JPH0749662B2 - Anticorrosion repair method for underwater driving members - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a steel pipe pile, a steel sheet pile,
The present invention relates to an anticorrosion repair method for underwater driving members such as steel pipe sheet piles.

[Prior art]

Conventionally, as a method of anticorrosive repair of underwater driving members, Japanese Patent Laid-Open No.
-29916, that is, the innermost layer is an anticorrosion layer mainly composed of a petrolatum-based food material that exhibits anticorrosion action, the intermediate layer is a buffer layer exhibiting impact resistance, and the outermost layer is reinforced plastics or corrosion resistance. There is known a method of winding and fixing an integrally molded anticorrosion body having a three-layer structure having a protective cover made of metal around an anticorrosion repaired portion of an underwater driving member.

[Problems to be solved by the invention]

However, after performing a test anticorrosion repair construction by the above-mentioned conventional anticorrosion repair method of the underwater driving member, after removing the anticorrosion body and observing the anticorrosion repaired part, the underwater part (empirically the average water surface In the lower part), the petrolatum-based anti-corrosion material was fully adhered to the anti-corrosion repaired part and showed a sufficient anti-corrosion repair effect, but in the upper part of the water (the part that is empirically higher than the average water surface) However, there was a portion where the petrolatum-based anti-corrosion material was not sufficiently adhered, and red rust was generated on the underwater driving member at the portion where the adhesion was insufficient.

As a result of studying this, the reason why the petrolatum-based anticorrosive material adheres to the underwater driving member entirely in the underwater area is that the integrally molded anticorrosive body is pressed against the underwater driving member by water pressure. In the section, since the pressing force due to water pressure does not act on the integrally molded anticorrosion body, a gap is created between the integrally molded anticorrosion body and the anticorrosion repaired portion of the underwater driving member at the beginning of mounting, It was found that red rust occurred in the corrosion-protected repair area.

[Object and Structure of Invention]

An object of the present invention is to provide an anticorrosion repair method for an underwater driving member that can advantageously solve the above problems, in which the upper end of the anticorrosion repaired portion of the underwater driving member is located above the water surface. With the lower end of the anticorrosion repair portion located in the underwater portion, in the method of anticorrosion repairing the anticorrosion repair portion with a petrolatum-based anticorrosive material, the flexible material protective cover 1 and its outermost layer are formed. An integrally molded anticorrosion body 3 having at least two layers of a petrolatum-based anticorrosive material layer 2 which constitutes the innermost layer under the protective cover 1 is manufactured in the atmosphere, and is formed above the water surface of the underwater driving member 4. A petrolatum-based anti-corrosion material layer 5 is formed by coating on the anti-corrosion repaired portion located next, and then the anti-corrosion body 3 is formed.
In the first aspect of the invention, there is provided an anticorrosion repair method for an underwater driving member, characterized in that the anticorrosion material layer 2 is abutted and fixed to an anticorrosion repairing portion located below the water surface. In a state in which the upper end of the above is located above the water surface and the lower end of the corrosion-protected repair part is located in the underwater part, the outermost layer can be formed in the method for repairing the corrosion-protected repair part with a petrolatum-based anticorrosive material. At least 2 of the flexible material protective cover 1 and the petrolatum-based anti-corrosion material layer 2 constituting the innermost layer below the protective cover 1
The integrally formed anticorrosion body 3 having layers is manufactured in the atmosphere,
The anti-corrosion material layer 2 of the petrolatum type in the anticorrosion body 3,
After abutting and fixing to the anticorrosion repaired portion of the underwater driving member 4 located below the water surface, the anticorrosion repaired portion of the underwater driving member 4 located above the water surface and the upper portion of the protective cover 1 A second aspect of the present invention is a method of anticorrosion repair of an underwater driving member, which comprises forming a petrolatum-based anticorrosive material between the two to form the anticorrosion material layer 6.

〔Example〕

 Next, the present invention will be described in detail with reference to the illustrated example.

6 to 8 show an example of the anticorrosion body 3 used in the case of carrying out the present invention, in which the sheet-like protective cover 1 constituting the outermost layer contains a carbon black and an antioxidant. The protective cover 1 is made of low density polyethylene, and the flanges 7 are bent and connected to both ends of the protective cover 1 in the left-right direction, and the outer surfaces of both ends of the protective cover 1 and the flange 7 are made of stainless steel having an L-shaped cross section. The metal fitting 8 is polymerized and fixed by an adhesive or a screw, and further, a large number of through holes 9 for inserting bolts are provided in the overlapped portion of the flange 7 and the steel connecting metal fitting 8, and the lower side of the protective cover 1 is provided. On the inner surface, the petrolatum-based anticorrosive material layer 2 forming the innermost layer is integrally laminated and arranged to produce a two-layer anticorrosion body 3, which is produced in the atmosphere.

FIGS. 1 to 3 show an embodiment of the first invention. First, as shown in FIG. 1, the corrosion-prevented substance located above the water surface (average water surface) 10 of the underwater driving member 4 is shown. The petrolatum-based anticorrosive material layer 5 is directly applied to the repaired portion by a coating means such as hand coating, brush coating or roller coating, and then, as shown in FIGS. Of the anti-corrosion material layer 2 in the water surface 10 in the underwater driving member 4
It is wound around the portion to be protected against corrosion so as to be positioned below the outer surface, and the exposed portion of the inner surface of the protective cover 1 in the body 3 is wrapped around the outer surface of the material layer 5, and then the flanges 7 and Tighten the anticorrosion body 3 with a large number of bolts 11 that are inserted through the through holes 9 for inserting the bolts of the steel connecting fitting 8, and adhere the entire surface of the anticorrosion layer 2 on the anticorrosion body 3 to the anticorrosion repaired part under the water surface. At the same time, the inner surface of the upper side of the protective cover 1 in the anticorrosion body 3 is brought into close contact with the outer surface of the anticorrosive material layer 5 on the water surface.

FIGS. 4 and 5 show an embodiment of the second invention. First, as shown in FIG. 4, the anticorrosion material layer 2 in the anticorrosion body 3 is removed from the water surface 10 in the underwater driving member 4. Is also wound around the anticorrosion repaired portion located below, and as described above, the anticorrosion body 3 is tightened with a large number of bolts so that the entire surface of the petrolatum-based anticorrosion material layer 2 becomes the anticorrosion repaired portion of the underwater driving member 4. Close contact, then on the water surface, the underwater driving member 4
The petrolatum-based anticorrosive material is filled in the annular space formed between the protective cover 1 and the protective cover 1 to form an anticorrosive material layer 6 that is in close contact with the anticorrosion repaired portion on the water surface, as shown in FIG.

If the rigidity of the protective cover 1 forming the outermost layer of the anticorrosion body 3 is high, the adhesion effect of the petrolatum-based food material to the corrosion-protected repair part due to water pressure is reduced, but the protective cover 1 is made of a flexible material such as polyethylene. If the material is used, the petrolatum-based anticorrosive material can be reliably adhered to the anticorrosion repaired portion over the entire surface by water pressure.

FIG. 9 shows an anticorrosion body 3 which can be used when the present invention is carried out.
In another example, a buffer layer 12 made of expanded polyethylene having open cells and a water-swelling layer 13 made of a urethane-based water-swelling material are provided on the entire inner surface of the protective cover 1 forming the outermost layer. Are sequentially and integrally laminated, and further, on the inner surface of the lower side of the water-swelling and swelling layer 13, the petrolatum-based anti-corrosion material layer 2 which constitutes the innermost layer is integrally laminated and formed. Or, it is similar to the case of the anticorrosion body 3 shown in FIG.

FIG. 10 and FIG. 11 show an example in which the present invention is applied to the anticorrosion repair of the underwater driving member 4 made of steel sheet pile,
On the inner surface of the protective cover 1 made of low-density polyethylene having a grooved cross section with a flange, which is similar to the outer surface of the steel sheet pile wall 14, a buffer layer 12 made of continuous foam polyethylene, a urethane-based water swelling layer 13, and a petrolatum-based anticorrosive material. The layer 2 and the layer 2 are sequentially and integrally laminated, the anticorrosion material 2 is brought into contact with the outer surface of the steel sheet pile wall 14, and the flange portion of the protective cover 1 is fixed to the steel sheet pile wall 14 by a drive pin 15. There is.

Also in the case of FIG. 10 and FIG. 11, the first invention and the second invention
The invention may be implemented.

〔The invention's effect〕

According to the present invention, in the underwater portion, the petrolatum-based anticorrosion material 2 in the anticorrosion body 3 is exerted by the pressing force by the water pressure.
Is pressed against the anticorrosion repair portion of the underwater driving member 4, so that the anticorrosion material layer 2 can be surely adhered to the underwater corrosion protection repair portion over the entire surface to surely perform anticorrosion repair,
Moreover, above the water surface, since the petrolatum-based anti-corrosion material layers 5 and 6 are directly adhered to the anti-corrosion repair portion of the underwater driving member 4 by coating or filling, the anti-corrosion repair located above the water surface. The part can be surely subjected to anticorrosion repair, and the petrolatum-based anticorrosion material has a property that it is difficult to apply it to the anticorrosion repair part in the underwater part, but it is easy to apply to the anticorrosion repair part above the water surface. In the case of the present invention, by effectively utilizing this characteristic, it is possible to easily and reliably perform anticorrosion repair on the anticorrosion repaired portion above the water surface. In the case of the second aspect of the invention, the petrolatum-based anticorrosive material layer 2 of the anticorrosion body 3 is abutted and fixed to the anticorrosion repaired portion of the underwater driving member 4 located below the water surface, and then the underwater driving member 4 is pressed. In this case, since the petrolatum-based anticorrosive material is filled between the anticorrosion repaired portion located above the water surface and the upper portion of the protective cover 1 to form the anticorrosion layer 6, the above-mentioned water surface can be formed by a simple means. It is possible to obtain the effect that the petrolatum-based anticorrosive material layer 6 having a predetermined thickness can be provided on the entire circumference of the anticorrosion repaired part.

[Brief description of drawings]

FIGS. 1 to 3 show an embodiment of the first invention, and FIG. 1 shows a state in which a petrolatum-based anticorrosive material layer is applied and formed on a portion to be protected against corrosion on the water surface of an underwater driving member. FIG. 2 is a longitudinal side view showing the state, FIG. 2 is a longitudinal side view showing a state in which the anticorrosive repair processing of the underwater driving member is completed, and FIG. 3 is a transverse plan view thereof. 4 and 5 show an embodiment of the second invention, and FIG. 4 shows a state in which an anticorrosive body is fixed to an underwater driving member and an anticorrosive repair portion under the water surface is subjected to anticorrosive repair. FIG. 5 is a vertical cross-sectional side view showing a state in which the anticorrosion repaired portion above and below the water surface is subjected to anticorrosion repair. 6 to 8 show an anticorrosive body used in an embodiment of the present invention, in which FIG. 6 is a front view and FIG.
6 is a sectional view taken along the line AA of FIG. 6, and FIG. 8 is a sectional view taken along the line BB of FIG.
It is a line sectional view. FIG. 9 is a vertical sectional side view showing another example of the anticorrosion body which can be used when the present invention is carried out. 10th
FIG. 11 is a cross-sectional plan view showing an example of the case where the present invention is applied to anticorrosive repair of an underwater driving member made of steel sheet pile, and FIG. 11 is a cross-sectional plan view showing an enlarged part of FIG. In the figure, 1 is a flexible material protective cover, 2 is an anti-food material layer, 3 is an anti-corrosion body, 4 is an underwater driving member, 5 is an anti-food material layer, 6
Is an anti-corrosion layer, 7 is a flange, 8 is a steel connecting fitting, 10 is a water surface, 11 is a bolt, 12 is a buffer layer, and 13 is a water absorption swelling layer.

Claims (2)

[Claims] 1. In a state where the upper end of the anticorrosion repaired part of the underwater driving member is located above the water surface and the lower end of the anticorrosion repaired part is located in the underwater part, the anticorrosion repaired part is protected by a petrolatum system. In the method of anticorrosion repair with food material, an integral molding having at least two layers of a protective cover 1 made of a flexible material forming the outermost layer and a petrolatum-based food protection layer 2 forming the innermost layer under the protective cover 1. The corroded anticorrosion body 3 is manufactured in the atmosphere, and the underwater driving member 4 is manufactured.
On the anticorrosion repaired part located above the water surface, the petrolatum-based anticorrosion material layer 5 is applied and formed, and then the anticorrosion repaired part 2 on the anticorrosion body 3 is located below the water surface. A method for preventing corrosion of an underwater driving member, which comprises abutting and fixing it on the underwater. 2. The anticorrosion repair part of the underwater driving member is located above the water surface, and the bottom end of the anticorrosion repair part is located underwater. In the method of anticorrosion repair with food material, an integral molding having at least two layers of a protective cover 1 made of a flexible material forming the outermost layer and a petrolatum-based food protection layer 2 forming the innermost layer under the protective cover 1. The corroded anticorrosion body 3 is manufactured in the atmosphere, and the petrolatum-based anticorrosion material layer 2 in the anticorrosion body 3 is attached to the underwater driving member 4.
Of the petrolatum system between the anticorrosion repaired part located above the water surface of the underwater driving member 4 and the upper part of the protective cover 1 after being fixed by abutting to the anticorrosion repaired part located below the water surface. Filled with the anti-food ingredients, the anti-food ingredients layer 6
A method for preventing corrosion of an underwater driving member, which comprises forming