JP2002241975A - Method and device for mounting anode for electrolytic protection of water pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anode installation means in water pipe electrolytic protection which does not require suspension of water supply. SOLUTION: At the anode insertion mounting part of a water pipe 16, an electrode installation saddle 21 of a clamp 20 which has a standing short cylinder 19 having a tapered inner screw 17 for electrode installation and an outer screw 18 for attachment installation on the central top is jointed and fixed while holding a packing 22 for sealing on the lower part corresponding to the short cylindrical part 19. A hole is opened on a main pipe 16 for water disposal, and then, at the bored hole, a rod-shaped anode 40 is inserted from the above into a plug 39 which consists of an insulating material provided with a tapered outer screw 18 mating the tapered inner screw 17 of the short cylindrical part 19 of the saddle for electrode installation. An angular nut 41 for wrench biting is fixed on the top plate of the plug 39. At a screw hole 42 opened at the center of the angular nut 41, an electrode body 38 formed by drawing the conducting wire extending from the anode is fixed by screwing into the screw 17 in the short cylindrical part 19 of the saddle 21 for electrode installation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for mounting an anode electrode in cathodic protection of a water pipe (cathodic protection method).

[0002]

2. Description of the Related Art As a means for preventing rust in a water pipe, there is an electrolytic protection method. One of the methods is to apply a corrosion protection current from an anode electrode inserted into the metal pipe with the body to be protected (metal pipe) as a negative electrode. 2. Description of the Related Art Corrosion prevention (cathodic protection method) is known in which a potential difference on a metal surface which causes corrosion is reduced, and the potential of the metal is reduced to an inactive state (the anode electrode is connected to an anode of an external power supply, and the corrosion protection is performed). The body's metal tubing is connected to the cathode of an external power supply to form a circuit through tap water).

[0003] To attach the above-mentioned anode electrode to the metal pipe, the metal pipe is cut, and then a flange is fixedly attached to each of both ends of the metal pipe, which is a cut portion, by screwing or welding. It is performed by fastening a flange type anode electrode (a short tube having a flange at both ends and an anode electrode attached to the anode electrode) between the pair of flanges with a bolt. From the cumbersome initial means that requires a lot of work, such as forming a strip and assembling and fixing the flange to the metal pipe by screwing or welding, directly to the metal pipe without cutting (flange pipe connection) Applicants have proposed a proposal to insert and mount (without instrumentation) the patent 279078.
I did it in No. 7.

[0004] That is, as shown in FIGS. 12 a and 12 b (a is a process in which the electrode is being mounted and b is a time when the mounting is completed), the anode electrode 1 is provided with a small diameter thread 7 around which the lock nut 3 is screwed. And a lower member 6 having a large diameter and a lower member 6 having a large diameter. The clamp 2 made of an insulating material has a large-diameter upper assembly portion 8 whose lower end surface is in contact with the outer peripheral surface of the metal wall K;
And a lower assembling portion 9 having a small diameter and penetrating into an assembling hole formed in the metal wall K. On the upper part, a saw-tooth-shaped lock piece 11 with which the screw 7 of the anode electrode 1 is locked so as not to come out is protruded. First, the anode electrode 1 and the clamp 2 are assembled into the through hole 10 of the clamp 2.
The upper member 5 of the anode electrode 1 is inserted from below. By this insertion, the upper member 5 of the anode electrode 1 is engaged with the lock piece 11 protruding from the through hole 10, and the anode electrode 1 is assembled to the clamp 2 so as not to come out (not fall). In this state, the assembly of the anode electrode 1 and the clamp 2 is not firm, but is an unstable assembly in which the screw 7 and the lock piece 11 only engage.

[0005] Between the lower member 6 of the anode electrode 1 and the lower assembled portion 9 of the clamp 2, between the upper member 5 of the clamp 2 and the outer peripheral surface of the metal wall K, and between the lock nut 3 and the upper end surface of the clamp 2. Between the seal packings 14a, 14b, 1
4c is provided (FIG. 7A).

In order to attach the lock nut 3 and the anode electrode 1, a jig (not shown) is used to mount the lock nut 3 and the anode electrode 1 upward, as shown in FIG.

As a result, the thread 7 of the anode electrode 1 further passes over the lock piece 11 of the clamp 2 and the anode electrode 1
After the lower member 6 of the anode electrode 1 exerts an upward lifting force on the lower assembling portion 9 of the clamp 2 after the assembling between the lower electrode 6 and the clamp 2 is deeply achieved, the lower assembling is performed by this lifting force. The swellable portion 15 of the portion 9 which is formed of an easily deformable material swells and deforms outward, and comes into contact with the inner peripheral surface of the metal wall K so that it cannot be pulled out of the mounting hole (riveting). .

At the upper end of the anode electrode 1, a cap terminal 4 having a pilot lamp 13 which is turned on when the anode electrode 1 is energized is assembled.

[0009]

The means for inserting and mounting the anode electrode into the metal pipe (water pipe) described above is a large-sized one that allows the insertion of a large-diameter anode electrode covered with an insulator into the metal pipe. A bore must be drilled. Since the pipe is in use, water cutoff is required.

[0010] At present, there is no means capable of inserting and mounting the anode electrode without the need for cutting off the water.

In addition, the clamp 2 is attached to the large hole described above with the edge of the hole sandwiched between the holes. However, such a force is applied to an aging pipe, a thin pipe, or a low-quality pipe. In such a case, the tube wall may be collapsed, and fixing of the anode may fail.

As a matter of course, dealing with such a failure is extremely difficult.

However, it is difficult to reliably detect a part that does not fail, and it is not guaranteed that corrosion protection as designed will be achieved.

Furthermore, in the case of a pipe of such imperfect quality, the perforation of a large-diameter hole is disadvantageous in terms of the sectional loss of the pipe.

The present invention has been made in view of the circumstances described above, and has as its object the purpose of requiring only a small perforation, without applying any external force to the small perforation, and supplying water without the need to cut off water. An object of the present invention is to provide a means for directly inserting and attaching an anode electrode to a metal pipe (water pipe) by a cathodic protection method which can be performed while continuing.

[0016]

Means for Solving the Problems To achieve the above object, the method for attaching an anode electrode in water pipe cathodic protection according to the present invention comprises the steps of:
A tapered inner screw for attaching the electrode and an external screw for attaching the attachment are mounted on the center top, and a short cylinder part with an engraved electrode is installed.An electrode mounting saddle of a clamp is set up. Then, the lower end of the perforated guide valve provided with a ball valve and having a passage connected to a lateral drain valve by rapidly turning the ball valve is attached to the external thread of the short cylindrical portion. Attach, and further connect a pressure-resistant seal tube for evacuating lifting equipment to the upper end of the perforated guide valve, and magnetize the tip of the through-hole to the pressure-resistant seal tube top plate in advance with the ball valve and drain valve open. A drilling step of lowering a shaft of a drilling tool having a core drill shank to drill a pipe wall of the core drill shank; Adsorption and recovery of cutting chips by the magnetic force of the core drill shank pulled up to the upper rank, drainage of cleaning water through the drain valve for blown-up tap water, and removal of the pressure-resistant seal pipe after closing of the ball valve and the drain valve A core drill shank lifting step of removing from the short cylinder part, and a rod-shaped anode electrode is dripped on a plug made of an insulating material provided with a tapered external thread corresponding to the tapered internal thread of the short cylinder part of the electrode mounting saddle. An electrode body formed by burying a wrench-engaging square nut on the plug top plate and drawing a conduction line from the anode electrode through a screw hole formed in the center of the square nut, is mounted on the plug body top plate. As in the case of the shank, the wrench for the square nut previously attached to the pressure-resistant seal tube is held, and then the pressure-resistant seal tube is assembled to the perforated guide valve, the ball valve is opened, and the electrode body is lowered. Then, the electrode body is fastened to the screw inside the short tube portion of the saddle for mounting the electrode via the wrench, and then the wrench is separated from the electrode body and pulled up to a position higher than the ball valve, and the ball is removed. And removing the perforated guide valve from the short cylinder after the valve and the drain valve are closed.

The anode electrode mounting apparatus for cathodic protection of a water pipe according to the present invention is characterized in that a rod-shaped anode is attached to a plug made of an insulating material provided with a tapered external thread corresponding to a tapered internal thread of a short tubular portion of an electrode attaching saddle. An electrode in which an electrode is embedded in a hanging manner, a wrench biting nut is fixedly mounted on the plug top plate, and a lead wire is drawn from the anode electrode through a screw hole formed in the center of the nut. Body and a tapered internal screw for attaching an electrode and an external screw for attaching an attachment at the top of the center. A clamp for holding and fixing the ball, and a perforated guide valve having a ball valve, and a perforated guide valve which is fastened to the external valve of the short cylinder portion and has a passage communicating with a side drain valve by quickly turning the ball valve. A piercing tool having a shaft having a core drill shank at its tip attached to and detachable from the upper end of the piercing guide valve, and a corner attached to the piercing guide tube; And a nut wrench.

[0018]

In the drilling without cutting off the water, chips are immediately adsorbed to the core drill shank in the spouting water and the water leakage is continuously released through the drain valve, so that chips are not mixed into the water pipe.

The perforation is not for mounting a large-diameter electrode held by an insulating material, but for inserting only an electrode (an insulator on an electrode mounting base is attached to a saddle of a clamp). Therefore, the impact on the deteriorated pipe with a small diameter is much smaller than that of the conventional pipe, and even in the case of the deteriorated pipe, failure is hardly possible.

Further, replacement in case of failure or failure of the electrode is easy (the electrode body needs to be replaced).

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
It will be described based on.

FIG. 1 is an explanatory view of a drilling procedure according to the present invention.

First, a tapered inner screw 17 for attaching an electrode and an outer screw 1 for attaching an attachment are provided at the center of the water pipe 16 at the anode electrode insertion attachment site.
An electrode mounting saddle 21 of a clamp 20 having an upright short tube portion 19 with an engraved 8 is fastened and attached while holding a sealing packing 22 on the lower surface of a portion corresponding to the short tube portion 19.
The holding of the packing 22 is performed by bonding or fitting the recess into the saddle 2.
It is made by shaping on 1. Failure due to unacceptable seals.

By the sealing of the packing 22, the saddle 21 can serve as an electrode mounting base as described later.

The above-mentioned clamp 20 is fastened via bolts 23 as shown in detail in FIG.

Next, a ball valve 26 is provided for the external thread 18 of the short cylindrical portion 19 and the ball valve 26 is provided.
, The lower end of a perforated guide valve 29 having a passage 28 connected to the drain valve 27 on the side is attached, and a pressure-resistant seal pipe 30 for evacuating the lifting equipment described below is connected to the upper end of the perforated guide valve 29. . The pressure-resistant seal tube 30
Is equipped with a piercing tool 50 having a core drill shank 24 magnetized in advance at the tip. The shaft 25 of the core drill shank 24 attached to the pressure-resistant seal tube 30 and the top plate 31 is opened to open the ball valve 26. Then, the handle 32 is rotated and the handle 32 is rotated to make a hole in the wall of the tube 16. At the time of perforation, the drain valve 27 is also opened to flow cleaning water.

In the figure, reference numerals 33 and 34 denote the perforated guide valve 2.
9, a packing interposed when the pressure-resistant seal tube 30 is attached is shown.

The perforated guide valve 29 is shown in detail in FIG.

The connection between the short cylinder portion 19 and the pressure-resistant seal tube 30 is made via cap nuts 35 and 36 provided in advance.

FIG. 4 shows a state in which all the components are joined.
When the drilling is completed, the core drill shank 24 is pulled up as shown in FIG.

That is, the core drill shank 24 is lifted up to a position higher than the ball valve 26 by the magnetic force of the core drill shank 24 to attract and collect cutting chips and to drain the cleaning tap water through the drain valve 27. With this, the drilling is accomplished without the chip falling into the water pipe 16.

After the perforation has been completed, the pressure-resistant seal tube 3 after the ball valve 26 and the water drain valve 27 are closed is closed.
0 is removed from the short tube portion 19.

As shown in FIG. 6, a wrench 37 for a square nut is mounted on another pressure-resistant seal tube 30 in advance.

The wrench 37 is provided with the anode electrode body 3 of the present invention.
8 is held so as to withstand blow-up water (for example, magnetic adhesion with wrench 37 magnetization).

As shown in detail in FIG. 7, the anode electrode body 38 has a tapered outer thread 18 which matches the tapered inner thread 17 of the short cylindrical portion 19 of the electrode mounting saddle 21.
A rod-shaped anode electrode 40 is attached to a plug 39 made of an insulating material provided with
And a wrench biting nut 41 is fixedly mounted on the top plate of the plug 39, and a conduction wire 43 led from the anode electrode 40 through a screw hole 42 drilled at the center of the nut 41.
Is subtracted. An insulator seal 12 is wound around the base of the anode electrode 40 in order to prevent a current flow to the water pipe 16. The square nut wrench 37 is shown in detail in FIG.

In FIGS. 6 and 8, the electrode body 38 of the wrench 37 is held by a screw rod 44 for preventing falling off by using the screw hole 42 described above.

That is, the screw rod 44 inside the wrench 37 is screwed into the screw hole 42 via the driver 51, and the electrode body 38 is connected to the wrench 37. It is intended to be a child.

As shown in FIG. 6, the square nut wrench 3 previously mounted on the pressure-resistant seal tube 30 in the same manner as the piercing tool 50 is used.
7, the pressure-resistant seal tube 30 is held.
The ball valve 26 is opened, the electrode body 38 is lowered, and the plug 39 of the electrode body 38 is connected to the electrode body 38 through the wrench 37 as shown in FIG. The saddle 21 is fastened to the screw 17 inside the short tube portion 19. Thereafter, the wrench 37 is separated from the electrode body 38 (screwed off via the driver 51) and pulled up.
The perforated guide valve 29 and the like attached to the short tube portion 19 are removed. Next, a current controller 46 is mounted in the screw hole 42.

FIG. 10 shows an embodiment in which a cover 45 is covered on the electrode body 38.

This is a screw connection using the outer screw 18.

The correlation between the cover 45 and the current controller 46 is shown in detail in FIG.

That is, the connection from the current controller 46 to the connector 47 of the cover 45 is made,
7 is supplied with power from the control unit.

On the other hand, the connection on the cathode side is processed by cutting into the external screw 18 of the electrode body 38 (not shown).

Incidentally, reference numeral 48 in FIG.
It can be seen from the confirmation window 49 of the cover 45 that this is turned on and the current is flowing.

[0045]

As described above, the present invention has the following advantages. 1. It is safe and very simple because the pipe is inserted and fixed in the deteriorated pipe. 2. Replacement of a defective or defective electrode is easy and inexpensive. 3. No water interruption and no equipment stoppage due to electrode installation. 4. The work of curing and protective equipment at the time of mounting can be reduced. 5. At the time of mounting, there are few tools, materials, etc., and expenses and labor costs are very low.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a drilling procedure according to the present invention.

FIG. 2 is an explanatory view of a clamp according to the present invention.

FIG. 3 is an explanatory view of a perforated guide valve according to the present invention.

FIG. 4 is an explanatory view of the connection of each member introduced in FIG. 1;

FIG. 5 is an explanatory drawing of lifting a core drill shank in FIG. 4;

FIG. 6 is an explanatory view of a procedure for attaching an electrode body after perforation according to the present invention.

FIG. 7 is a detailed view of the electrode body of the present invention.

FIG. 8 is an explanatory view of a wrench for assembling an electrode body according to the present invention.

FIG. 9 is a diagram illustrating the completion of the present invention with an electrode body.

FIG. 10 is an explanatory view of mounting the cover after FIG. 9;

FIG. 11 is an explanatory view of an electrode cover of the present invention.

FIG. 12 is an explanatory view of a conventional electrode attachment procedure.

[Explanation of symbols]

 Reference Signs List 1; anode electrode 2; clamp 3; lock nut 4; cap terminal 5; upper member 6; lower member 7; screw thread 8; upper assembly portion 9; Body seal 13; pilot lamps 14a, 14b, 14c; seal packing 15; swellable portion 16; water pipe 17; inner screw 18; outer screw 19; short tube portion 20; clamp 21; saddle 22; packing 23; bolt 24 Core drill shank 25; Shaft 26; Ball valve 27; Drain valve 28; Passage 29; Guide valve 30; Pressure-resistant seal tube 31; Top plate 32; 38; anode electrode body 39; plug body 40; anode electrode 41; square nut 4 ; Screw hole 43; conducting line 44; captive screws rod 45; a cover 46; a current controller 47; connector 48; emission Daioto 49; confirmation window 50; piercer 51; driver K; metal wall

Claims (5)

[Claims] At first, a short tube portion having a tapered inner screw for attaching an electrode and an outer screw for attaching an attachment is provided at a central top portion of a water pipe at an anode electrode insertion attaching portion, and an electrode is attached to an upright clamp. The saddle is fastened by holding the sealing gasket on the lower surface of the portion corresponding to the short cylinder portion, and then a ball valve is provided for the external thread of the short cylinder portion, and the ball valve is quickly turned. Attach the lower end of the perforated guide valve having a passage connected to the drain valve, and further connect a pressure-resistant seal pipe for retracting lifting equipment to the upper end of the perforated guide valve, and open the ball valve and the drain valve. Then, the shaft of the drilling tool having the core drill shank magnetized at the tip of the through-hole is previously lowered through the pressure-resistant seal tube top plate, and the pipe wall of the core drill shank is drilled. Drilling step, suction and collection of cutting chips by magnetic force of the core drill shank for lifting the core drill shank to a position higher than the ball valve, and draining of cleaning water through the drain valve for blowing up tap water; A core drill shank lifting step of removing the pressure-resistant seal tube from the short tube portion after closing of the drain valve;
A rod-shaped anode electrode is embedded in a plug body made of an insulating material provided with a tapered external thread corresponding to the tapered internal thread of the short cylindrical portion of the electrode mounting saddle, and a wrench is placed on the plug top plate. An electrode body having a biting square nut fixed and a conductive wire drawn from the anode electrode drawn through a screw hole formed in the center of the square nut is mounted on a pressure-resistant seal tube in advance similarly to the core drill shank. After attaching the pressure-resistant seal tube to the perforated guide valve, holding the ball valve open, lowering the electrode body, lowering the electrode body through the wrench, and connecting the electrode body to the short cylinder of the electrode mounting saddle. Then, the wrench is separated from the electrode body and pulled up to a position higher than the ball valve, and the short tube portion of the perforated guide valve after the ball valve and the drain valve are closed. More The anode electrode mounting method in water pipe cathodic protection comprising a disconnect of the electrode body attaching step. 2. A method of holding and separating an electrode body and a wrench for a square nut by screwing a screw hole formed in the center of the square nut of the electrode body with a drop-prevention screw rod inside a feed shaft of the wrench for the square nut. 2. The method for attaching an anode electrode in water pipe electrolytic protection according to claim 1, wherein the method is carried out by screwing and unscrewing through a water pipe. 3. A rod-shaped anode electrode is buried in a plug body made of an insulating material provided with a tapered external thread corresponding to a tapered internal thread of a short cylindrical portion of an electrode mounting saddle, wherein the rod-shaped anode electrode is hung down. A square nut for wrench biting is fixed on the top plate, an electrode body formed by drawing a conductive wire from the anode electrode through a screw hole of a hole in the center of the square nut, and a tapered shape for attaching an electrode to the top of the center. A clamp that holds and seals a seal packing on the lower surface of the portion corresponding to the short tube portion having an electrode mounting saddle with an upright short tube portion engraved with an inner screw and an outer screw for attachment attachment; A perforated guide valve which is provided with a ball valve and which is fastened to the outer thread of the short cylindrical portion and has a passage communicating with a side drain valve; and a detachable pressure resistant upper end of the perforated guide valve. sticker An anode electrode mounting device for water pipe electrolytic protection comprising a pipe, a piercing tool having a magnetized core drill shank at the tip mounted on the pressure-resistant seal pipe, and a wrench for a square nut also mounted on the pressure-resistant seal pipe. 4. The anode in a water pipe electrolytic protection according to claim 3, wherein the wrench for the square nut is provided with a drop-out prevention screw rod screwed into a screw hole formed in the center of the square nut of the electrode body on the payout shaft. Electrode mounting device. 5. The electrode body cover according to claim 3, wherein the cover of the electrode body is screwed to an external thread of a short tube portion of the electrode mounting saddle.
An anode mounting device in the water pipe cathodic protection described.