KR100951373B1 - Protective cover assembly for offshore structure and installing method for the same - Google Patents

Abstract

PURPOSE: A marine construction protective cover assembly and an installation method thereof are provided to prevent marine construction from being corroded due to seawater for long time by blocking the contact of the seawater and the marine construction. CONSTITUTION: A marine construction(20) protective cover assembly comprises a protective cover body(310), a first cover flange(320), a second cover flange(330), and a combining unit(400). The protective cover body protects the marine construction exposing to the seawater. The first cover flange installed at one side of the protective cover body has a first flange base portion and a first flange extension portion. The second cover flange installed at the other side of the protective cover body has the second flange base portion and the second flange extension portion. The combining unit couples the first flange extension portion and the second flange extension portion.

Description

Protective cover assembly for offshore structure and installing method for the same}

The present invention relates to an offshore structure protective cover assembly and a method of installing the same, and more particularly, to effectively prevent corrosion of the offshore structure by seawater, and to offshore structure protective cover assembly that can be stably installed and maintained on the offshore structure. And it relates to a method of installation thereof.

Steel pipes are frequently used in bridge structures, subsea structures, fluid transfer pipes, gas delivery pipes, and submarine cables. An essential consideration in the use of the steel pipe is that corrosion should be prevented in contact with water. When the steel pipe is corroded by moisture, seawater, etc., it causes a safety accident and marine pollution due to a decrease in load resistance.

Corrosion occurs in the steel pipe is a portion that is repeatedly exposed to air, water and water pressure splash and tidal flat. Here, in general, the splash zone means a range of water splashing when the wave hits the beach or lake shore, and the tidal flat is a range exposed to the air at high tide and low tide.

Recently, protective devices are installed on the outer surface of the steel pipe to prevent corrosion of the steel pipe, but these protective devices are difficult to install and it is difficult to maintain the watertight state of the steel pipe for a long time, so that the corrosion protection function of the steel pipe can be properly performed. There is a problem that becomes impossible.

The present invention is to solve the above-mentioned problems, the problem to be solved of the present invention is to protect the marine structure protection cover assembly that can prevent the corrosion of the marine structure by sea water for a long time by blocking the contact of the marine structure and sea water. And to provide a method of installation thereof.

Another problem to be solved by the present invention is to provide an environmentally friendly marine structure protective cover and a method of installing the same as a flexible material that can be easily processed and installed, can lower production costs.

In order to achieve the above object to be solved, the present invention is a protective cover body for wrapping a marine structure exposed to sea water, is installed on one side of the protective cover body, the first flange base portion coupled to the protective cover body and A first cover flange having a first flange extension portion extending from the first flange base portion at a predetermined angle, the second flange base portion and the second flange base portion installed on the other side of the protective cover body and coupled to the protective cover body; It provides a marine cover cover assembly including a second cover flange having a second flange extension extending from the flange base portion at an angle, and a coupling unit coupling the first flange extension and the second flange extension. do.

Here, a first protrusion protrudes from the engaging surface of the first flange extension portion, and a second protrusion protrudes from the engaging surface of the second flange extension portion, and the first protrusion and the second protrusion are deformed by an external force. A watertightness can be maintained between the engaging surface of the first flange extension and the engaging surface of the second flange extension.

In addition, the protective cover body, the first cover flange and the second cover flange may all be made of a high density polyethylene material.

In addition, a first internal angle formed by the first flange base part and the first flange extension part, and a second internal angle formed by the second flange base part and the second flange extension part may form an obtuse angle.

In addition, the first flange base portion and the second flange base portion may be coupled to the protective cover body by any one of ultrasonic welding, high frequency welding, heat welding, hot melt adhesive bonding.

Here, the marine structure may be wrapped in a shape substantially the same as the external shape of the marine structure in a state in which the first flange base part and the second flange base part are coupled to the protective cover body.

In addition, a first stepped groove is formed in the outer surface of the first flange extension, a first through hole is formed in the first stepped groove, a second stepped groove is formed in the outer surface of the second flange extension, A second through hole may be formed in the second stepped groove.

In addition, the coupling unit may include a first auxiliary coupling member installed in the first through hole, a second auxiliary coupling member installed in the second through hole, and the first auxiliary coupling member and the second auxiliary coupling member. It may include a bolt installed while penetrating the inside, and a nut coupled to the bolt.

In addition, a coupling protrusion may be formed on one of the lower side of the first flange base portion coupled to each other and an outer surface of the protective cover body, and a coupling groove may be formed on the other.

In addition, one end of the protective cover body may be inserted into the insertion groove formed on one side of the first flange base portion to be coupled.

In addition, the protective cover assembly may further include a bundle device for preventing the protective cover body from flowing down. The bundle device includes a guide member protruding on an outer surface of the protective cover body, a first guide hole formed in the first flange extension part, a second guide hole formed in the second flange extension part, and It may include a fastening band which is fastened while passing through the guide member, the first guide hole and the second guide hole.

In addition, the protective cover assembly may further include a stopper unit for preventing the protective cover body from flowing down. The stopper unit may include a stopper surrounding the marine structure, a support member provided at one side of the stopper to surround the outer circumference of the lower end of the protective cover body, and a fastening member for fastening both sides of the stopper.

According to another embodiment of the present invention, the present invention comprises the steps of coupling the first cover flange having the first flange extension and the first flange base portion to the protective cover body, the second flange extension and the second cover to the protective cover body Engaging a second cover flange having a flange base portion, wrapping the protective cover body coupled to the first cover flange and the second cover flange on the outside of an offshore structure exposed to seawater, and extending the first flange The first protrusion provided in the portion and the second protrusion provided in the second flange extension portion are deformed by external force, thereby maintaining a watertight between the mating surface of the first flange extension and the mating surface of the second flange extension. Providing a method of installing a marine structure protective cover assembly comprising the step of engaging the first flange extension and the second flange extension to .

The method of installing the marine structure protective cover assembly may further include installing a stopper unit on the lower portion of the protective cover body to prevent the protective cover body from flowing down.

In addition, the installation method of the marine structure protective cover assembly is fastening to wrap the outer surface of the protective cover body and penetrates through the first flange extension and the second flange extension to prevent the protective cover body from flowing down The method may further include installing a band.

Effects of the marine structure protective cover assembly and its installation method according to the present invention are as follows.

First, the first cover flange and the second cover flange protruding from the first cover flange and the second cover flange installed on both sides of the protective cover body surrounding the marine structure are deformed by external force, and thus the first cover flange and the second cover flange are in a watertight state. Combination has the advantage of preventing corrosion of offshore structures.

Second, the protection by installing a bundle device for wrapping the outer surface of the protective cover body to prevent the protective cover body that surrounds the offshore structure, and the stopper unit for supporting the protective cover body from the lower side of the protective cover body There is an advantage that the cover body can be attached to the marine structure stably for a long time.

Third, the protective cover body, the first cover flange, and the second cover flange are all made of high-density polyethylene (HDPE) material, thereby securing flexibility, making it closely adhered to the marine structure, improving watertightness, and reducing production costs. It is environmentally friendly, easy to process and easy to install on site.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a marine structure protective cover assembly is installed in accordance with the present invention, Figure 2 is a partial cutaway perspective view of a portion of the protective cover assembly of Figure 1, Figure 3 is a protective cover according to the invention marine It is a perspective view which shows the state before installing in a structure.

1 to 3, the concrete structure 10 exposed on the water surface is formed to extend to the marine structure 20, for example, steel pipe pipe, etc. in contact with the sea water, a part of the marine structure 20, That is, the protective cover assembly 1000 is installed at a portion where corrosion may occur due to seawater.

The resin layer is caulked at the junction of the upper end of the protective cover assembly 1000 and the lower end of the concrete structure 10.

The protective cover assembly 1000 is a corrosion preventing member 100, the corrosion preventing member 100 is wound on the outer surface of the marine structure 20 to prevent corrosion of the marine structure 20 exposed to sea water It includes a covering member 200 surrounding the outer surface of the protective cover 300 is installed while wrapping the outer side of the covering member 200.

As the anti-corrosion member 100, a petrolatum tape directly enclosing the marine structure 20 may be used. The petrolatum tape is impregnated with a nonwoven fabric by adding a corrosion inhibitor, a water release agent, etc. to the petrolatum compound. Here, the petrolatum is a soft amorphous non-crystalline or microcrystalline wax obtained by solvent dewaxing the lubricating oil fraction of petroleum, and the heavy weight of the lubricating oil. (重 質) A mixture of semi-solid state kneaded with oil.

The corrosion preventing member 100 has a thickness of about 2.5 mm and a width of about 300 mm, and is wound while being overlapped by about 50% in wrapping the marine structure 20.

As the coating member 200, a PVC sheet installed on the outside of the corrosion preventing member 100 may be used. The coating member 200 has a thickness of about 0.4 mm and a width of about 200 mm. The covering member 200 is wound while overlapping about 35% in wrapping the corrosion preventing member 100.

The protective cover 300 is a protective cover body 310, the first cover flange 320 is coupled to one side of the protective cover body 310 and the second cover coupled to the other side of the protective cover body 310 Flange 330.

The protective cover body 310, the first cover flange 320 and the second cover flange 330 are all made of a high density polyethylene material. High-density polyethylene is molded by mixing additives such as antioxidants and stabilizers with polyethylene produced by low pressure polymerization. It is excellent in chemical resistance, chemical resistance, and durability, and is suitable for various landfills and waste disposal facilities. In addition, the high-density polyethylene is excellent in adhesion, easy to remove the suspended matter attached to the outer surface, light weight is easy to handle the operator. In addition, the price is low, mass production is possible, and the processability is excellent and environmentally friendly properties.

The first cover flange 320 is installed at one side of the protective cover body 310, and the first flange base portion 323 and the first flange base portion 323 coupled with the protective cover body 310. A first flange extension 321 is formed to extend at an angle in the.

Similarly, the second cover flange 330 is installed on the other side of the protective cover body 310, the second flange base portion 333 and the second flange base portion ( And a second flange extension 331 extending at a predetermined angle at 333.

Here, when the first flange extension part 321 and the second flange extension part 331 are combined, the first cover flange ( 320 and one or more of the second cover flanges 330 are installed at a portion spaced apart from both ends of the protective cover body.

As a result, in the region where the first flange extension portion 321 and the second flange extension portion 331 are connected, the protective cover main body 310 overlaps to effectively block the contact between the marine structure and the seawater. .

Of course, the first cover flange 320 and the second cover flange 330 may be installed at both ends of the protective cover body 310.

In addition, a first internal angle α1 formed by the first flange base part 323 and the first flange extension part 321, and the second flange base part 333 and the second flange extension part 331. All of the second internal angle α2 forms an obtuse angle.

When both the first and second interior angles α1 and α2 form an obtuse angle, for example, 110 °, the protective cover body 310 covers the circumferential surface of the marine structure 20. The joining surface of the first flange extension part 321 and the joining surface of the second flange extension part 331 are completely in close contact with each other.

That is, when the protective cover 300 covers the marine structure, the area where the protective cover body 310 and the first cover flange 320 and the second cover flange 330 are in contact with each other becomes thick and the protective cover body ( It becomes stronger than the stiffness of 310, so it is less deformed. Therefore, in order to compensate for such deformation, the oblique angle between the first inner angle α1 and the second inner angle α2 is formed so that the protective cover is closely contacted without forming a gap between the marine structures.

In addition, the first flange base part 323 and the second flange base part 333 may be coupled to the protective cover body 310 by any one of ultrasonic welding, high frequency welding, heat welding, hot melt adhesive bonding. . Here, the offshore structure 20 is formed in the same shape as that of the offshore structure in a state where the first flange base portion 323 and the second flange base portion 333 are coupled to the protective cover body 310. You can wrap it.

In addition, the protective cover assembly further includes a coupling unit 400 for coupling the first flange extension 321 and the second flange extension 331.

The coupling unit 400 may include a first auxiliary coupling member 430 installed in the first through hole 321b formed in the first flange extension part 321, and a second auxiliary coupling member 430 formed in the second flange extension part 331. 2, the second auxiliary coupling member 440 installed in the through hole 331b, the bolt 410 installed while penetrating the inside of the first auxiliary coupling member 430 and the second auxiliary coupling member 440, and A nut 420 is coupled to the bolt 410.

As a result, the protective cover 300 in the state in which the first cover flange 320 and the second cover flange 330 are coupled to both sides of the protective cover main body 310 is installed at the outermost part surrounding the marine structure. When the first flange extension 321 and the second flange extension 331 is coupled to the coupling unit 400.

Hereinafter, a structure in which the first flange extension part and the second flange extension part according to the present invention will be described with reference to FIGS. 4A to 4C.

Figure 4a is a view showing a state in which the protective cover is bent to surround the marine structure, Figure 4b is the first auxiliary coupling member and the second auxiliary coupling member according to the present invention, respectively, the first flange extension and the first 2 is a view showing a state installed in the flange extension, Figure 4c is a view showing a state in which the first flange extension and the second flange extension is coupled by the coupling unit.

4A to 4C, when the corrosion preventing member 100, the covering member 200, and the protective cover 300 are sequentially disposed on the outer surface of the marine structure 20, the first flange extension part ( 321 and the second flange extension 331 is coupled by a coupling unit.

A first stepped groove 321a is formed in an outer surface of the first flange extension part 321, a first through hole 321b is formed in the first stepped groove 321a, and the second flange extension part is formed. A second stepped groove 331a is formed in the outer surface of the 331, and a second through hole 331b is formed in the second stepped groove 331a.

Before the bolt 410 and the nut 420 of the coupling unit are coupled, a first auxiliary coupling member 430 is installed in the first through hole 321b, and a second is installed in the second through hole 331b. An auxiliary coupling member 440 is installed (see FIG. 4B). The first auxiliary coupling member 430 and the second auxiliary coupling member 440 may be formed of a metallic material, for example, to prevent wear when the bolt 410 is tightened and to prevent the bolt 410 from screwing. Made of stainless steel or bronze.

Specifically, the head portion 431 of the first auxiliary coupling member is located in the first stepped groove 321a, and the body portion 432 of the first auxiliary coupling member has the first through hole 321b. After being penetrated, the end portion 432a of the trunk portion is torn and fixed while being torn out of the circumferential surface of the first through hole 321b by a punching operation. The second auxiliary coupling member 440 is installed on the second flange extension part in the same manner as the first auxiliary coupling member 430 is installed on the first flange extension part 321.

After the first auxiliary coupling member 430 and the second auxiliary coupling member 440 are installed on the first flange extension 321 and the second flange extension 331, respectively, the bolt 410 and The nuts are installed and coupled to the first stepped grooves 321a and the second stepped grooves 331a, respectively.

5, 6a, 6b, the structure of the protective cover provided in the protective cover assembly according to the present invention will be described in more detail.

As described above, the protective cover 300 includes a protective cover body 310, a first cover flange 320, and a second cover flange 330. In addition, the first cover flange 320 includes a first flange base portion 323 and a first flange extension portion 321, and the second cover flange 330 includes a second flange base portion 333 and And a second flange extension 331.

Here, a first protrusion 325 protrudes from the engaging surface 321c of the first flange extension, and a second protrusion 335 protrudes from the engaging surface 331c of the second flange extension. The protrusion 325 and the second protrusion 335 are deformed by an external force to maintain the watertight between the engaging surface 321c of the first flange extension and the engaging surface 331c of the second flange extension. It becomes possible.

Preferably, the first protrusion 325 and the second protrusion 335 are coupled to each other while being engaged with each other, but the first protrusion 325 and the second protrusion 335 may be coupled to correspond to each other. When the first projection and the second projection correspond to each other, the first projection and the second projection are crushed by an external force to maintain the watertight between the engagement surface of the first flange extension and the engagement surface of the second extension. Let's go.

In addition, one side of the upper end surface 321d of the first flange extension part 321 is manufactured in the form of a chamfer in order to reduce the resistance due to algae and to prevent the vortex of the sea water. Of course, the same also applies to the upper end face of the extension portion of the second flange.

In addition, a coupling protrusion 327 is formed on the lower surface 323a of the first flange base part to secure the coupling with the protective cover body 310. A coupling groove 311 corresponding to the coupling protrusion 327 is formed on an outer surface of the protective cover body. Of course, the coupling protrusion may be formed in the protective cover body, and the coupling groove may be installed on the lower surface of the first flange base portion 323. In addition, as described above, the first flange base part 323 and the protective cover body 310 may be coupled in any one of ultrasonic welding, high frequency welding, resistance welding, and hot melt adhesive bonding.

7, the structure of another embodiment of the protective cover according to the present invention will be described.

The first cover flange 3200 provided in the protective cover has a first flange base part 3230 and a first flange extension part 3210 as in the above-described embodiment. However, unlike the above-described embodiment, the first flange base portion 3230 has an insertion groove 3321 formed on one side of the first flange base portion 3230.

In addition, a base protrusion 3333 protruding in the direction of the insertion groove 3321 is formed on a surface of the insertion groove 3231.

Meanwhile, at one end of the protective cover body 310 inserted into the insertion groove 3321, a mounting groove 3110 corresponding to the base protrusion 3333 is formed.

As a result, one end of the protective cover body is inserted into and coupled to the insertion groove 3231 while the base protrusion 3333 and the mounting groove 3110 correspond to each other. After one end of the protective cover main body 310 is inserted into the insertion groove 3321, the first flange base portion 323 and the protective cover main body 310 are ultrasonic fusion, high frequency fusion, thermal fusion, It can be bonded in any one of hot melt adhesive bonds.

Although not shown in the drawings, the second cover plan which is coupled to the other side of the protective cover body may also be coupled in the same manner as the first cover flange described above.

Referring to Figure 8, it will be described with respect to the stopper unit provided in the protective cover assembly according to the present invention.

The stopper unit 500 is installed under the protective cover body 310 to prevent the protective cover body 310 from flowing down.

The stopper unit 500 includes a stopper 510 made of an annular rod surrounding the marine structure 20, and a support member 520 provided on an upper side of the stopper 510 to surround an outer circumference of the lower end of the protective cover body. ) And a fastening member 530 for fastening both sides of the stopper 510.

The fastening member 530 includes a pair of flanges formed on both sides of the stopper and bolts and nuts for coupling the pair of flanges.

The stopper 510 is firmly and stably fixed to the marine structure 20 by the coupling force of the fastening member 530, and the support member 520 is the protective cover by the coupling force of the fastening member 530. By pressing the main body 310 from the outer direction to the inner direction it is possible to prevent the protective cover main body 310 flows down.

In addition, the stopper 510 may be firmly attached to the marine structure 20 by spot welding at two or more locations with the marine structure 20. In addition, the stopper 510 and the support member 520 may be made of a material having corrosion resistance to corrosion of seawater, for example, stainless steel.

Referring to Figure 9, the protective cover assembly according to the present invention further includes a bundle device for preventing the protective cover body from flowing down.

The bundle device includes a guide member 610 protruding on an outer surface of the protective cover body 310, a first guide hole 621 formed in the first flange extension part 321, and the second flange. Fastening band fastened while passing through the second guide hole 623 formed in the extension part 331, the guide member 610, the first guide hole 621, and the second guide hole 623. City).

As a result, after the fastening band passes through the guide member 610, the first guide hole 621, and the second guide hole 623, the protective cover body 310 is strongly reinforced by a band fastener (not shown). When tightened, even when an external force is applied to the protective cover body, the protective cover body 310 is firmly fixed to the marine structure so that it does not flow down.

The guide member 610 may have an annular shape to allow the fastening band to pass therethrough, and may be integrally formed to protrude from an outer surface of the protective cover body 310 when the protective cover body 310 is manufactured. . Of course, the guide member may be manufactured separately from the protective cover body and coupled to the outer surface of the protective cover body.

1 to 9, the installation method of the marine structure protective cover assembly according to the present invention will be described.

When the marine structure is installed, the corrosion preventing member 100 is wrapped on the outer surface of the marine structure, the coating member 200 is installed on the outer surface of the corrosion preventing member. In addition, a protective cover 300 is installed on the outer surface of the covering member.

At this time, the protective cover 300 is manufactured and installed through the following process.

First, the user couples the first cover flange 320 having the first flange extension part 321 and the first flange base part 323 to the protective cover body 310. In addition, the user couples the second cover flange 330 having the second flange extension part 331 and the second flange base part 333 to the protective cover body 310.

The step of coupling the first cover flange 320 to the protective cover body 310 and the step of coupling the second cover flange 330 to the protective cover body 310 may be reversed.

Next, the user wraps the protective cover, that is, the first cover flange 320, the second cover flange 330, and the combined body of the protective cover body outside the marine structure exposed to the seawater.

Next, the user uses the coupling unit 400 to couple the first flange extension 321 and the second flange extension 331. At this time, the first flange 325 provided in the first flange extension part 321 and the second protrusion 335 provided in the second flange extension part 331 are deformed by an external force to extend the first flange. The watertight between the mating surface of the portion 321 and the mating surface of the second flange extension 331 is maintained.

When the first flange extension part 321 and the second flange extension part 331 are coupled by the coupling unit, the first auxiliary coupling member 430 and the second auxiliary coupling member 440 may be formed of the first coupling member 430. The first cover flange 320 and the second cover flange may be installed in the first flange extension 321 and the second flange extension 331 before being coupled to the protective cover body.

Next, the stopper unit 500 is installed under the protective cover body 310 to prevent the protective cover body 310 from flowing down.

In addition, not only to prevent the protective cover body 310 flows down to the lower portion, even if an external force is applied to the protective cover body 310 to ensure that the protective cover body 310 is firmly and stably fixed to the marine structure In order to cover the outer surface of the protective cover body and a fastening band penetrating the first flange extension 321 and the second flange extension 331 is installed.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and various modifications may be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. It is possible and such variations are within the scope of the present invention.

1 is a view showing a state installed marine structure protective cover assembly according to the present invention.

FIG. 2 is a partial cutaway perspective view of a portion of the protective cover assembly of FIG. 1;

Figure 3 is a perspective view showing a state before the protective cover is installed in the marine structure according to the present invention.

Figure 4a is a view showing a state in which the protective cover is bent to surround the marine structure according to the present invention.

Figure 4b is a view showing a state in which the first auxiliary coupling member and the second auxiliary coupling member according to the present invention is installed on the first flange extension and the second flange extension, respectively.

Figure 4c is a view showing a state in which the first flange extension and the second flange extension is coupled by the coupling unit in accordance with the present invention.

5 is a view showing a state in which the first cover flange and the protective cover body according to the present invention is coupled.

Figure 6a is a view showing a state before the engaging surface of the first flange extension and the engaging surface of the second flange extension in accordance with the present invention.

Figure 6b is a view showing a state after the engaging surface of the first flange extension and the engaging surface of the second flange extension in accordance with the present invention.

7 is a view showing another embodiment in which the first cover flange and the protective cover body are coupled according to the present invention.

8 is a view showing a state in which a stopper unit is installed according to the present invention.

9 is a view showing a part of the configuration of the bundle device according to the present invention.

<Description of reference numerals for the main parts of the drawings>

100: corrosion preventing member 200: coating member

300: protective cover 310: protective cover body

320: first cover flange 321: first flange extension

323: first flange base portion 325: first projection

327: engaging projection 330: second cover flange

331: second flange extension portion 323: second flange base portion

335: second projection 410: bolt

420: nut 430: first auxiliary coupling member

440: second auxiliary coupling member 500: stopper unit

510: stopper 520: support member

530: fastening member 610: guide member

621: first guide hole 623: second guide hole

Claims (13)

Protective cover body for wrapping the marine structure exposed to sea water; A first cover flange installed at one side of the protective cover body and having a first flange base part coupled to the protective cover body and a first flange extension part extending at a predetermined angle from the first flange base part; A second cover flange installed at the other side of the protective cover body and having a second flange base portion coupled to the protective cover body and a second flange extension portion extending at a predetermined angle from the second flange base portion; And, It includes a coupling unit for coupling the first flange extension and the second flange extension, A first protrusion protrudes from the mating surface of the first flange extension, and a second protrusion protrudes from the mating surface of the second flange extension, and the first protrusion and the second protrusion are deformed by an external force while the first protrusion is protruded. Maintaining the watertight between the mating surface of the flange extension and the mating surface of the second flange extension, The first and second cover flanges having projections on the mating surface of the extension portion is a protective cover assembly of the offshore structure consisting of high density polyethylene (HDPE). The method of claim 1, The protective cover body, the first cover flange and the second cover flange are all made of a high density polyethylene material, the protective cover assembly of the offshore structure. The method of claim 1, The first inner shell formed by the first flange base portion and the first flange extension portion, and the second inner shell formed by the second flange base portion and the second flange extension portion all form an obtuse angle, characterized in that the oblique angle assembly The method of claim 1, The first flange base portion and the second flange base portion are coupled to the protective cover body by any one of ultrasonic welding, high frequency welding, heat welding, and hot melt adhesive bonding, and the first flange base portion and the second flange base portion Marine structure protection cover assembly, characterized in that the marine structure is wrapped in the substantially same shape as the outer shape of the marine structure in the state coupled to the protective cover body. The method of claim 1, A first stepped groove is formed in an outer side surface of the first flange extension, a first through hole is formed in the first stepped groove, a second stepped groove is formed in an outer side surface of the second flange extension, and the second step is formed. Marine structure protection cover assembly, characterized in that the stepped groove is formed with a second through hole. The method of claim 5, The coupling unit may include a first auxiliary coupling member installed in the first through hole, a second auxiliary coupling member installed in the second through hole, and an inside of the first auxiliary coupling member and the second auxiliary coupling member. A marine structure protective cover assembly comprising a bolt installed while penetrating, and a nut coupled to the bolt. The method of claim 1, Offshore structure protective cover assembly, characterized in that the engaging projection is formed on one of the lower side of the first flange base portion and the outer surface of the protective cover body is coupled to each other is formed. The method of claim 1, One end of the protective cover body is inserted into the insertion groove formed on one side of the first flange base portion, marine structure protective cover assembly, characterized in that coupled. The method according to any one of claims 1 to 8, Further comprising a bundle device for preventing the protective cover body from flowing down, the bundle device is a guide member protruding on the outer surface of the protective cover body, the first flange formed on the first flange extension A marine structure protective cover assembly comprising a guide hole, a second guide hole formed in the second flange extension portion, and a fastening band coupled through the guide member, the first guide hole and the second guide hole. The method according to any one of claims 1 to 8, And a stopper unit for preventing the protective cover body from flowing downward, wherein the stopper unit is provided on one side of the stopper and the stopper surrounding the marine structure, and is provided around the lower end of the protective cover body. Marine structure protection cover assembly comprising a member and a fastening member for fastening both sides of the stopper. Coupling a first cover flange having a first flange extension and a first flange base to the protective cover body; Coupling a second cover flange having a second flange extension and a second flange base to the protective cover body; Wrapping the protective cover body coupled to the first cover flange and the second cover flange on an outer side of the marine structure exposed to seawater; And, Watertight between the engagement surface of the first flange extension and the engagement surface of the second flange extension while the first protrusion provided on the first flange extension and the second protrusion provided on the second flange extension are deformed by an external force. And coupling the first flange extension and the second flange extension to maintain water. The method of claim 11, And installing a stopper unit at a lower portion of the protective cover body to prevent the protective cover body from flowing down to the lower portion of the protective cover body. 13. The method according to claim 11 or 12, Marine protection structure further comprises the step of wrapping the outer surface of the protective cover body and the fastening band penetrating the first flange extension and the second flange extension to prevent the protective cover body from flowing down to the lower portion How to install the cover assembly.

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