KR101499162B1 - Method for assembling offshore structure - Google Patents

Abstract

A method of assembling an offshore structure is disclosed. A method of assembling a marine structure according to an embodiment of the present invention includes assembling a marine structure by placing a topside block on an upper part of a base block installed in the ocean so that a part of the marine structure is exposed to sea level, To at least two first carrier ships spaced apart from each other; A second step of mounting the first transportation vessel on which the topside block is mounted to the second transportation vessel; A third step in which the second transportation vessel is moved to the vicinity of the base block with the first transportation vessel on which the topside block is mounted; A fourth step of separating the first transportation vessel on which the topside block is mounted from the second transportation vessel moved to the vicinity of the base block; And a fifth step of placing the topside block mounted on the first carrier on top of the base block, wherein the first stage is such that both sides of the topside block are supported by at least two first carrier ships.

Description

[0001] METHOD FOR ASSEMBLING OFFSHORE STRUCTURE [0002]

The present invention relates to a method of assembling an offshore structure.

Recently, various types of offshore structures are being built to develop marine resources.

Floating offshore structure can be divided into SPAR type, TLP (Tension Leg Platform), Semi-submersible, FPSO (Floating, Production, Storage) and Offloading).

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a state of a spas type offshore structure. Fig.

The spa type offshore structure 10 is a structure in which a topside block 100 as a work platform is installed on a base block 200 in the form of a column having a deep draft, It is a structure.

At this time, the base block 200 can be fixed to the seabed of the deep sea through a mooring line 50 or the like, and the upper side is partially exposed above the sea surface L.

In addition, the topside block 100 is installed on the top of the base block 200 and is disposed on the sea surface L.

Such a spa-type offshore structure 10 may be assembled by mounting the topside block 100 on top of the base block 200 after the base block 200 is installed in the ocean.

At this time, in order to mount the topside block 100 on the base block 200, the topside block 100 is moved from the worksite where the topside block 100 is manufactured to the deep sea where the base block 200 is installed, (Heavy Transportation Vessel) or the like, and then lifted by a crane for rescue.

However, in many cases, the installation work of the topside block 100 is impossible according to the maritime state at the time of work, and a lot of cost and time may be wasted if waiting until the operation becomes possible.

An embodiment of the present invention is to provide a method of assembling an offshore structure in which, when assembling an offshore structure by mounting the topside block on a base block installed on the ocean, the risk of operation is reduced and time and cost can be saved.

According to an aspect of the present invention, there is provided a method of assembling a marine structure by seating a topside block on top of a base block installed in the ocean so that a part of the marine structure is exposed above sea level, A first step of mounting on at least two first carriers; A second step of mounting the first transportation vessel on which the topside block is mounted to the second transportation vessel; A third step in which the second transportation vessel is moved to the vicinity of the base block in a state in which the first transportation vessel on which the topside block is mounted is mounted; A fourth step of separating the first transportation vessel on which the topside block is mounted from the second transportation vessel moved to the vicinity of the base block; And a fifth step of placing the topside block mounted on the first carrier on top of the base block, wherein the first step includes the step of placing both sides of the topside block on the at least two first shipping vessels, A method of assembling an offshore structure is provided.

In this case, the first step may include: mounting the topside block on the second transportation vessel so that one side lower portion of the topside block manufactured in the worksite is supported by the second transportation vessel; Disposing a first shipping vessel adjacent to a second shipping vessel such that the first shipping vessel is located at both lower sides of the topside block; Lowering the second shipping vessel; And supporting both side bottoms of the topside block on the first shipping vessel.

The second step may include lowering the second carrier vessel; Positioning the second shipping vessel below a first shipping vessel on which the topside block is mounted; Raising the second shipping vessel; And a first conveyance ship on which the topside block is mounted is supported by the second conveyance ship.

The fourth step may include lowering the second transportation vessel; The first shipping vessel on which the topside block is mounted floats on the sea surface; And spacing the first shipping vessel on which the topside block is mounted from the second shipping vessel.

In addition, the fifth step may include: moving the first shipping vessel on which the topside block is mounted to position the topside block on top of the base block; Lowering the first shipping vessel on which the topside block is mounted; And a step in which the topside block is seated on top of the base block.

On the other hand, the first conveying vessel and the second conveying vessel can be raised and lowered by adjusting the ballast.

According to one embodiment of the present invention, the first conveyance vessel equipped with the topside block through the ballast control of the ship can be easily mounted or separated on the second conveyance ship.

In addition, according to the embodiment of the present invention, the first conveying vessel on which the topside block is mounted is moved to the top side block installation place while being mounted on the second conveyance ship, It is possible to save the cost and time required for the installation work of the apparatus and reduce the risk of the work.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a state of a spas type offshore structure. Fig.
2 to 5 are views showing a first step of a method of assembling an offshore structure according to an embodiment of the present invention.
6 is a view showing another embodiment of a first step of a method of assembling an offshore structure according to an embodiment of the present invention.
7 to 9 are views showing a second step of a method of assembling an offshore structure according to an embodiment of the present invention.
10 is a view illustrating a fourth step of a method of assembling an offshore structure according to an embodiment of the present invention.
11 to 12 are views showing a fifth step of a method of assembling an offshore structure according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

2 to 5 are views showing a first step of a method of assembling an offshore structure according to an embodiment of the present invention.

6 is a view showing another embodiment of a first step of a method of assembling an offshore structure according to an embodiment of the present invention.

7 to 9 are views showing a second step of a method of assembling an offshore structure according to an embodiment of the present invention.

10 is a view illustrating a fourth step of a method of assembling an offshore structure according to an embodiment of the present invention.

11 to 12 are views showing a fifth step of a method of assembling an offshore structure according to an embodiment of the present invention.

A method for assembling an offshore structure according to an embodiment of the present invention is a method for assembling a deep-sea offshore structure in which a topside block 100 is installed on a base block 200.

More specifically, it is a method of assembling the marine structure by placing the topside block 100 on top of the base block 200 installed in the ocean so that a part of the marine structure is exposed above sea level.

At this time, the offshore structure may be a spa type offshore structure.

The method of assembling an offshore structure according to an embodiment of the present invention may include the following five steps.

The first step is a process of mounting the topside block 100 manufactured in the worksite 5 on the first transportation vessel 110.

The second step is to mount the first transportation vessel 110 on which the topside block 100 is mounted on the second transportation vessel 120.

The third step is a process of moving the second conveying vessel 120 to the vicinity of the base block 200 with the first conveying vessel 110 on which the topside block 100 is mounted.

The fourth step is a process of separating the first transportation vessel 110 on which the topside block 100 is mounted from the second transportation vessel 120.

The fifth step is a process of placing the topside block 100 mounted on the first transportation vessel 110 on the top of the base block 200.

Through the process including five steps in total, the topside block 100 manufactured in the worksite 5 is seated on the base block 200 installed in the ocean, so that the offshore structure can be assembled.

Hereinafter, the above-described five steps for assembling an offshore structure will be described in detail with reference to the drawings.

The first stage is a process of mounting the topside block 100 manufactured in the worksite 5 on the first transportation vessel 110 and is a process of installing the topside block 100 of the worksite 5, The first conveying vessel 110 and the second conveying vessel 120 such that the block 100 is mounted on the second conveying vessel 120 and then moved to the first conveying vessel 110 .

Before describing the first step, the first conveying vessel 110 and the second conveying vessel 120 will be described first for convenience of explanation.

According to one embodiment of the present invention, the first transportation vessel 110 may be a barge.

At this time, the first conveying vessel 110 may be at least two, for example, a pair of barges.

In the description of the embodiment of the present invention, for convenience of explanation, only the case where the first conveying vessel 110 is composed of two is described as an embodiment. However, But the present invention is not limited thereto, and it may be constituted by one, or three or more units.

Here, the barge line is meant to include all vessels that are formed in a flat shape and can carry heavy objects such as cargoes and can be transported, and includes both self-powered devices and those that are moved by a tug boat without self-powered devices .

Meanwhile, according to an embodiment of the present invention, the second transportation vessel 120 may be an HTV (Heavy Transportation Vessel).

Here, HTV means all vessels constructed to carry large cargoes that can not be transported by general cargo ship due to limitations on weight, shape and size of cargo.

In this case, according to an embodiment of the present invention, the second conveying vessel 120 may be formed on a scale capable of mounting both the topside block 100 and the pair of first conveying vessels 110.

Meanwhile, according to an embodiment of the present invention, the above-described first conveyance ship 110 and the second conveyance ship 120 can rise and fall in floating state on the sea surface by adjusting the ballast.

In this case, according to an embodiment of the present invention, the first conveying vessel 110 and the second conveying vessel 120 may have ballast tanks, and by injecting and discharging seawater into the ballast tanks, have.

As shown in FIG. 2, the topside block 100 manufactured in the worksite 5 is mounted on the second transportation vessel 120.

Here, the work place 5 includes all of the work places on the land where the top side block 100 is dried, and does not refer to a specific place such as a dock.

At this time, according to an embodiment of the present invention, the topside block 100 may be dried by a land drying method in the vicinity of an inner wall to facilitate the movement to the sea.

In this case, according to an embodiment of the present invention, the topside block 100 is connected to the second conveying vessel 120 (for example, a ship) waiting on the seam by using the rail apparatus 20, for example, a skid rail, ). ≪ / RTI >

At this time, the topside block 100 may be a very large structure that can not be mounted and transported by a general cargo ship, and thus, as described above, the second transportation vessel 120 may be an HTV.

At this time, according to an embodiment of the present invention, one side lower part of the top side block 100 may be mounted to be supported by the second transportation vessel 120.

For example, referring to FIG. 3, the topside block 100 is connected to the second transportation vessel 120 such that the longitudinal direction of the topside block 100 and the longitudinal direction of the second transportation vessel 120 are perpendicular to each other, As shown in FIG.

In this case, the lower side of the center of the top side block 100 is supported by the second conveyance ship 120, and the lower side of both sides of the top side block 100 is separated from the second conveyance ship 120, As shown in FIG.

3, after the topside block 100 is mounted on the second transportation vessel 120 so that one side of the topside block 100 is supported by the second transportation vessel 120, The first conveying vessel 110 is disposed adjacent to the second conveying vessel 120 such that the first conveying vessel 110 is positioned below the other side of the topside block 100.

3, the first conveying ship 110 has two units, and the second conveying ship 120 is separated from the second conveying ship 120 by a top side block (not shown) projecting in the left- The first conveying vessel 110 may be disposed on the lower side of both sides of the first conveying vessel 100.

Next, referring to FIG. 4, the second conveying vessel 120 on which the topside block 100 is mounted is lowered.

As described above, the second conveying vessel 120 can be raised and lowered by regulating the ballast, so that the second conveying vessel 120 can descend in a floating state in the sea.

At this time, the top side block 100 mounted on the second conveyance ship 120 is lowered together. As the top side block 100 descends, the top side block 100 moves to the second shipping vessel 120 Is naturally supported by the first conveying vessel 110 disposed at the lower portion of the portion.

Accordingly, referring to FIG. 4, as the second conveying vessel 120 descends, the topside block 100 is supported by the first conveying vessel 110.

In other words, the top side block 100 mounted on the second conveyance ship 120 can be moved and mounted on the pair of first conveyance ships 110.

At this time, according to an embodiment of the present invention, the first conveyance ship 110 may be provided with a support member 30 for supporting the topside block 100, for example, The side block 100 may be supported by a supporting member 30 provided on the first conveying vessel 110.

5, after the topside block 100 is mounted on the first conveying vessel 110, the lowered second conveying vessel 120 is separated from the first conveying vessel 110. As shown in FIG.

At this time, by moving at least one of the first conveying vessel 110 and the second conveying vessel 120, the second conveying vessel 120 can be separated from the first conveying vessel 110.

Through the above-described process, the first step of mounting the topside block 100 manufactured in the worksite 5 on the first transportation vessel 110 is completed.

Meanwhile, in the method of assembling an offshore structure according to an embodiment of the present invention, the first step may be performed through another process.

According to an embodiment of the present invention, the topside block 100 manufactured in the worksite 5 can be directly mounted on the first transportation vessel 110 without passing through the second transportation vessel 120.

6, the topside block 100 is mounted on the two first cargo ships 110 using the rail device 20, while the topside block 100 is a very large structure, can do.

In this case, since the process of mounting the topside block 100 on the second transportation vessel 120 and then moving it to the first transportation vessel 110 can be omitted, time and cost can be saved.

After the first step of mounting the topside block 100 on the first conveyance ship 110 is completed, the first conveyance ship 110 on which the topside block 100 is mounted is mounted on the second conveyance ship 120 A second step is performed.

In the second step, the second conveying vessel 120 is lowered to be disposed below the first conveying vessel 110, and then the second conveying vessel 120 is elevated, 1 < / RTI > carrier vessel 110 to the second conveying vessel 120. In this step,

In more detail, according to an embodiment of the present invention, as shown in FIG. 7, when the second conveying vessel 120 is lowered and the two first conveying vessels 110 on which the topside block 100 is mounted And the second transportation vessel 120 is disposed at the lower portion.

At this time, the second transportation vessel 120 is disposed so that the two first transportation vessels 110 on which the topside block 100 is mounted can be stably mounted on the second transportation vessel 120.

Next, referring to FIG. 8, the second conveying vessel 120 is raised.

At this time, as the second conveying vessel 120 is raised, the two first conveying vessels 110 on which the topside block 100 is mounted can be naturally supported on the second conveying vessel 120.

Accordingly, referring to FIG. 9, the two first carrier ships 110 on which the topside block 100 is mounted can be mounted on the second carrier vessel 120.

As a result, the second conveying vessel 120 can simultaneously mount the two first conveying vessels 110 necessary for the installation of the topside block 100 and the topside block 100 at the same time.

After the second step, the second conveying vessel 120 moves to the vicinity of the base block 200 through the third step.

As shown in FIG. 9, in a state in which the two first transportation vessels 110 on which the topside block 100 is mounted, the second transportation vessel 120 is installed near the base block 200 installed in the sea Move.

Accordingly, the first conveying vessel can be moved to only the moving time and cost of the second conveying vessel 120, so that the moving time and cost of the first conveying vessel 110 can be saved.

Through the third step, the second conveying vessel 120 moved to the vicinity of the base block 200 separates the first conveying vessel 110 through the fourth step.

That is, the fourth step is to separate the first conveying vessel 110 on which the topside block 100 is mounted from the second conveyance ship 120.

In the fourth step, referring to FIG. 10, first, the second conveying vessel 120 is lowered.

At this time, as shown in FIG. 9, the second transportation vessel 120 is equipped with two first transportation vessels 110 on which the topside block 100 is mounted.

Accordingly, as the second conveying vessel 120 is lowered, the two first conveying vessels 110 on which the topside block 100 is mounted are gradually floated on the sea surface.

Then, the first conveying vessel 110 and the second conveying vessel 120 are separated from each other.

At this time, by moving at least one of the first conveying vessel 110 and the second conveying vessel 120, the first conveying vessel 110 and the second conveying vessel 120 can be separated from each other.

After the fourth step is completed, the fifth step of placing the topside block 100 mounted on the first transportation vessel 110 on the top of the base block 200 is proceeded.

Referring to FIG. 11, the fifth step is to move the first conveying vessel 110 on which the topside block 100 is mounted to place the topside block 100 on the top of the base block 200.

At this time, the first conveying vessel 110 is moved so that the top side block 100 is positioned at the precise position where the top side block 100 is to be seated, that is, the top side block 100 is positioned at the accurate seating position on the base block 200.

Next, referring to FIG. 12, the two first carrier ships 110 on which the topside block 100 is mounted are lowered.

At this time, as the two first carrier ships 110 are lowered, the top side block 100 mounted on the first carrier vessel 110 is also lowered. As a result, (200).

Then, an operation of coupling the topside block 100 seated on the top of the base block 200 to the base block 200 may be performed.

As described above, the method for assembling an offshore structure according to an embodiment of the present invention includes the steps of: mounting a topside block 100 on a first conveyance ship 100, which is mounted on a first conveyance ship 110 and a second conveyance ship 120, The ship 110 can be easily mounted on or separated from the second transportation vessel 120.

According to an embodiment of the present invention, since the first conveying vessel 110 is mounted on the second conveying vessel 120 and moves to the installation site, the time required for the movement of the first conveying vessel 120 And cost savings.

At this time, by mounting the first conveying vessel 110 in a state where the topside block 100 is mounted on the second conveyance vessel 120, the topside block 100 is installed for installation of the topside block 100 It is possible to omit the process of mounting the topside block 100 on the first transportation vessel 110, so that the cost and time required for installing the topside block 100 can be saved, and the risk of work can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

5 Workshop 10 Offshore Structures
20 rail 30 support member
50 Mooring line 100 Top side block
110 First Carrier 120 Second Carrier
200 Base Block L Sea Level

Claims (6)

CLAIMS 1. A method for assembling an offshore structure by seating a topside block on top of a base block installed in the ocean so that a portion is exposed above sea level,
A first step of mounting the topside blocks manufactured in a worksite on at least two first carrier ships spaced apart from each other;
A second step of mounting the first transportation vessel on which the topside block is mounted to the second transportation vessel;
A third step in which the second transportation vessel is moved to the vicinity of the base block in a state in which the first transportation vessel on which the topside block is mounted is mounted;
A fourth step of separating the first transportation vessel on which the topside block is mounted from the second transportation vessel moved to the vicinity of the base block; And
And a fifth step of placing the top side block mounted on the first transportation vessel on top of the base block,
Wherein the first step is such that both sides of the topside block are supported by the at least two first shipping vessels. The method according to claim 1,
In the first step,
Mounting the topside block on the second transportation vessel so that one side lower portion of the topside block manufactured in the worksite is supported by the second transportation vessel;
Disposing a first shipping vessel adjacent to a second shipping vessel such that the first shipping vessel is located at both lower sides of the topside block;
Lowering the second shipping vessel; And
Wherein both lower sides of the topside block are supported on the first shipping vessel. The method according to claim 1,
The second step comprises:
Lowering the second shipping vessel;
Positioning the second shipping vessel below a first shipping vessel on which the topside block is mounted;
Raising the second shipping vessel; And
Wherein the first shipping vessel on which the topside block is mounted is supported on the second shipping vessel. The method according to claim 1,
In the fourth step,
Lowering the second shipping vessel;
The first shipping vessel on which the topside block is mounted floats on the sea surface; And
And spacing the first shipping vessel on which the topside block is mounted from the second shipping vessel. The method according to claim 1,
In the fifth step,
Moving the first shipping vessel on which the topside block is mounted to place the topside block on top of the base block;
Lowering the first shipping vessel on which the topside block is mounted; And
Wherein the topside block is seated on top of the base block. 6. The method according to any one of claims 1 to 5,
Wherein the first conveying vessel and the second conveying vessel,
A method of assembling an offshore structure that can be raised and lowered by adjusting ballast.

Images