JP4719696B2 - Elution prevention method and elution prevention device for lead component in lead pipe in residential area - Google Patents

Description

  The present invention prevents the elution of lead components that may be eluted into the water at the lead pipe portion of the water pipe when supplying the water to each consumer, and is mainly installed for each consumer. The existing bent lead pipe connected before and after the water meter (water meter) can be dealt with without replacement, and elution in the lead pipe part can be easily prevented. The present invention relates to an elution prevention method and an elution prevention apparatus.

  Conventionally, many local governments such as municipalities have installed water supply facilities for supplying water to each area. This water supply facility is constructed by branching from the distribution pipes installed in the supply area so that the water supply pipes are drawn into the premises for each customer, and through the on-off valves and water meters installed in the premises. We contact the water taps of each customer.

  From the water distribution pipe to the water supply faucet, the water distribution pipe is deeply buried in the ground, and the water supply faucet is installed on the ground, for example, in the customer's building, so the installation position gradually increases between them High, that is, close to the ground surface. In addition, lead pipe materials that are easy to bend are used before and after each water supply device buried in the ground and at pipe connection points in consideration of the installation installation environment and conditions.

  However, if there is a temporary stagnation of clean water at the site where the lead pipe material is used, the lead component may elute into the clean water even in a slight amount from the lead pipe material. There is a need to consider when supplying clean water. That is, when lead is accumulated in the human body, gastrointestinal disorders, limb tremors, numbness, etc. may occur, and it is required to improve the elution phenomenon of lead components into the water. Therefore, the Ministry of Health, Labor and Welfare has decided to raise the “lead water quality standard” for lead pipes used in water supply equipment from 0.05 mg to 0.01 mg per liter since 2003.

On the other hand, the water meter installed in the water supply pipe in the customer's site is installed near the ground in the installation box because of the necessity of meter reading of the water meter. Therefore, before and after the water meter, it is connected from the buried depth position of the water supply pipe to a predetermined height position via a bent lead pipe so as to reach the position of the installation box installed near the ground. Yes. Therefore, it is currently requested to improve the lead pipe used for connection in this way.
nothing special

  However, this lead pipe improvement is to replace the lead pipe material buried in the ground with a non-lead pipe material made of, for example, stainless steel, and exchanging work is necessary for the exchange of the pipe material of which these materials are different. Even if this excavation work can be done at the discretion within the management scope of the manager, etc., replacement of lead pipes connected before and after the water meter installed in the premises (residential land) of general consumers Since the cost is borne by the consumer, the current situation is that the consumer is forced to lose weight even if the necessity is recognized. In addition, when the water meter is installed in a residential land, for example, there are many cases such as concrete pavement in a parking lot, tiled for makeup, lawn vegetation, and the like. Then, even though the restoration of the original state after the excavation is not completely restored, the appearance will deteriorate, so considering these, even if there is public subsidy for improvement work, it will be due to cloth replacement work from customers The subsidy application itself has decreased, and the lead pipe has not been improved.

  Specifically, as shown in FIG. 3, the area where the lead pipes are exchanged is the area that is replaced by the administrator as the “lead pipe improvement promotion project scope” on the road side, and the “subsidy system scope” on the residential land side. "Is the range to be exchanged at the consumer. Thus, the installation location of the water meter is in the customer's premises, and the lead component elution prevention measures for the lead pipes connected before and after the water meter are the result of the customer's judgment. Yes.

  Therefore, the present invention was created in view of the conventional circumstances as described above, and the purpose thereof is, for example, of the lead component in the bent lead pipe portion connected before and after the water meter in the residential land. It is to prevent elution into drinking water. For this reason, an inner cladding tube that prevents direct contact between the inner surface of the lead pipe and the supplied water is forcibly inserted into the existing lead pipe. This eliminates the need for excavation work to replace the existing lead pipe itself, makes the construction easy and can be done in a short period of time, and is extremely cheap compared to the cost of excavation work. An object of the present invention is to provide a lead component elution prevention method and an elution prevention device for lead pipes in residential land that can supply and provide safe drinking water without causing it to flow out to the supply destination.

In order to solve the above-described problems, in the present invention related to the method for preventing the elution of lead components in residential land lead pipes, the lead components in the lead pipe P portion existing in the buried existing water supply pipe S are introduced into the water. For preventing elution, forcibly inserting a flexible inner cladding tube 1 having a blocking property of a lead component having an outer diameter smaller than the inner diameter of the lead tube P into the lead tube P. The inner cladding tube 1 can be, for example, a polybutene tube.
At the opening end of the inner cladding tube 1, waterproof packing 6A, 6B is interposed at a connection portion with each water supply device connected to the lead pipe P, such as a water meter M or a pipe material constituting the water supply pipe S, such as the water supply tube T. The insertion core 3 with the flange portion 4 connected to the end of the inner cladding tube 1 can be disposed.
Then, together with the flange portion 4 corresponding to the opening diameter of the lead pipe P and the waterproof packing 6A interposed between the front face of the flange portion 4 and the end opening face of the inner cladding tube 1, the lead pipe P is connected to each of the water supply devices (M ) Or a nut (N) to the pipe material (T) .
Moreover, in this invention which concerns on an elution prevention apparatus, each water supply connected to the inner cladding pipe 1 forcedly inserted in the lead pipe P part which exists in the existing existing water supply pipe line S, and the lead pipe P An insertion core 3 with a flange portion 4 connected to an opening end of the inner cladding tube 1 at a connection site with a pipe material such as a water meter M or a water supply pipe S, for example, a water supply pipe T, and the insertion core 3 A waterproof packing 6A, 6B disposed on the front and rear surfaces of the flange portion 4; and a nut N for fastening and connecting the lead pipe P to each of the water supply devices (M) or the pipe material (T). The waterproof packing 6A corresponds to the opening diameter of the lead pipe P.
Further, an insertion guide end 2 having a substantially sharp shape can be formed on the insertion end side of the inner cladding tube 1.
The insertion core 3 is cylindrical, and an insertion taper surface 5 that gradually becomes smaller in diameter as it reaches the opening end can be formed on the opening end side.

In the lead component elution prevention method and the elution prevention device in the residential lead pipe according to the present invention configured as described above, the inner cladding tube 1 is inserted into the lead tube P portion, so that the lead tube P The lead component that may be eluted does not bleed into the inner cladding tube 1 and is supplied to the customer's supply destination without changing the clean water supplied from the supply source.
The insertion guide end 2 on the insertion distal end side of the inner cladding tube 1 allows the inner cladding tube 1 itself to be smoothly inserted into the lead tube P along the bent shape of the lead tube P from the open side of the opened lead tube P. The inner cladding tube 1 inserted into the inner surface of the lead pipe P blocks lead components that may be eluted from the lead pipe P.
By connecting the lead pipe P to each water supply device or the pipe material constituting the water supply line S in a state where the inner cladding tube 1 connected to the insertion core 3 with the flange portion 4 is inserted into the lead pipe P, the waterproof packing 6A, 6B Combined with the interposition, the end face of the insertion core 3 is sealed, and water is not allowed to flow out due to the dropper principle.

  Since the present invention is configured as described above, the inner cladding tube 1 is inserted into the lead pipe P portion existing in the water supply pipe S, so that it is connected before and after the water meter M in the residential land, for example. It is possible to prevent elution of the lead component into the upper water in the bent lead pipe P portion. That is, direct contact between the inner surface of the lead pipe P and the supplied water can be cut off by inserting the inner cladding tube 1 that is forcibly inserted into the existing lead pipe P, thereby preventing the elution of lead components into the water. It can be done. Therefore, since it can be constructed only with the opening part of the open lead pipe P, the excavation work for exchanging the existing lead pipe P itself is unnecessary, the construction can be performed easily and in a short time, and it is extremely cheap compared with the cost of the excavation work. It only costs money. Moreover, for example, even when stagnant water is generated over a long period of time, it is possible to supply and supply safe water without causing it to flow out to the supply destination.

  That is, in the present invention, this is forcibly inserted into the lead pipe P existing in the water supply pipe S from the opening portion of the lead pipe P in which the flexible inner cladding pipe 1 having a blocking property of the lead component is opened. This is because the lead pipe P is not required to be replaced by non-open cutting, the construction is easy, the construction cost is reduced, the stay water is not discharged, and the like.

  Further, at the opening end of the inner cladding tube 1, a flange portion 4 interposed at a connection portion with each water supply device connected to the lead pipe P, for example, the water meter M or the pipe material constituting the water supply pipe S, for example, the water supply tube T. Since the insertion core 3 is provided, the inner cladding tube 1 is inserted into the lead pipe P, so that it is compatible with the waterproof packings 6A and 6B disposed on the flange portion 4 of the insertion core 3, and almost completely at the connection site. Further, the end face of the flange portion 4 is sealed, and the staying water does not flow out to the outside by the principle of the dropper.

  By making the inner cladding tube 1 a polybutene tube used for supplying tap water, it is possible to ensure safety as supplied water. Further, since the insertion guide end 2 having a substantially sharp shape is formed on the insertion end side of the inner cladding tube 1, for example, the insertion is smoothly performed when inserting into the lead tube P bent according to the piping condition or the like. be able to.

  Since the insertion taper surface 5 which becomes gradually smaller in diameter as it reaches the opening end is formed at the opening end of the cylindrical insertion core 3, each of the inner cladding tubes 1 prepared corresponding to the length of the lead tube P is provided. On the other hand, even at the construction site, the insertion core 3 can be easily and reliably connected to the prepared inner cladding tube 1.

  In addition, the code | symbol attached | subjected in each means of the means for solving said subject and the effect of invention was attached | subjected in order to make easy reference with the part which shows each structure part described in drawing. The present invention is not limited to these descriptions, structures, shapes, and the like indicated by reference numerals and the like in the drawings.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Reference numeral 1 shown in the figure is an internal cladding tube that is forcibly inserted and disposed in a lead pipe P in a water supply pipe S that is laid to supply each customer with the water supplied from the management provider. . The inner cladding tube 1 has an outer diameter that is not larger than the inner diameter of the lead pipe P and is flexible so as to be inserted along the bent shape of the lead pipe P, and the lead component eluted from the lead pipe P. For example, polybutene pipes (JIS k6792 and k6778) standardized for water supply. Of course, the inner cladding tube 1 is not limited to this material as long as it has such flexibility and barrier properties, and is made of another synthetic resin material that does not elute or deposit harmful components, and further, a metal material. It may be a tube material.

  The inner cladding 1 has an inner diameter of 13 mm for a general water supply pipe S for ordinary consumers or the like, or has an inner diameter of 20 mm or 25 mm for a large capacity water supply pipe S for a large customer or the like. In such a case, consideration is given to corresponding to each lead pipe P. For example, when the lead pipe P diameter is 13 mm, the outer diameter of the inner cladding tube 1 is 10.0 mm, the inner diameter is 8.0 mm, and when the inner diameter is 20 mm, the outer diameter of the inner cladding tube 1 is 15.2 mm and the inner diameter is 11. The outer diameter of the inner cladding tube 1 in the case of 8 mm and 25 mm is about 17.0 mm and the inner diameter is about 12.8 mm. Of course, it is not limited to these. Further, the inner cladding tube 1 is inserted inside the lead pipe P so as to desirably adhere to the inner surface of the lead pipe P.

  In the figure, R is a water distribution pipe in the water supply facility, T is a water supply pipe, B is an on-off valve, M is a water meter (water meter), C is a water tap, and the lead pipe P targeted in the present invention is a quantity A lead pipe P connected to the front and rear of the water device M is mainly used.

  The inner cladding tube 1 itself is forcibly inserted from the open end of the opened lead tube P when the meter device M is separated from the lead tube P and removed, for example, in accordance with the replacement time of the meter device M. Since the end of the lead pipe P is connected to the indoor pipe connected to the water tap C of the customer, the inner cladding pipe 1 is inserted into the lead pipe P up to the connection site. At the time of construction, the internal length of the lead pipe P to be inserted is appropriately measured in advance, and the internal cladding tube 1 having a length corresponding thereto is prepared and inserted. At the time of insertion, the tip of the inner cladding tube 1 is set as an insertion guide end 2 that is sharpened by cutting obliquely as shown.

  An insertion core 3 is connected to a distal end portion of the inner cladding tube 1 opposite to the insertion guide end 2. The insertion core 3 has a cylindrical shape having a flange portion 4 that is larger in diameter than the outer diameter of the inner cladding tube 1, and can be easily removed from the end portion of the inner cladding tube 1 at the cylindrical portion. It is connected by forcibly inserting so that there is no. Therefore, the insertion taper surface 5 is formed in the cylindrical portion of the insertion core 3 so that the outer diameter gradually becomes smaller as it reaches the insertion side opening end. This insertion core 3 is formed by, for example, a bronze alloy that has been subjected to a surface treatment to prevent leaching of a lead component, or a cutting product of a lead-less bronze alloy.

  The outer diameter of the flange portion 4 is set so as not to hinder the screwing by the connection nut N for connecting and fixing the water meter M and the lead pipe P. The inner diameter of the connection nut N with respect to the water meter M, for example, the water meter M This corresponds to the outlet diameter of the lead pipe or the opening diameter of the lead pipe P.

  Further, waterproof packings 6 </ b> A and 6 </ b> B are interposed on the front and rear surfaces of the flange portion 4 in the insertion core 3. The waterproof packing 6A disposed on the front surface of the flange portion 4 on the lead pipe P side is formed to be slightly thinner than the waterproof packing 6B disposed on the rear surface of the flange portion 4 on the water meter M side. It is interposed between the tube 1 end opening surface.

  In addition, when both ends of the lead pipe P are opened, the insertion core 3 may be attached to both end opening portions of the inner cladding tube 1 inserted into the lead pipe P together with the waterproof packings 6A and 6B.

  Next, an example of the use of this will be described. In the lead pipe P part in the water supply pipe S, for example, in the lead pipe P connected before and after the water meter M installed in the so-called residential land in the customer, the lead component from the lead pipe P part is eluted into the water. When this is prevented, the inner cladding tube 1 is forcibly inserted into the lead tube P. For example, when the water meter M is removed from the lead pipe P connected to the front and back of the water meter M at the time of replacement of the water meter M (this replacement is made every eight years, for example), it was opened. The inner cladding tube 1 is forcibly inserted from the open end of the lead tube P. At this time, after appropriately measuring the length inside the lead pipe P, the length corresponding to the length is set, and the inner covering pipe 1 to which the insertion core 3 and the waterproof packing 6A are attached is prepared, and the insertion guide end which is the tip thereof It is forcibly inserted into the lead pipe P sequentially from the second side. After the insertion, the waterproof pipe 6B is interposed on the rear surface of the flange portion 4, and the lead pipe P and the water meter M are fastened with a connection nut N to be connected.

  Even when the inner cladding tube 1 was inserted into the lead pipe P, no decrease in the amount of water supply was particularly observed as a result of supplying clean water at a predetermined conventional supply pressure. Moreover, although the insertion into the lead pipe P of the inner cladding tube 1 was demonstrated as the replacement time of the water meter M, of course, it is not limited to this.

It is a partially omitted exploded perspective view showing the best mode for carrying out the present invention. It is a partially cutaway side view. It is the schematic of a water supply pipe line similarly.

Explanation of symbols

B ... Open / close valve C ... Water faucet M ... Water meter N ... Connection nut P ... Lead pipe R ... Water distribution pipe S ... Water supply pipe T ... Water supply pipe 1 ... Inner cladding pipe 2 ... Insertion guide end 3 ... Insertion core 4 ... Flange Part 5 ... Insertion taper surface 6A, 6B ... Waterproof packing

Claims (4)

A buried existing elution prevention method of a lead component in land the lead pipe to prevent the dissolution of the upper water lead content in lead pipe portion present water supply conduit during, the internal plumbing, small diameter compared to the lead pipe inner diameter A flexible polybutene-made inner cladding tube with an outer diameter of a lead component is forcibly inserted, and at the open end of the inner cladding tube, each water supply device or water pipe connected to the lead tube A waterproof packing interposed at the connection site with the pipe material constituting the road, an insertion core with a flange connected to the end of the inner cladding tube, and a flange corresponding to the opening diameter of the lead pipe, and this flange A lead packing method for preventing lead components from leaking in lead pipes in residential land, wherein the lead pipe is connected to each water supply device or pipe with a waterproof packing interposed between the front opening of the inner cladding tube and the end surface of the inner cladding tube. . So that is forcibly inserted into buried in plumbing portion present water supply conduit in the existing, and inner cladding having an outer diameter of the small diameter compared to the plumbing inside diameter, each water supply device or the feed water pipe connected to the lead pipes An insertion core with a flange portion connected to the opening end of the inner cladding tube at the connection portion with the pipe constituting the road, a waterproof packing disposed on the front and rear surfaces of the flange portion of the insertion core, and a lead pipe for each water supply A device for preventing elution of lead components in lead pipes in residential land, comprising nuts to be connected to nuts to equipment or pipes, and having flanges and waterproof packings corresponding to the opening diameters of lead pipes. The apparatus for preventing elution of lead components in a residential lead pipe according to claim 2 , wherein a substantially sharp insertion guide end is formed on the insertion end side of the inner cladding tube. 4. The lead component elution prevention device for lead pipes in residential land according to claim 2, wherein the insertion core is cylindrical, and an insertion taper surface that gradually decreases in diameter toward the opening end is formed on the opening end side.

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