JPH0441180Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a sacrificial anode for corrosion protection on the bottom plate of a tank such as a crude oil tanker.

``Prior Art'' Conventionally, as a means for electrochemically preventing corrosion of a metal body by an electrolytic solution, a sacrificial anode (current anode) made of zinc or aluminum alloy or the like is attached to a metal body to be protected from corrosion.

An example of a conventional sacrificial anode will be explained with reference to FIGS. 5 and 6.

As shown in FIGS. 5 and 6, a conventional sacrificial anode includes a sacrificial anode main body 1 having a rectangular cross section and a required length, and a core buried inside the sacrificial anode main body 1 in the longitudinal direction. It consists of a metal 2 and mounting leg plates 3 which are provided to protrude vertically from the front and rear of the core metal 2 to the outside of the lower surface of the sacrificial anode main body 1, respectively.

Note that the core metal 2 and the mounting leg plate 3 are made of steel,
An attachment leg plate 3 is welded to the core metal 2 in advance, and when the sacrificial anode body 1 is cast, the core metal 2 having the attachment leg plate 3 is cast into the sacrificial anode body 1 to form a sacrificial anode.

In order to install the conventional sacrificial anode for corrosion protection on a tank bottom plate, as shown in FIG. The sacrificial anode main body 1 is placed through a predetermined holding jig (not shown) so that the longitudinal direction of the lower surface of the sacrificial anode body 1 is in the lateral direction of the web 6a surface of the reinforcing vertical member 6 in the tank 4. The lower end of the mounting leg plate 3 is attached to the lower part of the web 6a surface of the reinforcing vertical member 6 by fillet welding.

"Problem to be solved by the invention" By the way, as mentioned above, the mounting leg plate 3 of the sacrificial anode main body 1 is attached to the lower part of the web 6a surface of the reinforcing vertical member 6.
When the lower end is attached by fillet welding, fillet welding can only be performed on one plate surface that is the upper surface of the mounting leg plate 3 and the web 6a surface of the reinforcing vertical member 6, which reduces welding strength and durability. There was a problem with poor vibration performance.

The object of the present invention is to provide a sacrificial anode for corrosion protection of a tank bottom plate, which solves the above-mentioned conventional problems.

"Means for Solving the Problems" The gist of the sacrificial anode for tank bottom plate corrosion protection according to the present invention is to provide a sacrificial anode body with a rectangular cross section having a required length, and an internal longitudinal length of the sacrificial anode body. In a sacrificial anode for metal corrosion protection consisting of a core metal buried in the direction of the metal core, and mounting leg plates provided vertically protruding from the front and rear of the core metal to the outside of the lower surface of the sacrificial anode main body, one of the mounting leg plates is provided. The reason is that a welding plate is provided at right angles to the lower half of the side end surface.

"Function" As mentioned above, there is a sacrificial anode main body with a rectangular cross section having a required length, a core metal buried in the longitudinal direction inside this sacrificial anode main body, and a metal core that is perpendicular to the front and rear sides of the core metal. In a sacrificial anode for metal corrosion protection consisting of a mounting leg plate protruding outward from the lower surface of the sacrificial anode body, a welding plate is provided at right angles to the lower half of one side end surface of each of the mounting leg plates, so that the sacrificial anode By placing the sacrificial anode body on the top surface of the bottom plate of the tank with the top surface of the main body facing downward and leaving a flow gap for sludge discharge via a predetermined holding jig, the welding plate on each mounting leg plate is removed. can be brought into contact along the longitudinal direction of the web surface of the reinforcing vertical member in the tank, and therefore both plate surfaces of the welding plate on each mounting leg plate and the web surface of the reinforcing vertical member can be brought into contact with each other along the longitudinal direction. Can be fillet welded.

"Example" Next, an example of the sacrificial anode for tank bottom plate corrosion protection according to the present invention will be described below with reference to FIGS. 1 to 3.

As shown in Figures 1 and 2, the sacrificial anode for tank bottom plate corrosion protection according to the present invention has a rectangular cross section with a required length, and a height of 10 to 20 mm at the four corners of the upper surface.
A sacrificial anode main body 1 having a protrusion 1a of about 100 degrees, a core metal 2 embedded in the internal longitudinal direction of this sacrificial anode main body 1, and a lower surface external part of the sacrificial anode main body 1 extending vertically from the front and rear of the core metal 2, respectively. It consists of a mounting leg plate 3 provided so as to protrude from the mounting leg plate 3, and a welding plate 3a provided perpendicularly to the lower half of one side end surface of each of the mounting leg plates 3.

In order to attach the sacrificial anode according to the present invention for corrosion protection on a tank bottom plate, as shown in FIG. , the sacrificial anode body 1 is placed on the top surface of the bottom plate 5 in the tank 4,
The sludge can be placed with a flow gap g for discharging the sludge, and the side end surface of the welding plate 3a of each mounting leg plate 3 can be placed along the longitudinal direction of the web surface 6a of the reinforcing vertical member 6 in the tank 4. The welding plates 3 on each mounting leg plate 3 can abut and thus
It is possible to perform fillet welding between both plate surfaces of a and the web surface 6a of the reinforcing vertical member 6 without using a predetermined holding jig.

Note that projections 1a are provided at the four corners of the upper surface of the sacrificial anode body 1.
If not, the sacrificial anode main body 1 may be placed on the upper surface of the bottom plate 5 of the tank 4 via a predetermined holding jig.

Furthermore, in order to attach the sacrificial anode according to the present invention for corrosion protection to the reinforcing vertical member 6 in the tank 4, as shown in FIG. The lower end surfaces of the plates 3a may be brought into contact with each other, and both plate surfaces of the mounting leg plate 3 and the welding plate 3a and the upper surface of the upper flange 6b of the reinforcing vertical member 6 may be fillet welded.

"Effects of the Invention" As described above, the present invention consists of a sacrificial anode main body having a rectangular cross section and a required length, a core bar buried in the longitudinal direction inside the sacrificial anode main body, and a core bar embedded in the interior of the sacrificial anode body in the longitudinal direction. In a sacrificial anode for metal corrosion protection, a welding plate is provided at right angles to the lower half of one side end surface of each of the mounting leg plates. With the top surface of the sacrificial anode body facing downward, the sacrificial anode body is placed on the top surface of the bottom plate of the tank using a predetermined holding jig, leaving a flow gap for sludge discharge. The side end surfaces of the welding plates on the mounting leg plates can be brought into contact along the longitudinal direction of the web surface of the reinforcing vertical members in the tank, so that both plate surfaces of the welding plates on each mounting leg plate and the reinforcing vertical members Since the web surface of the member can be fillet welded, welding strength and vibration resistance can be improved.

Further, when projections are provided at the four corners of the upper surface of the sacrificial anode body, the sacrificial anode body can be placed on the upper surface of the bottom plate of the tank without using a predetermined holding jig.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the sacrificial anode according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. FIG. 4 is an explanatory diagram of the sacrificial anode according to the present invention installed for corrosion protection of a reinforcing vertical member of a tank; FIG. 5 is a side view of a conventional sacrificial anode; FIG. 6 is a cross-sectional view taken along the line A--A in FIG. 5, and FIG. 7 is an explanatory diagram showing a case where a conventional sacrificial anode is attached to a tank bottom plate for corrosion protection. 1...Sacrificial anode main body, 1a...Protrusion, 2...Core metal, 3...Mounting leg plate, 3a...Welding plate, 4...
Tank, 5...bottom plate, 6...vertical reinforcing member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sacrificial anode body with a rectangular cross section having a required length, a core bar embedded in the longitudinal direction of the sacrificial anode body, and the front and back of this core bar. In the sacrificial anode for metal corrosion protection, the metal corrosion protection sacrificial anode is comprised of mounting leg plates provided perpendicularly to the outside of the lower surface of the sacrificial anode main body, and a welding plate is provided at right angles to the lower half of one side end face of each of the mounting leg plates. A sacrificial anode for tank bottom plate corrosion protection. (2) A sacrificial anode main body with a rectangular cross section having a required length, a core metal embedded in the internal longitudinal direction of the sacrificial anode main body, and a sacrificial anode main body vertically extending from the front and rear of the core metal, respectively. A sacrificial anode for metal corrosion protection consisting of mounting leg plates protruding to the outside of the lower surface, wherein a welding plate is provided at right angles to the lower half of one side end surface of each of the mounting leg plates, and the four corners of the upper surface of the sacrificial anode body A sacrificial anode for corrosion protection on a tank bottom plate, characterized by having protrusions on the bottom of the tank.