JP7207668B2 - Hot water supply copper pipe renewal method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for rehabilitating copper pipes for hot water supply.

A hot water supply copper pipe is a pipe used for supplying hot water to a faucet in a house such as a detached house or an apartment building.

In general, copper pipes for hot water supply are constructed using metal, etc., but as long as metal is used, corrosion such as rust may occur on the inner surface, and if this corrosion increases, the hot water supply function will be hindered. Not only that, but it can also pose health risks.

On the other hand, for example, Patent Document 1 below discloses a method for repairing a drain pipe.

Japanese Patent No. 5534096

However, the method described in Patent Literature 1 is applied to a drain pipe for draining sewage, and cannot be applied as it is to a lining that is clean water. The reason for this is that the lining generally uses a paint such as an epoxy resin, and if resin or the like is used without special measures, there is a risk that the paint will melt into the hot water. This is a serious risk that can lead to health hazards in some cases.

Further, the hot water supply copper pipe includes a main pipe from the water heater side and a plurality of branch pipes branched from the main pipe, and many of the branch pipes are bent at about 90 degrees. That is, it is difficult to apply the repair method of the drain pipe as it is.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for rehabilitating hot water supply pipes that does not affect water quality and that can be applied to structures unique to copper pipes for hot water supply.

A method for regenerating a hot water supply copper pipe according to one aspect of the present invention for solving the above problems includes the step of pre-drying the inside of the hot water supply copper pipe, connecting a polishing hose to the hot water supply copper pipe and applying an abrasive to the inside of the hot water supply copper pipe. a step of introducing paint into the polished copper pipe for hot water supply and applying it to the inner wall of the copper pipe for hot water supply; a step of drying the inner wall of the copper pipe for hot water supply after drying; a step of filling the inside of the pipe with hot water and curing with hot water.

Moreover, from this point of view, although not limited, the hot water curing is preferably performed with hot water having a temperature of 50°C or higher and 90°C or lower.

Moreover, from this point of view, although not limited, the hot water curing is preferably performed for 20 minutes or more and 1 hour or less.

Moreover, in this aspect, the method for rehabilitating a copper pipe for hot water supply according to claim 1, although not limited, wherein the hot water curing is performed a plurality of times.

In this aspect, although not limited, the paint is an epoxy resin that is cured by mixing a main agent and a curing agent, and the main agent is a bisphenol F type epoxy resin of 70% by weight or more and 95% by weight. %, titanium oxide in the range of 2 wt% to 20 wt%, silica in the range of 0.2 wt% to 10 wt%, the curing agent contains 10 wt% to 60 wt% of modified aliphatic polyamine, isophorone diamine 50% by weight, silica in an amount of 0.2% to 10% by weight, and phthalocyanine blue in an amount of 0.2% to 10% by weight.

Further, in this aspect, although not limited, the step of connecting a polishing hose to the hot water supply copper pipe and introducing an abrasive into the inside of the hot water supply copper pipe for polishing may include one of the hot water supply copper pipes. A first step of introducing an abrasive into the inside of the hot water supply copper pipe from the side of the hot water supply copper pipe for polishing, and after the first step, introducing an abrasive into the inside of the hot water supply copper pipe from the other side of the hot water supply copper pipe and a second step of introducing and polishing.

In this aspect, although not limited, in the step of connecting a polishing hose to a hot water supply copper pipe and introducing an abrasive into the inside of the hot water supply copper pipe for polishing, one of the hot water supply copper pipes The first step of introducing an abrasive into the inside of the hot water supply copper pipe from the side and polishing it is to sequentially polish the inside of the hot water supply copper pipe between two adjacent faucets from one side, In the second step of introducing an abrasive into the inside of the hot water supply copper pipe from the other side of the hot water supply copper pipe and polishing, the inside of the hot water supply copper pipe between two adjacent faucets is sequentially polished from the other side. It is preferable that the

Also, in this aspect, but not limited to, the step of introducing paint into a polished copper hot water pipe and applying it to the inner wall of said hot water copper pipe includes a faucet on one side and a faucet Apply the paint to the hot water supply copper pipe between the faucet located farthest from the paint, and then apply the paint to the hot water supply copper pipe between the faucet located next farthest, It is preferable to do this step by step and finally apply the paint to the inside of the hot water supply copper pipe between the nearest faucet.

Also, in this aspect, but not limited to, between the step of introducing paint into the polished copper water pipe and applying it to the inner wall of the hot water pipe and the step of post-drying the inner wall of the hot water pipe. preferably includes the step of adjusting the thickness of the paint.

In addition, in this aspect, although not limited, the step of adjusting the thickness of the paint is performed at a position closest to the distance from the faucet on one side between the plurality of faucets of the copper pipe for hot water supply. Adjusting the thickness of the paint in the copper pipe for hot water supply between a certain faucet, and then adjusting the thickness of the paint in the copper pipe for hot water supply between the next nearest faucet, and finally, it is preferable to adjust the thickness of the paint in the hot water supply copper pipe between the farthest faucet.

As described above, according to the present invention, it is possible to provide a method for rehabilitating hot water supply pipes that does not affect water quality and that can be applied to structures unique to copper pipes for hot water supply.

FIG. 4 is a diagram showing an image of sending compressed air into a hot water supply copper pipe. FIG. 4 is a diagram showing an image of sending an abrasive into a hot water supply copper pipe. FIG. 4 is a diagram showing an image of feeding paint into a copper pipe for hot water supply;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be implemented in many different forms, and the specific examples described in the embodiments and examples shown below can be modified and adjusted as appropriate, and are limited to these. is not.

(Method for Renewing Copper Pipes for Hot Water Supply)
The method for rehabilitating a hot water supply copper pipe (hereinafter referred to as "this method") according to the present embodiment includes (1) a step of pre-drying the inside of the hot water supply copper pipe, (2) connecting a polishing hose to the hot water supply copper pipe. (3) introducing a paint into the polished copper pipe and applying it to the inner wall of the copper pipe; (4) copper pipe for hot water supply. (5) After drying, the inside of the hot water supply copper pipe is filled with hot water to cure with warm water. The details of each step and their effects will become clear from the description below, but according to this method, there is provided a hot water supply pipe rehabilitation method that does not affect water quality and can be applied to the structure unique to copper pipes for hot water supply. can do.

First, the method has a step of (1) pre-drying the inside of the hot water supply copper pipe. "Pre-drying" is the process of drying the inside of the hot water supply copper pipe. No other technical intent. By drying the inside of the hot water supply copper pipe, each step described below can be reliably performed.

Moreover, before this step, it is preferable to diagnose whether there is durability for about 10 years after the implementation of this method, prior to implementation of this method. As a result, it is possible to propose the feasibility of construction and the renewal of parts that cannot withstand construction (replacement with new parts, etc.), making it possible to rehabilitate copper pipes for hot water supply more reliably. In other words, "rehabilitation" refers to restoring the functions of copper pipes for hot water supply that have already been installed in a house and have been used for a long time without replacing them with new ones. It is also included in this "rehabilitation" to revive it.

In addition, prior to implementing this method of rehabilitating copper pipes for hot water supply, we also created a construction plan, explained the implementation details of this method to residents, made neighborhood measures and various notifications, opened a construction office, It is preferable to bring in materials and provide a temporary water supply.

In addition, in this step, it is preferable to remove (a) valves, machinery, equipment (water faucets, etc.) before performing this step. By doing so, it is possible to stably arrange various hoses, which will be described later, in close contact with each other.

Moreover, in this step, it is preferable to cut (cut) a predetermined position of the hot water supply copper pipe before performing this step specifically. Specifically, (b) when the construction distance is greater than or equal to a predetermined distance, it is preferable to perform cutting to reduce the distance to less than or equal to the predetermined distance.

Although the specific working distance is not limited, the length for each treatment is preferably in the range of 10 m or more and 40 m or less, and more preferably in the range of 15 m or more and 30 m or less. By setting it as this range, more reliable rehabilitation can be performed.

In addition, although the inner diameter (pipe diameter) of the hot water supply copper pipe targeted by this method is not limited, it is preferably 10 A or more and 30 A or less, more preferably 15 A or more and 20 A or less. be.

Moreover, in this step, the inside of the hot water supply copper pipe is dried as described above. The drying of the hot water supply copper pipe is not limited as long as it can be realized, but it is preferable to use dehumidified compressed air, and the temperature of the compressed air is also preferably equal to or higher than the air temperature (25 ° C. or higher). , preferably 60° C. or less. In addition, it is more preferably about 40°C.

In this step, although not limited, when compressed air is used, the compressed air is supplied in the direction from the faucet side to the water heater side (hereinafter referred to as "normal polishing direction"). Alternatively, the compressed air may be supplied in the direction from the water heater side to the faucet side (hereinafter referred to as "reverse polishing direction"). When sending compressed air from the normal polishing direction, if there is only one piping port on the faucet side, connect it to one, and if there are multiple, connect the compressed air supply pipe (drying hose) to each of them, and connect the piping port on the water heater side. Compressed air is preferably discharged from the Conversely, when sending compressed air from the reverse polishing direction, supply compressed air by connecting a drying hose or the like from the piping port on the water heater side, and if there is one piping port on the faucet side, there are multiple In some cases, it is preferable to discharge compressed air from each of them. An image of this case is shown in FIG .

In addition, the drying time varies depending on the air temperature and the diameter of the pipe, but is not limited as long as the inside of the hot water supply copper pipe can be sufficiently dried, but when the air temperature is about 40 degrees. , 10 minutes or more and 60 minutes or less.

The confirmation of drying in this step is not limited, but a drying hose using a transparent member is connected to the piping port on the side where the compressed air is discharged, and water droplets in this drying hose and confirming that the water droplets have disappeared. This makes it possible to confirm the drying very simply.

In addition, this method has the step of (2) connecting a polishing hose to the hot water supply copper pipe and introducing an abrasive into the inside of the hot water supply copper pipe for polishing. More specifically, polishing hoses are connected to the piping port of the hot water supply copper pipe and the piping port on the water heater side, respectively, and the abrasive is introduced. In this step, by polishing with an abrasive, it is possible to remove stains such as water scale and patina generated inside the pipe.

Silica sand or ceramic sand can be used as the abrasive used in this method, although not limited thereto. Although the size of this polishing sand can be adjusted as appropriate, it is preferably 10 mesh or more and 60 mesh or less.

Further, in the polishing of this method, as described above, polishing hoses are connected to the pipe ports of the hot water supply copper pipe, respectively, the polishing agent is introduced from one pipe port, and the polishing agent is discharged from the other pipe port, It is preferable to carry out by collecting.

By the way, when constructing a hot water supply copper pipe, there are a plurality of pipe ports (faucet ports) as described above (the pipe port is the pipe port on the water heater side), so it is necessary to perform each of them evenly and sufficiently. Therefore, in polishing, after polishing once, it is preferable to polish from the opposite side in the same path. That is, this step has a first step of introducing an abrasive into the inside of the hot water supply copper pipe from one side of the hot water supply copper pipe to polish it, and furthermore, after the first step, the hot water supply copper pipe a second step of introducing an abrasive into the inside of the hot water supply copper pipe from the other side of the pipe for polishing. By doing so, uniform polishing can be performed.

By the way, in the case of a copper pipe for hot water supply, a plurality of branch pipes are connected from the pipe port on the water heater side and the main pipe connected to this water heater. must be polished. For example, if a certain portion is repeatedly polished, the thickness of the pipe at that portion becomes extremely thin, and in severe cases, a hole may be formed in the pipe, so care must be taken.

Therefore, in this step, it is preferable to connect a polishing hose to each of the plurality of piping ports and to polish sequentially in a relay manner. An image of this case is shown in FIG. The example of this figure shows an example in which a pipe port is formed at the tip of each branch pipe, as described above. That is, in this step, the first step of introducing an abrasive into the inside of the hot water supply copper pipe from one side of the hot water supply copper pipe for polishing is to polish the hot water supply copper pipe between two adjacent faucets from one side. It is preferable to polish the inside of the pipe sequentially, and more preferably, after polishing, polish the two furthest pipe ports. In this manner, even a hot water supply copper pipe provided with three or more pipe openings can be uniformly polished.

The example of this drawing will be specifically described. The example in this figure shows an example in which there are M pipe ports on the water heater side and five pipe ports F1 to F5 on the faucet side. Further, F1 is the closest to the water heater side, F2, 3, and 4 are farther away, and F5 is the furthest piping port from the water heater side. In the example of this figure, the first branch DP1 from the main branch MP on the water heater side is connected to the pipe port F1 starting from the branch point J1, and the second branch from the main branch MP on the water heater side. DP2 is connected to the branch point J2 as a starting point and is connected to the pipe port F2, and the third branch DP2 from the main branch MP on the water heater side is connected to the branch point J3 as a starting point and is connected to the pipe port F3, An example is shown in which the third branch DP3 to the fourth branch DP4 are connected from the branch point J4 to the pipe port F4, and the terminal side of the main branch MP is connected to the pipe port F5.

First, the pipe port M on the water heater side is connected to the pipe port F1, and the other pipe ports F2 to F5 are closed with valves or the like. Then, the abrasive is introduced from the pipe port M on the water heater side, discharged from the pipe port F1, and recovered. First, this completes the polishing (first polishing) between M and F1.

Next, the valve of the piping port F2 is opened, the piping port M on the water heater side is closed with a valve or the like, and the abrasive is introduced from the piping port F1 and discharged from the piping port F2 to be recovered. This completes the polishing between F1 and F2 (second polishing).

Further, this time, the valve of the piping port F3 is opened, the exhaust port F1 is closed with a valve or the like, and the abrasive is introduced from the piping port F2 and discharged from the piping port F3 to be recovered. This completes the polishing between F2 and F3 (third polishing).

Next, the valve of the piping port F4 is opened, the exhaust port F2 is closed with a valve or the like, and the abrasive is introduced from the piping port F3 and discharged from the piping port F4 to be recovered. This completes the polishing (fourth polishing) between M3 and F4.

Next, the valve of the piping port F5 is opened, the exhaust port F3 is closed with a valve or the like, and the abrasive is introduced from the piping port F4 and discharged from the piping port F5 to be recovered. This makes it possible to polish the inside of a series of pipes. This completes the polishing between F4 and F5 (fifth polishing).

Finally, it is preferable to grind the farthest pair of pipe ports, here the pipe port M on the water heater side and the pipe port F5 located farthest from this. Also, in this case, it is preferable to put in the abrasive from the piping port F5 at the furthest position, and to discharge and recover the abrasive from the piping port M on the water heater side. This completes the F5-M polishing (sixth polishing).

By the above, uniform and sufficient polishing becomes possible. More specifically, the first polishing completes one normal polishing between M and J1 and one normal polishing between J1 and F1. Next, the second polishing completes one reverse polishing between F1 and J1, one normal polishing between J1 and J2, and one normal polishing between J2 and F2. Next, the third polishing completes one reverse polishing between F2 and J2, one normal polishing between J2 and J3, and one normal polishing between J3 and F3. Next, the fourth polishing completes one reverse polishing between F3 and J4 and one normal polishing between J4 and F4. Next, the fifth polishing completes one reverse polishing between F4 and J4 , one reverse polishing between J4 and J3 , and one normal polishing between J3 and F5. Then, by performing the sixth polishing, reverse polishing between F5 and M, that is, reverse polishing between F5 and J3 once, reverse polishing between J3 and J2 once, and reverse polishing between J2 and J1 is performed once. One reverse polishing between J1-M is performed once. That is, this means that each of the hot water supply copper pipes can be subjected to forward polishing and reverse polishing once. In particular, in the case of copper pipes for hot water supply, there are many branches, and by performing reverse polishing, not only can leakage of polishing be reduced, but some copper pipes for hot water supply are relatively small in diameter. The risk of perforation caused by polishing only multiple times can be greatly reduced. Again, it is preferable to sequentially connect three or more piping ports and perform polishing in a relay manner.

In this step, it is preferable to clean the inside of the tube by air flushing after polishing.

The method also includes the step of (3) introducing paint into the polished copper pipe and coating the inner wall of the copper pipe.

Moreover, in this step, the paint is preferably a two-liquid epoxy resin that is cured by mixing a main agent and a curing agent, although this is not a limitation. In this case, the main material contains bisphenol F type epoxy resin in the range of 70% to 95% by weight, titanium oxide in the range of 2% to 20% by weight, and silica in the range of 0.2% to 10% by weight. The curing agent contains 10% to 60% by weight of modified aliphatic polyamine, 50% by weight of isophorone diamine, 0.2% to 10% by weight of silica, and 0.2% to 10% by weight of phthalocyanine blue. % or less. By setting it in this range, it is possible to perform a sufficiently stable rehabilitation method even for the hot water supply pipe.

Moreover, in this step, the paint preferably contains an antibacterial agent. The antibacterial agent preferably contains fine silver particles or silver ions, more specifically silver zeolite. Further, the mixing ratio of the antibacterial agent to the paint is preferably 0.1 or more and 5 or less, more preferably 1 or more, when the total weight of the main material, curing agent, and antibacterial agent is 100. be. By setting it to 0.1 or more, it is possible to ensure the antibacterial performance, and by setting it to 5 or less, there is an effect that it is possible to prevent the decrease in the hardness of the coating film due to unnecessary addition. .

In this case, it is preferable to immediately decompress the inside of the pipe with a decompression device to remove air bubbles on the surface layer of the coating film after coating.

In addition, in this step, although not limited, (3) a step of introducing paint into the polished copper pipe for hot water supply and applying it to the inner wall of the copper pipe for hot water supply, and (5) the inner wall of the copper pipe for hot water supply. Preferably, between the post-drying steps, there is a step of (6) adjusting the thickness of the paint. This ensures a more uniform paint thickness.

In this step, there is no limitation as long as the thickness of the paint can be made uniform. It is preferable to adjust the coating film surface to be smooth.

In addition, in this step, although not limited, between a plurality of faucets of the copper pipe for hot water supply, from the faucet on one side to the faucet at the closest position Adjust the thickness of the paint in the pipe, then adjust the thickness of the paint in the copper pipe for hot water supply between the faucet at the closest position, and so on, and finally at the farthest position. It is preferable to adjust the thickness of the paint in the hot water supply copper pipe between the faucet. That is, it is preferable to adjust the thickness in the same procedure as the polishing. By doing so, it becomes possible to ensure the uniformity of the thickness of the paint, as in the case of the polishing described above.

In addition, the method has a step of (4) post-drying the inner wall of the hot water supply copper pipe. This allows sufficient drying to cure the paint. In this case, it is also preferable to adjust the temperature so that the paint is sufficiently cured.

In addition, this method has a step of (5) after drying, filling the inside of the hot water supply copper pipe with warm water to cure it with warm water. As a result, it becomes possible to sufficiently remove substances that affect the human body, such as organic substances remaining in the paint. It is especially important to do this at this stage and timing.

In this step, the filling method is not limited as long as the inside of the hot water supply copper pipe can be filled with hot water. Finally, the pipe port M may be closed by closing the respective valves, etc. Alternatively, the hot water is supplied from the pipe port located at the bottom in the vertical direction, and when the hot water is discharged from each pipe port, the pipe ports are closed. You can do it. As a result, hot water curing can be performed while making it difficult for air bubbles to remain in the pipe.

In addition, in this step, hot water curing is preferably performed with hot water having a temperature of 50° C. or more and 90° C. or less, although not limited thereto.

Moreover, in this step, although not limited, the hot water curing is preferably performed for 20 minutes or more and 1 hour or less.

In addition, in this step, hot water curing is preferably performed multiple times, although not limited thereto.

In addition, after hot water curing, the water is passed through, water quality analysis is performed, and water is supplied as drinking water to complete the rehabilitation of the hot water supply copper pipe.

As described above, according to the present embodiment, it is possible to provide a method for rehabilitating hot water supply pipes that does not affect water quality and that can be applied to structures unique to copper pipes for hot water supply.

INDUSTRIAL APPLICABILITY The present invention has industrial applicability as a method for rehabilitating hot water supply pipes.

Claims (7)

pre-drying the inside of the hot water supply copper pipe;
A step of connecting a polishing hose to the hot water supply copper pipe and introducing an abrasive into the inside of the hot water supply copper pipe for polishing;
introducing paint into the polished copper pipe for hot water supply and applying it to the inner wall of the copper pipe for hot water supply;
post-drying the inner wall of the hot water supply copper pipe;
A hot water supply copper pipe rehabilitation method comprising the step of filling the inside of the hot water supply copper pipe with hot water after the drying and curing with warm water,
The hot water supply copper pipe has a plurality of pipe ports connected to a plurality of branch pipes from a main pipe,
The step of connecting a polishing hose to the hot water supply copper pipe and introducing an abrasive into the inside of the hot water supply copper pipe for polishing,
After polishing the inside of the hot water supply copper pipe by introducing the abrasive from the piping opening on one side of the hot water supply copper pipe and discharging the abrasive from the piping opening of the adjacent branch pipe ,
The polishing agent is reversely introduced from the piping port through which the polishing agent has been discharged, and the polishing agent is discharged from the piping port of the other adjacent branch pipe, so that the inside of the hot water supply copper pipe is subjected to normal polishing and reverse polishing. After polishing and repeating this in order to the farthest pipe port from the one side pipe port, conversely,
The polishing agent is introduced from the farthest pipe port to the one pipe port side to uniformly polish the main pipe and the plurality of branches,
The paint is an epoxy resin that is cured by mixing a main agent and a curing agent,
The main agent contains bisphenol F type epoxy resin in the range of 70% to 95% by weight, titanium oxide in the range of 2% to 20% by weight, and silica in the range of 0.2% to 10% by weight,
The curing agent contains 10% to 60% by weight of modified aliphatic polyamine, 50% by weight of isophoronediamine, 0.2% to 10% by weight of silica, and 0.2% to 10% by weight of phthalocyanine blue. A method of rehabilitating copper pipes for hot water supply, including in the range of % or less. 2. The hot water supply copper pipe rehabilitation method according to claim 1, wherein said hot water curing is performed with hot water having a temperature of 50[deg.] C. or higher and 90[deg.] C. or lower. 2. The hot water supply copper pipe rehabilitation method according to claim 1, wherein said hot water curing is performed for a period of 20 minutes or more and 1 hour or less. 2. The hot water supply copper pipe rehabilitation method according to claim 1, wherein said hot water curing is performed a plurality of times. The step of introducing paint into the polished copper pipe for hot water supply and applying it to the inner wall of the copper pipe for hot water supply,
The paint is applied in the hot water supply copper pipe between the faucet on one side and the faucet furthest from the faucet, and then the paint is applied between the next farthest faucet. 2. The hot water supply according to claim 1, wherein the paint is applied to the inside of the hot water supply copper pipe, and this is sequentially applied, and finally, the paint is applied to the inside of the hot water supply copper pipe between the nearest faucet. Copper pipe rehabilitation method. between the step of introducing paint into the polished copper pipe for hot water supply and applying it to the inner wall of the copper pipe for hot water supply and the step of post-drying the inner wall of the copper pipe for hot water supply, adjusting the thickness of the paint. The hot water supply copper pipe rehabilitation method according to claim 1. The step of adjusting the thickness of the paint includes:
Adjusting the thickness of the paint in the hot water supply copper pipe between the faucet on one side and the nearest faucet, Next, the thickness of the paint in the hot water supply copper pipe between the next closest faucet is adjusted, and this is done in sequence, and finally the hot water supply copper between the farthest faucet 7. The method of rehabilitating a copper pipe for hot water supply according to claim 6, wherein the thickness of said paint in the pipe is adjusted.

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