JPH0827828A - Antifouling coating method for concrete structures - Google Patents

Abstract

PURPOSE:To prevent the adherence of marine creatures to a concrete structure by mounting a guide frame to the surface of the concrete structure with which sea water is brought into contact, and stretching a laminated antifouling panel applying antifouling paint to the surface through the guide frame. CONSTITUTION:A guide frame 6 of FRP or engineering plastics is mounted to the surface of a concrete structure constructed in a seawater environmental zone brought into contact with seawater with an anchor bolt 7 and is fixed. A material selected from rigid FRP, engineering plastics, aluminum alloy or steel is used as a basic material 3, a laminated antifouling panel 1 of laminated construction providing a cushion material 5 on the rear side is provided. An antifouling paint 2 is applied to the surface of the antifouling panel 1, and the antifouling panel is stretched to the concrete structure through the guide frame 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete structure used in seawater, for example, a surface or wall surface (hereinafter collectively referred to as surface) of an intake channel, a screen room, a pump room, an abutment, a bridge, etc. The present invention relates to prevention of adhesion of marine life by antifouling paint, and more particularly to a method of applying antifouling paint on the surface of the structure.

[0002]

2. Description of the Related Art Antifouling paints have been widely used to prevent the adhesion of marine organisms that grow and grow on the surface of concrete structures used in seawater.

The construction of applying an antifouling paint to the surface of a concrete structure is usually carried out when the periodic inspection is released, that is, when the water in the facility is drained and emptied. However, the environment inside the facility is extremely bad (dirt, foul odor, salt content, humidity, temperature, etc. due to the adhesion of various marine organisms), and it is not possible to start the painting work immediately after draining, and many Preparatory work is required.

Considering the coating procedure on the wall surface of the intake channel when used in the silicone resin type antifouling paint which is currently in high demand as a pollution-free antifouling paint,
(1) Surface cleaning of concrete structures (removal of sea life,
(2) Surface preparation of concrete structure (cleaning, desalting, drying, etc.), (3) Surface preparation of concrete structure (primer, epoxy resin, primer, vinyl resin coating) ), And (4) application of the antifouling paint (3 to 4 times application) is the standard order. In order to fully demonstrate the performance of the finished coating film, it is necessary to form a uniform and uniform coating film on the surface of the structure. Techniques and construction capacity suitable for painting work, environment and sufficient construction work are required. It is important to secure a period.

Among the above-mentioned standard processes, (1) and (2) have a great influence on the life of the finished coating film even if they are not directly related to the coating work, and are inevitable as a pretreatment work for the coating. (3) and (4) are the direct painting work itself. At least 7 to 8 times of coating work are required to complete the antifouling coating film, and one week is required to complete the direct coating work.

The optimization of the work environment for all painting work is
It is important to secure physical and human resources, but the finish of the coating film is affected by temperature and humidity, and it is often required to complete it within a limited construction period. In reality, it is impossible to secure the ideal working conditions required. In many cases, the painting work suffers from weather and humidity, which can affect the performance of the finished coating.
Moreover, the current effect of applying the antifouling paint is about 2 years of life, and it will be necessary to repaint it several years later.

It is easily inferred that the work management can be facilitated and the work cost and the work period can be reduced by reducing the on-site painting work and auxiliary work that affect the quality and performance of the antifouling coating film.

Underwater coating type paints and fillers are being developed, but at present, epoxy resin type fillers are only on the market, and the paints are economical, reliable or workable. The actual situation is that it has not reached the practical range, and antifouling paints have not yet been put to practical use.

A panel coated with a conductive paint is attached to the surface of a concrete structure and connected to the positive electrode of an external DC power source,
A device for applying an antifouling effect by energizing the coated surface as an anode (JP-A-3-169905), or a method of attaching a sheet coated with an antifouling paint to an underwater steel structure using a magnet-containing adhesive No. 4-17137,
JP-A-4-45616) is also proposed.

However, in the conductive paint coating panel disclosed in Japanese Patent Laid-Open No. 169905/1993, the paint itself does not have antifouling property, and the conductor is mainly composed of a carbon-based pigment and is used as an anode by electrolysis by direct current. It is a paint that works. This is an antifouling method in which seawater is electrolyzed with a direct current to generate chlorine or hypochlorous acid, and marine organisms are killed by their toxic ions. Therefore, it is not necessary to stretch the panel electrode around the entire surface of the target concrete structure,
It is necessary to install auxiliary equipment such as a DC power supply, a conductor circuit and a counter electrode (cathode), and the operation management of the device is complicated. However, since it is an antifouling effect due to toxic ions after all, a great deal of effort is spent on secondary environmental pollution and continuous operation management regardless of the antifouling effect. Panels coated with conductive paint are attached to the surface of the target concrete structure with adhesive or plastic bolts, but the selection of adhesive, durability, ease of replacement, or smoothness of the concrete structure surface There are still problems that must be solved in practical use such as compatibility with the degree. In particular, one of the important factors for practical use is to make the panel conform to the surface irregularities of the concrete structure, and how to arrange and install it smoothly.

A sheet coated with an antifouling paint (a magnet-containing adhesive is coated on the back surface) has also been introduced, but it was developed for construction on the surface of an underwater steel structure by underwater work. However, there is poor followability between the flexibility of the sheet and the flexibility of the cured coating film, and if the folding work is repeated during transportation and handling, the adhesion between the sheet and the coating film may deteriorate and the coating film may peel off. Connect In particular, when a sheet is attached to the surface of a steel structure during underwater work, the workability is affected by water resistance, waves, tidal currents, or the surface shape of the structure. It is extremely difficult, and it is virtually impossible to finish the surface uniformly and smoothly according to the surface shape and unevenness of the structure.

The subject of the present invention is a concrete structure. The method of directly applying the antifouling paint to the surface of the concrete structure has major problems before the complexity of the painting work process and the strictness of the construction management described above. Most of the antifouling paints currently used are those developed for steel structures, such as outer plates of ships, and are premised to be overcoated with a rust preventive paint. Antifouling paints for concrete structures have not been put into practical use at present. Therefore, in order to apply the antifouling paint to the surface of the concrete structure, a primer for concrete is applied after the surface treatment, and then an epoxy resin-based paint as a base is applied on top of it, and it is well compatible with the antifouling paint. The complicated work that requires extremely time and effort such as applying antifouling paint (for steel) after applying the vinyl resin type paint is performed. Therefore, the early appearance of antifouling paints for concrete structures is desired.

No antifouling paint for the purpose of antifouling concrete structures in water is currently on the market, so an antifouling paint should be applied to concrete structures such as intake channels, screen rooms, pump rooms, piers and abutments. When applying, there is no choice but to use an antifouling paint for steel structures as described above.

The performance of the coating film depends on the performance of the coating material and the quality of the construction management, but the construction management is substantially dominant. The structure to be painted is always exposed to the marine environment during construction, and the weather and temperature / humidity must be taken into consideration in a severe environment.In addition, the removal of marine organisms adhering to the surface and the groundwork for cleaning. Work and incidental work such as safety measures,
Painting work must proceed under many constraints such as construction schedule.

Under such environmental conditions, it must be said that it is extremely difficult to carry out construction management for surely performing standard work within a limited budget and date and time. Even if the coating work is completed by overcoming these conditions, if the effect of the antifouling paint disappears in about two years, it will be necessary to repeat the work in two years, and the work will be repeated in the same cycle thereafter. Although it is an unavoidable task to ensure that the facility operates soundly and safely during its operation, it is inefficient and economically demanding.

Unlike the coating for the purpose of rust prevention, the antifouling coating does not need to completely shield the surface of the object to be directly protected from the corrosive environment of the surrounding, but to exist near the surface of the object. Since the function can be exerted also by the above, the purpose can be achieved also by applying the antifouling paint to the sheet or board in advance and installing it on the surface of the target structure. It is disclosed that a sheet or board is attached to an object by means of an adhesive, a magnet, a bolt or the like. However, the following problems hinder practical use.

(1) Problems of the sheet construction method a) It is difficult to handle during transportation and construction because it deforms (is flexible). b) It is difficult to secure the accuracy of embedding the surface fixing bolts and magnets of the concrete structure. c) It is difficult to eliminate the effects (deformation) of water pressure, waves and tidal currents. d) It is difficult to securely fix the flutter due to the tidal current at the edges and corners and to prevent separation. e) If there is a gap between the sheet and the object, marine organisms will grow and grow and cause the sheet to peel off.

(2) Problems of board construction method a) It is necessary to install a large amount of fixing bolts for fixing. b) It is difficult to secure the installation accuracy of the fixing studs. c) If the surface of the concrete structure has irregularities, it is smooth and difficult to install reliably. d) If the surface of the object is uneven, it is difficult to connect the boards to each other. e) Surface irregularities on the object cause peeling of the coating film and flapping or peeling of the board. f) Difficult fixing due to tidal currents at edges and corners and for preventing peeling is difficult. g) If there is a gap between the target object and marine life, it will grow and grow, which will cause the board to peel off.

Although both construction methods allow a test facility or a small-scale test construction, the above problems have not been completely solved, so that it is extremely difficult to apply it to a practical facility and almost no examples of use have been found.

The method of directly applying the antifouling paint to the surface of the concrete structure is, in terms of practical use, the finish of the paint film,
Strict construction management is required from the viewpoint of quality performance, and there is also a deadline restriction from the viewpoint of process management. Unless the management of both is simplified, the cost is low and the workers are not secured due to the so-called 3K work that is tough, dirty, and dangerous, and there is no end to the progress of the work.

Although it has been proposed to use a sheet or board coated with an antifouling paint, sufficient consideration has not been given to the base material of the sheet or board, and the above-mentioned problems remain and the area of testing and development is under development. Not out.

[0022]

DISCLOSURE OF THE INVENTION The present invention solves these problems of the prior art and prevents the marine organisms from adhering to the surface of a concrete structure by using an antifouling paint. Another object of the present invention is to provide an antifouling coating method for concrete structures, which enables safe construction and reduction of process time.

[0023]

[Means for Solving the Problems] If it is possible to eliminate the work of directly applying the antifouling paint to the surface of the concrete structure, it is possible to omit various preparatory works required before the painting work is performed, and It can be shortened easily and complicated process control can be greatly reduced. As a means for this, a panel coated with antifouling paint was manufactured at a factory with separate quality control and painting process control, and as a result of examining the construction method to attach this panel very close to the surface of the target concrete structure, Invented.

That is, according to the present invention, a guide frame is attached to the surface of a target concrete structure which is in contact with seawater in order to prevent marine life from adhering to an antifouling paint on the concrete structure constructed in a seawater environment. It is an antifouling coating method for concrete structures, which is characterized in that panels coated with antifouling paint are stretched through a frame.

The characteristic feature of the antifouling coating method of the present invention is how the panel is made to follow the irregularities of the surface of the concrete structure to form a uniform surface without protrusions.

The board as the substrate may be made of metal or non-metal. The laminated antifouling panel used in the method of the present invention has a sectional structure shown in FIG. In the figure, 1 is a laminated antifouling panel, 2 is an antifouling coating, 3 is a base material, 4 is an adhesive, and 5 is a cushion material. Further, in the following drawings, the same reference numerals indicate the same things.

The base material 3 of the laminated antifouling panel 1 is made of rigid FRP or polyacetal (POM), polyamide imide (PAI), polycarbonate (PC), and engineering plastic represented by polyethylene terephthalate (PET). Alternatively, an aluminum alloy containing a small amount of one or more of Mg, Mn, and Si (JIS H 4000 No. 3000, 5000
No., 6000 series alloys) and steel can be used, but plastic is better than metal in consideration of measures against corrosion by seawater. The back surface of the base material 3 is a foamed plastic having a thickness of about 10 to 20 mm, such as 10
It is lined with an elastic cushion material 5 adhesive 4 made of double-expanded polyethylene or the like. by this,
The unevenness of the surface of the structure can be absorbed to bring the laminated antifouling panel 1 into close contact with the surface of the structure, and a uniform and smooth surface can be secured. A predetermined antifouling paint is applied to the surface of the laminated panel including the base material 3 and the cushion material 5. Antifouling coating 2
Is not an on-site work that depends on the weather, the skill of the worker, or the construction period, but is completed in a separate factory under the control of the painting process based on the guidelines of the antifouling paint manufacturer. Therefore, the finished laminated antifouling panel 1 can fully exhibit the performance of the antifouling paint. Moreover, the antifouling coating method of the present invention is shorter in coating process than the method of directly applying antifouling coating to the surface of the target concrete structure by using the laminated antifouling panel, the need for management of coating environmental conditions and the skill of a coating technician. There is a merit that it is not necessary to secure

Next, how to efficiently and surely fix the laminated antifouling panel to the surface of the target concrete structure. After conducting various studies, we decided to adopt a sliding system, which is a formwork system for opening and closing windows and doors related to fittings.

That is, a guide frame having a T-shaped cross section is fixed to the surface of the target concrete structure with anchor bolts before the panel is attached. The guide frame determines the use length, quantity, or mounting position depending on the shape, size, area, submersion depth, tidal current or size and quantity of panels of the target structure. The basic mounting is shown in FIG. The laminated antifouling panel 1 is a laminate including an antifouling coating surface 2 (facing the seawater side), a base material 3 (FRP, engineering plastic, etc.), and a cushion material 5. T
Insert the panel 1 into the gap (sleeve) between the guide frame 6 made of FRP or engineering plastic having a cross section and the surface of the concrete structure,
Tighten and fix with the anchor bolts 7 previously attached to the guide frame 6. Since the tightening nut portion of the anchor bolt 7 projects and is exposed on the sea side, a plastic bolt cap 8 is covered to protect it. The standard size of the laminated antifouling panel 1 is an aspect ratio of 3: 6 (914 W × 1829 Lmm), but it goes without saying that various sizes may be used depending on the structure of the object and the ease of handling. The panel 1 is supported and fixed by being inserted into the sleeve portion of the guide frame 7, but in order to secure the fixing more securely, several points on the surface of the panel 1 are anchor bolts 71 ( (See FIGS. 3 and 5 to be described later) and the bolt cap 8 may be used for fixing. Further, the surfaces of the guide frame 6 and the bolt cap 8 may be subjected to antifouling coating in advance, but the coating surface may be damaged during mounting, so touch-up coating 9 is preferable.

The basic procedure of the antifouling coating method of the present invention can be summarized as follows: (1) The size and number of the laminated antifouling panels 1 are determined according to the structure and area of the target concrete structure. The laminated antifouling panel 1 is manufactured separately in a factory. (2) The FRP guide frame 6 is installed on the surface of the structure. (3) Insert both ends of the laminated antifouling panel 1 into the sleeves of the guide frame 6 and pull them into a predetermined position. (4) Tighten the anchor bolts 7 attached to the guide frame 6 to support and fix the laminated antifouling panel 1. (5) Separate the anchor bolts 7 on the surface of the laminated antifouling panel 1.
Use 1 to tighten and fix. (6) A touch-up coating 9 of antifouling paint is applied to the tightening portion protecting caps 8 of the anchor bolts 7 and 71 and the portion of the guide frame 6 that comes into contact with seawater.

[0031]

EXAMPLES The construction method of the present invention will be specifically described below based on examples.

Embodiment 1 FIGS. 3 to 4 show a front view and a part of a sectional view in which the antifouling coating method of the present invention is applied to a parapet portion (tidal zone) of a steel sheet pile revetment. In the figure, 10 is a steel sheet pile, 11
Indicates the parapet part.

The construction outline is as follows. a) Antifouling target area: approx. 50 m ² (height 1.0 m, extension 50 m) b) Number of laminated antifouling panels used: 17 sheets (900w x 36)
00Lmm = 3m ² / sheet) c) Number of guide frames used …… 18 (100w × 12)
00Lmm) d) Number of anchor bolts used …… 54

Conventionally, antifouling coating is not possible on the parapet part 11 where dryness and humidity repeats depending on the tide level, and the adhesion of marine organisms by the paint is not performed.

The parapet portion of the revetment has good concrete pouring condition and high smoothness, and the antifouling coating method of the present invention is adopted. The laminated antifouling panel 1 and the guide frame 6 manufactured at the factory were brought to the site. The laminated antifouling panel and the guide frame were subjected to the following procedure on the target parapet part.

Construction of work scaffolding, surveying, marking out, embedding anchor bolts, mounting guide frame,
Installation of laminated antifouling panels, fastening of fixing bolts, completion inspection, delivery.

For the construction, the FRP guide frame 6 is vertically attached to the parapet part from which sea life is removed, and the laminated antifouling panel 1 is inserted into both sleeves of the guide frame 6 from above and tightened with anchor bolts 7. Fixed The laminated antifouling panel 1 was reinforced with embedded anchor bolts 71 to withstand the impact of wind and rain and waves. The target revetment parapet department is
Since it is located in the tidal zone and cannot be touch-up painted, the surfaces of the guide frame 6, the anchor bolts 7 and 71, and the protective cap 8 (mainly made of FRP) that come into contact with seawater were painted with antifouling paint in advance at the factory. I used one. The work after loading the laminated antifouling panel 1 and the guide frame 6 to the site was completed in 3 days. Compared with the conventional painting work on the vertical part of the ocean offshore (not necessarily antifouling coating), the construction period is significantly shortened, and the antifouling coating method of the present invention has excellent workability, and It turned out to be highly economical.

The parapet portion of the concrete revetment has been conventionally unpaintable, and virtually no antifouling coating has been implemented as a measure for preventing adhesion of marine life. The antifouling coating method of the present invention is an extremely excellent technique as a means for solving such a point.

With respect to the antifouling effect in this embodiment, since the coating control of the antifouling paint was carried out thoroughly, the results as instructed by the antifouling paint maker could be obtained.

Embodiment 2 FIGS. 5 to 6 are a perspective view and a front view in which the antifouling coating method of the present invention is applied to the wall surface of an open channel type intake channel. In the figure, 12
Indicates a wall surface (side wall), and 13 indicates a bottom surface.

A) Antifouling target area: approx. 100 m ² (height 4.5 m, length 11 m × 2 surfaces) b) Number of laminated antifouling panels used: 72 sheets (900 w × 18)
00Lmm = 1.5m ² / sheet) c) Number of guide frames used …… 14 (100w × 30)
00Lmm) d) Number of anchor bolts used …… 120

The inside of the intake channel is regularly checked to remove marine life,
It was clean and dry. The construction outline is as follows.

Work scaffold loading, assembly, surveying, marking, anchor bolt embedding, guide frame mounting, laminated antifouling panel installation, fixing bolt fastening, guide frame and bolt cap outer surface touch-up painting, completion inspection , Delivery, dismantling of scaffolding, removal.

The coating work on site is only touch-up. The antifouling coating required to prevent the adhesion of marine organisms is formed by installing a separately manufactured laminated antifouling panel at the factory, which significantly reduces the amount of work on site that was required for conventional painting work. , Qualitatively homogeneous and stable are provided. In particular, the unevenness of the finished quality due to the work environment, the weather conditions, the skill gap of the workers, etc., is eliminated.

For the construction, the guide frames 6 are vertically attached at equal intervals (almost the length of the laminated antifouling panel) to the wall surface 12 of the intake channel where the removal and cleaning of the sea creatures have been completed, using the anchor bolts 7. The laminated antifouling panel 1 is inserted into both sleeves from above and the anchor bolts 7 are tightened and fixed. By repeating this operation, an antifouling coating layer composed of the laminated antifouling panel 1 is formed on all the wall surfaces 12 of the concrete intake channel. After that, the same antifouling paint was touch-up applied to the outer surface of the protective cap 8 of the guide frame 6 and the fastening and fixing anchor bolts 7 and 71 to complete the antifouling coating work.

Except during touch-up painting work, there is no need to manage the working environment (temperature, humidity, ventilation, etc.) necessary for normal painting work, and paint (mixing, usage time management, usage amount, etc.) management. The work was able to proceed according to the process plan regardless of the weather and weather conditions. As a result, construction costs and construction period have been significantly reduced.

By carrying out the antifouling coating method of the present invention, the advantages such as homogenization of the antifouling coating film, reduction of construction period, correction of skill or technical gap, reduction of construction cost, etc. can be confirmed. I was convinced that it was an excellent construction method for the lack of on-site construction.

By the way, the construction cost and the construction period in the construction of the present example were finished at about 1/3 and 1/2 of the ordinary painting construction, respectively.

Example 3 FIGS. 7 to 8 are a perspective view and a front view in which the box culvert type intake channel is subjected to the antifouling coating method of the present invention.

The construction outline is as follows. a) Antifouling target area: Approx. 190 m ² (3 m square × 20 m
Length) b) Number of laminated antifouling panels used: 120 sheets (900 mmw)
× 1800mmL = 1.5m ² / sheet ... 30 sheets (220mmw × 1800mmL = 0.3)
6m ² / sheet) c) Number of guide frames used …… 33 (100mmw ×
2000mmL) d) Number of anchor bolts used …… 292

The box culvert type intake channel is an underdrain type, and it is a site where the environment is extremely unsuitable for painting work. It is a work in a limited space, natural light does not reach, lighting equipment is required, it is difficult to carry in and out construction materials and equipment, and in addition, so-called 3K (dirty, hard, dangerous) work is inevitable painting It is the worst construction condition.

The antifouling coating method of the present invention has been introduced in order to reduce the physical or mental burden on the operator, to facilitate the construction, to ensure safety, and to shorten the construction period.

The construction was performed according to the following procedure. Carrying in scaffolding for work, assembly, surveying, marking out, embedding anchor bolts, mounting guide frame,
Inserting laminated antifouling panels, fastening anchor bolts, touch-up painting of guide frames and bolt caps, completion inspection, delivery, dismantling of scaffolding, and carrying out.

For the construction, the guide frames 6 are installed at equal intervals in the extension direction of the water channel (almost 900 mm in width of the laminated antifouling panel in this embodiment), and the laminated antifouling panels 1 are attached to both sleeve portions of the guide frame 6. Was inserted, moved to a predetermined position, and tightened and fixed with anchor bolts 7 and 71. Next, the outer surface of the guide frame 6, the anchor bolts 7, 71, and the protective cap 8 was touch-up coated with the same antifouling paint to complete the antifouling coating work.

Since painting in the box culvert type intake channel is a closed work, safety management (lighting, fall prevention, ventilation, fire, etc.) and working environment (temperature, humidity, ventilation, etc.) are required for construction. Maintenance is an important issue. According to the antifouling coating method of the present invention, the number of painting operations on site is drastically reduced, and only touch-up painting is performed. Safety management and coating environment management are easy and the construction period can be shortened, and the work can be completed safely and reliably.

[0056]

The antifouling coating method of the present invention is different from the conventional work of coating an antifouling paint on the surface of a concrete structure. Therefore, the following effects are obtained. There is no need to adjust and manage the work environment for a long time. No specialists or technicians required. Work is quick. Easy quality control of antifouling coating film. The quality of the finished coating film is uniform, eliminating concerns about coating film performance during the coating process.

Thus, the present invention is an extremely industrially and economically excellent antifouling coating construction method, since the painting work is easy, the construction work time is shortened, and the fear of quality performance is eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a laminated antifouling panel.

FIG. 2 is a cross-sectional view showing a method of coating a laminated antifouling panel on a concrete structure.

FIG. 3 is a front view showing a construction example for a tidal zone (parapet section) of the quay.

FIG. 4 is a cross-sectional view showing a construction example for a tidal zone (parapet part) of the quay.

FIG. 5 is a perspective view showing a construction example of a wall surface of an open channel type intake channel.

FIG. 6 is a front view showing a construction example of a wall surface of an open channel type intake channel.

FIG. 7 is a perspective view showing a construction example of a box culvert type intake channel wall surface.

FIG. 8 is a front view showing a construction example of a box culvert type intake channel wall surface).

[Explanation of symbols]

1: Laminated antifouling panel, 2: Antifouling coating, 3: Base material, 4: Adhesive, 5: Cushion material, 6: Guide frame, 7, 7
1: Anchor bolt, 8: Bolt cap, 9: Touch-up painting, 10: Steel sheet pile, 11: Parapet part, 1
2: wall surface, 13: bottom portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinori Ito 1 Goi Kaigan, Ichihara City, Chiba Tokyo Electric Power Company Goi Thermal Power Station

Claims (3)

[Claims] 1. A guide frame is attached to a surface of a target concrete structure which comes into contact with seawater in order to prevent adhesion of marine life to a concrete structure constructed in a seawater environment due to an antifouling paint, and through the guide frame. An antifouling coating method for a concrete structure, characterized in that panels coated with an antifouling paint are stretched around. 2. The antifouling coating method for a concrete structure according to claim 1, wherein the guide frame is made of FRP or engineering plastic, and is fixed and fixed to the surface of the concrete structure with anchor bolts. 3. The concrete according to claim 1, wherein the panel has a laminated structure in which a material selected from rigid FRP, engineering plastic, aluminum alloy or steel is used as a base material, and a cushion material is attached to the back surface. Antifouling coating method for structures.