KR20130095101A - Cathodic protection apparatus for vessel - Google Patents

Abstract

PURPOSE: A cathodic protection apparatus for a vessel is provided to maintain the gap between an anti-corrosion block and the bottom surface of a vessel body by unfolding a foldable support. CONSTITUTION: A cathodic protection apparatus (P) for a vessel comprises a vessel body (10), an anti-corrosion block, and foldable supports. The anti-corrosion block is composed of a metal material having higher electronegativity than the vessel body. The foldable supports are arranged on both sides of the anti-corrosion block to control the vertical gap between the anti-corrosion block and the bottom surface of the vessel body. Each of the foldable supports comprises a connection supports, lower supports, and upper supports. The connection support is coupled to the anti-corrosion block. The lower supports are extended from both sides of the connection support. The upper supports are coupled to the ends of the lower supports to be foldable and are fixed to the bottom surface of the vessel body.

Description

Ship anticorrosive device {CATHODIC PROTECTION APPARATUS FOR VESSEL}

The present invention relates to a marine anticorrosive device, and more particularly, to a marine anticorrosive device for preventing corrosion from being promoted by static electricity generated by friction with seawater, that is, anticorrosive.

In general, floating liquefied natural gas installations are known as superstructures or ships capable of producing, storing and unloading while floating at sea, as well known as floating production, storage and offloading (FPSO).

In such super-large vessels, hundreds of fixed-type structures are installed where the base or manner of the vessel is required.

In order to prevent the corrosion of the ship is promoted by the generation of static electricity by friction with sea water, there are known various types of fixed type structure for fixing to the outer surface of the ship to prevent corrosion.

For example, the temporary sacrificial anode structure for preventing corrosion of a vessel disclosed in Patent Document 1, which is the background of the invention, has a zinc plate 1 covered with a rubber plate 2 on the side in contact with the hull 4 and a steel plate fixed to the zinc plate 1. The end portions 3a and 3b of the liver 3 are embedded so as to be exposed to the outside, and the end portions 3a and 3b are configured to be fixed to the ship body 4 of the ship by the welding section 5.

However, in the temporary sacrificial anode structure for preventing corrosion of ships in Patent Document 1, since the rubber plate 2 is blocked between the hull 4 and the zinc plate 1, seawater flows in through the gap between the rubber plate 2 and the hull 4. This has the disadvantage that the hull 4 above the vertical of the rubber plate 2 may be corroded.

In addition, since the thickness of the rubber plate 2 is so small that the zinc plate 1 is too close to the hull 4, there is a disadvantage that the anticorrosive effect is inferior. That is, generally, it is known that the proper effect should be maintained between the zinc plate 1 and the hull 4 so as to maximize the anticorrosive effect and thus exhibit the optimum efficiency.

In addition, a temporary sacrificial anode structure for preventing corrosion of a vessel of Patent Document 2, which is the background of the present invention, has disclosed a fixed type structure in which two supporting rods protrude from the bottom of the sacrificial anode.

However, the sacrificial anode of the prior art of Patent Literature 2 causes a problem that drafts are not secured when a large vessel such as FPSO is launched in a limited dock due to the length of the support rod.

For example, the dock is 11 meters high, the reference depth for launching is 7 meters, the distance from the reference depth to the bottom of the hull is 4.7 meters, and the keel lumber placed within the dock to support the bottom of the hull is 1.8. In the case of meters, only 500 mm of clearance exists between the bottom of the hull and the top of the keel lumber for launching the ship.

That is, when the sacrificial anode of the prior art of Patent Document 2 is to be applied to a super-large vessel such as FPSO, the up and down distance between the bottom and the bottom of the sacrificial anode supported by the supporting rod is 500 mm or less, but ship propagation is possible. As mentioned above, when the distance between the sacrificial anode and the bottom of the ship is not included in the range of 350 to 500 mm, there is a disadvantage in that the optimum anticorrosive efficiency is not exhibited.

Patent Publication No. 10-2010-0085556, FIG. 2 Utility Model Registration No. 20-0180451, Fig. 4

An embodiment of the present invention is to solve the above-mentioned problems, by combining the anticorrosive block to the folding support, the anticorrosive device for a ship that can prevent the anticorrosive block caught on the keel lumber in the dock causing interference To provide.

In addition, according to another embodiment of the present invention, the anticorrosive block may be semi-automatically rotated by using the washer portion having the hydrolysis surface layer of the washer portion and the anticorrosive block, and locked to maintain a fixed state after the rotary drop. It is further provided to provide a marine anticorrosive device that can further reduce the work to unfold the folding support to the original state by the underwater operation of the diver after launching the vessel.

According to an aspect of the present invention, the hull and the anticorrosive block made of a metal of a material having a relatively large electrical voice compared to the hull, and the anticorrosive block to adjust the vertical gap between the anticorrosive block and the bottom of the hull, Vessel anticorrosion apparatus comprising a foldable support disposed on both sides of the can be provided.

In addition, the foldable support is connected to the folding support coupled to the anticorrosive block, the lower support extending at right angles from both sides of the connection support, and foldable or foldable through the end and the hinge of the lower support, It may include an upper support is fixed to the bottom surface of the hull.

In addition, the hinge portion may include a bolt and nut combination fastened to the through hole of the overlapping portion of the lower support and the upper support.

The hinge part may further include a washer part interposed between the hinge part and the lower support part and the upper support part, wherein the washer part is formed of a stainless steel material resistant to corrosion, and has a ring shape and is laminated to the outside of the core part. A water dissociable surface layer may be included.

In addition, between the spring seating hole inserted into the spring seating hole of the inner portion of the upper end of the lower support and the spring seating hole and the pin hole of the upper support as it moves along the spring seating hole using the elastic force of the spring. The locking unit may further include a locking pin that is locked.

In addition, the end portion of the fixing pin inserted into the pin hole may be formed in a hemispherical shape.

In the embodiment of the present invention, even when the clearance between the bottom of the hull and the top of the keel lumber is very narrow as 500 mm, when the launch of a large vessel such as FPSO is very narrow, by folding the folding support close to the bottom of the ship, By allowing the anticorrosive block to be placed inside, it is possible to realize normal ship launching work and to maintain the gap between the anticorrosive block and the bottom of the ship to achieve the optimal anticorrosive efficiency by opening the folding support folded after launching. There is this.

Further, another embodiment of the present invention uses the principle that the water dissociable surface layer formed on the outside of the core of the washer melts when the washer portion coupled to the folding support is exposed to water after launching, and uses the weight of the corrosion block, which is relatively heavy. By expanding the folding support in a straight line, there is an advantage that can eliminate the underwater work of the diver after launching the ship.

In addition, another embodiment of the present invention has an advantage that the folding support can be stably suspended in the anti-corrosive block when moving the vessel provided with a locking portion for fixing the upper support and the lower support of the foldable support when it is unfolded in a straight line. .

1 is a cross-sectional view of a temporary sacrificial anode structure for preventing corrosion of ships according to the prior art.
2 is a layout view showing a state in which the anticorrosive apparatus for a ship according to the first embodiment of the present invention is installed on the bottom of the ship.
3 is a front view of the marine anticorrosive device shown in FIG.
FIG. 4 is a side view for explaining an operation relationship of the marine anticorrosive apparatus shown in FIG. 3.
5 and 6 are schematic diagrams for explaining the launching process of a vessel having a marine vessel apparatus shown in FIG.
7 is a front view of a marine anticorrosion apparatus according to a second embodiment of the present invention.
FIG. 8 is a side view for explaining an operation relationship of the marine anticorrosive apparatus shown in FIG. 7.
9 is a cross-sectional view of the line AA shown in FIG. 8.
10 is a cross-sectional view of the line BB shown in FIG. 8.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the following description of the present invention, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted, and similar or identical configurations may be used in the embodiments. Reference numerals may be used.

First Embodiment

2 is a layout view showing a state in which the anticorrosive apparatus for a ship according to the first embodiment of the present invention is installed on the bottom of the ship.

As shown in Figure 2, the marine anticorrosive device (P) of the present invention may be attached to the position of the hull 10 is required in a superstructure or a vessel such as FPSO in a welding manner.

For example, FIG. 2 is a bottom view showing the bottom of the ship hull 10, showing a state in which hundreds of anticorrosive devices P are arranged on the bottom of the hull 10. FIG.

3 is a front view of the marine anticorrosive device shown in FIG.

Referring to FIG. 3, the vessel anticorrosive device P may include an anticorrosive block 100 and a folding support 200 coupled to the anticorrosive block 100. The foldable support 200 may be provided in a pair.

The anticorrosive block 100 is made of a metal (eg, zinc) of a material having a relatively high electric negative degree compared to the hull, and may serve as a sacrificial anode.

Here, the electronegativity is a relative force for pulling a pair of valence electrons in a molecule, and the greater the electronegativity, the greater the force for pulling an electron.

The anti-corrosion block 100 may play a role of preventing or delaying corrosion of the hull in water by using the electric negative degree.

In this way block 100 may have a size and shape corresponding to the technical specifications for large structures or ships, such as FPSO. For example, the anticorrosive block 100 may be formed in a rectangular block shape or a trapezoidal block shape having a length longer than a cross section (width cross section) such as a quadrangle or a trapezoidal shape.

Anticorrosive block 100 may be coupled to the connection support 210 of the folding support 200 by the casting operation.

The foldable support 200 has a folding structure that is folded so that the anticorrosive block 100 is proximate or spaced apart from the bottom surface of the hull 10 and may be disposed on both sides of the anticorrosive block.

For the folding structure, the folding support 200 is a kind of folding hanger structure that hangs the anti-corrosion block 100 as welded to the bottom surface of the hull, which is folded at the time of ship launching and then straightened or straightened after launching. It has a hinge portion 201.

The foldable support 200 has lower supports 220 extending at right angles from both sides of the connecting support 210 protruding from the anticorrosive block 100, respectively, and ends and hinge portions 201 of the lower supports 220. It may include an upper support 230 is folded or foldable through the).

Here, the upper end of the upper support 230 may be fixed by welding to the hull 10.

In addition, the lower support 220 and the upper support 230 may be made of a straight bar or plate.

In addition, the material of the connection support 210, the lower support 220, the upper support 230 may be formed of a material such as stainless steel resistant to corrosion.

In addition, the hinge portion 201 may be formed of a bolt and nut combination fastened to the through-holes of the overlapping portions of the lower support 220 and the upper support 230.

In addition, the material of the bolt and nut combination of the hinge portion 201 may be formed of a material such as stainless steel resistant to corrosion.

FIG. 4 is a side view for explaining an operation relationship of the marine anticorrosive apparatus shown in FIG. 3.

Referring to FIG. 4, when the ship anticorrosive device is installed in the ship 10 before launching the ship, the lower support 220 of the foldable support 200 is perpendicular to the upper support 230 based on the hinge portion 201. It can be kept at an acute angle.

That is, the worker may tighten the bolts and nuts of the hinge portion 201 to maintain the lower support 220 and the upper support 230 at a right angle with respect to the hinge portion 201 (left view in FIG. 4). .

In addition, the worker is acute angle relative to the hinge portion 201, the lower support 220 and the upper support 230 to prevent the sag caused by the weight of the anti-corrosion block 100 and the lower support 220 in advance. The bolt and nut of the hinge portion 201 may be fastened to maintain the state.

Of course, after launching the ship, the operator loosens the bolts and nuts of the hinge portion 201, rotates the lower support 220 and the anticorrosive block 100, and then tightens the bolts and nuts again, the lower support 220 and The upper support 230 can maintain a straight shape to form a straight shape (the right figure of Figure 4).

Hereinafter, a launching process of a ship provided with a ship anticorrosive device according to the first embodiment will be described.

5 and 6 are schematic diagrams for explaining the launching process of a vessel having a marine vessel apparatus shown in FIG.

Referring to FIG. 5, the marine anticorrosive device P according to the first embodiment is installed on the bottom surface BL of the hull 10 in a folded state by the folding support 200, and at this time, the anticorrosive block 100 is provided. The silver can maintain a state of being in close contact with the bottom surface BL of the hull 10.

In addition, the plurality of keel lumber 90 in the dock (D) may support the bottom surface BL of the hull 10 avoiding the installation position of the marine anticorrosive device (P).

Then, when water is made in the dock (D), the hull 10 is raised on the basis of the bottom surface of the dock, the clearance gap between the bottom surface BL of the hull 10 and the upper surface of the keel half wood 90 (C) can be made.

At this time, the height H of the dock D is 11 meters, the reference depth R for launching is 7 meters, and the distance M from the reference depth R to the bottom surface BL of the hull 10. ) Is 4.7 meters, and the clearance K is 1.8 meters when the height K of the keel lumber 90 disposed in the dock D to support the bottom surface BL of the hull 10 is 1.8 meters. Mm can be.

At this time, as indicated by the dotted line, since the ship anticorrosive device (P) is manufactured in response to a superstructure or a technical specification for ships, such as FPSO, when deployed in a straight line by the folding support 200, the ship anticorrosive device in the unfolded state (P) the first vertical gap Q1 between the anticorrosive block 100 of the hull 10 and the bottom surface BL of the hull 10 is provided between the bottom surface BL of the hull 10 and the top surface of the keel lumber 90. By being adjusted relatively longer than the clearance gap (C), even if the hull 10 is injured by the launching, it can be caught in the keel antagon (90).

However, since the marine anticorrosive device P according to the first embodiment is installed on the bottom surface BL of the hull 10 in a state of being folded by the folding support 200, the marine anticorrosive device P of the folded state is The second vertical gap Q2 between the bottom surface and the bottom surface BL of the anti-corrosion block 100 is adjusted to be relatively smaller with respect to the bottom surface BL than the clearance gap C, and as a result, the keel antagonism ( 90 can be launched normally without causing interference.

Referring to FIG. 6, with respect to the hull 10 launched out of the dock D, an operator (eg, a diver) releases the bolt and nut of the hinge portion 201 through an underwater operation, such as the lower support 220 and By rotating the anti-corrosion block 100, the lower support 220 and the upper support 230 to form a straight shape.

In this case, an appropriate gap may be formed between the upper surface of the anticorrosive block 100 and the bottom of the hull 10 to maximize the anticorrosive effect.

Second Embodiment

The marine anticorrosive apparatus of the present invention described in this embodiment is the same as the first embodiment except that the washer portion has a water dissociable surface layer formed on the outside of the core and a locking portion. Therefore, the same or similar reference numerals will be given to the same or corresponding components in FIGS. 2 to 10, and the description thereof will be omitted here.

7 is a front view of a marine anticorrosion apparatus according to a second embodiment of the present invention.

Referring to FIG. 7, the ship anticorrosive device P may include an anticorrosive block 100 and a folding support 200a, and the washer unit 300 may be further included in the hinge portion 201 of the folding support 200a. In addition, the locking unit 400 may be further included in the foldable support 200a around the hinge unit 201.

FIG. 8 is a side view for explaining an operation relationship of the marine anticorrosive apparatus shown in FIG. 7.

7 and 8 in parallel, the foldable support (200a) is a lower support (220a) and each lower support extending at right angles from both sides of the connection support 210, respectively protruding from the anticorrosive block 100, It may include an upper support 230a foldable or foldable through the end and the hinge portion 201 of the (220a).

The folding support 200a is configured to fold the lower support 220a and the upper support 230a based on the hinge portion 201 as described in the first embodiment.

At this time, the upper support 230a may be made of a relatively narrow upper plate 231 and a lower plate 232 to which the locking unit 400 can be mounted because of its relatively wide width.

A pin hole 233 for inserting the fixing pin 410 (see FIG. 9 or FIG. 10) of the locking portion 400 may be formed on the inner surface of the lower plate 232 of the upper support 230a.

The end of the fixing pin 410 inserted into the pin hole 233 may be formed in a hemispherical shape so as to reduce the frictional resistance and to be easily inserted.

In addition, the locking portion 400 may be mounted on the inner portion of the upper end of the lower support 220a.

When the pinhole 233 and the locking part 400 draw a virtual arc based on the hinge part 201, the inner surface of the lower plate 232 of the upper support 230a to form a rotation angle of 90 degrees on the arc line or It may be disposed on the upper end of the lower support (220a).

FIG. 9 is a cross-sectional view of the line A-A shown in FIG. 8, and FIG. 10 is a cross-sectional view of the line B-B shown in FIG. 8.

Referring to FIG. 9, the washer part 201 is fastened and a washer part is disposed between the lower support part 220a and the upper support part 230a based on a portion where the lower support part 220a and the upper support part 230a overlap. 300 may be interposed.

The washer part 300 may include a core 310 having a ring shape as a corrosion resistant stainless steel material, and a hydrolysis surface layer 320 stacked or superimposed on the outside of the core 310.

Here, the water dissociable surface layer 320 may be formed of a material that can be removed from the core 310 by melting as shown in FIG. 10 when placed in an environment such as underwater.

For example, the material of the water dissociable surface layer 320 may include a composition such as an ethyl acrylate monomer, an ethyl methacrylate monomer, a polypropylene glycol, a 2-hydroxyethyl butyl acrylate monomer, and 2-ethylnuclear acrylate. Can be dissociated. In addition, since the material of the water dissociable surface layer 320 may be composed of a composition for a water-soluble adhesive which is commonly used, the weight of each composition may not be limited.

When the water dissociable surface layer 320 is melted and removed from the core 310 (see FIGS. 9 and 10), as the gaps N1 and N2 are formed by the thickness of the water dissociable surface layer 320, the operator may hinge the hinge portion ( Even if the bolt and nut of 201) are not loosened, the fastening state of the bolt and the nut may be loosened.

The locking part 400 moves along the spring seating hole 401 by using the spring 420 inserted into the spring seating hole 401 of the inner side of the upper end of the lower support 220a and the elastic force of the spring 420. Accordingly, it may include a fixing pin 410 that is fastened between the spring mounting hole 401 and the pin hole 233 of the upper support 230a.

Hereinafter, an operation relationship using the washer part 300 and the locking part 400 will be described.

As shown in FIG. 9, the locking part 400 has a surface of the upper support 230a except for the pinhole 233 of the upper support 230a when the upper support 230a and the lower support 220a are folded at an angle of 90 degrees. You may be in simple contact with.

In this state, the ship is made of water, and the locking part 400 and the washer part 300 may be submerged in water.

Accordingly, when the water dissociable surface layer 320 of the washer part 300 is melted and removed from the core 310 (see FIGS. 9 and 10), the gaps N1 and N2 are formed by the thickness of the water dissociable surface layer 320. Can be.

In this case, as shown in FIG. 10, since the anticorrosive block 100 is in an eccentric position from the hinge portion 201 by the lower support 220a, by the weight of the anticorrosive block 100, the lower support 220a and the anticorrosive block 100 may be rotated from the state of FIG. 9 to the state of FIG. 10 with respect to the hinge portion 201.

For example, the weight of each anticorrosive block 100 may be, for example, about 30 kg, which is manufactured for loading a hull such as FPSO.

As a result, the upper support (230a) and the lower support (220a) can be unfolded in a straight shape, such as 180 degrees.

In this case, the locking portion 400 and the pinhole 233 can be placed on the same straight line.

Accordingly, the fixing pin 410 of the locking unit 400 is inserted into the pin hole 233 by the elastic force of the spring 420, thereby serving to secure the upper support 230a and the lower support 220a to each other. can do.

As a result, the ship's anticorrosion apparatus according to the second embodiment can use the washer portion 300 having the water dissociable surface layer 320 to semi-automatically rotate and drop the anticorrosive block 100 in water to achieve optimal anticorrosive efficiency. By placing the anticorrosive block in the position, it is possible to reduce the manual work of unfolding the folding support by the diver's underwater work after launching the ship.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element according to the application field, or can combine or substitute the embodiments in a form not explicitly disclosed in the embodiment of the present invention, It is to be understood that the invention is not limited to the disclosed embodiments. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

100: anticorrosive block 200, 200a: folding support
300: washer part 400: locking part

Claims (6)

The hull,
Anti-corrosion block made of a metal of a relatively large electronegativity compared to the hull,
And a folding support disposed on both sides of the anticorrosive block to adjust the vertical gap between the anticorrosive block and the bottom of the hull.
Marine anticorrosive devices.
The method of claim 1,
The folding support,
A connection support coupled to the anticorrosive block;
Lower supporters extending at right angles from both sides of the connection support;
It is folded or foldably coupled through the end and the hinge of the lower support, including an upper support fixed to the bottom surface of the hull
Marine anticorrosive devices.
3. The method of claim 2,
The hinge unit includes:
It includes a bolt and nut combination fastened to the through hole of the overlapping portion of the lower support and the upper support
Marine anticorrosive devices.
3. The method of claim 2,
The hinge portion is fastened further includes a washer portion interposed in a portion where the lower support and the upper support overlap,
The washer portion is made of a stainless steel material resistant to corrosion and has a ring shape core,
It includes a water dissociable surface layer laminated to the outside of the core
Marine anticorrosive devices.
5. The method according to any one of claims 2 to 4,
A spring inserted into a spring seating hole of an inner portion of an upper end of the lower support;
Further comprising a locking portion including a fixing pin coupled between the spring seating hole and the pin hole of the upper support as it moves along the spring seating hole by using the elastic force of the spring.
Marine anticorrosive devices.
The method of claim 5, wherein
The end of the fixing pin inserted into the pin hole is formed in a hemispherical shape
Marine anticorrosive devices.

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