JP6095278B2 - Existing pipe repair method - Google Patents

Description

  The present invention relates to an existing pipe repairing method in which an inner layer pipe is formed by covering a tubular photocurable lining material on the inner peripheral surface of an existing pipe.

  Existing pipes such as sewage pipes deteriorate with long-term use, and their useful life is generally about 50 years. Therefore, existing pipes that have exceeded the useful life are increasing year by year. In particular, it is inevitable that the sewer pipes buried in the ground are subject to various deformations due to ground fluctuations, such as generation of steps due to displacement and changes in diameter. In addition, even if no deformation occurs, it is necessary to repair, renovate, or replace with aging, and because of these various circumstances, existing pipes need to be repaired at certain times. is there.

  As a method for repairing existing pipes such as sewage pipes, for example, repair methods for forming an inner layer pipe with a lining material using a thermosetting resin or a photo-curing resin are known (Patent Documents 1 and 2).

  In the repair method using the thermosetting lining material described in Patent Document 1, after introducing the uncured thermosetting optical lining material into the existing pipe in a folded state, both ends are sealed with a sealing member, and compressed air The diameter of the pipe is expanded from the folded state so as to be in close contact with the inner peripheral surface of the existing pipe, and then, by supplying a heating fluid, the polymerization crosslinking reaction of the thermosetting resin is started and cured, and the inner peripheral surface of the existing pipe is cured. Is covered with a hardened lining material (inner layer pipe).

  On the other hand, in the repair method using the photocurable lining material described in Patent Document 2, after the uncured photocurable lining material is introduced into the existing pipe in a folded state, both ends are sealed with a sealing member and compressed. From the state of being folded by supplying air, the diameter of the light-curing resin is increased by bringing the light-irradiating device into contact with the inner peripheral surface of the existing pipe and then irradiating the light while moving the light irradiation device inside the light-curing lining material A polymerized crosslinking reaction is started and cured, and a cured lining material (inner layer pipe) is applied to the inner peripheral surface of the existing pipe.

  In the existing pipe repair method using thermosetting lining material, the heating fluid is introduced into the sealed lining material and cured at a stretch, so the curing shrinkage is large, and there is a gap between the cured lining material and the existing pipe. May occur. Moreover, there is a possibility that the heat treatment cannot be smoothly performed due to the influence of groundwater flowing in from the cracks of the existing pipe.

  On the other hand, in the existing pipe repair method using the photo-curing lining material, the light irradiation device is moved from one end portion of the lining material toward the other end portion, and the inner peripheral surface of the existing pipe is sequentially adhered and cured. Therefore, the shrinkage due to the hardening of the lining material is small, and it is not affected by the groundwater, so that a high quality inner layer pipe that is satisfactorily covered on the inner peripheral surface of the existing pipe can be obtained. As the light irradiation device, a lamp assembly in which a plurality of lamps are connected in series is generally used.

JP 09-123279 A JP2009-214407

  However, in the repair method using a photo-curing lining material, light irradiation tends to be performed excessively at the actual site so that curing failure of the lining material does not occur, which increases the time required for irradiation work. There is a problem that the efficiency of work decreases.

  Also, during light irradiation, the temperature of the photocurable lining material may rise excessively during the construction process due to heat generated from the light irradiation device itself and heat generated from the polymerization / crosslinking reaction that is an exothermic reaction. is there. If the temperature rises excessively, the material of the photocurable lining material itself deteriorates, and there is a problem that the strength of the cured lining material that is the inner tube is insufficient.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an existing pipe repair method in which an appropriate curing reaction of a photocurable lining material is performed and the efficiency of a curing operation can be improved. There is to do.

In order to solve the above problem, the existing pipe repair method according to claim 1 is:
Introducing a tubular photocurable lining material into an existing pipe, and introducing and arranging the introduced photocurable lining material to expand along the inner peripheral surface of the existing pipe; and inside the photocurable lining material An existing pipe repairing method including a light irradiation step of irradiating light to the photocurable lining material while moving a light irradiation device,
The existing pipe is a sewer pipe,
The photocurable lining material includes a photocurable resin composition containing an unsaturated polyester resin or vinyl ester resin, styrene and a photopolymerization initiator,
The content of the styrene is 25 to 40% by mass with respect to the mass of the entire photocurable resin composition,
The photocurable resin composition is contained in the photocurable lining material in a state where the fiber base material is impregnated, and a weight ratio of the fiber base material to the photocurable resin composition (fiber base material: light). Curable resin composition) is 45:55 to 55:45,
Content of the said photoinitiator is 0.5-5 mass% with respect to the mass of the said whole photocurable resin composition,
The light irradiation step is performed such that radiant energy generated from the light irradiation device is 0.05 to 0.25 J / mm ³ per unit volume of the photocurable lining material,
The radiant energy E _V (J / mm ³ ) per unit volume and the tube thickness t (mm) of the photocurable lining material are expressed by the following formula (I):

(However, A is 0.30 to 0.55, and B is -0.95 to -0.65.)
Satisfy the relationship
  The radiant energy E determined according to the tube thickness of the photocurable lining material according to the formula (I) _V The light irradiation step is performed within the range of.

Since the degree of curing reaction of a tubular photo-curing lining material varies depending on the tube thickness, if light irradiation is performed so that the radiation energy by the light irradiation device is in the above range in consideration of the volume of the photo-curing lining material, light An appropriate curing reaction of the curable lining material is performed, and the work efficiency is improved accordingly. Specifically, when the temperature is lower than the above range, a sufficient curing reaction is not performed, and when it is higher than the above range, light is excessively irradiated, and the material of the cured lining material itself deteriorates.

In particular, when a photo-curing lining material having a thin tube thickness is used in the past, polymerization / crosslinking reaction is unintentionally promoted by the influence of heat generated from the light irradiation device itself, resulting in excessive irradiation. However, according to the above configuration, a curing reaction suitable for a thin lining material that is easily affected by heat is performed.

Therefore, if the curing operation according to the above configuration is performed, a good quality post-curing lining material (inner layer pipe) is formed on the inner peripheral surface of the existing pipe by an efficient curing operation, and a high repair effect can be obtained. According to this configuration, the thinner the tube thickness of the photocurable lining material, the radiant energy E per unit volume. _V The light irradiation process is performed so as to increase the amount. This is because in order to cure the photocurable lining material, it takes a certain time from the start of light irradiation until the photopolymerization reaction starts. That is, after irradiating for a certain period of time until the start of the photopolymerization reaction, the time from the start of the polymerization reaction to the end immediately ends without depending on the tube thickness. Therefore, the optimum energy for photocuring is given by irradiating light so that the radiation energy per unit volume is relatively larger when the tube thickness is thinner than when the tube thickness is thick. The above characteristic configuration has been found based on this point, thereby further improving the efficiency of the curing operation.

The existing pipe repair method according to claim 2 is:
The light irradiation device is a lamp connection body having a configuration in which a plurality of light irradiation lamps are connected in series, and an output P per unit length in the connection direction of the lamp connection body. _A Is 0.5 to 4 W / mm.

As in this configuration, a wide range of areas on the inner peripheral surface of the photocurable lining material can be irradiated at once and uniformly by using the lamp assembly arranged in series. Also, the output P per unit length _A However, by using the lamp assembly in the above range, the irradiation per unit volume can be performed accurately and quickly.

The existing pipe repair method according to claim 4 is:
The light irradiation step is performed such that a radiation intensity by the light irradiation device is 0.0008 to 0.0046 W / mm ² .

  If the radiation intensity is lower than the above range, the curing reaction of the photo-curable lining material may not be sufficiently performed and the required strength may not be obtained. It can be significantly reduced. On the other hand, when the radiation intensity is higher than the above range, the inner surface layer of the lining material is excessively irradiated locally, so that the lining material may be deteriorated and the strength after curing may be lowered.

The existing pipe repair method according to claim 5 is:
The light irradiation step is performed such that radiant energy generated from the light irradiation device is 2.0 J / mm ² or less per unit area of the inner peripheral surface of the photocurable lining material. If the radiant energy per unit area is 2.0 J / mm ² or less, the photocuring reaction is more favorably performed.

The existing pipe repair method according to claim 6 is:
The length of the lamp connecting body in the connecting direction is 2500 to 6000 mm, and the lamp connecting body is moved at a speed of 2.5 to 20 mm / s. When the length and moving speed of the lamp assembly are within this range, a good photocuring reaction can be performed by a rapid light irradiation operation.

The existing pipe repair method according to claim 7 is:
The average interval between adjacent light irradiation lamps in the lamp assembly is 200 to 800 mm. According to this structure, a photocurable lining material can be uniformly irradiated without unevenness.

  According to the existing pipe repairing method according to the present invention, since the light irradiation process is performed in consideration of various forms of the light irradiation device and the photocurable lining material to be used, the photocurable lining material with high work efficiency and high quality. Can be formed, and a high repair effect can be secured.

It is the schematic explaining a mode that light irradiation is carried out after introduce | transducing a photocurable lining material in a sewer pipe. It is the schematic which shows an example of the lamp coupling body which is a light irradiation apparatus. It is a perspective view explaining the structure of a photocurable lining material. It is a graph which shows the relationship between the tube thickness of a photocurable lining material, and the radiant energy per unit volume.

  As described above, the existing pipe repair method according to the present invention introduces a tubular photocurable lining material into the existing pipe, and introduces the introduced photocurable lining material to expand the diameter along the inner peripheral surface of the existing pipe. And a light irradiation step of irradiating the photocurable lining material with light while moving the light irradiation device inside the photocurable lining material. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an installation state of the light irradiation device 12 in a sewer pipe 200 as an existing pipe to which the existing pipe repair method according to the present embodiment is applied. For the sake of simplification of the drawings, the illustration of an attachment pipe or the like coupled to the sewer pipe 200 for allowing rainwater or general drainage to flow into the lower pipe 200 is omitted. Also, for simplification of the drawings, the size of other constituent members with respect to the inner diameter and length of the sewer pipe 200 is not the same scale.

  In addition, the light irradiation apparatus 12 illustrated in this figure is configured by connecting six light irradiation lamps indicated by reference numerals 12a to 12f in series, and light irradiation on the right side indicated by a solid line in the figure. A state in which the apparatus is at a starting position, which is a position to start traveling, and a state in which the light irradiation apparatus 12 indicated by a broken line on the left side is located at an end point position that has arrived at the end on the opposite side are shown. Also, for the sake of clarity, the traveling legs and wheels provided in the light irradiation device 12 are omitted.

  Here, first, preparatory work for photocuring of the tubular photocurable lining material 100 will be described. As illustrated, a sewer pipe 200 that is an existing pipe to be repaired in this example is formed between vertical shafts 300 and 400 called so-called manholes. In performing the repair, as a preparation, a water stop member (not shown) is installed on the upstream side of the manhole 300 in order to block the upstream side of the sewer pipe 200. In the state shown in this figure, the photocurable lining material 100 has already been introduced into the sewer pipe 200, and the work of expanding the diameter along the inner peripheral surface of the sewer pipe 200 has also been completed. .

  The work of introducing the photocurable lining material 100 into the sewage pipe 200 can be performed by pulling the photocurable lining material 100 as it is, but with the uncured photocurable lining material 100 being reversed from the tip side. Inversion introduction or the like that pushes into the water pipe 200 is also preferably used.

  In addition, the above-described diameter expansion operation is performed by blowing shaping air into the photocurable lining material 100. For this purpose, the photocurable lining material 100 is sealed at both ends of the photocurable lining material 100. End packers 50 are attached respectively. Then, air is blown in from the end packer side at the end of the manhole 300, thereby increasing the pressure in the photocurable lining material 100, and the photocurable lining material 100 is in close contact with the inner peripheral surface of the sewer pipe 200. The diameter is expanded so as to.

  When the introduction and placement process of the photocurable lining material 100 is completed as described above, a light irradiation process by the light irradiation device 12 is performed thereafter. As illustrated, the light irradiation device 12 is pulled to the manhole 300 side by a pulling wire 800 from a position installed on the manhole 400 side end in the photocurable lining material 100. Travel in the direction of the arrow and move. Then, during the traveling, the photocurable lining material 100 is irradiated with light from the inside to be cured. In the light irradiation device 12, the light emitting portion moves in the axial direction around the center of the photocurable lining material.

What is characteristic in the present invention is that the radiant energy generated from the light irradiation device 12 is 0.05 to 0.25 J / mm ³ , preferably 0.05 to 0.22 J / per unit volume of the photocurable lining material 100. It is to perform a light irradiation process so that it may become mm < ³ >.

  If light irradiation is performed so that the radiation energy per unit volume is in the above range in consideration of the volume of the photocurable lining material, the light irradiation becomes excessive or insufficient due to the difference in the tube thickness of the photocurable lining material. Can be avoided.

  In particular, when a photocurable lining material having a thin tube thickness is used in the past, polymerization / crosslinking reaction is unintentionally promoted by the influence of heat generated by the light irradiation device itself, resulting in excessive irradiation. However, by setting the radiant energy per unit volume in the upper range, a curing reaction suitable for a thin lining material that is easily affected by heat is performed.

  The radiant energy per unit volume of the photocurable lining material generated from the light irradiation device is obtained by the following formula (II).

In the formula (II), E _V is radiant energy per photocurable lining unit volume generated by the light irradiation device (J / mm ^3), P is the output of the light irradiation device (W), phi photocurable The inner diameter (mm) of the lining material in an expanded state, t is the tube thickness (mm) of the photocurable lining material, v is the moving speed (mm / s) of the light irradiation device, and π is the circumference ratio.

In the present invention, preferably, the radiation energy E _V (J / mm ³ ) per unit volume of the photocurable lining material and the tube thickness t (mm) of the photocurable lining material are expressed by the following formula (I):

(However, A is 0.30 to 0.55, and B is -0.95 to -0.65.)
It satisfies the relationship, performing light irradiation step in the range of the radiant energy E _V obtained according to the tube thickness of the photocurable lining material according the formula (I).

  Thereby, it irradiates so that the radiation energy per unit volume may increase, so that the pipe | tube thickness of a photocurable lining material is thin. That is, a photocuring reaction suitable for the actual situation is performed by appropriately selecting the required radiant energy depending on the difference in the tube thickness of the photocurable lining material.

In the present invention, more preferably, perform the light irradiation step, the radiation intensity of the light irradiation device 0.0008~0.0046W / mm ^2, so preferably a 0.001~0.004W / mm ² .

  If the radiant intensity is lower than the above range, the curing reaction of the photo-curable lining material may not be sufficiently performed, and the strength required for repair may not be obtained. It can be significantly reduced. On the other hand, when the radiation intensity is higher than the above range, the inner surface layer of the lining material is excessively irradiated locally, so that the lining material may be deteriorated and the strength after curing may be lowered.

  In the present invention, the radiation intensity of the light irradiation device is obtained by the following formula (III).

In this formula (III), R is the radiation intensity (W / mm ² ), P is the output (W) of the light irradiation device, φ is the inner diameter (mm) of the photocurable lining material in an expanded state, and L is the light irradiation. The length (mm) in the connecting direction of the lamp assembly as a device, and π is the circumference.

In the present invention, preferably, in the light irradiation step by the light irradiation device 12, the radiant energy generated from the light irradiation device 12 is 2.0 J / mm ² or less per unit area of the inner peripheral surface of the photocurable lining material 100. Preferably, it carries out so that it may become 0.3-1.3 J / mm < ² >. If it is this range, as shown in the Example mentioned later, a poor hardening and deterioration of a material do not arise, but the inner-layer pipe | tube hardened | cured favorably is obtained.

  The radiant energy per unit area of the inner peripheral surface of the photocurable lining material is obtained by the following formula (IV).

In the formula (IV), E _A is the radiant energy per unit area (J / mm ² ) of the inner peripheral surface of the photocurable lining material generated from the light irradiation device, P is the output (W) of the light irradiation device, φ is the inner diameter (mm) of the photocurable lining material in an expanded state, v is the moving speed (mm / s) of the light irradiation device, and π is the circumference.

  The output P in the above formulas (II), (III) and (IV) refers to the radiant energy per unit time radiated from the light irradiating device, and this radiant energy includes light required for the photopolymerization reaction (particularly, In addition to energy (wavelength 200 to 800 nm), energy such as infrared rays radiated as secondary energy and thermal energy generated by the light irradiation device itself are also included. Thermal energy also affects the photopolymerization reaction, taking into account that the photopolymerization reaction is accelerated as the temperature of the photocurable lining material increases. Since the power consumption (W) required for light irradiation of the light irradiation device is usually almost entirely converted into light or thermal energy, the output P (W) is substantially the same as the power consumption (W). .

  As the light irradiation device, a light source that emits light in the ultraviolet to visible light region (usually a wavelength of 200 to 800 nm) can be used. A metal halide lamp such as a gallium lamp, a mercury lamp, a chemical lamp, a xenon lamp, a halogen lamp, or a mercury lamp. A halogen lamp, a carbon arc lamp, an incandescent lamp, a laser beam, etc. are mentioned, The lamp which can irradiate the light of the wavelength corresponding to the absorption wavelength of the photoinitiator mentioned later is selected suitably. In the present invention, an ultraviolet and / or visible light irradiation device having a peak wavelength in the wavelength region of 350 to 450 nm is particularly preferable, and a gallium lamp is particularly preferable in that curing is performed satisfactorily.

  Moreover, it is preferable that a light irradiation apparatus is a lamp | ramp coupling body comprised by connecting several light irradiation lamps in series. An example of the lamp assembly is shown in FIG. As shown in the drawing, a plurality of (in this example, 12) light irradiation lamps 62 are connected in series by a cable or the like to form a lamp connecting body 60, and a pulling wire 64 is provided at the tip of the lamp connecting body 60. It is connected. The lamp coupling body 60 is provided with a plurality of leg portions 66 so as to extend radially outward of the photocurable lining material 100 in the arrangement state, and a wheel 68 is provided at the tip of the leg portion 66. Yes. The leg portion 66 and the wheel 68 enable the light emitting portion of the lamp coupling body to move in the axial direction around the center portion of the photocurable lining material.

  The length of the lamp connecting body 60 in the connecting direction (the length from the front end to the rear end) is, for example, 2500 to 6000 mm, preferably 2800 to 5000 mm. In the present invention, the lamp assembly is preferably moved at a speed of 2.5 to 20 mm / s, particularly 7 to 20 mm / s. Within these ranges, a rapid curing operation can be performed.

Moreover, it is preferable that the average space | interval of the light irradiation lamp 62 which adjoins each lamp coupling body 60 is 200-800 mm, for example, especially 300-600 mm. Thereby, a photocurable lining material can be uniformly irradiated without unevenness. The average interval can be obtained by dividing the above-mentioned length in the connecting direction of the lamp assembly by the number of light irradiation lamps. Indeed the length of the longitudinal direction of the light source portion where light is emitted in the light irradiation lamp 62 is 50~500mm example, suitably selected in accordance with the mean spacing and the following output P _A.

Further, the output P _i of the light irradiation lamp 62 alone is preferably 500 to 1200 W. The number of light irradiation lamps to be connected is usually 5 to 15. Therefore, the output P of the entire light irradiation device (lamp connection body) in which a plurality of light irradiation lamps are connected is usually 2500 W to 18000 W, preferably 3600 W to 12000 W. The output P can be appropriately selected according to the inner diameter φ and the tube thickness t when the photocurable lining material is expanded.

Further, the lamp connecting member 60 preferably outputs P _A is 0.5 to 4 W / mm per unit length of the connecting direction of the lamp connecting member 60, preferably constructed such that the 1~2.5W / mm To do. Thereby, the wide area | region of the internal peripheral surface of a photocurable lining material can be irradiated uniformly at once, and the light irradiation per unit area or unit volume mentioned above can be performed rapidly. Output P _A per unit length of the lamp connecting body is determined by dividing the output P of the entire lamp connection body in the length of the connecting direction of the lamp connecting member.

  When a light irradiation apparatus is the said light irradiation lamp coupling body, it is preferable to be able to control so that each can be lighted on and off independently. In particular, in the light irradiation lamp assembly, the irradiation amount is reduced at both ends of the photocurable lining material introduced into the existing pipe and in the vicinity thereof, compared to other portions, and the irradiation amount may be uneven. Therefore, it is possible to irradiate light with a constant irradiation amount at any location by controlling turning on and off.

  After irradiating light as described above over the entire range of the photocurable lining material 10 introduced into the sewer pipe, the light irradiation device and the packer are pulled up to the ground, and then the pipe ports at both ends of the cured lining material 10 The repair is completed by appropriately performing the processing.

  FIG. 3 is a schematic perspective view showing an example of a photocurable lining material used in the present invention. As shown in the figure, the photocurable lining material 100 basically has a three-layer structure. That is, the photocurable layer 32 is a base of the photocurable lining material 100, and a cylindrical fiber base material (such as roving cloth or chop strand mat) such as glass fiber mat or felt is impregnated with the photocurable resin composition. And an outer film 34 provided on the outer side of the photocuring layer 32 and an inner film 36 provided on the inner side of the photocuring layer 32.

  The inner film 34 and the outer film 36 are appropriately provided to prevent adhesion to other objects due to the adhesiveness of the photocurable resin before curing, for example, a polyethylene film, a polypropylene film, a polyurethane film. Etc. As the inner film 34, a film (which may be the above-described example film) that transmits at least light irradiated from a light irradiation device is used. As the outer film 36, light irradiated from the light irradiation device is a photocurable lining. It is preferable to use a light-shielding film so that it does not transmit to the outside of the material and is used for the photocuring reaction as much as possible. As the light shielding film, a laminated film having a colored coating layer of yellow or the like between two transparent polyethylene films can be used.

  The weight ratio of the fiber base material and the impregnated photocurable resin composition in the photocurable layer 32 (fiber base material: photocurable resin composition) is, for example, 45:55 to 55:45. When the weight ratio is within this range, a sufficient photocuring reaction is performed with the radiant energy within the above range.

  The thickness of the photo-curing layer 32 may be appropriately selected depending on the diameter of the existing pipe to be repaired, the pipe thickness, the degree of deterioration, and the like, for example, 2 to 20 mm. The photocurable lining material is stored in a folded state before use, and after being introduced into an existing pipe, the diameter is expanded in a circular shape by a fluid such as steam. The expanded inner diameter φ is, for example, 200 to 1000 mm, and is appropriately selected according to the size of the existing pipe to be repaired. The inner film 34 is appropriately peeled and removed after the photocured layer 32 is cured.

  The photocurable resin composition contained in the photocurable lining material 100 includes a polymerizable resin, a polymerizable unsaturated monomer, and a photopolymerization initiator. As the polymerizable resin, an unsaturated polyester resin, a vinyl ester resin, or the like can be used.

  As the unsaturated polyester resin, an unsaturated polyester obtained by an esterification reaction of an α, β-unsaturated carboxylic acid and a polyhydric alcohol can be used. A saturated carboxylic acid may be included in addition to the α, β-unsaturated carboxylic acid.

  Examples of the α, β-unsaturated carboxylic acid include fumaric acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, mesaconic acid, chloromaleic acid, and dimethyl esters thereof. These α, β-unsaturated carboxylic acids may be used alone or in combination of two or more. Examples of saturated carboxylic acids that can be used include phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, hetic acid, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, adipic acid, and sebacic acid. These saturated carboxylic acids may be used alone or in combination of two or more.

  On the other hand, as the polyhydric alcohol, for example, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,3- Propanediol, 1,6-hexanediol, cyclohexanediol, neopentyl glycol, 2,2,4-trimethyl-1,3-pentanediol, 1,4-cyclohexanedimethanol, hydrogenated bisphenol A, Examples include diols such as alkylene oxide adducts of hydrogenated bisphenol A, triols such as trimethylolpropane, and tetraols such as pentaerythritol. These polyhydric alcohols may be used alone or in combination of two or more.

  As the vinyl ester resin, an ester compound obtained by adding a monocarboxylic acid having a polymerizable unsaturated bond in the molecule to an epoxy resin can be used. The vinyl ester resin may be a pure product or may be diluted with a polymerizable monomer such as styrene.

  Examples of the epoxy resin include bisphenol A diglycidyl ether, tetrabromobisphenol A diglycidyl ether, resorcinol diglycidyl ether, diglycidyl phthalate, novolac glycidyl ether, diglycidyl phthalate, tetraglycidyl-m-phenylenediamine, etc. Is mentioned. Examples of the monocarboxylic acid include acrylic acid or methacrylic acid.

  The polymerizable resin such as the unsaturated polyester or vinyl ester resin is used as a solution dissolved in the unsaturated polymerizable monomer. Examples of unsaturated polymerizable monomers include aromatic vinyl monomers such as styrene, vinyl toluene, and α-methyl styrene; and methacrylate monomers such as methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, and 2-ethylhexyl methacrylate. Can do. These unsaturated polymerizable monomers may be used alone or in combination of two or more. Generally, styrene is used. The unsaturated polymerizable monomer is generally used in an amount of 25 to 40% by mass with respect to the mass of the entire photocurable resin composition.

  As the photopolymerization initiator, a known ultraviolet polymerization initiator and / or visible light polymerization initiator can be used. Examples of ultraviolet polymerization initiators include benzoin ether-based isopropyl benzoin ether, isobutyl benzoin ether, benzoin ethyl ether, benzoin methyl ether, benzyl ketal-based hydrocyclohexyl phenyl ketone, benzyl dimethyl ketal, ketone benzophenone-based benzyl, methyl- O-benzoinbenzoate, 2-chlorothioxanthone, methylthioxanthone, benzophenone-based benzophenone / tertiary amine, 2,2-diethoxyacetophenone, α-hydroxyisobutylphenone, acylophosphine oxide, bisacylphosphine oxide, camphorquinone, etc. These can be given as representative examples, and these can be used alone or in combination.

  An acylphosphine oxide compound is effective as a visible light polymerization initiator. Examples include bis (2,6-dichlorobenzoyl) -phenylphosphine oxide, bis (2,6-dichlorobenzoyl) -2,5-dimethylphenylphosphine oxide, bis (2,6-dichlorobenzoyl). -4-ethoxyphenylphosphine oxide, bis (2,6-dichlorobenzoyl) -4-propylphenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2,4,4-trimethylpentylphosphine oxide, 2,4 , 6-trimethylbenzoyl-diphenylphosphine oxide and the like can be used alone or in combination.

  A photopolymerization initiator having absorption of 250 nm in the ultraviolet wavelength region to 450 nm in the visible wavelength region is preferable. The usage-amount of a photoinitiator is 0.01-10 mass% with respect to the mass of the whole photocurable resin composition, Preferably it is the range of 0.5-5 mass%. If it is less than 0.01% by mass, the polymerization may not be sufficiently performed, and if it is 10% by mass or more, the curing time is almost flat.

  Hereinafter, the present invention will be described by way of examples.

1. Production of photocurable lining material 68 parts by mass of an unsaturated polyester resin, 30 parts by mass of a polymerizable vinyl monomer (styrene) and 2 parts by mass of a photopolymerization initiator were stirred and mixed to obtain a photocurable resin composition.

First, a 0.2 mm thick light-shielding film (outer film: a laminated film having a yellow coating layer between two transparent polyethylene films) is laid, and a 600 g / m ² roving cloth ERW580-554A (glass fiber, centralized film) Glass (manufactured by Glass Co., Ltd.) and then impregnated with the above-mentioned photo-curable resin composition, and then 600 g / m ² of chop strand mat ECM600-501 (glass fiber, manufactured by Central Glass Co., Ltd.) as an intermediate layer. Then, the above-mentioned photo-curable resin composition is impregnated in the same manner, and 600 g / m ² of roving cloth ERW580-554A (glass fiber, manufactured by Central Glass Co., Ltd.) is layered thereon again, and the above-mentioned photo-curing is performed thereon. The impregnated resin composition was impregnated in the same manner, and finally a 0.2 mm thick polyethylene film (inner film) After coating and to produce a photocurable lining material was formed into a tubular shape. The weight ratio of the used glass fiber to the photocurable resin composition is 1: 1, and a plurality of light beams having different tube thicknesses are adjusted by adjusting the thickness of the photocured layer to the tube thickness t shown in the following table. A curable lining material was prepared.

2. Curing of photocurable lining material As shown in the table below, the inner diameter φ (mm) of the photocurable lining material in an expanded state, the tube thickness t (mm) of the photocurable lining material, the output P ( W), moving speed v (mm / s), etc. were changed in each case, and light irradiation was performed to cure the photocurable lining material.

In the example shown in Table 1, a lamp coupling body (output P: 3600 W, in the coupling direction of the lamp coupling body) in which six gallium lamps (output P _i : 600 W, peak wavelength: 420 nm) are connected in series as the light irradiation device. length: 2900 mm, the output P _a per lamp connecting body unit length: 1.24W / mm, adjacent lamps average interval: 483 mm) was used.

In the example shown in Table 2, a lamp assembly (output P: 9000 W, in the connecting direction of the lamp assembly) in which nine gallium lamps (output P _i : 1000 W, peak wavelength: 420 nm) are connected in series as the light irradiation device. Length: 3760 mm, output per lamp connected unit length P _A : 2.39 W / mm, average interval between adjacent lamps: 418 mm).

In the examples shown in Tables 3 and 4, a lamp assembly (output P: 12000 W, connection of lamp assembly) in which 12 gallium lamps (output P _i : 1000 W, peak wavelength: 420 nm) are connected in series as a light irradiation device. The length in the direction: 4960 mm, the output P _A per unit length of the lamp assembly: 2.42 W / mm, and the average interval between adjacent lamps: 413 mm) were used.

  Further, in the example shown in Table 5, when the photocurable lining material has an inner diameter φ of 250 mm and a tube thickness of 5 mm, a connected lamp body (connecting six gallium lamps having different outputs (peak wavelength: 420 nm) ( The length of the lamp connecting body in the connecting direction: 2500 mm and the average distance between adjacent lamps: 417 mm) were used.

  In addition, the tube thickness t in the following table is the thickness of the photocuring layer (see reference numeral 32 in FIG. 3) of the photocurable lining material, and the inner diameter φ is a state in which the diameter of the produced photocurable lining material is expanded. Means the inner diameter of As the gallium lamp, a product manufactured by Sun Energy (model number SEG1500C1d02) was used.

  The cured lining material was checked for visual deterioration and the presence or absence of poor curing. The results are shown in Tables 1-5. ○ indicates that neither deterioration nor poor curing was observed.

A graph is drawn with the tube thickness t (mm) of the photo-curing lining material on the horizontal axis and the radiant energy E _V (J / mm ³ ) per unit volume on the vertical axis, and the mathematical formula is calculated from the power approximation curve. did. The results are shown in Table 6. FIG. 4 shows, as an example, a graph in the case where a photocurable lining material having a tube diameter φ of 400 mm is cured using lamp assemblies (1000 W × 12).

<Evaluation results>
As shown in each table, when the radiation energy E _V per unit volume of the photocurable lining material is in the range of 0.05 to 0.25 J / mm ³ , the photocurable lining material is deteriorated. No or no occurrence was found, and no poor curing was observed.

Further, when the tube thickness t of the photocurable lining material and the radiant energy E _V satisfy the relationship of the above formula (I), it was confirmed that the lining material was not slightly deteriorated and could be cured more accurately. . Then, as shown in FIG. 4, in accordance with the tube thickness of the photocurable lining material is increased, radiant energy E _V per unit volume required for curing is reduced. In particular, when the tube is thin and has a gentle slope curves with decreasing degree of radiant energy E _V is large, the pipe thickness is increased. This means that a certain time is required from the start of light irradiation to the start of the photopolymerization reaction, and the time from the start of the polymerization reaction to the end is immediately terminated without much depending on the tube thickness. It shows that an optimum curing reaction is performed by irradiating a relatively large amount of radiant energy per unit volume when the tube thickness is thinner than when the tube thickness is thick. On the other hand, as shown in Table 5, when the radiation intensity R exceeded 0.0046, it was recognized that slight deterioration occurred in the inner surface layer of the lining material.

32 Photocuring layer 34 Outer film 36 Inner film 60 Lamp coupling body 62 Light irradiation lamp 64 Pulling wire 66 Leg 68 Wheel 100 Photocurable lining material 200 Sewage pipe

Claims (6)

Introducing a tubular photocurable lining material into an existing pipe, and introducing and arranging the introduced photocurable lining material to expand along the inner peripheral surface of the existing pipe; and inside the photocurable lining material An existing pipe repairing method including a light irradiation step of irradiating light to the photocurable lining material while moving a light irradiation device,
The existing pipe is a sewer pipe,
The photocurable lining material includes a photocurable resin composition containing an unsaturated polyester resin or vinyl ester resin, styrene and a photopolymerization initiator,
The content of the styrene is 25 to 40% by mass with respect to the mass of the entire photocurable resin composition,
The photocurable resin composition is contained in the photocurable lining material in a state where the fiber base material is impregnated, and a weight ratio of the fiber base material to the photocurable resin composition (fiber base material: light). Curable resin composition) is 45:55 to 55:45,
Content of the said photoinitiator is 0.5-5 mass% with respect to the mass of the said whole photocurable resin composition,
The light irradiation step is performed such that radiant energy generated from the light irradiation device is 0.05 to 0.25 J / mm ³ per unit volume of the photocurable lining material,
The radiant energy E _V (J / mm ³ ) per unit volume and the tube thickness t (mm) of the photocurable lining material are expressed by the following formula (I):

(However, A is 0.30 to 0.55, and B is -0.95 to -0.65.)
Satisfy the relationship
Existing pipe repair method which is characterized in that the light irradiation step in the range of the radiant energy E _V obtained according to the tube thickness of the photocurable lining material in accordance with the formula (I). The light irradiation device is a lamp assembly having a configuration in which a plurality of light irradiation lamps are connected in series,
Existing pipe repair method of claim 1 where the output P _A per unit length of the connecting direction of the lamp connecting member is characterized in that it is a 0.5 to 4 W / mm. 3. The existing pipe repairing method according to claim 1, wherein the light irradiation step is performed so that a radiation intensity by the light irradiation device is 0.0008 to 0.0046 W / mm ² . 2. The light irradiation step is performed such that radiant energy generated from the light irradiation device is 2.0 J / mm ² or less per unit area of an inner peripheral surface of the photocurable lining material. The existing pipe repair method of any one of -3.   The length of the connecting direction of the lamp connecting body is 2500 to 6000 mm, and the lamp connecting body is moved at a speed of 2.5 to 20 mm / s. 5. The existing pipe repair method according to any one of items 3 and 4.   6. The existing pipe repair according to claim 2, wherein an average interval between adjacent light irradiation lamps in the lamp assembly is 200 to 800 mm. 6. Method.

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