KR101625824B1 - Vessel - Google Patents

Abstract

The vessel is started. A ship according to an embodiment of the present invention is a ship including a hull equipped with a moonpool, wherein the moorpool comprises: an inner hull installed and fixed inside for watertightness; And an outer hull which is installed outside the inner hull and has an inclined surface to be adjusted.

Description

Ship {VESSEL}

The present invention relates to a ship, and more particularly, to a ship capable of reducing the resistance in the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior, .

In general, an offshore structure is a structure that is installed on the sea or under the sea. It is classified into fixed type, semi-submerged type, floating type according to depth, and mainly used for marine work such as exploration and extraction of energy source such as oil or natural gas .

Here, the offshore structures are equipped with drilling equipment, etc., and are used to develop underwater oil fields.

On the other hand, due to the increase of oil usage due to industrialization, development of marginal field or deep-sea oil field which is not economically feasible has become economical. With the development of submarine mining technology, And a drill rig equipped with the drill rig has been developed and used.

Here, the drill ship includes various types of ships. For example, it is possible to use a tug boat that can be sailed by another tugboat, and a submarine drilling rig a so-called drill ship has been developed for use in subsea drilling, which is constructed in the same form as a general ship so that it can be equipped with a rig ship, a fixed platform and advanced drilling equipment and can navigate by its own power

Here, a moonpool for lowering the drilling pipe or the like to the sea floor may be formed at the center of the drill ship.

This type of portal is indispensable in terms of the use of the ship, but it is very disadvantageous in terms of vessel anchorage, navigation stability and navigation performance.

That is, due to the sloshing phenomenon caused by the relative flow of seawater flowing into the interior of the door and the sea water outside the hull, there is a problem that the resistance increases, the speed decreases, the required horsepower increases, the fuel consumption increases, Damage and so on.

In order to solve such a problem, in the conventional case, a method of reducing the resistance by forming an inclined surface in the back of the door has been applied.

However, in the case of ships, the line speed and the draft vary depending on the operating conditions. If the inclined plane behind the platform is fixed as in the prior art, resistance may increase when the line speed and draft vary in various operating conditions there was.

Korea Patent Publication No. 10-2012-0018902 (Open date: March 06, 2012)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an air conditioner which is capable of reducing the resistance in the interior of a door frame by changing the inclination of the rear of the doorway, Thereby improving the efficiency and reducing the cost.

According to an aspect of the present invention, there is provided a ship including a hull equipped with a Moonpool, the hull having an Inner Hull installed and fixed inside for watertightness; And an outer hull provided outside the inner hull and having an inclined surface to be adjusted.

In addition, the out-hull includes an upper outer wall unit mounted on an upper side and driven; And a lower outer wall unit installed on the lower side of the upper outer wall unit and connected to the upper outer wall unit.

The upper outer wall unit may be configured to be driven in the vertical direction, and the lower outer wall unit may be configured to be driven in the lateral direction.

The upper outer wall unit may include an upper outer wall bent portion bent at a predetermined angle, and the lower outer wall unit may include a lower outer wall bent portion bent at a predetermined angle.

In addition, the upper outer wall unit may further include at least one upper outer wall turning portion that is rotatably coupled.

The upper outer wall unit may further include an upper outer wall sliding portion including an upper outer wall bending portion bent at a predetermined angle, and slidably coupled to the upper outer wall bending portion.

The out-hull includes an upper outer wall unit installed on the upper side and driven in a vertical direction; And a lower outer wall unit installed on the lower side of the upper outer wall unit and connected to the upper outer wall unit, wherein the lower outer wall unit may further include a lower outer wall turning unit rotatably coupled.

The upper outer wall unit may include an upper outer wall bent portion bent at a predetermined angle.

Embodiments of the present invention are designed such that the inclination of the rear side of the door frame is varied to change the ship's line speed and draft according to the operating conditions to reduce the resistance in the interior of the doorway and thereby improve the energy efficiency Thereby reducing costs.

1 (a) and 1 (b) are schematic cross-sectional side views of a ship according to the first to fourth embodiments of the present invention.
2 (a) and 2 (b) are views showing a process of adjusting the inclined plane of the door in the ship according to the first embodiment of the present invention.
3 (a) and 3 (b) are views showing an example of a process of adjusting a slope of a door frame in a ship according to a second embodiment of the present invention.
4 (a) and 4 (b) are views showing another example of a process of adjusting a slope of a door frame in a ship according to a second embodiment of the present invention.
5 (a) to 5 (c) are views showing another example of a process of adjusting the inclined plane of the door frame in the ship according to the second embodiment of the present invention.
6 (a) and 6 (b) are views showing a process of adjusting the slope of a door frame in a ship according to a third embodiment of the present invention.
7 (a) and 7 (b) are views showing a process of adjusting the inclined plane of the door frame in the ship according to the fourth embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

The terms " one side " and " other side " used in this specification may mean a specified side, or do not mean a specified side, but any side of a plurality of sides may be referred to as one side, And the other side is referred to as the other side.

Further, the term " bonding " or " connection ", as used herein, refers not only to a case where one member and another member are directly bonded or connected directly, but also when one member is indirectly bonded to another member through a joint member , Or indirectly connected.

In the meantime, the vessel 100 used in the present invention includes all vessels 100 that carry a person or a cargo with a self-propelled ability such as a commercial vessel, a warship, a fishing vessel, a carrier vessel, a drill ship, a cruise vessel, , Floating Production Storage Offloading (FPSO), and Floating Storage Unit (FSU), which can store and unload cargoes.

A ship 100 according to an embodiment of the present invention is a ship 100 including a hull 110 having a moonpool 120. The hull 120 is installed inside and fixed The outer hull 200, 400, 600, and 800 are installed on the inner hull 200, 400, 600, and 800 and the outer hull 300, 500, 700, 900).

1 (a) and 1 (b) are schematic cross-sectional side views of a ship according to the first to fourth embodiments of the present invention.

1 (a) and 1 (b), the hull 110 can be divided into a forward portion, a central parallel portion, and a stern portion along the longitudinal direction, and the cargo can be loaded on the hull 110, , A worker or the like can be formed.

The drum 120 may be formed on the hull 110 so that a drill pipe (not shown) drilling oil or gas existing under the seabed may be moved up and down to be drilled.

The drapery 120 may be located midway between the bow and the stern of the drill ship and the derrick may be installed at the upper portion of the drainer 120 so that the drainer 120 may be installed using drilling equipment and drilling pipes The drilling operation can be performed in the space formed by the openings.

1 (a) and 1 (b), the door frame 120 is attached to the inner hulls 200, 400, 600, 800 and the inner hulls 200, 400, 600, And an out hull 300, 500, 700, 900 installed therein.

The inner hulls 200, 400, 600, and 800 are provided to be fixed inside the out hulls 300, 500, 700, and 900 for water tightness. That is, when the out hulls 300, 500, 700, and 900 are moved to adjust the inclined surfaces, the inside of the out hulls 300, 500, 700, Water may be introduced into the outer hulls 300, 500, 700, and 900 to prevent water that has flowed into the outer hulls 300, 500, 700, The inner hulls 200, 400, 600, and 800 may be installed.

Here, the inner hulls 200, 400, 600, and 800 may be provided in a structure for watertightness, and sealing members (not shown) for watertightness may be coupled to the inner hulls 200, 400, 600, .

Out hulls 300, 500, 700, and 900 are provided outside the inner hulls 200, 400, 600, and 800 to adjust the inclined surfaces. In other words, as described above, since the ship 100 and the ship 100 are different in the line speed and the draft according to the operating conditions, the outflow 300, 500, 700 , 900 can be adjusted.

That is, the slopes of the out hulls 300, 500, 700, and 900 are adjusted according to the line speed and the draft in the operating conditions, thereby minimizing the resistance.

Here, the adjustment of the inclined plane of the out hulls 300, 500, 700, and 900 may adjust the inclined area of the inclined plane, or the inclination angle formed by the inclined plane and the water surface.

2 (a) and 2 (b) are views showing a process of adjusting the inclined plane of the door frame 120 in the ship 100 according to the first embodiment of the present invention. This will be described in detail with reference to FIG. 2 (b).

2 (a) and 2 (b), the outhall 300 may include an upper outer wall unit 310 and a lower outer wall unit 320. [

Here, the upper outer wall unit 310 may be installed on the upper side relative to the lower outer wall unit 320 to be driven. The upper outer wall unit 310 may be arranged to be vertically arranged to be driven in the vertical direction.

The lower outer wall unit 320 may be installed below the upper outer wall unit 310 to be driven. In addition, the lower outer wall unit 320 may be arranged to be horizontally arranged to be driven in the lateral direction.

Here, the lower outer wall unit 320 may be overlapped with the upper outer wall unit 310, or the ends thereof may contact the upper outer wall unit 310 to be interconnected.

The upper outer wall unit 310 includes an upper outer wall vertical portion 311 arranged in the longitudinal direction and an upper outer wall bent portion 312 bent at a predetermined angle at the end of the upper outer wall vertical portion 311 Lt; / RTI >

The lower outer wall unit 320 includes a lower outer wall horizontal portion 321 arranged in the lateral direction and a lower outer wall bent portion 322 bent at a predetermined angle at the end of the lower outer wall horizontal portion 321 .

The upper outer wall unit 310 and the lower outer wall unit 320 may be connected to various driving sources and the upper outer wall unit 310 and the lower outer wall unit 320 may be connected to a hydraulic cylinder 121, respectively.

2 (a), when the upper outer wall vertical portion 311 is moved in the downward direction and the lower outer wall horizontal portion 321 is moved in the leftward direction, the upper outer wall folding Since the outward hull 300 has the shortest slope A of the slope of the outhull 300 at this time, the slope of the slope of the slope of the outer hull 300, The smallest area is.

When the upper outer wall vertical portion 311 moves upward and the lower outer wall horizontal portion 321 moves in the right direction, the upper outer wall bending portion 312 and the lower outer wall bending portion 322 are overlapped The slope of the outhull 300 becomes long and the area of the slope of the outhull 300 increases.

2 (b), when the upper outer wall vertical portion 311 moves all the way upward and the lower outer wall horizontal portion 321 moves all the rightward direction, the upper outer wall bent portion 312, The outermost portion of the outer hull 300 has the largest slope of the slope of the outer hull 300 and the slope of the slope of the outer hull 300 is the longest.

That is, the upper outer wall unit 310 is driven in the vertical direction and the lower outer wall unit 320 is driven in the lateral direction to change the area of the inclined plane of the outhall 300, It is possible to reduce the resistance of the inside of the door frame 120 by controlling the area of the inclined surface of the outhair 300 with respect to the line speed and the draft of the ship 100.

Hereinafter, in the ship 100 according to the second embodiment of the present invention, the inclination of the back of the platform relative to changes in the ship's line speed and draft according to the operating conditions is varied so as to reduce the resistance inside the platform, And a part common to the contents described in the vessel 100 according to the first embodiment of the present invention is replaced with the above description.

3 (a) and 3 (b) are views showing an example of a process of adjusting the inclined plane of the door frame 120 in the ship 100 according to the second embodiment of the present invention.

In the second embodiment of the present invention, the inner hull 400 is installed and fixed inside for water tightness, and the outhull 500 is provided to include the upper outer wall unit 510 and the lower outer wall unit 520 , The upper outer wall unit 510 is driven in the vertical direction, and the lower outer wall unit 520 is driven in the left and right direction.

However, in the first embodiment, the upper outer wall unit 310 includes the upper outer wall bending portion 312 and the lower outer wall unit 320 includes the lower outer wall bending portion 322 (FIGS. 2 (a) and 2 2 (b)). In the second embodiment, the upper outer wall unit 510 and the lower outer wall unit 520 are not provided with an upper outer wall bend and a lower outer wall bend (Figs. 3 (a) and 3 b)). Here, it is noted that the lower outer wall unit 720 may be formed with a lower outer wall bend portion if necessary.

Meanwhile, in the case of the second embodiment, the upper outer wall unit 510 may include one or more upper outer wall pivot portions 512, 513 pivotally coupled. However, for convenience of explanation, the following description will be focused on the case where there are two upper outer wall turning portions 512 and 513.

3 (a) and 3 (b), the upper outer wall unit 510 may include an upper outer wall vertical portion 511 as in the first embodiment, The first upper outer wall turning portion 512 may be rotatably coupled. A second upper outer wall turning portion 513 may be rotatably coupled to an end portion of the first upper outer wall turning portion 512. Here, the lower outer wall unit 520 may be provided as a lower outer wall horizontal portion 521.

3 (a), when the upper outer wall vertical portion 511 is moved downward and the lower outer wall horizontal portion 521 is moved in the leftward direction, the second upper outer wall turning portion 513 And the end of the first upper outer wall turning portion 512 and the end of the second upper outer wall turning portion 513 are in contact with the lower outer wall lateral portion 521 to be connected to the first upper outer wall turning portion 512, do. At this time, since the slope C of the slope of the outhull 500 is the shortest, the area of the slope of the outhull 500 becomes the smallest.

3 (b), when the upper outer wall vertical portion 511 moves all the way upward and the lower outer wall horizontal portion 521 moves all the way to the right, the second upper outer wall turning portion 513 are pivoted so as to unfold from the first upper outer wall turning portion 512 and the end portion of the second upper outer wall turning portion 513 is in contact with and connected to the lower outer wall lateral portion 521. [ At this time, since the slope D of the slope of the outhull 500 is the longest, the area of the slope of the outhull 500 becomes the largest.

That is, when the upper outer wall unit 510 is driven in the vertical direction and the lower outer wall unit 520 is driven in the left and right direction, the first upper outer wall rotation unit 512 and the second upper outer wall rotation unit 513 are rotated The area of the slant surface of the outhull 500 can be changed by adjusting the area of the slant surface of the outhull 500 with respect to the line speed and draft of the ship 100 according to the operating conditions of the ship 100, The effect of reducing the resistance is obtained.

4A and 4B are views showing another example of the process of adjusting the inclined plane of the door frame 120 in the ship 100 according to the second embodiment of the present invention.

4A and 4B, when the moving lengths of the upper outer wall vertical portion 511 and the lower outer wall horizontal portion 521 are adjusted, the first upper outer wall turning portion 512, And the second upper outer wall turning portion 513 so as to adjust the size of the angle [theta] 1.

Thereby, there is an effect of reducing the resistance by changing the angle and the area where the water hits the sloped surface of the outhull 500 according to the operating condition of the ship 100. [

5 (a) to 5 (c) are views showing another example of the process of adjusting the slope of the door frame 120 in the ship 100 according to the second embodiment of the present invention.

5A, the upper outer wall vertical portion 511 is moved upward, the lower outer wall horizontal portion 521 is moved to the left, and the second upper outer wall turning portion 513 is moved And is rotated to unfold all from the one upper outer wall turning portion 512. In this case, the inclination angle [theta] 2 between the inclined plane of the outhull 500 and the water surface may have a value larger than the inclination angle [theta] 5 between the inclined plane of the inner hull 400 and the water surface.

5 (b), the upper outer wall vertical portion 511 and the lower outer wall horizontal portion 521 are driven to have the same length, and the second upper outer wall turning portion 513 And is rotated so as to extend from the first upper outer wall turning portion 512. In this case, the inclination angle [theta] 3 between the inclined surface of the outhull 500 and the water surface may be equal to the inclination angle [theta] 5 between the inclined surface of the inner hull 400 and the water surface.

5 (c), the upper outer wall vertical portion 511 is moved downward, the lower outer wall horizontal portion 521 is moved to the right, the second upper outer wall turning portion 513, And the first upper outer wall rotation unit 512 is rotated. In this case, the inclination angle [theta] 4 between the inclined surface of the outhull 500 and the water surface may have a value smaller than the inclination angle [theta] 5 between the inclined surface of the inner hull 400 and the water surface.

That is, the inclination angle of the inclined surface of the outhull 500 can be changed by adjusting the range in which the upper outer wall vertical portion 511 is driven in the vertical direction and the range in which the lower outer wall horizontal portion 521 is driven in the horizontal direction And the inclination angle of the inclined surface of the outhair 500 with respect to the line speed and the draft of the ship 100 according to the operating conditions of the ship 100, thereby reducing the resistance inside the doorpane 120.

Hereinafter, in the ship 100 according to the third embodiment of the present invention, an inclined surface at the rear of the door frame is varied so as to reduce the resistance in the interior of the door frame with respect to changes in the ship's line speed and draft, And effects of the present invention will be described below. However, the parts common to those described in the ship 100 according to the first and second embodiments of the present invention are replaced with the above description.

6A and 6B are views illustrating a process of adjusting the inclined plane of the door frame 120 in the ship 100 according to the third embodiment of the present invention.

In the third embodiment of the present invention, the inner hull 600 is installed and fixed inside for watertightness, and the out hull 700 is provided to include the upper outer wall unit 710 and the lower outer wall unit 720 , The upper outer wall unit 710 is driven in the vertical direction, and the lower outer wall unit 720 is provided in the left and right direction, as in the first and second embodiments.

In the third embodiment, similarly to the first embodiment, the upper outer wall unit 710 includes an upper outer wall vertical portion 711 and a lower outer wall vertical portion 711 at a predetermined angle And an upper outer wall bent portion 712 bent.

However, in the third embodiment, the lower outer wall unit 720 is not provided with the lower outer wall bending portion, and the lower outer wall horizontal portion 721 may be provided. Here, it is noted that the lower outer wall unit 720 may be formed with a lower outer wall bend portion if necessary.

In the third embodiment, the upper outer wall unit 710 includes the upper outer wall bending portion 712, and the upper outer wall sliding portion 713 includes the upper outer wall bending portion 712, Lt; / RTI >

6 (a) and 6 (b), the upper outer wall sliding portion 713 is overlapped with the upper outer wall bent portion 712 so as to be slidably coupled. Here, the upper outer wall sliding portion 713 may be slid and connected to the lower outer wall horizontal portion 721.

6A, when the upper outer wall vertical portion 711 is moved in the downward direction and the lower outer wall horizontal portion 721 is moved in the left direction, the upper outer wall sliding portion 713 is in contact with the upper outer wall portion 711, The end of the upper outer wall bent portion 712 and the end of the upper outer wall sliding portion 713 are in contact with and connected to the lower outer wall lateral portion 721. [ At this time, since the inclination E of the outhill hull 700 is the shortest, the area of the slanted face of the out hull 700 is the smallest.

6 (b), when the upper outer wall vertical portion 711 moves all the way upward and the lower outer wall horizontal portion 721 moves all the rightward direction, the upper outer wall sliding portion 713, And the upper end of the upper outer wall sliding portion 713 is in contact with and connected to the lower outer wall lateral portion 721. As shown in FIG. At this time, since the slope F of the slope of the outer hull 700 is the longest, the area of the slope of the outer hull 700 becomes the largest.

That is, the upper outer wall unit 710 is driven in the vertical direction and the lower outer wall unit 720 is driven in the left and right direction, and the upper outer wall sliding portion 713 is slid to change the area of the slanted surface of the outhull 700 And,

There is an effect that the resistance in the interior of the interior space 120 is reduced by adjusting the area of the inclined surface of the outhield 700 with respect to the line speed and draft of the ship 100 according to the operating conditions of the ship 100. [

Hereinafter, in the ship 100 according to the fourth embodiment of the present invention, an inclined surface at the rear of the door frame is varied so as to reduce the resistance in the interior of the door frame with respect to changes in ship speed, draft, And effects of the present invention will be described. However, the parts common to those described in the ship 100 according to the first to third embodiments of the present invention are replaced with the above description.

7A and 7B are views showing a process of adjusting the inclined plane of the door frame 120 in the ship 100 according to the fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the inner hull 800 is installed and fixed inside for water tightness, and the outhull 900 is provided to include the upper outer wall unit 910 and the lower outer wall unit 920 And the upper outer wall unit 910 are installed on the upper side and are driven in the vertical direction are the same as in the first to third embodiments.

In the fourth embodiment, similarly to the first embodiment, the upper outer wall unit 910 has an upper outer wall vertical portion 911 arranged in the longitudinal direction and a lower outer wall vertical portion 911 at a predetermined angle at the end of the upper outer wall vertical portion 911 And an upper outer wall bent portion 912 bent.

7A and 7B, the lower outer wall unit 920 is installed on the lower side of the upper outer wall unit 910 and includes a lower outer wall horizontally arranged in the horizontal direction but not driven in the horizontal direction And a lower outer wall turning portion 922 rotatably coupled to an end portion of the lower outer wall lateral portion 921. [ Here, the lower outer wall turning portion 922 may be connected to the upper outer wall bending portion 912.

7A, when the upper outer wall vertical portion 911 is moved in the downward direction, the lower outer wall turning portion 922 rotatably coupled to the lower outer wall horizontal portion 921 has the lower outer wall 921, (In a counterclockwise direction with reference to Fig. 7 (a)) extending from the transverse portion 921 and is brought into contact with the upper outer wall bent portion 912 and connected. At this time, since the slope G of the slope of the outhull 900 is the shortest, the area of the slope of the outhull 900 becomes the smallest.

7A, the angle? 6 between the lower outer wall turning portion 922 and the upper outer wall bent portion 912 can be adjusted.

7 (b), the upper outer wall vertical portion 911 moves in the upward direction, and the lower outer wall turning portion 922 moves in the direction in which the lower outer wall vertical portion 911 overlaps the lower outer wall horizontal portion 921 , The area of the inclined surface of the outhull 900 gradually becomes larger because the inclined surface H of the outhull 900 is gradually increased in length.

That is, the upper outer wall unit 910 is driven in the vertical direction and the lower outer wall rotary unit 922 is rotated, thereby changing the area and angle of the inclined plane of the outhull 900, The area of the slant surface of the outhull 900 can be adjusted with respect to the line speed, draft, etc. of the ship 100 according to the shape of the ship.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: ship 110: hull
120: a slide 121: a hydraulic cylinder
200: Inner Hull 300: Out Hull
310: upper outer wall unit 311: upper outer wall vertical portion
312: upper outer wall bent portion 320: lower outer wall unit
321: Lower side outer wall horizontal portion 322: Lower outer wall bending portion
400: Inner Hull 500: Out Hull
510: upper outer wall unit 511: upper outer wall vertical portion
512: first upper outer wall turning portion 513: second upper outer wall turning portion
520: lower outer wall unit 521: lower outer wall horizontal portion
600: Inner Hull 700: Out Hull
710: upper outer wall unit 711: upper outer wall vertical portion
712: upper outer wall bending portion 713: upper outer wall sliding portion
720: lower outer wall unit 721: lower outer wall horizontal portion
800: Inner Hull 900: Out Hull
910: upper outer wall unit 911: upper outer wall vertical portion
912: upper outer wall bending portion 920: lower outer wall unit
921: lower outer wall horizontal portion 922: lower outer wall turning portion

Claims (8)

A ship containing a hull equipped with a Moonpool,
[0034]
An inner hull installed inside and fixed for water tightness; And
And an outer hull provided outside the inner hull and having an inclined surface to be adjusted,
The out-
An upper outer wall unit installed on the upper side and driven; And
And a lower outer wall unit installed on the lower side of the upper outer wall unit and connected to the upper outer wall unit. delete The method according to claim 1,
Wherein the upper outer wall unit is adapted to be driven in the vertical direction and the lower outer wall unit is arranged to be driven in the lateral direction. The method of claim 3,
Wherein the upper outer wall unit includes an upper outer wall bent portion bent at a predetermined angle, and the lower outer wall unit includes a lower outer wall bent portion bent at a predetermined angle. The method of claim 3,
Wherein the upper outer wall unit further comprises at least one upper outer wall pivotal portion rotatably coupled. The method of claim 3,
Wherein the upper outer wall unit further includes an upper outer wall sliding portion including an upper outer wall bent portion bent at a predetermined angle and slidably coupled to the upper outer wall bent portion. A ship containing a hull equipped with a Moonpool,
[0034]
An inner hull installed inside and fixed for water tightness; And
And an outer hull provided outside the inner hull and having an inclined surface to be adjusted,
The out-
An upper outer wall unit installed on the upper side and driven in a vertical direction; And
And a lower outer wall unit installed below the upper outer wall unit and connected to the upper outer wall unit,
Wherein the lower outer wall unit further comprises a lower outer wall pivoting portion that is rotatably coupled. 8. The method of claim 7,
Wherein the upper outer wall unit includes an upper outer wall bent portion bent at a predetermined angle.

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