Branch pipe lining material and branch pipe lining method

Abstract

To fix a flange of a branch pipe lining material to an inner peripheral surface of a main pipe with a simple configuration in a short time.SOLUTION: A photocurable resin layer 5 is provided on a flange 2 of a branch pipe lining material 1. The flange is made of plastic that is transparent to light capable of curing the photocurable resin layer. A head collar 15 of a work robot on which the flange is mounted is provided with multiple LEDs 20 that emit light capable of curing the photocurable resin layer. The photocurable resin layer is cured by being irradiated from below by the LEDs, and the flange is tightly attached to a main pipe.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a branch pipe lining material used for lining a branch pipe branching off from a main pipe, and a branch pipe lining method using the same. [Background technology]

[0002] A method is known in which a branch pipe lining material is used to line a branch pipe that branches off from a main pipe. In this method, a flange formed on one end of the branch pipe lining material is brought into close contact with the periphery of the branch pipe opening of the main pipe, the branch pipe lining material is then inverted and inserted into the branch pipe, and the branch pipe lining material is pressed against the inner peripheral surface of the branch pipe while the hardening resin impregnated in the branch pipe lining material is hardened to line the branch pipe.

[0003] Patent Document 1 describes a branch pipe lining method in which an adhesive made of thermosetting resin or photocurable resin is applied to the surface of a flange made of thermosetting resin on the branch pipe opening side or to a groove formed on that surface, and the flange is bonded to the inner surface of the main pipe with this adhesive to integrate the branch pipe with the main pipe.

[0004] Patent document 2 describes a branch pipe lining method in which an adhesive is applied to the surface of a flange made of thermoplastic resin on the branch pipe opening side, and this adhesive is used to adhere the flange to the inner surface of the main pipe, integrating the branch pipe with the main pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-38393 A [Patent Document 2] JP 2011-156689 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the branch pipe lining method described in Patent Document 1, a branch pipe lining material is inserted inverted into a branch pipe, and steam is ejected while the material is pressed against the inner peripheral surface of the branch pipe, and the heat hardens the thermoplastic resin impregnated in the branch pipe lining material and hardens the thermosetting adhesive applied to the flange. For this reason, the branch pipe lining method of Patent Document 1 has a problem in that the amount of heat transferred to the thermosetting adhesive applied to the flange is small, and the thermosetting adhesive takes a long time to harden. Patent Document 1 describes that the resin applied to the flange may be a photocurable resin, but does not describe how the photocurable resin is hardened.

[0007] In the branch pipe lining method described in Patent Document 2, the flange is pressed against the inner peripheral surface of the main pipe via a ring-shaped flange pressing tool in the form of a float, and hot water is supplied into this flange pressing tool to harden the thermosetting adhesive applied to the flange. In this branch pipe lining method, because the flange is made of thermoplastic resin, there are problems in that the temperature of the hot water cannot be made very high, and an auxiliary tool such as a flange pressing tool is required to press the flange against the inner peripheral surface of the main pipe.

[0008] The present invention has been made to solve such problems, and its object is to provide a branch pipe lining material that has a simple configuration and is capable of fixing the flange of the branch pipe lining material to the inner surface of a main pipe in a short period of time and with high efficiency, and a branch pipe lining method using the same. [Means for solving the problem]

[0009] The present invention (claim 1) is a branch pipe lining material for lining the inner peripheral surface of a branch pipe that intersects with a main pipe, a flange that is attached to the periphery of the branch pipe opening of the main pipe and has a photocurable resin layer on the attached surface; a flexible tubular resin absorbent material having one end connected to the flange and inserted into the branch pipe; The flange is characterized in that it is made of a plastic that is transparent to light capable of hardening the photocurable resin layer so that the photocurable resin layer is hardened and fixed to the periphery of the branch pipe opening.

[0010] The present invention (claim 7) is a branch pipe lining method for lining a branch pipe branching from a main pipe using a branch pipe lining material having a flange formed on one end, preparing a branch pipe lining material having a photocurable resin layer on a flange surface; a step of moving the branch pipe lining material to the branch pipe opening of the main pipe and bringing the photocurable resin layer on the flange surface into close contact with the periphery of the branch pipe opening; a step of irradiating the flange with light including ultraviolet rays from below the flange to harden the photocurable resin layer on the flange surface; a step of inserting a branch pipe lining material into the branch pipe to line the inside of the branch pipe; Equipped with The flange is characterized in that it is made of a plastic that is transparent to light capable of hardening the photocurable resin layer so that the photocurable resin layer is hardened and fixed to the periphery of the branch pipe opening. Effect of the Invention

[0011] According to the present invention, the flange of the branch pipe lining material is made of plastic that can transmit light capable of hardening the hardenable resin layer, and the photohardenable resin layer can be irradiated from below the flange, which simplifies the irradiation method and allows the photohardenable resin to be hardened within the entire process of lining the branch pipe, thereby shortening the work process and work time. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a side view of the branch pipe lining material according to the present invention. [Figure 2a] FIG. 4 is a top view showing the flange of the branch pipe lining material. [Figure 2b] 2b is a cross-sectional view of the tsuba taken along line XX' in FIG. 2a. [Diagram 3] 1 is a top view showing a flange of a branch pipe lining material provided with a photocurable resin sheet. FIG. [Figure 4] 1 is a perspective view showing a head collar of a work robot equipped with a flange of a branch pipe lining material. FIG. [Diagram 5]FIG. 11 is a circuit diagram showing an example of connection of LEDs arranged in a head collar. [Figure 6] 10 is an explanatory diagram showing the state in which the lateral pipe lining material is positioned around the periphery of the lateral pipe opening. FIG. [Figure 7] 1 is an explanatory diagram showing a state in which a flange of a lateral pipe lining material is in close contact with the periphery of an opening of a lateral pipe. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. EXAMPLES

[0014] The branch pipe lining material 1 shown in Figure 1 has a soft, flexible tubular resin absorbent material 3 made of nonwoven fabric, one end of which is folded back outward and attached to the upper surface of a flange-shaped collar 2. The tubular resin absorbent material 3 is impregnated with uncured liquid curable resin, and its outer circumferential surface is coated with an airtight plastic film 3a.

[0015] The material of the nonwoven fabric constituting the tubular resin absorbent material 3 is selected from polyester, polypropylene, nylon, acrylic, vinylon, etc., and the hardening resin impregnated therein is a thermosetting resin such as unsaturated polyester resin, vinyl ester resin, epoxy resin, etc. A photosetting resin can also be used as the hardening resin. The material of the plastic film 3a is selected from polyurethane, polyethylene, polyethylene / nylon copolymer, vinyl chloride, etc.

[0016] The flange 2 to which one end of the tubular resin absorbent material 3 is joined forms a curved surface that is curved in an arc shape with a curvature approximately equal to the inner surface of the main pipe 30 (Figure 6) described below, and its outer diameter is set larger than the inner diameter of the branch pipe 31 (Figure 6) described below.

[0017] As will be described later, the branch pipe lining material 1 has its flange 2 pressed tightly against the periphery of the branch pipe opening of the main pipe, and the tubular resin absorbent material 3 is inverted and inserted into the branch pipe. A ring-shaped packing 4 is attached to the branch pipe end on the face of the flange 2 facing the branch pipe opening (the upper face in Fig. 1), that is, the side to which the tubular resin absorbent material 3 is attached, as shown in Figs. 2a and 2b. The packing 4 is a sealing member made of a self-adhesive rubber or sponge-based elastic body, and the outer diameter of its upper part is approximately the same as the inner diameter of the branch pipe opening of the main pipe.

[0018] A photocurable resin layer 5 is provided on the upper surface of the flange 2 excluding the packing 4. The photocurable resin layer 5 is a resin layer made of a resin in which a crosslinked structure is formed by a reaction between oligomers and monomers having polymerization ability such as vinyl groups, acryloyl groups, and epoxy groups, using radicals and cations generated by irradiation with light (ultraviolet rays) as initiator species. When a liquid photocurable resin is used, the photocurable resin layer 5 is formed by applying it to the upper surface of the flange 2 with a brush or the like.

[0019] If there is a risk that the applied liquid photocurable resin will flow out from the top surface of flange 2, a ring-shaped gasket (not shown) made of the same material as gasket 4 is provided on the outer peripheral surface of flange 2 to prevent the photocurable resin from flowing off flange 2.

[0020] 3, the photocurable resin layer 5 can be formed of a ring-shaped photocurable resin sheet 7 having an outer diameter d1 corresponding to the outer diameter of the flange 2 and an inner diameter d2 corresponding to the outer diameter of the packing 4. The photocurable resin sheet 7 is temporarily attached to the upper surface of the flange 2 with a double-sided adhesive tape (not shown) or the like, with slits 7a provided as necessary to prevent wrinkles.

[0021] The liquid photocurable resin is preferably applied at the branch pipe lining construction site, but the process of attaching the photocurable resin sheet 7 to the flange 2 can also be performed in a factory and then transported to the construction site.

[0022] The tsuba 2 is made of plastics such as thermosetting or thermoplastic resins that can transmit light rays that can harden photocurable resins, for example, light rays including ultraviolet rays with wavelengths of 250-450 nm. For example, when using a thermoplastic resin such as polyvinyl chloride (PVC), it is possible to produce a transparent or translucent tsuba that can transmit light rays including ultraviolet rays with wavelengths of 250-450 nm by omitting the addition of a colorant.

[0023] 4 shows head collar 15 attached to work robot 12, which will be described later. Head collar 15 has curved portion 15a curved with approximately the same curvature as the underside of the flange, opening 15b approximately the same size as the branch pipe opening, cylindrical portion 15c extending downward from opening 15b, and connecting portion 15d connected to a hydraulic cylinder of the work robot.

[0024] A ring groove 15e is formed on the outer edge of the opening 15b of the head collar 15, and a light source that emits light capable of curing the photocurable resin layer 5, such as an ultraviolet LED (hereinafter referred to as LED 20), is disposed in this ring groove 15e. In this embodiment, eight LEDs 20 are disposed at equal intervals in the ring groove 15e. The number or density of the LEDs 20 to be disposed is determined in consideration of the material or size of the flange 2, the output (irradiation intensity) of the LEDs, the required curing time, and the like.

[0025] 5, the LEDs 20 are connected in series via lead wires 21, and are led to a connector 22 and connected to an external power source, for example, a 3-5 V DC power source (not shown), via a power line 23. The light emitted from the LEDs 20 passes through the flange 2 and is irradiated onto the photocurable resin layer 5 provided on the upper surface thereof, thereby curing the photocurable resin layer 5.

[0026] 6 shows the process of lining a branch pipe using the above-mentioned branch pipe lining material 1. A small-diameter branch pipe 31 branches off from a main pipe 30 such as a sewer pipe, and a branch pipe opening 31a is formed at the intersection of the main pipe 30 and the branch pipe 31. A work robot 12, a pressure bag 13, the branch pipe lining material 1, etc. are pulled into the main pipe 30.

[0027] In this embodiment, the main pipe 30 is already lined with the main pipe lining material 30a, and the branch pipe lining is applied as a so-called after-lining, but the present invention can also be applied to a main pipe that has not yet been lined.

[0028] The branch pipe lining material 1 is stored in the pressure bag 13 with the flange 2 mounted on the curved portion 15a of the head collar 15 and the uninverted portion of the tubular resin absorbent material 3 passing through the opening 15b and cylindrical portion 15c of the head collar 15.

[0029] The head collar 15 is connected to the hydraulic cylinder 14 of the work robot 12 via a connecting portion 15d. The hydraulic cylinder 14 rotates in the direction of the arrow a around the axis of the main pipe 30 and moves up and down in the directions of the arrows b and c, and the head collar 15 and the flange 2 of the branch pipe lining material 1 attached thereto also move accordingly.

[0030] Each LED 20 arranged on the head collar 15 is powered from a power source (not shown) within the work robot 12 via a power line 23 indicated by a dashed line. A TV camera 16 for monitoring is installed on the top of the work robot 12. Towing ropes 17, 18 are attached to the front and rear of the work robot 12, allowing the work robot 12, branch pipe lining material 1, etc. to be moved within the main pipe 30.

[0031] A steam hose 11 is attached to the end of the tubular resin absorbent material 3 via a connector 10, and steam is supplied to the pressure bag 13 via the steam hose 11. Compressed air is also supplied to the pressure bag 13 via a pipe 25.

[0032] When the main pipe 30 is lined with a main pipe lining material 30a, the portion of the main pipe lining material 30a blocking the branch pipe opening 31a of the main pipe 30 is perforated to leave the branch pipe opening 31a open.

[0033] The work robot 12 is operated while monitoring the inside of the main pipe 30 with the TV camera 16, and is positioned so that the flange 2 of the branch pipe lining material 1 faces the periphery of the drilled branch pipe opening 31a of the main pipe 30, as shown in Figure 6.

[0034] In this state, as shown in Fig. 7, the hydraulic cylinder 14 is operated to move the head collar 15 upward, and the photocurable resin layer 5 is brought into close contact with the main pipe lining material 30a around the branch pipe opening. Then, the LED 20 arranged on the head collar 15 is turned on.

[0035] The light emitted from the LED 20 passes through the flange 2 and irradiates the photocurable resin layer 5, thereby curing the photocurable resin layer 5. The surface of the main pipe lining material 30a of the main pipe 30 is made of a plastic that is adhesive to the photocurable resin, such as PE film or unsaturated polyester resin, so the photocurable resin layer 5 is adhesive to both the flange 2 and the main pipe lining material 30a, and the flange 2 is firmly fixed to the main pipe 30 as the photocurable resin layer 5 hardens.

[0036] When a compressor (not shown) is driven to supply compressed air into the pressure bag 13 through the pipe 25, the tubular resin absorbent 3 is inverted and inserted into the branch pipe 31. After the tubular resin absorbent 3 has been inserted over a predetermined length, steam is ejected from the steam hose 11 to heat and harden the thermosetting resin impregnated in the tubular resin absorbent 3, lining the branch pipe over a predetermined length.

[0037] In the above branch pipe lining method, the photocurable resin layer 5 formed on the flange 2 of the branch pipe lining material 1 firmly fixes the flange 2 to the inner surface of the main pipe 3, making it possible to integrate the flange 2 with the main pipe 30, improving the watertightness between the main pipe 30 and the branch pipe 31, and preventing the flange 2 from coming off the main pipe 30 due to external forces. In addition, because the photocurable resin layer 5 can be irradiated from below the flange 2, the photocurable resin can be cured during the entire branch pipe lining process, shortening the work process and time.

[0038] In the above-described embodiment, multiple LEDs 20 are provided in one ring groove 15e in the circumferential direction of the flange, but in addition, multiple ring grooves may be provided concentrically, and multiple LEDs 20 may be provided in the circumferential direction in another concentric ring groove, and each LED may be illuminated. [Explanation of symbols]

[0039] 1 Branch pipe lining material 2 Tsuba 3. Tubular resin absorbent 4. Packing 5 Photocurable resin layer 7 Photocurable resin sheet 12 Working robots 13 Pressure Bag 14 Hydraulic cylinder 15 Head Color 15a Curved section 15b opening 15c Cylinder section 15d Connecting part 15e Ring groove 20 LED 21 Lead Wire 22 Connectors 23 Power line 30 Mains 30a Main pipe lining material 31 Branch pipe 31a Branch pipe opening

Claims

1. A branch pipe lining material for lining the inner peripheral surface of a branch pipe that intersects with a main pipe, a flange that is in close contact with the periphery of the branch pipe opening of the main pipe and has a photocurable resin layer on the contact surface; a flexible tubular resin absorbent material having one end connected to the flange and inserted into the branch pipe; A branch pipe lining material characterized in that the flange is made of a plastic that can transmit light rays that can harden the photocurable resin layer so that the photocurable resin layer hardens and is fixed to the periphery of the branch pipe opening.

2. 2. The lateral pipe lining material according to claim 1, wherein the photocurable resin layer is formed by applying a liquid photocurable resin to the flange or by attaching a photocurable resin sheet to the flange.

3. The branch pipe lining material described in claim 1, characterized in that its flange is mounted on a work robot that travels inside the main pipe and moved to the periphery of the branch pipe opening, and a light source that emits light capable of curing the photocurable resin layer is placed on the flange mounting surface of the work robot.

4. 4. The lateral pipe lining material according to claim 3, wherein a plurality of the light sources are provided on a flange mounting surface of the work robot so as to be arranged at equal intervals in the circumferential direction of the flange.

5. 4. The lateral pipe lining material according to claim 3, wherein the light source is an LED that emits light including ultraviolet light.

6. A branch pipe lining method for lining a branch pipe branching from a main pipe using a branch pipe lining material having a flange formed at one end, preparing a branch pipe lining material having a photocurable resin layer provided on a flange surface; a step of moving the branch pipe lining material to the branch pipe opening of the main pipe and bringing the photocurable resin layer on the flange surface into close contact with the periphery of the branch pipe opening; a step of irradiating the flange with light including ultraviolet rays from below the flange to harden the photocurable resin layer on the flange surface; and a step of inserting the branch pipe lining material into the branch pipe to line the inside of the branch pipe, A branch pipe lining method characterized in that the flange is made of a plastic that can transmit light rays that can harden the photocurable resin layer so that the photocurable resin layer hardens and adheres to the periphery of the branch pipe opening.

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