KR20160061783A - Apparatus for installing offshore structures and Method for installing offshore structures - Google Patents

Abstract

An apparatus and a method for coupling an offshore structure are provided. The apparatus for coupling an offshore structure comprises: a rail part which is installed on a foundation part formed on a seabed in one direction; one or more tower parts which slide along the rail part and are extended upward from the rail part; and vertical moving parts which slide along the tower parts and support an upper structure located on the sea to allow the upper structure to ascend and descend. Therefore, the present invention precisely couples an upper structure and a lower structure of an offshore structure to each other and launches the offshore structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining apparatus for a marine structure and a joining method of a marine structure which are capable of easily coupling an upper structure and a lower structure of a marine structure at sea and then launching the marine structure quickly.

Large structures such as large ships, marine drilling facilities or offshore structures are difficult to dry together and are divided into several blocks and assembled. Among them, the marine structure is divided into the upper structure and the lower structure. Then, the marine structure is combined into one marine structure on the land. Generally, when the upper structure is lifted by the crane, the lower structure is moved to the lower end of the upper structure, and the upper and lower structures are combined to complete a single structure.

However, it is not easy to control the direction of the lower structure in the coupling of the upper / lower structure on the land, and there is also a problem that the method of moving to the sea after the upper and lower structures are combined is not easy.

Therefore, in order to solve the problem of the coupling of marine structure on the land, there is actively developed and designed a method of combining the dried upper / lower structure at sea and launching it immediately. For example, Korean Patent Laid-Open No. 10-2010-0001242 discloses a system and method for continuously constructing floating structures in sea. However, such a coupling method is highly restricted by the sea depth and is greatly affected by the environmental load. Therefore, there is a problem that the upper structure and the lower structure can not be precisely coupled at sea.

Korean Patent Publication No. 10-2010-0001242, (2010.01.06)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a coupling device for a marine structure for precisely coupling an upper structure and a lower structure of a marine structure at sea. Another object of the present invention is to provide a method of joining a marine structure that precisely joins an upper structure and a lower structure of a marine structure at sea and launches the marine structure.

The technical problem of the present invention is not limited to the above-mentioned problems, and another technical problem which is not mentioned can be clearly understood by those skilled in the art from the following description.

The present invention provides an apparatus for joining a marine structure, comprising: a rail part installed on a base part formed on a sea floor in one direction; at least one tower part slidably moving along the rail part and extending upward from the rail part; And a vertical moving part for moving up and down the upper structure located in the sea.

And an interval adjusting unit for adjusting the interval between the plurality of tower units when the tower unit is plural.

One end of the cylinder may be connected to one of the tower portions and the other end of the cylinder may be connected to the other of the tower portions so that the cylinder is extendable parallel to the rail portion.

Wherein the vertical movement part includes a first support plate, a second support plate spaced apart from the first support plate, and at least one hydraulic jack interposed between the first support plate and the second support plate, And can be expanded or contracted corresponding to the pressure applied to the second support plate.

The tower portion may include a support portion that is slidably coupled to the rail portion in a horizontal direction, and a drive roller that is formed on the support portion and is in rolling contact with the rail portion.

A method of joining a marine structure according to the present invention includes the steps of (A) entering an upper structure into a space between a plurality of tower portions provided so as to be horizontally movable on a sea, a vertical moving portion vertically moving along the tower portion (C) in which at least one of the lower structure and the tower portion horizontally moves in the sea so that the upper structure and the lower structure are coupled to each other so that the lower structure and the upper structure located on the sea surface overlap each other, .

In the step (A), the tower part is slidably connected to a rail part provided horizontally on the sea floor, and the upper structure may enter the tower part in parallel with the rail part.

In the step (A), the horizontal interval between the tower units may be adjusted corresponding to the size of the upper structure.

Wherein the vertical moving part of the step (B) comprises a first supporting plate supporting the upper structure, a second supporting plate positioned below the first supporting plate, and a plurality of hydraulic pressure chambers interposed between the first supporting plate and the second supporting plate The hydraulic jack, including the jack, may be stretched or contracted independently, corresponding to the pressure of the superstructure.

In the step (C), the lower structure may move horizontally along the sea surface toward the raised upper structure, and the lower structure may overlap the lower structure.

The upper structure and the lower structure of the marine structure can be precisely coupled at sea and can be launched quickly by the coupling device of the marine structure according to the present invention.

In addition, with the method of joining the marine structure according to the present invention, the influence of the environmental load applied at the sea is minimized, so that the upper structure and the lower structure of the marine structure are precisely combined and then can be launched rapidly.

1 is a perspective view of a coupling device for a marine structure according to a first embodiment of the present invention.
2 is a front view of a coupling device of the marine structure of FIG.
3 is an operation diagram of a vertical moving unit connected to the tower unit and slidingly moved.
4 is an operation diagram of a tower portion slidingly moved in association with the operation of the interval adjusting portion.
5 is an operational view of a vertical moving part in which the slope of the first supporting plate varies in response to the operation of the hydraulic jack.
6 to 8 are views sequentially showing a method of joining marine structures according to the first embodiment of the present invention.
9 to 11 are views sequentially showing a method of joining marine structures according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is only defined by the claims. Like reference numerals refer to like elements throughout the specification.

First, referring to Figs. 1 to 5, a description will be made of a coupling device for a marine structure according to a first embodiment of the present invention.

FIG. 1 is a perspective view of a coupling device of a marine structure according to a first embodiment of the present invention, and FIG. 2 is a front view of a coupling device of the marine structure of FIG.

First, in the specification of the present invention, a marine structure refers to a structure in which an upper structure having a deck at the upper part and a lower structure supporting the upper structure are coupled to a lower structure to support the upper structure to explore or collect energy resources at sea or seabed .

The coupling device 1 of the marine structure according to the first embodiment of the present invention allows the upper structure TH and the lower structure BH to be precisely coupled at sea and then be launched rapidly. The joining device 1 of the marine structure includes a rail part 10 installed in one direction on a foundation part B artificially formed on a part of the sea floor, a rail part 10 slidably connected to the rail part 10, 10 and at least one tower portion 20 extending upwardly of the firebox 10 slides along the tower portion 20 and moves up and down with the upper structure fire TH located in the sea, And a space adjusting unit 40 interposed between the tower unit 20 and adjusting the horizontal interval between the tower units 20 or keeping the horizontal interval constant, .

Hereinafter, the constituent elements of the coupling device 1 of the marine structure will be described in more detail.

The base portion (B) is a floor flattened on one side. Particularly, the base portion (B) is firmly formed through stone, cement, concrete, etc. in order to prevent settlement by heavy objects and to prevent erosion due to storm surges and currents. Thus, the rail portion 10, the tower portion 20, and the like can be firmly installed on the base portion B.

At least one of the rail parts 10 is provided in the base part B in the horizontal direction and a pair of the parallel parts of the rail part 10 may be arranged side by side on the base part B as shown in Fig. At this time, the rail portion 10 is installed more firmly in the base portion B through a connection method such as bolt welding. For example, the rail part 10 is fastened to the tower part 20 through a structure such as a projection or a step formed along the longitudinal direction, and can guide the sliding movement of the tower part 20. [ The shape of the rail part 10 may be variously changed corresponding to the height, weight, connection structure, etc. of the tower part 20.

The tower portion 20 is connected in a frame shape and elongated in a vertical direction. That is, the tower portion 20 is a structure that is raised at a constant height, and a plurality of the tower portions 20 may be spaced apart from each other and arranged side by side. The tower portion 20 lifts the upper structure (see TH in FIG. 1 and FIG. 2) at a constant height by using the vertical moving portion 30 and stably supports the lifted upper structure TH.

The support portion 21, the guide rail 23 and the vertical movement portion 30 can be installed on the tower portion 20 and the gap adjusting portion 40 is interposed between the tower portions 20. The support portion 21 is positioned at the lower end of the tower portion 20 and is engaged with the rail portion 10 to transmit the load of the tower portion 20 to the rail portion 10. [

The support portion 21 may include a groove having a cross section in a shape corresponding to the shape of the rail portion 10 and may be combined with the projections, the stepped structure, or the like of the rail portion 10 described above. The support portion 21 is provided with a plurality of drive rollers 22 for rolling contact with the rail portion 10 to facilitate sliding movement and a brake portion for restricting sliding movement, Sliding.

Accordingly, not only the tower portion 20 is stably fastened to the rail portion 10, but also movement and movement restriction on the rail portion 10 can be smoothly performed.

The guide rail 23 may be formed parallel to the vertical direction along the longitudinal direction of the tower portion 20. For example, at least one of the guide rails 23 may be formed parallel to the left / right side of the tower portion 20 .

The vertical moving part 30 includes a rail connecting part 35 fastened to the guide rail 23 formed parallel to the tower part 20 and moves up and down smoothly along the tower part 20.

The vertically moving part 30 includes a first support plate 31, a second support plate 32 positioned below the first support plate 31, a second support plate 32 disposed between the first support plate 31 and the second support plate 32, And may include a plurality of hydraulic jacks 33 for adjusting the distance between the first and second support plates 31 and 32 (see FIG. 5).

The first support plate 31 and the second support plate 32 are plate members formed in a flat plane capable of easily distributing the load pressure. The first support plate 31 transfers the load pressure to the tower unit 20 and the second support plate 32 is separated from the first support plate 31 with the hydraulic jack 33 interposed therebetween, .

The hydraulic jack 33 is a mechanism that is stretched and contracted in the vertical direction by the pressure transmitted from the first support plate 31 and is formed by a hydraulic device such as a jack device or the like so as to be positioned between the first support plate 31 and the second support plate 32 A plurality of units can be installed and operated independently.

The lower end of the hydraulic jack 33 is firmly fixed to the second support plate 32 through a connection method such as bolt and welding and the upper end is connected to a ball joint 34 (see FIG. 5) And may be connected to the first support plate 31.

The hydraulic jack 33 is rigidly connected to the second support plate 32 and is individually expanded and contracted so that the inclination of the first support plate 31 can be inclined in the roll direction and the pitch direction or the like . As a result, when the upper structure TH and the lower structure BH are brought into contact with each other, such as when the upper structure (see TH in FIG. 1) is lowered and joined to the lower structure (see FIG. 1 BH) You can adjust the position and tilt.

The interval adjusting portion 40 may be a cylinder interposed between the intervals of the tower portion 20. [ More specifically, the gap adjusting unit 40 may include a case 41 as shown in FIG. 2 and an operating rod 42 that slides inside the case.

The operating rod 42 reciprocates within the hollow case 41 by hydraulic pressure, and its length can be elongated or contracted. One end of the gap adjusting portion 40, that is, the case 41 is connected to and fixed to one of the tower portions 20, and the other end, that is, the operating rod 42 is connected to the other tower portion 20 Can be fixed.

The length of the gap adjusting portion 40 connected to the tower portion 20 is extended and contracted in accordance with the reciprocating movement of the operation rod 42. Thus, the tower portion 20 is horizontally moved on the rail portion 10 The spacing is adjusted. Conversely, if the operating rod 42 does not reciprocate and maintains a constant length, the tower portion 20 can maintain a plurality of horizontal intervals on the rail portion 10. That is, the horizontal distance between the tower portions 20 can be adjusted or kept constant depending on whether or not the operation rod 42 reciprocates.

Particularly, the horizontal interval of the tower section 20 is appropriately adjusted according to the size of the upper structure TH, and when the horizontal interval between the tower sections 20 is properly adjusted, Is positioned at a position where the upper structure (TH) can be smoothly lifted. The vertical moving part 20 lifts the upper structure TH smoothly and transfers the load pressure transmitted to the upper structure TH to the tower part 20 to be dispersed. Accordingly, the tower portion 20 can stably support the upper structure TH.

3 is an operation diagram of a vertical moving unit connected to the tower unit and slidingly moved.

FIG. 3 (a) is a view of the vertical movement section positioned at the lower end of the tower section, and FIG. 3 (b) is a view showing the vertical movement section positioned at the upper end of the tower section.

3 (a) and 3 (b), the vertical moving unit 30 is installed in each of the plurality of tower units 20 as shown in FIG. At least a part of the vertical moving part 30 may be connected to a strand jack (not shown) or a mechanical lifting device provided on the tower part 20 and ascend and descend. A rail connecting portion (see 35 in FIG. 5) including a groove or a recessed structure is formed on one side of the vertical moving portion 30 and connected to a guide rail 23 formed on one side of the tower portion 30 . The vertical moving part 30 is coupled to the guide rail 23 to smoothly move one side of the tower part 20 in the vertical direction.

The vertical moving part 30 is quickly raised to a predetermined height at which the upper structure TH is located, for example, through a lifting device or the like. After the upper structure TH is supported, the vertical moving part 30 is slowly raised . That is, the vertical moving part 30 is moved quickly when there is no load transmitted to the vertical moving part 30, and can be moved slowly when there is a transmitted load.

Accordingly, the vertical moving part 30 can be quickly moved to the position where the upper structure TH is located, thereby shortening the time required to lift the upper structure TH. Therefore, the vertical moving unit 30 can secure both stability and speed of operation.

However, it is not necessary to limit the movement of the vertical moving part 30, and the driving force is transmitted in various various ways that can smoothly move up and down along the tower part 20 to move the vertical moving part 30 .

4 is an operation diagram of a tower portion slidingly moved in association with the operation of the interval adjusting portion.

FIG. 4A is a state view showing a state before the horizontal interval between the tower units is adjusted, and FIG. 4B is a state diagram showing a state in which the horizontal interval between the tower units is adjusted by the operation of the interval adjusting unit.

At least one space may be interposed between the plurality of tower portions 20 as shown in FIG. At this time, the interval adjusting section 40 is constituted by a cylinder which can be expanded and contracted as described above. The cylinder is connected to one of the tower sections 20 at one end in parallel with the rail section 10, And may be connected to the tower unit 20.

When the gap adjusting unit 40 connected to the tower unit 20 is simultaneously expanded and contracted in the same direction, the tower unit 20 is slidably moved. For example, when all of the operation rods 42 are slidingly moved to the inside of the case 41 and the length thereof is reduced, the horizontal interval of the tower portion 20 becomes the shortest. Conversely, The horizontal distance of the tower unit 20 becomes the longest.

The tower portion 20 is moved along the rail portion 10 in a fine and precise manner in correspondence to the length in which the operation rod 42 is stretched and contracted so that the horizontal portion of the tower portion 20 The spacing can be adjusted.

5 is an operational view of a vertical moving part in which the slope of the first supporting plate varies in response to the operation of the hydraulic jack.

5 (a) is an operation diagram in which the first supporting plate moves in the pitch direction by the operation of the hydraulic jack, and FIG. 5 (b) ) Direction. Here, the pitch direction and the roll direction may refer to different vibration directions in which the first support plates oscillate with respect to an oscillation axis perpendicular to each other. FIG. 5 is shown in a slightly exaggerated state to make the description more effective.

Referring to Figs. 5 (a) and 5 (b), the hydraulic jack 33 operates independently in expansion and contraction. The hydraulic jack 33 is configured to finely adjust the height of the upper structure TH when the upper structure (see TH in FIG. 1) is engaged with the lower structure (see BH in FIG. 1) To ensure accurate coupling.

The ball joint 34 is connected to the upper end of the hydraulic jack 33 so that the first foot plate 31 connected to the ball joint 34 can freely move in a roll direction and a pitch direction . Therefore, the hydraulic jack 33 can control the height of the upper structure TH in a three-dimensional manner, so that the upper structure TH can be accurately seated in the lower structure BH.

Particularly, even if the lower structure BH floating in the sea is partially inclined according to the state of the sea surface, the hydraulic jack 33 is extended and contracted to adjust the height of the upper structure TH three-dimensionally and fine- It is possible.

Hereinafter, with reference to FIGS. 6 to 8, a method of joining a marine structure according to a first embodiment of the present invention will be described in detail.

The method of joining the marine structure according to the first embodiment of the present invention is performed using the joining device 1 of the marine structure described above. Therefore, the description of each component mentioned below is replaced with a description of the components of the coupling device 1 of the above-described marine structure, unless otherwise stated.

6 to 8 are views sequentially showing a method of joining marine structures according to the first embodiment of the present invention.

A method of joining a marine structure according to a first embodiment of the present invention relates to a method of precisely combining an upper structure and a lower structure of a marine structure at sea. The method of joining the marine structure includes a step of entering the upper structure TH into a plurality of tower portions 20 installed to be movable horizontally on the sea, a vertical moving portion 30 moving up and down along the tower portion 30, At least one of the lower structure BH and the tower portion 30 is moved in the sea direction so that the lower structure BH and the upper structure TH located on the sea surface are overlapped with each other, And horizontally moving the upper structure TH and the lower structure BH together.

Hereinafter, each step of the method of joining the marine structures will be described in more detail with reference to the respective drawings.

6, a plurality of tower portions 20 are disposed horizontally on a rail portion 10 provided horizontally on a base portion B, and a plurality of tower portions 20 are provided on the base portion B, And is connected to the gap adjusting unit 40. The upper structure TH may be formed in parallel with the rail portion 10 between the rail portions 10 so as to be spaced apart from the tower portion 20). ≪ / RTI > At this time, the tower part 20 is fixed to a specific position of the rail part 10 through the break part formed on the support part 21, and the vertical movement part 30 is also fixed to the specific part of the tower part 20 And can be fixed while being raised to a height.

The upper structure TH can be inserted between the tower portions 20 by being loaded on the barge S as shown in FIG. When the barge S enters the upper structure TH through the tower portions 20, the plurality of tower portions 20 are slid to correspond to the size of the upper structure TH using the gap adjusting portion 40 , The horizontal spacing between them is adjusted.

Therefore, the tower portion 20 is positioned at a position suitable for lifting the upper structure TH from the vertical moving portion 30. [

Thereafter, the vertical moving part 30 ascending and descending in the vertical direction along the tower part 20 lifts up the upper structure TH, thereby raising the upper structure TH along the tower part 20 Complete. At this time, the vertical moving part 30 is provided with a plurality of hydraulic jacks (see 33 in FIG. 5) interposed between the first and second support plates (see 31 in FIG. 5) The pressure of the upper structure TH can be effectively expanded and contracted and the upper structure TH can be smoothly supported and raised while the first plate 31 is aligned in three dimensions corresponding to the upper structure TH.

After the upper structure TH is lifted up to the upper end of the tower portion 20, the lower structure BH located on the sea surface moves horizontally along the sea surface as shown in Fig. 7 (a) The lower structure BH is superimposed on the lower side of the upper structure TH as shown in Fig. Thereafter, as shown in FIG. 7 (b), the vertically moving part 30 is lowered at the overlapped position, so that the upper structure TH and the lower structure BH can be precisely combined. At this time, the vertical movement unit 30 also adjusts the upper structure TH so as not to be tilted to one side by using the first and second support plates 31 and 32 and the hydraulic jack 33, , The upper structure TH can be seated while adjusting the equilibrium state of the upper structure TH. Whereby the upper structure TH can be precisely coupled to the proper position of the lower structure BH.

Through this method, the upper structure (TH) is coupled with the lower structure (BH), and the coupling step of the upper / lower structure is completed. Thus, the upper structure TH and the lower structure BH, which have entered the coupling device 1 of the marine structure and have been coupled to each other, are completed with one marine structure as shown in FIG. 8, and can be launched into the marine structure.

Hereinafter, with reference to Figs. 9 to 11, a method of joining a marine structure according to a second embodiment of the present invention will be described in detail.

9 to 11 are views sequentially showing a method of joining marine structures according to a second embodiment of the present invention.

In the method of joining a marine structure according to the second embodiment of the present invention, the tower portion 20 slides horizontally along the rail portion 10 to a position where the lower structure BH is located. That is, unlike the first embodiment, the tower portion 20 moves in the horizontal direction toward the lower structure BH located at the sea surface, so that the raised upper structure TH can be superimposed on the upper portion of the lower structure BH have.

9 to 11, in a method of joining a marine structure according to a second embodiment of the present invention, a tower portion 20 for supporting and lifting an upper structure TH is installed on a lower structure BH, To bind the upper structure TH to the lower structure BH. According to the second embodiment of the present invention, the lower structure BH is ballasted before the upper structure TH and the lower structure BH are overlapped with each other to seat the bottom of the lower structure BH on the sea floor Can be preceded. Through this, the upper structure (TH) can be moved and joined together while the lower structure (BH) is stably supported.

The lower structure BH may move adjacent to the coupling device 1 of the sea structure as shown in Fig. 9 (a) and be seated on the seabed as shown in Fig. 9 (b). The step in which the lower structure BH is seated can proceed at any time before the upper structure TH moves toward the lower structure BH and overlaps it.

The bottom structure BH located on the sea surface may enter the top of the base portion B formed by flattening the bottom of the sea floor and then be ballasted so that the bottom portion of the bottom structure BH can be seated on the base portion B. Therefore, the lower structure BH is firmly fixed to the base portion B, and can maintain a stable state that is not easily moved by the marine climate.

Referring to FIG. 10, the tower portion 20 on which the upper structure TH is mounted moves to a position where the lower structure BH is located while maintaining a constant horizontal distance between the tower portions 20. [ Thus, the lower structure BH is accurately positioned at a position where the lower surface portion of the upper structure TH is to be connected, and the upper structure TH is seated at the correct position of the lower structure BH through the vertical moving portion 30 .

That is, the interval between the tower portions 20 can be adjusted as necessary by using the above-described interval adjusting portion 40 which is interposed between the tower portions 20 in a stretchable manner so as to adjust or keep the horizontal spacing The upper structure TH is moved to the upper portion of the lower structure BH while maintaining the interval between the tower portions 20 constant after the upper structure TH is supported and raised, So that it can stably overlap.

Thereafter, the upper structure TH is precisely engaged with the lower structure BH through fine adjustment of the vertical moving part 30 as described above. When the upper structure TH and the lower structure BH are coupled to each other, the tower portion 20 returns quickly as shown in FIG. 11, and the upper structure TH and the lower structure BH are combined into a single structure It is ballasted, rising to the sea surface, and then launched quickly.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: marine structure coupling device 10:
20: Tower part 21: Support part
22: drive roller 23: guide rail
30: vertical moving part 31: first supporting plate
32: second base plate 33: hydraulic jack
34: Ball joint 35: Rail connection
40: gap adjusting portion 41: case
42: operating rod B: base part
TH: superstructure BH: substructure
S: Barge

Claims (10)

A rail part installed in one direction on a base part formed on the sea floor;
At least one tower portion slidably moving along the rail portion and extending upwardly from the rail portion; And
And a vertically moving part that slides along the tower part and moves up and down the upper structure located in the sea. The apparatus according to claim 1,
And an interval adjusting unit for adjusting an interval between the plurality of tower units. 3. The air conditioner according to claim 2, wherein the interval adjusting portion includes a cylinder capable of expanding, and the cylinder is connected to one of the tower portions so that the cylinder is parallel to the rail portion and the other end portion is connected to the other tower portion A coupling device for a marine structure. [2] The apparatus of claim 1,
At least one hydraulic jack interposed between the first and second support plates, wherein the first and second support plates are spaced apart from the first support plate,
And the hydraulic jack is capable of being stretched and contracted in response to a pressure applied to the first and second support plates. The apparatus as claimed in claim 1, wherein the tower portion includes a support portion slidably coupled to the rail portion in a horizontal direction, and a drive roller formed in the support portion and in rolling contact with the rail portion. (A) entering an upper structure through a plurality of tower portions provided so as to be movable in a horizontal direction on the sea;
(B) supporting the upper structure and raising the vertically moving part moving up and down along the tower part; And
Wherein at least one of the lower structure and the tower is horizontally moved in a horizontal direction so that the upper structure and the lower structure overlap with each other so that the upper structure and the lower structure overlap with each other, . [7] The method as claimed in claim 6, wherein the tower portion of the step (A) is slidably connected to a rail portion horizontally provided on the sea floor, and the upper structure includes: Bonding method. [7] The method of claim 6, wherein the tower portion of the step (A) is adjusted in horizontal spacing to correspond to the size of the upper structure. [7] The method of claim 6, wherein the vertical movement unit comprises a first support plate supporting the upper structure, a second support plate positioned below the first support plate, and a second support plate disposed between the first support plate and the second support plate, Wherein the hydraulic jack is independently stretched or retracted in response to a pressure of the upper structure, the hydraulic jack including a plurality of hydraulic jacks interposed in the upper structure. [7] The method of claim 6, wherein the step (c) comprises: moving the lower structure horizontally along the sea surface toward the raised upper structure so that the lower structure overlaps the lower structure.

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