JP2008142996A - Piping lining method and photocuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably cure a resin layer formed of a photocurable resin on an inner wall of a pipe at a low temperature.
A resin layer of a photocurable resin is deposited on the inner wall of a pipe, and the resin layer is cured by light irradiation using a light irradiation device using an LED whose main irradiation wavelength is ultraviolet light.
[Selection] Figure 2

Description

  The present invention relates to a method of forming a resin layer with a photocurable resin on an inner wall of a pipe, curing the photocurable resin by irradiating the resin layer with light, and a photocuring apparatus used therefor.

  A drainage pipe of a concrete structure building or condominium has a vertical drainage pipe and a branch pipe connected to it from each room, and these are composed of an iron pipe, a vinyl chloride pipe or the like. As the drain pipe is used for many years, its inner wall gradually deteriorates, causing cracks and the like, and water leakage may occur from there.

  Therefore, when the deterioration of these pipes has progressed to some extent, the inner walls of the pipes are renovated (repaired), and the inner walls of the pipes are evenly lined with a correction material such as a resin material to correct the corrosion. Many methods for forming an excellent lining layer are employed. There are various methods for lining a conventional pipe. A resin layer is formed on the inner wall of the pipe with a photo-curing resin, and the resin layer is irradiated with light to cure the photo-curing resin. And a method for forming a hard lining layer is known.

  In the conventional lining method by light irradiation, a resin layer is formed with a photocurable resin that is cured by light irradiation on the inner wall of the pipe to be lined, and then the resin layer is irradiated with light from the inside of the pipe and cured. In order to irradiate the resin layer with light, a photocuring apparatus provided with a number of ultraviolet lamps (UV lamps) is used.

  In a conventional photocuring apparatus using an ultraviolet lamp, a number of ultraviolet lamps are connected in series, and the connected body is moved along a pipe. However, since the ultraviolet lamp has a large size, the photocuring apparatus becomes large, and the ultraviolet lamp has a problem that the temperature becomes high at about 500 ° C to 700 ° C.

  When the high-temperature ultraviolet lamp comes into contact with the photocurable resin, the photocurable resin may ignite. Therefore, it is necessary to cover the ultraviolet lamp with transparent quartz glass to prevent contact with the photocurable resin. Moreover, in order to prevent the inside of piping from becoming high temperature, it is necessary to always cool by supplying cold air from the outside. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems in the pipe lining method by the photocuring method, and an object of the present invention is to provide a new pipe lining method and a photocuring apparatus used therefor.

  The pipe lining method according to the present invention for solving the above-described problems is a method of forming a resin layer with a photocurable resin on the inner wall of the pipe and curing the photocurable resin by irradiating the resin layer with light. It is. Then, the resin layer is irradiated with light by a photocuring apparatus using an LED whose main irradiation wavelength is ultraviolet light (claim 1).

  In the piping lining method, the photocurable resin may contain a photopolymerization initiator that initiates polymerization of the resin by ultraviolet rays and visible rays.

  In any one of the above piping lining methods, a photocurable resin is interposed between an inner film and an outer film constituting an elongated double cylindrical body, and a front resin-free portion is provided before and after the photocurable resin. The lining material formed with the rear resin-free portion is arranged along the inside of the pipe, and the resin layer is formed by pressing the inner film inside with pressurized air to closely adhere the double cylinder to the inner wall of the pipe, After the photocurable resin is cured, the inner film can be pulled out from the pipe.

  The photocuring apparatus according to the present invention for solving the above problems is a photocuring for forming a resin layer with a photocurable resin on an inner wall of a pipe and curing the photocurable resin by irradiating the resin layer with light. Device. Each main body includes a plurality of elongated cylindrical main bodies, a plurality of LEDs whose main irradiation wavelength is ultraviolet light provided on the surface of each main body, and a connection portion and a wheel portion provided at an end portion in the axial direction of each main body. Are connected to each other by their connecting portions so as to be bendable (claim 4).

  In the photocuring apparatus, a plurality of LEDs provided in each main body are connected to power supply wirings, the power supply wirings of each main body are connected to each other through adjacent connecting portions, and the power supply wiring is extended from the last main body to the outside. (Claim 5).

  In any one of the above photocuring apparatuses, the imaging apparatus can be connected to the front part of the main body at the foremost part, and the wiring of the imaging apparatus can be extended to the outside from the last main body through each connecting part and each main body ( Claim 6).

  In the photocuring device, the imaging device is provided with a first temperature detection unit for detecting the temperature of the resin layer and a second temperature detection unit for detecting the internal temperature of the pipe, and the wirings of the temperature detection units are connected to each other. It is possible to extend from the rearmost body through the section and each body to the outside (Claim 7).

  In the piping lining method of the present invention, as described in claim 1, a resin layer is formed of a photocurable resin on the inner wall of the pipe, and the photocurable resin is cured by irradiating the resin layer with light. In the lining method, the fat layer is irradiated with light by a photocuring apparatus using an LED whose main irradiation wavelength is ultraviolet light. Since the heat generation temperature of the LED is usually 80 ° C. or lower, there is no fear that the resin layer will ignite at a high temperature, and it is not necessary to provide a special contact prevention means for the resin layer in the photocuring apparatus. Further, it is not necessary to always supply cold air from outside into the pipe. Further, since the LED light source can be formed in a small size, the size of the photocuring apparatus, particularly in the direction perpendicular to the axial direction thereof, can be reduced, and therefore it can be easily applied to the lining of a small diameter branch pipe.

  In the piping lining method, as described in claim 2, the photocurable resin can contain a photopolymerization initiator that initiates polymerization of the resin by ultraviolet rays and visible rays. Usually, an LED light source whose main irradiation wavelength is in the ultraviolet region of 380 to 410 nm includes visible light having an irradiation wavelength of 750 nm or more to some extent. Therefore, as described above, a resin is obtained by using ultraviolet rays and visible light as a photopolymerization initiator. If a material that can accelerate polymerization is used, the polymerization promoting action by visible light can be used in addition to ultraviolet rays, so that the polymerization (curing) time of the resin can be shortened.

  In any one of the above piping lining methods, as described in claim 3, a photocurable resin is interposed between an inner film and an outer film constituting an elongated double cylindrical body, and the photocurable resin is provided. A lining material formed with a front resin-free portion and a rear resin-free portion before and after the is placed along the inside of the pipe, and the inner side of the inner film is pressed with pressurized air to closely adhere the double cylinder to the inner wall of the pipe By forming a resin layer, the inner film can be pulled out from the pipe after the photocurable resin is cured.

  When such a lining material is used, a resin layer can be formed by easily arranging a photocurable resin in a narrow pipe. And by lining the inner wall of the branch pipe branched from the main pipe, for example, by forming the front resin-less part in the front part of the photocurable resin layer, when the lining material is inserted into the branch pipe from the ground side, Since the front resin-free portion can protrude from the main pipe side opening of the branch pipe to the main pipe, it is possible to line up to the opening of the branch pipe. Also, by forming a rear resin-free part at the rear of the photo-curable resin layer, the rear resin-free part can be placed in the introduction part to the branch pipe, so a photo-curable resin is used for the introduction part that does not require lining. This eliminates the need to reduce the amount of photocurable resin used.

  The photocuring device of the present invention is a photocuring device for curing the photocurable resin as described in claim 4, wherein the photocuring device is a main body provided on a plurality of elongated cylindrical main bodies and the surfaces of the main bodies. A plurality of LED light sources having an irradiation wavelength of ultraviolet light, and a connecting portion and a wheel portion provided at an end portion in the axial direction of each main body, each main body being connected to each other so as to be bendable by the connecting portion. Yes.

  According to this device, since the heat generation temperature of the LED is low and the resin layer does not cause a fire accident, it is not necessary to provide a special contact prevention means for the resin layer. Moreover, it is not necessary to always supply cold air from the outside into the piping. Furthermore, since the apparatus can be miniaturized, it can be easily applied to the lining of small-diameter branch pipes.

  In the photocuring device, as described in claim 5, the plurality of LEDs provided in each of the main bodies are connected to power supply wirings, and the power supply wirings of the main bodies are connected to each other through adjacent connecting portions. Can extend from the tail body to the outside. According to this apparatus, since the power supply wiring of all the LEDs is housed inside the main body and can be extended from the last main body to the outside, the photocuring apparatus can be easily moved in the pipe.

  In any one of the above photocuring devices, as described in claim 6, the imaging device is connected to the front portion of the main body at the foremost portion, and the wiring of the imaging device is connected to each of the connecting portions and the main body at the rearmost body. Can be extended to the outside. When such an image pickup apparatus is provided, photocuring can be performed after confirming the formation state of the resin layer to be irradiated with light, so that the lining re-operation and the like are greatly reduced.

  In the photocuring device, as described in claim 7, the imaging device is provided with a first temperature detection unit that detects the temperature of the resin layer and a second temperature detection unit that detects the internal temperature of the pipe, The wiring of the temperature detection unit can be extended from the last main body to the outside through each connecting portion and each main body. By providing such a temperature detection unit, it is possible to perform lining while monitoring the temperature of the resin layer and the pipe that affect the photocuring.

  Next, the best embodiment of the present invention will be described based on the drawings. FIG. 1 is an overall view of a piping lining method of the present invention and a photocuring apparatus used therefor, and FIG. 2 is a perspective view of a main body portion which is a main part of FIG. In these figures, the photocuring apparatus 1 includes a plurality of elongated cylindrical main bodies 2, a plurality of LEDs 3 whose main irradiation wavelength is provided on the surface of each main body 2, and an axial end of each main body 2. A connecting portion 4 provided and a wheel portion 5 provided on the connecting portion 4 are provided, and the main bodies 2 are connected to each other by the connecting portions 4 so as to be bent.

  The main body 2 is formed in a cylindrical shape with, for example, metal or hard resin, and its front and rear ends are closed with the same material. A plurality of LEDs 3 are arranged on the outer peripheral surface of the main body 2 so as to be uniformly distributed, and the irradiation direction of each LED 3 is on a line from the axis of the main body 2 toward the radial direction. As the LED 3 to be used, a commercially available general ultraviolet LED can be used, and the irradiation wavelength of the ultraviolet LED is mainly in the ultraviolet region of 380 to 410 nm, but visible light having an irradiation wavelength of 750 nm or more is also included in a considerable proportion. ing.

  The wiring of the LED 3 provided in each main body 2 extends outside from the last main body 2 through each connecting portion 4 and each main body 2, and is then accommodated in a cable 10 for traction and connected to the control portion 11. A display unit 13 such as a display is connected to the control device 11 via a cable 12. The control device 11 can be constituted by a computer device such as a personal computer.

  The connecting shaft 6 extends in the axial direction from the front and rear of the main body 2 so as to connect the adjacent main bodies 2 to each other. For example, a flexible pipe or a universal joint can be used as the connecting portion 4. When the universal joint is used, the axes of the connecting shafts 6 connected to the left and right of the universal joint can be bent to each other, whereby the adjacent main bodies 2 are connected to each other so as to be freely bent. The wheel portion 5 is provided on the outer peripheral surface of the connecting portion 4. Although the illustrated wheel portion 5 has two sets of wheels 5 extending in opposite directions from the outer peripheral surface, three or more sets of the wheels 5 can be provided at equal intervals in the circumferential direction.

  As shown in FIG. 1, in this embodiment, an imaging device 7 such as a small TV camera device is connected to the front connecting portion 4 of the main body 2 at the foremost part, and the imaging device 7 detects the temperature of the resin layer. 1 temperature detector 8 and a second temperature detector 9 for detecting the internal temperature of the pipe are provided. The wiring of the imaging device 7, the first temperature detection unit 8, and the second temperature detection unit 9 is extended from the rearmost body 2 to the outside through the connecting portions 4 and the main bodies 2, and then pushed into the cable 10 for pushing. It is stored and connected to the control unit 11. The connecting part 4 on the front side of the main body 2 at the foremost part is not a universal joint but has the same structure as a normal pipe joint. The imaging device 7 is provided with an illumination unit using a plurality of LEDs to illuminate the surroundings, and the wiring method is the same as the wiring of the imaging device 7.

  FIG. 3 is a partial cross-sectional view showing an example of a lining material for forming a resin layer. The lining material 20 is configured by interposing a photocurable resin 24 in a cylindrical shape between an inner film 22 and an outer film 23 constituting an elongated double cylinder 21. A front resin-free portion 25 is formed on the front side of the photocurable resin 24, and a rear resin-free portion 26 is formed on the rear side.

  The illustrated lining material 20 has an inner film 22 on the outer side and an outer film 23 on the inner side. As will be described later, this type of lining material 20 has an inner film 22 and an outer film 23 that are inserted into a pipe. The lining material 20 is used for the inversion method. When the non-inversion method is employed, the lining material 20 is used in which the inner film 22 is on the inner side and the outer film 23 is on the outer side.

  For the inner film 22 and the outer film 23, a flexible transparent sheet-shaped cylinder, for example, a sheet-shaped cylinder formed by blow molding of a flexible resin such as polyethylene, polystyrene, or polyamide is used. it can. In the illustrated example, an outer film 23 coated with a photocurable resin 24 on a part of its surface is inserted partway through the inner film 22 to form a front resin-free portion 25 in the front inner film 22 portion. Further, the rear resin-free portion 26 is formed by applying the photocurable resin 24 only to a part of the outer film 23 (for example, the length L shown in the drawing).

  The front end portion of the inner film 22 is closed with a packer 27, and a strip 28 such as a rope is fastened to the packer 27. As will be described later, the strip material 28 is used when the lining material 20 is reversed or when the inner film 22 is pulled out from the pipe after the curing of the photocurable resin 24 is completed.

  As the photocurable resin 24, for example, an epoxy acrylate resin or a vinyl ester resin to which a photopolymerization initiator is added can be used. As the photopolymerization initiator, an ultraviolet polymerization initiator that accelerates the polymerization of the resin by ultraviolet rays can be used. However, as described above, a photopolymerization initiator that can accelerate the polymerization of the resin by the action of both ultraviolet rays and visible light should be used. Is desirable. Photopolymerization initiators are well known in this field, and many types are commercially available from various manufacturers. From among them, a polymerization initiator that can accelerate the polymerization of the resin by the action of both ultraviolet rays and visible light is selected, or A photopolymerization initiator for ultraviolet light and a photopolymerization initiator for visible light may be selected and mixed at a predetermined ratio.

  FIG. 4 is a schematic view showing a state in which the lining material 20 shown in FIG. 3 is inserted into the pipe. In the illustrated example, a case where a plurality of branch pipes 33 are connected to a vertical drain pipe 32 in a building and a lining construction is performed on the inner wall of the vertical drain pipe 32 will be described.

  A repair machine 34 is prepared for inserting the lining material 20 into the vertical drain pipe 32. The repair machine 34 includes a winding unit 35, a cylindrical equipment elbow 36 connected to the winding unit 35, a compressor 37 that sends pressurized air to the equipment elbow 36 via the winding unit 35, and a part of the equipment elbow 36. A cylindrical branch portion 38 that branches off from the center is provided. Further, a flexible pipe 39 is connected to send pressurized air from the compressor 37 to the winding unit 35. A drum 40 is rotatably provided on the winding unit 35, and a handle 41 is connected to the rotation shaft thereof, and the drum 40 can be rotated by rotating the handle 41.

  The lining material 20 in which the inner film 22 shown in FIG. 3 is disposed on the outside is wound around the drum 40 with the inner film 22 reversed to the outside by the repair machine 34. Therefore, first, the strip 28 attached to the tip of the lining material 20 is inserted from the opening of the equipment elbow 36 and tied to the drum 40 of the take-up portion 35, and the handle 41 is rotated to remove the lining material 20 from the tip of the drum. Wind up to 40. When the winding is completed, the rear end portion of the anter film is folded back and covered with the opening portion of the equipment elbow 36, and the covered portion is fixed with the fastening band 42 from the periphery, and the state shown in FIG. 4 is obtained.

  Next, after the opening of the branching portion 38 is covered, the compressor 37 is operated and pressurized air is supplied to the winding portion 35, and the leading end of the inner film 22 stretches the strip material 28 to the equipment elbow 36. Pushed back, the tip of the lining material 20 is pulled out from the opening of the equipment elbow 36. At this time, the lining material 20 is reversed, the outer film is located outside, the inner film is located inside, and they are inserted into the vertical drainage pipe 32.

  That is, the lining material 20 moves in the vertical drain pipe 32 by the pressurized air and reaches the opening to the main pipe 30.

  FIG. 5 is a view showing a state in which the lining material 20 is inserted into the vertical drain pipe 32. The inner film 22 is swelled by pressurized air supplied to the inner film 22 and pressed against the outer film 23, and the photocurable resin 24 provided on the outer film 23 is pressed against the inner wall of the vertical drain pipe 32 to form the resin layer. To do. FIG. 6 is a cross-sectional view showing a state in which a resin layer 24 a made of a photocurable resin 24 is formed on the inner wall of the vertical drain pipe 32.

  Next, as shown in FIG. 5, the lid of the branch pipe 38 is opened, and the photocuring apparatus 1 shown in FIG. 1 is carried into the equipment elbow 36, and the tip portion of the inner film 22 is passed through the interior of the lining material 20. Push it to the tip. In that case, the formation state of the resin layer 24a is confirmed by the imaging device 7 provided in the front part of the main body 2 in the foremost part.

  Next, a plurality of LEDs 3 provided on each main body 2 of the photocuring apparatus 1 are turned on, light having a main irradiation wavelength of ultraviolet rays is irradiated onto the resin layer 24a, and the pulling cable 10 is gradually pushed into the resin. The resin layer 24a is cured by light irradiation at a low speed from the rear end portion to the front end portion of the layer 24a. At that time, the temperature of the resin layer 24a is detected by the first temperature detection unit 8 provided in the imaging device 7, and the internal temperature of the vertical drain pipe 32 is detected by the second temperature detection unit 9. Monitor the layer 24a for adverse effects. Note that the image by the imaging device 7 and the detected temperatures of the first temperature detection unit 8 and the second temperature detection unit 9 are displayed on the display unit 13 shown in FIG.

  Next, after the photocuring apparatus 1 is pulled out from the branch pipe 38, the handle 41 is rotated to rewind the strip material 28 tied to the drum 40 to the take-up portion 35, so that the inner film 22 becomes the vertical drain pipe 32. The lining operation of the vertical drain pipe 32 is completed. The connecting portion with the branch pipe 33 is then opened, and the inner wall of the branch pipe 33 can be lined in the same manner as described above.

  The piping lining method and photocuring apparatus of the present invention can be used for lining the inside of piping such as various drainage pipes.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the piping lining method of this invention, and the whole figure of the photocuring apparatus used for it. The perspective view (A) of the main-body part which is the principal part of FIG. 1, and the perspective view of the connection part. The fragmentary sectional view which shows an example of the lining material for forming a resin layer. The figure which shows the state which inserts the lining material 20 shown in FIG. 3 in piping. The figure which shows the state which inserted the lining material 20 in the vertical drain pipe 32. FIG. FIG. 3 is a cross-sectional view showing a state in which a resin layer 24a made of a photocurable resin 24 is formed on the inner wall of a vertical drain pipe 32.

Explanation of symbols

1 Photocuring device 2 Body 3 LED
DESCRIPTION OF SYMBOLS 4 Connection part 5 Wheel part 6 Connection shaft 7 Imaging device 8 Temperature detection part 9 Temperature detection part 10 Cable 11 Control apparatus 12 Cable 13 Display part 20 Lining material

DESCRIPTION OF SYMBOLS 21 Double cylinder 22 Inner film 23 Outer film 24 Photocurable resin 24a Resin layer 25 Front resin no part 26 Rear resin no part 27 Packer 28 Strip material

30 Main pipe 32 Vertical drain pipe 33 Branch pipe 34 Repair machine 35 Winding part 36 Equipment elbow 37 Compressor 38 Branching part 39 Piping 40 Drum 41 Handle

Claims (7)

In the method of forming the resin layer 24a with the photocurable resin 24 on the inner wall of the pipe and curing the photocurable resin 24 by irradiating the resin layer 24a with light,
A piping lining method, wherein the resin layer 24a is irradiated with light by a photocuring apparatus 1 using an LED 3 whose main irradiation wavelength is ultraviolet light. In claim 1,
The pipe lining method, wherein the photocurable resin 24 contains a photopolymerization initiator that initiates polymerization of the resin by ultraviolet rays and visible rays. In claim 1 or claim 2,
A photocurable resin 24 is interposed between the inner film 22 and the outer film 23 constituting the elongated double cylindrical body 21, and the front resin-free portion 25 and the rear resin-free portion are provided before and after the photocurable resin 24. The resin layer 24a is formed by arranging the lining material 20 formed with 26 along the inside of the pipe and pressing the inside of the inner film 22 with pressurized air to bring the double cylinder 21 into close contact with the inner wall of the pipe. A piping lining method, wherein the inner film 22 is pulled out from the piping after the photocurable resin 24 is cured. In the photocuring apparatus 1 for forming the resin layer 24a with the photocurable resin 24 on the inner wall of the pipe and curing the photocurable resin 24 by irradiating the resin layer 24a with light,
A plurality of elongated cylindrical main bodies 2, a plurality of LEDs 3 whose main irradiation wavelength is ultraviolet light provided on the surface of each main body 2, and a connecting portion 4 and a wheel portion 5 provided at the axial end of each main body 2 The photocuring device is characterized in that the main bodies 2 are connected to each other by their connecting portions 4 so as to be bendable. In claim 4,
The plurality of LEDs 3 provided in each of the main bodies 2 are connected to power supply wirings, and the power supply wirings of the main bodies 2 are connected to each other through adjacent connecting portions 4, and the power supply wirings extend from the last main body 2 to the outside. A photocuring apparatus characterized by the above. In claim 4 or claim 5,
An image pickup device 7 is connected to the front portion of the main body 2 at the foremost portion, and the wiring of the image pickup device 7 extends from the rearmost main body 2 to the outside through the connection portions 4 and the main bodies 2. Curing equipment. In claim 6,
The photographing device 7 is provided with a first temperature detection unit 8 for detecting the temperature of the resin layer 24a and a second temperature detection unit 9 for detecting the internal temperature of the pipe. A photocuring apparatus, wherein wiring extends from the rearmost main body 2 to the outside through each connecting portion 4 and each main body 2.

Images