JP2000001832A - Reinforcing method of anti-corrosive coating of steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce the adhesion of an interface between an anti-corrosive coating layer consisting of an organic resin coating for corrosion-protecting a steel material used for marine environment and river environment and the steel material. SOLUTION: Rod-shaped bodies 1 having removable fixing members 3 at front ends and having a specified length are disposed in upright at at least two places of the surface 21 of the steel material 2 under the state in which the fixing members 3 are removed, and these rod-shaped bodies 1 are penetrated to at least an anti-corrosive coating layer 5 in the anti-corrosive coating layer 5 composed of an organic resin and a hold-down material 6 laminated on the surface 21 side of the steel material 2. The fixing members 3 are installed at the front ends of the penetrated rod-shaped bodies 1 so as to be brought into contact with the surface of the hold-down material 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a steel material used in a marine environment or a river environment, particularly to a method for reinforcing an organic resin coating.

[0002]

2. Description of the Related Art Steel materials used in marine and river environments include H-section steel, steel pipes, steel sheet piles, steel sheet piles, etc., earth retaining walls for landfills and river protection, river piers, It is used in many fields such as piers. And these steel materials are easily corroded because they are exposed to seawater and river water, and are usually treated for anticorrosion.
An anticorrosion method using an organic resin coating is often used.

[0003] As a method of coating the organic resin, there are heavy corrosion protection coating, resin lining, and the like. In each case, a base material such as blasting or chromate treatment is applied to the surface of the steel material, and then an undercoating organic resin is applied. In addition, this is a method of preventing corrosion by coating a thick anticorrosion coating layer such as paint or polyethylene on it, and at least two or more layers are laminated.

[0004]

However, if the organic resin is merely coated as described above, the adhesion between the steel material and the anticorrosion coating layer decreases over time, and the anticorrosion effect is lost. was there. As a countermeasure, a method in which a chromate treatment performed as a base treatment of a steel material is improved, for example, a method of adding a silane coupling material to a chromate treatment agent as described in JP-A-3-234527 is known. I have.

In this method, however, although it is possible to delay the decrease in the adhesion at the interface, it is possible to reduce the adhesion at the interface for about 50 years, which is the life in water of the polyethylene resin often used as an organic resin coating. It was difficult to keep.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a rod-like body having a predetermined length having a detachable fixing member provided at a tip thereof at at least two places on the surface of the steel material. Standing up in a state where the fixing member is removed in, while penetrating at least the anticorrosion coating layer out of the anticorrosion coating layer and the holding material made of organic resin laminated these rods on the surface side of the steel material,
The anticorrosion coating layer is reinforced by attaching the fixing member to the tip of the penetrated rod so as to be in contact with the surface of the pressing member.

[0007] According to this method, since the holding member and the anticorrosion coating layer are supported so as to sandwich the holding member and the anticorrosion coating layer with the steel material integrated with the rod-shaped body, the adhesion between the anticorrosion coating layer and the steel material is increased, and the anticorrosion coating layer is formed. Reinforced.

Further, in the above-mentioned method, by using welding or bonding means as means for erecting the rod on the surface of the steel material, the rod can be reliably erect.

Further, in the above method, the fixing member may be provided with a nut screwed on a male screw formed on the rod, a stop ring fitted on the tip of the rod, and a screw groove formed on the tip end surface of the rod. If the bolt is screwed, it can be easily and reliably attached to the rod-like body, and is excellent in workability.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. First, as shown in FIG.
A bolt-shaped rod-shaped body 1 having a predetermined length with an external thread 11 engraved on the peripheral surface is formed on the surface 2 of the steel material 2 by using various conventionally known welding means.
1 at least at two places. This standing is performed by fixing the flat lower end surface 12 of the rod-shaped body 1 to the surface 11 of the steel material 1 by a conventionally known welding means.

A fixing member 3 consisting of a nut is screwed on the tip of the rod-shaped body 1. It is preferable that the fixing member 3 is removed when the steel material 1 is erected on the surface 11 of the steel material 1.

Next, as shown in FIG. 1B, a resin sheet 4 containing an anticorrosive agent, an anticorrosive coating layer 5 made of an organic resin, and a pressing member 6 are laminated on the front surface 21 of the steel material 2. A through-hole 7 is formed at the standing position of the stacked bar 1, and the bar 1 erected on the surface 21 of the steel material 2 is inserted through the through-hole 7 and protrudes from the surface 61 of the holding member 6. The fixing member 3, which is a nut, is screwed to the male screw 11 of the rod-shaped body 1 on the surface 61 of the holding member 6 (see FIG. 1C).

The resin sheet 4 used here is, for example, a nonwoven fabric sheet impregnated with an anticorrosive such as petrolatum paste which is hardly denatured over a long period of time. The anticorrosion coating layer 5 is made of a polyolefin resin, a polyurethane resin, or the like.
Alternatively, an organic resin such as polyvinyl chloride is used, and the thickness is usually 1 mm or more.

The pressing member 6 is required to have a strong cross-sectional strength so that even if the plate thickness is small, it is difficult to bend, and a sufficient pressing force can be obtained even when the interval between the erected rods 1 is widened. Is done. Therefore, for example, those having an L-shaped cross section as shown in FIG. 2A, those having a U-shaped cross section as shown in FIGS. 2B and 2C, and those as shown in FIG. Section T
It is preferable to have a belt-like projection 62 like a letter-shaped one. The material is most preferably FRP having both strength and corrosion resistance, and the thickness is suitably about 0.5 to 7 mm. Also, stainless steel can be used, and in this case, the thickness is preferably about 0.1 to 3 mm. In any case, if the sheet thickness is too thin, the pressing material 6 is easily bent, so that the adhesion between the steel material 2 and the anticorrosion coating layer 5 is reduced. If the thickness is too thick, the rod-shaped body 1 must be lengthened. The material cost increases, and the length of the through hole 7 formed in the pressing member 6 is increased, which is disadvantageous in terms of workability.

The length of the holding member 6 is usually 15 cm.
As described above, in order to sufficiently hold down the anticorrosion coating layer 5, at least two or more rods are erected on one holding member 6.

As described above, in the present embodiment, the bar-shaped body 1 erected on the surface 21 of the steel material 2 is
The fixing member 3, which is a nut, is screwed onto the male screw 11 of the rod-shaped body 1 protruding from the surface 61 of the holding member 6. Accordingly, since the holding member 6, the anticorrosion coating layer 5, and the resin sheet are supported by the steel member 2 and the fixing member 3 integrated with the rod-shaped body 1 so as to sandwich them, the adhesion between them is increased, and the anticorrosion coating layer 5 is formed. Reinforced.

When the fixing member 3, which is a nut, is screwed onto the male screw 11 of the rod 1 on the surface 61 of the pressing member 6, the rod 1 and the fixing member 3 exposed on the surface of the pressing member 6 are made of steel or the like. If the corrosion resistance is poor as shown in FIG.
As shown in (C), the rod-shaped body 1 exposed on the surface of the holding member 6 by an adhesive layer 81 made of a cold-setting epoxy-based, urethane-based, or other organic resin-based adhesive.
In addition, the fixing member 3 is covered, and a cap 8 made of a sintered material such as an organic resin or porcelain is further placed on the fixing member 3 to prevent corrosion.

In this embodiment, the rod-shaped body 1 is erected on the surface 21 of the steel material 2 by welding means. In the case where a prefabricated factory or the like is installed in water as an earth retaining wall, a bridge pier, or the like. However, the present invention is also applicable to a case where an existing anticorrosion coating layer is formed by simply forming an anticorrosion coating layer made of an organic resin on the surface of a steel material. A part of the coating layer is peeled off to erect the rod-shaped body 1 and sandwich the resin sheet.

FIG. 3 shows a different embodiment of the present invention. The overall structure is almost the same as that of the above-described embodiment of the present invention, except that the rod 1 is attached to the surface 21 of the steel material 2. The difference is that the mounting means is adhesion. That is, the lower end surface of the rod-shaped body 1 and the surface 11 of the steel material 1 are adhered to each other by, for example, a cold-setting epoxy-based or urethane-based, α-cyanoacrylate-based, or other organic resin-based adhesive 9.

Therefore, since a large-scale welding machine, a power supply, and a high-pressure cylinder are not required as in the above-described embodiment, the operation is simple, and it is possible to carry out the operation sufficiently even at an existing site. In the present embodiment, the rod-shaped body 1
Since the wide adhesive plate 13 is continuously provided on the lower end surface of the, a large adhesive force can be exerted, and it can be reliably erected.

FIGS. 4 (A) and 4 (B) show still another embodiment of the present invention, in which there is a difference in the presence or absence of external thread formation on the peripheral surface of the rod-shaped body 1; In that a stop ring fitted to the rod-shaped body 1 is used.

As the fixing member 3 using this stop ring, for example, a circlip shown in FIG.
A conventionally well-known one such as a spring washer shown in FIG.

The present embodiment can provide substantially the same functions and effects as those of the above-described embodiments, but is particularly excellent in that the fixing member 3 can be fixed by one-touch without any special tool. .

FIG. 6 shows still another embodiment of the present invention. In this embodiment, the rod 1 has a threaded groove 15 formed on the tip end surface 14 thereof, and the fixing member 3 has The difference is that the bolt is screwed into the screw groove 15.

In particular, in the present embodiment, the surface 21 of the steel material 2
The resin sheet 4 containing an anticorrosive, the anticorrosive coating layer 5 made of an organic resin, and the pressing member 6 laminated on the side, the resin sheet 4 containing the anticorrosive, the through-hole 7 formed in the anticorrosive coating layer 5 made of an organic resin And a bolt-shaped fixing member 3 inserted into the rod-shaped body 1 having a predetermined length such that the tip surface 16 is flush with the surface 51 of the anticorrosion coating layer 5 and inserted from the surface side of the holding member 6. Is screwed to support the holding member 6 at a fixed distance from the surface 21 of the steel material 2 by the tip end surface 16 of the rod-shaped body 1 and the fixing member 3.

As described above, according to the present embodiment, since the anticorrosion coating layer 5 and the resin sheet 4 are held by the pressing member 6 supported at a predetermined distance from the surface 21 of the steel material 2, the anticorrosion coating layer 5 In addition to preventing the resin sheet 4 from peeling off from the surface 21 of the steel material 2, the anticorrosion effect can be reinforced, and even if the fixing member 3 is mistakenly screwed excessively during operation, the pressing member 6 is required. As described above, there is no fear that the pressing member 6 is bent and further damaged by being pressed against the steel material side.

[0028]

According to the reinforcing method of the present invention, the steel material integrated with the rod-shaped body and the fixing member support the holding member and the anticorrosion coating layer so as to sandwich them, so that the adhesion between the anticorrosion coating layer and the steel material is improved. The additional anticorrosion coating is reinforced.

Further, when welding or bonding means is used as means for erecting the rod on the surface of the steel material, the rod can be surely erected, and the fixing member has a male screw formed on the rod. In the case of a nut to be screwed into the rod, a stop ring fitted to the tip of the rod, and a bolt to be screwed into a thread groove formed in the tip surface of the rod, attachment to the rod is easy and reliable. Excellent workability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a step in a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a pressing member used in the present invention.

FIG. 3 is a cross-sectional view showing an example in which the means for erection of a rod is different from the embodiment shown in FIG. 1;

FIG. 4 is a cross-sectional view of another embodiment of the present invention.

FIG. 5 is a perspective view showing an example of a fixing member used in the embodiment shown in FIG. 4;

FIG. 6 is a sectional view of still another embodiment of the present invention.

[Explanation of symbols]

1 rod, 2 steel, 3 fixing member, 4 resin sheet, 5 anticorrosion coating layer, 6 holding material, 7 through hole.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisao Yamashita 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Corporation (72) Inventor Yoshiyuki Harada 20-1 Shintomi, Futtsu-shi, Chiba New Japan (72) Inventor Toyo Ando 6-19-13, Yawatadai, Kisarazu-shi, Chiba Prefecture (72) Inventor Akihiro Saito 2407-406, Futtsu, Futtsu-shi, Chiba Prefecture (72) Inventor, Yoshiyoshi Ono Chapter 8-10, Denon-chofu-minami, Ota-ku, Tokyo Japan Drive-it Corporation (72) Inventor Yusuke Tsumura 8-10, Denen-chofu-minami, Ota-ku, Tokyo F-term in Japan Driveit Corporation (reference) 2D018 BA00 4K044 AA02 AB03 AB10 BA21 BB03 BC02 BC04 CA07 CA31 CA53 CA67 CA71

Claims (6)

[Claims] 1. A bar having a predetermined length having a detachable fixing member at its tip is erected at at least two places on the surface of the steel material with the fixing member removed, and these rods are attached to the steel material. At least the anticorrosion coating layer of the organic resin laminated on the surface side and the holding material are penetrated, and the fixing member is brought into contact with the surface of the pressing material at the tip of the penetrated rod-shaped body. A method for reinforcing a corrosion-resistant coating on steel, characterized in that: 2. The method according to claim 1, wherein the rod is erected on the surface of the steel by welding means. 3. The method according to claim 1, wherein the rod-shaped body is erected on a surface of the steel material by an adhesive means. 4. The method according to claim 1, wherein said fixing member is a nut screwed onto a male screw formed on a peripheral surface of the rod. 5. The method according to claim 1, wherein said member is a stop ring fitted to the tip of a rod. 6. The method according to claim 1, wherein said fixing means is a bolt screwed into a screw groove formed in a tip end surface of the rod-shaped body.