JP2002371390A - Method for installing electrode for cathodic protection of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and economical method for installing an electrode for cathodic protection of a concrete structure. SOLUTION: The method for installing an electrode for cathodic protection of the concrete structure is characterized by attaching a channel-forming material on a repairing formwork for the concrete at the contact side with the concrete, so as to form a channel in the concrete, removing both the formwork and the channel-forming material, and arranging the electrode for cathodic protection in the bottom of the formed channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a cathodic protection electrode on a concrete structure.

[0002]

2. Description of the Related Art
As a method of electrolytic protection of steel in a concrete structure,
There are an external power supply system and a galvanic anode system.

[0003] In the external power supply system, an insoluble anode is arranged on a concrete surface, an anode (electrode) for cathodic protection is obtained from a DC power supply, and a direct current (20 V or less) is applied to steel materials such as reinforcing bars embedded in the concrete. It is something to shed.

The material of the insoluble anode (electrode) used here is titanium or the like. In addition, insoluble anode (electrode)
There are a planar shape, a band shape, a linear shape, and the like, and a band electrode is generally used.

Conventionally, when installing the above-mentioned strip-shaped electrode,
The fragile part where the concrete structure was damaged was removed and installed after the cross section was restored.

[0006] As a method of repairing the cross section, specifically, when the damage is slight, the cross section is repaired only by ironing,
In the case of large-scale repairs that are severely damaged, repair the cross section by removing the damaged part → setting the formwork → placing concrete → removing the formwork.

[0007] As a method for installing the electrodes, a method shown in Fig. 4 after the restoration of the section of the concrete structure is employed.

That is, FIG. 4 is a cross-sectional view for explaining the steps of a conventional method for installing a cathodic protection electrode on a concrete structure.

In FIG. 4, after repairing the cross section of the concrete structure, the concrete structure 3 is grooved with a cutter in accordance with the installation position of the electrode, and a hanger 8 is provided with a chipper or the like. . Hanging part 8
Since the bottom surface has irregularities, it is necessary to lay a smoothing material 9 such as mortar on the bottom surface for smoothing. And smoothing material 9
The band-shaped electrode 1 is fixed to the bottom surface of the hanging portion 8 smoothed by the fixing pin 2 such as a plastic pin.

[0010] However, such an installation method requires formation of a hanging portion and laying of a smoothing material, which is very troublesome and is not economically preferable.

Accordingly, an object of the present invention is to provide a simple and economical method of installing an electrode for cathodic protection on a concrete structure.

[0012]

As a result of the study, the present inventors have found that by attaching a groove forming material to the concrete repair formwork on the side in contact with the concrete so that a groove is formed in the concrete. It was found that the purpose could be achieved.

The present invention has been made on the basis of the above-mentioned findings. A groove forming material is attached to a side of a concrete repair formwork in contact with concrete so that a groove is formed in concrete, and the groove is formed together with the formwork. It is an object of the present invention to provide a method for installing an electrode for preventing corrosion on a concrete structure, wherein the electrode for preventing corrosion is installed on the bottom surface of a formed groove after removing a forming material.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for installing a cathodic protection electrode on a concrete structure according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view for explaining the steps of the method for installing a cathodic protection electrode on a concrete structure according to the present invention. In FIG. 1, 1 is a strip electrode, 2 is a fixing pin, 3 is a concrete structure, 4 is a steel material (rebar), 5 is a concrete repairing formwork, 6 is a groove forming material, and 7 is a groove.

In FIG. 1, a concrete repair form 5
The groove forming material 6 is attached to the side in contact with the concrete, that is, to the concrete structure 3 side. The groove forming material 6 is made of a foaming material such as styrene foam or urethane foam, wood, clay, or the like. The shape is not particularly limited, but it is necessary that at least the bottom surface be smooth, and a square shape is generally used. is there.

In the present invention, as shown in FIG. 1, the groove 7 formed after removing the groove forming material 6 together with the mold 5 is formed.
A band electrode 1 is fixed to a bottom surface of a fixing pin 2 such as a plastic pin.
Fix and install.

FIG. 2 is a plan view showing an example of fixing the strip-shaped electrode 1 with the fixing pins 2, and FIG. 3 is a side view thereof. In FIGS. 1 and 2, the strip-shaped electrode 1 is laid on the bottom surface of the groove 7 and both sides of the strip-shaped electrode 1 are alternately fixed with the fixing pins 2, so that the strip-shaped electrode 1 can be easily fixed.

As described above, FIG. 1 shows an embodiment in which the strip-shaped electrode 1 is fixed and fixed by the fixing pins 2, but a planar or linear electrode may be used as the electrode for cathodic protection. Also,
The means for installing the electrodes is not particularly limited.

A preferred example of the electrode used in the present invention is a flexible mesh strip electrode obtained by processing high-purity titanium into an expanded metal ribbon shape and baking and coating a platinum-based oxide. . When such a strip-shaped electrode is used, for example, a groove having a width of 25 mm and a depth of 20 mm, and a strip-shaped electrode having a width of 13 mm is installed on the concrete structure at 200 mm intervals, thereby achieving good corrosion protection of the concrete structure. it can.

After the band-shaped electrode 1 is installed on the bottom surface of the groove 6, the groove 6 is filled with a filler such as mortar.

[0022]

According to the method for installing an electrode for cathodic protection of a concrete structure according to the present invention, since it is not necessary to form a hanging portion or lay a smoothing material, the number of steps is greatly reduced, and the method is simple and economical. The installation method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining steps of a method for installing a cathodic protection electrode on a concrete structure according to the present invention.

FIG. 2 is a plan view showing an example of fixing a strip electrode with a fixing pin.

FIG. 3 is a side view showing an example of fixing a strip electrode with a fixing pin.

FIG. 4 is a cross-sectional view illustrating a process of a conventional method for installing a cathodic protection electrode on a concrete structure.

[Explanation of symbols]

 1: Strip electrode 2: Fixing pin 3: Concrete structure 4: Steel material (rebar) 5: Concrete repair form 6: Groove forming material 7: Groove portion 8: Hanging portion 9: Smooth material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keiji Imamura 3-18 Kanda Nishiki-cho, Chiyoda-ku, Tokyo Showcase Construction Co., Ltd. (72) Inventor Kazuyuki Wakana 3-18 Kanda-Nishiki-cho, Chiyoda-ku, Tokyo Showborn Construction Shares In-house (72) Inventor Takumi Yamagata 3-18 Kanda Nishiki-cho, Chiyoda-ku, Tokyo F-term (reference) 4K060 AA03 BA16 BA17 BA41 BA43

Claims (3)

[Claims] 1. A groove forming material is attached to the concrete repairing formwork on the side in contact with the concrete so as to form a groove in the concrete, and after removing the groove forming material together with the formwork, the groove formed is removed. A method for installing a cathodic protection electrode on a concrete structure, wherein a cathodic protection electrode is provided on a bottom surface. 2. The method according to claim 1, wherein the electrode is a strip-shaped electrode, and is fixedly installed with a fixing pin. 3. The method according to claim 1, wherein the groove forming material is a foam material, wood, or clay.