JP2005126804A - Rust prevention device, and method of fitting the rust prevention device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rust prevention device where a linear electrode body can be fitted to a vertical pipe branched from a distributing pipe in a state where water supply is not cut off, and to provide its fitting method. <P>SOLUTION: The rust prevention device is provided with: a guide member 11 fitted to a vertical pipe 3 branched from a distributing pipe 1 via a repair valve 7; a linear electrode body 21 inserted from the guide member 11 to the lower part of the vertical pipe 3 in a watertight state; and a power unit 27 connected to the linear electrode body 21 and performing energizing with the linear electrode body 21 as an anode and the vertical pipe 3 as a cathode. The guide member 11 is cylindrical, and the circumferential side wall thereof is provided with a water stop tool 12. In the linear electrode body 21, an insulating coating is applied to a titanium wire coated with platinum. Many pores are formed on the outer circumferential face in the part contacted with water of the insulating covering material so as to pierce to the radial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rust preventive device for preventing rust from adhering in a vertical pipe of a water distribution pipe, and a mounting method thereof.

The vertical pipe of the water pipe to which a fire hydrant is attached is easy to retain air and easily rusts. Therefore, there is a possibility that the water quality is deteriorated or the water discharge is deteriorated and the fire fighting activity is adversely affected.
It has already been proposed to remove the rust hump (Japanese Patent Application No. 2003-31643), but even if it is removed, the rust hump adheres to the original in a relatively short time, which is a fundamental solution. It does n’t come.

By the way, a water supply pipe for supplying water to each home or condominium is connected to a water distribution pipe from a water purification plant or a water distribution plant via a saddle water tap. And also with respect to this water supply pipe, the adhesion of rust in the water supply pipe is also prevented. As shown in Patent Document 1 below, this is an anticorrosion method and apparatus that inserts a linear electrode body into a water supply pipe, applies a DC voltage to the linear electrode body, and rusts the inside of the water supply pipe.
JP 2000-273665 A

  However, in the past, attention was applied only to the water supply pipe, and it was not applied to the water distribution pipe. This is because the water supply pipe and the distribution pipe are not only different in the jurisdiction of management, but also the pipe diameter and flow rate are different, the installation situation of the linear electrode body is remarkably different, and even if applied as it is, it is effectively rusted. This is thought to be due to the inability to prevent adhesion. Moreover, in order to attach a linear electrode body to a water supply pipe, it was necessary to stop water once. In the case of a water supply pipe, it affects only the inhabitants such as the home or condominium, but if the water supply pipe is cut off, many people will be affected.

  This invention is made | formed in view of the said situation, The main objective is a rust prevention apparatus which can attach a linear electrode body to the vertical pipe of a water distribution pipe with a continuous water, and its attachment method. It is in.

  In order to achieve the above object, the invention according to claim 1 is applicable to a guide member provided between a repair valve and a fire hydrant, wherein the fire hydrant is applied to a vertical pipe of a distribution pipe provided via a repair valve. A metal wire and a covering material that can be insulated, and a linear electrode body that is inserted from the guide member to the lower part of the vertical pipe through a repair valve in a watertight state, and connected to the linear electrode body, A rust preventive device comprising a power supply device that energizes a linear electrode body as an anode and a vertical tube as a cathode.

  The invention according to claim 2 is the rust prevention device according to claim 1, wherein the guide member includes an on-off valve at a position above the insertion portion of the linear electrode body.

  In order to achieve the above object, the invention according to claim 3 is applied to a vertical pipe of a water pipe in which a fire hydrant is provided via a repair valve, and comprises a metal wire that can be energized and a covering material that can be insulated, A linear electrode body inserted in a watertight state from a fire hydrant through a repair valve to the lower portion of the vertical tube, and a power supply device connected to the linear electrode body and energized using the linear electrode body as an anode and the vertical tube as a cathode And a rust preventive device.

  The invention according to claim 4 is the rust prevention device according to claim 3, wherein the fire hydrant is formed with an insertion hole for the linear electrode body at a position below the on-off valve. is there.

Further, in the invention according to claim 5, the linear electrode body from the power supply device is fed in a watertight state via a water stop provided on the guide member or the fire hydrant. The rust preventive device according to any one of claims 1 to 4, wherein the feeding amount of the electrode body can be changed while the linear electrode body can be held.
Furthermore, in the invention according to claim 6, the fire hydrant is a ball-type underground fire hydrant with a built-in air valve housed in a fire hydrant box, the repair valve is a ball-type repair valve, and the power supply device is The rust preventive device according to any one of claims 1 to 5, wherein electric power is supplied from a solar cell provided on a lid of the fire hydrant box.

  In order to achieve the above object, the invention according to claim 7 is a method of providing the rust preventive device according to claim 5 or claim 6 in the vertical pipe of the water distribution pipe with unrestricted water, which is repaired. After closing the valve and attaching the guide member between the repair valve and the fire hydrant, open the repair valve and feed the linear electrode body from the guide member to the vertical pipe, and then with the water stop to the outside from the guide member This is a method for mounting a rust preventive device characterized in that the water stop of the wire is completely completed and the advancement and retreat of the linear electrode body is positioned.

  In order to achieve the above object, the invention according to claim 8 is a method of providing the rust preventive device according to claim 5 or claim 6 on the vertical pipe of the water distribution pipe with constant water, and repairing the apparatus. After closing the valve and using the existing fire hydrant as the fire hydrant according to claim 4, the repair valve is opened, the linear electrode body is fed from the fire hydrant into the vertical pipe, and then the water is stopped from the guide member to the outside. A method for attaching a rust preventive device is characterized in that water is made complete and the advance and retreat of the linear electrode body is positioned.

  According to the rust preventive device and the rust preventive device attaching method of the present invention, the rust preventive device can be attached with unrestricted water, and adhesion of rust on the vertical pipe can be prevented. Therefore, deterioration of water quality can be prevented and fire fighting activities are not hindered.

Hereinafter, the rust preventive device of the present invention will be described in more detail based on examples.
FIG. 1 is a view showing a use state of an embodiment of the rust preventive apparatus of the present invention, and a part thereof is shown in cross section.

  The water distribution pipe 1 from the water purification plant or the water distribution station is provided with a fire hydrant 5 through a vertical pipe 3 made of a metal pipe (steel pipe, cast iron pipe) that branches vertically upward. The fire hydrant 5 is provided at the upper end of the vertical pipe 3 branched from the water distribution pipe 1 via a repair valve 7. The fire hydrant 5 and the repair valve 7 are accommodated in a box 9 buried underground. A water supply pipe is connected and branched to the water distribution pipe 1 via a saddle water faucet, and water is supplied to each household via this water supply pipe.

  The repair valve 7 is a ball-type repair valve in which a spherical valve body is housed in a cylindrical valve box 7a that is open in the vertical direction. The spherical valve body has a through hole formed in the diameter direction. This valve element is rotated by a handle 7b provided in the valve box 7a. The water from the water distribution pipe 1 is supplied to the fire hydrant 5 as the through hole of the valve body is arranged in the vertical direction and communicates with the pipe line of the valve box 7a.

  The rust preventive device of the present embodiment includes a guide member 11 attached to the vertical pipe 3 branched from the water distribution pipe 1 via the repair valve 7, and a linear shape inserted from the guide member 11 to the lower part of the vertical pipe 3 in a watertight state. The main body includes an electrode body 21 and a power supply device 27 that is connected to the linear electrode body 21 and energizes the linear electrode body 21 as an anode and the vertical tube 3 as a cathode.

The guide member 11 attached to the repair valve 7 has a cylindrical shape, and flanges 11a and 11b serving as attachment parts to the fire hydrant 5 and the repair valve 7 are formed at both upper and lower ends. A water stop 12 is provided on the peripheral side wall of the guide member 11.
In addition, the valve | bulb which can be opened and closed may be provided in the upper part of the guide member 11.

FIG. 2 is a cross-sectional view showing an exploded state of the water stop device.
The water stop 12 includes a base 13 that is fixed to the peripheral side wall of the guide member 11, a first stopper 15 that is fitted into the base-end-side recess 13 e of the base 13, and the first stopper 15 via a second stopper 17. A cap 19 that is screwed into the base 13 to be pressed against the base 13 is provided.

  The base body 13 has a cylindrical shape, and a flange portion 13a is formed at the center in the axial direction by expanding the diameter outward in the radial direction. A knurling process is applied to the peripheral side surface of the flange portion 13a. Screws 13b and 13c are respectively formed on the peripheral side surface on the distal end side (left side in FIG. 2) and the proximal end side from the flange portion 13a. The base body 13 is attached in a watertight state with its distal end screw portion 13b screwed into a screw hole formed through the peripheral side wall of the guide member 11.

  The base body 13 is formed with a through hole 13d through which the linear electrode body 21 passes along the central axis. Thereby, the internal space of the guide member 11 and the exterior communicate. The diameter of the through hole 13d is formed to be slightly larger than the outer diameter of the linear electrode body 21, and the linear electrode body 21 is passed through the through hole 13d so as to be able to advance and retreat. The base end portion of the through hole 13d formed in the base 13 is formed with a diameter increasing toward the base end side. Thus, a truncated cone-shaped recess 13e having a diameter decreasing toward the distal end side is formed at the center of the base end surface of the base 13.

  The first stopper 15 has a base end portion 15a formed in a short columnar shape, and a tip end portion 15b formed in a truncated cone shape whose diameter decreases toward the tip end side. This frustoconical tip portion 15 b can be inserted into a recess 13 e formed in the base 13. The first stopper 15 is made of a resin material (PTFE in this embodiment). Further, the first stopper 15 is formed with a through hole 15c through which the linear electrode body 21 passes along the central axis. The through hole 15 c is adapted to the outer diameter of the linear electrode body 21. The base end portion of the through hole 15c formed in the first stopper 15 is formed with a diameter increasing toward the base end side. As a result, a frustoconical recess 15d is formed at the center of the base end surface of the first stopper 15 and the diameter of the first stopper 15 decreases toward the distal end.

  The second stopper 17 has a base end portion 17a formed in a short cylindrical shape, and a tip end portion 17b formed in a truncated cone shape whose diameter decreases toward the tip end side. This frustoconical tip portion 17 b can be fitted into a recess 15 d formed in the first stopper 15. Further, the second stopper 17 is formed with a through hole 17c through which the linear electrode body 21 passes along the central axis. The through hole 17 c is adapted to the outer diameter of the linear electrode body 21.

  The cap 19 has a bottomed cylindrical shape opened to the distal end side (left side in FIG. 2), and a screw 19a is formed on the inner peripheral surface thereof so as to be screwed into the proximal end side screw portion 13c of the base body 13. . The outer peripheral surface is knurled. Further, a concave portion 19 b that can accommodate the short cylindrical base end portion 17 a of the second stopper 17 is formed at the center of the bottom surface of the cap 19. A through hole 19c through which the linear electrode body 21 passes is formed along the axial direction in the center of the bottom surface.

FIG. 3 is a cross-sectional view showing a state in which the waterstop is attached to the guide member.
As shown in FIG. 3, the waterstop 12 having the above-described configuration has a first stopper 15 inserted into a recess 13 e of the base 13 screwed to the guide member 11, and a second stopper 15 d of the first stopper 15 is inserted into the second stopper 15 d. The stopper 17 is fitted. At this time, the outer peripheral surface of the truncated cone-shaped tip portion 15 b of the first stopper 15 abuts on the outer peripheral surface of the recess 13 e of the base 13, and the outer peripheral surface of the truncated cone-shaped tip portion 17 b of the second stopper 17 is the first stopper 15. The concave portion 15d is in contact with the outer peripheral surface. As shown in FIGS. 1 and 3, screw holes formed through the peripheral side wall of the guide member 11 are formed so as to be inclined downward toward the inside of the guide member 11, and the base 13 is screwed obliquely from above. It is preferable to adopt a configuration for mounting.

  And the cap 19 accommodates the 1st stopper 15 and the 2nd stopper 17 in an inside, and is screwed in the base end side screw part 13c of the base | substrate 13. As shown in FIG. When the cap 19 is screwed loosely with respect to the base 13, the linear electrode body 21 can be advanced and retracted. Then, by strongly screwing the cap 19 into the base body 13, the first stopper 15 is pushed into the recess 13 e of the base body 13 and tightens the linear electrode body 21. Thereby, the outer peripheral part of the linear electrode body 21 is completely stopped, and the linear electrode body 21 is positioned.

FIG. 4 is a schematic cross-sectional view of a linear electrode body.
The linear electrode body 21 of the present embodiment is configured such that an insulating coating 23 is applied to a titanium wire 22 coated with platinum. As this insulating material, a fluororesin fiber, preferably a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PFA) can be used. A large number of small holes 23a are formed in the outer peripheral surface of the distal end side (in-tube insertion portion) of the insulating coating material 23 so as to penetrate in the radial direction. The outer diameter of the linear electrode body 21 is about 3 mm, for example, although it depends on the diameter of the vertical pipe 3 of the water distribution pipe 1. In addition, the diameter, pitch, and the like of the small holes 23 a are appropriately set according to the diameter of the vertical pipe 3 of the water distribution pipe 1.

  A DC voltage is applied to the linear electrode body 21, but when the rust preventive device of this embodiment is applied to an underground fire hydrant, it is preferable to attach a solar cell 25 to the lid 9a of the fire hydrant box 9 ( FIG. 1). And the electric power from the solar cell 25 is supplied to the linear electrode body 21 via the power supply device 27. Note that power may be supplied from a primary battery or the like.

Hereinafter, a method for attaching the rust preventive device of this embodiment will be described.
The rust preventive device of this embodiment is applied to the vertical pipe 3 of the water distribution pipe 1 in which the underground fire hydrant 5 is provided via the ball type repair valve 7.
In order to attach the rust prevention device, first, the ball type repair valve 7 is closed, and the fire hydrant 5 is removed from the repair valve 7. And the guide member 11 is mounted in the repair valve 7, and the flanges of both members are attached with a volt | bolt. Moreover, the fire hydrant 5 is mounted on the guide member 11, and both flanges are attached with bolts. At this time, the fire hydrant 5 is closed.

  The water stop 12 is attached to the guide member 11, the linear electrode body 21 is passed through the water stop 12, and the distal end side is inserted into the guide member 11. The length of the tip side of the linear electrode body 21, that is, the portion where the hole 23a is formed in the insulating coating material 23 is adjusted to the distance from the guide member 11 to the lower portion of the vertical tube 3. In order to allow the linear electrode body 21 to advance and retreat, the cap 19 of the water stop 12 is screwed into the base 13 loosely.

  Then, the repair valve 7 is opened, and the linear electrode body 21 is fed into the vertical pipe 3 through the guide member 11 and the repair valve 7. When the linear electrode body 21 reaches the lower part of the vertical tube 3, the cap 19 is strongly screwed into the base 13. As a result, the tip 15b of the first stopper 15 is pressed into the recess 13e of the base 13 and pushed in, and the first stopper 15 tightens the linear electrode body 21. Thereby, the water is completely stopped and the linear electrode body 21 is positioned. Since the dimension of the portion where the hole 23a is formed in the insulating coating material 23 is adjusted, the insulating coating of the linear electrode body 21 led out from the guide member 11 in a state where the linear electrode body 21 is positioned. Holes are not formed in the material 23.

After feeding the linear electrode body 21 into the vertical tube 3, the linear electrode body 21 is connected to the power supply device 27 and a DC voltage is applied to the linear electrode body 21. When direct current is applied with the linear electrode body 21 as an anode and the vertical tube 3 as a cathode, a corrosion-proof current flows from the hole 23 a of the insulating coating material 23 of the linear electrode body 21. Then, the ionization of the vertical tube 3 is stopped, and as a result, rust does not occur.
That is, the metal melts and rusts when electrons are emitted, but the chemical formula of iron corrosion is expressed as “Fe → Fe ²⁺ + 2e ⁻ ”. When the lost electrons are supplied, iron can be maintained in a stable state without melting. That is, by supplying the anticorrosion current from the linear electrode body 21, the vertical tube 3 does not corrode and does not rust.

  By the way, it is preferable that the fire hydrant is a fire hydrant with an air valve in order to eliminate an air reservoir that causes the vertical pipe 3 to rust. For example, it is preferable to use a previously proposed fire hydrant with a built-in air valve (Japanese Patent Laid-Open Nos. 2002-276836 and 2003-126284). Alternatively, as shown in FIG. 5, an air vent valve may be provided on the guide member 11 itself.

FIG. 5 is a view showing a state in which an air vent valve is provided on the guide member.
As shown in this figure, the lower end of the hollow tube 60 is connected to the peripheral side wall of the guide member 11, and the air vent valve body 61 having the same configuration as the air valve of FIG. 6 described later is provided at the upper end of the hollow tube. . As described above, when the air vent valve is attached, when air enters the guide member, the air is discharged outward from the air vent valve body 61 through the hollow tube 60. As a result, air cannot be accumulated in the vertical tube 3 or the guide member 11, and the linear electrode body 21 effectively acts.

  In the said Example, the guide member 11 is arrange | positioned between the repair valve 7 and the fire hydrant 5, and the method of inserting the linear electrode body 21 in the vertical pipe 3 from the water stop 12 provided in the guide member 11 is demonstrated. However, the linear electrode body 21 may be inserted into the vertical pipe 3 from the fire hydrant via the water stop 12 provided on the fire hydrant with the guide member 11 omitted.

FIG. 6 is a cross-sectional view showing a state in which a water stop is provided on the fire hydrant 30.
The underground fire hydrant 30 according to the present embodiment is a ball-type underground fire hydrant with a built-in air valve, and can eliminate the accumulation of air in the vertical pipe.
For example, a previously proposed fire hydrant (Japanese Patent Laid-Open No. 2002-276836) can be used as the ball type underground fire hydrant with a built-in air valve.
The fire hydrant 30 includes a valve box 31, a first valve rod 40, a second valve rod 42, a valve body 44, a housing member 45, a float valve body 47, and a floating valve body 50 as main parts. .

The valve box 31 is formed with a lower opening 31A on the water supply side and an upper opening 31B of the drain side branch pipe 33, and a valve lid 37 is provided on the upper part facing the lower opening 31A.
Specifically, the valve box 31 includes a substantially cylindrical main body 32 that opens in the vertical direction, and a bend-shaped branch pipe that branches upward in a 90-degree arc shape from the peripheral side surface of the main body 32 and opens upward. The path 33 is integrally formed. The main body part 32 is slightly reduced in diameter from the connection part with the branch pipe line 33 to form an inflow pipe line 34. A flange 35 is formed at the lower end of the inflow conduit 34.

The first valve rod 40 has a cylindrical shape, and is provided so as to be rotatable with respect to the valve lid 37 and not movable up and down.
The second valve rod 42 has a cylindrical shape, is screwed to the first valve rod 40 so as to be able to advance and retreat, and is provided so as to be unable to rotate and move up and down relative to the valve lid 37.
The valve body (packing) 44 is provided on the outer periphery of the tip of the second valve rod 42, and opens and closes communication from the lower opening 31A of the valve box 31 to the upper opening 31B as the second valve rod 42 moves up and down. .

  The housing member 45 has a substantially cylindrical shape opened upward and is provided in the first valve rod 40. The lower surface of the housing member 45 is formed to bulge downward in a substantially spherical shape. The accommodation member 45 is formed with communication holes 46A, 46B, and 46C that communicate the inside and outside of the accommodation member 45 on the side surface and the lower end surface, respectively. In the illustrated example, a communication hole 46C is formed at the center of the lower surface of the housing member 45, and a plurality of communication holes 46A and 46B are formed on the side surface of the housing member 45 so as to be separated in two rows. Has been. Note that the side communication holes 46A and 46B are formed on the side surfaces that are the upper and lower positions of the floating valve body 50, which will be described later, in the state where it is lowered most.

  The float valve body 47 has a substantially spherical shape and is accommodated in the accommodation member 45. And it can be moved up and down according to the amount of water in the housing member 45 by floating in water.

  The floating valve body 50 has a substantially disk shape that is slightly smaller in diameter than the inner diameter of the housing member 45, and is housed in the housing member 45 in a state of being disposed above the float valve body 47. The floating valve body 50 can move up and down along with the float valve body 47, and an exhaust hole 51 for exhausting the air that has entered the housing member 45 outward is formed through the center portion in the vertical direction. ing. The exhaust hole 51 can be opened and closed by a float valve body 47. In addition, the floating valve body 50 is capable of exhausting air outwardly through the communication hole 46 </ b> A by descending below the communication hole 46 </ b> A in the upper side surface of the housing member 45.

  A float presser 53 that prevents the floating valve body 50 from falling off the housing member 45 is provided on the top of the housing member 45. An exhaust hole 54 for exhausting air from the floating valve body 50 or the housing member 45 outward is formed at the center of the float retainer 53.

  In the valve box 31, a through hole 32 a that communicates the inside and the outside is formed in the peripheral side wall of the inflow conduit 34. The through hole 32a in the illustrated example is formed to be inclined downward as it goes into the valve box 31. And the water stop 12 of the structure similar to the said Example is screwed in and provided in this through-hole 32a.

  When inserting the linear electrode body 21 from the fire hydrant 30 having such a configuration, first, the fire hydrant 30 and the repair valve 7 are closed, the linear electrode body 21 is passed through the water stop 12, and the fire hydrant 30 is inserted. Insert the tip side inside. At this time, in order to allow the linear electrode body 21 to advance and retract, the cap 19 of the water stop 12 is loosely screwed into the base.

  Then, the repair valve 7 is opened, and the linear electrode body 21 is fed into the vertical tube 3. When the linear electrode body 21 reaches the lower part of the vertical tube, the cap 19 is screwed strongly into the base 13 to stop and position the water. In addition, since the hole 32a through which the linear electrode body 21 passes is formed to be inclined downward, the linear electrode body 21 is easily fed.

  By the way, in the initial state, when a fire hydrant without the water stop 12 is disposed above the repair valve 7, the repair valve 7 is closed and the fire hydrant is replaced with a fire hydrant with a water stop. . Or what is necessary is just to process the valve box of an existing fire hydrant, and just to attach the water stop tool 12. FIG. Then, as described above, the linear electrode body 21 may be inserted into the vertical tube 3.

The rust preventive apparatus of the present embodiment can use the fire hydrant as usual even when attached to the vertical pipe, and thus does not hinder fire fighting activities.
Moreover, the rust preventive device of the present embodiment can be attached with unrestricted water, and does not cause inconvenience to residents and the like.

By the way, in order to use the rust preventive apparatus of the present invention more effectively, it is preferable to remove the rust humps already attached in the vertical pipe and then attach them. In order to remove rust humps in the vertical pipe, a previously proposed rust hump removing device (Japanese Patent Application No. 2003-31643) can be used. This device can be used by being attached to a ball type repair valve.
If the butterfly type repair valve is attached to the upper end of the vertical pipe instead of the ball type repair valve. If this rust hump removal device cannot be used, the previously proposed valve body removal device ( The butterfly repair valve may be changed to a ball repair valve using Japanese Patent Application No. 2003-31643).

It is a figure which shows the use condition of one Example of the rust prevention apparatus of this invention, and has shown it by making a part into a cross section. It is sectional drawing which shows the decomposition | disassembly state of the water stop tool of the rust prevention apparatus of FIG. It is sectional drawing which shows the attachment state to the guide member of the water stop tool of the rust prevention apparatus of FIG. It is a schematic sectional drawing of the linear electrode body of the rust prevention apparatus of FIG. It is a figure which shows the state which provided the air vent valve in the guide member. It is sectional drawing which shows the state by which the water stop was provided in the fire valve with a built-in air valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water distribution pipe 3 Vertical pipe 5 Fire hydrant 7 Repair valve 9 Box 11 Guide member 12 Water stop 13 Base 15 First stopper 17 Second stopper 19 Cap 21 Linear electrode body 22 Platinum-coated titanium wire 23 Insulation coating material 23a Small hole 25 Solar cell 27 Power supply 30 Air valve built-in fire hydrant 31 Valve box 32a Through hole

Claims (8)

Fire hydrant is applied to the vertical pipe of the distribution pipe provided through the repair valve,
A guide member provided between the repair valve and the fire hydrant;
It consists of a metal wire that can be energized and a covering material that can be insulated, and a linear electrode body that is inserted from the guide member to the lower part of the vertical tube through the repair valve in a watertight state,
And a power supply device connected to the linear electrode body and energized with the linear electrode body as an anode and a vertical tube as a cathode.   The rust prevention apparatus according to claim 1, wherein the guide member includes an on-off valve at a position above the insertion portion of the linear electrode body. Fire hydrant is applied to the vertical pipe of the distribution pipe provided through the repair valve,
It consists of a metal wire that can be energized and a coating material that can be insulated, and a linear electrode body that is inserted in a watertight state from the fire hydrant through the repair valve to the lower part of the vertical pipe,
And a power supply device connected to the linear electrode body and energized with the linear electrode body as an anode and a vertical tube as a cathode. The anticorrosion device according to claim 3, wherein an insertion hole for the linear electrode body is formed in the fire hydrant at a position below the opening / closing valve. The linear electrode body from the power supply device is sent in a watertight state through a water stop provided on the guide member or the fire hydrant,
The rust preventive device according to any one of claims 1 to 4, wherein the water stop device is capable of changing a feeding amount of the linear electrode body, and is capable of holding the linear electrode body. apparatus. The fire hydrant is a ball type underground fire hydrant with a built-in air valve housed in a fire hydrant box,
The repair valve is a ball-type repair valve,
The rust preventive device according to any one of claims 1 to 5, wherein the power supply device is supplied with electric power from a solar cell provided on a lid of a fire hydrant box. A method of providing the rust preventive device according to claim 5 or 6 in a vertical pipe of a water distribution pipe with continuous water,
After closing the repair valve and installing a guide member between the repair valve and the fire hydrant,
Open the repair valve, send the linear electrode body from the guide member to the vertical pipe,
Then, with the water stop, the water stop from the guide member to the outside is completed, and the advancement / retraction of the linear electrode body is positioned. A method of providing the rust preventive device according to claim 5 or 6 in a vertical pipe of a water distribution pipe with continuous water,
After closing the repair valve and using the existing fire hydrant as the fire hydrant according to claim 4,
Open the repair valve, send the linear electrode body from the fire hydrant to the vertical pipe,
Then, with the water stop, the water stop from the guide member to the outside is completed, and the advancement / retraction of the linear electrode body is positioned.

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