JP2001011667A - Steel corrosion protective coating structure, and its execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the corrosion protective function through the degradation of the adhesion of a corrosion protective coating layer provided on the surface of steel used in a marine environment. SOLUTION: A hard holding material 4 is lapped on a corrosion protective coating layer 3 provided on the surface of steel 1, and a rivet 6 is driven in a piercing manner from a cup member 5 installed thereon to the steel 1 to closely attach these members. The head part of the rivet 6 projecting inside the cup member 5 is embedded in a corrosion protective filler 7 filled in the cup member 5, and shielded from seawater, etc., to prevent the degradation of the adhesion caused by the corrosion of the rivet 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrosion prevention of steel materials used mainly in marine and river environments, and more particularly to a corrosion protection coating structure provided on the surface of steel materials and a method of applying the same.

[0002]

2. Description of the Related Art Steel materials used in marine and river environments include H-section steel, steel pipes, steel pipe sheet piles, steel sheet piles, and many such as landfills, river retaining walls, port piers, and piers. Used in civil engineering and construction fields. Since these steel materials are exposed to seawater or river water and are easily corroded, it is widely used to provide an anticorrosive coating layer of an organic resin.

[0003] Corrosion protection of steel using an organic resin is performed by a heavy corrosion protection coating method or a resin lining method. In these methods, a base material is applied to the surface of a steel material and an undercoating organic resin is applied thereto. The anticorrosion coating layer of a required thickness made of an organic resin such as polyurethane or polyvinyl chloride is provided.

[0004] The anticorrosion coating layer is inevitably deteriorated over time even if the undercoat treatment is improved. If strong waves, tidal currents, or water currents collide with the portion where the adhesion force is reduced, the anticorrosion coating layer will not adhere. In addition to accelerated force reduction, peeling may occur, and there is a concern that the anticorrosive function may be lost.

As a countermeasure, a well-known tacking gun is used in which a holding material made of a hard material is layered on the anticorrosion coating layer and a tack is driven into concrete or the like by using the explosive gas pressure of explosive. Japanese Patent Application Laid-Open No. 10-1927 discloses a technique for reinforcing the adhesion of the anticorrosion coating layer to the steel material by driving the stud into the steel material by penetrating the pressing material and the anticorrosion coating layer.
No. 78 publication.

According to the technique described in the above publication, a steel material, an anticorrosion coating layer, and a pressing material are brought into close contact with each other by a stud which has been driven into them, thereby preventing aged deterioration of the adhesion force. Since it protrudes above the holding member, if exposed, it is corroded by seawater or the like, and if the corrosion progresses, the adhesive strength is reduced and the corrosion prevention function of steel is lost.

[0007] As a countermeasure, it is described in the above-mentioned publication that the protruding portion of the tack is covered with a cold-setting resin or a cap is covered to fill the gap with a cold-setting resin or an adhesive.

[0008]

Among the above-mentioned stud protruding portion protection means, those which are covered with a room-temperature-curable resin not only require a large amount of resin for mounting a resin in a flowing state, but also completely cover and hide. The work is troublesome because it is necessary,
It has the disadvantageous side. On the other hand, when the cap is covered and the space inside it is filled with a room-temperature-curable resin or adhesive, the filler is put into the cap and covered with the stud protruding part. Is difficult, and there is a case where a sufficient anticorrosion function cannot be obtained due to a shortage, or a case where an excessive amount flows out to the surroundings to cause waste.

According to the present invention, in order to reinforce the adhesion of the anticorrosion coating layer to the steel material by overlaying a hard pressing member on the anticorrosion coating layer and driving the studs through the hard pressure members until they penetrate the steel material, No problem is caused by using more resin or adhesive than necessary for the corrosion prevention treatment of the protruding part of the studs, and the protruding part is completely blocked from seawater etc. Is intended to be obtained.

[0010]

In order to solve the above-mentioned problems, the present invention provides an anticorrosion coating structure as follows. That is, a hard pressing member is superimposed on the anticorrosion coating layer provided on the surface of the steel material, and a bottom member is superposed on the pressing member, and a cup member is installed. The bottom wall of the cup member, the pressing member, and the anticorrosion coating are provided. These are made by embedding the heads of the tacks protruding inside the cup member into the anticorrosive filler filled in the cup member, with the studs being driven into the steel material by penetrating through the layer and sticking them together. It is.

In the present invention, the anticorrosion coating structure is constructed by the following construction method. One of them is to put a hard holding material on the anticorrosion coating layer provided on the surface of the steel material, put the cup member on the holding material with the bottom wall, and use the explosive gas pressure of explosive Using a rivet gun to penetrate the bottom wall of the cup member, the hold-down material, the anticorrosion coating layer, and driving the rivet until they penetrate the steel material, these are brought into close contact with each other, and the anticorrosive filler is filled in the cup member. The protruding portion is embedded in the inside of the cup member of the stud.

The other is to place a hard pressing member on the anticorrosion coating layer provided on the surface of the steel material, and to provide a cup-shaped waterproof cap at the tip of the barrel of a rivet gun utilizing explosive gas pressure of explosive. The rivet is fired in a state of being mounted and placed on the holding material, and the waterproof cap, the holding material, and the anticorrosion coating layer are brought into close contact with each other by being driven until they penetrate into the steel material, and the waterproof cap is attached to the cup member. And filling the protruding portion of the stud inside the cup member by using an anticorrosive filler.

As described above, the protruding portion of the stud is surrounded by the cup member in which the stud itself is brought into close contact with the pressing member, and the anticorrosive filler is filled therein, so that the anticorrosive filler is used more than necessary. The inconvenience that waste is generated or insufficient to prevent sufficient corrosion is eliminated, and the object of completely protecting the protruding portion of the stud and having a reliable anticorrosion function is achieved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. In FIG. 1, an anticorrosion coating layer 3 is superposed on the surface of a steel material 1 with a sheet 2 containing an anticorrosive agent interposed therebetween. A holding member 4 is placed on the coating layer 3, and a cup member 5 is placed on the holding member 4 with a bottom wall 51 placed thereon. Then, the rivet 6 is positioned on the central axis of the cup member 5, and the rivet 6 penetrates the bottom wall 51, the holding member 4, the anticorrosion coating layer 3, and the anticorrosion-containing sheet 2, and the tip reaches the inside of the steel material 1 sufficiently. The studs 6 are stacked in close contact with each other. Further, the protruding portion left without being driven by the stud 6 is located inside without protruding outside from the open surface of the cup member 5, and is embedded in the anticorrosive filler 7 filled in the cup member 5.

The steel material 1 is used or used in a marine environment or a river environment such as an H-section steel, a steel pipe, a steel sheet pile, a steel sheet pile, and the anticorrosion coating layer 3 is a polyolefin-based material.
It is made of an organic resin such as polyurethane or polyvinyl chloride, and generally has a thickness of 1 mm or more.

The anticorrosive-containing sheet 2 is preferably a nonwoven fabric impregnated with a petrolatum paste or a rust-preventive paste. The sheet 2 is sandwiched between the anticorrosion coating layer 3 and the steel material 1 at the installation site, and then the holding member 4, the cup member 5, the studs 6, and the anticorrosion filler 7 are applied, so that the anticorrosion effect is maintained for many months. Sustainable and used as needed. When the holding member 4, the cup member 5, the stud 6, and the anticorrosive filler 7 are applied at the factory before the installation, it is not always necessary to sandwich the anticorrosive-containing sheet 2.

Since the pressing member 4 presses the anticorrosion coating layer 3 against the steel material 1 with a strong force and adheres to the steel material 1, the pressing member 4 may have a sufficient rigidity even if it is a flat plate. However, it is preferable that the end surface is L-shaped or U-shaped so that the plate is hardly bent even when the plate thickness is small and a sufficient pressing force can be obtained with a small number of studs 6. did. Further, since the pressing member 4 is required to have both mechanical strength and corrosion resistance, it is preferable that the pressing member 4 be made of FRP or stainless steel. When made, the plate thickness is preferably 0.1 to 3 mm. Further, the pressing member 4 is generally 4 to 1
It has a width of 0 cm and a length of 50 to 100 cm.

The cup member 5 is made of a synthetic resin or rubber having elasticity and corrosion resistance, preferably ethylene propylene rubber. The cup member 5 has a diameter and a height capable of completely surrounding the projecting portion of the stud 6,
It is preferable that the bottom wall 51 has a thickness of 1 to 3 mm and the peripheral wall 52 has a thickness of 2 to 5 mm.

As the anticorrosive filler 7, an epoxy-based, polyurethane-based cold-setting resin or an α-cyanoacrylate-based adhesive is used.

The rivet 6 is formed by using a rivet gun that is commonly used to drive rivets into concrete or steel using the explosive gas pressure of an explosive to fasten members to their surfaces.
1, the holding member 4, the anticorrosive coating layer 3, and the anticorrosive agent-containing sheet 2 are penetrated into the steel material 1.

In the illustrated embodiment, a stud 6 having a conical enlarged portion 62 at the base end of a shaft 61 having a sharp tip and a head 63 at the base is used. Further, a metal holder 64 having a dish-shaped spring shape and having the same diameter as the head portion 63 is fitted to and held by the shaft portion 61 so as to be mounted on the barrel of the stapling gun with the center axis aligned. .

When the stud 6 is driven in, the periphery of the holder 64 is strongly pressed against the bottom wall 51 of the cup member 5 by the enlarged diameter portion 62, and the tip of the shaft portion 61 bites into the steel material 1 and is fixed. By this, the bottom wall 51, the pressing member 4, the anticorrosive coating layer 3, the anticorrosive-containing sheet 2, and the steel 1 are brought into close contact with each other. At least two studs 6 are used for one holding member 4 depending on the size.

When the shaft 61 is used as the stud 6 and the holder 64 is made of synthetic resin, the head 63 is driven into a state in which the head 63 hits the bottom wall 51 and is strongly pressed. In either case, the elastic force of the cup member 5 allows the cup member 5 to adhere to the pressing member 4 and the stud 6 without forming a gap therebetween, thereby providing excellent watertightness.

The anticorrosive filler 7 can be filled into the cup member 5 opened to the outside while visually observing it directly, so that the projecting portion of the stud 6 can be extremely easily and completely formed without any excess or shortage. Can be embedded in

FIGS. 2 and 3 are schematic views showing different embodiments of the procedure for constructing the anticorrosion coating structure shown in the above embodiment.

First, the construction procedure shown in FIG. 2 will be described. As shown in FIG. 2 (A), at a predetermined position on the anticorrosion coating layer 3 superposed on the surface of the steel material 1 with the anticorrosion agent-containing sheet 2 interposed therebetween. The holding member 4 is placed on the holding member 4, and the cup member 5 is further stacked on a predetermined portion of the holding member 4. The stud 6 is mounted at the tip of the barrel 81 of the stud gun 8. When the stud 6 is to be constructed underwater, the barrel 8 is designed to prevent water from entering the inside of the stud 8.
One end is closed by a film-like sealing material 82. The holding member 4 and the cup member 5 are held by a worker until the tip of the barrel 81 is inserted into the cup member 5 and pressed toward the steel member 1, or the cup member 5 is held on the holding member 4. The worker may hold only the pressing member 4 by temporary bonding.

When the pressing member 4 and the cup member 5 are set at predetermined positions by the above-described procedure, the tip of the barrel 81 of the stud gun 8 is inserted into the cup member 5 as shown in FIG. The studs 6 are fired by the explosive gas pressure of the explosive, and the cup member 5, the pressing member 4, the anticorrosive coating layer 3, the anticorrosive-containing sheet 2, and the steel material 1 are brought into close contact with each other. Then, as shown in FIG. 2C, the cup member 5 is filled with the anticorrosive filler 7, and the operation is completed.

Next, the work procedure shown in FIG. 3 will be described. As shown in FIG. 3A, a predetermined position on the anticorrosion coating layer 3 superposed on the surface of the steel material 1 with the anticorrosion agent-containing sheet 2 interposed therebetween. Put the holding material 4 on. On the other hand, a tacking gun 8 loaded with a tack 6
A cup-shaped waterproof cap 83 is fitted to the tip of the barrel 81 in a water-tight manner so that water does not enter the inside of the tacking gun 8 underwater.

The tip of the barrel 81 of the above-mentioned rivet gun 8 is shown in FIG.
As shown in (B), with the waterproof cap 83 attached, the pressing member 4 is pressed firmly against the pressing member 4 and the rivet 6 is fired and driven by the explosive gas pressure of the explosive, thereby separating the barrel 81 from the pressing member 4. The waterproof cap 83 is left in a state in which the waterproof cap 83 is in close contact with the pressing member 4 with the studs 6, and this becomes the cup member 5 as shown in FIG.

The cup member 6 with the waterproof cap 83 turned, the pressing member 4, the waterproof coating layer 3, the anticorrosive-containing sheet 2,
The steel material 1 is adhered to each other by the studs 6, and the anticorrosive filler 7 is filled in the cup member 5 as shown in FIG.

According to the embodiment shown in FIG. 3, since the waterproof cap 83 and the cup member 6 are also used, the number of parts to be used may be small, and the installation of the cup member 6 on the pressing member 4 may be performed by pressing. Since the operations are performed at the same time, there is an advantage that the operation is simplified. Note that this embodiment is not limited to construction in water, and the work procedure in the factory can be simplified by attaching the cup member 6 to the tip of the barrel 81.

[0032]

As described above, according to the present invention, the projecting portion of the stud for mechanically maintaining the adhesion between the anticorrosion coating layer and the steel material is completely embedded with an appropriate amount of anticorrosion filler, and completely protected from seawater or the like. It is possible to provide a reliable anti-corrosion coating structure which does not cause a decrease in adhesion due to corrosion of the tack by breaking.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an embodiment of an anticorrosion coating structure according to the present invention.

FIG. 2 is a schematic diagram illustrating an embodiment of a construction procedure for constructing the anticorrosion coating structure according to the present invention.

FIG. 3 is a schematic diagram illustrating an embodiment having different construction procedures.

[Explanation of symbols]

Reference Signs List 1 steel material, 3 anticorrosive coating layer, 4 holding material, 5 cup member, 6 tack, 7 anticorrosive filler, 8 tack gun, 81 barrel, 83 waterproof cap,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Endo 1 Kimitsu, Kimitsu City, Chiba Prefecture Inside the Corrosion Protection Technology Center of Nippon Steel Corp. (72) Inventor Akihiro Saito 2-11-9 Iwamotocho, Chiyoda-ku, Tokyo Nippon Steel Corrosion Protection Co., Ltd. (72) Inventor Yoshiaki Ono 8-10 Denen Chofu Minami, Ota-ku, Tokyo Japan Drive-it Corporation (72) Yusuke Tsumura 8-10 Denen Chofu Minami, Ota-ku, Tokyo F-term in Nippon Drive-it Corporation (reference) 4K062 AA05 BC07 BC12 BC15 EA11 EA14 FA01 FA12 FA18 GA01

Claims (5)

[Claims] 1. A hard pressing member is superimposed on an anticorrosion coating layer provided on a surface of a steel material, and a cup member is installed with a bottom wall superimposed on the pressing member, and a bottom of the cup member is provided. These are adhered to each other by a stud which has been driven into the steel material through the wall, the holding member, the anticorrosion coating layer and penetrated into the steel material, and the head of the stud protrudes inside the cup member, and An anticorrosion coating structure made of steel, which is embedded in an anticorrosion filler filled in a cup member. 2. A method in which a hard pressing member is superimposed on an anticorrosive coating layer provided on a surface of a steel material, a cup member is superimposed on a bottom wall of the pressing member, and an explosive gas pressure of explosive is reduced. The bottom wall of the cup member using a tacking gun to be used,
Pressing material and the studs are brought into close contact with each other by driving a stud until the steel material is penetrated through the holding material and the anticorrosion coating layer. The cup member is filled with an anticorrosive filler and the studs protrude into the cup member. A method for constructing an anticorrosion coating structure made of steel, characterized by embedding a part. 3. A hard presser is superimposed on an anticorrosion coating layer provided on a surface of a steel material, and a cup-shaped waterproof cap is attached to a tip end of a rivet gun using explosive gas pressure of explosive. A tack is fired in a state of being stacked on the holding member, and the waterproof cap, the holding member, and the anticorrosion coating layer are punched into the steel by being driven into the steel material so that they are in close contact with each other. A method for constructing an anticorrosion coating structure of steel, comprising: filling a member with an anticorrosion filler and embedding a portion of the stud protruding inside the cup member. 4. The structure according to claim 1, wherein said cup member is made of ethylene propylene rubber. 5. The anticorrosion coating structure for a steel material according to claim 1, 2 or 3, wherein the anticorrosion filler is a room temperature curing resin.