JP2018030280A - Method for regenerating pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regenerating an existing pipeline which can shorten a construction time required for regeneration of a pipeline and has high versatility.SOLUTION: A method for regenerating a pipeline includes an introduction step and a curing step. The introduction step introduces a lining material containing a fiber base material impregnated with a thermosetting resin composition into the inside of an existing pipeline. The curing step brings a heat medium into contact with the inner surface of the lining material in a state of pressing the lining material against the inner wall of the existing pipeline to cure the thermosetting resin composition, and forms a regenerated pipeline. The curing step increases a temperature of the lining material to a reaction start temperature of a reaction initiator or higher and lower than a boiling point of a reactive diluent, in an initial stage. The reactive diluent is contained in the thermosetting resin composition, and a boiling point of the reactive diluent is 180°C or higher.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for rehabilitating existing pipes such as sewer pipes, water pipes, industrial water pipes, and agricultural water pipes. More specifically, the present invention relates to a method for rehabilitating a pipeline using a lining material.

There is a known rehabilitation method in which, when existing pipes such as sewer pipes, water pipes, industrial water pipes, and agricultural water pipes buried in the ground become obsolete, the inner surface of the pipe line is repaired by lining.
As some examples of the rehabilitation method, JP2003-49974A (Patent Document 1), JP2003-181924A (Patent Document 2), JP2003-165158A (Patent Document 3), and As described in Japanese Unexamined Patent Application Publication No. 2013-252646 (Patent Document 4), fluid pressure is applied to the inside of a tubular lining material arranged in a pipeline to press the lining material against the inner peripheral surface of the pipeline, A method of forming a lining layer by curing and integration is known.

JP 2003-49974 A JP 2003-181924 A JP 2003-165158 A JP 2013-252646 A

  For example, when construction is performed on an existing pipe buried under a main road, road restriction time is severely limited, and it is required to shorten the construction time. Examples of the rehabilitation method using a lining material include a thermosetting method and a photocuring method according to the type of resin impregnated in the lining material. In the thermosetting method, it is common knowledge to heat and cure over time in order to obtain a cured product having desired mechanical properties. For this reason, there is a problem in that construction takes time. In addition, although the photo-curing method can be cured for a short time, it requires a special product such as a UV irradiator as construction equipment.

  In view of the above problems, an object of the present invention is to provide an existing pipe rehabilitation method that can reduce the construction time required for rehabilitating pipe lines and is highly versatile.

  In order to achieve the above object, the present invention includes the following inventions.

(1)
The method for rehabilitating a pipeline according to the present invention includes an introduction step and a curing step. In the introducing step, a lining material including a fiber base material impregnated with the thermosetting resin composition is introduced into the existing pipeline. In the curing step, a heat medium is brought into contact with the inner surface of the lining material to cure the thermosetting resin composition, thereby forming a rehabilitation tube. Further, the thermosetting resin composition contains a reaction initiator and a reactive diluent having a boiling point of 180 ° C. or higher. Further, at the initial stage of the curing process, the lining material is heated to a temperature not lower than the reaction start temperature of the reaction initiator and lower than the boiling point of the reactive diluent.

Thus, the construction time concerning the rehabilitation of a pipe line can be shortened, ensuring high versatility by performing a thermosetting type construction method. Since the reactive diluent contained in the lining material does not boil in the curing step, a rehabilitated tube having excellent mechanical properties can be obtained. The boiling point of the reactive diluent refers to the boiling point in a 1 atm environment.
The initial stage of the curing process is a stage where heating is performed at a temperature lower than the reaction start temperature of the reaction initiator in the conventional thermosetting method, for example, within 20 minutes from the time when the heat medium is introduced into the lining material. The relatively early stage. In this specification, heating and curing so that the lining material is heated to a temperature higher than the reaction start temperature of the reaction initiator in the initial stage of the curing process may be referred to as “immediate heat curing”. The reaction start temperature is a temperature at which the reaction initiator is decomposed to generate radicals.

(2)
In the method of rehabilitating the pipe of (1) above, the reactive diluent is selected from a (meth) acrylic ester crosslinking agent, a fumarate ester crosslinking agent, a maleate ester crosslinking agent, and a diallyl phthalate crosslinking agent. May be selected from the group consisting of

  Thereby, the rehabilitation pipe | tube excellent in the mechanical characteristic can be obtained easily.

(3)
In the method for rehabilitating the pipe line (1) or (2), the initial stage may be within 20 minutes from the time when the heat medium is introduced into the lining material.

  Thereby, the time required for rehabilitation of the pipeline can be further shortened.

(4)
In the method for rehabilitating a pipe line of any one of (1) to (3) above, the time required for the curing step may be 3 hours or less.

  Thereby, the time required for rehabilitation of the pipeline can be further shortened.

(5)
In the method for rehabilitating a pipe line according to any one of (1) to (4) above, the thermosetting resin composition may contain a vinyl ester resin as the thermosetting resin.

  As a result, it is possible to easily prevent undesired lowering of the viscosity of the resin composition and to improve the chemical resistance.

(6)
The method for rehabilitating a pipe line according to any one of the above (1) to (5) includes a reinforcing fiber layer in which a fiber base material is oriented in the circumferential direction of an existing pipe line and an axial direction of the existing pipe line. And a layer of.

  Thereby, shrinkage after curing can be prevented satisfactorily.

It is a schematic diagram explaining the rehabilitation method of the pipe line of this invention. It is typical sectional drawing of an example of the lining material used for the rehabilitation method of a pipe line. It is typical sectional drawing of the renovated pipe line obtained by implementing the rehabilitation method of a pipe line using the lining material of FIG. It is an enlarged view of the square enclosure part in FIG.

[1. Rehabilitation method of pipeline]
In FIG. 1, the schematic diagram explaining the rehabilitation method of the pipe line of this invention is shown. FIG. 2 shows a schematic cross-sectional view of an example of a lining material used in a pipeline rehabilitation method. FIG. 3 shows a rehabilitation obtained by carrying out a pipeline rehabilitation method using the lining material of FIG. A schematic cross-sectional view of a pipe line (that is, a lining material formed as a rehabilitation pipe) is shown.

  The existing pipe line 900 to be constructed by the pipe line rehabilitation method of the present invention is a buried pipe such as a sewer pipe, a water pipe, an industrial water pipe, and an agricultural water pipe. In the existing pipe line 900, the inner surface of the metal pipe 910 is covered with a mortar lining 920. When deterioration of the metal pipe 910 and / or deterioration of the mortar lining 920 or water leakage is detected by non-destructive inspection in the pipe, the inner peripheral surface of the existing pipeline 900 is covered with a lining material. Can do. By using the lining material 100 as the reinforcing fiber base impregnated with the curable resin composition, it is possible to provide high flatness resistance against external pressure such as earth covering and wheel load of the rehabilitated pipe 800 after rehabilitation.

  The construction method using the lining material 100 includes an introduction process and a curing process. Furthermore, prior to the introduction process, the existing pipeline 900 may be cleaned and the status in the existing pipeline 900 may be confirmed using an in-tube camera.

  In the introduction process, the lining material 100 is introduced into the existing pipe line 900. The lining material 100 may be introduced by a pulling method or a reversing method.

  In the case of the pull-in method, after the lead rope is drawn into the existing pipe line 900 in advance as shown in FIG. 1A, the lining material 100 is attached to the existing pipe line 900 using a winch as shown in FIG. Can be pulled in. At this time, the slip sheet 700 (see FIG. 3) is also drawn into the existing pipe line 900, so that the pulling load of the lining material 100 can be reduced and the lining material 100 can be protected from the friction during the pulling.

  In the case of the reversal method, a reversing machine or the like is used to enclose a fluid in the lining material 100 whose front and back have been reversed in advance, and the lining material 100 is reversed and introduced into the existing pipe line 900 by fluid pressure.

  In the curing step, the lining material 100 is cured. In the present invention, the starting point of the curing step is a point in time when a heat medium described later is first brought into contact with the lining material 100. In the curing step, as shown in FIG. 1C, the lining material 100 is cured in a state where the lining material 100 is pressed against the inner wall of the existing conduit 900 and expanded in a tubular shape.

The timing for expanding the diameter of the lining material 100 is not particularly limited.
For example, prior to the curing step, both ends of the lining material 100 are closed with pipe end plugs, and compressed gas or high-pressure liquid is fed into the lining material 100 from one of the pipe end plugs through a vent pipe or liquid passage pipe. The diameter of the lining material 100 may be expanded by pressing. In this case, in the subsequent curing step, a heat medium (such as water vapor) for heating the lining material 100 can be fed at a high pressure.
Alternatively, the diameter of the lining material 100 may be directly expanded by a heat medium (such as water vapor) used in the curing step. In this case, both ends of the lining material 100 are closed with tube end plugs, and in the curing process, a heat medium for heating the lining material 100 is fed into the lining material 100 from one of the tube end plugs at a high pressure. By pressing, heating of the lining material 100 can be started together with the diameter expansion of the lining material 100.

  In this invention, it heats up so that the temperature of the lining material 100 may become more than the reaction start temperature of the reaction initiator contained in a thermosetting resin composition in the initial stage of a hardening process. The timing at which the temperature of the lining material 100 becomes equal to or higher than the reaction start temperature may be, for example, within 20 minutes, preferably within 10 minutes, and more preferably within 5 minutes from the time when the heat medium is introduced into the lining material 100. Thus, in order to increase the temperature of the lining material 100 at the initial stage of the curing process, it is necessary to raise the temperature of the lining material 100 from the beginning in the introduction of the heat medium (the temperature of the lining material 100 is higher than the reaction start temperature of the reaction initiator). A heat medium having a desired temperature rise may be introduced after the heat medium having a temperature lower than the target temperature is first introduced. From the viewpoint of shortening the construction time, it is preferable to introduce a heat medium having a target temperature to be raised from the beginning.

  In addition, since the temperature more than the reaction start temperature of a reaction initiator changes with reaction initiators, it is not limited. From the viewpoint of shortening the construction time, a temperature higher than the reaction start temperature, for example, a temperature higher by 5 ° C. or more than the reaction start temperature is preferable. As an example, the temperature of the lining material 100 can be raised to 95 ° C. or higher in the initial stage of the curing process. The upper limit within the temperature range of the lining material 100 is the boiling point of the reactive diluent from the viewpoint of preventing the reactive diluent contained in the thermosetting resin composition from boiling and obtaining a rehabilitation tube having excellent mechanical properties. The temperature is preferably lower than the boiling point of the reactive diluent by 60 ° C. or less.

The time required for the curing step (the time required from the time when the heat medium is introduced into the lining material 100 to the end of curing) may be, for example, 3 hours or less, preferably 2 hours or less. Thus, in the present invention, since the time required for curing is short, the time required for the entire construction can be shortened.
After the curing is completed, the rehabilitation pipe 800 is cooled while maintaining the pressed state, as shown in FIG.

  After the curing step, as shown in FIG. 1 (e), as a post treatment, the tube end of the rehabilitated tube 800 may be cut and the cut tube end may be subjected to a water stop treatment. The pipe reinforcement structure after rehabilitation obtained in this manner is excellent in fire resistance, strength, resistance to external pressure, water resistance, and rust prevention, in combination with the existing pipe line 900.

[2. Lining material]
Hereinafter, the example of the lining material suitable for the pipeline rehabilitation method of the present invention will be described in detail. FIG. 4 shows an enlarged view of a square box portion in FIG. 2 in order to explain the layer structure of an example of the existing lining material for pipeline rehabilitation shown in FIG. 2 in more detail.

[2-1. Basic configuration]
As shown in FIG. 2, the lining material 100 is formed in a tubular shape having a closed cross section. In FIG. 2, the lining material 100 is shown in a cross-sectional circle for convenience of explanation. However, the lining material 100 has flexibility in a state where a curable resin composition (described later) as a constituent element is uncured. When stored or introduced into existing piping, it is usually crushed so as to reduce its bulk.
As shown in FIG. 2, the lining material 100 according to the present embodiment includes a reinforcing layer 210, and an inner layer 220 and a water blocking layer 230 that are laminated on both surfaces thereof.

[2-2. Reinforcing layer]
The reinforcing layer 210 includes at least a fiber substrate including a reinforcing fiber substrate and a curable resin composition impregnated therein.

[2-2-1. Fiber substrate]
The reinforcing layer 210 is a fiber reinforced resin layer including at least a reinforcing fiber substrate. As shown in FIG. 2, the reinforcing layer 210 of the present embodiment includes a fiber reinforced resin layer 211 including a reinforced fiber base material, and a resin absorbent layer 212 including two resin absorbent base materials stacked on both sides of the fiber reinforced resin layer 211. Including. The resin absorption layer 212 is not an essential configuration.

(Reinforced fiber substrate)
The reinforcing fiber base material constituting the fiber reinforced resin layer 211 is a high-strength fiber base material. If the reinforcing fiber base material has high strength, the fibers constituting it may have orientation or non-orientation. The reinforcing fiber substrate of this embodiment is composed of a reinforcing fiber layer having orientation (a laminate of fiber reinforcing layers 211CD and 211AD in this embodiment) and a resin absorbing layer 212 having no orientation, It has a sandwich structure in which a resin absorption layer 212 is laminated between reinforcing fiber layers. As a result, a lightweight lining material is obtained while ensuring rigidity and thickness that can withstand external pressure.

  In the present invention, it is preferable that the reinforcing fiber substrate includes a layer having orientation in terms of obtaining the strength of the reinforcing layer 210. The orientation direction may be a direction along the circumferential surface of the tubular lining material 100. Thereby, when the lining material 100 is formed as the rehabilitation pipe | tube 800 (refer FIG. 3), the fiber which comprises a reinforced fiber base material orientates in the direction along the surrounding surface of the rehabilitation pipe | tube 800. FIG. When the component in the direction along the circumferential surface includes the circumferential direction, it is possible to obtain resistance to the covering direction stress and the flat direction stress against the wheel load. In the case where the axial direction is included in the component in the direction along the peripheral surface, resistance to a pulling load (only in the case of the pulling method) and resistance to shrinkage after curing can be obtained.

  More specifically, the reinforcing fiber base material in the fiber reinforced resin layer 211 may include at least fibers oriented in the circumferential direction. Thereby, the tolerance with respect to the stress in the flat direction against the earth covering and the wheel load is efficiently obtained. The reinforcing fiber base material may include fibers oriented in the axial direction in addition to fibers oriented in the circumferential direction. Thereby, the resistance to the pulling load (only in the case of the pulling method) and the resistance to shrinkage after curing are efficiently obtained.

  In this embodiment, the reinforcing fiber base material of the fiber reinforced resin layer 211 includes a laminate of reinforcing fiber base materials that are oriented in different directions (for example, the circumferential direction and the axial direction). Specifically, what is oriented in the circumferential direction is the reinforcing fiber layer 211CD, and what is oriented in the axial direction is the reinforcing fiber layer 211AD. In this way, by configuring the reinforcing fiber base in the fiber reinforced resin layer 211 to include reinforcing fiber bases that are oriented in different directions, resistance to flat covering stress and ring direction load (and pull-in method) In this case, not only the resistance to the pulling load) can be obtained well, but also the post-curing shrinkage can be easily suppressed against the immediate heat curing. In addition, since the stacking order of the reinforcing fiber bases that are oriented in different directions is not particularly limited, the stacking order is reversed between the reinforcing fiber layer 211CD oriented in the circumferential direction and the reinforcing fiber layer 211AD oriented in the axial direction. May be.

  When the reinforcing fiber substrate in the fiber reinforced resin layer 211 includes fibers having orientation as in the present embodiment, the specific form of the fibers having orientation is not particularly limited. For example, a form in which continuous fibers are aligned in one direction and held by a weft auxiliary yarn (unidirection), a form in which a continuous fiber is used as a woven fabric (cross), and a plurality of fiber sheets in which the directions of fibers are aligned in one direction And the like (non-clip fabric) in which the fibers are stitched with the auxiliary yarns so that the directions of the fibers are different.

  Examples of the material of the reinforcing fiber substrate in the fiber reinforced resin layer 211 include carbon fibers such as PAN (polyacrylonitrile) -based carbon fibers and pitch-based carbon fibers, inorganic fibers such as metal fibers, glass fibers, ceramic fibers, and boron fibers. It is done. These fibers may be used alone or in combination. Among these fibers, glass fibers are preferable in view of the strength and cost of the obtained fiber-reinforced resin molded product. In order to enhance the adhesion to the base resin, the fiber is preferably treated with a silane coupling agent such as an aminosilane surface treatment agent, an epoxysilane surface treatment agent, or an acrylic silane surface treatment agent.

  The average fiber diameter of the fibers constituting the reinforcing fiber substrate may be, for example, 10 μm or more and 40 μm or less, preferably 15 μm or more and 30 μm or less. It is preferable from an elastic viewpoint that an average fiber diameter is more than the said lower limit, and it is preferable from the point of tensile strength that it is below the said upper limit. The average fiber diameter is an average value of the maximum diameters of the plurality of fibers.

(Resin absorption base material)
The resin-absorbing base material in the resin-absorbing layer 212 is provided from the viewpoint of securing a thickness to provide external pressure strength and / or from the viewpoint of securing a resin-rich layer than the fiber-reinforced resin layer 211. The resin-absorbing base material in the absorption layer 212 does not need the strength as the reinforcing fiber base material in the fiber-reinforced resin layer 211. That is, the resin-absorbing base material in the resin-absorbing layer 212 may have a lower strength than the reinforcing fiber base material in the fiber-reinforced resin layer 211.

  The nonwoven fabric should just be a fiber base material comprised by a non-orientation (random orientation) fiber. As a specific form, it may be a porous body having flexibility and a large specific surface area, and may be composed of felt, mat, spunbond, or web containing continuous filaments or staple fibers. In addition, the strand is cut into a certain length, dispersed in a mat shape, and then uniformly applied with an adhesive such as a thermoplastic resin and thermally melted, and the strands are bonded together to form a chopped strand. A mat is preferred.

  Examples of the material of the resin-absorbing substrate in the resin-absorbing layer 212 include glass fiber, metal fiber, polyester (for example, polyethylene terephthalate), polyolefin (for example, polyethylene, high-strength polypropylene), polyamide (for example, nylon, aramid), vinylon, polyacetal, Synthetic organic fibers such as paraphenylene benzoxazole; natural fibers such as kenaf and hemp. These fibers may be used alone or in combination.

  Since the resin-absorbing substrate in the resin-absorbing layer 212 is composed of non-oriented fibers, the fibers of the resin-absorbing substrate in the resin-absorbing layer 212 are entangled with the fibers of the reinforcing-fiber substrate in the fiber-reinforced resin layer 211. Thus, the fiber reinforced resin layer 211 can be integrated. Furthermore, when the reinforced fiber base material in the fiber reinforced resin layer 211 has orientation, the orientation can be maintained and the disorder of the orientation can be prevented by integrating in this way.

  The basis weight of the resin-absorbing substrate in the resin-absorbing layer 212 is made smaller than the basis weight of the reinforcing-fiber substrate in the fiber-reinforced resin layer 211 (a laminate of a plurality of reinforcing fiber substrates in the fiber-reinforced resin layer 211 as in this embodiment) In the case of a body, it can be made smaller than the basis weight of any constituent layer). As a result, the resin absorption layer 212 outside the fiber reinforced resin layer 211 is more resin-rich than the fiber reinforced resin layer 211, and surface smoothness can be easily obtained, and the resin absorption that is the core layer of the fiber reinforced resin layer 211. In the layer 212, the thickness can be efficiently ensured.

[2-2-2. Curable resin composition]
The curable resin composition that is the base material of the reinforcing layer 210 includes at least a reaction initiator and a reactive diluent in the thermosetting resin that is the skeleton resin. Further, the curable resin composition may include a non-reactive diluent and other additives.

  The components constituting the curable resin composition (thermosetting resin, reactive diluent, non-reactive diluent, and additive described later) preferably have a boiling point at 1 atm of 180 ° C. or higher. This makes it possible to obtain a rehabilitated tube excellent in mechanical properties by preventing boiling of the components of the curable resin composition even when subjected to immediate heat curing conditions.

  The components constituting the curable resin composition do not include any component having a boiling point of less than 180 ° C. at 1 atm (0% by weight), or even if included, the total is 0% by weight. It is preferably more than 1% by weight, preferably more than 0% by weight and 0.5% by weight or less. As a result, a rehabilitated tube having excellent mechanical properties can be easily obtained even under immediate heat curing conditions.

  Various solvents (especially organic solvents) may be mentioned as the components having a boiling point of less than 180 ° C. at 1 atm. In addition, components such as a low boiling point monomer (especially a styrene monomer conventionally used as a reactive diluent), a curing agent and a diluent may be mentioned.

(Thermoplastic resin)
Although it does not specifically limit as a thermosetting resin, From a viewpoint of obtaining the hardened | cured material excellent in chemical resistance, for example, unsaturated polyester resin, vinyl ester resin, urethane (meth) acrylate resin, etc. are mentioned, Vinyl ester resin Is more preferable. These resins may be used alone or in combination of two or more. The use of such a thermosetting resin that gives a cured product having excellent chemical resistance is particularly useful when the existing pipe is a sewer pipe.

  The unsaturated polyester resin is a condensation product obtained by an esterification reaction of a polyhydric alcohol with an unsaturated polybasic acid and any saturated polybasic acid. It does not specifically limit as unsaturated polyester resin, What was manufactured by the well-known method is selected suitably by those skilled in the art.

  The unsaturated polybasic acid (polybasic acid having a polymerizable unsaturated bond) used as a raw material for the unsaturated polyester resin is not particularly limited. For example, fumaric acid, maleic acid, citraconic acid, itaconic acid or anhydrides thereof Such as things. Saturated polybasic acid (polybasic acid having no polymerizable unsaturated bond) used as a raw material for the unsaturated polyester resin is not particularly limited. For example, phthalic acid, isophthalic acid, het acid, succinic acid, terephthalic acid, Tetrahydrophthalic acid, adipic acid, sebacic acid or their anhydrides can be mentioned. Although it does not specifically limit as polyhydric alcohol used as a raw material of unsaturated polyester resin, For example, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, triethylene glycol, pentanediol, hexanediol, neopentanediol 1,2-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3- Examples include propanediol, cyclohexane-1,4-dimethanol, bisphenol A, hydrogenated bisphenol A, bisphenol A ethylene oxide adduct, bisphenol A propylene oxide adduct, and glycerin.The raw materials for these unsaturated polyester resins can be used alone or in combination of two or more. The conditions for synthesizing the unsaturated polyester resin are not particularly limited, and are appropriately set by those skilled in the art depending on the type of raw material used.

  The vinyl ester resin is also called an epoxy (meth) acrylate resin, and is formed by a ring-opening reaction between a compound having a glycidyl group (epoxy group) and a carboxyl group of a carboxyl compound having a polymerizable unsaturated bond. A compound having an unsaturated bond. It does not specifically limit as vinyl ester, What was manufactured by the well-known method is suitably selected by those skilled in the art.

  Although it does not specifically limit as a compound which has a glycidyl group (epoxy group) used as a raw material of vinyl ester resin, For example, bisphenol A diglycidyl ether and its high molecular weight homologue, novolak-type glycidyl ether, etc. are mentioned. Although it does not specifically limit as a carboxyl compound which has a polymerizable unsaturated bond used as a raw material of vinyl ester resin, For example, unsaturated monobasic acids, such as acrylic acid and methacrylic acid; Bisphenol (A type etc.), adipic acid, sebacin Examples thereof include dibasic acids such as acids and dimer acids. In particular, if dibasic acid is used as a raw material, flexibility can be imparted to the vinyl ester resin. These raw materials for vinyl ester resins can be used alone or in combination of two or more. The conditions for synthesizing the vinyl ester resin are not particularly limited, and are appropriately set by those skilled in the art depending on the type of raw material used.

  Examples of the urethane (meth) acrylate resin include a resin having a urethane bond and a (meth) acryloyl group obtained by reacting an aliphatic polyisocyanate compound or an aromatic polyisocyanate compound with a (meth) acrylate compound having a hydroxyl group. .

  Examples of the aliphatic polyisocyanate compound include tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, heptamethylene diisocyanate, octamethylene diisocyanate, decamethylene diisocyanate, 2-methyl-1,5-pentane diisocyanate, 3-methyl- 1,5-pentane diisocyanate, dodecamethylene diisocyanate, 2-methylpentamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, norbornane diisocyanate, hydrogenated diphenylmethane diisocyanate , Hydrogenated tolylene diisocyanate, hydrogenated xylile Examples include diisocyanate, hydrogenated tetramethylxylylene diisocyanate, cyclohexyl diisocyanate, and the aromatic polyisocyanate compound includes tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, xylylene diisocyanate, 1,5-naphthalene diisocyanate, Examples include toridine diisocyanate and p-phenylene diisocyanate.

On the other hand, examples of the acrylate compound having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1, Monovalent dihydric alcohols such as 5-pentanediol mono (meth) acrylate, 1,6-hexanediol mono (meth) acrylate, neopentyl glycol mono (meth) acrylate, and hydroxypivalate neopentyl glycol mono (meth) acrylate ( Meth) acrylate; trimethylolpropane di (meth) acrylate, ethoxylated trimethylolpropane (meth) acrylate, propoxylated trimethylolpropane di (meth) acrylate, glycerin di (meth) acrylate Mono- or di (meth) acrylates of trivalent alcohols such as relate, bis (2- (meth) acryloyloxyethyl) hydroxyethyl isocyanurate, or hydroxyl groups obtained by modifying some of these alcoholic hydroxyl groups with ε-caprolactone Mono- and di (meth) acrylates having a monofunctional hydroxyl group and tri- or more functional (meth) acryloyl such as pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, etc. A compound having a group, or a polyfunctional (meth) acrylate having a hydroxyl group obtained by modifying the compound with ε-caprolactone; dipropylene glycol mono (meth) acrylate, diethylene glycol mono (meth) acrylate, poly (Meth) acrylate compounds having an oxyalkylene chain such as propylene glycol mono (meth) acrylate and polyethylene glycol mono (meth) acrylate; polyethylene glycol-polypropylene glycol mono (meth) acrylate, polyoxybutylene-polyoxypropylene mono (meth) (Meth) acrylate compounds having a block structure oxyalkylene chain such as acrylate; random structures such as poly (ethylene glycol-tetramethylene glycol) mono (meth) acrylate and poly (propylene glycol-tetramethylene glycol) mono (meth) acrylate And (meth) acrylate compounds having an oxyalkylene chain.
The reaction between the aliphatic polyisocyanate compound or the aromatic polyisocyanate compound and the acrylate compound having a hydroxyl group can be performed by a conventional method in the presence of a urethanization catalyst.

  The amount of the thermosetting resin in the thermosetting resin composition is, for example, 20 parts by weight or more and 70 parts by weight or less when the total amount of the thermosetting resin and the reactive diluent is 100 parts by weight, preferably It may be 30 parts by weight or more and 60 parts by weight or less. It is preferable that the amount of the thermosetting resin is not less than the above lower limit in that the rehabilitated tube can be obtained as a highly elastic cured product, and that it is not more than the above upper limit is that the viscosity of the curable resin composition is It is preferable in that the fiber is appropriately low and the impregnation property to the fiber base material is good.

(Reaction initiator)
The reaction initiator is a radical initiator (thermal radical initiator) that functions as a curing agent for the thermosetting resin described above. As the reaction initiator, diisobutyl peroxide, cumyl peroxyneodecanate, di-n-propyl peroxycarbonate, diisopropyl peroxycarbonate, di-sec-butyl peroxycarbonate, 1,1,3,3 -Tetramethylbutylperoxyneodecanate, di (4-t-butylcyclohexyl) peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, t-hexylperoxyneodecane, t-butylperoxyneo Decanate, t-butylperoxyneoheptanoate, t-hexylperoxypivalate, t-butylperoxypivalate, di (3,5,5-trimethylhexanoyl) peroxide, dilauroyl peroxide, 1, 1,3,3-tetramethylbutyl -Oxy-2-ethylhexanate, disuccinic acid peroxide, 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethylhexanate, di (4 -Methylbenzoyl) peroxide, t-butylperoxy-2-ethylhexanate, dibenzoyl peroxide, 1,1-di (t-butylperoxy) -2-methylcyclohexane, 1,1-di (t- (Hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1-di (t-hexylperoxy) cyclohexane, 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (4 4-di- (t-butylperoxy) cyclohexyl) propane, t-hexylperoxyisopropyl monocarbonate, -Butylperoxymaleic acid, t-butylperoxy-3,5,5-trimethylhexanate, t-butylperoxylaurate, t-butylperoxyisopropyl monocarbonate, t-butylperoxy 2-ethylhexyl monocarbonate T-hexylperoxybenzoate, 2,5-di-methyl-2,5-di (benzoylperoxy) hexane, t-butylperoxyacetate, 2,2-di (t-butylperoxy) butane, t-butylperoxybenzoate, n-butyl-4,4-di- (t-butylperoxy) valerate, di (2-t-butylperoxyisopropyl) benzene, dicumyl peroxide, di-t-hexyl Peroxide, t-butylcumyl peroxide, di-t-butyl peroxide, p-menthane hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3, 3,5-diisopropylbenzene hydroperoxide, 1,1,3,3-tetramethyl Organic peroxides such as butyl hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide, 2,3-dimethyl-2,3-diphenylbutane; and azo compounds such as azobisisobutyronitrile. These reaction initiators can be used alone or in combination of two or more. The reaction initiator has a unique reaction initiation temperature depending on the structure.

The amount of the reaction initiator in the thermosetting resin composition is not particularly limited, and is appropriately determined according to the kind of the reaction initiator and the heating conditions.
In the thermosetting resin composition, the proportion of the total amount of the thermosetting resin and the reactive diluent may be, for example, 90% by weight or more, preferably 94% by weight or more. Thereby, physical properties such as mechanical strength of the rehabilitated pipe can be obtained satisfactorily.

(Reactive diluent)
The reactive diluent is an example of a diluent contained in the thermosetting resin composition from the viewpoint of reducing viscosity or adjusting the reactivity.

  The reactive diluent (also referred to as a polymerizable cross-linking agent) is not particularly limited as long as it has an unsaturated bond polymerizable with the thermosetting resin, and the reactive monomer and its derivative (polymerizable group). And derivatives thereof. Specific examples include (meth) acrylate crosslinking agents, maleate ester crosslinking agents, fumarate ester crosslinking agents, and diallyl phthalate crosslinking agents.

  As the (meth) acrylate-based crosslinking agent, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, furfuryl ( (Meth) acrylate, tetrahydrofurfuryl (meth) acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2 -Hydroxybutyl (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, 2-methacryloyloxyethyl 2-hydroxypropyl lid Dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, glycidyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1, 4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, 1,10-decanediol di (meth) acrylate, trimethylolpropane tri (Meth) acrylate, glycerin di (meth) acrylate, methoxytriethylene glycol (meth) acrylate, butoxyethyl (meth) acrylate, neopentyl glycol di (meth) acrylate, trif Oroechiru (meth) acrylate, perfluorooctyl ethyl (meth) acrylate, allyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyl oxyethyl (meth) acrylate.

Examples of maleate ester crosslinking agents include diethyl maleate and dibutyl maleate. Examples of the fumaric acid ester crosslinking agent include dibutyl fumarate and dioctyl fumarate.
Examples of diallyl phthalate crosslinking agents include diallyl phthalate monomers and diallyl phthalate prepolymers.
These reactive diluents can be used alone or in combination of two or more.

  The amount of the reactive diluent in the thermosetting resin composition is, for example, 30 parts by weight or more and 80 parts by weight or less, preferably 40 parts when the total amount of the thermosetting resin and the reactive diluent is 100 parts by weight. It may be not less than 70 parts by weight. That the amount of the reactive diluent is not less than the above lower limit is preferable in that the viscosity of the thermosetting resin composition is appropriately low and the impregnation property to the fiber base material is good, and is not more than the above upper limit. It is preferable that the rehabilitation tube can be obtained as a highly elastic cured product.

(Non-reactive diluent)
As the diluent, in addition to the reactive diluent, a non-reactive diluent may be contained.
The non-reactive diluent is not particularly limited. For example, phthalic acid esters such as dioctyl phthalate and dibutyl phthalate; ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether acetate, Diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether acetate, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, di B propylene glycol monobutyl ether acetate, esters of glycol ethers such as 3-methoxybutyl acetate; alcohols such as benzyl alcohol.

(Additive)
The curable resin composition may contain additives other than those described above.
For example, from the viewpoint of improving strength characteristics, the curable resin composition may contain an inorganic filler having a pH of 10 or less, such as glass powder, silica, talc, kaolin, mica, and aluminum hydroxide, as an additive. (The pH of the inorganic filler is 0.5 g of inorganic filler in a 100 ml Erlenmeyer flask with a stopper, and then 100 ml of distilled water is added and sealed. Using a stirrer at a temperature of 23 ± 5 ° C., it is 600 rpm. Stir and extract for 24 hours at the number of rotations, and measure the pH of the supernatant after standing in accordance with JISZ8802 “Method for measuring pH.” The inorganic filler is surface-treated with the silane coupling agent described above. It's okay.
The proportion of the inorganic filler in the thermosetting resin composition may be, for example, 1% by weight to 5% by weight. It is preferable that the ratio of the inorganic filler is not less than the above lower limit value from the viewpoint of improving the strength characteristics of the rehabilitated pipe, and that it is not more than the above upper limit value impregnates the resin absorption layer and the reinforcing layer uniformly with the resin. It is preferable in terms of workability.

  From the viewpoint of promoting curing, the curable resin composition may contain a curing accelerator as an additive. Curing accelerators include Cu, Fe, Co, Mn, Al, Ti, Zr, Ni and other organometallic salts such as octylic acid, stearic acid, naphthenic acid, acetylacetonate, Ti, Sn, Bi, Zr, Al Alkoxides of metals such as, phenol compounds such as octylphenol and nonylphenol, alcohols such as 1-butanol and 2-ethylhexanol, 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 1-cyanoethyl- Imidazole derivatives such as 2-phenylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, dicyandiamide, Benzyldimethyla Emissions, 4-methyl -N, amine compounds such as N- dimethylbenzylamine, phosphine is like phosphorus compounds phosphonium.

  From the viewpoint of preventing dimensional changes, the curable resin composition may contain a normal salt composed of a strong acid and a cobase as an additive. For example, sodium chloride, potassium chloride, lithium chloride, sodium bromide, potassium bromide, lithium bromide, sodium sulfate, potassium sulfate, lithium sulfate, sodium nitrate, potassium nitrate, lithium sulfate and the like can be mentioned.

  From the viewpoint of defoaming when the curable composition is mixed, an antifoaming agent may be included in the curable resin composition as an additive. Types of antifoaming agents include: silicone defoamers such as oil-type silicone defoamers and emulsion-type silicone defoamers; defoaming polymer-type defoamers such as nonionic polyethers; special nonionic surfactants Polyether modified methyl alkyl polysiloxane copolymer; polyethylene glycol type nonionic surfactant; and vegetable oil-based antifoaming agent.

[2-3. Inner layer]
The inner layer 220 is laminated on the side corresponding to the inside of the rehabilitation pipe 800 (see FIG. 3). The inner layer 220 protects the reinforcing layer 210 from water vapor by passing heat from the heat medium and blocking water vapor that may be contained in the heat medium. The inner layer 220 is preferably a continuous tubular shape that is seamless in the circumferential direction from the viewpoint of obtaining a better blocking ability.
The inner layer 220 may be peeled off from the rehabilitation tube after the curing step, or may be integrated with the rehabilitation tube. When the inner layer 220 is peeled off from the rehabilitated tube after the curing step, the smoothness of the surface 222 on the reinforcing layer 210 side of the inner layer 220 makes the innermost surface of the rehabilitated tube (that is, the surface of the reinforcing layer 210 exposed after curing) smooth. Become. When the inner layer 220 is integrated without being peeled from the rehabilitation pipe 800 after the curing step, the smoothness of the surface 221 of the inner layer 220 opposite to the reinforcing layer 210 causes the innermost surface of the rehabilitation pipe (that is, integrated). The surface 221) of the inner layer 220 is smooth. Since the innermost surface of the rehabilitating pipe is smooth, the flow resistance in the existing pipe after rehabilitation can be reduced and liquid can be passed at a good flow rate.

  The thickness of the inner layer 220 may be, for example, not less than 0.1 mm and not more than 0.2 mm. It is preferable that the thickness is equal to or greater than the above lower limit value in terms of obtaining a good water-stopping property, and that the thickness is equal to or less than the upper limit value is preferable in terms of preventing an increase in total thickness.

The inner layer 220 in the lining material 100 is made of only resin.
It is preferable that the inner layer 220 is composed of only a resin, for example, by selecting a functional resin as the constituent resin, so that the functionality can be easily imparted to the inner layer 220. Specifically, high heat resistance can be easily imparted to the inner layer 220 by selecting a high heat resistance resin as the constituent resin.
Further, in comparison with the case where a resin layer laminated on the surface of a fiber base material is used instead of the inner layer 220, when the rehabilitating tube 800 is formed under the immediate heat curing conditions, bubbles are generated in the inner layer 220 (that is, the innermost surface). This is also preferable in that the occurrence of unevenness in 221) can be prevented and the flow rate after construction can be secured satisfactorily.

  The resin constituting the inner layer 220 preferably includes, for example, a gas barrier and heat resistant thermoplastic resin. As such a thermoplastic resin, a polyamide-based resin is preferable. Polyamide resins (polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9), polyundecanamide (nylon-11), polylauryl lactam (Nylon-12), polyethylenediamine adipamide (nylon-2,6), polytetramethylene adipamide (nylon-4,6), polyhexamethylene adipamide (nylon-6,6), polyhexamethylene Sebacamide (Nylon-6,10), Polyhexamethylene dodecamide (Nylon-6,12), Polyoctamethylene adipamide (Nylon-8,6), Polydecamethylene adipamide (Nylon-10,8) ), Caprolactam / lauryl lactam copolymer (nylon-6 / 12), caprolactam / ω-aminononanoic acid copolymer (nylon-6 / 9), caprolactam / Hexamethylene diammonium adipate copolymer (nylon-6 / 6,6), lauryl lactam / hexamethylene diammonium adipate copolymer (nylon-12 / 6,6), ethylenediamine adipamide / hexamethylene diammonium adipate Copolymer (nylon-2,6 / 6,6), caprolactam / hexamethylenediammonium adipate / hexamethylenediammonium sebacate copolymer (nylon-6 / 6,6 / 6,12), ethyleneammonium adipate / And hexamethylene diammonium adipate / hexamethylene diammonium sebacate copolymer (nylon-6 / 6, 6/6, 10). These resins may be used alone or in combination.

  As specific heat resistance of the above-mentioned thermoplastic resin, it is preferable that the melting point is, for example, 180 ° C. or higher in consideration of the temperature condition of immediate heat curing. As a result, the inner layer 220 is prevented from being broken even under immediate heat curing conditions, so that the occurrence of unevenness on the innermost surface 221 due to the leakage of the impregnating resin in the adjacent fiber base material is prevented, and the flow rate after construction is ensured. can do.

  The inner layer 220 may be configured as a laminate of a plurality of resin layers. For example, a hydrophobic resin layer may be laminated at least on the side corresponding to the innermost side of the rehabilitation pipe 800. Examples of the hydrophobic resin include polyolefin and fluororesin. As a result, the innermost surface 221 of the rehabilitation pipe 800 becomes hydrophobic, so that the flow coefficient of the rehabilitation pipe 800 (shown in the Hazen-Williams equation) increases, and the flow rate after construction can be secured satisfactorily. A more specific example of the structure of the inner layer 200 is a multilayer structure in which a polyamide resin layer is used as an inner layer and a polyolefin resin layer is laminated on both surfaces thereof.

[2-4. Still water layer]
The water blocking layer 230 can block intrusion water such as groundwater when the lining material 100 is constructed.
Further, the water blocking layer 230 can prevent the rehabilitation pipe 800 (see FIG. 3) formed from the lining material 100 from being bonded to the existing pipe line 900. Specifically, adhesion of the metal pipe 910 constituting the existing pipe line 900 to the mortar lining 920 is prevented. As a result, the rehabilitation pipe 800 does not follow the existing pipe line 900, and allows sliding between the surfaces facing each other. In this case, the local distortion of the existing pipeline 900 caused by earthquake motion or the like can be reduced as the overall distortion of the rehabilitation pipe 800.

  The resin constituting the water-stopping layer 230 is selected according to the above-described characteristics that the water-stopping layer 230 is provided with. For example, at least a polyamide-based resin is preferably included. Examples of the polyamide-based resin that can be scooped in the water-stopping layer 230 include the resins mentioned in the above inner layer 220.

  The water blocking layer 230 may be configured as a laminate of a plurality of resin layers. For example, it may have a multilayer structure in which a polyamide resin layer is used as an inner layer and a polyolefin resin layer is laminated on both surfaces thereof. Thereby, the tearing at the time of construction of the lining material 100 is prevented.

  The thickness of the water blocking layer 230 may be, for example, not less than 0.1 mm and not more than 0.2 mm. It is preferable that the thickness is equal to or more than the lower limit value in terms of easily exhibiting the above-described characteristics by the water blocking layer 230, and it is preferable that the thickness is equal to or less than the upper limit value in order to prevent the total thickness from being enlarged.

[2-5. Other examples]
The configuration of the lining material that can be used in the method for rehabilitating the existing pipe line of the present invention is not limited to the lining material 100 described above. Since the lining material only needs to be configured to include at least the fiber reinforced resin layer 211, even if one or more layers of the inner layer 220, the water blocking layer 230, and the resin absorption layer 212 are arbitrarily discarded. Good. Further, the constituent layers of the fiber reinforced resin layer 211 shown in FIG. 4 (a reinforced fiber layer 211CD having a circumferential orientation, a reinforced fiber layer 211AD having an axial orientation, and a reinforced fiber layer 211NW having no orientation) ) May be changed to a single layer composed of only one of the above-mentioned layers, or any combination of the constituent layers of the fiber reinforced resin layer 211 shown in FIG. You may change to the laminated body of. Furthermore, the stacking order of the constituent layers of the fiber reinforced resin layer 211 shown in FIG. 4 may be arbitrarily changed.

[Experimental Example 1: Preparation of thermosetting resin composition]
In the following skeletal resin (a), the reactive diluent (b), the inorganic filler (c), and other components (d) are shown in Table 1 in proportions (the amounts of each component in Table 1 are parts by weight). And the mixture was stirred at 500 to 1,000 rpm for 5 to 10 minutes to prepare a thermosetting resin composition (r6) from the thermosetting resin composition (r1).

(A) Skeletal resin:
(A1) Vinyl ester resin (a2) Unsaturated polyester resin (b) Reactive diluent:
(B1) Methacrylic acid ester (b2) Diallyl phthalate (b3) Styrene (c) Initiator:
(C1) Kaya ester O-50E (manufactured by Kayaku Akzo)
(C2) Parkadox 16 (manufactured by Kayaku Akzo)
(D) Inorganic agent Silicon dioxide (e) Others Cobalt catalyst, etc.

[Experimental example 2: Production of lining material model and rehabilitation pipe model]
Using a nonwoven fabric of PET with a basis weight of 2,250 g / m ² and a thickness of 12 mm, the thermosetting resin composition (r1) to the thermosetting resin composition (r6) prepared in Experimental Example 1 were impregnated, respectively, and a lining material model Was made. Each lining material model was subjected to the following heating conditions (immediate heat curing conditions (A) and normal heat curing conditions (B)) to prepare rehabilitation pipe models.

[Experimental example 3: Evaluation of rehabilitation pipe model]
Rehabilitation pipe models (Example 1-1 to Example 1-4) obtained by subjecting the thermosetting resin composition r1 to the thermosetting resin composition r4 to immediate heating and curing conditions A, respectively, and the thermosetting resin From the rehabilitation pipe model (Comparative Example 1-1 and Comparative Example 1-2) obtained by subjecting the composition r5 and the thermosetting resin composition r6 to immediate heat curing conditions A, respectively, and the thermosetting resin composition r1 Rehabilitation pipe model (Comparative Example 2-1 to Example 2-4) obtained by subjecting each thermosetting resin composition r4 to normal heating and curing conditions B, thermosetting resin composition r5 and thermosetting resin About the rehabilitation pipe model (Comparative Example 3-1 and Comparative Example 3-2) obtained by subjecting the composition r6 to the normal heat curing condition B, the following evaluations (i) to (iv) were performed. . The results are shown in Tables 3 and 4.

Evaluation (i):
The density of the welfare tube model was measured. Furthermore, about Example 1-1 to Example 1-4, Comparative Example 1-1, and Comparative Example 1-2, respectively, the corresponding Comparative Example 2-1 to Example 2-4 and Comparative Example 3-1 respectively. The density retention rate was also calculated when the density of the rehabilitation pipe model in Comparative Example 3-2 was 100%.
Evaluation (ii):
Cross-sectional observation of the rehabilitation tube model was performed to evaluate the presence or absence of voids.
Evaluation (iii):
The bending strength was measured according to JIS K 7171. Furthermore, about Example 1-1 to Example 1-4, Comparative Example 1-1, and Comparative Example 1-2, respectively, the corresponding Comparative Example 2-1 to Example 2-4 and Comparative Example 3-1 respectively. And the bending strength retention rate when the bending strength of the rehabilitation pipe model in Comparative Example 3-2 was 100% was also calculated.
Evaluation (iv):
Flexural elasticity was measured according to JIS K 7164. Furthermore, about Example 1-1 to Example 1-4, Comparative Example 1-1, and Comparative Example 1-2, respectively, the corresponding Comparative Example 2-1 to Example 2-4 and Comparative Example 3-1 respectively. And the bending elastic retention when the bending elasticity of the rehabilitation pipe model in Comparative Example 3-2 was 100% was also calculated.

[Experimental Example 4: Characteristic evaluation of rehabilitation tube]
One end and the other end of the fiber base material having the laminated structure shown in Table 5 (corresponding to the laminated structure of FIG. 4) are overlapped, and the ends are connected to each other at the overlapped part. By fastening, a tubular fiber substrate (outer diameter 250 mm, total thickness 3 mm) was obtained.

A nylon film (0.15 mm) having a laminated structure of PE / NY / PE was laminated on both sides of the above fiber base material as an inner layer and a water-stopping layer to obtain a laminated tubular body.
The inner surface of one end of the obtained laminated tubular body is depressurized with a vacuum pump, and the thermosetting resin composition r1 or the thermosetting resin composition is applied from the opposite tube end to the laminated tubular resistant fiber substrate. The product r2 was impregnated with an impregnation roll. Thus, the lining material 100 was obtained.

  The obtained lining material 100 was drawn in and inserted into the buried pipe with a ground winch (see FIG. 1B). Subsequently, a pipe end plug was attached to the end of the lining material 100, the diameter of the lining material 100 was expanded with compressed air (see FIG. 1C), and the lining material 100 was pressed against the inner wall of the existing pipe. In this state, steam is introduced into the lining material 100, and the thermosetting resin composition is heated and cured under the immediate heat curing condition (A) or the normal heat curing condition (B) (FIG. 1 (d). )reference). After curing, rehabilitation tube 800 was obtained.

  Rehabilitation tubes (Example 2-1 and Example 2-2) obtained by subjecting the thermosetting resin composition r1 and the thermosetting resin composition r2 to immediate heating and curing conditions (A), respectively, and thermosetting The rehabilitation pipe (Comparative Example 4-1) obtained by subjecting the resin composition r5 to the immediate heat curing conditions (A), the thermosetting resin composition r1 and the thermosetting resin composition r2 are usually heated and cured, respectively. Rehabilitation pipes (Comparative Example 5-1 and Comparative Example 5-2) obtained by subjecting to (B) and rehabilitation pipes obtained by subjecting thermosetting resin composition r5 to normal heat curing conditions (B) ( The following evaluation (v) was performed for Comparative Example 6-1). The results are shown in Tables 6 and 7.

Evaluation (v):
A flattening test was performed by JSWAS K-1. Furthermore, about Example 2-1 and Example 2-2, and Comparative Example 4-1, the flatness of the rehabilitation pipe | tube in corresponding Comparative Example 5-1, Comparative Example 5-2, and Comparative Example 6-1 respectively. The y flattening result retention was calculated when the result was 100%.

  Preferred embodiments of the present invention are as described above, but the present invention is not limited to them, and various other embodiments are possible without departing from the spirit of the present invention.

100 Lining material 211CD Reinforced fiber layer 211AD oriented in the circumferential direction Reinforced resin layer 800 oriented in the axial direction Rehabilitated pipe 900 Existing pipe

Claims (6)

Introducing a lining material containing a fiber base material impregnated with a thermosetting resin composition into the existing pipeline,
Curing the thermosetting resin composition by bringing a heat medium into contact with the inner surface of the lining material to form a rehabilitation pipe,
The thermosetting resin composition includes a reaction initiator and a reactive diluent having a boiling point of 180 ° C. or higher, and at the initial stage of the curing step, the temperature of the lining material is equal to or higher than the reaction start temperature of the reaction initiator. A method for rehabilitating a pipeline, wherein the temperature is raised to a temperature below the boiling point of the reactive diluent.   The reactive diluent is selected from the group consisting of (meth) acrylic acid ester crosslinking agents, fumarate ester crosslinking agents, maleate ester crosslinking agents, and diallyl phthalate crosslinking agents. How to rehabilitate the pipeline.   The method for rehabilitating a pipeline according to claim 1 or 2, wherein the initial stage is within 20 minutes from the time when the heat medium is introduced into the lining material.   The method for rehabilitating a pipeline according to any one of claims 1 to 3, wherein the time required for the curing step is 3 hours or less.   The method for rehabilitating a pipeline according to any one of claims 1 to 4, wherein the thermosetting resin composition includes a vinyl ester resin as a thermosetting resin.   The said fiber base material contains the layer of the reinforced fiber orientated in the circumferential direction of the said existing pipe line, and the layer of the reinforced fiber orientated in the axial direction of the said existing pipe line. Rehabilitation method for pipelines as described in the paragraph.