JPH02150334A - Device for repairing pipeline partially from inside - Google Patents

Abstract

PURPOSE:To enable the repairing operation using repairing material to be achieved quickly and surely by a method in which both ends of an expandable body are connected to the body of a repairing tool, and an air tight space is formed between the repairing tool body and the expandable body, and then the operating fluid-flowing path for pressure-feeding to and discharging from the air tight space is constructed on the side of the repairing body. CONSTITUTION:When it is recognized that a repairing device is inserted into the position of the pin hole generated, the fluid operating fluid pressure is fed in the air tight space 4' in an expandable body 4 through a pressurized fluid conduit 11 and a pouring hole 10, thereby expanding the expandable body 4. The repairing sleeve 16 fitted to the outside of the expandable body 4 is also expanded uniformly and lengthwise in diameter, and is soon brought in close contact with the position of generated pin hole 15 on the inner surface of pipe line 14. Electric voltage is applied to the electrodes of metallic tapes 8, 8' positioned at both ends of cylindrical cloth 7 through an electric wire 9 from an electric current-feeding device, and when the cylindrical cloth 7 generates heat, the adhesive 18 of the repairing sleeve 16 positioned outside of the cloth, is heated, and then the heating is continued to exceed the gelation time of the adhesive 18. After the finish of cooling, the pressurized fluid is discharged from the air tight space 4' in the expandable body 4 through the pressurized fluid conduit 11, thereby shrinking the diameter of the expandable body.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for partially repairing gas pipes, water pipes, or other pipes buried underground from the inside thereof. .

[Prior art] As a repair method when corrosion occurs in a part of a gas pipe, etc. or a cause of leakage occurs, there is a method of partially repairing a gas pipe by applying a repair material to the inner surface of the pipe (Japanese Unexamined Patent Publication No. 58 -17
278) is publicly known.

This known example is a repair method in which adhesive is injected onto the inner surface of a pipe that requires repair to form an adhesive layer, and a softened ring-shaped thermoplastic repair material is expanded in diameter and adhered thereto. It is.

The apparatus shown in FIG. 6 is used in the 12th repair method.

In FIG. 6, reference numeral 101 denotes a ring-shaped rubber plate C1, both ends of which are fixed to side plates 102 and 102'. In addition, an outlet of a hot air pipe 103 is attached to one side plate 102 so that hot air is blown out to the outer peripheral surface of the rubber plate 101, and a compressed air pipe 103 is attached to one side plate 102 so that compressed air can be injected into the inside of the rubber plate 101. The tip of 104 is connected.

The above-mentioned repair material 105 is attached to the outer circumferential surface of the rubber plate 101, and the repair material 105 is softened by the hot air blown from the hot air pipe i03, and the repair material 105 is softened by the compressed air injected from the compressed air pipe 104. 105 is expanded in diameter.

[Solution I) Problem to be Solved] However, this known example has the following problems because hot air is used to soften the repair material.

The heat source of the hot air is generated above ground and is guided through the pipe to the repair area, so the heat source and the repair area are far apart, and the temperature will drop by the time the hot air reaches the repair area. Put it away. Therefore, it takes time for the repair material to soften.

Furthermore, in the known example, when the repair material is expanded in diameter and brought into close contact with the inner surface of the pipe, hot air is not applied to the adhesive layer after that, so it is not possible to accelerate the curing of the adhesive by heating. Therefore, it is necessary to press the repair material into the pipe and leave it at °C for a long time until the adhesive hardens naturally.

Furthermore, when the diameter of the repair material is expanded to bring it into close contact with the inner surface of the pipe, the repair material is not exposed to hot air, so the repair material begins to harden, and the repair material cannot be sufficiently crimped onto the inner surface of the pipe. Therefore, after repair, there is a possibility that a gap may be formed between the inner surface of the pipe and the repair material. In addition, there is a problem that a temperature gradient is created in the hot air near the outlet of the hot air piping and on the opposite side, making it impossible to uniformly heat the hot air in the circumferential direction.

The present invention has been proposed in view of the above points, and it is an object of the present invention to propose a device that can perform repair work using repair materials quickly and reliably in a device for partially repairing a pipe from its inner surface. It is a purpose.

[Means for Solving the Problems] The present invention proposes an apparatus having the following configuration as a means for solving the above-mentioned problems.

An inflatable body made of an airtight material that generates heat when energized is sheathed on the surface of a hollow repair tool body that can be inserted into a pipe, and both ends of this expandable body are connected to the repair tool main body. An airtight space is formed between the repair tool main body and the expansion body, and an operating fluid flow path for pumping fluid into the airtight space and removing the fluid is formed on the repair main body side. Partial repair is performed from the inside of the pipe line. device to do.

In the above device, the expandable body that generates heat when energized is a cloth-like body woven from crimped yarn, and an airtight layer made of rubber or stretchable resin is formed on the inner surface of the cloth-like body. The body may be coated or impregnated with a paint that generates heat when energized.

An example of a paint that generates heat when energized is one in which 50 to 60 parts of graft-polymerized acetylene black is added to a urethane resin serving as a medium resin, kneaded, and then dissolved in methyl ethyl ketone.

This exothermic paint may be applied to the surface of the cloth-like body using a brush, or may be sprayed using a gun. However, if the heat is not uniform throughout, a problem of local excess or deficiency of heat may occur, so extreme care must be taken to ensure uniformity.

Next, as a means of impregnation, the cloth-like body may be directly immersed in the exothermic paint, or the cloth-like body may be woven or knitted using the soaked threads.

The cloth-like body must have elasticity, and as a means for this, crimped yarn may be used as described above,
Stretchability may be imparted to the cloth-like body by knitting yarns.

Next, as a means of generating heat for the expandable body, there are two possible methods: coating or impregnating a cloth-like material with a heat-generating paint as described above, and constructing a cloth-like material by weaving or knitting the threads themselves that generate heat when energized. .

As such a heating yarn, a carbon-based heating element inserted into the core of a stretchable resin yarn, or an organic fiber yarn containing conductive particles can be considered.

[Operation] The above device first attaches the repair sleeve to the outside of the expansion body of the repair tool body, then applies adhesive to the outer surface of the repair sleeve, and inserts the repair tool body (repair device) into the pipe using the insert. Insert up to the repaired part. Next, the operating fluid is pressurized into the airtight space to expand the diameter of the expansion body and the repair sleeve outside this, and bring the repair sleeve into close contact with the repaired area.

Next, electricity is applied to the expansion body from the power supply device to cause the expansion body to generate heat, and the adhesive is heated through the repair sleeve until it gels. Once this happens, turn off the power supply and allow the adhesive to harden. This solidification can wait for natural cooling, or
This may be done forcibly, for example, by injecting a refrigerant into the airtight space.

Once the repair sleeve is completely adhered to the repaired area, remove the operating fluid from the airtight space and frame the expansion body.
Pull the repair tool out of the pipe and finish the work.

[Examples and effects] Examples 1 to 5 of the apparatus according to the present invention will be described below.
This will be explained based on the diagram.

Reference numeral 1 designates the repair tool main body, and this main body l has a through hole 2 that passes from an inlet 2' to an outlet i' inside, and a wheel arm 3 that can be freely operated in the radial direction by a spring 3 in the front and rear. It consists of 41 digits excluding the number 3.

Reference numeral 4 denotes an inflatable body, and both ends 5, 5 of the inflatable body 4 are fixed on the outer periphery of the body part 1' of the main body 1, and an airtight space 4 is formed between it and the body part 1 of the main body 1. are doing.

The inflatable body 4 is composed of an inner airtight layer 6 made of stretchable resin or rubber, and a cylindrical woven fabric 7 made of crimped yarn.

At both ends of the cylindrical woven fabric 7, a metal tape 8.8 is wrapped around the outer periphery and fixed, and a power supply device is connected to the metal tape 8.8 via positive and negative electric wires 9, respectively. (not shown). By the way, the weft of the tubular woven fabric 7 is a covered yarn in which polyurethane crimped yarn is wrapped with polyethylene terephthalate LA crimped yarn, and the warp is polyethylene terephthalate crimped yarn. This cylindrical woven fabric 7 was impregnated with the following exothermic paint and dried.

The heat-generating paint is prepared by adding 50 to 60 parts of graft-polymerized acetylene black to a urethane resin serving as a medium resin, kneading the mixture, and then dissolving the mixture in methyl ethyl ketone.

Metal powder-based and carbon-based additives can be considered as conductive additives for heat-generating paints, but carbon-based additives are preferred from the viewpoint of processability, cost, and controllability, and among them, graft-polymerized acetylene black is optimal. This graft-polymerized acetylene black has excellent dispersibility in the medium, so it can be uniformly attached to the processed yarn, resulting in a uniform resistor, and there is no possibility of heating due to localized current flow. Therefore, there is no danger of combustion and is very safe.

The cylindrical woven fabric 7 may be a crimped yarn impregnated with the heat-generating paint and dried, and woven into a cylindrical shape. Organic fibers containing conductive particles may be used as the cylindrical woven fabric 7. It may also be crimped yarn woven into a tubular shape.

10 is an operation fluid pressure injection hole, and this fluid pressure injection hole lO
is between the body portion 1' of the main body 1 and the expansion body 4! A hole is opened in the formed airtight space 4, and this injection hole IO is connected to a compressor (not shown) via a fluid pressure conduit 11.

In the figure, 12 is an insert connected to one end of the main body 1 by a coupling 13.

Next, an example of repair performed using the apparatus of the above embodiment will be explained.

Assume that a pinhole 15 has occurred in a part of the conduit 14 as shown in FIG.

First, a thermoplastic repair sleeve 16 having a smaller diameter than the inner diameter of the pipe line 14 is attached to the outside of the expansion body 4 of the repair device.

Next, apply adhesive 18 to the outer surface of repair sleeve 16,
A little internal pressure is applied to the airtight space 4 within the inflatable body 4 to prevent the repair sleeve 16 from coming off from the inflatable body 4.

Next, a working hole is excavated, the pipe line 14 is exposed therein, and the repair device is inserted through the cut hole using the insert body 12. The repair device moves smoothly within the conduit 14 using wheels 3.

After confirming that the repair device has been inserted to the point where the tunnel hole 15 occurs, the insertion of the device is stopped. This situation is illustrated in FIG. The location of the repair location 15 has been searched in advance, and the repair device is inserted based on this data.

Thereafter, a hydraulic operating fluid is supplied to the airtight space 4' within the expansion body 4 through the fluid pressure conduit 11 and the injection hole 10, and the expansion body 4 is expanded. Here, since the tubular woven fabric 7 is made of crimped yarn, it can be expanded and contracted together with the airtight layer 6. For this reason,
The expandable body 4 uniformly expands in the longitudinal direction. And attach it to the outside of the expansion body 4! Repair sleeve 1 being pulled
6 also expands in diameter uniformly in the longitudinal direction, and eventually comes into close contact with the inner surface of the conduit 14 where the pinhole 15 is generated.

Next, a voltage is applied from the power supply device via the electric wire 9 to the electrodes of the metal tapes 8.8 located at both ends of the cylindrical woven fabric 7, thereby causing the cylindrical woven fabric 7 to generate heat. When the temperature of the cylindrical woven fabric 7 rises, the adhesive 18 of the repair sleeve 16 located outside of the woven fabric 7 is heated.

The adhesive 18 is heated by the heat generated by the cylindrical woven fabric 7.
Repeat until gelation time exceeds 8.

When the gelation time of the adhesive 18 is exceeded, the power supply to the tubular woven fabric 7 is stopped to stop the heat generation, and the adhesive 18 of the repair sleeve 16 is cooled by natural cooling or other forced cooling means.
Increase its hardness. This situation is illustrated in FIG.

After cooling is completed, fluid pressure is removed from the airtight space 4 within the expansion body 4 through the fluid pressure conduit 11, and the expansion body 4 is aligned.

Once the repair sleeve 16 is brought into close contact with the pinhole 15 on the inner surface of the conduit 14 and the expansion body 4 is aligned as described above,
The repair device is recovered from inside the pipe 14, and the repair work is completed.

A situation in which the pinhole 15 has been repaired using the repair sleeve 16 is shown in FIG.

In order to prevent the adhesive 18 applied to the repair sleeve 16 from dripping, it is preferable to wrap the outer periphery of the repair sleeve 16 with a woven fabric 17 and impregnate the woven fabric 17 with the adhesive 18.

In addition, as a repair sleeve, the applicant has previously applied for a patent application
! No. 07991 application, a vibrator-like low melting point crystalline shape memory resin coated with a sealing material on the outer peripheral surface, or a thermosetting glass fiber reinforced plastic that is gel-like at room temperature may be used. good.

In the case of shape memory resin, the repair work is carried out in the same manner as above, by inserting the repair device into the repaired area, supplying power with the power supply device,
After generating heat in the cylindrical woven fabric 7 and heating the shape memory resin to near its melting point to make it easily expandable in diameter,
A compressor supplies fluid pressure into the expansion body 4 to expand the expansion body 4 and bring it into close contact with the location where the pinhole 15 is generated.

[Effects of the present invention] In the device of the present invention, the expansion body itself is heated by electricity, so the repair sleeve can be directly heated.
Therefore, the repair sleeve can be softened efficiently, uniformly, and quickly, regardless of the distance between the repair location and the pipe cut port.

Moreover, since the expansion body can heat the repair sleeve while expanding its diameter, the degree of adhesion to the inner surface of the tube can be further increased. Therefore, the repair sleeve will not peel off after the adhesive hardens.

Next, since the main body of the insertion tool of the repair device is hollow, repair work can be performed using a live pipe.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a repair device according to the present invention, and Fig. 2 is a
-a' line sectional view, Figure 3 is a line sectional view of the repair device inserted to the repair point, and Figure 4 is the state of expanding the diameter of the repair sleeve by expanding the expansion body and bringing it into close contact with the inner surface of the pipe. FIG. 5 is a vertical cross-sectional view of the repaired area showing the completion status of the repair, and FIG. 6 is an explanatory diagram of a known example. Insert body Fluid pressure injection hole Expanding body Tubular woven fabric repair sleeve Patent applicant Tokyo Gas Co., Ltd. Figure

Claims (1)

[Claims] 1. An inflatable body made of an airtight material that generates heat when energized is sheathed on the surface of a hollow repair tool body that can be inserted into a pipe, and both ends of this inflatable body are The repair tool body is coupled to the repair tool main body to form an airtight space between the repair tool main body and the expansion body, and an operating fluid flow path for pumping fluid into the airtight space and removing the fluid is configured on the repair main body side. A device that partially repairs pipes from the inside. 2. The inflatable body is a cloth-like body woven from crimped yarn, and an airtight layer made of rubber or elastic resin is formed on the inner surface of the cloth-like body,
2. A device for partially repairing a pipe from its inner surface as claimed in claim 1, wherein said cloth-like body is coated with or impregnated with a paint that generates heat when energized. 3. The inflatable body is a knitted cloth-like body, an airtight layer made of rubber or elastic resin is formed on the inner surface of the cloth-like body, and a paint that generates heat when electricity is applied to the cloth-like body is coated or impregnated. 2. A device for partially repairing a pipe line from the inner surface thereof according to claim 1. 4. Claim 1, wherein the inflatable cloth-like body having an airtight layer made of rubber or elastic resin on its inner surface is woven or knitted using threads that generate heat when energized. A device for partially repairing the described pipe from the inside.