JP2016104561A - Lining material for existing tube renovation and renovation method of existing tube using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lining material for existing tube renovation having strength properties similar to conventional lining materials for existing tube renovation, enhanced tensile breaking elongation and high earthquake resistance and a renovation method of an existing tube.SOLUTION: There are provided a lining material for existing tube renovation consisting of a tube lining material and a thermosetting furan resin composition impregnated into the tube lining material and containing a furan resin (A), a curing material (B) and a core shell type rubber polymer (C) and a renovation method of an existing tube by coating an inner wall of the existing tube by the lining material and including a process of impregnating the thermosetting furan resin composition into the tube lining material, a process of inserting the tube lining material into the existing tube and a process of curing the impregnated thermosetting furan resin composition with a condition to press the inserted tube lining material to the inner wall of the existing tube to cover the inner wall of the existing tube.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to an existing pipe rehabilitation lining material and an existing pipe rehabilitation method using the same.

  There is an existing pipe rehabilitation method that repairs the pipeline by lining the inner surface of the pipeline when the existing pipeline, for example, underground pipes such as water and sewage pipes, agricultural water pipes, and industrial water pipes buried in the ground are aged. Various proposals have been made and put into practical use.

  As one of such rehabilitation methods, first, an uncured curable resin is impregnated into a tubular resin-adsorbing base material to form a tubular lining material. Next, the tubular lining material is inverted (inverted) and inserted into the pipe line by fluid pressure. Thereafter, there is a rehabilitation pipe construction method in which the tubular lining material is pressed against the inner wall of the pipe and the curable resin impregnated in this state is cured and fixed (see, for example, Patent Document 1).

  In this type of construction method, the tubular lining material is flattened in a state of being folded and stacked in a sealed container, folded at one end, and attached to the outer periphery of the open end of the reversing nozzle connected to the sealed container, Fluid pressure (water pressure, air pressure) is applied to the sealed container, and the lining material is inverted and inserted into the pipeline. Then, the inner surface of the pipe line is lined by the lining material that is heated and cured with steam or hot water while pressing the lining material against the inner face of the pipe line.

  As the curable resin used in the rehabilitation method, unsaturated polyester and epoxy resin are generally used. Moreover, furan resin is used as curable resin (for example, refer patent document 2). However, unsaturated polyester, epoxy resin, furan resin, and the like have a small tensile elongation at break. Therefore, especially in recent years when seismic resistance of water and sewage pipes is required, unsaturated polyester, epoxy resin and furan resin are not appropriate as materials for repairing and / or rehabilitating aging existing pipes.

JP 2003-165158 A International Publication No. 2011/125534

  The present disclosure has been made in view of the above problems, and has the same strength characteristics as existing pipe rehabilitation lining materials made of unsaturated polyester, epoxy resin, furan resin, and the like, and has improved tensile elongation at break. An object of the present invention is to provide an existing pipe rehabilitation lining material having high earthquake resistance and a method for rehabilitating an existing pipe using the same.

This disclosure
(1) a tubular lining material;
A lining for existing pipe rehabilitation comprising a thermosetting furan resin composition containing a furan resin (A), a curing agent (B) and a core-shell type rubber polymer (C) impregnated in the tubular lining material. Wood.
(2) The core-shell type rubber polymer (C) includes the polymer that is a main component of the shell layer that is in a glass state at 20 ° C. and the polymer that is a main component of the core layer that is in a rubber state at 20 ° C. Lining material for pipe rehabilitation.
(3) The existing lining material for pipe rehabilitation, wherein the core-shell type rubber polymer (C) is a glassy polymer having a shell layer having a hydroxyl group.
(4) The existing pipe rehabilitation lining material, wherein the core-shell type rubber polymer (C) is 90% by weight or more and has an outer diameter of 20 μm or less.
(5) The tubular lining material is
A tubular lining material in which an impermeable film, a first resin-absorbing substrate, a reinforcing fiber substrate, and a second resin-adsorbing substrate are laminated in this order;
A tubular lining material in which an impermeable film, a first resin-absorbing substrate and a second resin-absorbing substrate are laminated in this order;
The existing lining material for rehabilitating a pipe, which is either a tubular lining material made of a first resin-absorbing base material or a tubular lining material made by laminating a first resin adsorbing base material and a first reinforcing fiber base material.
(6) A method for rehabilitating an existing pipe that covers the inner wall of the existing pipe with the above-described existing pipe rehabilitation lining material,
Impregnating the tubular lining material with the thermosetting furan resin composition;
The step of inserting the tubular lining material into the existing pipe, and the impregnated thermosetting furan resin composition is cured by pressing the inserted tubular lining material against the inner wall of the existing pipe, and the existing pipe. A method for rehabilitating an existing pipe, comprising a step of covering the inner wall of the pipe.
(7) The step of inserting the tubular lining material into the existing pipe,
Pull the tubular lining material into the existing pipe and insert it,
Insert the tubular lining material while reversing it into the existing pipe by fluid pressure,
The first tubular lining material is drawn into the existing pipe and inserted, and the second tubular lining material is inserted inside the first lining material while being inverted by fluid pressure. Rehabilitation method.
(8) The method of rehabilitating the existing pipe, wherein the step of inserting the tubular lining material into the existing pipe is a step of inserting the tubular lining material impregnated with the thermosetting furan resin composition into the existing pipe. .

The existing pipe rehabilitation lining material of the present disclosure has both strength characteristics equivalent to those of a conventional existing pipe rehabilitation lining material and good tensile elongation at break, and can achieve high earthquake resistance.
Moreover, by using such existing pipe rehabilitation lining material, the inner surface of an aged existing pipe (especially a buried pipe) can be lined by a simple method equivalent to the conventional method, and the pipe line can be surely connected. The existing pipes can be rehabilitated so as to repair and provide seismic performance.

It is a fragmentary sectional view showing an example of the existing pipe rehabilitation lining material of this indication. It is sectional drawing of an example of the lining material for existing pipe rehabilitation of this indication of the state integrated with the existing pipe inner wall. It is explanatory drawing which shows 1 process of the rehabilitation method of the existing pipe | tube of this indication. It is explanatory drawing which shows 1 process of the rehabilitation method of another existing pipe of this indication.

[Lining materials for existing pipe rehabilitation]
The existing pipe rehabilitation lining material of the present disclosure (hereinafter sometimes referred to as a lining material) includes a tubular lining material and a thermosetting furan resin composition impregnated therein.

(Tubular lining material)
The tubular lining material includes at least a resin-absorbing base material that can be impregnated with the thermosetting furan resin composition. The tubular lining material may be composed of one layer of resin-absorbing substrate, or may be composed of two or more layers of resin-absorbing substrate. The tubular lining material may further include an impermeable film and / or one or more reinforcing fiber substrates.
Specifically, (i) a tubular lining material in which a water-impermeable film, a first resin-absorbing substrate, a reinforcing fiber substrate, and a second resin-adsorbing substrate are laminated in this order, (ii) a water-impermeable film, A tubular lining material in which a first resin-absorbing substrate and a second resin-absorbing substrate are laminated in this order, (iii) a tubular lining material comprising a first resin-absorbing substrate, and (iv) a first resin-adsorbing material Tubular lining material formed by laminating a base material and a first reinforcing fiber base material, (v) a water-impermeable film, a first resin absorbing base material, a first reinforcing fiber base material, an n-1 resin absorbing base material And a tubular lining material in which the n-1th reinforcing fiber substrate and the nth resin adsorbing substrate are laminated in this order. Among these, a water-impermeable film and a tubular lining material in which a resin-absorbing base material and a reinforcing fiber base material are laminated one layer at a time or two or more layers alternately in this order are preferable.
The total thickness of the tubular lining material is, for example, preferably 2.0 mm or more, and more preferably 2.0 mm to 20 mm.

(1) Resin-absorbing base material The resin-absorbing base material is a base material impregnated with the thermosetting furan resin composition and has a porosity of 90% or less, preferably 10 to 90%. Thereby, a thermosetting furan resin composition can be impregnated reliably and / or in large quantities. As a result, it is possible to minimize the problem that voids and the like are formed on the cured resin-absorbing substrate, and a material having high strength can be obtained.
The resin-absorbing substrate preferably has a wall thickness of 0.1 mm or more, and preferably 0.2 mm or more. Thereby, sufficient protection characteristics can be expressed.

As described above, the resin-absorbing substrate may be a single layer, or a laminated structure made of the same material or a laminated structure made of different materials. When a plurality of resin-absorbing substrates are separated to form a tubular lining material, the separated layers may be the same material or different materials.
Examples of the resin-absorbing substrate include a nonwoven fabric and a chopped strand mat.

Examples of the non-woven fabric include resins such as polyester, high density polyethylene (HDPE), and polypropylene, and natural materials such as cotton, linseed, flax burlap, and kenaf, and those made of high strength and high elasticity are preferable. When natural fibers are used, the entire existing lining material for pipe rehabilitation is preferably made of a non-petroleum material. Natural fibers are particularly preferably linseed and flax from the viewpoints of resin impregnation, processability, supply stability and the like.
Also, felt, mat, spunbond, web, etc. that are flexible and porous and have continuous filaments or staple fibers can be used.
As a chopped strand mat, for example, after strands such as glass fibers are cut into a certain length and dispersed in a mat shape, a sticky adhesive such as a thermoplastic resin is uniformly applied and thermally melted. Can be used as a mat.
Among them, the chopped strand mat can obtain higher strength than the resin nonwoven fabric.

(2) Water-impermeable film The water-impermeable film can be formed of a synthetic resin material such as polyethylene, polypropylene, nylon, polyester, polyvinyl chloride, elastomer, and synthetic rubber. The impermeable film has a thickness of about 0.2 to 2.0 mm.
The water-impermeable film is preferably formed on one surface of the resin-absorbing base material and / or the reinforcing fiber in a liquid-tight manner, and is preferably formed on the inner surface of the tubular lining material, and further formed on the inner surface and the outer surface. preferable. Thereby, the use of the tubular lining material impregnated with the thermosetting furan resin composition can be facilitated. For example, when the inner wall of an existing pipe is coated with a tubular lining material, the thermosetting furan resin composition is applied to the inner wall of the existing pipe by pressing the tubular lining material against the inner wall of the existing pipe from the water-impermeable film side. It can be surely extended, and adhesion of the thermosetting furan resin composition to parts other than the existing pipe can be prevented.

(3) Reinforcing fiber substrate The reinforcing fiber substrate can be formed from reinforcing fibers such as glass fibers, carbon fibers, aramid fibers, inorganic fibers, organic fibers, whiskers, or combinations thereof. Among these, glass fibers are preferably used in consideration of the balance between strength and price of the fiber-reinforced resin layer obtained. The reinforcing fiber preferably has a fiber diameter of 3 to 30 μm, and more preferably a fiber diameter of 5 to 25 μm from the viewpoint of strength and price.
The reinforcing fiber substrate preferably has a thickness of 0.5 mm or more, and preferably has a thickness of 1.0 mm or more. Thereby, sufficient protection characteristics can be expressed.

(Thermosetting furan resin composition)
The thermosetting furan resin composition preferably contains mainly a furan resin (A), a curing agent (B), and a core-shell type rubber polymer (C).

(1) Furan resin (A)
The furan resin (A) is preferably a furan resin or a modified furan resin.
The furan resin is a polymer starting from furfural or furfuryl alcohol or a precursor (oligomer) thereof. These may be used alone or in combination of two or more.
Polymers include furfuryl alcohol, furfuryl alcohol / furfural co-condensation, furfuryl alcohol / aldehyde co-condensation, furfural / ketone co-condensation, furfural / phenol co-condensation, furfuryl alcohol / urea co-condensation And a polymer such as furfuryl alcohol / phenol co-condensation type.

  Furan resin precursors include furfuryl alcohol, furfuryl alcohol / furfural co-condensation, furfuryl alcohol / aldehyde co-condensation, furfural / ketone co-condensation, furfural / phenol co-condensation, furfuryl alcohol / urea. Examples thereof include oligomers such as co-condensation type and furfuryl alcohol / phenol co-condensation type.

Although any kind can be used as the furan resin (A), a furfuryl alcohol type, furfuryl alcohol / formaldehyde co-condensation type polymer or precursor is preferable because it is stably supplied industrially. .
The furan resin may be a modified product thereof, and examples thereof include furan resins such as epoxy modification, phenol modification, aldehyde modification, urea modification, and melamine modification.

  When the thermosetting furan resin composition is cured, the furan resin (A) preferably has a moisture content of 10% by weight or less in order to minimize dimensional shrinkage due to moisture dissipation. Hereinafter, 5% by weight or less, 3% by weight or less are more preferable, and 2% by weight or less, and 1% by weight or less are more preferable.

(2) Curing agent (B)
The curing agent (B) is not particularly limited as long as it can cure the furan resin (A), and examples thereof include inorganic acids and organic acids. These may be used alone or in combination of two or more.
Examples of inorganic acids include hydrochloric acid and sulfuric acid.
Organic acids include xylene sulfonic acid, toluene sulfonic acid, phenol sulfonic acid, p-toluene sulfonic acid, benzene sulfonic acid, methane sulfonic acid and other organic sulfonic acids; malonic acid, succinic acid, maleic acid, oxalic acid, acetic acid, lactic acid And organic carboxylic acids such as malic acid, tartaric acid, benzoic acid and citric acid. Further, it may be an ammonium salt or an amine salt.

Ammonium salts and amine salts are stabilized by the formation of an amine compound by reacting ammonia or amine dissociated by heating with formaldehyde contained in a slight amount in the furan resin during heat curing. Further, the acid component is liberated and the furan resin is rapidly cured by the free acid. Therefore, it is possible to achieve both shortening of the curing time and prolonging the pot life.
Examples of the ammonium salt include ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium acetate, and ammonium bromide.
Examples of the amine salt include hydrochlorides such as methylamine hydrochloride, dimethylamine hydrochloride, ethylamine hydrochloride and diethylamine hydrochloride, and mineral salts such as sulfate.
The ammonium salt and amine salt are preferably dissolved or dispersed in a diluent to facilitate addition and dispersion to the furan resin. Diluents include alcohols such as water, methanol, and furfuryl alcohol.

  The content of the curing agent can be appropriately adjusted depending on the furan resin (A), the type and dilution concentration of the curing agent, the target curing temperature and curing time, and the like. For example, 0.1-15 weight part is preferable with respect to 100 weight part of furan resin, and 0.3-10 weight part is more preferable. By setting in this range, pot life can be ensured without causing poor curing.

(3) Core-shell type rubber polymer (C)
The core-shell type rubber polymer has a shell layer and a core layer. The core-shell type rubber polymer is preferably dissolved or dispersed in a diluent in order to facilitate addition and dispersion to the furan resin (A). Diluents include alcohols such as water, methanol, and furfuryl alcohol.

  The polymer as the main component of the shell layer is preferably in a glass state at 20 ° C. The shell layer may be composed only of a polymer that is in a glass state at 20 ° C. Moreover, it is preferable that the polymer used as the main component of a shell layer is a glassy polymer which has a hydroxyl group. In particular, the shell layer is preferably composed of only a glassy polymer having a hydroxyl group and a glassy state at 20 ° C.

  In particular, the polymer that is the main component of the shell layer is preferably one that is in a glass state at the temperature when added to the furan resin. The polymer as the main component of the shell layer preferably has moderate wettability with respect to the furan resin before curing. Examples of the polymer as the main component of the shell layer include acrylic polymers and acrylic-epoxy copolymers, and alkyl methacrylate polymers are particularly preferable.

The polymer as the main component of the core layer is in a rubber state at 20 ° C. The core layer may be composed only of a polymer that is in a rubbery state at 20 ° C.
The polymer as the main component of the core layer is preferably in a rubber state at the temperature when added to the furan resin. Examples of the polymer as the main component of the core layer include acrylic rubber and butadiene rubber, and alkyl acrylate polymers are particularly preferable.

  The addition amount of the core-shell type rubber polymer is not particularly limited, but is preferably 1 to 20 parts by weight with respect to 100 parts by weight of the furan-based resin (A) from the viewpoint of adjusting according to the intended seismic performance. 10 parts by weight is more preferable. By setting it as this range, while being able to obtain seismic performance with seismic performance, high intensity | strength can be maintained.

(4) Other components The thermosetting furan resin composition further comprises a reactive diluent, an inorganic filler, an anti-crystallization agent, an inorganic additive, a plasticizer, a foam stabilizer, a reactive diluent, and moisture trapping. An agent or the like may be contained. These may be used alone or in combination of two or more.

As the reaction diluent and the inorganic filler, those described in International Publication No. 2011/125534 can be used. Moreover, you may use the filler and inorganic type filler of Unexamined-Japanese-Patent No. 2014-104719.
Examples of the crystallization inhibitor include a resol type phenol resin, a melamine resin, a urea resin, and the like. The crystallization inhibitor has, for example, a viscosity (25 ° C.) of about 1000 to 50000 mPa · s, a water content of about 1 to 20% by weight and / or a formaldehyde content of about 0.1 to 15% by weight. Is preferred. The crystallization inhibitor can be used, for example, in an amount of 0.05 to 10 parts by weight with respect to 100 parts by weight of the furan resin. By setting this range, an appropriate viscosity can be obtained.

  The inorganic additive is preferably a water-soluble compound. For example, sodium chloride, lithium chloride, sodium bromide, lithium bromide, etc. are mentioned. Here, the water-soluble property is not limited so long as it is soluble in water, but it is preferable that the amount of the compound dissolved in 100 g of water at 20 ± 5 ° C. is 1 g or more. As for content of an inorganic type additive, 0.2-10 weight part is preferable with respect to 100 weight part of furan resins, for example. By setting to this range, a sufficient dimensional change preventing effect can be obtained, and the thermosetting furan resin composition can be adjusted to an appropriate viscosity.

Examples of the plasticizer include phthalic acid esters such as diethyl phthalate and dibutyl phthalate, phosphoric acid esters, fatty acid esters, and epoxy plasticizers.
Examples of the foam stabilizer include castor oil, castor oil derivatives, polysiloxane compounds, and polyoxyethylene sorbitan fatty acid esters. These may be used alone or in combination of two or more.
Examples of the moisture scavenger include those capable of trapping moisture by hydration of inorganic salts (anhydrous sodium sulfate, anhydrous magnesium sulfate, anhydrous copper sulfate, calcium chloride, etc.) or those capable of trapping moisture by adsorption at intramolecular pores ( Silica gel, molecular sieve, zeolite, etc.). The content of the moisture scavenger is preferably 1 to 100 parts by weight with respect to 100 parts by weight of the furan resin, for example.

(5) Preparation of thermosetting furan resin composition The thermosetting furan resin composition is prepared by adding the core-shell type rubber polymer (C) to the furan resin (A), stirring, and further curing agent (B). It can be obtained by optionally adding other components and stirring. The order in which the core-shell type rubber polymer (C), the curing agent (B) and other components are added to the furan resin (A) is not particularly limited, and all may be added simultaneously. In the obtained thermosetting furan resin composition, it is preferable that all of the above-described components are uniformly dispersed in the furan resin (A).

(6) Impregnation A method for impregnating the tubular lining material with the thermosetting furan resin composition is not particularly limited. For example, a method for impregnating an unimpregnated tubular lining material with an impregnation roll into an unimpregnated tubular lining material. Etc.

[Rehabilitation method for existing pipes]
The existing pipe rehabilitation method mainly includes the step of impregnating the tubular lining material with the thermosetting furan resin composition, the step of inserting the tubular lining material into the existing tube, and the state where the inserted tubular lining material is pressed against the inner wall of the existing tube. And the step of curing the impregnated thermosetting furan resin composition to coat the inner wall of the existing pipe.

(Impregnation of thermosetting furan resin composition into tubular lining material)
Impregnation of the thermosetting furan resin composition into the tubular lining material can be performed as described above. However, the tubular lining material and the thermosetting furan resin composition are respectively prepared on the spot, and the thermosetting furan resin composition may be impregnated into the tubular lining material, or on-site, that is, tubular to the existing pipe The impregnation may be performed immediately before the lining material is inserted, or in some cases after the tubular lining material is inserted into the existing pipe.

(Insertion of tubular lining material into existing pipe)
The tubular lining material can be inserted into the existing pipe by any of the following steps.
(i) Pull the tubular lining material into the existing pipe and insert it,
(ii) inserting the tubular lining material while being inverted into the existing pipe by fluid pressure,
(iii) The first tubular lining material is drawn and inserted into the existing pipe, and the second tubular lining material is inserted inside the first lining material while being inverted by fluid pressure.
In this case, it is preferable to insert the tubular lining material impregnated with the thermosetting furan resin composition into the existing pipe. However, particularly in the case of (iii), the first tubular lining material does not necessarily have to be impregnated with the thermosetting furan resin composition, and the thermosetting furan impregnated with the second tubular lining material. The resin composition may be transferred from the second tubular lining material to the first tubular lining material. By using such a method, leakage or contamination with the thermosetting furan resin composition impregnated in the tubular lining material can be prevented.

  When the tubular lining material is inserted into the existing pipe, a porous film may be disposed between the existing pipe and the tubular lining material. For example, first, a porous film may be inserted into an existing pipe, and a tubular lining material may be disposed inside the porous film, or a porous film may be disposed outside the tubular lining material and integrated. In this state, the porous film may be inserted so as to contact the inner wall of the existing pipe. A porous film is normally arrange | positioned on the surface on the opposite side to the water-impermeable film of a tubular lining material. As a porous film, the thing of Unexamined-Japanese-Patent No. 2014-104719 can be utilized.

The method for inserting the tubular lining material can be appropriately selected depending on the laminated structure.
For example, when the outermost layer of the tubular lining material is a water-impermeable film, as shown in FIG. 3, the tubular lining material is attached to the reversing device 4 on the ground near the manhole M1, and the lining is aligned with the rehabilitation section of the existing pipe. It is preferable to insert the material into the existing pipe while inverting the material.
As the reversing device, a known device used in this field can be used. When using a reversing device, by supplying a pressurized fluid from the reversing device, a uniform force is applied to the tubular lining material over a wide range while reversing from the tip side of the tubular lining material, and the diameter of the tubular lining material is sufficiently expanded. Thus, the tubular lining material can be inserted into the existing pipe.

  On the other hand, when the innermost layer of the tubular lining material is an impermeable film, it is preferable to draw the tubular lining material as it is into the existing pipe as shown in FIG.

  When there is a fluid such as sewage in the existing pipe, it is preferable to insert the tubular lining material after removing the fluid from the pipe line of the existing pipe. For example, as shown in FIG. 3, the fluid removing method is a damming member on the upstream side of manholes M1 and M2 (manhole M1 side in FIG. 3) provided in the pipes of the existing pipes at appropriate intervals. 3 and removing the fluid by flowing it downstream (M2 side). In the case where foreign matter such as deposits or pieces of wood exists in the existing pipe, it is preferable to clean the existing pipe with high-pressure water.

(Coating of inner wall of existing pipe)
After the tubular lining material is inserted into the existing pipe, the thermosetting furan resin composition is cured in a state where the tubular lining material is pressed against the inner wall of the existing pipe.
In order to press the tubular lining material against the inner wall of the existing pipe, a pressurized fluid is supplied to the inside of the tubular lining material, for example, using an inversion device or the like. Thereby, a uniform force can be applied to a wide range of the tubular lining material, and the diameter of the tubular lining material can be sufficiently expanded to press the tubular lining material against the inner wall of the existing pipe.
Curing is preferably performed by heating the thermosetting furan resin composition. Examples of the heating method include a method of sending warm water and a method of sending steam. As for the heating temperature at the time of thermosetting, 45-130 degreeC is preferable, for example.

  As described above, by curing the thermosetting furan resin composition, the tubular lining material firmly adheres to the existing pipe, while the pipe lining material hardens itself to produce a pipe equivalent to the existing pipe. The tube is rehabilitated.

In one embodiment, the existing pipe rehabilitation method can be performed as follows.
Ia: A thermosetting furan resin composition is produced by adding a curing agent (B) and a core-shell type rubber polymer (C) to a furan resin (A),
Ib: Injecting and impregnating the thermosetting resin composition obtained in the curable furan resin composition production step (Ia) into the unimpregnated tubular lining material,
Ic: Insert the tubular lining material obtained in the thermosetting furan resin composition production step (Ib) while being inverted into the existing pipe by fluid pressure,
Id: In a state where the tubular lining material inserted in the inversion step (Ic) is pressed against the inner wall of the existing pipe, the impregnated thermosetting resin composition is cured to cover the inner wall of the existing pipe.

In another embodiment, the existing pipe rehabilitation method may be performed as follows.
IIa: A thermosetting furan resin composition is produced by adding the curing agent (B) and the core-shell type rubber polymer (C) to the furan resin (A),
IIb: Injecting and impregnating the thermosetting resin composition obtained in the curable furan resin composition production step (Ia) into the unimpregnated tubular lining material,
IIc: The tubular lining material obtained in the tubular lining material impregnation step (IIb) is inserted into the existing pipe,
IId: Inside the tubular lining material inserted in the drawing step (IIc), a resin-absorbing substrate whose one surface is liquid-tightly film-coated is inserted while being inverted by fluid pressure,
IIe: impregnated in a state where the tubular lining material inserted in the drawing step (IIc) and the resin absorbing base material, on which the one surface inserted in the reversing step (IId) is liquid-tightly film-coated, are pressed against the inner wall of the existing pipe The thermosetting resin composition is cured to cover the inner wall of the existing pipe.

  The pipe rehabilitated by such an existing pipe rehabilitation method has an inner wall lined by a laminate including a cured product of a thermosetting resin composition and a base material. For this reason, the tensile breaking elongation is improved and the earthquake resistance is imparted without reducing the strength.

Hereinafter, embodiments of a lining material for rehabilitating an existing pipe and a method for rehabilitating an existing pipe of the present disclosure will be described with reference to the drawings.
(Lining material for existing pipe rehabilitation)
As shown in FIG. 1, the existing pipe rehabilitation lining material 1 includes a water-impermeable film 11, a first resin-absorbing base material 12, a first reinforcing fiber base material 13, a second material, The resin adsorbing substrate 14, the second reinforcing fiber substrate 15, and the third resin adsorbing substrate 16 are laminated in this order.

The lining material 1 for the existing pipe rehabilitation described above, when the inner wall of the existing pipe 2 to be repaired is lined, the impermeable film 11 and the first resin in order from the inside of the existing pipe 17 as shown in FIG. It arrange | positions at a cylinder shape so that it may become the absorption base material 12, the 1st reinforcement fiber base material 13, the 2nd resin adsorption base material 14, the 2nd reinforcement fiber base material 15, and the 3rd resin adsorption base material 16. The
The first resin-absorbing substrate 12, the first reinforcing fiber substrate 13, the second resin-adsorbing substrate 14, the second reinforcing-fiber substrate 15 and the third resin-adsorbing substrate 16 are connected to the existing pipe. The thermosetting resin is impregnated at the time of insertion, and after the rehabilitation, the thermosetting resin impregnated therein is hardened in a state of being in close contact with the inner wall of the existing pipe 17. In the existing pipe after rehabilitation, since the water-impermeable film 11 is arranged on the innermost side, the water-impermeable film 11 prevents the thermosetting resin from leaking out, and the thermosetting resin in the existing pipe. Unintentional contamination is prevented.

<Example 1>
A core-shell type rubber polymer (C) dispersion liquid (as a dispersion liquid) is added to 85 parts by weight of a furfuryl alcohol and formaldehyde cocondensate (viscosity at 25 ° C., 1830 mPa · s, moisture content 6.1% by weight). Using homodisper, 15 parts by weight of furfuryl alcohol and 20 parts by weight of metabrene SRK200 (manufactured by Mitsubishi Rayon Co., Ltd., 5 parts by weight of secondary particle diameter greater than 20 μm and 80 μm or less) as core-shell type rubber polymer) Stir at 1000 rpm for 5 minutes.
After stirring, 0.3 parts by weight of a 65% aqueous solution of paratoluenesulfonic acid and 13 parts by weight of a 40% aqueous solution of ammonium bromide were added as a curing agent (B), and further stirred at 1000 rpm for 5 minutes. Thus, a thermosetting furan resin composition was prepared.

Non-woven fabric (polyester non-woven fabric, porosity 85%, 460 g / m ² ) and non-woven fabric (polyester non-woven fabric, porosity 85%, 20 g / m ² ), which is the first resin-absorbing substrate 12 having an outer surface coated with a water-impermeable film 11 m ² ) laminate,
Glass fiber reinforced base material (plain weave, fiber diameter 17 μm, porosity 60%, 1700 g / m ² ), which is the first reinforced fiber base material 13;
Non-woven fabric (polyester non-woven fabric, porosity 85%, 180 g / m ² ) which is the second resin adsorption base material 14
Glass fiber reinforced base material (plain weave, fiber diameter 17 μm, porosity 60%, 1700 g / m ² ) as second reinforcing fiber base material 15 and non-woven fabric (polyester nonwoven fabric, porosity) as third resin adsorbing base material 16 1 was prepared by laminating 85%, 20 g / m ² ) in this order.

The inside of the tubular lining material was depressurized to degas the air in the tubular lining material.
The thermosetting furan resin composition obtained above was impregnated by injecting 7500 g / m ² into the degassed tubular lining material 1. Thereby, a tubular lining material 1 having a thickness of 4 mm was obtained.

As shown in FIG. 3, the obtained tubular lining material 1 is attached to a reversing device 4 installed on the ground in the vicinity of the manhole M2, and the buried lining 2 having an inner diameter of 250 mm is reversed while the tubular lining material 1 is reversed with compressed air. Inserted into.
Subsequently, the tubular lining material 1 inverted and inserted into the buried pipe 2 is heated from the inside at 50 ° C. for 1 hour, 60 ° C. for 1 hour, and 80 ° C. for 2 hours while being pressed against the inner wall of the buried pipe 2. The thermosetting furan resin composition was cured and the inner wall of the existing pipe was covered with a lining material. As a result, the buried pipe 2 was rehabilitated.

<Example 2>
A thermosetting furan resin composition was prepared in the same manner as in Example 1 except that 5 parts by weight of Metabrene C201A (manufactured by Mitsubishi Rayon Co., Ltd., secondary particle diameter greater than 80 μm and 500 μm or less) was used as the core-shell type rubber polymer. The buried pipe was rehabilitated.

<Example 3>
The thermosetting furan was used in the same manner as in Example 1 except that 5 parts by weight of staphyloid AC4030 (manufactured by Aika Kogyo Co., Ltd., secondary particle diameter larger than 1 μm and 20 μm or less) having a hydroxyl group in the shell layer was used as the core-shell type rubber polymer. A resin composition was prepared and the buried pipe was rehabilitated.

<Comparative Example 1>
A paratoluenesulfonic acid 65% aqueous solution as a curing agent (B) with respect to 100 parts by weight of a furan resin composed of furfuryl alcohol and formaldehyde cocondensate (viscosity at 25 ° C., 1830 mPa · s, moisture content 6.1% by weight). 0.3 parts by weight and 13 parts by weight of an aqueous 40% ammonium bromide salt solution were added and stirred at 1000 rpm for 5 minutes. Thus, a thermosetting furan resin composition was prepared.
Using the obtained thermosetting furan resin composition, the buried pipe was rehabilitated in the same manner as in Example 1.

The rehabilitation buried pipes obtained by Examples and Comparative Examples were evaluated as shown in Table 1. The evaluation results are shown in Table 1. The evaluation results in Table 1 and the viscosity and moisture content of the furan resin were measured by the following methods.
(1) Tensile elongation at break and tensile strength The rehabilitated buried pipes obtained in Examples and Comparative Examples were dumbbell cut in the axial direction and measured according to JIS K7117 “Plastics—Testing methods for tensile properties”.
(2) Impregnation The inside of the tubular lining material was depressurized to -0.095 Mpa, and the resin progress rate when the resin composition was impregnated was evaluated. The evaluation criteria are as follows.
◎: Resin traveling speed 0.5 m / min or more ○: Resin traveling speed 0.1 m / min or more △: Resin traveling speed 0.01 m / min or more (3) Viscosity JIS K7117-1 “Plastic-liquid, emulsion or It was measured in accordance with “Dispersed Resin—Measurement Method of Apparent Viscosity Using Brookfield Rotational Viscometer”.
(4) Water content Measured according to the quantitative titration method in JIS K0113-8 “Karl Fischer titration method”.

  As is clear from Table 1, the tensile strength and the tensile elongation at break can be improved by adding the core-shell type rubber polymer (C) in comparison with Examples 1, 2, and 3 and Comparative Example 1. confirmed. Furthermore, it is confirmed that the smaller the secondary particle diameter, the better the impregnation property, and the shell layer has a hydrophilic group such as a methacrylic acid copolymer, so that the tensile strength is greatly improved. It was. Therefore, it became clear that the lining material in the examples of the present application has a high tensile fracture elongation and realizes a lining material for existing pipe rehabilitation that is very excellent in earthquake resistance, and can implement a good existing pipe rehabilitation method.

  The present disclosure provides a lining for rehabilitating existing pipes such as water pipes, sewer pipes, agricultural water pipes, gas pipes and other existing pipes embedded in the ground. It is industrially useful as a material and existing pipe rehabilitation method using it.

DESCRIPTION OF SYMBOLS 1 Tubular lining material 2 Existing pipe 3 Damping member 4 Reversing device M1, M2 Manhole 11 Water-impermeable film 12 1st resin absorption base material 13 1st reinforcement fiber base material 14 2nd resin adsorption base material 15 2nd Reinforcing fiber substrate 16 Third resin adsorbing substrate

Claims (8)

Tubular lining material;
A lining for existing pipe rehabilitation comprising a thermosetting furan resin composition containing a furan resin (A), a curing agent (B) and a core-shell type rubber polymer (C) impregnated in the tubular lining material. Wood.   The said core-shell type rubber polymer (C) contains the polymer used as the main component of the shell layer which is a glass state at 20 degreeC, and the polymer used as the main component of the core layer which is a rubber state at 20 degreeC. Lining material for existing pipe rehabilitation.   The lining material for existing pipe rehabilitation according to claim 1 or 2, wherein the core-shell type rubber polymer (C) is a glassy polymer having a shell layer having a hydroxyl group.   The lining material for existing pipe rehabilitation according to any one of claims 1 to 3, wherein 90% by weight or more of the core-shell type rubber polymer (C) has an outer diameter of 20 µm or less. The tubular lining material is
A tubular lining material in which an impermeable film, a first resin-absorbing substrate, a reinforcing fiber substrate, and a second resin-adsorbing substrate are laminated in this order;
A tubular lining material in which an impermeable film, a first resin-absorbing substrate and a second resin-absorbing substrate are laminated in this order;
The tubular lining material comprising the first resin-absorbing base material or the tubular lining material obtained by laminating the first resin-adsorbing base material and the first reinforcing fiber base material. Lining material for existing pipe rehabilitation as described in 1. An existing pipe rehabilitation method for covering an inner wall of an existing pipe with the existing pipe rehabilitation lining material according to any one of claims 1 to 5,
Impregnating the tubular lining material with the thermosetting furan resin composition;
The step of inserting the tubular lining material into the existing pipe, and the impregnated thermosetting furan resin composition is cured by pressing the inserted tubular lining material against the inner wall of the existing pipe, and the existing pipe. A method for rehabilitating an existing pipe, comprising a step of covering the inner wall of the pipe. The step of inserting the tubular lining material into the existing pipe,
Pull the tubular lining material into the existing pipe and insert it,
Insert the tubular lining material while reversing it into the existing pipe by fluid pressure,
The first tubular lining material is either drawn into an existing pipe and inserted, and the second tubular lining material is inserted inside the first lining material while being inverted by fluid pressure. Rehabilitation method for existing pipes.   The existing pipe according to claim 6 or 7, wherein the step of inserting the tubular lining material into the existing pipe is a step of inserting the tubular lining material impregnated with the thermosetting furan resin composition into the existing pipe. Rehabilitation method.