JPH0725047U - Protective cover for anticorrosion and antifouling of steel structures - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a protective cover which prevents adhesion of aquatic organisms to a steel structure and also has an anticorrosive action. [Structure] A metal layer 3 made of copper or a copper alloy is provided on the outer surface of a plastic molded product 2 having an inner surface shape similar to the outer surface of a steel structure such as a steel pipe pile 5 constructed from underwater to above the water surface. Anti-corrosion and anti-fouling protective cover for steel structures.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention prevents corrosion in seawater or freshwater submerged parts, tidal parts and splash zones of steel structures such as steel pipe piles, steel sheet piles, steel pipe sheet piles, etc., as well as submerged parts and tidal parts of the steel structures. It relates to a protective cover for preventing the adhesion of aquatic organisms such as shellfish.

[0002]

[Prior art]

 In general, steel pipe piles, steel sheet piles, steel pipe sheet piles, and other steel structures are particularly corroded due to repeated contact of water and oxygen in the air in the tidal parts and splash zones, and further It is known that a large amount of shellfish adheres to the submerged and tidal parts of the seawater, which not only impairs the appearance but also increases the resistance to waves and reduces the strength and safety of the structure. There is.

As a method for preventing corrosion in the submerged part and tidal part of the steel structure and adhesion of aquatic organisms, conventionally, a method of applying anticorrosion coating to the steel structure and applying an organic tin compound to the upper layer thereof has been widely used. Although it has been used, in recent years, the toxicity of organotin compounds and their persistence in seafood have become problems, and their use has come to be restricted.

Therefore, from the viewpoint of safety, copper and copper alloys, which have long been known that aquatic organisms are unlikely to attach and toxicity is hardly a problem, have been regained attention from the viewpoint of safety. However, when copper or copper alloy is directly contacted with the surface of a steel structure, there is a drawback that the contact portion of the steel structure is intensively corroded.

Therefore, as a method for anticorrosion and antifouling of a steel structure using copper or a copper alloy, for example, on the surface of the steel structure submerged in the sea, it is necessary to insulate the steel structure in advance before constructing the steel structure in the sea. A method of coating or lining a material and spraying copper or a copper alloy on the material has been proposed (see JP-A-59-145074).

[0006]

[Problems to be solved by the device]

 Although the above-mentioned method of spraying copper or copper alloy onto the coating or lining of the insulating material is effective in preventing marine organisms from adhering to newly constructed steel structures in the sea, It was technically impossible to coat or line a steel structure constructed in the sea and spray copper or a copper alloy on it. Therefore, a steel structure has been constructed in the sea, in which a steel structure is coated or lined with an insulating material in advance and a sprayed film made of a metal layer of copper or a copper alloy is formed. However, when constructing a steel structure with a copper or copper alloy sprayed coating formed on a coating or lining of insulative material in the sea, it may be necessary to pour, and the mechanical vibration during piling In some cases, the coating or lining of insulating material and a part of the copper or copper alloy sprayed coating may be peeled or damaged due to shock or impact.

As described above, it is impossible to repair such peeling or damage, and it is also impossible to re-spray the copper or copper alloy sprayed coating when it is exhausted.

[0008]

[Means for Solving the Problems]

 Therefore, the inventors of the present invention have conducted research to solve the problems of the prior art, and as a result, the copper on the outer surface of a plastic molding having an inner surface shape similar to the outer surface of a steel structure constructed from underwater to above the water surface. Alternatively, a corrosion-resistant and anti-fouling protective cover for a steel structure provided with a metal layer made of a copper alloy is prepared in advance, and the anti-corrosion and anti-fouling protective cover is attached to a steel structure constructed in the sea by bolts or the like. It is possible to prevent the above-mentioned peeling or damage when building a steel structure, and further, even if the coating or lining of the insulating material is damaged due to long-term use and the metal layer such as copper or copper alloy wears out, We have obtained the knowledge that repairs can be easily done by replacing the anticorrosion and antifouling protection cover.

The present invention has been made on the basis of such findings, and copper or copper alloy is formed on the outer surface of a plastic molded product having an inner surface shape similar to the outer surface of a steel structure constructed from underwater to water surface. It is characterized by an anticorrosion and antifouling protective cover for a steel structure provided with a metal layer consisting of.

[0010]

[Action]

 The function and configuration of the anticorrosion and antifouling cover according to the present invention will be described more specifically with reference to the drawings.

FIG. 1 is a perspective view of an anticorrosion and antifouling protective cover of the present invention. The anticorrosion and antifouling protective cover 1 of the present invention has an inner surface shape similar to the outer surface of a steel structure constructed horizontally from underwater. The plastic molded product 2 and the metal layer 3 of copper or copper alloy formed on the outer surface of the plastic molded product 2.

In order to attach the anticorrosion / antifouling protection cover 1 to the steel structure 5, the flange portion 4 of the anticorrosion / antifouling protection cover 1 is expanded so that the periphery of the steel structure 5 is anticorrosion / antifouling as shown in FIG. It is surrounded by the stain protection cover 1 and tightened with bolts 6 to fix the anticorrosion and stain protection cover 1 to the steel structure 5. At this time, the anticorrosion material 7 is sandwiched between the anticorrosion / fouling protection cover 1 and the steel structure 5.

Since the plastic molded product 2 and the metal layer 3 have poor adhesion, the plastic molded product 2 and the metal layer 3 are spread when the flange portion 4 of the anticorrosion / fouling protection cover 1 is expanded and attached to the steel structure 5. The metal layer 3 may be peeled off from the plastic molded product 2 because the physical properties of the resin are significantly different. In particular, it frequently occurs when the metal layer 3 is formed on the outer surface of the plastic molded product 2 by thermal spraying. In order to prevent the metal layer 3 from peeling off due to thermal spraying of the anticorrosion / fouling protection cover 1, a plastic molded product 2 having a concave portion 8 and a convex portion 9 formed on the outer surface thereof was prepared as shown in the sectional view of FIG. When the metal layer 3 is formed on the outer surface of the plastic molded product 2 by thermal spraying, the plastic molded product 2 and the metal layer 3 are more firmly adhered by adding mechanical adhesion strength, and the flange portion 4 is widened to expand the metal layer 3. Does not peel off from the plastic molded product 2. Alternatively, as shown in the cross-sectional view of FIG. 4, a plastic molded product 2 in which the metal wire 10 is embedded on the outer surface may be prepared, and the metal layer 3 formed by thermal spraying may be formed on the outer surface.

The metal layer 2 is not limited to the metal layer formed by thermal spraying as described above, but a metal thin plate or a wire net may be fixed to the outer surface of the plastic molded product 2 with a tack or an adhesive. As another anticorrosion and antifouling protective cover of the present invention, as shown in the perspective view of FIG. 5, an anticorrosion and antifouling in which a metal layer 2 is formed on the outer surface of a plastic molding 2'having two flange portions 4 and 4. It may be the protective cover 1 '. As a set of two anticorrosion and antifouling protection covers 1 ', the steel structure 5 is sandwiched and bolts 6 are tightened to attach the anticorrosion and antifouling protection cover 1'to the steel structure 5 as shown in the sectional view of FIG. Can be attached. Also at this time, the anticorrosion effect can be further improved by sandwiching the anticorrosive material 7 between the steel structure 5 and the anticorrosion / antifouling protective cover 1 '.

[0015]

【Example】

 An anticorrosion and antifouling protective cover having the shape shown in FIG. 1 was prepared in which a pure copper sprayed coating having a thickness of about 0.2 mm was formed on the outer surface of a plastic molding made of glass fiber-containing polypropylene having a flange portion.

On the other hand, the steel pipe pile of the new pier is covered with anti-corrosion materials (tape-shaped non-woven fabric impregnated with petrolatum, tannin and rust preventive agent) from about 0.5 m below the water level at low tide to the bottom of the concrete footing. Then, the anticorrosion and antifouling protective cover was put on it, and it was fixed to the steel pipe pile by tightening bolts, and left in this state for one year. As a result of observing the adhesion state of marine organisms after leaving it for 1 year, almost no adhesion of marine organisms was observed, but the damage of the pure copper sprayed coating of the anticorrosion and antifouling protective cover was remarkable, so the new anticorrosion and antifouling protective cover Exchanged and repaired.

For comparison, a coated steel pipe pile having a surface coated with an epoxy resin and a sprayed coating of pure copper was prepared, the coated steel pipe pile was driven, and a jetty was newly constructed by the conventional method. However, the epoxy resin coating film and a portion of the pure copper sprayed coating were damaged by the impact during casting. However, when left as it was for 1 year and after 1 year, the state of marine organisms was observed, the marine organisms were hardly observed, but the epoxy resin coating film and the pure copper sprayed coating were severely damaged, requiring repair. However, it was impossible to repair the epoxy resin coating film and pure copper sprayed coating formed on the surface of the steel pipe pile 0.5 m below the low water level because it was in the sea.

[0018]

[Effect of device]

 As described above, the anticorrosion / fouling protection cover of the present invention can be applied to (1) a steel structure constructed in water and then mounted, so that it cannot be applied not only to a newly constructed steel structure but also to the conventional technology. Corrosion and antifouling of existing steel structures can be performed.

(2) There is no damage to the coating or lining of the insulating material and the copper or copper alloy metal layer due to mechanical vibration or impact generated when the steel structure is driven into the sea as in the past.

(3) Since it is easy to install and remove, it is excellent in that it can be easily repaired even if the coating or lining of the insulating material is damaged and the copper or copper alloy metal layer is consumed. It is effective.

[Brief description of drawings]

FIG. 1 is a perspective view of an anticorrosion / fouling protection cover of the present invention.

FIG. 2 is a perspective view showing a state in which the anticorrosion / fouling protection cover of FIG. 1 is attached to a steel pipe pile.

FIG. 3 is a cross-sectional view showing a state in which a metal layer is coated on the outer surface of a plastic molded article of the anticorrosion / fouling protection cover of the present invention so as not to peel off.

FIG. 4 is a cross-sectional view showing a state in which a metal layer is coated on the outer surface of a plastic molded article of the anticorrosion / fouling protection cover of the present invention so as not to peel off.

FIG. 5 is a perspective view of another anticorrosion / fouling protection cover of the present invention.

FIG. 6 is a cross-sectional view showing a state in which the anticorrosion / fouling protection cover of FIG. 5 is attached to a steel pipe pile.

[Explanation of symbols]

 1 Anticorrosion and Antifouling Protective Cover 1'Corrosion and Antifouling Protective Cover 2 Plastic Molded Product 2'Plastic Molded Product 3 Metal Layer 4 Flange 5 Steel Pipe Piles 6 Bolts 7 Anticorrosion 8 Recesses 9 Convex 10 Metal Wire

Claims (1)

[Scope of utility model registration request] 1. A steel structure characterized in that a metal layer made of copper or a copper alloy is provided on the outer surface of a plastic molded product having an inner surface shape similar to the outer surface of a steel structure constructed from underwater to above the water surface. Protective cover for anticorrosion and antifouling.