JPH0333958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe sealing method that can completely prevent or repair leaks in pipes such as gas pipes with simple operations.

[Conventional technology]

In piping such as gas pipes, small gaps may occur at the threaded fitting part of the pipe due to factors such as poor threading, insufficient tightening force, and loss of sealant. Accidents may occur in which passing fluid such as gas leaks from this gap.

In this type of leakage accident, most pipes are built inside the building, such as inside concrete or walls, so it is difficult to locate the leakage point, or it is necessary to remove the interior or concrete pipes for repair. This necessitates restoration, which not only increases the cost of restoration, but also causes problems such as a long period of time required for repair. Especially in recent years,
With the increase in the number of steel-reinforced housing complexes, buildings, etc., pipe leakage repair is becoming increasingly complex, and various repair methods that solve this problem are being developed.

For example, the following repair method is conventionally known as a repair method that solves the above-mentioned problem. That is, a method is known in which first, a sealant is mechanically foamed using a foaming device, the foamed sealant is filled under pressure into a pipe, and a leakage location is sealed with the foamed sealant.

[Problems to be solved by the invention] However, as mentioned above, this method requires a foaming device for foaming the sealant, and also a pressurizing device for filling the foam into the piping under pressure. Furthermore, these devices require skilled operators to operate them safely. Furthermore, in this method, the sealant is foamed by mechanical foaming, resulting in non-uniform foam density.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe sealing method that can completely prevent or repair leaks in pipes such as gas pipes with a simple operation, and which improves the above-mentioned drawbacks.

[Means for solving problems]

In order to achieve the aforementioned object, according to the present invention:
The piping is filled with an aerosol-type foam sealant made by adding a propellant to a water-based resin selected from the group of emulsions and latexes as the main component, and 0.05 to 0.5 Kg/ After maintaining the pressure within the range of cm ² and then draining the excess sealant from the piping, the water in the sealant is evaporated and the sealant is solidified. It is characterized by the ability to completely prevent or repair leaks with simple operations.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using the accompanying drawings. The drawing is a specific explanatory diagram of the piping sealing method according to the present invention, and numeral 1 indicates piping. Piping 1 is usually
For example, a meter union (not shown) is placed at the location indicated by S, but prior to implementing the present invention,
First, remove this meter union and attach the sealant filling connector X here. This connector X is equipped with a pressure gauge 2. Furthermore, prior to implementing the present invention, a spray can 4 filled with a sealant is connected to a connector Remove and attach hoses to these locations, and all hoses attached to pipe 1 (these are indicated by designation numbers 5, 6, 7, and 8, respectively, in the figure).
close.

Next, in carrying out the present invention, first open the tank 5 closest to the point S where the meter union was installed, place a sealant recovery tank (not shown) there, and then pour the sealant from the spray can 4. When injected, the sealant becomes foamy and fills into the pipe 1 from the nozzle 3 via the connector X. At this time, it is preferable that the filling pressure not exceed 0.5 Kg/cm ² . This is because if the piping is old, there is a risk of it breaking in areas where its strength has weakened.

The injection of the sealant is stopped when the sealant flows out from the pot 5, and the pot 5 is promptly closed. At this time, the line of the piping 1 from point S to point A to the pot 5 is filled with the foam sealant. Next, open the pot 6 and repeat the same injection operation as described above to fill the line from point A to point B and C to the pot 6 with foam sealant, then open the pot 7 and repeat the injection operation as described above. Repeat these operations to fill the line from point B to point D and E to point 7 with foam sealant.Finally, open tip 8 and repeat the same operations as above to fill the line from point D to point F. Then, the line leading to Kotoku 8 is filled, and the filling operation is completed.

After filling all the pipes with the foam sealant as described above ^{, spray until the pressure gauge 2 of} connector A foam sealant is injected into the pipe 1 from the can 4 to pressurize the pipe 1, and this pressurized state is maintained for a period of time, for example, until the sealant enters the leakage point, for example, a gap in a screw fitting part. Hold for 10 minutes.

If the pressurization does not reach 0.05 Kg/cm ² , the foam sealant will not penetrate into leakage points such as gaps, and therefore leakage in the pipes will not be sufficiently prevented or repaired. Furthermore, the pressurization is 0.5Kg/cm ²
If it exceeds this, as mentioned above, there is a risk that the parts where the strength of the piping is weakened will be damaged. Also,
The holding time is arbitrary; the greater the pressure, the shorter the holding time, and the smaller the pressure, the longer the holding time.

After the above-mentioned pressurization is completed, the nozzle 3 is pulled out from the connector X, the spray can 4 is removed, and a nitrogen or air cylinder (not shown) for discharging excess sealant is attached thereto. Next, open the tank closest to the meter union position S, for example, the tank 5 in the drawing, place the sealant recovery tank there, and then open the nitrogen or air cylinder to feed nitrogen or air into the pipe 1. , the excess sealant in the pipe 1 is discharged from the pot 5. This sealant was filled in the line from the position S of the piping 1 to the point A to the pot 5. Eventually, when the discharge from the pot 5 is completed, the pot 5 is closed. Next, open the pot 6 and perform the same operation as described above to discharge the sealant filled in the line from point A to point B and C to the pot 6 from the pot 6, until almost no more is being discharged. Close Kotoku 6 at that point. Furthermore, the sealant 7 is opened and the same operation as described above is performed, and the sealant filled in the line from point B to point D and E to the bottle 7 is discharged from the bottle 7, and when this discharge is finished, Close Kotoku 7. Next, open the pot 8 and perform the same operation as described above to discharge the sealant filled in the line from point D to point F to the pot 8 from the pot 8, and when this discharge is completed, the pot 8 is closed, and the discharge of the excess sealant in the pipe 1 is completed. In the above-mentioned sealant discharge operation, it is preferable to increase the pressure inside the pipe 1 by supplying nitrogen or air until the pressure gauge 2 reaches 0.2 kg/cm ² .

After completing the above-mentioned discharge work, open each pot and let it cure for about 45 minutes. Eventually, the moisture in the sealant will evaporate and solidify into a solid substance. As a result, the inner wall of the pipe will be covered with a film of solid substance. In addition to preventing leaks, leakage points such as gaps are filled with solid material to repair leaks. At this time, the remaining gases are naturally released.

The sealant used in the above-mentioned method of the present invention is an aerosol type sealant which has a water-based resin selected from the group of emulsions and latexes as its main component, to which a propellant is added.

Examples of the above-mentioned emulsions include acrylic ester emulsions (polymethyl acrylate,
ethyl or butyl, polymethyl methacrylate,
Examples of the latex include NR latex, SBR or BR latex, Various natural or synthetic rubber latexes may be mentioned, such as IR latex.

The sealant according to the present invention has the above-mentioned emulsion or latex water-based resin as its main component, and additives such as a freeze stabilizer, a rust preventive agent, a nonionic surfactant, and a PH regulator are added and mixed therein. It is prepared by preparing a stock solution of the sealant, and adding and mixing a propellant to this stock solution.

Freeze stabilizers are useful for improving storage stability at low temperatures (for example, 0 to -5°C) and for preventing freezing during injection, and specific examples thereof include alcohols. The amount used is 5 to 10 parts by weight per 100 parts by weight of the water-based resin.

The rust preventive agent exhibits an initial rust preventive effect on metals, and includes, for example, dicyclohexylamine. The amount used is 2 to 15 parts by weight per 100 parts by weight of the water-based resin.

The nonionic surfactant increases the solubility of the propellant and water-based resin and stabilizes the foamability or foam density, and also allows the contained propellant to be discharged from the sealant during curing after construction. Specifically, the former is a polyhydric alcohol fatty acid ester such as sorbitan monolaurate, and the latter is a polyoxyethylene/polyoxypropylene polymer. The amount of each of these used is 0.1 to 0.5 parts by weight per 100 parts by weight of the water-based resin.

The PH adjuster improves the storage stability of the water-based resin, and is specifically aqueous ammonia. The amount used is 0.1 to 0.2 per 100 parts by weight of water-based resin.
Parts by weight.

The propellant is a sealant that is injected into the piping.
It also stabilizes foaming properties, specifically fluorinated chlorinated hydrocarbons (Freon gas), LPG.
Gases such as CCl ₂ F ₂ (Freon 12) and
A mixture of two types of CClF ₂ -CClF ₂ (Freon 114) is preferred. This compounding ratio is such that the pressure required to inject the sealant into the piping in the form of foam is achieved, and the compatible compounding amount is Freon 12:Freon 114=70-80:20-30 (wt%). ).

Specific formulation examples of the sealant according to the present invention are as follows.

Stock solution (parts by weight) Primal N-580S (butyl acrylate polymer.
(produced by Rohm and Haas, Inc., USA) ...100 Nonio LP-20R (sorbitan monolaurate, produced by Nippon Oil & Fats Co., Ltd.) ...0.15 Lasmin V-4 (rust inhibitor manufactured by Kyoeisha Yushi Chemical Co., Ltd.) ... 2 Ammonia water (PH adjuster) ……0.2 Pluronik L-61 (polyoxyethylene/polyoxypropylene polymer. Nonionic surfactant manufactured by Asahi Denka Co., Ltd.) …0.2 Solmics H-11 (Nippon Kasei Co., Ltd.) Freeze stabilizer manufactured by Co., Ltd.)...8 Ion-exchanged water...60 Propellant Freon 12/Freon 114 = 80/20 (parts by weight) Sealing agent 7.7 volume% of the above propellant was added to 92.3 volume% of the stock solution and mixed. Prepared by

[Effect]

In the pipe sealing method according to the present invention, the aerosol type foam sealant prepared as described above is injected into the pipe and the pressure inside the pipe is maintained at 0.05 kg/cm ² or more, thereby achieving the following effect. It is something that can be played.

(a) Since foaming of the sealant is achieved by chemical foaming using a propellant, there is no need for a foaming device as in the past.

(b) Since the sealant is an aerosol type sealant containing a propellant, it can be easily sprayed and filled into piping due to its own spraying ability, and does not require a pressurizing device for filling as in the past.

(c) As mentioned above, since neither a foaming device nor a pressurizing device is required, skilled operators are not required to operate them.

(d) The propellant is dissolved in the water-based resin, and the sealant is injected in this state, so the bubbles are fine and uniform, and the foam density is non-uniform, unlike foam produced by conventional mechanical foaming. There is no such thing.

(E) After filling, the inside of the pipe is maintained at a pressure of 0.05Kg/cm ² or more, so the sealant is distributed not only to the inner wall of the pipe but also to gaps, etc., making leakage prevention and repair possible. .

〔Effect of the invention〕

As described above, the pipe sealing method according to the present invention can completely prevent or repair leaks in pipes such as gas pipes with extremely simple operations, and is an extremely useful method in practice.

[Brief explanation of the drawing]

The drawing shows a specific explanatory view of the piping sealing method according to the present invention. 1...Piping, 2...Pressure gauge, 3...Nozzle, 4
...Spray can, 5, 6, 7, 8... Kotoku, X
...connector.

Claims (1)

[Claims] 1 Fill piping with an aerosol-type foam sealant made by adding a propellant to a water-based resin selected from the group of emulsions and latexes as the main component, and transport 0.05 to 0.5 kg of this filled piping inside. / ^cm2
1. A method for sealing piping, comprising: maintaining the pressure at a pressure within a range of 1, then draining excess sealant from the piping, and then volatilizing water in the sealant to solidify the sealant.