are arranged in a substantially cylindrical shape by overlapping the end portions in the width direction, The sheet-like base material 31 disposed on the inner peripheral side has the surface of the nonwoven fabric A directed to the outer peripheral side, and the sheet-like base material 31 disposed on the outer peripheral side has the surface of the nonwoven fabric A directed to the inner peripheral side. The non-woven fabrics A are arranged so that they face each other.

  FIG. 8 is a cross-sectional view showing a modification of the lining material 1 of the first embodiment, FIG. 9 is a cross-sectional view schematically showing the configuration of the resin-impregnated layer in the lining material, and FIG. 10 is a state in which it is inverted and inserted into an existing pipe FIG. 11 is a cross-sectional view schematically showing an existing pipe renewed with the lining material.

  In the lining material 1, as shown in FIG. 8, the resin-impregnated layer 3 may be disposed by superposing two sheet-like base materials 31 on each other. That is, as shown in FIG. 8, the resin-impregnated layer 3 is configured by rolling the two sheet-like base materials 31 into a substantially cylindrical shape in a state in which the surfaces of the nonwoven fabric A face each other. Also good.

  The resin-impregnated layer 3 of the lining material 1 has two sheet-like base materials 31 arranged on the outer peripheral side with the surface of the nonwoven fabric A facing the outer peripheral side for the sheet-like base material 31 arranged on the inner peripheral side. The sheet-like base material 31 is overlapped in a state where the surface of the nonwoven fabric A is directed to the inner peripheral side, and is shaped into a substantially cylindrical shape. In addition, the two sheet-like base materials 31 are arranged with one end portion in the width direction overlapped with the other end portion in an overlapped state, and an overlap portion 32 is provided.

  In this case, the lining material 1 is disposed in the existing pipe 4 in a state where the resin impregnated layer 3 is impregnated with an uncured base material resin and inverted as shown in FIG. Is done. Moreover, as shown in FIG. 11, the diameter is expanded in the existing pipe 4 to form a lining layer.

  Further, as a modification of the lining material 1, the sheet-like base material 31 includes a nonwoven fabric A, a reinforcing material C, and a nonwoven fabric B, which are laminated in order, and fibers by other mechanical bonding methods such as a spunlace method and a stitch bond method. A configuration in which they are intertwined and integrated may be used.

(Rehabilitation method for existing pipes)
Next, the rehabilitation method of the existing pipe 4 using the lining material 1 will be described with reference to FIG. FIG. 12 is an explanatory diagram showing a rehabilitation method for the existing pipe 4 using the lining material 1.

  Prior to the rehabilitation work of the existing pipe 4, when there is a fluid such as sewage in the existing pipe 4, the water draining work for temporarily removing from the existing pipe 4 is performed. As shown in FIG. 12, the existing pipe 4 is provided with manholes M1 and M2 at appropriate intervals, and damming members 5 are provided upstream and downstream of the manholes M1 and M2 in the rehabilitation target range. Provide. The sewage fluid, which has been dammed, bypasses the ground from a manhole (not shown) further upstream and is discharged to the downstream pipeline in the rehabilitation target range. Further, foreign matter such as deposits and wood chips existing in the existing pipe 4 is removed, and high-pressure water cleaning is performed.

  Since the lining material 1 is a cylindrical body having flexibility, when the existing pipe 4 is rehabilitated, it can be carried into the construction site in a compact state folded in a flat shape. The lining material 1 is impregnated with a base material resin in advance in the resin impregnated layer 3.

  Specifically, in the lining material 1 shown in FIG. 1 or the lining material 1 shown in FIG. 8, the inside of the airtight layer 2 is uncured while the inside of the airtight layer 2 is decompressed and the inside of the resin impregnated layer 3 is deaerated. Inject the base resin. Thereby, the base material resin can be impregnated in the resin impregnated layer 3. The gaps between the fibers of the non-woven fabrics A and B and the reinforcing material C in the sheet-like base material 31 act as a degassing path and also act as a flow path for uncured base resin.

  Next, the lining material 1 is inserted into the existing pipe 4 while being reversed. As shown in FIG. 12, the lining material 1 is attached to the reverse insertion machine 6 installed on the ground, and fluid pressure such as compressed air or heated water is applied from the outer peripheral side (the coating layer 2 side) of the lining material 1. The lining material 1 passes through the manhole M1 and advances into the existing pipe 4 while being reversed (reversing method). Accordingly, the lining material 1 is sequentially inserted into the existing pipe 4 while turning over so that the coating layer 2 is on the inside, and the state shown in FIG. 6 or FIG. 10 is obtained.

  The inverted lining material 1 is provided with closing members at both ends, and fluid pressure such as steam is supplied to the lining material 1 to expand the diameter in the existing pipe 4. As a result, the resin impregnated layer 3 comes into close contact with the inner wall of the existing pipe 4 and the state shown in FIG. 7 or 11 is obtained.

  When the lining material 1 is heated and expanded, the entanglement between the fibers in the sheet-like substrate 31 is loosened or released by the heat applied to the lining material 1 and the heat generated by the curing reaction of the base resin. Is done. Thereby, the sheet-like base material 31 is expanded in diameter without producing wrinkles or wrinkles. Depending on the degree of the diameter expansion action, a shift occurs between the layers of the sheet-like base material 31 to allow the diameter expansion. Therefore, the sheet-like base material 31 is greatly stretched toward the outer peripheral side in contact with the inner surface of the conduit, and follows the diameter expansion of the lining material 1.

  Moreover, the joining of the overlap part 32 is loosened by heating and diameter expansion. That is, the adhesive bonding the sheet-like base material 31 is softened, so that the deformation of the overlap portion 32 is allowed while the sheet-like base material 31 is bonded.

  As a result, the diameter of the lining material 1 is sufficiently expanded, and after heating and expanding, as shown in FIG. 7 or FIG. 11, the sheet-like base material 31 is cured without causing wrinkles or wrinkles. Thereby, the lining material 1 hardens | cures in the smooth shape along the internal peripheral surface of a pipe line, and a high pressure | voltage resistant performance and appropriate intensity | strength ensuring are attained.

  The lining material 1 is integrated with the existing pipe 4 when the base material resin impregnated in the resin-impregnated layer 3 is cured to form a lining layer. This lining layer is covered with the airtight layer 2 and forms a smooth inner peripheral surface in the existing pipe 4. In the lining material 1, the resin impregnated layer 3 is formed in a substantially cylindrical shape by overlapping the end portions of the sheet-like base material 31, so that the outer diameter of the lining material 1 is formed smaller than the inner diameter of the existing pipe 4. In addition, it is possible to facilitate the insertion work into the existing pipe 4 and to expand the diameter inside the existing pipe 4.

  The lining material 1 for rehabilitating the existing pipe 4 is not limited to the one having the layer configuration exemplified in FIGS. 1 and 8, which has the airtight layer 2 in the outer layer and the resin impregnated layer 3 in the inner layer. For example, the lining material 1 may have a layer structure in which the airtight layer 2 is formed as an inner layer from the beginning and the resin impregnated layer 3 is provided outside the airtight layer 2. In this case, the lining material 1 has a laminated form in which the inner peripheral side and the outer peripheral side are in reverse order from those in FIGS. 1 and 8. If it is such a lining material 1, it will become the procedure which inserts in the existing pipe | tube 4 without reversing, and expands a diameter (formation construction method).

  The lining material 1 is in a state in which the inner peripheral surface of the lining layer (that is, the inner surface of the renovated existing pipe 4) is covered with the airtight layer 2 regardless of whether the lining material 1 is constructed by the reversal method or the forming method. The protective layer has excellent surface smoothness and high water resistance and chemical resistance.

  The sheet-like base material 31 constituting the resin-impregnated layer 3 has a multilayer structure including reinforcing fibers, and can ensure high strength. In addition, since the laminate of nonwoven fabric A / reinforcing material C / nonwoven fabric B is entangled, even if it is shaped into a substantially cylindrical shape or inserted reversely, it can be displaced or twisted between layers. The occurrence of wrinkles and wrinkles on the inner circumference side can be suppressed. Further, the sheet-like base material 31 is entangled with the laminate, so that the nonwoven fabrics A and B on both sides sandwiching the reinforcing material C protect the reinforcing material C, and the fibers of these nonwoven fabrics A and B are entangled with each other. It is possible to improve the bonding and to bond well.

  In the lining material 1, the sheet-like base material 31 included in the resin impregnated layer 3 can be made excellent in integrity and surface smoothness. As a result, the lining material 1 maintains an arrangement form of the multi-layered structure until it reaches the time of manufacturing, carrying-in work, inserting work into the existing pipe 4, turning over, and heating and expanding the diameter. A high-strength lining layer having a uniform thickness is formed without wrinkles.

(Second embodiment)
The lining material of 2nd embodiment is demonstrated referring FIG.13 and FIG.14. FIG. 13 is a sectional view showing the lining material of the second embodiment 2, and FIG. 14 is a sectional view showing a modification of the lining material of the second embodiment. 13 and 14 show the lining material 1 in a state where it is disposed in an existing pipe, that is, in a state where the airtight layer 2 is disposed on the inner peripheral side and the resin impregnated layer 3 is disposed on the outer peripheral side.

  The lining material 1 of the second to fourth embodiments described below is characterized by the configuration of the lining material 1 of the first embodiment, the form of the resin impregnated layer 3 and the sheet-like base material 31. Other basic configurations are common. Therefore, in the following description, the characteristic configurations of the resin-impregnated layer 3 and the sheet-like base material 31 will be described in detail, and the description of the other configurations common to the first embodiment will be omitted by using common reference numerals.

  In the lining material 1 of the second embodiment, the overlap portions 32 of the plurality of sheet-like base materials 31 of the resin impregnated layer 3 are provided with their positions shifted in the circumferential direction between the inner peripheral side and the outer peripheral side. In the form shown in FIG. 13, the sheet-like base material 31 on the inner peripheral side is rounded with the surface of the nonwoven fabric A facing the outer peripheral side, and ends in the width direction are overlapped to form an overlap portion 32, which is substantially cylindrical. It is made into a shape. Moreover, the sheet-like base material 31 on the outer peripheral side is rounded with the surface of the non-woven fabric A facing the inner peripheral side, and overlaps the end portions in the width direction to constitute the overlap portion 32, which is substantially cylindrical. Yes. And these overlap parts 32 are provided in the position which the circumferential direction opposes by the inner peripheral side and the outer peripheral side. The width dimension of each sheet-like base material 31 is longer than the inner peripheral length of the existing pipe 4.

  In the form shown in FIG. 14, the resin-impregnated layer 3 is configured by arranging a plurality of sets of sheet-like base materials 31 stacked in a substantially cylindrical shape. That is, the resin-impregnated layer 3 is formed in a substantially cylindrical shape by arranging two sheet-like base materials 31 in a state of being laminated so that the surfaces of the nonwoven fabric A face each other in a circumferential direction by half a circumference. ing. Thereby, the resin impregnated layer 3 has a configuration in which two sets of the two sheet-like base materials 31 are arranged in the circumferential direction.

  A pair of sheet-like base materials 31 and 31 are arranged to overlap with another set of adjacent sheet-like base materials 31 and 31 adjacent to each other at a width direction, and overlap in the circumferential direction. It is formed in a substantially cylindrical shape.

  As shown in FIG. 14, the two overlap portions 32 in the circumferential direction are provided so as to face each other. As a result, the reinforcing material C is evenly disposed on the upper side and the lower side of the lining material 1, and the reinforcing material C is evenly disposed on the left and right sides, which is sufficient for the vertical load acting on the existing pipe 4. It becomes possible to exhibit a sufficient proof stress. In addition, the overlap part 32 of the sheet-like base material 31 may be arrange | positioned at the side part on either side with respect to the cross section of the existing pipe 4. FIG.

  With this configuration, the thickness of the resin impregnated layer 3 can be formed more uniformly. Further, the overlapping of the sheet-like base materials 31 makes it possible to easily maintain a substantially cylindrical shape when the lining material 1 is transported or inserted into and retracted into the pipeline. When the lining material 1 is heated or expanded in diameter, the overlap portions 32 of the sheet-like base material 31 are separated from each other and follow the expanded diameter of the lining material 1. Therefore, the diameter of the lining material 1 is sufficiently expanded and comes into close contact with the inner peripheral surface of the existing pipe 4.

(Third embodiment)
The lining material of 3rd embodiment is demonstrated referring FIGS. 15-18. FIG. 15 is a cross-sectional view schematically showing the configuration of the resin-impregnated layer of the lining material of the third embodiment, and FIG. 16 is a cross-sectional view showing a modification of the resin-impregnated layer. FIG. 17 is an explanatory view showing needle punching of a sheet-like substrate, and FIG. 18 is an explanatory view showing an example of a needle used for the needle punching.

  As shown in FIG. 15, the resin-impregnated layer 3 in the lining material 1 may be configured such that a layer made of a nonwoven fabric 30 is interposed between a plurality of sheet-like base materials 31. That is, in this case, the sheet-like base material 31 disposed on the inner peripheral side of the resin-impregnated layer 3 has the surface of the nonwoven fabric B facing the outer peripheral side, and the sheet-like base material 31 disposed on the outer peripheral side is the nonwoven fabric B. The non-woven fabric 30 having a predetermined thickness is arranged between the non-woven fabrics B of the sheet-like base material 31 with the surface facing the inner peripheral side. The thickness of the non-woven fabric A constituting each sheet-like base material 31 is larger than the thickness of the non-woven fabric B.

  The nonwoven fabric 30 may be a single sheet or a laminate of a plurality of sheets. Moreover, when the nonwoven fabric 30 is comprised by laminating | stacking two or more sheets, even if it only laminates | stacks several nonwoven fabrics, the thing in which several nonwoven fabrics were mechanically intertwined may be sufficient.

  As shown in FIG. 16, the sheet-like base material 31 has a configuration in which the reinforcing material C is interposed between the nonwoven fabric A and the nonwoven fabric B having a thickness substantially equal to that of the nonwoven fabric A and is intertwined and integrated. Also good. In this case, the nonwoven fabric 30 is disposed between the sheet-like base material 31 disposed on the inner peripheral side of the resin-impregnated layer 3 and the sheet-like base material 31 disposed on the outer peripheral side.

  Even in the resin-impregnated layer 3 according to any form, the total thickness of the nonwoven fabric B, the nonwoven fabric 30, and the nonwoven fabric B positioned between the two reinforcing materials C is the same as that of the nonwoven fabric A positioned on the innermost side and the outermost periphery. It forms so that it may become thicker than the total thickness with the nonwoven fabric A located in the side. Thereby, while being able to ensure the desired thickness in the lining material 1, the intensity | strength by the reinforcing material C can be ensured. Further, since the reinforcing material C is covered and protected by the non-woven fabric A and the non-woven fabric B, it is possible to prevent misalignment of the oriented reinforcing material C and to enhance the handleability without exposing the reinforcing fibers.

  15 and 16, each sheet-like base material 31 is integrated by entangled a laminated body of the nonwoven fabric A, the reinforcing material C, and the nonwoven fabric B with a needle punch.

  In the form shown in FIG. 15, the sheet-like substrate 31 is disposed on the resin-impregnated layer 3 so that the surface of the nonwoven fabric B faces the surface of the nonwoven fabric B of the other sheet-like substrate 31. In this case, as shown in FIG. 17, each sheet-like base material 31 is needle punched from the nonwoven fabric B side by passing a plurality of needles 8 in the stacking direction of the laminate.

  As shown in FIG. 18, the needle 8 preferably has a sharp needle tip portion 81, a blade portion 82 in which a plurality of barbs 85 having a triangular cross section are formed, and a base portion 84. The barb 85 for hooking fibers has undercut openings formed in a plurality of directions. The opening of the barb 85 is formed in a triangular cross section having a parallel surface substantially parallel to the laminate on the distal end side near the needle tip portion 81 and an inclined surface on the base portion 84 side. Thereby, even in the case of needle punching from the nonwoven fabric B side, it is possible to suitably entangle the fibers on the thick nonwoven fabric A side with the fibers on the thin nonwoven fabric B side, and to integrate the layers well. Can do.

  The configuration of the needle 8 is not limited to that illustrated in FIG. 18, and may be any configuration as long as fiber entanglement from the thick nonwoven fabric A to the thin nonwoven fabric B is possible.

  With this configuration, the layers of the sheet-like base material 31 can be satisfactorily entangled and integrally bonded, and the interface between the layers can be less likely to be displaced or twisted. In addition, the fiber density can be increased without impairing the impregnation property of the base material resin. In addition, since the entanglement between the fibers of the nonwoven fabric A and the nonwoven fabric B can be increased, the number of needles driven can be reduced.

  In the form of FIG. 16, the sheet-like base material 31 may be subjected to needle punching from either the nonwoven fabric A or the nonwoven fabric B side.

(Fourth embodiment)
The lining material of 4th embodiment is demonstrated referring FIG.19 and FIG.20. FIG. 19 is a cross-sectional view showing a lining material according to the fourth embodiment of the present invention, and FIG. 20 is a cross-sectional view showing a modification of the lining material of the fourth embodiment. 19 and 20 show the lining material 1 in a state where it is disposed in an existing pipe, that is, in a state where the airtight layer 2 is disposed on the inner peripheral side and the resin impregnated layer 3 is disposed on the outer peripheral side.

  As shown in FIGS. 19 and 20, the resin-impregnated layer 3 of the lining material 1 has two sheet-like base materials 31 arranged on the inner peripheral side in a substantially cylindrical shape with the end portions in the width direction overlapped with each other. Has been. That is, the two sheet-like base materials 31 on the inner peripheral side are arranged in the circumferential direction by half a circumference, and are formed in a substantially cylindrical shape by overlapping both ends. Further, on the outer peripheral side, two sheet-like base materials 31 are arranged in a substantially cylindrical shape so that the surface of the nonwoven fabric A faces the inner peripheral side and the end portions in the width direction overlap each other. The two sheet-like base materials 31 on the outer peripheral side are also arranged in the circumferential direction by a half circumference, and are made substantially cylindrical by overlapping both ends.

  Thereby, the sheet-like base material 31 arranged on the inner peripheral side has the surface of the nonwoven fabric A directed to the outer peripheral side, and the sheet-like base material 31 arranged on the outer peripheral side has the surface of the nonwoven fabric A on the inner peripheral side. The non-woven fabric A of the sheet-like base material 31 that is directed is arranged so as to face each other inside and outside.

  In the form shown in FIG. 19, the overlap portion 32 of the sheet-like base material 31 is disposed with a position shifted in the circumferential direction between the outer peripheral side and the inner peripheral side. Moreover, in the form shown in FIG. 20, the overlap part 32 of the sheet-like base material 31 arrange | positioned at the inner peripheral side and the overlap part 32 of the sheet-like base material 31 arrange | positioned at the outer peripheral side are equal to the circumferential direction. It is arranged.

  The lining material 1 having such a configuration can suppress the thickness of the overlap portion 32 and can form the thickness of the resin impregnated layer 3 more uniformly than the configuration of the first embodiment. Thereby, it becomes possible to form a high-strength lining layer having excellent surface smoothness and a desired thickness.

  In the lining material 1 of the fourth embodiment, the number of the sheet-like base materials 31 disposed on the inner peripheral side and the outer peripheral side is not limited to two, and a configuration in which a plurality of three or more are disposed. There may be.

  The lining material 1 configured as described above has elasticity, flexibility, and flexibility that can follow the shape of the inner peripheral surface of the existing pipe 4 in any of the above embodiments. Furthermore, since the outer diameter of the lining material 1 can be formed with a smaller diameter than the inner diameter of the existing pipe 4, insertion into the existing pipe 4 is facilitated. Further, the lining material 1 has a multilayer structure including the reinforcing material C, and can have both sufficient strength and diameter expandability.

  In particular, the sheet-like base material 31 constituting the resin-impregnated layer 3 of the lining material 1 has a multilayer structure because the fibers of the nonwoven fabric A and the nonwoven fabric B are well entangled by mechanical entanglement processing. Nevertheless, it is difficult to cause displacement or twisting between layers before and after inversion, and the base material resin can be sufficiently impregnated while maintaining a uniform laminated form. Thereby, when the lining material 1 is arrange | positioned in the existing pipe 4, it is prevented that an unnecessary wrinkle and wrinkle arise on the inner peripheral side. Accordingly, the shape of the lining material 1 can be made to follow the irregularities and steps on the inner peripheral surface of the existing pipe 4, and a lining layer having high pressure resistance and strength can be obtained without producing an unimpregnated portion of the base resin. It becomes possible to form.

  As a joining means of the overlap part 32, it is not limited to a thing containing said thermoplastic resin material, The joining means which does not contain a thermoplastic resin material may be sufficient. For example, the overlap portion 32 is joined by sewing with a general suture such as raw silk, or joined by a surface fastener, a double-sided tape, an adhesive tape, thermal welding, or other joining means. It may be.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited by these examples.

Example 1
The lining material shown in FIG. 21 was produced. As the resin impregnated layer 3, one piece of felt having a basis weight of 840 g / m ² , a thickness of about 4 mm, a length of about 10 m, and a width of 1000 mm was used. The cylindrical member 22 constituting the airtight layer 2 has a thickness of about 0. 0 on the outer peripheral surface of a polyester woven fabric having a peripheral length of 860 mm, a thickness of about 0.8 mm, and a length of about 10 m. A 6 mm resin film 21 joined by heating and pressure bonding was used.
As the resin film 21 covering the outer peripheral surface of the cylindrical member, linear low density polyethylene LLDPE (model number SP4530, manufactured by Prime Polymer Co., Ltd.) polymerized using the metallocene catalyst shown in Table 1 was used. This LLDPE is a copolymer of ethylene and α-olefin (1-hexene).

  The ends in the width direction of the felt were overlapped by 60 mm, and the overlapped portions were bonded by hot melt. Next, the felt was inserted into the inner surface of the tubular fabric to obtain a lining substrate. Next, an uncured thermosetting resin was impregnated into the felt constituting the lining substrate having an extension of 10 m to obtain a lining material.

[Reverse pressure test]
The produced lining substrate having an extension of 10 m was wound around a reversing machine, and the maximum reversal pressure until the full length was reversed was measured. It shows that slipperiness is so high that this measured value is low. The results are shown in Table 1.

[Ground followability test]
The lining material was installed in the test pipeline by reversal insertion, and the diameter of the lining material was increased by fluid pressure, followed by further thermosetting, thereby renewing the test pipeline 4 as shown in FIG. Next, after applying a displacement of “axial strain 1.5%” and “0.4 ° bending angle” simulating the ground displacement to the joint 4a of the test pipe 4, the inner diameter gradually increases. Water pressure was applied to the rehabilitation tube, and the maximum water pressure when the rehabilitation tube burst was measured. The higher the measured value, the higher the pressure resistance and the followability to the ground displacement. The results are shown in Table 1.

[Elution test]
Measurement of cyanide ion, cyanide chloride, phenols, epichlorohydrin, N, N-dimethylaniline and styrene based on Japan Water Works Association Standard JWWA K149: 2004 “FRP lining material for water tank concrete tank inner surface” 5.2.4h) did. Among the results, the phenols and styrene in which a difference was found between the examples and the comparative examples are listed in Table 1. Regarding cyanide ion, cyan chloride, epichlorohydrin, and N, N-dimethylaniline, there was no significant difference between Examples and Comparative Examples.

(Comparative Examples 1-3)
The test was performed in the same manner as in Example 1 by changing the resin type of the resin film. The results are also shown in Table 1. In Comparative Example 3, a two-layer resin film having low density polyethylene LDPE as the outer layer and LLDPE as the inner layer was used.

(Example 2)
The thickness of the resin film was changed and the same test as in Example 1 was performed. The results are also shown in Table 1. In Example 2, a resin film thinner than Example 1 was used.

  From the results of Examples 1 and 2 and Comparative Examples 1 to 3, Examples 1 and 2 using a resin film made of LLDPE polymerized using a metallocene catalyst have a low maximum reversal pressure, and blocking is suppressed. It is clear that the pressure resistance and the followability with respect to the ground displacement are high, and there are few elution components. On the other hand, Comparative Examples 1-3 were inferior to Example 1 in the maximum inversion pressure, pressure resistance, followability to ground displacement, and elution.

  The configurations and combinations thereof in the embodiments described above are examples, and the addition, omission, replacement, and other modifications of the configurations can be made without departing from the spirit of the present invention. Further, the present invention is not limited by each embodiment, and is limited only by the scope of the claims.

  The lining substrate and the lining material according to the present invention are widely applicable in the field of repairing the inner surface of an existing pipe.

  DESCRIPTION OF SYMBOLS 1 ... Lining material, 2 ... Airtight layer, 21 ... Resin film, 22 ... Cylindrical member, 3 ... Resin impregnation layer, 30 ... Nonwoven fabric, 31 ... Sheet-like base material, 32 ... Overlap part, A ... Nonwoven fabric, B ... Nonwoven fabric, C ... reinforcing material, 4 ... existing pipe, 4a ... joining part, 5 ... damming member, 6 ... reversing insertion machine, 8 ... needle, 81 ... needle tip part, 82 ... blade part, 83,85 ... barb

Claims (5)

A lining material in which a laminate including a resin-impregnated layer having a sheet-like base material impregnated with an uncured resin and an airtight layer covering one surface of the resin-impregnated layer is formed into a cylindrical shape,
The lining characterized in that the hermetic layer has a resin film made of polyethylene or ethylene / α-olefin copolymer obtained by polymerizing ethylene or ethylene and α-olefin having 3 or more carbon atoms using a metallocene catalyst. Wood.   The airtight layer includes a cylindrical member and the resin film covering the first surface of the cylindrical member, and the second surface of the cylindrical member faces one surface of the resin-impregnated layer. The lining material according to claim 1. The lining material according to claim 2, wherein a relationship between a thickness t ₁ of the cylindrical member and a thickness t ₂ of the resin film is 2t ₂ ≧ t ₁ .   4. The sheet-like base material according to any one of claims 1 to 3, wherein a sandwich structure laminated in the order of nonwoven fabric / reinforcing fiber material / nonwoven fabric is entangled by mechanical entanglement processing. The lining material according to claim 1.   A lining substrate, wherein the resin-impregnated layer constituting the lining material according to claim 1 is not impregnated with the uncured resin.

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