KR102606579B1 - Offshore structure - Google Patents

Abstract

Offshore structures are disclosed. The marine structure according to an embodiment of the present invention includes a main body; A cantilever is installed on the main body, supports a derrick equipped with work equipment, and is provided to be movable on the main body; and a staircase providing a passage for workers to move between the cantilever and the deck on the main body. The staircase is provided to be rotatable in the horizontal direction depending on the position of the cantilever.

Description

Offshore structure{OFFSHORE STRUCTURE}

The present invention relates to marine structures, and more specifically, to marine structures having a moving passage (stair) between a deck and a cantilever for moving a derrick equipped with work equipment.

A jack-up rig that performs drilling operations in the ocean is equipped with a cantilever to move the drilling device longitudinally (forward-to-aft direction) and/or transversely. There are stairs between the cantilever and the main deck of the jack-up rig for workers to move from the deck to the cantilever or from the cantilever to the deck. However, when the cantilever is moved, for example, when the cantilever moves from a working position on the stern side to a waiting position on the bow side, the stairs installed on the cantilever interfere with bow-side structures on the deck, for example, living quarters, etc. It can be. Even when the cantilever moves laterally, interference may occur if there are structures on the left and right sides of the stairs. Accordingly, conventionally, stairs installed on a cantilever are designed to be detachable, and when interference with a structure occurs while the cantilever is moving, the stairs are separated from the cantilever. However, there is a problem in that work manpower is wasted and work time is delayed due to this stair separation operation.

The present invention is intended to provide a marine structure that can prevent interference between structures on the deck and steps that serve as a passageway between the cantilever and the deck when the cantilever moves.

In addition, the present invention is intended to provide a marine structure that corrects the height difference between the staircase and the deck when rotating the staircase connecting the cantilever and the deck, allowing workers to efficiently move between the cantilever and the deck in a safer environment. .

The problem to be solved by the present invention is not limited to the problems mentioned above. Other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The marine structure according to one aspect of the present invention includes a main body; a cantilever installed on the main body, supporting a derrick equipped with work equipment, and provided to be movable on the main body; and a step portion providing a passage for the worker to move between the cantilever and the deck on the main body, wherein the step portion is provided to be rotatable in the horizontal direction depending on the position of the cantilever.

The upper end of the staircase is rotatably coupled to the cantilever, and the lower end of the staircase may be in rolling contact with the deck.

The step portion includes a first support portion having a first support pin fixed to the cantilever; a first rotating plate inserted into the first support pin; a first staircase, one end of which is fixed to the first rotating plate; a second support portion provided at the other end of the first staircase and including a second support pin; a second rotating plate inserted into the second support pin; a second staircase whose top is fixed to the second rotating plate; and a moving wheel provided at the bottom of the second staircase.

The staircase adjusts the height of at least one of the second support part and the second staircase according to a change in height between the cantilever and the deck when at least one of the first staircase and the second staircase rotates. It may further include a height adjustment unit that corrects the step between the unit and the deck.

The marine structure includes a first driving unit that rotates the first rotating plate according to a first driving value; a second driving unit that rotates the second rotating plate according to a second driving value; a third driving unit that lifts and drives the height adjustment unit according to a third driving value; a position detection unit that detects the position of the cantilever; and a control unit that calculates the first drive value, the second drive value, and the third drive value according to the position of the cantilever and the height profile of the deck.

According to an embodiment of the present invention, an offshore structure is provided that can prevent interference between structures on the deck and a staircase that serves as a passageway between the cantilever and the deck when the cantilever moves.

In addition, according to an embodiment of the present invention, there is a marine structure that corrects the height difference between the staircase and the deck when rotating the staircase connecting the cantilever and the deck, allowing workers to efficiently move between the cantilever and the deck in a safe environment. provided.

The effects of the present invention are not limited to the effects described above. Effects not mentioned can be clearly understood by those skilled in the art from this specification and the attached drawings.

1 is a side view schematically showing an offshore structure according to an embodiment of the present invention.
Figure 2 is a plan view of a staircase constituting an offshore structure according to an embodiment of the present invention.
Figure 3 is an enlarged perspective view of part 'A' in Figure 2.
Figure 4 is a side view of a first support part constituting an offshore structure according to an embodiment of the present invention.
Figure 5 is a plan view of a first rotating plate constituting an offshore structure according to an embodiment of the present invention.
Figure 6 is a cross-sectional view taken along line 'BB' in Figure 5.
Figure 7 is a cross-sectional view taken along line 'CC' in Figure 6.
Figure 8 is a plan view of a second support part constituting an offshore structure according to an embodiment of the present invention.
Figure 9 is a side view of a second support part constituting an offshore structure according to an embodiment of the present invention.
Figure 10 is a cross-sectional view taken along line 'DD' in Figure 9.
Figure 11 is a plan view of a second rotating plate constituting an offshore structure according to an embodiment of the present invention.
FIG. 12 is a cross-sectional view taken along line 'EE' of FIG. 11.
Figure 13 is a cross-sectional view taken along line 'FF' in Figure 12.
Figure 14 is a side view showing a part of a step part constituting an offshore structure according to an embodiment of the present invention.
Figure 15 is a side view of the height adjustment part constituting the marine structure according to an embodiment of the present invention.
Figure 16 is a cross-sectional view taken along line 'GG' in Figure 15.
Figure 17 is a configuration diagram of a control system constituting an offshore structure according to another embodiment of the present invention.
Figure 18 is a plan view schematically showing a guide rail constituting an offshore structure according to another embodiment of the present invention.

Other advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and the present invention is only defined by the scope of the claims. Even if not defined, all terms (including technical or scientific terms) used herein have the same meaning as generally accepted by the general art in the prior art to which this invention belongs. General descriptions of known configurations may be omitted so as not to obscure the gist of the present invention. In the drawings of the present invention, the same reference numerals are used as much as possible for identical or corresponding components. To facilitate understanding of the present invention, some components in the drawings may be shown somewhat exaggerated or reduced.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise,” “have,” or “equipped with” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. It should be understood that it does not exclude in advance the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

1 is a side view schematically showing an offshore structure according to an embodiment of the present invention. Referring to Figure 1, the offshore structure 100 according to an embodiment of the present invention includes a main body 110, a plurality of legs 120, a jacking unit 130, a cantilever 140, a derrick 150, and a wellhead ( 160), residential equipment 170, and stairs 180.

For example, the offshore structure 100 is equipped with work equipment such as terminal equipment for exploration, collection, drilling, processing, refining, regasification, storage or transportation of crude oil, gas, submarine minerals, etc., and is used for marine work purposes. can be performed.

In the example shown in FIG. 1 , the offshore structure 100 is provided to drill crude oil from a wellhead 160 on the seafloor 10 through a riser pipe 152 . The offshore structure 100 may be provided as a jack-up platform or jack-up rig for crude oil drilling, but the present invention may also be applied to various offshore structures not illustrated.

The main body 110 may be provided as a floating body that can float on the sea. The main body 110 may be provided with a deck 112 on its upper surface.

Legs 120 are installed to be raised and lowered relative to the main body 110. The main body 110 may float on the sea before being jacked up by the legs 120, and may be supported by the legs 120 after being jacked up by the legs 120. The leg 120 is installed on the main body 110 to be movable in the vertical direction.

The legs 120 are installed to penetrate the main body 110 in the vertical direction and are formed to have sufficient rigidity to withstand the load of the main body 110 in a jack-up state. The legs 120 may be formed in a cylindrical structure, a square truss structure, a triangular truss structure, or various other shapes.

The jacking unit (130) is configured to move the leg (120) relative to the main body (110) in the vertical direction. The jacking unit 130 may be composed of a motor, a pinion gear, etc., and may be combined with a rack gear formed on the leg 120 to elevate the leg 120.

A cantilever 140 is installed on the main body 110. The cantilever 140 may be installed on the stern portion of the main body 110. A derrick (150) is installed on the cantilever (140). Derrick 150 may be equipped with equipment for offshore operations, for example a drilling rig.

The cantilever 140 has a skid box coupled to the skid rails 142 and 144, and can be provided to be movable in the longitudinal direction (fore-aft direction, X) and the transverse direction (Y).

A living quarter (170) is installed on the main body (110). The living facility 170 serves as a living area for workers. In one embodiment, accommodation 170 may be installed at the bow.

The staircase 180 provides a passage for workers to move between the cantilever 140 and the deck 112. When the cantilever 140 moves along the longitudinal direction

In an embodiment of the present invention, the step portion 180 is provided to be rotatable in the horizontal direction to a position that does not interfere with the structure on the deck 112, depending on the position of the cantilever 140 when the cantilever 140 is moved.

Figure 2 is a plan view of a staircase constituting an offshore structure according to an embodiment of the present invention. Referring to FIGS. 1 and 2 , in order to smoothly adjust the rotation angle and freely change direction, the step portion 180 may be provided in a structure in which a plurality of steps are combined into multiple steps.

In one embodiment, the step portion 180 includes a first support portion 181, a first rotating plate 182, a first step 183, a second support portion 184, a second rotating plate 185, and a second step ( 186) and a moving wheel 187.

The upper end of the step portion 180 may be rotatably coupled to the cantilever 140. For smooth rotation of the step portion 180, the lower end of the step portion 180 may be in rolling contact with the deck 112 by the moving wheel 187.

Figure 3 is an enlarged perspective view of part 'A' in Figure 2. Figure 4 is a side view of a first support part constituting an offshore structure according to an embodiment of the present invention. 2 to 4, the first support part 181 includes a first support pin 181a, a first support member 181b, and a friction reduction member 181c.

The first support member 181b may be coupled to the upper side of the cantilever 140. The first support member 181b may be provided as a reinforcing member such as an H beam. The first support pin 181a may be installed on the upper surface of the distal end of the first support member 181b to protrude in an upward direction. The top of the first support pin 181a may be tapered so that the first rotating plate 182 can be smoothly inserted. The friction reduction member 181c may be inserted in a ring shape around the first support pin 181a to reduce contact friction with the first rotating plate 182.

Figure 5 is a plan view of a first rotating plate constituting an offshore structure according to an embodiment of the present invention. Figure 6 is a cross-sectional view taken along line 'B-B' in Figure 5. Figure 7 is a cross-sectional view taken along line 'C-C' in Figure 6.

Referring to Figures 4 to 7, the first rotating plate 182 is inserted into the first support pin (181a). The first rotating plate 182 may be provided as a first disk plate 182a having a disk shape. In one embodiment, the first rotating plate 182 may be provided to rotate at an angle of 0 to 130°. The first disk plate 182a may have a first coupling hole 182b through which the first support pin 181a is inserted in the center.

The first disk plate 182a may have a plurality of first coupling grooves 182d formed along the circumference of the upper surface into which the first handrail 182c can be detachably coupled. By adjusting the position of the first coupling groove (182d) where the first handrail (182c) is coupled according to the rotation angle of the first disk plate (182a), it is possible to prevent safety accidents and secure a moving passage toward the cantilever (140). You can.

A friction reduction member 182f may be provided on the lower surface of the first rotating plate 182 to reduce frictional contact with the first support portion 181. The friction reduction member 182f of the first rotating plate 182 may be disposed at a position in opposing contact with the friction reduction member 181c of the first support portion 181.

A plurality of first insertion holes 182e may penetrate the first rotating plate 182 at predetermined intervals along its peripheral direction. One or a plurality of second insertion holes 181d may be formed in the first support portion 181. The first insertion hole 182e and the second insertion hole 181d may be formed at the same distance from the first support pin 181a.

The first stopper pin (not shown) is inserted into the first insertion hole 182e and the second insertion hole 181d to fix the first rotating plate 182 and the first support portion 181. The angle of the first rotating plate 182 may be adjusted depending on the position where the first stopper pin is inserted among the plurality of first insertion holes 182e.

The angle of the first rotating plate 182 can be adjusted with the first stopper pin separated from the first insertion hole 182e and the second insertion hole 181d. Thereafter, the direction of the first rotating plate 182 is changed by inserting the first stopper pin into the first insertion hole 182e and the second insertion hole 181d while the first rotating plate 182 is rotated in the desired direction. can be fixed.

In the illustrated example, the first insertion hole 182e and the second insertion hole 181d are formed at 10° intervals, and in this case, the angle of the first rotating plate 182 can be adjusted at 10° intervals. However, since this is an example, the angle of the first rotating plate 182 can be adjusted at various intervals by adjusting the number and spacing of the first insertion holes 182e and the second insertion holes 181d.

The top of the first step 183 is fixed to the first rotating plate 182. The first step 183 may be rotated around the first support pin 181a together with the first rotating plate 182.

Figure 8 is a plan view of a second support part constituting an offshore structure according to an embodiment of the present invention. Figure 9 is a side view of a second support part constituting an offshore structure according to an embodiment of the present invention. Figure 10 is a cross-sectional view taken along line 'D-D' in Figure 9. 8 to 10, the second support part 184 includes a second support pin 184a, a second support member 184b, and a friction reduction member 184c.

The second support member 184b may be coupled to the lower end of the first step 183. The second support member 184b may be provided as a reinforcing member such as an H beam. The second support pin 184a may be installed on the upper surface of the distal end of the second support member 184b to protrude in an upward direction. The upper end of the second support pin 184a may be tapered so that the second rotating plate 185 can be smoothly inserted. The friction reduction member 184c may be inserted in a ring shape around the second support pin 184a to reduce contact friction with the second rotating plate 185.

Figure 11 is a plan view of a second rotating plate constituting an offshore structure according to an embodiment of the present invention. FIG. 12 is a cross-sectional view taken along line 'E-E' of FIG. 11. Figure 13 is a cross-sectional view taken along line 'F-F' of Figure 12.

8 to 13, the second rotating plate 185 is inserted into the second support pin 184a. The second rotating plate 185 may be provided as a second disk plate 185a having a disk shape. In one embodiment, the second rotating plate 182 may be provided to rotate an angle of -90 to 90° (180° range). The second disk plate 185a may have a second coupling hole 185b through which the second support pin 184a is inserted in the center.

The second disk plate 185a may have a plurality of first coupling grooves 185d formed along the circumference of the upper surface into which the second handrail 185c can be detachably coupled. By adjusting the position of the first coupling groove (185d) where the second handrail (185c) is coupled according to the rotation angle of the second disk plate (185a), safety accidents are prevented and a movement passage toward the first staircase (183) is created. It can be secured.

A friction reduction member 185f may be provided on the lower surface of the second rotating plate 185 to reduce frictional contact with the second support portion 184. The friction reduction member 185f of the second rotating plate 185 may be disposed at a position in opposing contact with the friction reduction member 184c of the second support portion 184.

A plurality of third insertion holes 185e may penetrate the second rotating plate 185 at predetermined intervals along its peripheral direction. One or a plurality of second insertion holes 184d may be formed in the second support portion 184. The third insertion hole 185e and the fourth insertion hole 184d may be formed at the same distance from the second support pin 184a.

The second stopper pin (not shown) is inserted into the third insertion hole 185e and the fourth insertion hole 184d to fix the second rotating plate 185 and the second support portion 184. The angle of the second rotating plate 185 may be adjusted depending on the position where the second stopper pin is inserted among the plurality of third insertion holes 185e.

The angle of the second rotating plate 185 can be adjusted with the first stopper pin separated from the third insertion hole 185e and the fourth insertion hole 184d. Thereafter, the direction of the second rotating plate 185 is changed by inserting the second stopper pin into the third insertion hole 185e and the fourth insertion hole 184d while the second rotating plate 185 is rotated in the desired direction. can be fixed.

In the illustrated example, the third insertion hole 185e and the fourth insertion hole 184d are formed at 10° intervals, and in this case, the angle of the second rotating plate 185 can be adjusted at 10° intervals. However, since this is an example, the angle of the second rotating plate 185 can be adjusted at various intervals by adjusting the number and spacing of the third insertion hole 185e and the fourth insertion hole 184d.

The second rotating plate 185 may be provided with a coupling portion 185g for coupling the second step 186 through a bracket 185h such as an iPad. The coupling portion 185g may be provided in a cylindrical shape. A space 185i is formed between the coupling portion 185g and the second rotating plate 185 into which the hook member provided at the upper end of the second step 186 can be inserted.

The top of the second step 186 is fixed to the second rotating plate 185. The second step 186 may be rotated around the second support pin 184a together with the second rotating plate 185. A moving wheel 187 may be mounted at the lower end of the second staircase 186.

Figure 14 is a side view showing a part of a step part constituting an offshore structure according to an embodiment of the present invention. Referring to FIG. 14 , a hook member 186b may be provided at the upper end of the second step 186 to be fastened to a cylindrical coupling portion 185g provided on the second rotating plate 184. The connection angle of the second rotating plate 184 and the second step 186 can be adjusted around the coupling portion 185g by the hook member 186b, and the second rotating plate 184 and the second step 186 It is possible to compensate for height differences between livers.

For purposes such as drainage, the deck 112 is designed in a camber shape that slopes downward from the center to the port or right side. In this case, when the first staircase 183 and the second staircase 186 are rotated, between the lower end of the second staircase 186 and the deck 112 according to the change in height between the cantilever 140 and the deck 112. Height discrepancies may occur.

In an embodiment of the present invention, a height adjustment unit 189 is provided to compensate for height deviation that occurs due to rotation of the step unit 180. The height adjustment unit 189 may adjust the height of the second support unit 184 or the second step 186 to correct the step between the step unit 180 and the deck 112.

Figure 15 is a side view of the height adjustment part constituting the marine structure according to an embodiment of the present invention. Figure 16 is a cross-sectional view taken along line 'G-G' in Figure 15. Referring to FIGS. 14 to 16 , the height adjustment unit 189 may be configured to adjust the height of the support 188 supporting the second support 184.

In one embodiment, the height adjustment part 189 is coupled to the upper part of the base 189b supported on the deck 112, and the support 188 penetrates the screw hole 189e of the support plate 189d coupled to the upper part. Thus, it may be composed of a height adjustment rod (189a) extending upward, and a bolt member (189c) coupled to the height adjustment rod (189a).

In the illustrated embodiment, the height of the support plate 188 and the second support portion 184 can be adjusted by tightening the bolt member 189c to adjust the height of the support plate 189d up and down. Therefore, when the step portion 180 rotates according to the movement of the cantilever 140, the step due to the change in height of the deck 112 is compensated to ensure a passage through which workers can move safely.

In the embodiment of Figure 14, the height adjustment unit 189 is configured to adjust the height of the second support portion 184, but is mounted on the second step 186 to adjust the height of the second step 186. It could be.

In an embodiment of the present invention, the first rotating plate 182, the second rotating plate 185, and the height adjusting unit 189 may be manually adjusted by the operator, and the driving unit (e.g., hydraulic motor, hydraulic cylinder, etc. ) can also be automatically adjusted.

In the above, an example in which the first staircase 183 and the second staircase 186 are combined in two stages has been described, but the staircase part 180 is provided as a one-stage structure or has three or more stages. It may also be provided in a multi-tiered structure.

Figure 17 is a configuration diagram of a control system constituting an offshore structure according to another embodiment of the present invention. In the embodiment of FIG. 17, the marine structure is different from the previously described embodiment in that it further includes a control system 190 that automatically controls the step portion 180 according to the position of the cantilever 140.

The control system 190 may include a position detection unit 191, a control unit 192, a first driver 193, a second driver 194, and a third driver 195. The position detection unit 191 can detect the position of the cantilever 140.

The control unit 192 controls the current position of the cantilever 140, the height profile of the deck 112, the current angles of the first rotating plate 182 and the second rotating plate 185, the first step 183, and the second step 186. ), the position of the cantilever 140, the degree of sagging due to its own weight, the design information of the structure interfering with the step 180, etc., to determine the rotation angle of the first rotating plate 182. A drive value, a second drive value for determining the rotation angle of the second rotating plate 185, and a third drive value for driving the height adjustment unit 189 can be calculated.

The first driving unit 193 may rotate and drive the first rotating plate 182 according to the first driving value calculated by the control unit 192. The second driving unit 194 may drive the second rotating plate 185 to rotate according to the second driving value calculated by the control unit 192. The third drive unit 195 may adjust the height by driving the second support unit 184 or the second staircase 186 up and down according to the third drive value calculated by the control unit 192.

The first driving unit 193, the second driving unit 194, and the third driving unit 195 may be provided as driving devices such as hydraulic motors and hydraulic cylinders, but are not limited thereto.

Figure 18 is a plan view schematically showing a guide rail constituting an offshore structure according to another embodiment of the present invention. In describing the embodiment of FIG. 18, redundant description of components that are the same as or correspond to the embodiment described above will be omitted.

Referring to FIG. 18, a guide rail 200 may be installed on the deck 112 to guide the rotation of the step portion 180 in conjunction with the movement of the cantilever 140. The guide rail may be designed in a curved shape, taking into account design information of the interference structure, design information of the step portion 180, etc. In one embodiment, the guide rail 200 is coupled to the moving wheel 187 provided at the lower end of the step portion 180 and guides the moving path of the moving wheel 187.

According to the embodiment of FIG. 18, when the cantilever 140 moves, the step portion 180 is rotated along a predetermined path along the guide rail 200, so that the rotational movement of the step portion 180 can be controlled more stably. .

It should be understood that the above embodiments are provided to aid understanding of the present invention, and do not limit the scope of the present invention, and that various modifications possible thereto also fall within the scope of the present invention. The scope of technical protection of the present invention should be determined by the technical spirit of the patent claims, and the scope of technical protection of the present invention is not limited to the literal description of the claims themselves, but is substantially a scope of equal technical value. It must be understood that this extends to the invention of .

100: Marine structure 110: Main body
112: Deck 120: Leg
130: jacking unit 140: cantilever
142, 144: skid rail 150: derrick
160: wellhead 170: residential equipment
180: step portion 181: first support portion
181a: first support pin 181b: first support member
181c: Friction reduction member 181d: Second insertion hole
182: first rotating plate 182a: first disk plate
182b: first coupling hole 182c: first handrail
182d: first coupling groove 182e: first insertion hole
182f: Friction reduction member 183: First step
183: first railing member 184: second support member
184a: second support pin 184b: second support member
184c: Friction reduction member 184d: Fourth insertion hole
185: second rotating plate 185a: second disk plate
185b: second coupling hole 185c: second handrail
185d: second coupling groove 185e: third insertion hole
185f: Friction reduction member 185h: Bracket
185g: coupling portion 186: second step
186a: second railing member 186b: hook member
187: moving wheel 188: support
189: height adjustment unit 189a: height adjustment rod
189b: Base 189c: Bolt member
189d: support plate 189e: screw hole
190: Control system 191: Position detection unit
192: control unit 193: first driving unit
194: second driving unit 195: third driving unit
200: Guide rail

Claims (5)

main body;
a cantilever installed on the main body, supporting a derrick equipped with work equipment, and provided to be movable on the main body; and
It includes a staircase providing a passage for workers to move between the cantilever and the deck on the main body,
The step portion is provided to be rotatable in the horizontal direction according to the position of the cantilever;
The stairs,
a first support portion having a first support pin fixed to the cantilever;
a first rotating plate inserted into the first support pin;
a first staircase, one end of which is fixed to the first rotating plate;
a second support portion provided at the other end of the first staircase and including a second support pin;
a second rotating plate inserted into the second support pin;
a second staircase whose top is fixed to the second rotating plate;
A moving wheel provided at the bottom of the second staircase;
a first friction reduction member installed on at least one of the first support part and the first rotating plate, and reducing contact friction between the first support part and the first rotating plate; and
An offshore structure comprising a second friction reduction member installed on at least one of the second support and the second rotating plate, and reducing contact friction between the second support and the second rotating plate. According to paragraph 1,
A marine structure wherein the upper end of the staircase is rotatably coupled to the cantilever, and the lower end of the staircase is in rolling contact with the deck. According to paragraph 1,
The stairs,
A plurality of first insertion holes are formed at predetermined intervals in one of the first rotating plate and the first support, and at least one second insertion hole is formed in the other one of the first rotating plate and the first support,
It is inserted into the first insertion hole and the second insertion hole to fix the first rotating plate and the first support, and the angle of the first rotating plate is adjusted depending on the insertion position among the plurality of first insertion holes. A marine structure further comprising a first stopper pin. According to paragraph 1,
The staircase adjusts the height of at least one of the second support part and the second staircase according to a change in height between the cantilever and the deck when at least one of the first staircase and the second staircase rotates. A marine structure further comprising a height adjustment unit that corrects the step between the unit and the deck. According to paragraph 1,
a first driving unit that rotates the first rotating plate according to a first driving value;
a second driving unit that rotates the second rotating plate according to a second driving value;
a position detection unit that detects the position of the cantilever; and
An offshore structure further comprising a control unit that calculates the first drive value and the second drive value according to the position of the cantilever and the height profile of the deck.

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