JP6989739B2 - How to install a strainer for removing foreign substances in tap water and how to install water pipes - Google Patents

Description

The present invention relates to a method of installing a strainer for removing foreign substances in tap water and a method of constructing water pipes.

Conventionally, various works such as repair or replacement of water pipes have been carried out due to system replacement or deterioration of water operation for maintenance of water pipes, but such water works have been carried out. Water will be cut off for several hours to several days, and water will be passed again after the construction is completed. However, when water is passed, foreign matter such as rust, sand, and a sealing material in the pipe may flow in the water pipe, and colored water or turbid water may be discharged from the water faucet. In order to avoid such a situation, usually, after the construction is completed and before the water flow, a considerable amount of water is discharged as washing water at a predetermined part for a long time until the colored water or the turbid water disappears. Then, the pipe washing work is performed to wash away foreign substances in the pipe. However, in reality, it is difficult to completely prevent the supply of colored or muddy water to ordinary households and stores, and the user is forced to stop using the water supply for a long period of time. The current situation is that.

Under such circumstances, it is strongly required not only for general households but also for food manufacturers using water as a raw material to promptly supply clean water after water outage and water flow due to waterworks. There is.
This application has been made to solve the above-mentioned problems, and is a method of installing a strainer for removing foreign substances in tap water and water pipes, which enables removal of fine foreign substances after water outage and water flow due to water works. The purpose is to provide the construction method of.

The present application provides the following inventions.
(1) A bottomed tubular screen and a strainer for removing foreign matter from tap water having a flange located at one end of the screen are adjacent to a water meter housed in a housing whose part is exposed on the ground surface. A method of installing a strainer for removing foreign matter from tap water, which comprises installing the water pipe in a water pipe connected to the water meter.
(2) The method for installing a strainer according to the above description, wherein the screen has a two-layer structure consisting of an outer network and an inner network.
(3) The method for installing a strainer according to the above description, wherein the opening diameter in the inner network is smaller than the opening diameter in the outer network.
(4) The method for installing a strainer according to the above description, wherein the collar portion is sandwiched between the water meter and the water pipe, and the strainer is installed so that the screen is housed in the water pipe.
(5) The method for installing the strainer according to the above description, wherein the strainer is installed on the downstream side of the water meter.
(6) After the water supply is cut off due to the waterworks, the strainer installation method described above is executed.
After the waterworks are completed, tap water is passed through the strainer.
A method for constructing water pipes, including removing the strainer 1 day to 1 week after water flow.

According to the method of installing a strainer for removing foreign substances in tap water and the method of constructing water pipes of the present disclosure, it is possible to remove fine foreign substances after water outage and water flow due to water supply work.

It is schematic cross-sectional view which shows an example of the strainer used in the installation method of the strainer for removing foreign matter of tap water of this application. It is schematic cross-sectional view which shows another example of the strainer used in the installation method of the strainer for removing foreign matter of tap water of this application. It is a schematic schematic diagram of a water pipe or the like for explaining the installation method of the strainer for removing foreign substances of tap water of this application. It is an enlarged view near the water meter in FIG. 2A. It is an enlarged view of the water supply pipe which shows the installation part of the strainer in FIG. 2B.

[How to install the strainer]
In the present disclosure, the method of installing a strainer for removing foreign substances in tap water (hereinafter, may be simply referred to as "strainer") is to install a specific strainer in a water pipe connected to a water meter adjacent to the water meter. Including the process of
The strainer used in the method of installing the strainer of the present disclosure can remove foreign substances that cause turbid water generated in waterworks, and does not obstruct the flow rate and flow velocity of water in water pipes while supplying water. In order to attach / detach before / after waterworks, those that satisfy all of the requirements of being installed in a part that can be attached / detached easily, easily, and in a short time can be mentioned. Here, the water pipe refers to all water pipes including straight pipes, flexible pipes, universal joints for meters, and the like. In addition, water works include water pipe replacement work, water replacement work, valve replacement work, and system maintenance work by opening and closing valves. Easy attachment / detachment means that it can be installed and removed in water pipes without digging up the ground or destroying the walls or floors of the building.
As a result, it is possible to easily and easily realize the reduction of the amount of water for washing the pipes and the shortening of the time for water cuts due to the water cutoff and the water flow of the conventional pipe work, and it is possible to greatly improve the work efficiency.

For example, as shown in FIGS. 1A and 1B, the strainers 10A and 10B include bottomed cylindrical screens 1 and 11 and flanges 2 and 12 arranged at one ends 1a and 11a of the screens 1 and 11. The one is preferable. With such a configuration, it can be fixed in a predetermined position in the water pipe, withstands the water pressure applied for the supply of tap water, and removes foreign substances without obstructing the passage of water. It can be executed reliably.

Various materials can be mentioned as the material constituting the strainer. For example, in the case of metals, iron, copper, aluminum and the like are generally used, but duralumin, stainless steel, brass and the like are used as alloys. Examples of plastics include general-purpose plastics, general-purpose engineering plastics, and super-engineering plastics as thermoplastic resins. Examples of general-purpose plastics include polypropylene, polyethylene, polyvinyl chloride, polyvinylidene chloride, ethylene vinyl acetate copolymer resin, polymethylmethacrylate, styrene butadiene acrylonitrile copolymer resin, and polystyrene. Examples of general-purpose engineering plastics include polyacetal, polyamide, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, modified polyphenylene ether, ultra-high molecular weight polyethylene, syndiotactic polystyrene, and alloy resins thereof. Examples of the super empla include tetramethylpentene, polyetheretherketone, acrylate polyarylate, liquid crystal polymer, polysulfone, polyethersulfone, polyphenylene sulfide, polyimide, polyetherimide, aromatic nylon resin, fluororesin and the like. Examples of the thermosetting resin include phenol resin, urea resin, melamine resin, epoxy resin, unsaturated polyester resin, silicon resin, polyurethane resin and the like. Examples of natural materials include cotton and linen. Examples of the sintered body include ceramics and the like, and metal sintered bodies and the like.

In the strainer, all the constituent members such as the screen, the flange portion, the reinforcing member, and the cap may be made of the same material, or may be made of different materials. For example, two or more metals, two or more plastics, and in some cases both metal and plastic materials may be used. These can be selected in consideration of an excellent combination in terms of strainer manufacturing cost and durability. For example, the screen 1 of the strainer of FIG. 1A may be made of metal, and the flange portion 2, the reinforcing member 3 and the cap 4 may be made of plastic.

The bottomed cylindrical screens 1 and 11 are preferably those that extend straight in the water flow direction, and the cross-sectional shape perpendicular to the water flow direction is preferably circular or substantially circular, for example. The size of the cross section preferably has, for example, an outer diameter D slightly smaller than the inner diameter of the water pipe to be installed. For example, 30 mm or less is mentioned, and 25 mm or less, 22.5 mm or less, 19 mm or less, or 13 mm or less is preferable. As shown in FIG. 1A, the cylinder of the screen 1 may have a constant diameter in the extension direction, or as shown in FIG. 1B, a cylinder whose diameter varies from one end 11a to the other end 11b, for example. , The diameter may be expanded or reduced. The variation in this case includes a variation in diameter of about 10 to 20% in the total length. The total length L of the tubular strainers 1 and 11a is preferably as long as possible for installation, installation, and removal in the water pipe. For example, 200 mm or less is mentioned, and 100 mm or less is preferable. In other words, those having a filtration area of 2000 mm ² or more are mentioned, and those having a filtration area of 2200 mm ² or more are preferable. The upper limit is 5000 mm ² or less.

The screens 1 and 11 may have a single-layer structure or may have a multi-layer structure of two or more layers. Of these, a two-layer structure is preferable. The multi-layer structure makes it possible to easily adjust the balance between the filtration capacity and the water flow capacity while ensuring the strength of the screen. The size of the screen opening can be appropriately adjusted by a single-layer or multi-layer laminated structure, but it must be large enough to remove foreign substances expected to be generated in waterworks and not to hinder the flow rate and flow velocity. is necessary. For example, 10 to 1000 meshes can be mentioned. In the case of a multi-layer structure, it is preferable that the opening of the inner screen is small and the opening of the outer screen is large. By setting the size of such an opening, it is possible to more easily balance the filtration capacity and the water flow capacity. For example, the inner screen opening is 100 to 1000 mesh and the outer screen opening is 10 to 200 mesh, the inner screen opening is 200 to 1000 mesh, and the outer screen opening is 20 to 100 mesh. ..

For example, when a wire-like or fibrous material such as SUS is used, the wire diameter thereof may be 1 μm to 1 mm, preferably 10 to 500 μm, and 20 to 300 μm in order to obtain the above-mentioned opening. The one is more preferable. By using such a material, it is possible to remove the strainer, wash it, and reuse it.

The flanges 2 and 12 arranged at the ends 1a and 11a of the bottomed tubular screens 1 and 11 are larger than the outer shape of the cylinders of the screens 1 and 11 and project vertically or substantially vertically in the water flow direction. The flange portions 2 and 12 may be arranged on all or a part of the outer periphery of one ends 1a and 11a of the cylinder, and by arranging the flange portions 2 and 12 on the entire outer circumference, the strength of the tubular screens 1 and 11 is further increased. It can be secured and the deformation of the cylindrical screens 1 and 11 can be prevented. It also contributes to firmly fixing it at a desired position in the water pipe. The diameter Dx of the flange portions 2 and 12 can be appropriately adjusted according to the diameter of the water pipe in which the strainers 1 and 11 are installed, and is preferably larger than the inner diameter of the water pipe to be installed and further larger than the outer diameter. .. Further, 40 mm or less is mentioned, and 35 mm, 30 mm or 23 mm is preferable. The thickness T of the flange portion may be, for example, 0.5 mm or more, preferably 1 mm or more. The upper limit of the thickness is 3 mm or less. Examples of the material constituting the flange portion include the same materials as those constituting the screen, and among them, it is preferable to form the collar portion with the same material as the screen. This is for ease of manufacture.

Reinforcing members 3 and 13 along the outer peripheral or inner circumference of the cylinder of the screen 1 are attached to the flanges 2 and 12 in order to reinforce the connecting portion between the flanges 2 and 12 and the screens 1 and 11. May be good. The length Lx of the reinforcing members 3 and 13 is, for example, several mm to 10 mm, and is preferably 3 to 8 mm. By providing the reinforcing members 3 and 13, it is possible to maintain the filtration capacity and the water flow capacity by minimizing the blockage of the mesh or the deformation of the screen while realizing the addition of an appropriate strength.
The bottomed tubular screens 1 and 11 may be bottomed by arranging parts such as caps 4 and 14 at the other ends 1b and 11b different from the one ends 1a and 11a where the flanges 2 and 12 are arranged. However, the other end of the screen may be folded to form a bottom. Among them, from the viewpoint of pressure resistance, it is preferable to arrange parts such as a cap to make the bottom.

The strainer in the present disclosure can be manufactured by a method known in the art or in combination of these methods. When the member constituting the strainer is a metal, as a metal processing method, a method of forging, pressing, powder metallurgy, welding, casting, or in some cases, molding using an adhesive by utilizing the characteristics of the metal. And so on. In the case of plastic, a method of creating a mold that imitates a molded product or a part of a molded product and injection molding, a method of bonding the parts of the molded product with an adhesive, etc., by heat fusion Examples include a method of joining. As described above, when the filter portion of the strainer of FIG. 1A is made of metal and the flange and the cap portion are made of plastic, they may be integrally molded by, for example, injection molding.

The strainer in the present disclosure preferably has predetermined characteristics in, for example, a foreign matter (iron rust, etc.) tolerance test (flow rate test), a pressure resistance test, a leaching test, and the like. Specifically, when a strainer is installed in the water pipe connected to the water meter actually installed and water is passed under normal water pressure, the flow rate is compared with the flow rate when the strainer is not installed. The fluctuation is preferably within 7%, more preferably within 5%. In other words, the one within 3 L / min is preferable, and the one within 2 L / min is more preferable. Further, it is preferable that the fluctuation of the flow rate when 1.0 g of iron powder (particle size: 0.1 to 1 mm) is added from the middle of the water pipe and supplemented with a strainer is within 45%, preferably within 40%. Is more preferable. When 2.0 g of iron powder (particle size: 0.1 to 1 mm) is added from the middle of the water pipe and supplemented with a strainer, the fluctuation of the flow rate is preferably 50% or less, preferably 45% or less. The one is more preferable. Further, even when the strainer is loaded with a water pressure of 1.75 MPa for 1 minute, it is preferable that the strainer can withstand the water pressure without being deformed. In addition, those that pass the leaching test according to JWWA (Japan Water Works Association) Z 108: 2004 are preferable.
By providing such characteristics, as described above, foreign substances that cause turbid water generated in waterworks can be removed, and the flow rate and flow velocity of water in water pipes are not hindered, and conventional pipe works are performed. It is possible to easily and easily realize the reduction of the amount of water for washing pipes and the shortening of the water cutoff time due to the water cutoff and the water flow, and it is possible to greatly improve the work efficiency.

In the method of installing the strainer of the present application, the above-mentioned strainer is detachably installed in the water pipe connected to the water meter adjacent to the water meter.
For example, as shown in FIGS. 2A, 2B and 2C, the water meter 20 is usually housed in the housing 22 together with the auxiliary faucet 21. A part of the housing, for example, the lid 23, is exposed on the ground surface in order to enable periodic reading of the water meter. As a result, the water meter 20 and the auxiliary faucet 21 can be easily touched without digging up the ground and destroying the walls or floor of the building. Further, water is supplied between the water meter 20 and the auxiliary water stop 21, on the upstream side of the auxiliary water stop 21 and on the downstream side of the water meter 20, via joints 24a, 24b, 24c, 24d, etc. such as universal joints, respectively. The universal joints 25a and 25c are connected. Therefore, the joints 24a, 24b, 24c, 24d, etc. can be easily removed, and the water pipe universal joints 25a, 25c can be easily connected or disconnected. As a result, the strainer 10 can be easily and quickly installed in the water pipe universal joint 25c connected to the water meter 20 adjacent to the water meter 20, and can be easily and quickly removed at any time.

The water meter may be any conventional water meter. For example, it may be a JWWA standard water meter or a JIS B 8570-2: 2013 standard water meter. Water meters are provided with inlets and spouts on the upstream side (water distribution pipe side of the Waterworks Bureau) and the downstream side (water supply equipment (faucet, etc.) side of general houses, apartments, etc.), and the strainer is this. As long as it is adjacent to the water meter, it may be installed on either the inlet side (in FIG. 2B, the joint 24b side) or the spout side (in FIG. 2B, the joint 24c side). Above all, it is preferable to install it on the downstream side (in FIG. 2B, the joint 24c side). The strainer may be in contact with or separated from the water meter as long as it is installed in the water pipe (including various fittings) connected to the water meter (ie, inlet or spout). .. For example, it is preferable to install the water meter so that its flange is sandwiched between the end face of the inlet or outlet of the water meter and the joint connected to the water pipe, and the water directly discharged from the water meter is the water meter. It is more preferable that the strainer is installed so that the water injected into the water meter or the water discharged from the water meter enters the strainer directly. In particular, since the strainer is liquid-tightly installed in the water pipe so that the water poured out from the water meter directly enters the strainer, the strainer can be applied in a manner that makes it easy to secure water resistance. Further water resistance can be ensured. In addition, foreign matter to be removed can be reliably captured in the strainer. In other words, the strainer is preferably installed on the downstream side of the water meter.

[Construction method of water pipe]
In the construction method of the water supply pipe, as shown in FIG. 2A, usually, the water supply is cut off before the water supply work at the water supply tool 30 including the water stop valve 30a on the residential land side H or the upstream side R of the water supply pipe 31. Will be done. Then, when the water is cut off, new water pipe 40 is introduced or old water pipe is replaced, new water pipe installation / renewal work, cleaning work to wash the inner surface of the water pipe to remove iron rust, etc., from the water pipe or water pipe. Various works such as water leak repair work to repair water leaks and installation work of water pipes to newly install or add water pipes will be carried out.
After the water outage, in parallel with or before and after the water supply work, as described above, the strainer 10 is installed adjacent to the water meter 20 in the water pipe universal joint 25c.
After the installation of the strainer and various works are completed, tap water is passed through the strainer. By installing the strainer in this way, the cleaning process of the pipe can be simplified. As a result, the amount of water used for cleaning the pipes can be significantly reduced, and the time required for the cleaning, that is, the water cutoff time can be significantly shortened. Further, even if foreign matter caused by the construction work is mixed in the tap water after the completion of various works, the strainer can surely remove the foreign matter without obstructing the water flow.

In the method of constructing water pipes in the present application, it is one of the important steps to remove the strainer one day to one week after the water flow. In other words, once the plumbing work is completed and the water flow is once performed, the water supply is not normally cut off unless the water supply work is performed again, but the water flow after the water supply work is completed 1 day to 1 day. After a week, the water is temporarily stopped for a few minutes to a dozen minutes, during which the strainer is removed from the water pipe. By removing the strainer in this way, it is possible to reliably avoid the temporary contamination of foreign matter due to the water supply work, and to supply clean water promptly after the completion of the water supply work. In addition, even if foreign matter accumulates in the strainer, the strainer itself is quickly removed together with the foreign matter after 1 day to 1 week, so it is possible to avoid obstruction of the flow rate and flow velocity in the water pipe. Become.
Temporary water stoppage when removing the strainer is, for example, as shown in FIGS. 2A and 2C, an auxiliary water stopcock which is usually housed together with a water meter 20 in a housing 22 whose part is exposed on the ground surface. It can be carried out by 21 or by a water stopcock 30a which is located upstream of the housing 22 and whose operation can be easily performed from the ground surface, as shown in FIG. 2C. By using the equipment in the housing 22 exposed on the ground surface or the water stop valve 30a, it is possible to easily and quickly perform water stoppage and removal of the strainer for removing the strainer. The effect can be exerted extremely advantageously.

なお、流水試験は、図２Ａ及び２Ｂで模式的に示したのと同様、一般の一連の配水管から給水管において、通常通水されている水圧（０．５ＭＰａ）での流量を測定した。
また、耐水試験では、１．７５ＭＰａで１分間の水圧を負荷して、ストレーナの変形を目視により観察した。
浸出試験はＪＷＷＡ（日本水道協会）Ｚ １０８：２００４ｍｐ７．２部品試験又は材料試験に従って試験を行い、合格とした。 The method of installing the strainer of the present application will be described in detail below.
In the water meter 20 shown in FIGS. 2A and 2B, three types of water injection / outlet diameters of 13 mm, 20 mm, and 25 mm are prepared, and auxiliary water stopcocks 21, joints 24a to 24d, and universal water pipe joints 25a, 25c are provided. Prepared together with the housing 22. In addition, a strainer of a size corresponding to each water meter was prepared, and each strainer was installed in the water pipe connected to the water meter adjacent to the water meter.
After that, water was passed through the strainer, and a flow rate test, a pressure resistance test, and an leaching test were performed when the strainer was installed.
The strainers and various test results used in these tests are shown in Table 1 below.

In the running water test, the flow rate at the water pressure (0.5 MPa) normally passed from the general series of water distribution pipes to the water supply pipe was measured in the same manner as schematically shown in FIGS. 2A and 2B.
In the water resistance test, a water pressure of 1.75 MPa was applied for 1 minute, and the deformation of the strainer was visually observed.
The leaching test was conducted according to JWWA (Japan Water Works Association) Z 108: 2004mp7.2 parts test or material test, and passed.

According to the method of installing a strainer for removing foreign substances in tap water and the method of constructing water pipes of the present application, it is possible to omit the conventional water cutoff and cleaning steps associated with water flow, and remove fine foreign substances in tap water. It was confirmed that the above can be easily and easily realized, the amount of water for washing pipes can be reduced, the water cutoff time can be shortened, and the work efficiency can be significantly improved.

In the strainer installation method described above, the plastic strainers D to F shown in Table 2 below can be used instead of the strainers A to C.

1, 11: Screens 1a, 11a: One end 1b, 11b: The other end 2, 12: Collar 3, 13: Reinforcing member 4, 14: Cap 10A, 10B: Strainer 20: Water meter 21: Auxiliary faucet 22 : Housing 23: Lid bodies 24a, 24b, 24c, 24d: Joints 25a, 25c: Water pipe universal joint 30: Water supply tool 30a: Water stopcock 31: Water supply pipe 40: Water distribution pipe H: Residential land side R: Upstream side L : Total length of strainer T: Thickness of fitting D: Diameter of screen Dx: Diameter of fitting Lx: Length of reinforcing member

Claims (4)

A bottomed tubular screen that is closed or has a screen-like hole, a flange located at one end of the screen, a reinforcing member that reinforces the connection between the flange and the screen, and the opposite side of the end. A strainer for removing foreign matter from tap water, which is provided with a cap located at the other end of the water meter, is adjacent to a water meter housed in a housing whose part is exposed on the ground surface, and is located at the inlet or spout of the water meter. A strainer for removing foreign matter from tap water, including detachably installing it in a water pipe connected to the water meter so as to sandwich the flange between an end face and a joint connected to the water pipe. Installation method. A bottomed tubular screen that is closed or has a screen-like hole, a flange located at one end of the screen, a reinforcing member that reinforces the connection between the flange and the screen, and the opposite side of the end. A water pipe for removing foreign matter from tap water, which has a cap located at the other end of the water pipe, is connected to the water meter adjacent to the water meter housed in a housing whose part is exposed on the ground surface. Including detachable installation inside
The screen has a two-layer structure composed of an outer network and an inner network, and is a method for installing a strainer for removing foreign substances in tap water having an inner network of 200 to 500 mesh and an outer network of 20 to 100 mesh. The method for installing a strainer according to claim 1 or 2, wherein the strainer is installed on the downstream side of the water meter. After the water supply is cut off due to waterworks
A bottomed tubular screen that is closed or has a screen-like hole, a flange located at one end of the screen, a reinforcing member that reinforces the connection between the flange and the screen, and the opposite side of the end. A strainer for removing foreign matter from tap water having a cap arranged at the other end of the water meter is connected to the water meter adjacent to the downstream side of the water meter housed in a housing whose part is exposed on the ground surface. Install it in the water pipe or execute the method of installing the strainer according to any one of claims 1 to 3.
After the waterworks are completed, tap water is passed through the strainer.
A method for constructing water pipes, including removing the strainer after 1 day to 1 week of water flow.

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