JP2565929Y2 - Electro-corrosion protection device for steel tank inner surface - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion device for an inner surface of a steel tank such as a crude oil storage tank or a tanker.

[0002]

2. Description of the Related Art Heretofore, an anticorrosion device for an inner surface of a steel vessel has a current-carrying anode body having a required length and a rectangular cross section, and is buried in the longitudinal direction inside the current-carrying anode body. A core bar, mounting leg plates vertically protruding from the front and rear portions of the core bar to the outside of the lower surface of the galvanic anode body, and welding at right angles to the lower half of one side end surface of each mounting leg plate. A galvanic anode consisting of a plate was used, the galvanic anode body was mounted on the upper surface of the bottom plate of a steel tank, and the welding plate was welded to a bottom flange of the steel tank (actually disclosed in Japanese Unexamined Utility Model Publication No. 17
No. 3159).

[0003]

However, the conventional galvanic anode body is heavy and has poor workability. The galvanic anode body is placed on the upper surface of the bottom plate of a steel tank, and the welding plate is When the galvanic anode body is worn due to welding to the bottom flange, a gap is formed between the upper surface of the bottom plate of the steel tank and the galvanic anode body, and there is a problem that an effective anticorrosive current is difficult to flow.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the gist of the invention is that a lower edge is provided on the upper surface of the bottom plate of the steel tank and at the center of the plate surface. A reaction force receiving bracket having an open horizontally long cutout hole is welded, and a grooved steel presser fitting with a reaction force imparting bolt screwed into the center of the web at right angles to the horizontally long cutout hole of the reaction force receiving bracket. The flanges of the channel-shaped steel presser fittings are respectively brought into contact with the upper surface of the end portion of the galvanic anode plate laid opposite to the upper surface of the bottom plate of the steel tank with the reaction force receiving bracket as the center. There is provided a cathodic protection device for an inner surface of a steel tank in which a reaction force applying bolt head is brought into contact with a lower surface of an upper edge of a horizontally long cutout hole of the reaction force receiving bracket by screwing back the application bolt.

[0005]

According to the device of the present invention, the galvanic anode plate is laid on the upper surface of the bottom plate of the steel tank, so that the weight is lighter than the conventional galvanic anode body having a rectangular cross section, so that workability is improved. Less uneven wear and operation of the reaction force applying bolts allows the countercurrently laid anode plates to be simultaneously fixed to the upper surface of the bottom plate of the steel tank via the channel steel presser fittings. It is extremely easy to electrically connect and fix the galvanic anode plate, and even when the galvanic anode plate is worn down and thin, the galvanic anode plate can be in close contact with the upper surface of the bottom plate of the steel tank. Thus, an effective anticorrosion current can always be passed.

[0006]

1 and 2 show a first embodiment of the present invention, in which a horizontally long cutout hole 2a having an open lower edge is provided at the center of the bottom surface of a bottom plate 1 of a steel tank. The reaction force receiving metal fitting 2 is welded, and the grooved steel press metal fitting 3 in which the reaction force applying bolt 4 is screwed into the center of the web 3a at right angles to the horizontally long cutout hole 2a of the reaction force receiving metal fitting 2 is provided. The flanges 3b on both sides of the channel-shaped steel presser fitting 3 are respectively inserted on the upper surface of the end portion of the galvanic anode plate 5 which is inserted so as to face the upper surface of the bottom plate 1 of the steel tank centering on the reaction force receiving bracket 2. By contacting and retreating the reaction force applying bolt 4, the head of the reaction force applying bolt 4 is brought into contact with the lower surface of the upper edge of the horizontally long cutout hole 2 a of the reaction force receiving bracket 2, and the pressed groove shape is lowered. Flanges on both sides of steel presser fitting 3
Through 3b, the galvanic anode plates 5 laid opposite to each other can be fixed to the upper surface of the bottom plate 1 of the steel tank together with electrical conduction.

FIG. 3 shows a second embodiment of the present invention, in which the reaction force applying bolt is provided at the bolt head, at the upper side of the lateral edge cutout hole 2a of the reaction force receiving bracket 2 at both sides. Using a so-called wing bolt 14 having a locking detent wing piece 14a,
The nut 6 is screwed into the wing bolt 14, and the lower end of the wing bolt 14 is made to pass through the center of the web 3 b of the channel-shaped steel presser fitting 3, and the horizontally elongated notch 2
After setting the channel steel presser fitting 3 in a, the wing bolt 14
To a certain extent, the detent wing pieces 14a are engaged with both upper side surfaces of the horizontally long cutout hole 2a of the reaction force receiving bracket 2, and then the nut 6 is operated to retreat the wing bolt 14. The head is brought into contact with the lower surface of the upper edge of the horizontally elongated cutout hole 2a of the reaction force receiving bracket 2.

FIG. 4 shows a third embodiment of the present invention, wherein the reaction force receiving bracket is a bottom flange 12 in a steel tank, and the horizontally elongated cutout hole is a horizontally elongated drain. The rest of the hole 12a is the same as the second embodiment shown in FIG. In each of the embodiments, insulating coating 7 is applied to the upper surface of the galvanic anode plate 5 around the flanges 3b on both sides of the channel-shaped steel presser fitting 3 to prevent the galvanic anode plate 5 around the flanges 3b from being worn out early. I do. In each of the embodiments, when the bottom plate is regarded as the side wall, the side wall can also be subjected to cathodic protection at the same time.

As described above, the upper surface of the galvanic anode plate 5 around the flanges 3b on both sides of the channel-shaped steel presser fitting 3 is coated with an insulating coating 7 on the upper surface.
However, this is applied to a new steel tank, and when there is residual water (bilge) on the bottom plate as in a pre-made steel tank, an insulating coating 7 is applied. In this case, as shown in FIG. 5, a required large current carrying anode plate piece 8 having an insulating coating 7 previously applied to its upper surface, as shown in FIG.
Is interposed between the flanges 3b on both sides and the galvanic anode plate 5.

[0010]

According to the present invention, the galvanic anode plate is laid on the upper surface of the bottom plate of the steel tank, so that it is lighter in weight than the conventional rectangular cross-sectional galvanic anode body, so that workability is good. The non-uniform wear is also small, and by simply operating the reaction force applying bolt, the countercurrent anodic plate
Since it can be fixed to the upper surface of the bottom plate of the steel tank at the same time via the channel-shaped steel retainer, it is extremely easy to electrically connect and fix the galvanic anode plate, and the galvanic anode plate is worn out. Even when it becomes thin, the galvanic anode plate can be brought into close contact with the upper surface of the bottom plate of the steel tank, and an effective anticorrosion current can always flow.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate of steel tank 2 Reaction force receiving bracket 12 Bottom longitudinal 2a Horizontal cutout hole 12a Drain hole 3 Channel shaped steel holding bracket 3b Both side flanges 4 Reaction force applying bolt 14 Reaction force applying wing bolt 5 Electrolytic anode plate 6 Nut 7 Insulation coating 8 Current anode plate piece

Claims (3)

(57) [Scope of request for utility model registration] Claims: 1. A reaction force receiving bracket having a horizontally long cutout opening with a lower edge opened at the center of a plate surface is welded to an upper surface of a bottom plate of a steel tank,
At right angles to the horizontally elongated cutout holes of this reaction force receiving bracket, a grooved steel press fitting into which a reaction force applying bolt is screwed is inserted into the center of the web, and the steel tank is centered on the reaction force receiving bracket. By contacting the flanges on both sides of the channel-shaped steel presser fitting on the upper surface of the end of the galvanic anode plate laid opposite to the upper surface of the bottom plate, and screwing back the reaction force applying bolt, the reaction force applying bolt head An anticorrosion device for an inner surface of a steel tank, which is brought into contact with a lower surface of an upper edge of a horizontally elongated cutout hole of a reaction force receiving bracket. 2. A bolt having a detent wing on a bolt head, which is engaged with both upper side surfaces of a horizontally long cutout hole of the reaction receiving bracket, as the reaction applying bolt, and a nut is used as the bolt. The corrosion prevention device for an inner surface of a steel tank according to claim 1, wherein the lower end of the bolt is penetrated through the center of the web of the channel-shaped steel presser fitting. 3. The steel tank inner surface according to claim 1, wherein the reaction force receiving bracket is a bottom flange in a steel tank, and the horizontally long cutout hole is a horizontally long drain hole. Cathodic protection device.