JPH0212158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to surface corrosion protection of underwater steel structures.

``Prior Art'' Regarding the corrosion protection of marine structures such as iron sheet piles or pier steel piles, long-term maintenance and corrosion protection of underwater or splash zone parts is extremely important, but very difficult. Currently, underwater corrosion-resistant paints, underwater bonds, composite corrosion-proofing methods using underwater adhesives and various sheets, and various other materials,
There are several methods, but as a practical matter, when applying adhesive or pressure-bonding to a surface to be coated underwater or on a wet surface,
Initial adhesion is poor due to the influence of water and seawater, causing problems such as shifting or peeling before it can function properly.
Satisfactory materials and construction methods have not yet been found. The Magnesheet pasting method, which uses magnetic force as a composite anti-corrosion method using underwater adhesive and various sheets, is an excellent construction method as there is no need to worry about floating or shifting due to waves during construction. However, the tarpaulin itself was expensive.

"Problems to be Solved by the Invention" The purpose of the present invention is to quickly and reliably provide anti-corrosion treatment to the surface of steel structures located below sea level. intended for use.

"Means and Procedures for Solving the Problems" The present invention involves applying a corrosion preventive agent to one side of a waterproof sheet in the air, carrying this into the water or into the air, and applying it to the surface of an underwater steel structure or a wet surface above the water level. The above-mentioned sheet is spread out in contact with the above-mentioned surface, and the anti-corrosion agent is adsorbed to the same surface by the magnetic force of the same sheet, and after the anti-corrosion agent has hardened, the same sheet is removed, and the sheet is repeatedly used in the same manner as above, and the anti-corrosion agent applied is It consists of a corrosion protection method for steel structures that is characterized by attaching it to the surface.

``Function'' Therefore, when a diver brings the above-mentioned anticorrosion agent-coated sheet, which has been applied in the air by 0.3 to 5 mm, into the water and adheres it to the surface of the above-mentioned structure, the outer surface of the sheet is stretched by hand along the same surface. By spreading, seawater between the surface and the corrosion inhibitor is removed, and the corrosion inhibitor starts adhering to the surface. At this time, the sheet is completely attracted to the surface by its magnetic force, or the outer surface is pressed by an auxiliary magnet and the sheet is attached to the surface by the magnetic force. After the initial adhesive action is completed, the sheet is attached and detached.

``Example'' The waterproof sheet 1 is made of a flexible magnetic rubber sheet, such as a sheet coated with a corrosion-resistant agent and laminated with polyethylene resin, and is cut into a predetermined size. Then, a corrosion-resistant underwater adhesive (epoxy, urethane, polyester, acrylic, etc.) 2 is applied to one side of the sheet 1 in the air. Then, a diving worker carries this into seawater 3 and applies it to the underwater surface 5 of marine steel structures 4 such as steel sheet piles and pier steel piles, which have already been polished by underwater sandplast, etc., and the wet polished surface 5 above the water level. The above-mentioned anticorrosion agent 2 is brought into contact with the outer surface of the sheet 1 and spread by hand in all directions. In this way, the sheet 1 is pressed and attached to the surface 5 by its magnetic force, and the seawater interposed between the anticorrosion agent 2 and the surface 5 is discharged from the four edges of the sheet 1, and the anticorrosion agent 2 is applied to the surface 5. Corrosion inhibitor 2 that adheres and hardens.
The above-mentioned surface 5 can be covered with the coating film to prevent corrosion, and the waterproof sheet 1 can be reused. It is also possible to use a non-magnetic rubber sheet as the waterproof sheet 1 and attach a permanent magnet to the outer surface of the sheet 1 during the above-mentioned spreading.

"Effects" Since the present invention is based on the method described above, there is no need to apply or adhere a waterproof paint to the surface 5 of the underwater steel structure 4, and seawater is interposed between the underwater surface 5 and the anticorrosion agent 2. Not only can the sheet 1 be bonded to the surface 5 without any damage, but also the magnetic force can quickly and reliably bond the sheet 1 to the surface 5 without fear of it coming off or shifting from the surface 5 during the spreading and initial adhesion of the corrosion preventive agent 2, and without being affected by waves. 5 can be treated with anti-corrosion treatment. Furthermore, the waterproof sheet 1 can be used repeatedly, thereby reducing construction costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a state of corrosion-proofing by the corrosion-proofing method of a steel structure of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the steel structure with the waterproof sheet removed. 1... Waterproof sheet, 2... Corrosion inhibitor, 3... Underwater, 4... Underwater steel structure, 5... Surface.

Claims (1)

[Claims] 1. Apply a corrosion inhibitor to one side of a waterproof sheet in the air, bring it into the water or air, bring it into contact with the surface of an underwater steel structure or a wet surface above the water level, spread the sheet, and apply the magnetic force of the sheet. Corrosion protection of steel structures, characterized in that the sheet is removed after the corrosion inhibitor has hardened by being adsorbed to the same surface by a method, and the sheet is repeatedly used by the same method to cause the applied corrosion inhibitor to adhere to the same surface. Law.