JP2015004113A - Concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete structure in which a corrosion-preventive electrode is easily installed and variation in a protective current is suppressed.SOLUTION: A concrete structure comprises concrete in which metal material is installed, a corrosion-preventive electrode arranged on the surface of the concrete, cement material and aggregate. The concrete structure is also provided with a fixing part which is arranged on the surface of the concrete and fixes the corrosion-preventive electrode to the surface of the concrete while covering the corrosion-preventive electrode, and a waterproof member which has waterproofness and is arranged to cover the surface of the fixing part and the surface of the concrete positioned outside the fixing part. The waterproof member extends to the outside of the edge of the fixing part, and the distance between the extended edge and the corrosion-preventive is 20 mm or more.

Description

  The present invention relates to a concrete structure in which an anticorrosion electrode is installed.

  Conventionally, in order to prevent corrosion of metal materials such as reinforcing bars in concrete structures, an anti-corrosion electrode made of corrosion-resistant metal such as titanium has been installed on the concrete, with the anti-corrosion electrode as the anode and the metal material as the cathode. A technique for supplying a corrosion-proof current between the electrode and the metal material is used.

  For example, a concrete structure in which this type of anti-corrosion electrode is installed is formed by cutting a groove for accommodating a linear electro-corrosion electrode on the surface of the concrete, and directly placing the electrode in the groove, or fixing pins, etc. It has been proposed that the electrode is covered with a filler such as mortar (see Patent Documents 1 and 2).

  However, such a concrete structure must be manufactured by cutting grooves on the surface of the concrete, and the manufacturing work is complicated, and there is a possibility that dust and noise may be generated by cutting the concrete during manufacturing. In addition, when the fixing pin is used, the manufacturing operation becomes more complicated. Furthermore, there is a possibility that water may infiltrate into the concrete through mortar or the like that covers the electrode for anticorrosion due to rain or the like. In such a case, the corrosion prevention current varies.

  On the other hand, an anticorrosive electrode is arranged in the groove, and after filling the groove with a filler such as mortar and covering the anticorrosive electrode, a weather resistant paint is applied so as to straddle the filler and the mortar. A concrete structure has been proposed (see Patent Document 3). However, even if the weather resistant material is applied in this way, there is a possibility that variations in the anticorrosion current occur.

  In addition, a concrete structure has been proposed in which an electrode holder filled with an anticorrosive electrode and a mortar as a filler is fixed to the concrete surface via a resin extendable fixing member (patent) Reference 4). According to such a concrete structure, the work of making a hole in the groove is omitted, but it is necessary to temporarily store the anticorrosive electrode and the filler in the electrode holder, and it is necessary to install it through a fixing member. Manufacturing work becomes complicated. Further, similarly to the above, the corrosion-proof electrode may be varied due to water intrusion into the concrete.

JP 2002-371391 A JP-A-4-116184 JP 2005-256132 A Japanese Patent No. 4144881

  In view of the above problems, an object of the present invention is to provide a concrete structure in which an anticorrosion electrode is easily installed and the variation in the anticorrosion current is relatively small.

The concrete structure according to the present invention is
Concrete with metal material installed inside,
An anticorrosion electrode disposed on the surface of the concrete;
A fixing portion containing a cement material and an aggregate, and being fixed to the surface of the concrete while being disposed on the surface of the concrete and covering the cathodic protection electrode;
A waterproof member having waterproofness and being arranged so as to cover the surface of the fixed portion and the surface of the concrete located outside the fixed portion;
The waterproof member extends outward from the end edge of the fixed portion, and the distance between the extended end edge of the waterproof member and the cathodic protection electrode is 20 mm or more.

  Here, the waterproof property means having a property of 0.5 ml or less in the water permeation test B method of JIS A 6909-2003 “Finish for architectural coating”. Also. The distance between the extended edge of the waterproof member and the cathodic protection electrode means the distance connecting the extended edge and the cathodic protection electrode in the shortest distance.

According to the concrete structure having such a structure, the electric protection electrode is fixed by being covered with the fixing portion on the surface of the concrete in which a metal material is installed, so that the concrete structure can be manufactured. There is no need to cut the concrete surface or make holes in the concrete surface.
In addition, the surface of the fixed part and the concrete surface located outside the fixed part are covered with the waterproof member, and the distance between the extended edge of the waterproof member and the anticorrosive electrode is Since it is 20 mm or more, it is difficult for water to enter the concrete due to rain or the like, and the fluctuation of the moisture content of the concrete in the region that affects the anticorrosion current can be suppressed. Thereby, the variation in anticorrosion current can be suppressed.
Therefore, the anticorrosion electrode can be easily installed, and the concrete structure has a relatively small variation in the anticorrosion current.

  Moreover, in the concrete structure of the said structure, it is preferable that the said distance is more than cover thickness.

  Here, the “cover thickness” means a length connecting the concrete surface and the surface of the metal material with the shortest distance.

  According to such a configuration, it is possible to suppress fluctuations in the moisture content of the concrete that affect the anticorrosion current, and therefore, it is possible to further suppress variations in the anticorrosion current flowing from the electrocorrosive electrode.

In the concrete structure having the above structure,
The waterproof member has a first waterproof member and a second waterproof member,
The first waterproof member is arranged so as to cover the surface of the fixed part,
It is preferable that the second waterproof member is arranged so as to cover at least a part of the surface of the first waterproof member and the surface of the concrete located outside the first waterproof member.

According to such a configuration, the first waterproof member and the second waterproof member can be formed using different materials, formed in separate steps, or the like. For example, at the time of manufacture, the shape of the material for forming the solid portion can be cured while being held by the first waterproof member, and the position of the extended edge can be adjusted by the second prevention member.
In this manner, the first waterproof member and the second waterproof member can be provided with different functions and can share roles. In addition, the anticorrosion electrode is more easily installed, and the concrete structure is further reduced in variation in the anticorrosion current.

In the concrete structure having the above structure,
It is preferable that the waterproof member further has an insulating property.

  Here, the insulating property means that the volume resistivity is 200 kΩ · cm or more in “Volume resistivity measurement method (plan) of cross-sectional restoration material by the four-electrode method” of JSCE-K 562-2008.

  According to such a configuration, since the waterproof member further has an insulating property, it is possible to suppress the current flowing into the concrete from the outside of the waterproof member, and thus it is possible to suppress the variation in the anticorrosive current. .

In the concrete structure having the above structure,
The fixing part preferably further contains an electromagnetic wave shielding material.

  Here, the electromagnetic wave shielding material means a material having an electromagnetic wave shielding performance of 10 dB or more when measured by the Advantest method.

  According to such a configuration, since the fixing portion has the electromagnetic wave shielding material, it is possible to suppress the generation of current inside the concrete due to the influence of the external environment, and thus, it is possible to further suppress the variation in the corrosion prevention current. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, an anticorrosion electrode is installed easily and the concrete structure with few variations in an anticorrosion current is provided.

The schematic sectional drawing which shows the concrete structure of 1st Embodiment of this invention. The schematic top view which shows the concrete structure of this embodiment. The schematic top view which shows other arrangement | positioning of an anti-corrosion electrode in the concrete structure of this real form. The schematic sectional drawing which shows the concrete structure of 2nd Embodiment of this invention. The schematic sectional drawing which shows the concrete structure of 3rd Embodiment of this invention. The schematic sectional drawing which shows the concrete structure manufactured by the manufacture example 1. FIG. The schematic sectional drawing which shows the concrete structure manufactured by manufacture examples 2-4.

  Hereinafter, a concrete structure manufacturing method and a concrete structure embodiment according to the present invention will be described with reference to the drawings.

  First, the concrete structure which concerns on 1st Embodiment of this invention is demonstrated, referring FIGS. 1-3.

  As shown in FIG. 1 and FIG. 2, the concrete structure 100 of the present embodiment includes a concrete 10 in which a metal material 11 is installed, and an anticorrosion electrode 1 disposed on the surface of the concrete 10. A fixing part 4 containing a cement material and an aggregate, arranged on the surface of the concrete 10 and covering the electric protection electrode 1 and fixing to the surface of the concrete 10; The waterproof member 6 is provided so as to cover the surface of the portion 4 and the surface of the concrete 10 located outside the fixed portion 4. The waterproof member 6 extends outward from the end edge of the fixed portion 4, and the distance L between the extended end edge of the waterproof member 6 and the cathodic protection electrode 1 is 20 mm or more. It is configured as follows.

Examples of the concrete 10 include concrete of a concrete structure such as a bridge and a road.
The surface of the concrete 10 may have been subjected to a treatment such as a cleaning treatment or a roughening treatment using a concrete sander or the like in advance. By performing such treatment, the adhesive strength between the concrete 10 surface, the fixing portion 4 and the waterproof member 6 is improved.

In the present embodiment, a metal material 11 such as a steel material is installed inside the concrete 10 on which the anticorrosion electrode is installed. Further, as shown in FIG. 2, the negative (negative) pole side of the external power source B is connected to each metal material 11, and these are applied by applying a voltage between the metal material 11 and the anticorrosion electrode 1. It is comprised so that a corrosion-proof electric current may flow between.
The cover thickness T of the metal material 11 is not particularly limited, but can be set to 1 to 100 mm. Moreover, when the metal material 11 is arranged in multiple numbers, these space | intervals can be set to 50-300 mm, for example.

  The anticorrosive electrode 1 is an anode electrode made of metal. The material of the anticorrosion electrode 1 is not particularly limited as long as it is a metal used as an anode and having corrosion resistance. Examples thereof include platinum-plated titanium electrodes, high silicon cast iron electrodes, graphite electrodes, ferrite electrodes, metal oxide electrodes, and the like.

Examples of the shape of the cathodic protection electrode 1 include a long shape such as a rod shape or a belt shape. Among these, a metal body having an expanded metal network is particularly preferable.
The expanded metal shape refers to the expanded metal shape defined in JIS G 3351 or a shape similar thereto.
In this embodiment, the anticorrosion electrode 1 is arranged in a direction in which the flat portion of the anticorrosion electrode 1 made of a strip-shaped expanded metal is parallel to the surface of the concrete.
Although the width | variety of this cathodic protection electrode 1 is not specifically limited, For example, it can set to 10-50 mm.
When a plurality of the anticorrosion electrodes 1 are arranged, the interval between the anticorrosion electrodes 1 is not particularly limited and can be set as appropriate. For example, it can set so that it may distribute | arrange directly on each metal material 11. FIG. Further, for example, the interval between the anticorrosion electrodes 1 is usually 100 mm or more, but may be less than 100 mm.

  In this embodiment, even if it employ | adopts the aspect in which the cathodic electrode 1 is in direct contact with the concrete 10 surface as shown in FIG. 1, for example, the cathodic electrode 1 is fixed to the fixed portion 4 as shown in FIG. You may employ | adopt the aspect which is contacting the surface of the concrete 10 through a part.

The fixing part 4 contains a cement material and an aggregate, and is arranged on the surface of the concrete 10 to fix the surface of the concrete 10 while covering the electrode 1. As this fixing | fixed part 4, what is formed with mortar, grout, etc. is mentioned.
Examples of the cement material include ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, blast furnace cement, super-hard cement, alumina cement, and mixed cement.
Examples of the aggregate include coarse aggregate and fine aggregate. The coarse aggregate includes known materials used for concrete such as gravel and crushed stone, and the fine aggregate includes known materials used for cement mortar such as quartz sand, crushed sand and pearlite.
The cement material and the aggregate preferably have an electrical resistivity of 100 kΩ · cm or less until the age of 28 days.

  In the present embodiment, the fixing portion 4 is formed in a trapezoidal cross section, but the shape of the fixing portion 4 is not particularly limited. Moreover, the magnitude | size of the fixing | fixed part 4 is also not specifically limited, It can set suitably so that the anticorrosion electrode 1 may be fixed to the concrete 10 surface.

  The fixing portion 4 preferably further contains an electromagnetic wave shielding material. Examples of the electromagnetic wave shielding material include copper, aluminum, and silver. Since the fixing part 4 further contains an electromagnetic wave shielding material, it is possible to suppress an unintended current from being generated inside the concrete 10 due to the influence of the external environment. it can

In addition, the length (width of the fixed portion) that connects the both ends of the fixed portion 4 in the shortest direction in the direction parallel to the surface of the concrete 10 and perpendicular to the longitudinal direction of the anticorrosive electrode 1 (left and right direction in FIG. 1) is: There is no particular limitation as long as it can be fixed to the surface of the concrete 10 while covering the electrode 1. For example, the width can be 15-50 mm.
The length (height) of the fixing portion 4 (upper edge in FIG. 1) in the direction perpendicular to the surface of the concrete 10 (up and down direction in FIG. 1) is also fixed to the surface of the concrete 10 while covering the anticorrosion electrode 1. If possible, it is not particularly limited. For example, the length can be 5 to 40 mm.

The waterproof member 6 is waterproof. Further, the waterproof member 6 extends outward from the end edge of the fixed portion 4 in a direction perpendicular to the longitudinal direction of the electro-corrosive electrode 1, and the extended end edge of the waterproof member 6 and the electro-corrosive electrode It is comprised so that the distance L with 1 may be 20 mm or more. When the distance L is 20 mm or more, the fluctuation of the moisture content of the concrete that affects the anticorrosion current can be suppressed, so that the variation of the anticorrosion current flowing from the electrocorrosion electrode 1 can be further suppressed.
Further, the distance L is preferably equal to or greater than the cover thickness T. Since the distance L is equal to or more than the cover thickness T, the fluctuation of the moisture content of the concrete 10 that affects the anticorrosion current can be further suppressed. Can be suppressed.

In the present embodiment, the waterproof member 6 includes a first waterproof member 6 a and a second waterproof member 6 b, and the first waterproof member 6 a is arranged so as to cover the surface of the fixing portion 4. The second waterproof member 6b covers at least a part of the surface of the first waterproof member 6a and the surface of the concrete 10 located outside the first waterproof member 6a. It is arranged.
Specifically, the first waterproof member 6 a has a waterproof property and functions as a shape holding member that holds the shape of the fixed portion 4. As this 1st waterproofing member 6a, resin-made containers, such as vinyl chloride, etc. are mentioned, for example. Such a container is generally called a molding. In the present embodiment, the first waterproof member 6a is formed in a container shape having a trapezoidal cross section, but the shape is not particularly limited.

  Further, the second waterproof member 6b is formed so as to straddle the surface of the first waterproof member 6a and the surface of the concrete 10 located outside the first waterproof member 6a. As this 2nd waterproofing member 6b, the resin molding etc. which were formed from resin materials, such as an epoxy, an acryl, ester, are mentioned.

  In addition, the aspect which has covered the whole 1st waterproofing member 6a other than the aspect shown in FIG. 1 where the 2nd waterproofing member 6b covers a part of 1st waterproofing member 6a is employ | adopted. Also good.

  Moreover, each thickness of the 1st waterproof member 6a and the 2nd waterproof member 6b is not specifically limited, What is necessary is just to set suitably so that water may not permeate the inside of the concrete 10. FIG.

  Further, in the present embodiment, a plurality of the metal materials 11 are installed at a distance from each other, and the cathodic protection electrode 1, the fixing portion 4, and the waterproof member 6 correspond to the plurality of metal materials 11. It is preferable that a plurality of waterproof members 6 are arranged and spaced apart from each other.

Here, after the concrete structure 100 is manufactured, a gas such as hydrogen gas may be generated from the inside of the concrete 10. At this time, the waterproof members 6 between the anticorrosive electrodes 1 (waterproof members adjacent to each other). 6), the gas accumulates between the waterproof member 6 and the surface of the concrete 10, and the adhesion of the waterproof member 6 to the surface is reduced. There is a risk of water entering unexpectedly.
However, according to the said structure, since the prevention members 6 are separated, the said gas will be discharge | released to external environment from these clearance gaps. Thereby, since it can suppress that the said gas accumulates between the waterproofing member 6 and the concrete 10 surface, the variation in the moisture content of the concrete 10 which affects a corrosion-proof electric current can be suppressed more.
However, you may employ | adopt the aspect with which waterproof member 6 mutually adjacent | abutted other than this aspect is connected.
In addition, when the waterproofing member 6 is connected in this way, the distance between each anticorrosion electrode 1 and the edge of the fixing portion 4 for the anticorrosion electrode 1 disposed adjacent thereto corresponds to the distance L. To do. That is, the waterproof member 6 positioned between the adjacent fixing portions 4 is shared as the waterproof member 6 for both of the adjacent anticorrosion electrodes 1.

  Then, the manufacturing method of the concrete structure of this embodiment is demonstrated.

  The method for manufacturing the concrete structure 100 is, for example, as follows. That is, first, the anticorrosion electrode 1 is placed on the surface of the concrete 10 in which the metal material 11 is installed. Next, the 1st waterproofing member 6a is distribute | arranged to the concrete 10 surface so that this may be covered from the upper direction of an electrode. Next, a material for forming the fixing portion 4 is injected into a gap between the inner surface of the first waterproof member 6a and the concrete 10 surface, and the material is cured to form the fixing portion 4. And the material for forming the 2nd waterproof member 6b is arranged by application etc. so that the surface of the 1st waterproof member 6a and concrete 10 may be straddled, this is hardened, and the 2nd waterproof member 6b is arranged. Form. At this time, the 2nd waterproof member 6b is formed so that the distance of the edge of the 2nd waterproof member 6b and the anti-corrosion electrode 1 may be 20 mm or more. In this way, the concrete structure 100 is manufactured.

As described above, the concrete structure 100 of the present embodiment is fixed by covering the surface of the concrete 10 on which the metal material 11 is installed with the anticorrosion electrode 1 covered with the fixing portion 4. In order to manufacture 100, it is not necessary to cut the surface of the concrete 10 or make a hole in the surface of the concrete 10.
In addition, the surface of the fixing portion 4 and the surface of the concrete 10 located outside the fixing portion 4 are covered with the waterproof member 6, and the distance between the extended edge of the waterproof member 6 and the anticorrosion electrode Since L is 20 mm or more, it is difficult for water to enter the concrete 10 due to rain or the like, and fluctuations in the water content of the concrete 10 in a region that affects the anticorrosion current can be suppressed. Thereby, the variation in anticorrosion current can be suppressed.
Therefore, the anticorrosion electrode 1 is easily installed, and the concrete structure 100 with relatively little variation in the anticorrosion current is obtained.

In the present embodiment, since the waterproof member 6 includes the first waterproof member 6a and the second waterproof member 6b, the first waterproof member 6a and the second waterproof member 6b are separately provided. It can be formed using a material, or can be formed in a separate process. For example, at the time of manufacture, the shape of the material for forming the solid portion 4 is cured while being held by the first waterproof member 6a as described later, and the position of the extended edge is adjusted by the second prevention member 6b. can do.
In this manner, the first waterproof member 6a and the second waterproof member 6b can be provided with different functions and can share roles. In addition, the anticorrosive electrode 1 is more easily installed, and the concrete structure 100 is further reduced in the variation of the anticorrosion current.

  Next, a concrete structure according to a second embodiment of the present invention will be described with reference to FIG. 4 that are the same as those in FIG. 1 are denoted by the same reference numerals and description thereof will not be repeated.

In the concrete structure 100 of the present embodiment, the fixing portion 4 is not covered with the first waterproofing member 6a that functions as a shape maintaining member.
Moreover, the waterproof member 6 is comprised from the one molded object formed so that the surface of the fixing | fixed part 4 and the outer surface of the said fixing | fixed part 4 in the said concrete 10 might be covered over. As such a waterproof member 6, the resin molding formed from the material similar to the material for forming the 2nd waterproof member 6b mentioned above is mentioned.

Moreover, the fixing | fixed part 4 of this embodiment can be formed by pouring the material for forming the fixing | fixed part 4 into this formwork and hardening it using a not-shown formwork, for example. Moreover, after forming the fixing | fixed part 4, a formwork is removed, Then, the material for forming the waterproof member 6 straddles the whole surface of the fixing | fixed part 4, and the concrete 10 surface located on the outer side of this fixing | fixed part 4. Thus, the waterproofing member 6 can be formed by arranging by application | coating etc. and making it harden | cure. At this time, the waterproof member 6 is formed so that the distance L between the extended edge of the waterproof member 6 and the anticorrosion electrode 1 is 20 mm or more.
In addition, since the structure of the concrete structure 100 of this embodiment and its manufacturing method are the same as that of the said 1st Embodiment, description is not repeated.

  Next, a concrete structure according to a third embodiment of the present invention will be described with reference to FIG. In FIG. 5, parts common to those in FIGS. 1 and 4 are denoted by common reference numerals and description thereof will not be repeated.

  In the present embodiment, as shown in FIG. 5, the anticorrosion electrode 1 is arranged on the concrete 10 having the grooves 9. Moreover, the fixing | fixed part 4 is comprised so that the electrode 10 may be covered and fixed to the concrete 10 surface, filling the groove | channel 9. As shown in FIG. And the fixing | fixed part 9 is formed so that the surface may become flush with the surface of the concrete 10 located in the outer side of the groove part 9. FIG. In the present embodiment, the bottom surface of the groove 9 corresponds to the surface of the concrete 10 on which the anticorrosion electrode is arranged. Moreover, as the groove | channel 9, the thing of width 5-50mm and depth 5-50mm is mentioned, for example.

Moreover, the fixing | fixed part 4 of this embodiment can be formed by pouring the material for forming the fixing | fixed part 4 in the groove | channel 9, and hardening it. Moreover, after forming the fixing | fixed part 4, it distribute | arranges by application | coating etc. so that it may straddle over the whole surface of the fixing | fixed part 4, and the concrete 10 surface located outside this fixing | fixed part 4, and forms the waterproof member 6 can do.
In addition, since the structure of the concrete structure 100 of this embodiment and its manufacturing method are the same as that of the said 1st Embodiment, description is not repeated.

  In addition, although the concrete structure concerning each said embodiment is as above, the concrete structure of this invention is not specifically limited to the said embodiment, In the range which does not deviate from the summary of this invention, it is appropriate. Can be changed. For example, in the third embodiment, the inside of the groove is filled with the fixing portion. In addition, the fixing portion and the waterproof member similar to those in the first and second embodiments are arranged on the bottom surface of the groove. It is also possible to adopt the mode described above.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

(Production Example 1)
-Material used Metal material: Columnar steel material (D13) having a diameter of 13 mm and a length of 300 mm (trade name: deformed steel bar (rebar) D13, manufactured by Chiyoda Steel Co., Ltd.)
Concrete material: Ordinary Portland cement (trade name: Ordinary Portland cement, manufactured by Sumitomo Osaka Cement Co., Ltd.), coarse aggregate, fine aggregate, water Electroprotection electrode: Titanium ribbon mesh # 100, 13 mm x length 400 mm (trade name: Elgard titanium ribbon mesh # 100, manufactured by Sumitomo Osaka Cement Co., Ltd.)
Grout material: Non-shrink mortar “Filcon-R” (manufactured by Sumitomo Osaka Cement)
Mall: Made of vinyl chloride, opening width 27mm x inner height 14mm x inner length 300mm (trade name: wire protector N type, manufactured by Masaru Kogyo)
Resin material: Epoxy resin (trade name: Showbond # 101B, manufactured by Showbond Chemical Co., Ltd.)

-Manufacture of an evaluation sample As shown in Drawing 6, first, concrete which has a metal material inside was formed using a metal material and a concrete material. Specifically, four metal materials are embedded in the interior so that the cover thickness is Tmm at intervals of 100 mm (interval between centers) and parallel to the concrete surface. A rectangular concrete having a length of 400 mm, a width of 300 mm, and a height of 100 mm was formed using a mold.
Next, four electrodes for cathodic protection were placed in parallel with the metal material on the concrete surface located immediately above each metal material. Note that the positions of the four anticorrosion electrodes are referred to as position 1, position 2, position 3, and position 4 in order from those arranged on the left side of FIG.
Next, a molding was applied from above the electrodes, a grout material was injected from a through hole (not shown) formed in the molding, and the injected grout material was cured, thereby forming a grout as a fixing portion. The cross section of the fixed part was trapezoidal in cross section, the upper base of the trapezoid being 18 mm, the lower base 27 mm, and the height 14 mm.
Next, a resin material is used so that the exposed portion of the concrete surface is eliminated except for the outer periphery of the molding at position 3, and only the uppermost surface of the molding at positions 1, 2, and 4 is exposed. Was poured into the concrete surface and cured to form a resin molded body. In FIG. 6, the height of the resin molded body was set to the same height as the uppermost surface of the molding at positions 1, 2, and 4, that is, these uppermost surfaces were exposed from between the resin molded bodies. Moreover, the side surface and bottom surface of concrete are not covered with the resin molding. Further, the interval between the edge of the right side resin molded body at position 2 and the edge of the left side resin molded body at position 4 is set to 100 mm, and the molding at position 3 is formed at the center of these edges. Set to be distributed.
Next, as shown in FIGS. 6 (a) and 6 (b), a resin material is applied and cured so as to straddle the inclined surface (side surface portion) of the molding at position 3 and the concrete surface. A concrete structure was produced by forming At this time, Table 1 shows the distance L and the cover thickness T (mm) between the anticorrosive electrode and the extending end of the resin molded body in the direction perpendicular to the longitudinal direction of the anticorrosive electrode (the left-right direction in FIG. 6). In this way, a test sample was formed.

-Evaluation of test sample As shown in FIG. 6 (c), the test sample formed was applied with a current of 4 mA so that the anticorrosion electrode was a positive electrode and the metal material was a negative electrode, and the current flowing out from each of the anticorrosion electrodes (Anti-corrosion current) was measured. Specifically, the current was measured by placing a 10 Ω cement resistor in series between the anode-side lead wires connecting the anticorrosion electrode and the power source, and measuring the voltages at both ends of the cement resistor. (V = IR). Furthermore, about 100 mL of water is sprayed on the exposed portion of the concrete between the position 2 and the position 3 by spraying, and the exposed portion is sufficiently contained with water. The flowing current was measured. And the ratio of the measured current after spraying water to the measured current before spraying water (measured current after spraying / measured current before spraying when the measured current before spraying is 1.0) is calculated. did. The results are shown in Table 1.

  As shown in Table 1, regardless of the cover thickness T, if the distance L is 20 mm or more, the anti-corrosion variation is reduced, and if the distance L is the cover thickness T or more, the anti-corrosion variation is further reduced. I understood.

(Production Example 2)
-Production of evaluation sample The same metal material, concrete material, electrode for cathodic protection, and resin material as in Production Example 1 were used. On the other hand, the following mortar was used as a material for forming the fixing portion.
Mortar material: Cement mortar "Elgard mortar" (manufactured by Sumitomo Osaka Cement)

As shown in FIG. 7, first, concrete having a metal material therein was formed using a metal material and a concrete material. More specifically, four metal materials are embedded so that the cover thickness is Tmm at intervals of 100 mm (interval between centers) and parallel to the concrete surface. Concrete was formed by using a mold having a convex portion that is formed in a rectangular shape having a length of 400 mm, a width of 300 mm, and a height of 100 mm and having a groove. The grooves were 300 mm long × 25 mm wide × 20 mm deep, with an interval of 100 mm (interval between centers), and were formed in parallel with the metal material. In the same manner as described above, the positions of the four anticorrosive electrodes are referred to as position 1, position 2, position 3, and position 4 in order from the one disposed on the left side of FIG.
Next, an electrode for anticorrosion was placed parallel to the metal material at the center in the width direction at the bottom of each groove.
Next, each groove at positions 1 to 4 was covered with a plasterer using a mortar material so as to fill the groove, and cured to form a fixing portion. The fixing portion was formed so that the upper surface of the fixing portion was flush with the concrete surface where the groove was not formed.
And a resin material is apply | coated so that it may straddle the fixed part whole surface of the position 1-4 and the concrete surface of the outer side of this fixed part, and it hardens | cures by natural drying, and forms a resin molding, and a concrete structure Was made. At this time, similarly to the above, the distance L between the anticorrosive electrode and the extended end of the resin molded body in the direction perpendicular to the longitudinal direction of the anticorrosive electrode (the left-right direction in FIG. 7), and the cover thickness T (mm) Modifications were made as shown in Table 2 to form test samples. In addition, the resin moldings at each position were formed so as to be separated from each other.

-Evaluation of test sample As shown in Fig. 7 (c), for the formed test sample, a current of 4 mA was applied so that the anticorrosion electrode was a positive electrode and the metal material was a negative electrode, and the current flowing out from each of the anticorrosion electrodes (Anti-corrosion current) was measured in the same manner as described above. Further, 100 mL of water is sprayed on the exposed portion of the concrete between the position 2 and the position 3 by spraying, and the exposed portion is sufficiently contained with water. The flowing current was measured. Then, the ratio of the measurement current after spraying water to the measurement current before spraying water (measurement current after spraying / measurement current before spraying when the measurement current before spraying is 1) was calculated. The results are shown in Table 2.

  As shown in Table 2, regardless of the cover thickness T, if the distance L is 20 mm or more, the anti-corrosion variation is reduced, and if the distance L is the cover thickness T or more, the anti-corrosion variation is further reduced. I understood. Further, it was found that when the distance L is equal to or greater than the cover thickness T, the variation in the current can be sufficiently suppressed in the range in which the current flowing between the anticorrosive electrode and the metal material is diffused.

(Production Example 3)
A test sample was formed in the same manner as in Production Example 2 except that the distance between the metal materials was 200 mm and that the distance L (mm) was changed when the cover thickness T was 20 mm.
Then, in the same manner as in Production Example 2, the ratio of the measured current after spraying to before water spraying was calculated. The results are shown in Table 3.

  As shown in Table 3, it was found that even if the distance between the metal materials was changed, the anti-corrosion variation was reduced if the distance L was 20 mm or more.

(Production Example 4)
A test sample was formed in the same manner as in Production Example 2 except that the width of the electrode was set to 20 mm and the distance L (mm) was changed when the cover thickness T was 20 mm.
Then, in the same manner as in Production Example 2, the ratio of the measurement current after water spraying to that before water spraying was calculated. The results are shown in Table 4.

  As shown in Table 4, it was found that even when the width of the anticorrosive electrode was 20 mm, the anticorrosion variation was reduced if the distance L was 20 mm or more.

  As described above, the embodiments and examples of the present invention have been described, but it is also planned from the beginning to appropriately combine the features of the embodiments and examples. The embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the embodiments and examples described above but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

1: Electrocorrosive electrode, 2: Sheet body, 3: Shape retaining member, 4: Fixed part, 6: Waterproof member, 6a: First waterproof member, 6b: Second waterproof member, 10: Concrete, 11: Metal Material, 100: Concrete structure.

Claims (5)

Concrete with metal material installed inside,
An anticorrosion electrode disposed on the surface of the concrete;
A fixing portion containing a cement material and an aggregate, and being fixed to the surface of the concrete while being disposed on the surface of the concrete and covering the cathodic protection electrode;
A waterproof member having waterproofness and being arranged so as to cover the surface of the fixed portion and the surface of the concrete located outside the fixed portion;
The waterproof structure is a concrete structure that extends outward from the edge of the fixed portion, and the distance between the extended edge and the anticorrosion electrode is 20 mm or more.   The concrete structure according to claim 1, wherein the distance is equal to or greater than a cover thickness. The waterproof member has a first waterproof member and a second waterproof member,
The first waterproof member is arranged so as to cover the surface of the fixed part,
The said 2nd waterproof member is distribute | arranged so that at least one part of the surface of the said 1st waterproof member and the surface of the said concrete located in the outer side of the said 1st waterproof member may be covered. 2. The concrete structure according to 2.   The concrete structure according to claim 1, wherein the waterproof member further has insulating properties.   The concrete structure according to claim 1, wherein the fixing portion further contains an electromagnetic wave shielding material.

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