JP2015145524A - Electric anticorrosion construction method, and anode member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric anticorrosion construction method in which an anticorrosive current can be supplied effectively to each of a metallic material buried on the surface side of a structure and another metallic material buried on the inside of the structure, which inside is deeper than the surface side thereof.SOLUTION: In the electric anticorrosion construction method, a surface side anode part 1a is arranged, which is buried in a surface side metallic material Y1-buried region of the structure X and used for supplying the anticorrosive current to the surface side metallic material Y1, and an inside anode part 1b is arranged, which is buried in an inside metallic material Y2-buried region of the structure X in a state electrically-separated from the surface side anode part 1a and used for supplying the anticorrosive current to the inside metallic material Y2. The surface side anode part 1a is connected electrically to the surface side metallic material Y1 while interposing a surface side current supplying means 2a for supplying a current to the surface side anode part 1a side therebetween. The inside anode part 1b is connected electrically to the inside metallic material Y2 while interposing an inside current supplying means 2b for supplying another current to the inside anode part 1b side therebetween.

Description

  The present invention relates to an anticorrosion method and an anode member for performing anticorrosion on a plurality of metal materials embedded in a structure.

  Steel materials such as rebars embedded in structures formed using concrete or the like are inherently protected from corrosion because a passive film is formed on the surface. However, when such a structure deteriorates with time, a crack may be generated on the surface of the structure or a gap may be generated inside the structure. In such a case, there is a possibility that moisture and chlorine components penetrate into the structure through cracks and gaps, and the steel material is partially corroded (metal ions are eluted).

  When the steel material is partially corroded, a corroded portion and a non-corroded portion are formed in the steel material, and a potential difference is generated between the portions. When such a potential difference occurs, a corrosion current flows in the steel material from the corroded portion toward the non-corroded portion. And since such a corrosion current flows in steel materials, the elution of the metal ion from the corroded part is accelerated | stimulated, and corrosion of steel materials further advances.

  As a method of preventing the corrosion of the steel material generated as described above, a current (anticorrosion current) is supplied to the steel material in the structure to eliminate the potential difference generated in the steel material, and the corrosion current is generated in the steel material. A cathodic protection method has been proposed. As a method of supplying an anticorrosion current to steel materials, an anode material formed using a material such as titanium is installed in a structure, and a method in which an anticorrosion current is continuously passed between the anode material and the steel material is known. It has been.

  As a method of installing the anode material in the structure, for example, a method of installing an anode material (titanium mesh or the like) in a planar shape in a predetermined region of the surface of the structure or a hole for accommodating the anode material in the structure is perforated. And after inserting an anode material in this accommodation hole, the method of installing an anode material in a structure by embedding an accommodation hole with mortar etc. is proposed (refer patent document 1). In particular, when there is a steel material embedded on the surface side of the structure and a steel material embedded inside the structure than the steel material, an accommodation hole is formed so as to reach each steel material, A method of supplying an anticorrosion current to each steel material by installing the anode material in the vicinity of each steel material by accommodating the anode material in the accommodation hole is adopted.

JP 2009-179876 A

  However, depending on the environment in which the structure is installed, the easiness of the flow of the anticorrosion current in each region may differ between the region on the surface side of the structure and the region inside the region. For example, in the region on the surface side of the structure, since salt penetrates from the outside, the salt concentration becomes higher than the region inside the structure, and the anticorrosion current easily flows. In such a case, the anticorrosion current to be supplied to the steel material embedded in the region where the anticorrosion current hardly flows (specifically, the inner region) is an area where the anticorrosion current easily flows (specifically, the region on the surface side). ) Embedded in the steel material side, and it becomes difficult to effectively supply the anticorrosion current to the steel material embedded in the region where the anticorrosion current hardly flows (specifically, the inner region).

  Therefore, the present invention can effectively supply the anticorrosion current to each of the metal material embedded on the surface side of the structure and the metal material embedded inside the structure than the metal material. It is an object of the present invention to provide a cathodic protection method and an anode member.

  The cathodic protection method according to the present invention includes a surface-side metal material embedded in a region on the surface side of a structure and a region inside the structure relative to the surface-side metal material among a plurality of metal materials embedded in the structure. An anti-corrosion method for performing anti-corrosion with respect to each of the inner metal material embedded in the surface, wherein the surface-side metal material is embedded in a region where the surface-side metal material in the structure is embedded, and the anti-corrosion current is applied to the surface-side metal material. A surface-side anode portion for supplying the inner metal material, and an inner anode for supplying a corrosion-proof current to the inner metal material embedded in a state where the inner metal material is buried in the structure in a state of being electrically separated from the surface-side anode portion The surface side metal material and the surface side anode part are electrically connected via a surface side current supply means for supplying current to the surface side anode part side, and the inner metal material and the inner anode part are Supply current to the inner anode side Characterized in that it is electrically connected via the inner current supply means.

  According to such a configuration, the surface-side anode portion and the surface-side metal material are electrically connected via the surface-side current supply means, and the inner anode material portion and the inner metal material are connected via the inner current supply means. By being electrically connected to each other, a circuit capable of supplying the anticorrosion current to the surface side metal material and a circuit capable of supplying the anticorrosion current to the inner metal material are separately formed. As a result, by adjusting the surface side current supply means for the surface side metal material, it is possible to supply the optimum anticorrosion current from the surface side anode part, and for the inner side metal material, the inner side current By adjusting the supply means, an optimum anticorrosion current can be supplied from the inner anode part.

  For this reason, the environment around the surface-side metal material in the structure (environment in the region on the surface side of the structure), and the environment around the inner metal material in the structure (environment in the region inside the structure) However, even in an environment where the anticorrosion current flows easily, an anticorrosion current suitable for each environment can be supplied by adjusting each current supply means. Thereby, anticorrosion current can be effectively supplied to each of the surface side metal material and the inner side metal material.

  After the surface side anode part and the inner side anode part are accommodated in one hole continuously formed from the surface of the structure to each region where the surface side metal material and the inner side metal material are embedded, It is preferable that the surface side anode part and the inner anode part are embedded in the structure by embedding the holes.

  According to such a configuration, the surface side anode part and the inner anode part can be embedded in the structure by accommodating the surface side anode part and the inner anode part in one hole formed in the structure. is there. For this reason, the embedding of the surface side anode part and the inner side anode part can be performed more efficiently than the case where a plurality of holes are formed to accommodate each of the surface side anode part and the inner side anode part. Thereby, the operation | work which embeds a surface side anode part and an inner side anode part in the existing structure can be performed rapidly.

  The anode member according to the present invention is an anode member comprising a surface side anode part and an inner side anode part in the above-described cathodic protection method, wherein the surface side anode part is a surface side metal via a surface side current supply means. The inner anode part is configured to be electrically connectable to the inner metal material through the inner current supply means.

  According to such a configuration, the surface-side anode portion and the surface-side metal material can be electrically connected via the surface-side current supply means, and the inner anode material portion and the inner metal material can be connected via the inner current supply means. Therefore, the circuit capable of supplying the anticorrosion current to the surface side metal material and the circuit capable of supplying the anticorrosion current to the inner metal material are separately formed. As a result, by adjusting the surface side current supply means for the surface side metal material, it is possible to supply the optimum anticorrosion current from the surface side anode part, and for the inner side metal material, the inner side current By adjusting the supply means, an optimum anticorrosion current can be supplied from the inner anode part.

  For this reason, the environment around the surface-side metal material in the structure (environment in the region on the surface side of the structure), and the environment around the inner metal material in the structure (environment in the region inside the structure) However, even in an environment where the anticorrosion current flows easily, an anticorrosion current suitable for each environment can be supplied by adjusting each current supply means. Thereby, anticorrosion current can be effectively supplied to each of the surface side metal material and the inner side metal material.

  As described above, according to the present invention, the anticorrosion current can be effectively applied to each of the metal material embedded on the surface side of the structure and the metal material embedded on the inner side of the structure than the metal material. Can be supplied.

Schematic which showed the cathodic protection method which concerns on 1st embodiment of this invention. Schematic which showed the cathodic protection method which concerns on 2nd embodiment of this invention.

<First embodiment>
A first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the cathodic protection method according to the present embodiment includes a plurality of metal materials (specifically, steel materials) Y embedded in a structure X (specifically, a concrete structure), Electrocorrosion protection is applied to each of the surface-side metal material Y1 embedded in the region on the surface side of the structure X and the inner metal material Y2 embedded in the region inside the structure X with respect to the surface-side metal material Y1. Is what you do.

In the structure X, the region where the surface-side metal material Y1 is embedded (hereinafter also referred to as the surface-side region) flows more easily than the region where the inner metal material Y2 is embedded (hereinafter also referred to as the inner region). There is a case. For example, when the structure X is a concrete structure, if the structure X is installed in an environment (such as a coastal area) that easily comes into contact with the salt, the surface side region is more likely to penetrate into the surface side region. The salt concentration becomes higher. Specifically, the salt concentration of the surface side region in the concrete structure is not particularly limited, but may be 1.2 kg / m ³ or more. On the other hand, the salt concentration in the inner region of the concrete structure is not particularly limited, but is considered to be less than 1.2 kg / m ³ .

  Further, the surface side metal material Y1 is preferably embedded in a region of 3 cm to 10 cm from the surface of the structure X, and more preferably embedded in a region of 7 cm to 10 cm. The inner metal material Y2 is preferably embedded in a region of 13 cm or more and 20 cm or less from the surface of the structure X, and more preferably embedded in a region of 17 cm or more and 25 cm or less.

  In the present embodiment, the structure X is embedded with metal material connecting means Z for electrically connecting the surface-side metal material Y1 and the inner metal material Y2 (specifically, connecting at a plurality of locations). Is done. Specifically, the metal material connecting means Z is composed of a metal material (hereinafter also referred to as a connected metal material) embedded in the structure X in contact with the surface-side metal material Y1 and the inner metal material Y2. Thereby, the surface side metal material Y1 and the inner side metal material Y2 are electrically connected by the connection metal material Z.

  Further, in the structure X, a surface side anode part 1a (specifically, a plurality of surface side anode parts 1a) for supplying a corrosion-proof current to the surface side metal material Y1, and an inner side metal material Y2 are provided. The inner anode part 1b (specifically, a plurality of inner anode parts 1b) that supplies the anticorrosion current is embedded in an electrically separated state. In this embodiment, the surface side anode part 1a and the inner side anode part 1b are comprised from anode materials, such as a titanium mesh and a titanium plate.

  And the surface side anode part (hereinafter also referred to as surface side anode material) 1a is embedded in the surface side region where the surface side metal material Y1 is embedded, and the inner side anode part (hereinafter also referred to as inner side anode material) 1b is The inner metal material Y2 is embedded in the inner region. In other words, the surface-side anode material 1a and the inner anode material 1b have different positions in the depth direction of the structure X (specifically, the direction from the surface of the structure X toward the center in the structure X). Buried in Specifically, the surface-side anode material 1a and the inner anode material 1b are spaced apart in the depth direction of the structure X (specifically, the surface-side anode material 1a and the inner anode material 1b are not short-circuited). Arranged at a certain interval). That is, the surface side anode material 1a and the inner side anode material 1b are arranged in an electrically separated state. As a space | interval of the surface side anode material 1a and the inner side anode material 1b, it is preferable that it is 0.1 cm or more in the depth direction of the structure X, for example, and it is more preferable that it is 1 cm or more.

  The method for embedding the surface-side anode material 1a and the inner anode material 1b in the structure X is not particularly limited. For example, when the structure X is formed, the structure is formed together with the metal materials Y1 and Y2. Each anode material 1a, 1b may be embedded in X. Alternatively, in one hole (not shown) continuously formed from the surface of the structure X to each region where the surface-side metal material Y1 and the inner metal material Y2 are embedded, the surface-side anode portion 1a and After the inner anode portion 1b is accommodated, the surface-side anode portion 1a and the inner anode portion 1b may be embedded in the structure X by embedding the holes. Thus, by embedding the surface-side anode portion 1a and the inner anode portion 1b in one hole formed in the structure X, the surface-side anode portion 1a and the inner anode portion 1b are embedded in the structure X. Is possible. For this reason, embedding of the surface side anode part 1a and the inner side anode part 1b can be performed more efficiently than the case where a plurality of holes are formed and each of the surface side anode part 1a and the inner side anode part 1b is accommodated. Thereby, the operation | work which embed | buries the surface side anode part 1a and the inner side anode part 1b in the existing structure X can be performed rapidly.

  And the surface side anode material 1a and the surface side metal material Y1 are electrically connected via the surface side current supply means 2a which supplies an electric current to the surface side anode material 1a side, and the inner side anode material 1b and the inner side metal material Y2 is electrically connected to the inner anode material 1b through an inner current supply means 2b that supplies a current.

  A conductive wire L is used for electrical connection between the surface-side anode material 1a and the surface-side current supply means 2a and electrical connection between the inner anode material 1b and the inner current supply means 2b. The conducting wire L is formed using a material whose surface is insulative, and is configured such that a current flows through the inside thereof. Moreover, in this embodiment, the some surface side anode material 1a is electrically connected with the one surface side current supply means 2a, and the some inner side anode material 1b is electrically connected with the one inner side current supply means 2b ( Specifically, they are connected via a conducting wire L).

  In the present embodiment, the surface-side current supply means 2a and the inner-side current supply means 2b are electrically connected to the surface-side metal material Y1 (specifically, the conductor connection portions 3a and 3b) via the conductor L. The Thereby, the inner side anode material 1b and the inner side metal material Y2 will be in the state electrically connected via the surface side metal material Y1 and the connection metal material Z.

  In the cathodic protection method constructed as described above, one circuit is formed in which the surface-side anode material 1a, the surface-side metal material Y1 and the surface-side current supply means 2a are electrically connected, and the inner anode Another circuit is formed in which the material 1b, the inner metal material Y2, and the inner current supply means 2b are electrically connected through the surface-side metal material Y1 and the connecting metal material Z. That is, a circuit that supplies the anticorrosion current to the surface-side metal material Y1 and a circuit that supplies the anticorrosion current to the inner metal material Y2 are formed separately.

  And by supplying a current from the surface side current supply means 2a to the surface side anode material 1a side, it becomes possible to supply the anticorrosion current from the surface side anode material 1a to the surface side metal material Y1. Thereby, a partial potential difference is prevented from occurring in the surface-side metal material Y1 (or the partially generated potential difference is eliminated), and the progress of corrosion of the surface-side metal material Y1 is prevented. On the other hand, by supplying a current from the inner current supply means 2b to the inner anode material 1b side, it becomes possible to supply an anticorrosion current from the inner anode material 1b to the inner metal material Y2. This prevents a partial potential difference from occurring in the inner metal material Y2 (or eliminates the partially generated potential difference), thereby preventing the corrosion of the inner metal material Y2.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. The cathodic protection method according to the second embodiment is mainly different from the cathodic protection method according to the first embodiment in the configuration of the anode that supplies the anticorrosion current to the surface side metal material Y1 and the inner side metal material Y2. is there. Therefore, below, it demonstrates centering on a different point from 1st embodiment, and abbreviate | omits description by attaching | subjecting the same code | symbol to the same structure.

  The cathodic protection method of the present embodiment includes an anode member 4 configured to be able to individually supply a corrosion protection current to both the surface-side metal material Y1 and the inner metal material Y2. The anode member 4 includes a surface-side anode portion 4a that supplies a corrosion-proof current to the surface-side metal material Y1, and an inner anode portion 4b that supplies a corrosion-proof current to the inner metal material Y2. Specifically, the anode member 4 includes an embedded portion 4 c embedded in the structure X and a non-embedded portion 4 d that is not embedded in the structure X. The embedded portion 4c is formed with a surface side anode portion 4a and an inner anode portion 4b made of an anode material such as a titanium mesh or a titanium plate, and the surface side anode portion 4a, the inner anode portion 4b and the non-embedded portion 4d. An insulating portion 4e made of an insulating material is formed between the two. In this embodiment, a part of the anode material is covered with an insulating material, so that an insulating portion 4e is formed, and the surface side anode portion 4a and the inner side are formed by a portion of the anode material that is not covered with the insulating material. Anode portion 4b is formed.

  Moreover, the surface side anode part 4a (or inner side anode part 4b) is formed in the position spaced apart from the inner side anode part 4b (or surface side anode part 4a). In the present embodiment, the front surface side anode portion 4a and the inner side anode portion 4b are formed at positions separated along one direction (the depth direction of the structure X). Thereby, the insulating part 4e is located between the surface side anode part 4a and the inner side anode part 4b. That is, the surface-side anode portion 4a and the inner anode portion 4b are electrically separated.

  And the embedding part 4c (in this embodiment, each embedding part 4c of the some anode member 4) of the above anode members 4 is embed | buried in the structure X, The surface side anode part in the structure X 4a and the inner anode part 4b are embedded. Specifically, the surface-side anode portion 4a is embedded in a surface-side region where the surface-side metal material Y1 is embedded, and the inner anode portion 4b is embedded in an inner region where the inner-side metal material Y2 is embedded. In other words, the surface-side anode portion 4a and the inner anode portion 4b are embedded at different positions in the depth direction of the structure X. At this time, the surface-side anode portion 4a and the inner anode portion 4b are spaced apart in the depth direction of the structure X (specifically, the surface-side anode portion 4a and the inner anode portion 4b are not short-circuited). Placed at intervals). For example, the surface side anode part 4a and the inner side anode part 4b are preferably arranged with an interval of 0.1 cm or more in the depth direction of the structure X, and are arranged with an interval of 1 cm or more. Is more preferable.

  A method of embedding the embedded portion 4c (specifically, the surface side anode portion 4a and the inner side anode portion 4b) in the structure X is not particularly limited. For example, when forming the structure X The embedded portion 4c may be embedded in the structure X together with the metal materials Y1 and Y2. Alternatively, in one hole formed continuously from the surface of the structure X to each region where the surface-side metal material Y1 and the inner metal material Y2 are embedded, the embedded portion 4c (specifically, the surface side After the anode portion 1a and the inner anode portion 1b) are accommodated, the buried portion 4c (specifically, the surface-side anode portion 1a and the inner anode portion 1b) is buried in the structure X by embedding the holes. May be.

  And the surface side anode part 4a is comprised so that electrical connection with the surface side metal material Y1 is possible, and the inner side anode part 4b is comprised so that electrical connection with the inner side metal material Y2 is possible. Specifically, the anode material constituting the surface-side anode portion 4a and the surface-side metal material Y1 can be electrically connected via the surface-side current supply means 2a that supplies current to the surface-side anode portion 4a side. The anode material constituting the inner anode part 4b and the inner metal material Y2 are configured to be electrically connectable via inner current supply means 2b for supplying current to the inner anode part 4b side.

  For the electrical connection between the anode material constituting the surface-side anode part 4a and the surface-side current supply means 2a, and the electrical connection between the anode material constituting the inner anode part 4b and the inside current supply means 2b, A conducting wire L is used. In the present embodiment, the anode material constituting the plurality of surface-side anode portions 4a is electrically connected to the one surface-side current supply means 2a, and the anode material constituting the plurality of inner-side anode portions 4b is located on the inner side. It is electrically connected to the current supply means 2b.

  In the present embodiment, the surface-side current supply means 2a and the inner-side current supply means 2b are electrically connected to the surface-side metal material Y1 (specifically, the conductor connection portions 3a and 3b) via the conductor L. The Thus, the inner metal material Y2 and the anode material constituting the inner anode portion 4b are electrically connected via the surface-side metal material Y1 and the connection metal material Z.

  In the cathodic protection method configured as described above, one circuit is formed in which the surface-side anode portion 4a, the surface-side metal material Y1 and the surface-side current supply means 2a are electrically connected, and the inner anode Another circuit is formed in which the portion 4b, the inner metal material Y2, and the inner current supply means 2b are electrically connected via the surface-side metal material Y1 and the connecting metal material Z. That is, a circuit that supplies the anticorrosion current to the surface-side metal material Y1 and a circuit that supplies the anticorrosion current to the inner metal material Y2 are formed separately.

  And it becomes possible by supplying a current from the surface side current supply means 2a to the surface side anode part 4a side to supply an anticorrosion current from the surface side anode part 4a to the surface side metal material Y1. Thereby, a partial potential difference is prevented from occurring in the surface-side metal material Y1 (or the partially generated potential difference is eliminated), and the progress of corrosion of the surface-side metal material Y1 is prevented. On the other hand, by supplying a current from the inner current supply means 2b to the inner anode part 4b side, it becomes possible to supply an anticorrosion current from the inner anode part 4b to the inner metal material Y2. This prevents a partial potential difference from occurring in the inner metal material Y2 (or eliminates the partially generated potential difference), thereby preventing the corrosion of the inner metal material Y2.

  As described above, the cathodic protection method according to the present invention is more effective for each of the metal material embedded on the surface side of the structure and the metal material embedded inside the structure than the metal material. Can be supplied with a corrosion-proof current.

  That is, the surface-side metal material Y1 and the surface-side anode material 1a (surface-side anode portion 4a) are electrically connected via the surface-side current supply means 2a, and the inner metal material Y2 and the inner anode material 1b (the inner anode material 1a). The part 4b) is a circuit that can be electrically connected via the inner current supply means 2b to supply the anticorrosion current to the surface side metal material Y1, and a circuit that can supply the anticorrosion current to the inner metal material Y2. And are formed separately. Thereby, for the surface side metal material Y1, by adjusting the surface side current supply means 2a, it is possible to supply the optimum anticorrosion current from the surface side anode material 1a (surface side anode part 4a), and The inner metal material Y2 can be supplied with an optimum anticorrosion current from the inner anode material 1b (inner anode portion 4b) by adjusting the inner current supply means 2b.

  For this reason, the environment around the surface-side metal material Y1 in the structure X (environment in the region on the surface side of the structure X) and the environment around the inner metal material Y2 in the structure X (inside the structure X) Even in an environment where the anticorrosive current flows in an environment that is different from that of the region (2), the anticorrosive current suitable for each environment can be supplied by adjusting the current supply means 2a and 2b. Thereby, anticorrosion current can be effectively supplied to each of the surface-side metal material Y1 and the inner metal material Y2.

  Further, since the surface-side metal material Y1 and the inner metal material Y2 are electrically connected by the metal material connecting means Z, the inner current supply means 2b is electrically connected to the surface-side metal material Y1 via the conductor L. However, the inner metal material Y2 and the inner current supply means 2b are electrically connected through the surface side metal material Y1 and the metal material connecting means. Thereby, attachment of the inner side current supply means 2b with respect to the structure X can be performed easily.

  Specifically, since the inner metal material Y2 is embedded inside the region on the surface side of the structure X, it is difficult to connect the inner current supply means 2b from the outside of the structure X. However, as described above, even if the inner current supply means 2b is connected to the surface-side metal material Y1, the inner current supply means 2b and the inner metal material Y2 are electrically connected. The supply means 2b can be easily attached.

  In addition, the cathodic protection method according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. Further, the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined (even if the configurations and methods according to one embodiment are applied to the configurations and methods according to other embodiments). Of course, it is of course possible to arbitrarily select configurations, methods, and the like according to various modifications described below and employ them in the configurations, methods, and the like according to the above-described embodiments.

  For example, in the above embodiment, the surface-side current supply unit 2a and the inner-side current supply unit 2b are electrically connected to the surface-side metal material Y1, but the present invention is not limited to this. For example, the inner-side current supply unit 2b may be electrically connected to the inner metal material Y2. In such a case, the surface side metal material Y1 and the inner metal material Y2 are not connected by the connection metal material Z, and the circuit supplies a corrosion current to the surface side metal material Y1, and the inner metal material Y2 is supplied with the anticorrosion current. The circuit to be supplied is formed separately.

  Further, when embedding the surface-side anode portions 1a, 4a and the inner anode portions 1b, 4b in the structure X, the structure X is perforated to form accommodation holes, and the surface-side anode portion 1a is formed in one accommodation hole. , 4a and inner anode portions 1b, 4b may be accommodated to embed the accommodation holes. Alternatively, a plurality of housing holes may be formed so that only the surface-side anode portions 1a and 4a are housed in one housing hole and only the inner anode portions 1b and 4b are housed in the other housing holes.

  DESCRIPTION OF SYMBOLS 1a ... Surface side anode material, 1b ... Inner anode material, 2a ... Surface side current supply means, 2b ... Inner current supply means, 4 ... Anode member, 4a ... Surface side anode part, 4b ... Inner anode part, 4c ... Embedded part 4d: Non-buried portion, 4e: Insulating portion, L: Conductor, X: Structure, Y1: Surface side metal material, Y2: Inner metal material, Z ... Metal material connecting means

Claims (3)

Of the plurality of metal materials embedded in the structure, the surface-side metal material embedded in the region on the surface side of the structure and the inner metal material embedded in the region inside the structure with respect to the surface-side metal material An anti-corrosion method for performing anti-corrosion on each of them,
A surface-side anode portion that is embedded in a region where the surface-side metal material in the structure is embedded and supplies a corrosion-proof current to the surface-side metal material, and a surface-side anode in a region where the inner metal material is embedded in the structure An inner anode portion that is embedded in a state electrically separated from the portion and supplies an anticorrosion current to the inner metal material,
The surface-side metal material and the surface-side anode part are electrically connected via surface-side current supply means for supplying current to the surface-side anode part side, and the inner metal material and the inner anode part are on the inner anode part side. An electrical corrosion protection method characterized by being electrically connected through an inner current supply means for supplying current to   After the surface side anode part and the inner side anode part are accommodated in one hole continuously formed from the surface of the structure to each region where the surface side metal material and the inner side metal material are embedded, The cathodic protection method according to claim 1, wherein the surface side anode part and the inner side anode part are embedded in the structure by embedding the holes. An anode member comprising a surface side anode part and an inner side anode part in the cathodic protection method according to claim 1 or 2,
The surface-side anode portion is configured to be electrically connectable to a surface-side metal material via a surface-side current supply means, and the inner anode portion is electrically connected to an inner metal material via an inner current supply means. An anode member characterized by being configured.

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