JPH10147894A - Method for mounting sacrificial anode and cap used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for mounting a sacrificial anode which allows a rapid and easy mounting and replacing work of the sacrificial anode and surely preventing the inflow of an electrolyte into a through-hole formed at the sacrificial anode and a cap used for the same. SOLUTION: A metallic bolt 20 is welded to the surface of a metallic 1 to be protected and the top end side of the bolt 20 is inserted from one end side of a through-hole 10a formed at the sacrificial anode 10 into the through- hole 10a. A metallic nut 30 is then screwed onto the bolt 20, by which the bolt 20 is mounted at the sacrificial anode 10. A cap 60 is thereafter fitted into the through-hole 10a from the top end side of the through-hole 10a. As a result, the inflow of the electrolyte (sea water) into the through-hole 10a is prevented. As a result, a battery is not formed between the inside surface of the through-hole 10a and the bolt 20 and the nut 30 and the dissolution of the inside surface of the through-hole 10a is previously prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a current / current anode used for cathodic protection and a cap used for the method.

[0002]

2. Description of the Related Art Cathodic protection (cathod protection) is one method of preventing corrosion of metals (for example, hull skins, propulsors, marine heat exchangers, etc.) disposed in electrolytes such as seawater and soft soil.
ic protection) is well known. In cathodic protection, a metal to be protected (referred to as "corrosion-protected metal" in the present specification), such as a member made of a metal having a higher ionization tendency than the metal, such as zinc or aluminum, is provided on the surface of iron. The member is generally referred to as a "power anode".) When the metal to be protected is put in the electrolyte in this state, a battery is formed between the metal to be protected and the current-carrying anode, and the current generated from the battery cancels the corrosion current. Thereby, anticorrosion can be performed.

A conventional method for attaching a galvanic anode to a metal to be protected will be described with reference to FIGS.

First, an example of a conventional galvanic anode will be described with reference to FIG. The galvanic anode 10 includes a main body 11 and a core metal 12 both made of a zinc alloy.

[0005] The main body 11 is formed in a rectangular plate shape. The body 11 has two holes 1 penetrating in its thickness direction.
1a (the two holes 11a have the same configuration and will be described with the same reference numerals). The inner surface of the hole 11a is formed as an inclined surface whose diameter decreases as it goes downward in FIG.

The metal core 12 is disposed at the lower end of the hole 11a (see FIG. 11). The metal core 12 is formed in a thin plate shape, and is embedded inside the main body 11. Core 1
2, a hole 12a penetrating in the thickness direction is formed. The hole 12a has a long hole shape as shown in FIG. The maximum diameter of the hole 12a is smaller than the minimum diameter of the hole 11a, that is, reduced.

The through hole 10a in the thickness direction of the galvanic anode 10 is formed by the hole 11a and the hole 12a. The hole 11a corresponds to an enlarged diameter portion of the through hole 10a, and the hole 12a corresponds to a reduced diameter portion of the through hole 10a. The upper surface of the cored bar 12 corresponds to a step in the through hole 10a.

On the lower surface of the galvanic electrode 10, a rubber sheet 13 for insulation is arranged. In the rubber sheet 13,
In a portion corresponding to the through hole 10a, a through hole (not shown) penetrating in the thickness direction is formed.

Next, a method for attaching the galvanic electrode 10 to the metal 1 to be protected will be described.

First, one end (rear end) 21 of two bolts 20 made of a conductive metal is directly welded to the surface of the metal 1 to be protected. As this bolt, an iron-based material, for example, stainless steel is generally used. Bolt 20 and anticorrosion metal 1
Is set almost perpendicular. The distance between the two bolts 20 is made equal to the distance between the two through holes 10 a in the galvanic anode 10. Next, the two through holes formed in the rubber sheet 13 are inserted through the two bolts 20 to attach the rubber sheet 13 to the bolts 20. Next, the two through holes 10a of the galvanic anode 10 are inserted into the bolt 20 from one end side (the lower end in FIG. 11). Next, a washer 40 and a spring washer 50 made of a conductive metal are attached to each bolt 20.
As a material of the washer 40 and the spring washer 50, for example, stainless steel can be used. Next, a nut 30 made of a conductive metal is screwed into each bolt 20 from its tip 22. As a material of the nut 30,
For example, stainless steel can be used. Nut 30
11 moves downward in FIG. 11 with the screwing, and clamps the stepped portion of the cored bar 12, that is, the through hole 10 a, between the metal 1 to be protected and the metal 1 to be protected via the washer 40 and the spring washer 50. . Thereby, the galvanic anode 10 can be attached to the metal 1 to be protected, and both can be electrically connected.

By the way, as described above, the metal 1 to be protected is protected.
When the galvanic anode 10 attached to the hole is placed in the electrolyte as it is, the inner surface of the through hole 10a, the bolt 20 and the nut 3
0, the battery is formed, and the inner surface of the through hole 10a is dissolved. Then, the metal core 12 sandwiched between the nuts 30 is exposed to the outside and wobble, whereby the tightening force by the nuts 30 is lost and the galvanic anode 10 may be separated from the corrosion-protected metal 1. If separated, the effect of cathodic protection cannot be expected.

Therefore, conventionally, after the nut 30 is tightened, concrete or molten resin is filled into the through hole 10a and solidified. This prevents the electrolyte from entering between the inner surface of the through hole 10a and the bolts 20 and the nuts 30, thereby preventing corrosion of the inner surface of the through hole 10a and ensuring that the galvanic anode 10 is secured to the metal 1 to be protected. Can be attached to.

However, in the above-described conventional method, the concrete or molten resin filled in the through hole 10a adheres to the screw portion of the bolt 20 or the nut 30 and solidifies. Generally, the galvanic anode 10 needs to be replaced with a new one at intervals of several months or years. At the time of replacement, the replacement work cannot be performed unless concrete or resin attached to the bolt 20 or the nut 30 is removed as described above. Therefore, there is a problem that the replacement operation is extremely complicated and the work efficiency is poor.

In some cases, the metal 1 to be protected is disposed so as to extend not only in the horizontal direction but also in the vertical direction or the inclined direction. When the galvanic anode 10 is mounted in such a place, when filling the through-hole 10a with concrete or molten resin, these may flow out before solidification. If it flows out, the through hole 10
Since it is not possible to seal the space between a and the bolt 20 or the nut 30, an electrolyte (seawater) may flow into the through hole 10. For this reason, in the conventional mounting method, there was also a problem that a laborious operation such as filling and solidifying the concrete or molten resin little by little so as not to flow out was required.

Furthermore, since concrete and molten resin often shrink during solidification, unless measures are taken to allow for shrinkage, the electrolyte may enter the inside of the through-hole 10a. For this reason, there has been a problem that the mounting work of the galvanic anode becomes more complicated.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the installation and replacement work of a galvanic anode can be performed in a shorter time and easier than in the prior art. An object of the present invention is to provide a method for mounting a galvanic anode capable of reliably preventing an electrolyte (for example, seawater) from flowing into a through hole formed in the galvanic anode, and a cap used for the method.

[0017]

According to a first aspect of the present invention, there is provided a method for mounting a galvanic anode, comprising the steps of: providing a metal projection on a surface of a metal to be protected; By inserting the tip side into the through hole from one end side of the through hole formed in the galvanic anode, and attaching the protruding portion and the galvanic anode by attaching means housed inside the through hole, In the method for mounting a galvanic anode for attaching the galvanic anode to the surface of the metal to be protected, the other end of the through-hole may be provided after or simultaneously with attaching the protruding portion and the galvanic anode by the attaching means. A cap is fitted into the through hole from the side in a liquid-tight manner.

According to a second aspect of the present invention, in the method for mounting a galvanic anode according to the first aspect, the cap has a cross-sectional shape larger than a cross-sectional shape of the through hole. Further, the cap is made of an elastic material such as rubber or synthetic resin.

According to a third aspect of the present invention, in the method for mounting a galvanic anode according to the second aspect, the cap has a cross-sectional shape at one end side and a cross-sectional shape at the other end side of the through hole. The cross-sectional shape at the other end is made larger than the cross-sectional shape at the other end of the through hole.

According to a fourth aspect of the present invention, in the mounting method of the third aspect, the outer surface of the cap facing the inner surface of the through hole is formed as a gentle slope. .

According to a fifth aspect of the present invention, there is provided a method for mounting a galvanic anode according to any one of the first to fourth aspects, wherein an adhesive is applied to an outer surface of the cap. Into the inside of the through hole.

According to a sixth aspect of the present invention, in the method for mounting a galvanic anode according to any one of the first to fifth aspects, the projecting portion is a bolt, and the rear end of the bolt is provided. Is welded to the surface of the corrosion-resistant metal, the mounting means is a metal nut screwed into the bolt, and the through-hole has an enlarged diameter sized to allow the nut to pass through. Portion, provided on the other end side of the enlarged diameter portion, and
A reduced diameter portion having a size that cannot pass through the nut and a step portion connecting the enlarged diameter portion and the reduced diameter portion are provided, and the galvanic anode is configured to screw the nut from the tip of the bolt to the bolt. It is attached to the anticorrosion metal by directly or indirectly contacting the stepped portion with the stepped portion.

According to a seventh aspect of the present invention, in the method for mounting a galvanic anode according to the sixth aspect, the cap has a substantially columnar shape, and the lower end of the cap is coaxial with the cap. A nut supporting recess into which the nut is non-rotatably fitted, and a bolt insertion hole communicating with the nut supporting recess, penetrating the cap, and having an inner diameter larger than the outer diameter of the bolt. Yes,
The nut is fitted in the nut supporting recess of the cap in advance, and then the nut is screwed into the bolt and the cap is fitted into the through hole at the same time.

A cap according to claim 8 has a base, a cylindrical side wall extending in one direction from the entire circumference of the base, and is made of an elastic material such as rubber or synthetic resin. Wherein the outer side surface of the side wall is formed as an inclined surface whose diameter decreases as the side surface is separated from the base.

According to a ninth aspect of the present invention, in the cap according to the eighth aspect, a bolt insertion hole having an inner diameter larger than an outer diameter of the bolt penetrates the base. Is what you do.

According to a tenth aspect of the present invention, the cap has a substantially columnar shape and is made of an elastic material such as rubber or synthetic resin. The lower end has the nut coaxially therewith. A nut support recess is formed so as to be non-rotatably fitted, and a bolt insertion hole penetrating the cap and communicating with the nut support recess and having an inner diameter larger than the outer diameter of the bolt is formed. Is what you do.

The cap according to claim 11 is the cap according to claims 8 to
11. The cap according to claim 10, wherein the outer surface is formed as a circular arc surface bulging outward in the cap.

According to a twelfth aspect of the present invention, there is provided a method for mounting a galvanic anode.
A metal protrusion is provided on the surface of the anticorrosion metal, and the tip side of the protrusion is inserted into the through hole from one end of a through hole formed in the galvanic anode, and the protruding portion and the galvanic anode are inserted. In a method for mounting the galvanic anode on the surface of the metal to be protected, the insulating paint is applied to the wall surface of the through-hole by attaching the galvanic anode to the surface of the metal to be protected. It is characterized by the following.

[0029]

Next, embodiments of the present invention will be described with reference to the drawings. First, a method for mounting a galvanic anode according to a first embodiment of the present invention will be described with reference to FIG. In the method of mounting the galvanic anode according to the present embodiment,
This is different from the conventional method in that a cap 60 is used instead of filling the through hole 10a with concrete or molten resin. Therefore, members having the same functions as the members used in the conventional method for mounting a galvanic anode are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, the configuration of the cap 60 will be described.

In the present embodiment, the cap 60 is made of natural rubber and synthetic rubber (SBR) in a weight ratio of 3: 3.
Rubber manufactured by mixing at a ratio of 7 is used.
The cap 60 is formed integrally with rubber. The cap 60 has a disc-shaped base 61 and a cylindrical side wall 62 extending in one direction (downward in FIG. 1) from the entire circumference of the base 61. The cap 6
The material of No. 0 may be a member having elasticity and more preferably a material whose quality is not deteriorated by seawater, and may be, for example, a synthetic resin such as vinyl chloride or polyethylene.

The outer side surface 63 of the side wall 62 is shaped to conform to the inner surface shape of the hole 11a. When the outer side surface 63 is fitted into the hole 11a (ie, the through hole 10a), the both sides are liquid-tight. ing. That is, the outer surface 63
Is formed on a gentle inclined surface whose diameter decreases as the distance from the base 61 increases. The outer surface 63 is formed as a circular arc surface bulging outward in the direction of the cap 60 (indicated by a two-dot chain line in FIG. 1). The cross-sectional shape at one end (the lower end in FIG. 1) of the cap 60 is
Hole 11a in the main body 11 (that is, through hole 10a)
Is smaller than the cross-sectional shape at the other end (the upper end in FIG. 1). The cross-sectional shape at the other end of the cap 60 is formed larger than the cross-sectional shape at the other end of the hole 11a (that is, the through hole 10a). FIG. 1 shows a state in which the other end side of the cap 60 is elastically deformed and contracted, so that the cap 60 is housed inside the hole 10a.

Next, a method of mounting the galvanic anode using the cap 60 configured as described above will be described.

Also in the present embodiment, the operation up to the operation of screwing the nut 30 into the bolt 20 and attaching the galvanic anode 10 to the metal 1 to be protected is the same as the conventional one. In the present embodiment, instead of filling the through hole 10a with concrete or molten resin, the side wall 62 of the cap 60 is fitted into the through hole 10a in a liquid-tight manner. here,
Before this fitting operation, an adhesive is applied to the outer surface 63 of the cap 60 in advance. As this adhesive,
An adhesive (trade name “for Bond G17 tube”: manufactured by Konishi Co., Ltd.) composed of chlorobrene rubber, an alkylphenol resin, an organic solvent and the like can be used. After the fitting operation, the upper surface of the cap 60 and the main body 1
An adhesive is applied to a boundary portion between the cap 1 and the inner surface of the through hole 10a to improve the sealing property.

According to the method of this embodiment, the cap 60
Into the through hole 10a in a liquid-tight manner,
It is possible to prevent electrolyte such as seawater from flowing between the nut and the nut 30 and the inner surface of the through hole 10a.
This operation is much easier than the conventional operation of filling and solidifying concrete,
Work can be performed without skill.

In the mounting method of the present embodiment,
When removing the galvanic anode 10 from the metal 1 to be protected, the cap 60 can be removed very easily by, for example, inserting the tip of a screwdriver between the cap 60 and the through hole 10a. Further, in the present embodiment, since there is no possibility that concrete or resin adheres to the bolt 20 and the nut 30, the bolt 20 and the nut 30 can be reused immediately after the cap 60 is removed.
Therefore, there is an advantage that the exchange work of the current carrying anode 10 can be easily performed in a short time.

Further, in the conventional method, when the galvanic anode 10 is disposed in the vertical direction or the oblique direction, there is a possibility that concrete or molten resin may flow out of the through hole 10a. For example, since the cap 60 is used, even when the galvanic anode 10 is arranged in a vertical direction or an oblique direction, the work of mounting the galvanic anode 10 can be performed without worrying about the outflow of concrete or molten resin. . Therefore, there is an advantage that the mounting operation is facilitated and the efficiency can be improved.

The cap 60 according to the present embodiment is
The cross-sectional shape at one end (lower end in FIG.
Since it is smaller than the cross-sectional shape of the other end of Oa (the upper end in FIG. 1), there is an advantage that the fitting operation of the cap 60 is easy.

In the cap 60 according to the present embodiment, the cross-sectional shape at the other end (the upper end in FIG. 1) of the cap 60 is formed larger than the cross-sectional shape at the other end of the hole 11a. Since the material of 60 is an elastic material such as rubber, the outer surface of the cap 60 is deformed while being strongly pressed against the hole 11a, that is, the inner surface of the through hole 10a, and is pushed into the inside of the through hole 10a. Therefore, the outer surface of the cap 60 can be securely brought into close contact with the inner surface of the through hole 10a, and the electrolyte can be reliably prevented from flowing into the inside of the through hole 10a. Thereby, corrosion of the inner surface of the through hole 10a can be more reliably prevented.

Further, in the present embodiment, since the outer surface 63 of the cap 60 is formed as a gentle slope, there is an advantage that the work of fitting the cap 60 into the through hole 10a is easier.

In addition, in the present embodiment, since the outer surface 63 of the cap 60 is formed as an arc surface bulging outward in the cap 60, the adhesion between the outer surface 63 and the inner surface of the through hole 10a is improved. Thus, corrosion of the inner surface of the through hole 10a can be more reliably prevented. Furthermore, by making the outer surface 63 a circular arc surface bulging outward, in a wide range in the axial direction of the outer surface 63,
The outer side surface 63 and the through hole 10a can be securely brought into close contact with each other. The galvanic anode 10 gradually corrodes and becomes thinner during use. If the inside of the through hole 10a is sealed by bringing the cap 60 into contact with the inner surface of the through hole 10a only at the open end of the through hole 10a, the through hole 10a Inner surface and cap 6
0 may be separated and an electrolyte such as seawater may flow between them, so that the anode 10 must be replaced as soon as possible. However, in the present embodiment, the outer surface 6
3, the outer surface 63 and the through-hole 10a can be securely brought into close contact with each other over a wide range in the axial direction.
There is an advantage that the galvanic anode can be used for a long time, and the frequency of replacement work can be reduced.

In this embodiment, after the adhesive is applied to the outer surface 63 of the cap 60, the cap 60 is fitted into the through hole 10a and the two are adhered to each other.
3 and the inner surface of the through hole 10a can be further improved.

In the above embodiment, the nut 30 is tightened through the washer 40 and the spring washer 50. However, the nut 30 may be directly tightened to the core 12.

In the above-described embodiment, the step is formed inside the through hole 10a by the cored bar 12. However, the step may be formed inside the through hole 10a by molding or machining. Good.

Further, in the above embodiment, two through holes 10a are formed, but the number of through holes 10a may be one or three or more.

Next, another embodiment of the present invention will be described with reference to a plurality of examples. In the embodiment shown in FIG. 1, when the length of the bolt 20 to be welded to the metal 1 to be protected is longer than a specified length, the cap 6 fitted to the galvanic anode 10 is used.
The upper end portion 22 of the bolt 20 interferes with the base portion 61 of the cap 60, causing a problem that the fitting of the cap 60 is incomplete. In addition, although the bolt 20 is cut so that its length is approximately equal to the specified length, if the accuracy of the length is to be improved, not only the productivity of the bolt 20 is lowered but also the cost is increased. In view of the above point, the length of the bolt is irregular.

The second embodiment shown in FIG. 2 is an improvement of the one shown in FIG. 1 in view of the above circumstances. That is, the cap 60 used in the method for mounting a galvanic anode according to the second embodiment has a bolt insertion hole 61 having an inner diameter slightly larger than the outer diameter of the bolt 20 at the center of the base 61a.
a is formed, and the other structure is the same as that of FIG. In the present embodiment, even when the bolt 20 is longer than the specified length, the upper end 22 of the bolt 20 is
Since the bolt 20 is inserted into the bolt insertion hole 60a of the
0 can be completely fitted into the through hole 10a. After the cap 60 is completely inserted into the through hole 10a, the bolt insertion hole 61a is filled with an adhesive or a putty (not shown) to seal the bolt insertion hole 61a. Other steps are the same as those in FIG.

FIG. 3 is an enlarged sectional view of a main part of a galvanic anode according to a third embodiment of the present invention. In the present embodiment,
The height of the columnar cap 2 is substantially equal to the height of the through hole 10a, and the outer surface 2b of the cap 2 is in close contact with the entire inner surface of the through hole 10a.
The inner surface of the through hole 10a is completely shut off from the outside. Further, a bolt insertion hole 2 a having a diameter larger than that of the washer 40 is formed in the center of the cap 2 so as to penetrate therethrough.
As a result, even when the bolt 20 is longer than the specified length (see the bolt 20a), the bolt 2
The cap 2 can be easily and completely fitted into the through hole 10a without the interference of the cap 2 with the cap 2. When the cap 2 is inserted into the through hole 10a, an adhesive or a putty is uniformly applied to the outer surface 2b of the cap 2 beforehand.
Is sealed with an adhesive. Thereby, the electrolytic solution (seawater) does not enter between the outer surface 2b of the cap 2 and the inner surface of the through hole 10a. Figure 1 shows other structures and mounting methods
It is similar to that of

FIG. 4 is an enlarged sectional view of a main part of a galvanic anode according to a fourth embodiment of the present invention. The embodiment of FIG. 4 is a modification of FIG. 3, in which an upper portion, a middle portion and a lower portion of the columnar cap 3 are respectively formed with a nut receiving recess 3b, a bolt through hole 3a and a nut receiving recess 3c. ing. In the present embodiment, after the nut 4 is screwed into the bolt 20, the cap 3 is pushed into the through hole 10a, and at this time, the washer 40,
While the spring washer 50 and the nut 4 are accommodated, the bolt 20 passes through the bolt through hole 3 a of the cap 3. Thereafter, the nut 5 is screwed into the bolt 20.
Note that there is a gap between the nut 5 and the nut accommodating recess 3b that is sufficient to easily turn the nut 5. Finally, an adhesive or a putty is filled in the nut accommodating recess 3b to seal the nut accommodating recess 3b. Even when the bolt 20 is longer than the specified length, the cap 3 is inserted into the through hole 1 without the bolt 20 interfering with the cap 3 as in the third embodiment.
0a can be easily and completely fitted. Also,
The upper nut 5 can reliably prevent the cap 3 from dropping out of the through hole 10a. Other structures and mounting methods are the same as those in FIG.

FIG. 5 is an enlarged sectional view of a main part of a galvanic anode according to a fifth embodiment of the present invention. The embodiment of FIG. 5 is an improvement of FIG. 4, in which the height of the columnar cap 6 is slightly larger than that of FIG. More protruding. The upper end of the cap 6 is a ring-shaped brim 6 d, and the brim 6 d is the main body 11 of the galvanic anode 10.
In close contact with the upper surface of the Thereby, the sealing performance between the outer surface of the cap 6 and the inner surface of the through hole 10a is further improved. Reference numerals 6b, 6a, and 6c denote a nut storage recess, a bolt through hole, and a nut storage recess, respectively. Other structures are the same as those in FIG. In the present embodiment, before the cap 6 is inserted into the through hole 10a, the outer surface of the cap and the flange 6d of the cap 6 are previously determined.
An adhesive or putty is applied to the lower surface of the cap 6, thereby improving the sealing performance between the outer surface of the cap 6 and the inner surface of the through hole 10a.

In the first to fifth embodiments, the bolt 2
After the lower nut 30 (4) is screwed into the hole 0, the cap 60 (2, 3, 6) is fitted into the through hole 10a. In the sixth to eighth embodiments described later, this screwing and fitting is performed. Are performed at the same time.

FIG. 6A is an enlarged cross-sectional view of a main part of a galvanic anode according to a sixth embodiment of the present invention, and FIG.
It is a top view of the cap shown in (a). The cap 7 used in the method for mounting the galvanic anode according to the sixth embodiment has a substantially columnar shape, and has a lower end coaxial with the lower end.
Nut support recess 7 into which nut 30 is fitted so that it cannot rotate.
In addition, a bolt insertion hole 7b communicating with the nut supporting recess 7a, penetrating the cap 7, and having an inner diameter larger than the outer diameter of the bolt 20 is formed. In addition, concave portions 7c and 7d are formed on the upper surface of the cap 7 at positions opposite to the center of the cap 7 at substantially the same diameter. Further, the lower end of the nut 30 projects slightly below the lower surface of the cap 7, whereby the nut 30 is securely brought into contact with the spring washer 50,
An energizing effect can be obtained, and this is the same in FIGS. 7 and 8 described later.

In the method for mounting a galvanic anode according to the sixth embodiment, first, the nut 30 is fitted into the nut support recess 7b of the cap 7, and an adhesive or putty is evenly applied to the outer surface of the cap 7. Keep it. Then, a pair of tips of pliers (or pliers, not shown) are inserted into the recesses 7c and 7d, respectively, and the center of the cap 7 is sandwiched between the pair of tips, thereby holding the cap 7 with the pliers. 7 to rotate through hole 10
The nut 30 can be screwed into the bolt 20 while being fitted in a. Finally, the boundary between the upper surface of the cap 7 and the main body 11 is sealed with an adhesive or putty,
The bolt insertion hole 7a of the cap 7 is filled with an adhesive or putty (not shown) and sealed.

According to the sixth embodiment, the step of screwing the nut 30 into the bolt 20 and the step of screwing the
a can be performed simultaneously, and the nut 30
When the screw is screwed into the bolt 20, the nut 30 is
The nut 30 can be prevented from falling off,
Workability is greatly improved. The recesses 7c and 7d are not always necessary. In this case, the cap 7 is directly held by hand and rotated to fit into the through hole 10a. However, by providing the recesses 7c and 7d, the cap 7 can be easily fitted as compared with the case where the cap 7 is rotated by hand (FIG. 3).

FIG. 7 is an enlarged sectional view of a main part of a current carrying anode according to a seventh embodiment of the present invention. In this embodiment, the cap 8 has a right cylindrical outer peripheral surface 8f, and the lower end of the cap 8 is in line contact with the through hole 10a. The upper end of the cap 8 protrudes from the upper surface of the main body 11 of the galvanic anode 10. The upper end of the cap 8 is a ring-shaped flange 8 e, which is in close contact with the upper surface of the main body 11 of the galvanic anode 10. Thereby, the through hole 1
0a is isolated from the outside world.

On the upper surface of the cap 8, a recess 8 similar to that shown in FIG.
c and 8d are formed, and reference numeral 8a denotes a nut support recess 8a for accommodating the nut 30 so that it cannot rotate.
Indicates a bolt insertion hole. In the method for mounting the galvanic anode according to the seventh embodiment, the nut 30 is previously fitted into the nut supporting recess 8 a of the cap 8, and then the nut 30 is bonded to the lower surface of the flange 8 e of the cap 8 and the outer peripheral surface of the bolt 20. Apply the agent. Next, a pair of tips of pliers (or pliers), not shown, are inserted into the recesses 8c and 8d, respectively, and the center of the cap 8 is sandwiched between the pair of tips, thereby holding the cap 8 with the pliers. While rotating 8 into the through hole 10a,
The nut 30 can be screwed into the bolt 20. Finally, an adhesive or a putty (not shown) is applied to the boundary between the bolt insertion hole 8b and the bolt 20, and sealed.

FIG. 8 is an enlarged sectional view of a main part of a galvanic anode according to an eighth embodiment of the present invention. This embodiment is obtained by adding a double nut method to the embodiment of FIG. A nut storage recess 9b, a bolt through hole 9a, and a nut support recess 9c are formed at the upper end, the middle, and the lower end of the columnar cap 9, respectively.

In the method for mounting the galvanic anode according to the eighth embodiment, the nut 4 is previously fitted into the nut supporting recess 9c of the cap 9, and then the adhesive or putty is applied to the outer peripheral surface of the cap 9. Keep it. Then cap 9
The nut 30 is screwed into the bolt 20 while the cap 9 is rotated and fitted into the through hole 10 a while holding and holding. Next, the nut 5 is screwed into the bolt 20, and finally, the nut receiving recess 9 b is filled with an adhesive or putty to seal the bolt insertion hole 9 a, and the adhesive is also applied to the boundary between the upper surface of the cap 9 and the main body 11. Alternatively, putty is applied. In this embodiment, the fitting of the cap 9 and the screwing of the nut 4 can be performed at the same time, and the nut 5 can reliably prevent the cap 9 from falling off.

In the first to eighth embodiments, the cap is used. In the embodiment shown in FIG. 9, an insulating paint 70 such as paint is applied to the inner surface of the through hole 10a without using the cap. It is. As a result, the inner surface of the through hole 10a is cut off from the outside world and does not come into contact with seawater, and no battery is formed between the inner surface and the bolt 20 and the nut 30. In the embodiment of FIG. 9, the cap and the adhesive (putty)
And the like become unnecessary, and the cost is reduced.

[0060]

Since the present invention is configured as described above, it has the following effects. In the method for mounting a galvanic anode according to claim 1, after or simultaneously with the mounting of the projection and the galvanic anode, the cap is liquid-tightly inserted into the through hole from the other end of the through hole. The current-flow anode can be mounted and replaced more quickly and easily than before, and the electrolyte can be reliably introduced into the through-hole formed in the current-flow anode. There is an effect that can be prevented.

According to a second aspect of the present invention, there is provided a method for mounting a galvanic anode according to the first aspect, wherein the cap has a cross-sectional shape larger than a cross-sectional shape of the through-hole, and Since the cap is made of an elastic material, the outer surface of the cap can be securely adhered to the inner surface of the through hole, and the electrolyte can be reliably prevented from flowing into the through hole. This allows
Corrosion of the inner surface of the through hole can be more reliably prevented.

According to a third aspect of the present invention, in the method for mounting a galvanic anode according to the second aspect, the cap has a cross section at one end smaller than that at the other end of the through hole. In addition, since the cross-sectional shape at the other end side is configured to be larger than the cross-sectional shape at the other end side of the through hole, the work of attaching the cap to the through hole is easy, and the close contact between the two. Properties can be further improved.

According to a fourth aspect of the present invention, in the method for mounting a galvanic anode according to the third aspect, the outer surface of the cap facing the inner surface of the through hole is formed as a gentle slope. Therefore, the work of fitting the cap into the through hole is further facilitated.

According to a fifth aspect of the present invention, there is provided a method for mounting a galvanic anode according to any one of the first to fourth aspects, wherein an adhesive is applied to an outer surface of the cap, and Is fitted into the through hole, so that the adhesion between the cap and the through hole can be more reliably improved.

In the method for mounting a galvanic anode according to claim 6, the mounting can be performed quickly and easily by a combination of bolts and nuts.

According to a seventh aspect of the present invention, in the method of mounting a galvanic anode, even if the bolt is longer than the specified length, the bolt does not interfere with the cap, the cap can be completely inserted into the through hole, and the nut bolt is fixed. Screwing into the cap and fitting into the through hole of the cap can be performed at the same time, and the mounting is further facilitated. Moreover, when the nut is screwed into the bolt, the nut is held by the cap, so that the nut can be prevented from falling off, and workability is greatly improved.

The cap according to claim 8 is made of an elastic material, and the outer surface of the side wall is formed as an inclined surface whose diameter decreases as the distance from the base increases, so that the cap is attached to the through hole in the galvanic anode. Work can be done easily.

According to the ninth aspect of the present invention, even when the bolt is longer than the specified length, the upper end of the protrusion is inserted into the bolt insertion hole of the cap, so that the protrusion does not interfere with the base of the cap. Can be completely fitted into the through hole.

The cap according to claim 10 is the cap according to claim 10.
In addition to the effects described above, the screwing of the nut into the bolt and the fitting of the cap into the through-hole can be performed at the same time, and the mounting is further facilitated. Moreover, when the nut is screwed into the bolt, the nut is held by the cap, so that the nut can be prevented from falling off, and workability is greatly improved.

According to the eleventh aspect, the outer surface is
Because it was formed on an arc surface that swelled outward from the cap,
The adhesion between the cap and the through hole can be further improved. Further, even after a certain period of time, the adhesion between the two can be maintained, so that when used for a galvanic anode, there is an effect that the exchange frequency of the galvanic anode can be reduced. is there.

According to a twelfth aspect of the present invention, there is provided a method for mounting a galvanic anode,
Since the inner surface of the through hole of the cap is coated with the insulating paint, the cap and the adhesive (putty) are not required, and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a galvanic anode according to a first embodiment of the present invention, showing a portion corresponding to FIG.

FIG. 2 is an enlarged cross-sectional view of a main part of a galvanic anode according to a second embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of a galvanic anode according to a third embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a galvanic anode according to a fourth embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of a main part of a galvanic anode according to a fifth embodiment of the present invention.

FIG. 6A is an enlarged sectional view of a main part of a galvanic anode according to a sixth embodiment of the present invention, and FIG. 6B is a plan view of the cap shown in FIG.

FIG. 7 is an enlarged cross-sectional view of a main part of a galvanic anode according to a seventh embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a main part of a galvanic anode according to an eighth embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part of a galvanic anode according to a ninth embodiment of the present invention.

FIG. 10 is a plan view showing a conventional galvanic anode.

11 is a cross-sectional view of a main part along the line AA in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrosion-proof metal 10 Current-carrying anode 10a Through-hole 11 Body of current-carrying anode 11a Hole (increased portion in through-hole) 12 Core (stepped portion in through-hole) 12a Hole (reduced-diameter portion in through-hole) 13 Rubber sheet Reference Signs List 20 bolt 21 rear end of bolt 22 tip of bolt 30 nut (attachment means) 40 washer 50 spring washer 60 cap 61 base 62 side wall 63 outer surface

Continuation of the front page (72) Inventor Hajime Nakamura 1-8-30 Tenmabashi, Kita-ku, Osaka-shi, Osaka Prefecture 28th floor of OAP Tower Mitsubishi Materials Corporation Osaka branch office (72) Inventor Katsuyoshi Oku Kita-ku, Osaka-shi, Osaka 1-8-30 Temmabashi 28th floor of OAP Tower Mitsubishi Materials Corporation Osaka branch office (72) Inventor Tomio Usami 5-1, Otemachi 1-chome, Chiyoda-ku, Tokyo Inside Mitsubishi Materials Corporation (72) Inventor Sakuraba Toshihiro 1-5-1, Otemachi, Chiyoda-ku, Tokyo Mitsubishi Materials Corporation

Claims (12)

[Claims] 1. A metal projection is provided on the surface of a corrosion-protected metal, and a tip side of the projection is inserted into the through-hole from one end of a through-hole formed in a galvanic anode. By attaching the galvanic anode to the metal to be protected by mounting the galvanic anode on the surface of the metal to be protected by attaching the galvanic anode to the through-hole, the projecting portion and the current A method of mounting a galvanic anode, wherein a cap is liquid-tightly fitted into the through-hole from the other end of the through-hole after or simultaneously with the mounting of the electro-anode by the mounting means. 2. A method according to claim 1, wherein said cap has a cross-sectional shape larger than a cross-sectional shape of said through-hole, and said cap is made of an elastic material such as rubber or synthetic resin. The method for mounting the galvanic anode according to claim 1. 3. The cap has a cross-sectional shape at the one end side smaller than a cross-sectional shape at the other end side of the through-hole, and a cross-sectional shape at the other end side is larger than a cross-sectional shape at the other end side of the through-hole. 3. The method for mounting a galvanic anode according to claim 2, wherein the diameter of the anode is also increased. 4. The method according to claim 3, wherein an outer surface of the cap facing the inner surface of the through hole is formed as a gentle slope. 5. The galvanic anode according to claim 1, wherein the cap is fitted into the through-hole after applying an adhesive to the outer peripheral surface of the cap. Mounting method. 6. The projection is a bolt, the rear end of the bolt is welded to the surface of the metal to be protected, and the mounting means is a metal nut screwed into the bolt. A diameter-enlarging portion sized to allow the nut to pass through the through-hole; a reduced-diameter portion provided at the other end of the diameter-enlarging portion and sized so that the nut cannot pass through; A step portion connecting the diameter portion and the reduced diameter portion is provided,
The said galvanic anode is attached to the above-mentioned anticorrosion metal by screwing up the above-mentioned nut from the tip of the above-mentioned bolt to the above-mentioned bolt, and applying directly or indirectly to the above-mentioned level difference part. 6. The method for mounting a galvanic anode according to any one of items 5 to 5. 7. The cap has a substantially columnar shape, and at the lower end of the cap, a nut support recess is formed coaxially with the cap so that the nut is non-rotatably fitted. A bolt insertion hole having an inner diameter larger than the outer diameter of the bolt is formed to communicate with the cap, and the nut is previously fitted in the nut support recess of the cap. 7. The method of claim 6, wherein the cap is fitted into the through hole at the same time as the screw is screwed into the bolt. 8. A cap having a base and a cylindrical side wall extending in one direction from the entire circumference of the base and comprising a resilient material such as rubber or synthetic resin. The outer surface of the cap is formed on an inclined surface whose diameter decreases as the distance from the base increases. 9. The cap according to claim 8, wherein a bolt insertion hole having an inner diameter larger than an outer diameter of the bolt penetrates the base. 10. A cap having a substantially columnar shape and made of an elastic material such as rubber or synthetic resin, wherein the lower end is coaxially fitted with the nut so that it cannot rotate. A cap, wherein a support recess is formed, and a bolt insertion hole penetrating the cap and communicating with the nut support recess and having an inner diameter larger than an outer diameter of the bolt is formed. 11. The cap according to claim 8, wherein the outer surface is formed as an arc surface bulging outward in the cap. 12. A protruding portion made of metal is provided on the surface of the anticorrosion metal, and a tip side of the protruding portion is inserted into the through hole from one end side of a through hole formed in the galvanic anode, and the protruding portion is formed. By attaching the galvanic anode to the wall of the through-hole by attaching the galvanic anode to the surface of the anticorrosion-protected metal by attaching the galvanic anode with the attaching means housed inside the through-hole. A method for mounting a galvanic anode, characterized by applying an insulating paint.