JP2002333091A - Gas blow preventing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shut off the blow and leakage of a large amount of gas from a damaged part 14 of a polyethylene pipe 12 used for transporting a gas with simple work in a short time. SOLUTION: An expandable synthetic resin 16 is injected from a nozzle 19 of a feeder 15 to a comparatively large part 14 damaged by an excavator 13 such as a excavator with hoe equipment, of the polyethylene pipe 12. The expandable synthetic resin is expanded in the pipe 12 to block up the pipe 12 and to close the damaged part 14. When the damaged part 14 is located at a position buried by soil 11, an insertion hole for inserting the expandable synthetic resin can be easily formed in a short time by pressing a rod-shaped piercing tool 27 such as a soldering iron heated by more than a melting point of the pipe, to a position exposed from the soil, of the pipe, whereby the workability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas ejection preventing method for preventing a large amount of gas from being ejected when a pipe for transporting the gas is broken.

[0002]

2. Description of the Related Art Conventionally, when a pipe for transporting a flammable gas, for example, a city gas, is damaged, the damaged portion is first excavated and exposed from the soil, and the site worker is equipped with a respirator such as an oxygen cylinder. While taking into account oxygen deficiency, they approach the damaged area and apply a rag or clay to the damaged area to provide temporary treatment to suppress gas emission. Alternatively, even when the main pipe of a medium- or low-pressure cast iron pipe breaks due to medium-pressure corrosion leakage or extinguishing, the explosion-proof tool is used to excavate the main pipe, and after the broken portion is dug up, emergency treatment is given with clay or tape winding. Until then, the gas continues to erupt, and there is a problem in terms of safety of workers due to lack of oxygen and safety due to ignition of gas. When the gas ejection flow rate is large, it is necessary for an on-site worker to perform such an extremely dangerous and skillful operation.

[0003] After the Great Hanshin-Awaji Earthquake of 1995,
Flexible (non-corrosive PE) tubes that are flexible and do not corrode have been widely used. Since PE pipe is soft and its yield stress is less than one-tenth that of iron, if the PE pipe is damaged by construction using an excavator such as a backhoe, the damaged part of the PE pipe is large and a large amount of gas is ejected. Might be. P
With the widespread use of E-tubes, it is feared that the frequency of accidents in which large amounts of gas are ejected due to breakage of PE-tubes will increase in the future. Therefore, there is a demand for a method of urgently shutting off a large amount of gas from a damaged part.

FIG. 26 is a simplified cross-sectional view for explaining the prior art. A main pipe 2 is buried in the road 1, and is supplied from the pipe 2 through a supply pipe 3 from an inner pipe 5 in a site 4 of each house to a meter stand 6, and a meter union 7 is provided.
From the gas meter 8 to the gas consuming equipment in the house 9,
City gas is supplied. In an emergency where the pipe 2 is, for example, a PE pipe and a large amount of gas is squirted and leaked due to its breakage, a pair of gas meters 8 respectively located on both sides in the pipe axis direction of the broken part of the PE pipe 2 where the gas is squirted and leaked. Remove the meter union 7 at
A grease-like viscous liquid is inserted and supplied through the supply pipe 3.
The gas is allowed to reach the main pipe 2 to shut off the gas transport passage. In this prior art, since the amount of the grease-like liquid to be inserted is large, it takes time to shut off the gas. After gas restoration, it takes time to remove grease. When there is no meter 8 close to both sides in the pipe axis direction of the breakage point of the PE pipe 2 from which gas is leaking and leaking, it cannot be shut off. Therefore, in this prior art, the scope of application is limited.

FIG. 27 is a sectional view showing a vicinity of a broken point 75 where the pipe 2 is damaged by an excavator such as a backhoe. At this broken point 75, a part of the pipe 2
A burr 76 is formed to be bent inward. In order to prevent the tube 2 from spurting from the broken point 75, an airtight flexible bag is inserted into the tube 2 from the broken point 75, and the tube 2
It would be readily conceivable to supply compressed air to the bag inside. In such a configuration, the broken point 75 has a relatively large diameter of, for example, about 20 to 150 mmφ,
Therefore, it is difficult to insert the bag into the tube from the damaged portion 75 in a state where a large amount of gas is being blown out. In particular, the presence of the burr 76 makes it more difficult to insert the bag body. There is also a risk that the bag may be caught and the bag may be damaged, resulting in a loss of airtightness.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that when a large amount of gas is leaked and leaked due to breakage of a pipe for transporting the gas, the large amount of leaked gas can be safely removed by a simple operation. Another object of the present invention is to provide a gas ejection prevention method capable of shutting off gas in a short time, and a pipe piercing repair apparatus and a pipe repair apparatus that are advantageously implemented for the gas ejection prevention method.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a foamable synthetic resin is injected into a pipe for transporting gas, and the foamable synthetic resin is foamed in the pipe to expand its volume and close the pipe. This is a method for preventing gas ejection.

Further, the present invention is characterized in that the foamable synthetic resin forms closed cells by foaming and adheres to the inner surface of the tube.

According to the present invention, when a pipe for transporting gas is broken and a large amount of gas is blown out, a foamable synthetic resin is injected into the pipe, and the foamable synthetic resin is foamed in the pipe to form a gas in the pipe. Close. Such an operation is simple, does not require skill, and can prevent a large amount of gas from leaking out in a short time, and is safe. The tube is made of, for example, a thermoplastic synthetic resin, for example, polyethylene (P
E) and the like, there is a possibility that a large-diameter hole is instantaneously formed by an excavator such as a backhoe and a large flow of gas is ejected. The tube may be made of metal, for example, cast iron. According to the present invention, when such a large flow of gas leaks, the gas can be easily shut off using a foamable synthetic resin. In this way, the material of the expandable synthetic resin is inserted into the broken gas outlet of the pipe, and the foam is made to react and foam in the pipe. The volume expansion of the expandable synthetic resin can prevent the gas from being blown out. By using foamable synthetic resin, only a relatively small amount of material is inserted,
Its volume can be expanded, for example, by a factor of 2 to 50.

According to the present invention, since the foaming is closed cells, it is possible to suppress the transported gas from passing through the foamed synthetic resin. Due to the foam adhesion, there is no gap between the inner wall of the tube and the synthetic resin material after foaming, and there is no gas ejection flow rate due to the gap.

The foamable synthetic resin may be, for example, a thermosetting synthetic resin which reacts on site to form a foam, and is preferably, for example, a thermosetting synthetic resin such as phenol foam or urethane foam. Among the urethane foams, the foamable synthetic resin material may be a rigid foamed polyurethane foam. These materials are readily available commercially and are inexpensive and are preferred in the practice of the present invention.

Further, according to the present invention, the pipe may be made of a metal or a synthetic resin. When the pipe is made of a synthetic resin, the pipe may be made directly from a damaged portion, or when the pipe is made of a synthetic resin, A foamable synthetic resin is injected into a tube from a perforated insertion hole by using a heated piercing tool in the vicinity of the broken point.

According to the invention, the gas-transporting pipe is, for example, a thermoplastic synthetic resin, for example polyethylene (P
E) and the like, and a foamable synthetic resin is injected from a damaged portion where a large amount of gas is ejected.

According to the present invention, it is easy to press a rod-shaped soldering iron, for example, heated above the melting point, onto the surface of a tube made of thermoplastic synthetic resin to melt the tube and perforate it. It is possible. An insertion hole can be easily formed by pressing a rod-shaped piercing tool, which is heated above the melting point of the synthetic resin tube, onto the outer peripheral surface of the tube.
This is particularly preferable from the viewpoint of preventing gas ejection in a short time in an emergency.

Further, according to the present invention, the pipe is made of a synthetic resin, and the pipe is pierced by the tip of a cylindrical piercing tool having a sharp tip. It is characterized by injecting into a pipe from a provided nozzle through a perforated insertion hole.

According to the invention, the gas-transporting pipe is, for example, a thermoplastic synthetic resin, for example polyethylene (P
E), or may be made of a thermosetting synthetic resin, etc., and an insertion hole is formed in the tube by using a cylindrical drill having a sharp tip, and through this insertion hole. Then, a foamable synthetic resin is injected into the pipe from a nozzle provided in the drilling tool.

By forming an insertion hole in a pipe and piercing the pipe, even if the broken point of the pipe is buried by the soil, at a position away from the broken point and at a place where the pipe is exposed from the soil, An insertion hole can be formed in the tube to block gas flowing through the tube, thereby preventing gas from leaking from a broken portion of the tube buried in the soil.

Further, the present invention is characterized in that the inside of the pipe is closed using a foamable synthetic resin on both sides in the axial direction of the pipe including the broken point on the line.

According to the present invention, a foamable synthetic resin is injected on both sides in the axial direction of the broken portion of the tube to close the inside of the tube, thereby easily shutting off leakage of a large amount of gas from the broken portion. be able to.

Further, according to the present invention, a foamable synthetic resin is injected into a tube of a synthetic resin tube for transporting a gas, and the foamable synthetic resin is foamed in the tube to close a damaged portion in the tube, or The foamable synthetic resin is injected on both sides in the pipe axis direction including the broken point on the line with respect to the broken point, and the foamable synthetic resin is foamed in the pipe to close the inside of the pipe. Connect the bypass pipe to the pipe at both outer connecting positions to transfer gas, cut off a part of the pipe including the damaged part between the connecting points of the bypass pipe, and connect a new repair pipe This is a method for preventing gas ejection.

According to the present invention, a foamable synthetic resin is injected into a synthetic resin pipe for transporting gas and foamed to prevent a large amount of gas from leaking from the damaged portion. The foamable synthetic resin can be injected, for example, by perforation, so that a part of the tube having the broken portion can be cut off, and at this time, the gas can be continuously transported using the bypass tube. Thus, even when a large amount of gas leaks, the gas can be continuously supplied without interrupting the gas supply.

Further, the present invention is a method for preventing gas ejection, characterized in that a broken portion of a pipe for transporting gas is covered with a foamable synthetic resin and closed in a foamed state.

According to the present invention, the foamed synthetic resin can cover a broken portion of the tube from outside to prevent a large amount of gas from leaking out. Such an operation is particularly simple and is effective for preventing a large amount of gas from leaking.

According to the present invention, there is further provided a cylindrical drill having a sharp end portion, and a nozzle in which the nozzle hole is disposed axially inward of the drill hole relative to the distal end portion of the drill hole. When,
A foaming synthetic resin is supplied to a nozzle, and the foaming synthetic resin includes a foaming synthetic resin supply source that foams in a pipe and closes the inside of the pipe.

According to the present invention, since the nozzle for ejecting the foamable synthetic resin is provided in the cylindrical piercing tool, the pipe having the damaged portion is pierced, and the piercing operation is followed by the nozzle from the nozzle. By supplying the expandable synthetic resin into the pipe, it is possible to prevent a large amount of gas from leaking and leaking from a damaged portion.

If the soil is not excavated by excavating the soil, the pipe is punctured at the exposed part of the pipe or at a safe place where the leaked gas does not flow.
A foamable synthetic resin can be injected into the tube and closed.

Further, according to the present invention, a flexible bag is inserted into a pipe for transporting gas from a broken portion of the pipe, and a bag in the pipe is inserted into the bag.
This is a method for preventing gas ejection, which comprises injecting a foamable synthetic resin, foaming the foamable synthetic resin in a bag, expanding the volume, and closing the pipe.

According to the present invention, as shown in FIG. 17, a metal or synthetic resin tube for transporting gas is
A flexible bag is inserted from the damaged portion, and then a foamable synthetic resin is injected into the bag, and the foamable synthetic resin is instantaneously foamed in the bag to expand the volume. As a result, the inside of the tube is closed while the outer surface of the bag is in close contact with the inner surface of the tube, and the damaged portion is closed. In this way, it is possible to prevent the gas from leaking from the damaged portion.

Further, according to the present invention, a flexible bag is inserted into a pipe for transporting gas from a broken portion of the pipe, and the bag is expanded in the pipe except for a gas transport space communicating with the pipe axis direction. A gas jet having a shape capable of closing a broken portion of a pipe, injecting an expandable synthetic resin into a bag in the pipe, and expanding the volume by expanding the expandable synthetic resin in the bag. It is a prevention method.

According to the present invention, as described below in connection with FIG. 23, the flexible bag expands within the tube, leaving a gas transport space communicating in the tube axis direction, and a foamable bag is formed in the bag. When the synthetic resin is injected and the volume expands, the broken portion of the tube is closed. In the closed state of the damaged portion, the above-described gas transport space remains in the pipe axis direction. Therefore, it is possible to prevent the gas from leaking from the damaged portion while the gas is transported by the pipe having the damaged portion.

Further, the present invention is characterized in that the bag has elasticity and air permeability. Further, the present invention is characterized in that the bag is constituted by a linear body which is flexible and does not expand and contract, and whose outer surface is surrounded.

According to the present invention, the flexible bag does not expand and contract,
Therefore, in a state where the foamable synthetic resin is injected into the bag and foamed, the bag can surely close the inside of the pipe or the broken portion. The bag may have air permeability, for example, may have a large number of pores, or may have a net shape, as long as the synthetic resin after foaming does not go out of the bag. Since the bag has air permeability in this way, even if air is contained in the bag, the foaming of the foamable synthetic resin causes
Gases such as air in the bag are discharged to the outside, and the inside of the bag is filled with foamed synthetic resin, so that the bag can be sufficiently expanded.

According to the present invention, the outer surface of the bag is partially surrounded by a linear material such as a flexible non-stretchable string, so that when the foamable synthetic resin in the bag is foamed in the pipe, the bag is formed. It can be formed in a desired shape. Therefore, as shown in FIGS. 23 and 25, it is possible to reliably form a gas transport space communicating in the pipe axis direction while keeping the broken part of the pipe closed.

The present invention also provides a guide tube inserted into a tube from a broken portion of the tube, a nozzle provided in the guide tube so as to be displaceable in the axial direction of the guide tube, and a guide tube connected to a nozzle hole of the nozzle. And a flexible bag inserted into the tube from the guide tube and connected to the base end of the nozzle to supply a foamable synthetic resin to the nozzle. And a foaming synthetic resin supply source for expanding the volume and expanding the volume to close the inside of the pipe or a broken portion.

According to the present invention, as will be described later with reference to FIG. 19, with the flexible bag stored in the guide tube, the guide tube is inserted into the tube from the damaged portion, and then the nozzle is moved. The bag is inserted into the tube by moving toward the inside of the tube, and in this state, the foamable synthetic resin is injected from the foamable synthetic resin supply source into the bag inside the tube via the nozzle. As a result, the expandable synthetic resin foams instantaneously in the bag and expands in volume, thereby closing the inside of the pipe, or, as shown in FIG. 23 and FIG. And maintain the active tube state. Thus, by using the piercing repair device of the present invention, it is possible to easily insert a bag into a pipe from a broken portion of the pipe.

[0036]

FIG. 1 is a sectional view of an embodiment of the present invention. A polyethylene pipe (abbreviated as PE pipe) 12 is embedded in soil 11 such as a road or a house site. The pipe 12 is used for transporting combustible gas such as city gas.

FIG. 2 is a diagram showing a state in which excavation of the soil 11 is performed near the pipe 12 using the excavator 13. A backhoe or the like of the excavator 13 may collide with the pipe 12, and a large-diameter damaged portion 14 may be generated. As a result, a large amount of gas is leaked and leaked from the broken point 14 as indicated by reference numeral 20. That is, during construction using the excavator 13, for example, a backhoe or the like collides with the pipe 12, so that a damaged portion 1 having a relatively large diameter is formed.
4 is generated and a large amount of gas is ejected and leaked. Therefore, when the pipe 12 is damaged at the breakage point 14 during the construction work for excavating the soil 11 by the excavator 13 such as a backhoe, the expandable synthetic resin supply device 15 used in the present invention is used to expand the foamable synthetic resin from the breakage point 14. Inject resin and pipe 12
The inside of the tube 12 is closed by the foamed synthetic resin as indicated by reference numeral 16 by foaming inside. In this way, a large amount of gas that leaks out of the damaged portion 14 is prevented.

FIG. 1 also shows a foaming synthetic resin supply device 1.
5 is shown enlarged. By grasping and operating the handle 17, the worker can discharge and supply the foamable synthetic resin stored in the storage section 18 from the nozzle 19. The nozzle 19 is connected to the pipe 1
2 and the foamable synthetic resin is supplied in this inserted state. If the nozzle 19 is lengthened, for example, to about 2 m, it can be inserted from a position distant from the damaged portion 14. Thus, the expandable synthetic resin 16 in the tube 12 is
The inside is closed, and the damaged portion 14 is closed. Thus, according to the present invention, the use of the expandable synthetic resin supply device 15 prevents a large amount of this gas from leaking out.

FIG. 3 is a cross-sectional view showing a state in which the expandable synthetic resin 16 is injected from the damaged portion 14 using the expandable synthetic resin supply device 15. The foamable synthetic resin 16 is
The inside of the pipe 12 is closed, and the broken point 14 formed by the excavator 13 is closed. The present invention can be similarly applied to a case where a large amount of gas leaks, such as corrosion leakage of a medium pressure pipe or breakage of a cast iron pipe in a metal pipe.

In the storage section 18 of the foamable synthetic resin supply device 15, (a) a mixture of a polyol, a foaming agent and a foam stabilizer, and (b) a polyisocyanate are separately stored and prepared. . From the nozzle 19, the mixture a and the polyisocyanate are mixed and discharged from the nozzle 19 and supplied.

The polyol is represented by Formula 1 and reacts with the polyisocyanate to form a urethane resin skeleton. _{R [(CH 2 -CHCH 3 O} ) n -CH 2 -CHCH 3 -OH] m ... (1)

The blowing agent is dichlorofluoroethane CH
₃ CCl ₂ F, a called HCFC-141B, and evaporated in urethane by exothermic urethane reaction to form a foam, closed cell is formed. The foam stabilizer works to make the foam fine and uniform, and may be, for example, a silicon-based surfactant. The polyisocyanate is, for example, polymethylene polyphenyl polyisocyanate, and is represented by Formula 2.

[0043] _{OCN-C 6 H 4 - (} CH 2 -C 6 H 3 -NCO) n -CH 2 -C 6 H 4 -NCO 99% or more (2) e.g. Dan Form Ass Co. Dunn form DX40 When is used, the main components are approximately 4.4% diphenylmethane, 40% or more isocyanate, 5% hydrocarbon, 10% dimethyl ether, and 5% ethanediol.

The physical properties of the hard urethane worm obtained by the foamable synthetic resin supply device 15 thus obtained are as follows.

[0045]

[Table 1]

As a foaming agent, Freon gas (HCFC-
Instead of 141B), it can be foamed with carbon dioxide generated from water and isocyanate.

The foamable synthetic resin forms closed cells by foaming and adheres to the inner surface of the tube 12. As a result, the gas in the tube 12 does not pass through the expandable synthetic resin, and a gap between the outer peripheral surface of the expandable synthetic resin 16 and the inner peripheral surface of the tube 12 is not formed. It can be reliably prevented.

FIG. 4 is a partial sectional view of another embodiment of the present invention. This embodiment is similar to the embodiment of FIGS. 1 to 3 described above, and corresponding parts are denoted by the same reference numerals. Insertion holes 2 are provided on both sides of the pipe 12 in the pipe axis direction (the left-right direction in FIG. 4) with respect to the broken portion 14 of the pipe 12 exposed from the soil 11.
The foamable synthetic resins 23 and 24 are supplied from the insertion holes 21 and 22 using the foamable synthetic resin supply device 15 described above, and the inside of the pipe 12 is closed.
The insertion holes 21 and 22 are closed. As a result, the damaged portion 14
Large amount of gas leaked from the tank can be prevented.

FIG. 5 is a perspective view of a piercing device 26 used for forming the insertion holes 21 and 22 in the tube 12. The drilling device 26 shown in FIG. 5A includes a rod-shaped drilling tool 27 made of a metal material having good thermal conductivity such as aluminum or copper, an electric heater 28 for heating the drilling tool 27, And a gripper 29 that is gripped by a hand of a person, and has a shape similar to a soldering iron. The piercing tool 27
The tube 12 is heated to a temperature equal to or higher than the melting point. Therefore, the insertion holes 21 and 22 can be easily formed by pressing the distal end portion 31 of the piercing tool 27 against the outer peripheral surface of the tube 12. The tip 31 is formed sharply. For example, the piercing tool 27 may be in the shape of a right column, and the distal end portion 31 may have a shape cut at an angle of 90 ° or less, for example, 45 ° with respect to the axis of the piercing tool 27, as shown in FIG.
As shown in (2), the shape may be a round bar.

In the piercing device 26a shown in FIG. 5 (2), an electric heater 28 is embedded in a round bar-shaped piercing tool 27 having a closed end (lower end in FIG. 5 (2)). The gripper 29 is attached to the base end of the tool 27. Electric power is supplied to the electric heater 28 from the flexible electric wire 78.

FIG. 6 is a sectional view showing a piercing repair device 33 according to another embodiment of the present invention. The piercing repair device 33 is
Basically, it includes a piercing tool 34, a nozzle 35 provided in the piercing tool 34, and a foamable synthetic resin supply source 36 for supplying a synthetic resin to the nozzle 35. The piercing tool 34 has a right cylindrical shape, and the tip 37 is sharp and functions as a hole saw. The nozzle 35 is provided coaxially with the piercing tool 34, and the nozzle hole 38 is provided with a tip portion 37 of the piercing tool 34.
It is arranged more inward in the axial direction of the punch 34 (upper in FIG. 6). By arranging the nozzle hole 38 axially inward of the distal end portion 37 as described above, when the tube 12 is pierced at the distal end portion 37 of the piercing device 34 to form the insertion hole 21, the nozzle 35 is There is no hindrance, and a smooth drilling operation is possible. An operation unit 39 is provided in the perforation repair device 33, and the foamable synthetic resin is discharged and supplied from the nozzle 35 by an operation of the operation unit 39 by an operator. The foamable synthetic resin may have the same composition as that described above in connection with the foamable synthetic resin supply device 15 described above.

Using such a piercing repair device 33, the pipe 1
In order to form the insertion hole 21 in the tip 2, the tip 3
7 is pressed against the outer peripheral surface of the tube 12 to act as a hole saw, and an insertion hole 21 is formed and inserted into the tube 12 as indicated by reference numeral 34a. In this inserted state, the nozzle 35
From the nozzle hole 38 of the reference numeral 28a,
The foamable synthetic resin is discharged and supplied at a position in the pipe 12. Thus, the foamable synthetic resin 23 reacts and foams in the tube 12 and is closed. The base end of the piercing tool 34 is connected to a support cylinder 41 having a diameter larger than that of the piercing tool 30, so that insertion into the insertion hole 21 is suppressed, so that operability is good.

The drilling device 26 shown in FIG. 5 and the drilling repair device 33 shown in FIG.
It is also possible that the second broken point 14 is used to increase the pore size to facilitate the injection of the foamable synthetic resin.

Another embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a cross-sectional view showing a state where the pipe 12 buried in the soil 11 is damaged by the excavator 13. The damaged part 14 is buried in the soil 11 and is not exposed. When the excavator 13 collides with the pipe 12, gas is ejected and leaks from the damaged portion 14.

FIG. 8 is a cross-sectional view for explaining a process for preventing the gas from leaking from the damaged portion 14 shown in FIG. An insertion hole 43 is formed at a position where the pipe 12 is exposed from the soil 11 by using a perforation device 26.

FIG. 9 is a cross-sectional view showing steps for preventing the gas from leaking out in the embodiment shown in FIGS. As shown in FIG. 8, after the insertion hole 43 is formed in the pipe 12 at the position exposed from the soil 11 by using the perforation device 26, as shown in FIG. Is inserted. An auxiliary extension nozzle 44 is connected to the nozzle 19. The auxiliary extension nozzle 44 extends in the pipe axis direction into the pipe 12 and extends to the vicinity of the broken point 14 in the soil 11. An operator operates the foamable synthetic resin supply device 15 in a state where the nozzle hole 45 of the auxiliary extension nozzle 44 has reached the vicinity of the broken portion 14 of the tube 12. As a result, the expandable synthetic resin is discharged from the nozzle hole 45 in the pipe 12 and supplied, and as a result, the expandable synthetic resin 46 closes the inside of the pipe 12 and the damaged portion 14
In this manner, thereby preventing a large amount of gas from leaking out. The auxiliary extension nozzle 44 has flexibility, and its base end is detachable from a nozzle hole at the tip end of the nozzle 19. In FIG. 9, the expandable synthetic resin supply device 15 is illustrated in an enlarged manner as compared with the pipe 12 for the sake of illustration. Other configurations and operations of the embodiment shown in FIGS. 7 to 9 are similar to the embodiment of FIGS. 1 to 6 described above.

FIGS. 10 to 16 illustrate another embodiment of the present invention. In the embodiment shown in FIGS. 10 to 16, gas can be continuously supplied even in a state where the broken portion 14 of the pipe 12 buried in the soil 11 is closed. FIG. 10 shows a state in which the pipe 12 is exposed from the soil 11 and is closed at the break point 14 with the expandable synthetic resin 48. Such a state is as shown in FIG.
9 can be achieved.

FIG. 11 is a cross-sectional view showing steps for preventing gas ejection while gas is continuously supplied. FIG.
As shown in FIG. 0, after being closed by the foamable synthetic resin 48 at the broken portion 14 of the tube 12, insertion holes 51 and 52 are formed on both sides (left and right in FIG. 1) in the tube axial direction with respect to the broken portion 14. The expandable synthetic resin 53 and 54 are supplied into the tube 12 using the expandable synthetic resin supply device 15 and closed.

FIG. 12 is a diagram showing steps for preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. 10 and 11. FIG.
As shown in the figure, after the tube 12 is closed by the expandable synthetic resins 53 and 54 on both sides in the tube axis direction of the broken point 14,
The foamable synthetic resin 5 on both sides in the pipe axis direction with respect to the broken point 14
Connection positions 5 further outward in the pipe axis direction than 3, 54
At 6,57, the connecting devices 58,59 such as saddles are connected to the pipe 12
To the outer surface of

FIG. 13 is a cross-sectional view for explaining the step of preventing gas ejection while continuously supplying gas in the embodiment shown in FIGS.
A bypass pipe 61 is connected to the connection tools 58 and 59. In this way, the gas in the pipe 12 can flow continuously by bypassing the fittings 58 and 59 and the bypass pipe 61.

FIG. 14 is a cross-sectional view for explaining steps of preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. A portion of the tube 12 is cut off as shown by reference numeral 62 inside the tube axis with respect to the foamable synthetic resin 53 and 54 closing the inside of the tube 12.

FIG. 15 is a cross-sectional view for explaining steps of preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. A new repair tube 63 is prepared at the cut off portion 62 of the tube 12 shown in FIG. Tube 63 is tube 1
2 and may be made of synthetic resin such as polyethylene. One end of the pipe 63 may be connected, for example, by a flange joint 64, and the other end may be connected by a mechanical pipe joint 65. The mechanical fitting 65 has a large-diameter cylindrical portion 67 into which one end 66 of the pipe 12 fits, and an annular sealing member 68 is inserted into the large-diameter cylindrical portion 67 to form an inner surface of the large-diameter cylindrical portion 67. And the outer surface of one end 66 of the tube 12 is hermetically closed and connected.

FIG. 16 is a cross-sectional view for explaining the steps for preventing gas ejection while continuously supplying gas in the embodiment shown in FIGS. Tube 1
After the repair pipe 63 is connected to the second pipe 2, the bypass pipe 61 is removed, and the connection tools 58 and 59 are closed. After that, the soil 71 is backfilled. Thus, the repair process is completed.

In the embodiments of FIGS. 1 to 4, the embodiments of FIGS. 7 to 9 and the embodiments of FIGS.
2, a punching device 26 can be used to punch
In addition, it is possible to perform perforation using the perforation repairing device 33 shown in FIG. 6 and supply foamable synthetic resin.

FIG. 17 is a partial sectional view of an embodiment of the present invention. This embodiment is similar to the above-described embodiment, and corresponding portions are denoted by the same reference numerals. When a broken portion 14 is formed in the tube 12 in the soil, the tube 12
The flexible bag 81 is inserted into the tube 12 from the damaged portion 4 of
In the tube 12, a foamable synthetic resin 82 is injected from a foamable synthetic resin supply device 15 into a bag 81. As a result, the synthetic resin foams in the bag 81 in the tube 12, and the foamed synthetic resin 82 closes the inside of the tube 12 and closes the damaged portion 14. In this way, a large amount of gas that leaks out of the damaged portion 14 is prevented.

FIG. 18 is a simplified sectional view showing a state in which the expandable synthetic resin is supplied from the expandable synthetic resin supply device 15 in the embodiment shown in FIG. The foamable synthetic resin from the foamable synthetic resin supply device 15 is supplied to the bag 81 through a relatively long nozzle 19a of, for example, about 2 m.
Is supplied within. By configuring the nozzle 19a to be relatively long as described above, the work can be performed without the work vehicle approaching the damaged portion 14 where a large amount of gas is jetted out, and safety is maintained. Foaming synthetic resin supply device 1
The pipe repair device 84 includes the nozzle 19a, the bag 81, and the like.

FIG. 19 is an enlarged sectional view of a part of the pipe repair apparatus 84 shown in FIG. The substantially straight cylindrical guide tube 85 can be inserted into the tube 12 from the broken portion 14 of the tube 12. The nozzle 19a is provided so as to be displaceable in the guide cylinder 85 in the axial direction of the guide cylinder 85 (vertical direction in FIG. 19). The distal end portion 86 of the guide cylinder 85 has a shape that is cut obliquely at an angle of, for example, 45 degrees with respect to the axis of the guide cylinder 85, whereby the guide cylinder 85 can be inserted into the pipe 12 from the damaged portion 14. Becomes easier. The opening portion 86 of the bag 81 is connected to the nozzle hole 38a of the nozzle 19a. These guide cylinder 85 and nozzle 19a are rigid. The bag 81 is housed in the guide tube 85 as shown in FIG. 19, and moves relatively from the guide tube 85 toward the pipe 12 toward the pipe 12 as shown in FIGS. 81 can be pushed into the tube 12 and inserted.

FIG. 20 is a sectional view showing a state in which the bag 81 is inserted into the pipe 12 from the damaged portion 14 using the pipe repairing device 84 shown in FIG. First, as shown in FIG. 19, the guide cylinder 85 is inserted into the damaged portion 14 with the bag 81 stored in the guide cylinder 85. Next, the nozzle 19a is moved into the pipe 12 with the guide cylinder 85 stopped so as not to move with respect to the pipe 12. Thereby, the bag 81 is inserted into the tube 12. Therefore, the broken point 1 of the pipe 12
Even if the burrs 76 shown in FIG. 27 exist in FIG. 4, the bag 81 is not caught by the burrs 76, and
1 can be reliably inserted into the tube 12.

FIG. 21 is a cross-sectional view showing a state in which the expandable synthetic resin 82 is injected into the bag 81 in the pipe 12 by the repairing device 84. As shown in FIG.
After the bag 81 is inserted into the inside, the guide tube 85 is moved from the inside of the tube 12 to the upper side 102 in FIG. In this state, the foamable synthetic resin is instantaneously injected from the foamable synthetic resin supply device 15 through the nozzle 19a to the opening 86 of the bag 81 from the nozzle hole 38a. Thus, the foamable synthetic resin 82 in the bag 81
Reacts instantaneously with foaming, closing the inside of the tube 12,
The breakage point 14 is closed. In this way, it is possible to prevent a large amount of gas from being leaked from the damaged portion 14. Other configurations of the embodiment shown in FIGS. 17 to 21 are the same as those of the above-described embodiment.

FIG. 22 is a sectional view of another embodiment of the present invention. In this embodiment, a broken point 1
A plurality of (for example, two) bags 88, 89 are inserted from the bag 4, and the foamable synthetic resin is supplied from the common nozzle 19b to the bag 8 in the tube 12.
8,89. Other configurations are similar to the above-described embodiments of FIGS. 17 to 21 in particular.

FIG. 23 is a sectional view of another embodiment of the present invention. This embodiment is similar to the above-described embodiment, and corresponding portions are denoted by the same reference numerals. The foamable synthetic resin 92 is supplied into the bag 91 in the tube 12 and foamed. It should be noted that in this embodiment, the synthetic resin 92 is used.
Is expanded and expanded, and the pipe 12
Although the pipe 4 is closed, the gas transport space 93 communicating in the pipe axis direction (the left-right direction in FIG. 23) is left inside the pipe 12 and is expanded. Therefore, the gas transported in the pipe 12 continues to be transported through this space 93. A part of the bag 91 is provided at intervals by the endless annular linear bodies 95 and 96 in the pipe axis direction of the pipe 12 (the left-right direction in FIG. 23) with respect to the breakage point 14. Thus, the linear bodies 95 and 96 surround the outer surface of the bag 91. The bag body 91 also
In a state where the synthetic resin 92 is housed and foamed, the portion has an expanded portion 97 outside the damaged portion 14. In this way, the bag body 91 securely closes the damaged portion 14.

FIG. 24 is a sectional view showing the natural state of the bag 91 shown in FIG. In its natural state, the bag 91 has a round dish shape and is connected to the linear bodies 95 and 96, the opening 98, and the nozzle 19c.

FIG. 25 is a sectional view of another embodiment of the present invention. This embodiment is similar to the embodiment of FIGS. 23 and 24, and corresponding parts are denoted by the same reference numerals. In the bag 91, the linear bodies 95, 96
The outer surface of the bag body 91 is surrounded by an endless ring. The linear bodies 95 and 96 have flexibility as described above,
It has a configuration that does not expand or contract. The bag 98 has an opening 98.
Is connected to the nozzle 19c. FIG. 25
Also in the embodiment of the present invention, when the foamable synthetic resin is injected into the bag 91 and foamed, the expansion of the bag 91 is limited by the linear members 95 and 96, and the gas is exchanged between the bag 91 and the inner surface of the tube 12. A transport space 93 is formed in the tube axis direction. In this way, it is possible to prevent a large amount of gas from leaking from the broken portion 14 of the pipe 12 without interrupting gas transport in the live pipe state.

The bags 81, 88, 89, and 91 are made of a material that is flexible, does not expand and contract, and has air permeability. Such a material may be made of a material such as synthetic resin, rubber, and animal leather.

The present invention can be practiced not only in connection with tubes made of synthetic resin materials such as polyethylene, but also in connection with tubes made of other materials, for example metals such as cast iron. it can.

[0076]

According to the present invention, it is possible to close a damaged portion where a large amount of gas is squirted and leaked from a pipe in a short time, without any skill and with a simple operation. become. Such an expandable synthetic resin is easily commercially available, inexpensive, and easily realizes the present invention.

Further, by using the perforation repairing apparatus of the present invention, the foaming synthetic resin can be injected into the pipe following the perforation work, and the workability is further improved.

According to the present invention, a bag is first inserted into a tube having a broken portion, and then the synthetic resin foamed in the tube by injecting a foamable synthetic resin into the bag is used to remove the closed or broken portion in the tube. Can be reliably used for closing, and the foamed synthetic resin is prevented from moving in the pipe, and the foamable synthetic resin can be effectively used for closing.

Further, according to the present invention, the broken portion of the pipe is closed while leaving the gas transport space, whereby the pipe can be kept in an active pipe state.

According to the perforation repairing apparatus of the present invention, the bag is guided into the pipe by the nozzle and inserted while the guide tube is inserted into the damaged portion of the pipe, and the foamable synthetic resin is supplied into the bag in the pipe. It is easy to insert the bag into the pipe from the damaged part, and even if a large amount of gas is squirting and leaking from the damaged part, it is necessary to securely close the pipe or the damaged part. Will be able to

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which excavation of soil 11 is being performed near a pipe 12 using an excavator 13;

FIG. 3 is a cross-sectional view showing a state in which an expandable synthetic resin 16 is injected from a damaged portion 14 using an expandable synthetic resin supply device 15;

FIG. 4 is a partial cross-sectional view of another embodiment of the present invention.

FIG. 5 is a perspective view of a punching device 26 used for forming insertion holes 21 and 22 in the tube 12.

FIG. 6 is a sectional view showing a piercing repair device 33 according to another embodiment of the present invention.

FIG. 7 shows a pipe 12 buried in soil 11
It is sectional drawing which shows the state at the time of being damaged by.

FIG. 8 is a cross-sectional view for explaining a process for preventing the gas from leaking from the damaged portion 14 shown in FIG. 7;

FIG. 9 is a cross-sectional view showing a step of preventing gas from leaking out in the embodiment shown in FIGS. 7 and 8;

FIG. 10 shows a pipe 12 exposed from soil 11 and a broken point 1
FIG. 4 is a view showing a state where the foamable synthetic resin is closed in FIG.

FIG. 11 is a cross-sectional view showing a step of performing gas ejection prevention in a state where gas is continuously supplied.

FIG. 12 is a diagram showing steps for preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. 10 and 11.

FIG. 13 is a cross-sectional view for explaining a step of preventing gas ejection while continuously supplying gas in the embodiment shown in FIGS. 10 to 12;

FIG. 14 is a cross-sectional view for explaining a step of preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. 10 to 13;

FIG. 15 is a cross-sectional view for explaining steps of preventing gas ejection while continuously supplying gas in the embodiment of the present invention shown in FIGS. 10 to 14;

FIG. 16 is a cross-sectional view for explaining a step of preventing gas ejection while continuously supplying gas in the embodiment shown in FIGS. 10 to 15;

FIG. 17 is a partial cross-sectional view of one embodiment of the present invention.

18 is a simplified cross-sectional view showing a state in which the expandable synthetic resin is supplied from the expandable synthetic resin supply device 15 in the embodiment shown in FIG.

19 is an enlarged cross-sectional view of a part of the drilling repair device 84 shown in FIG.

20 is a cross-sectional view showing a state in which the bag 81 is inserted into the pipe 12 from the damaged portion 14 using the piercing repair device 84 shown in FIG.

FIG. 21 is a cross-sectional view showing a state in which an expandable synthetic resin 82 is injected into a bag body 81 in a pipe 12 by a repair device 84.

FIG. 22 is a sectional view of another embodiment of the present invention.

FIG. 23 is a sectional view of another embodiment of the present invention.

24 is a cross-sectional view showing a natural state of the bag 91 shown in FIG.

FIG. 25 is a sectional view of another embodiment of the present invention.

FIG. 26 is a simplified cross-sectional view for explaining the prior art.

FIG. 27 is a sectional view showing the vicinity of a damaged portion 75 of the pipe 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Soil 12 Polyethylene pipe 13 Backhoe 14 Breakage point 15 Foamable synthetic resin supply device 16, 23, 24 Foamable synthetic resin 17 Gripping portion 18 Storage portion 19 Nozzle 26 Drilling device 27, 34 Punching tool 28 Electric heater 33 Drilling and repairing device 35 Nozzle 36 Foamable synthetic resin supply source 38 Nozzle hole 58, 59 Connector 61 Bypass pipe 63 Repair pipe 81; 88, 89; 91 Bag 82, 92 Foamable synthetic resin 84 Pipe repair device 85 Guide cylinder 86 Opening 95, 96 linear body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromitsu Nishimura 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Shigenobu Mangi, Hirano-cho, Chuo-ku, Osaka 1-2, Osaka Gas Co., Ltd. (72) Inventor Yuzo Kagawa 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture (72) Inventor Seiji Yamada, Chuo-ku, Osaka City, Osaka Prefecture 4-1-2 Hirano-cho Osaka Gas Co., Ltd. F-term (reference) 3H025 DA02 DB12 DC01 DD01

Claims (13)

[Claims] 1. A method for preventing gas ejection, comprising injecting a foamable synthetic resin into a pipe for transporting gas, foaming the foamable synthetic resin in the pipe, expanding the volume, and closing the pipe. . 2. The method according to claim 1, wherein the foamable synthetic resin forms closed cells by foaming and adheres to the inner surface of the tube. 3. The tube is made of a synthetic resin, and foamable synthetic resin is injected into the tube from a damaged portion or from a vicinity of the damaged portion through a drilled insertion hole using a heated piercing tool. The method for preventing gas ejection according to claim 1 or 2, wherein the gas ejection is performed. 4. The pipe is made of synthetic resin, and the pipe is pierced by the tip of a cylindrical drill having a sharp tip, and a foaming synthetic resin is provided in the drill. From the nozzle
3. The method according to claim 1, wherein the gas is injected into the pipe through a perforated insertion hole. 5. The pipe according to claim 1, wherein the pipe is closed with a foamable synthetic resin on both sides in the pipe axis direction including the broken point on the line. The gas ejection prevention method described in the above item. 6. A synthetic resin tube for transporting a gas,
Inject the foamable synthetic resin, foam the foamable synthetic resin in the pipe, close the broken point in the pipe, or, on the broken line, apply the foamable synthetic resin on both sides in the pipe axis direction including the broken point. Inject the foamable synthetic resin in the tube to foam it in the tube and close the inside of the tube, and connect the bypass pipe to the pipe at a connection position on both outer sides in the pipe axis direction from both sides in the pipe axis direction to supply gas. A method for preventing gas ejection, wherein a part of a pipe including a damaged portion is cut off between connection positions of a bypass pipe and a new repair pipe is connected, in a state where the pipe is transported. 7. A method for preventing gas ejection, wherein a broken portion of a pipe for transporting gas is covered with a foamable synthetic resin and closed in a foamed state. 8. A cylindrical drill having a sharp distal end, a nozzle in which a nozzle hole is disposed axially inward of the drill relative to the distal end of the drill, and a nozzle. A foamable synthetic resin, the foamable synthetic resin comprising a foamable synthetic resin supply source for foaming in the pipe and closing the inside of the pipe. 9. A flexible bag is inserted into a pipe for transporting gas from a broken portion of the pipe, and a foamable synthetic resin is injected into a bag in the pipe. A method for preventing gas ejection, characterized by foaming and expanding the volume to block the inside of a pipe. 10. A flexible bag is inserted into a pipe for transporting gas from a broken portion of the pipe, and the bag expands while leaving a gas transport space communicated in the pipe axial direction in the pipe to break the pipe. A method for preventing gas ejection, characterized by having a shape capable of closing a part, injecting a foamable synthetic resin into a bag in a pipe, and foaming the foamable synthetic resin in the bag to expand the volume. 11. The method according to claim 10, wherein the bag has elasticity and air permeability. 12. The gas ejection prevention method according to claim 11, wherein the bag is a linear body having flexibility and not expanding and contracting, and the outer surface thereof is surrounded. 13. A guide tube inserted into a tube from a broken portion of the tube, a nozzle provided in the guide tube so as to be displaceable in the axial direction of the guide tube, and connected to a nozzle hole of the nozzle and housed in the guide tube. A flexible bag inserted into the tube from the guide tube, and connected to the base end of the nozzle to supply a foamable synthetic resin to the nozzle, and the foamable synthetic resin foams in the bag in the tube. A foamable synthetic resin supply source that expands in volume to close the inside of the tube or a broken portion.