JP2002220686A - Panel with cathodic protection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panel with a cathodic protection function which can prevent corrosion of a steel material in a body structure. SOLUTION: The panel 1 with a cathodic protection function, which is arranged on the surface of the body structure 7, in order to prevent corrosion of the steel material 71 used in the body structure, comprises an anode layer 2, a reinforcement layer 4 arranged on the above anode layer, and protecting layers 3, and is characterized by arranging the above anode layer and the above reinforcement layer between the two sheets of the protecting layers, and by integrating them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel having an anticorrosion function for preventing corrosion of steel materials used for concrete structures and steel structures.

[0002]

2. Description of the Related Art Steel structures, concrete structures, etc. (hereinafter referred to as main structures) deteriorate over time due to various material, structural, and environmental factors. Corrodes and cracks on concrete surface. Therefore, it is necessary to reinforce or repair the main body structure as necessary. 2. Description of the Related Art Conventionally, there is a method of attaching a panel to a surface of a main body structure when reinforcing or repairing the main body structure. In repairing when the structural strength of the main body structure is not reduced, a decorative panel or the like is used for the purpose of protecting the surface of the main body structure and preventing further deterioration and corrosion. In addition, in the case of reinforcement or repair when the structural strength of the main structure is reduced, or in the case of reinforcement for the purpose of improving seismic performance, a reinforcing panel is installed on the surface of the structure. The reinforcing panels used in this case include steel panels and high-strength concrete panels.

[0003]

The above-mentioned conventional panel has the following problems. <B> In the method of attaching a panel to the surface of the main body structure,
It only shuts off water, ultraviolet rays and the like that cause deterioration. That is, since it does not actively prevent corrosion of steel materials and the like, the progress of corrosion may not be suppressed in some cases. <B> When the reinforcing panel is used, the structural strength of the structure can be improved. However, if the progress of corrosion of the reinforcing steel used for the main structure cannot be stopped, the structural strength of the entire structure gradually decreases.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a panel having an anti-corrosion function capable of preventing corrosion of steel of a main structure. It is another object of the present invention to provide a panel having an anticorrosion function capable of simultaneously protecting a steel material of a main body structure and reinforcing the main body structure. It is another object of the present invention to provide a panel with an anticorrosion function that is excellent in workability and hardly deteriorates after construction. The present invention achieves at least one of these objects.

[0005]

In order to achieve the above object, a panel with an anticorrosion function of the present invention is installed on the surface of a main body structure in order to prevent corrosion of steel used for the main body structure. A panel, comprising: an anode layer; and a protective layer for protecting the anode layer. here,
The anode layer refers to a layer that becomes an anode when performing cathodic protection.

Further, the anode layer can be made of a metal having a higher ionization tendency than the steel material. in this case,
The galvanic protection of the galvanic anode system described below can be performed. Here, a metal having a higher ionization tendency than steel is
Zinc, magnesium, aluminum and their alloys.

Further, the panel with an anticorrosion function of the present invention comprises:
A panel installed on the surface of a main body structure to prevent corrosion of a steel material used for the main body structure, comprising: an anode layer; a reinforcing layer disposed so as to overlap the anode layer; and a flexible board. Wherein said anode layer and said reinforcing layer are arranged and integrated between said flexible boards. Here, the reinforcing layer is disposed to increase the strength of the panel, and a carbon fiber sheet or the like can be used.
In addition, a flexible board can be used as the protective layer of the invention.

[0008] An intermediate board may be interposed between the anode layer and the reinforcing layer. A flexible board or the like can be used as the intermediate board.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

<A> Cathodic Protection In the present invention, the principle of the cathodic protection method is applied. The cathodic protection method is a method of preventing corrosion of a steel material by flowing an electric current from the surface of the structure to a steel material inside the structure. There are two types of cathodic protection methods, the galvanic anode method and the external power supply method. The galvanic anode method uses a potential difference between different metals to flow an anticorrosion current, and uses zinc, magnesium, aluminum, or an alloy thereof as an anode. By connecting a steel material to a metal having a higher ionization tendency than iron, the metal becomes an ion, and electricity flows using the steel material as a cathode. In this method, the metal serving as the anode is gradually consumed. In the external power supply method, commercial power is transformed and rectified, and a corrosion prevention current is forced to flow using steel as a cathode. An insoluble anode such as titanium or graphite is used as the anode. In this method, the metal serving as the anode is not consumed, so that it can be used permanently. Due to the electrolytic protection, the steel 71 of the main structure 7 is electrochemically inactivated, and the corrosion of the steel 71 can be prevented.

<B> Panel The panel 1 comprises a protective layer 3 and an anode layer 2. If necessary, the anode layer 2 may be formed by sandwiching the two protective layers 3. In this case, the material of the protective layer 3 may be different between the upper layer and the lower layer. Further, a reinforcing layer 4 can be provided between the anode layer 2 and the protective layer 3. In this case, panel 1
Can be used for reinforcing the main body structure 1.

<C> Anode Layer The anode layer 2 is a layer made of a material that becomes an anode when performing electrolytic protection. When the electrolytic protection is performed by the above-described galvanic anode method, the anode layer 2 is formed using zinc, magnesium, aluminum, or an alloy thereof. For example, a zinc sheet, an aluminum sheet, a zinc spray coating and the like can be used. Further, in the case where the electrolytic protection is performed by an external power supply system, the anode layer 2 is formed by using an insoluble anode such as titanium or graphite. For example, a mesh-shaped titanium mesh (see anode layer 2 in FIG. 1), grid anode layer 2a in which titanium plates are arranged in parallel at intervals and connected by current distribution material 6
(Refer to FIG. 3), a member composed of a platinum titanium wire and a conductive coating film (not shown) or the like can be used.

<D> Protective Layer The protective layer 3 is a layer for protecting the anode layer 2. When only one protective layer 3 is used, it is used so as to be disposed on the side opposite to the main body structure 7. When the purpose of use of the panel 1 is not to reinforce the main body structure 7, a material used as a known decorative board such as a concrete board can be applied to the protective layer 3.

When the protective layer 3 is expected to have high strength, a high-strength flexible board 3a can be used. The high-strength flexible board 3a contains cement, calcium silicate, and organic fibers (pulp) as main components, and after kneading them, is formed into a roll and dewatered and pressed. Known products can be used for the high-strength flexible board 3a.
It is a product of the standard of mm to 6 mm. The high-strength flexible board 3a can be easily manufactured in a factory, has stable product quality, and has a bending strength of 30 (N / mm ² ).
As described above, there are advantages in terms of durability, such as no cracks on the surface and nonflammability. Furthermore, it can be easily bent and formed into a desired shape according to the shape of the main body structure 7 to be reinforced, and the specific gravity is as light as 1.6 to 1.8, so that the workability and transportability can be improved. There are also advantages in terms of workability, such as ease of installation.

The protective layer 3 can be formed by using known fiber reinforced concrete or high-strength concrete. When a plurality of protective layers 3 are provided on the panel 1, different materials can be used for each.

<E> Reinforcing Layer The reinforcing layer 4 is a layer made of a sheet-like, plate-like or linear material arranged to increase the strength of the panel 1. For example,
Carbon fiber sheet 4a, aramid fiber sheet, glass fiber sheet, vinylon fiber sheet and the like can be used. Here, the carbon fiber sheet 4a is lightweight, having a specific gravity of 1.7 to 1.8, and has a property of not rusting. In the fiber direction, 3000 (N / mm ² ) which is about 5 to 6 times that of a reinforcing bar. It has a large tensile strength. Therefore, by arranging the carbon fiber sheet 4a between the high-strength flexible boards 3a, a structural strength equal to or higher than that of reinforced concrete can be obtained with a thin film. This carbon fiber sheet 4a
A known single-oriented sheet, one obtained by alternately stacking single-oriented sheets like plywood, a cloth-like sheet, or the like can be used. Depending on the required strength, the carbon fiber sheet 4a
The weight per unit area can be freely selected. It is preferable to use the carbon fiber sheet 4a impregnated with an epoxy resin. Further, a carbon fiber sheet (prepreg) pre-impregnated with an epoxy resin can also be used.

<F> Intermediate Board The intermediate board 31 is a plate material interposed between the anode layer 2 and the reinforcing layer 4 as necessary. The same material as the above-described protective layer 3 can be used. The effect of the anode layer 2 can be expected to be further improved by interposing the intermediate board 31.

<G> Adhesive The adhesive (51, 52) is a material which can be integrally formed by firmly joining the protective layer 3, the anode layer 2, and the reinforcing layer 4 arranged as required. Any type may be used, but an epoxy resin is preferred from the viewpoint of adhesive strength and workability. As the other adhesives (51, 52), resin adhesives such as vinyl acetate resin, EVA (ethylene-vinyl acetate copolymer resin), and acrylic resin,
It is also possible to use a rubber-based adhesive such as a chloroprene rubber-based or styrene-butadiene rubber-based, or a water / air-hardened adhesive such as a cement-based or gypsum-based.

The method of using the present invention will be described below with reference to FIG.

<A> Installation of Panel (See FIG. 4) For example, a case where the panel 1 is installed on the surface of the main structure 7 having a concrete structure will be described. The panel 1 is installed at a distance of, for example, 10 mm to 15 mm from the surface of the main body structure 7. Then, the gap between the main body structure 7 and the panel 1 is filled with the bonding material 8 to integrate them. Here, the bonding material 8 includes high-strength non-shrink mortar, epoxy resin, E
It is possible to use a bonding material such as a VA, a polymer resin, a vinyl acetate resin, a rubber latex, an acrylic emulsion, a recycled rubber, or a silicone. In addition,
The panel 1 may be attached after applying the bonding material 8 to the surface of the main body structure 7 or the panel 1 in advance. Further, even when the main body structure 7 is newly provided, the panel 1 of the present invention can be used as a buried mold.

<B> Galvanic anode system (see FIG. 4A) When the galvanic anode system is adopted, the steel material 7 of the main body structure 7 is used.
1 and the anode layer 2 are connected by a conducting wire 91 or the like. The galvanic anode system does not require the use of a power supply because it utilizes the potential difference between different metals. In this case, since a metal having a higher ionization tendency than a steel material is used for the anode layer 2, the steel material 71 serves as a cathode and the anode layer 2 serves as an anode. In the middle of the conducting wire 91,
A monitoring device may be installed.

<C> External power supply system (see FIG. 4B) When the external power supply system is adopted, the (+)
The anode layer 2 is connected to the side, and the steel material 71 of the main body structure 7 is connected to the (−) side, and a predetermined current flows. In this case, since the anode layer 2 is not consumed, it can be used for a long time.

[0023]

As described above, the panel with an anticorrosion function of the present invention has the following effects. <A> The panel of the present invention has an anticorrosion function. For this reason, by attaching panels to the surface of the main structure, it is possible to not only shut off external air, water, ultraviolet rays, etc. that cause deterioration, but also to inactively corrode the steel material of the main structure. Can be prevented. <B> When a reinforcing layer is provided on the panel or when the protective layer is formed of a high-strength material, the panel also functions as a reinforcing panel. As a result, the corrosion prevention of the steel material of the main body structure and the reinforcement of the main body structure can be simultaneously performed by one panel. <C> A panel comprising an anode layer and a protective layer. Therefore, the installation of the anode layer for cathodic protection and the repair or reinforcement of the main body structure are completed simply by attaching the panel, which is simple. Further, since the protective layer also covers the surface of the main body structure, deterioration of the main body structure can be prevented. <D> When the cathodic protection is performed by the galvanic anode method, the anode layer is consumed over time. However, the panels of the present invention are interchangeable.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a panel with a cathodic protection function of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of a panel with a cathodic protection function when an intermediate board is used.

FIG. 3 is a perspective view of an embodiment when a grid anode layer is used.

FIG. 4 is an explanatory diagram of a method of using the present invention. (A) Galvanic anode system. (B) External power supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Anode layer 3 ... Protective layer 3a ... Flexible board 31 ... Intermediate board 4 ... Reinforcement layer 4a ... Carbon fiber sheet 7 ... Main body structure 71 ... Steel material

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) E04C 2/26 E04C 2/26 W (72) Inventor Sakamoto Zenfu 2-chome Kabukicho, Shinjuku-ku, Tokyo No. 9 Within Civil Renewal Co., Ltd. (72) Nakano Sada Inventor F-term (reference) 2E162 CA03 CA11 CA12 CA33 CA38 CB02 CD16 EA00 4K060 AA02 AA03 BA02 BA08 BA13 BA34 CA06 EA08 EB01 FA03 4K062 AA05 CA10 EA20 FA08 FA12 GA01

Claims (4)

[Claims] 1. A panel installed on a surface of a main body structure to prevent corrosion of a steel material used for the main body structure, comprising: an anode layer; and a protective layer for protecting the anode layer.
Panel with cathodic protection function. 2. The panel with an anticorrosion function according to claim 1, wherein the anode layer is made of a metal having a higher ionization tendency than the steel material. 3. A panel installed on a surface of a main body structure to prevent corrosion of a steel material used for the main body structure, comprising: an anode layer; a reinforcing layer arranged so as to overlap the anode layer; a flexible board; A panel with an anticorrosion function, wherein the anode layer and the reinforcing layer are arranged and integrated between two flexible boards. 4. The panel with an anticorrosion function according to claim 3, wherein an intermediate board is interposed between the anode layer and the reinforcing layer.