JPH11336110A - Repairing member for existing anticorrosive steel material and repairing method for existing anticorrosive steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing member and a repairing method for an existing corrosive steel material capable of achieving complete maintenance free after repairing. SOLUTION: For a repairing member 1, a base plate material 2 formed of pure nickel, pure iron or low carbon steel is laminated and arranged to be projected out of the peripheral edge of a titanium thin plate material 3 and the titanium thin plate material 3 is previously welded at its edge or in its vicinity to the base plate material 2. The repairing member 1 is arranged on the repair required portion of an existing anticorrosive steel material 5 in the way of locating the titanium thin plate material 3 on the surface side thereof and the portion of the base plate material 2, projected out of the peripheral edge of the titanium thin plate material 3, is welded to a mother steel material 6 for the existing anticorrosive steel material 5, and then an area ranging from the end face of the titanium thin plate material 3, including a welded portion 8 between the base plate material 2 and the mother steel material 6 for the existing anticorrosive steel material 5, is coated with a non-conductive sealing material 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for repairing damaged portions of existing anticorrosion steel materials whose portions exposed to a corrosive environment are coated with a rust-preventive paint, polyurethane, or even a polyethylene sheet. The present invention relates to a repair member and a repair method thereof.

[0002]

2. Description of the Related Art Existing anticorrosion steel materials (steel sheet piles, steel pipe sheet piles, steel pipe piles, panel members for various marine structures, etc.) include, for example, areas where corrosion by sea salt particles is severe, such as near harbors and river mouths. In this case, a so-called heavy-corrosion-proof steel material is used, in which a portion of the sea salt particles to which the droplets adhere is coated with a polyurethane spray coating or a polyethylene film sticking coating. In an area where the environment is relatively moderate, anticorrosion steel materials are used in which a portion where sea salt particles are attached is coated with an anticorrosive paint.

[0003] All of the above-mentioned anticorrosion steels are satisfactory for use in terms of the anticorrosion performance of the anticorrosion material itself. However, none of the above anticorrosion materials is chemically or systematically bonded to the base steel material. Therefore, in any case, the adhesive surface is reduced in adhesion due to aging and easily peels off.

Therefore, existing corrosion-resistant steel materials need to be reinforced or repaired on a regular basis. At present, however, there is no established method for completely reinforcing or repairing them.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a repairing member for an existing corrosion-resistant steel material, in which the reinforced or repaired portion of the corrosion-resistant material does not peel off due to aging and becomes completely maintenance-free after the fact. To provide a repair method.

[0006]

The gist of the present invention resides in the following (1) a member for repairing an existing anticorrosion steel and a method (2) for repairing an existing anticorrosion steel.

(1) A base plate made of pure nickel, pure iron or low carbon steel is laminated and arranged so as to protrude from the peripheral edge, and at least the vicinity of the edge of the titanium thin plate is welded to the base plate in advance. Repair parts for existing corrosion-resistant steel.

(2) A rust-preventive paint having all or part of its surface,
Claim 1: A part requiring repair of an existing anticorrosion steel material covered with a polyurethane or polyethylene sheet or the like.
After placing the repair member described in the above with the titanium sheet material side facing up, and then welding and joining the base plate part protruding from the edge of the titanium sheet material in the repair member to the existing base material of the anticorrosion steel A method for repairing an existing anticorrosion steel material in which at least a region including a welded joint portion between a base plate material and a base steel material of an existing anticorrosion steel material from at least an end face of the titanium thin plate material is covered with a non-conductive sealing material.

The repair member according to the above (1) may be one in which the base plate is welded in advance only to the peripheral portion of the titanium thin plate. In the repair method according to the above (2) in the case where the repair member is used, it is necessary to repair the existing anticorrosion steel material after applying an adhesive in advance on the back surface of the titanium thin plate material without the base plate material. It is preferable that the repairing member be disposed at the portion to be repaired with the titanium sheet material side facing up.

The present inventor has proposed, as an anticorrosion material which can substitute for a rust preventive paint, a polyurethane and a polyethylene sheet, among metal materials which can be welded to a base steel material and which do not peel off due to aging. The present invention was completed by paying attention to titanium excellent in corrosion resistance and landscape.

That is, the base steel of the existing anticorrosion steel is
From the viewpoint of securing the strength, the Fe-based alloy usually has a carbon content of 0.03% by weight or more. Therefore, when titanium is directly welded and joined to this Fe-based alloy, a large amount of titanium carbide is generated in the weld metal and cannot be welded, or even if it can be made, the joint is extremely brittle and easily peels off.

However, pure nickel, pure iron, or low-carbon steel having a carbon content of less than 0.03% by weight (hereinafter simply referred to as low-carbon steel) is not included in the weld metal even when titanium is directly welded and joined. A large amount of titanium carbide is not generated, and it is strongly welded and joined to the existing base material of anticorrosion steel.

Therefore, as a repairing member, a base plate made of pure nickel, pure iron, or low carbon steel is laminated and arranged so as to protrude from the peripheral edge of the titanium thin plate, and both are welded in advance. The repaired member that has been joined is manufactured, and this repairing member is placed on a portion of the existing anticorrosion steel material that requires repair, with the titanium thin plate side facing up, and the base plate protruding from the peripheral edge of the titanium thin plate. When the portion is welded and joined to the existing base steel of the anticorrosion steel, the thin titanium plate does not peel off. As a result, it is completely maintenance-free after the fact.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A repair member for an existing corrosion-resistant steel material and a method for repairing the existing corrosion-resistant steel material according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of a repair member according to the present invention and a state of implementation of a method for repairing an existing anticorrosion steel material using the repair member.

As shown in the drawing, the repair member 1 of the present invention
Is composed of a base plate 2 and a titanium thin plate 3 having substantially the same thickness, and the base plate 2 protrudes from the entire peripheral edge of the titanium thin plate 3. The two are joined by a non-penetrating welded joint 4 from the back side of the base plate 2.

As described above, the base plate material 2 may be any of pure nickel, pure iron, and low carbon steel having a carbon content of less than 0.03% by weight, but from the viewpoint of strength and economy. It is preferable to use low carbon steel.

As shown in the figure, it is most preferable that the welded joint portion 4 is formed over the entire periphery in the vicinity of the edge of the titanium sheet material 3 and that a plurality of central portions in the width direction are also formed over substantially the entire length. For example, it may be formed continuously or partially only on both sides in the width direction. Alternatively, the base plate 2 may be through-welded from the back side, or may be non-penetrating or through-welded from the front side of the titanium thin plate. However, in each case, a weld bead remains on the surface of the titanium sheet material, which is not only costly afterwards, but also degrades the appearance if post-treatment is not performed. It is preferable to perform non-penetration welding from the back side of the plate material 2.

The welding method used to form the weld joint 4 is as follows:
Although not particularly limited, a laser welding method or a seam welding method is preferable. This is particularly true when the base plate 2 is made of low-carbon steel, because the flow of the molten metal in the depth direction is smaller than when other welding methods are used, and titanium carbide can be generated in the weld metal. This is because the bonding strength can be suppressed as much as possible, and a stronger bonding strength can be obtained.

It is preferable that both the base plate 2 and the titanium thin plate 3 have a thickness of about 0.2 to 2 mm. The reason is as follows. If the thickness of both, especially the thickness of the titanium sheet material 3 is less than 0.2 mm, it is practically impossible to perform the welding joining by laser welding or seam welding without impairing the surface quality of the titanium sheet material 3 or the like. . Further, when the thickness of both of them exceeds 2 mm, when the existing anticorrosion steel material 5 is, for example, a steel sheet pile as shown in FIG. This is because not only is the buckling reaction force too large to make working difficult, but also the material cost increases and the economic advantage is lost.

It is sufficient that the protrusion width of the base plate 2 is 3 to 5 mm, but it may be larger. However, if it is too large, the area covered by the sealing material 9 described later is widened, and not only does the coating work take many steps, but also the amount of the sealing material 9 used increases, which is not economical. For this reason, it is preferable that the protrusion width is set to about 3 to 5 mm.

FIG. 2 is a partial sectional view (corresponding to a sectional view taken along line II in FIG. 1) showing another example of the repairing member of the present invention. The repair member 10 is different from the repair member 1 shown in FIG. 1 in that the base plate 2 is provided only on the peripheral edge of the titanium thin plate 3. At the time of use, as shown in the figure, as shown in the figure, an adhesive material 11 (or an adhesive material) may be applied to a portion of the rear surface of the titanium thin plate material 3 where the base plate material 2 does not exist.
Is applied in advance and used.

Next, a method for repairing an existing anticorrosion steel material of the present invention will be described in detail. As shown in FIGS. 1 and 2,
The repairing member 10 in which the adhesive 11 is applied in advance to the portion of the anticorrosion film 7 that requires reinforcement or repair of the existing anticorrosion steel 5 or the portion where the above-described repairing member 1 or base plate 2 does not exist is replaced with titanium. Lamination is arranged with the thin plate material 3 side facing up.

At this time, when the existing anticorrosion steel 5 is a sheet pile as shown in FIG. 3, a repairing member laminated and arranged by pressing a shaping tool or a roller having the same shape as the existing anticorrosion steel 5 manually. The molding of 1 or 10 is performed. For this reason, a special molding device is not necessarily required.

At this time, in the case of the repair member 10, an adhesive 11 is applied in advance to a portion where the base plate 2 does not exist, and the repair member 10 is applied to the repair member 10 by the adhesive 11. , The stacking position is stable, and the molding operation can be easily performed.

Next, the welded portion 8 was formed by welding the base material 6 of the existing anticorrosion steel 5 around the entire periphery of the edge of the base plate 2 protruding from the peripheral edge of the titanium thin plate 3. Thereafter, an end surface of the titanium thin plate material 3, a protruding portion of the base plate material 2, and a region extending over the surface of the base steel material 6 are covered with a non-conductive sealing material 9.

The welding method used to form the welded joint 8 is as follows:
It is preferable to use any one of a fillet welding method using ultra-fine MIG, a lap welding method from the surface side of the base plate material 2 using a low-power laser, and a single-sided electrode seam welding method using indirect seam welding. The reason is as follows.

The base plate 2 having the above-mentioned thickness is made of a base steel 1
It is only about 1/5 to 1/10 times the thickness. For this reason,
Thin steel plates with a thickness of about 0.3 to 6 mm and a thickness of 6 mm
This is because, in the ordinary welding method used for welding and joining thick steel plates exceeding each other, only the base plate material 2 is melted, and welding and joining are difficult. In addition, since these welding methods have a small heat input, a range that adversely affects the anticorrosion coating 7 of the existing anticorrosion steel 5 can be minimized.

It is most preferable that the welded joint 8 is formed continuously over the entire periphery of the base plate 2 protruding from the peripheral edge of the titanium thin plate 3 as in the case of the welded joint 4 described above. It may be applied purposely.

The non-conductive sealing material 7 covers the end face of the titanium sheet material 3 (which may be a part of the front side surface), the protruding portion of the base sheet material 2 and the area extending over the surface of the base steel material 6. Is applied over the entire circumference of the application member 1 or 10. Thereby, the battery corrosion of the welded joint 8 between the base steel 6 of the existing anticorrosion steel 5 and the base plate 2 is prevented.

The sealing material 7 may be a silicone-based or modified silicone-based resin.

The planar shape and size of the repair members 1 and 10 are usually manufactured in advance at a factory in accordance with the shape and size of the anticorrosion film 7 which requires reinforcement or repair of the existing anticorrosion steel material 5. However, it may be manufactured on site.

According to the repairing method of the present invention, the repairing member 1 having excellent surface quality and having an anti-corrosion coating of the titanium thin plate 3 whose periphery is firmly welded to the existing anti-corrosion steel 5 is provided.
Or, by 10, reinforcement and repair of the anticorrosion coating 7 of the existing anticorrosion steel 5 can be easily performed. In addition, repair is MI
If a G welding machine or the like is brought in, it can be carried out at any place, and can be easily applied to existing anticorrosion steel materials 5 using steel materials of various shapes.

The joining strength of the repaired welded joint 8 for the repair member does not deteriorate over time and does not decrease.
The thin titanium plate material 3 does not peel off from the existing anticorrosion steel material 5. For this reason, after the fact, the repaired portion does not require regular reinforcement or repair, and is completely maintenance-free.

[0035]

According to the repair member for an existing corrosion-resistant steel material and the method for repairing an existing corrosion-resistant steel material using the same according to the present invention, the existing corrosion-resistant steel material is repaired while leaving the corrosion-resistant coating on the portion that needs to be reinforced or repaired. The surface can be easily covered completely with a titanium sheet material excellent in corrosion resistance and landscape.

The titanium sheet material coated on the existing anti-corrosion steel material is firmly welded to the base material of the existing anti-corrosion steel material via the base plate material. Is completely covered with the sealing material, so that the bonding strength does not deteriorate due to aging. For this reason, since the titanium sheet material does not peel off from the existing anticorrosion steel material, complete maintenance-free is achieved after the fact.

Further, the repair method according to the present invention is such that the repairing member of the present invention is laminated on an existing corrosion-resistant steel material, and the base plate material protruding from the peripheral edge of the titanium sheet material is welded to the base steel material of the existing corrosion-resistant steel material. However, since this is a very simple method of covering the welded joint with a non-conductive sealing material, it is possible to repair inexpensively and stably with little variation.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view illustrating an example of a repair member according to the present invention and an embodiment of a repair method thereof.

FIG. 2 is a partial cross-sectional view showing another example of the repairing member of the present invention and an embodiment of the repairing method.

FIG. 3 is a schematic perspective view showing an example of an existing anticorrosion steel material.

[Explanation of symbols]

1: repair member, 2: base plate, 3: titanium thin plate, 4: welded joint between base plate and titanium thin plate, 5: existing anticorrosion steel, 6: base steel, 7: anticorrosion coating, 8: Welded joint between base plate material and base steel material of existing anticorrosion steel material, 9: seal material, 10: repair member, 11: adhesive material (or adhesive material).

Claims (4)

[Claims] 1. A base plate made of pure nickel, pure iron or low carbon steel is laminated and arranged so as to protrude from a peripheral edge, and at least the vicinity of the edge of a titanium thin plate is welded to the base plate in advance. A member for repairing an existing anticorrosion steel material, characterized in that: 2. The member for repairing an existing corrosion-resistant steel material according to claim 1, wherein the base plate material is welded to only a peripheral portion of the titanium sheet material in advance. 3. The repairing member according to claim 1, wherein the repairing member according to claim 1 is used for repairing an existing anticorrosive steel material whose entire surface or a part thereof is covered with a rust-preventive paint, polyurethane or polyethylene sheet. The plate material side is placed on the front side, then the base plate portion protruding from the edge of the titanium thin plate material in the repair member is welded and joined to the existing base material of anticorrosion steel, and then the base plate is inserted from at least the end face of the titanium thin plate material. A method for repairing an existing anticorrosion steel material, wherein a region including a welded joint between a plate material and a base steel material of the existing anticorrosion steel material is covered with a non-conductive sealing material. 4. In the case where the repair member is the repair member according to claim 2, it is necessary to repair the existing anticorrosion steel material after applying an adhesive in advance to the back surface of the titanium sheet material having no base plate material. A method of repairing an existing anticorrosion steel material, wherein a repair member is disposed with the titanium sheet material side facing up in a portion to be used.