KR102239547B1 - Method for ballasting offshore floating body for wind power generation - Google Patents

Abstract

Provided is a ballasting method of an offshore wind power generation floating body. According to embodiments of the present invention, a solid ballast can be easily filled inside a floating body without installation of an additional transfer pipe to the inside of the floating body in an offshore environment where waves and wind are strong.

Description

Ballasting method of floating body for offshore wind power generation {METHOD FOR BALLASTING OFFSHORE FLOATING BODY FOR WIND POWER GENERATION}

Embodiments of the present invention relate to the ballasting technology of an offshore wind turbine floating body.

In general, wind power converts wind energy into mechanical energy using a device such as a wind turbine, and uses this energy to generate electricity by turning a generator. At this time, wind power generation is divided into onshore type wind power generation and offshore type wind power generation according to the installation location. Recently, among offshore wind power generation, the lower floating body is not fixed to the sea floor but is floating on the sea floor. R&D on floating offshore wind power is actively underway.

Such an offshore wind power generation float needs to have its center of gravity lower than the center of buoyancy for the stability of the float, and accordingly, water or solid ballast is filled inside the float. However, in the case of a general long cylindrical SPAR type float, it is not easy to fill the ballast from the upper side of the offshore wind power generation float while standing on the sea because the length is longer than 60 to 90 meters.

Korean Patent Application Publication No. 10-2014-0128958 (2014.11.06)

Embodiments of the present invention provide a ballasting method capable of easily filling solid ballast inside a floating body without installing a separate conveying pipe inside the floating body in an offshore environment where the working ship and the floating body are shaken by waves, wind, etc. It is to do.

According to an exemplary embodiment, a lower floating body made of a cylindrical shape with an empty inside is towed by a main working ship and transported by sea to a destination; Fixing the position of the lower floating body by the main work line and the installation line; Filling water into the lower floating body while the position of the lower floating body is fixed; A step in which a plurality of solid ballasts are lifted by a crane while the lower floating body is filled with water and sequentially loaded into the lower floating body; When the weight of the plurality of solid ballasts loaded in the lower floating body exceeds a threshold value, the plurality of solid ballasts sinking toward the base of the lower floating body; And while the solid ballast located at the bottom of the plurality of loaded solid ballasts sinks to the base side of the lower floating body, the water present inside the lower floating body is opened by opening the drain plug located at the base side of the lower floating body. There is provided a method for ballasting an offshore wind turbine floating body comprising the step of discharging to the outside of the lower floating body.

The step of fixing the position of the lower floating body includes a moving arm of a guide gripper connected to the main work line so that the monorail for fixing the lower floating body installed on the installation line can be located on both sides of the lower floating body. moving the lower floating body through a (moving arm); Fastening the monorail lifting rope connected to the lower floating body fixing monorail to the lifting holes protruding from both sides of the lower floating body; And maintaining the height of the lower floating body by a heave conpensator installed on the monorail lifting line.

The solid ballast has a latch formed on the top, and the step of sequentially loading the plurality of solid ballasts may include: fastening a main lifting rope connected to the crane to the latch; Lifting the solid ballast through the main lifting line; Loading the solid ballast into the lower floating body; And separating the main lifting shaft fastened to the catch by pulling the auxiliary lifting shaft connected to the main lifting shaft.

형상을 가질 수 있다.The catch,

It can have a shape.

In the solid ballast, a first fitting portion for fitting the ballast is formed at a lower portion, a second fitting portion having a shape corresponding to the first fitting portion is formed at an upper portion, and the solid ballast is loaded into the interior of the lower floating body. The step may be loaded by fitting the first fitting portion of the solid ballast to the second fitting portion of another solid ballast loaded on the lower end of the solid ballast.

The ballasting method of the offshore wind power generation floating body, prior to the step of sinking the plurality of solid ballasts to the base side of the lower floating body, the plurality of solid ballasts loaded in the lower floating body is the lower floating body It may further include maintaining a floating state by the buoyancy of the water filled in.

In the solid ballast, a tapered portion for opening the drain plug is formed on the lowermost side, and the step of discharging water present in the lower floating body to the outside of the lower floating body may include the stacked plurality of solids While the solid ballast located at the bottom of the ballast sinks toward the base of the lower floating body, the tapered portion of the solid ballast located at the bottom of the ballast may contact at least a portion of the drain stopper to open the drain stopper.

The ballasting method of the offshore wind power generation floating body is, after the step of discharging water present in the lower floating body to the outside of the lower floating body, one or more solid ballasts are lifted by the crane and the lower floating body It may further include a step of loading on the top of the plurality of solid ballast loaded in.

The total height of the solid ballast loaded while the water is filled in the lower floating body may be higher than the total height of the solid ballast loaded after the water present in the lower floating body is discharged.

According to an embodiment of the present invention, a plurality of solid ballasts are sequentially loaded in a state where water is filled in the lower floating body, and the solid ballast is maintained in a floating state by the buoyancy of water filled in the lower floating body. do. In this case, since the main lifting line sufficiently reaches the upper end of the solid ballast, there is no need to keep the length of the main lifting line long, and the operator does not have to go down directly to the base of the lower floating body. In addition, when the weight of the plurality of solid ballasts loaded inside the lower floating body exceeds a threshold value, the plurality of solid ballasts are located at the base side of the lower floating body while sinking to the base side of the lower floating body. By opening the drain plug, water present in the lower floating body is discharged to the outside of the lower floating body. After that, the main lifting line can sufficiently reach the top of the solid ballast loaded inside the lower float, so that the solid ballast can be additionally loaded by a crane without the need to fill the inside of the lower float.

1 is a view showing an offshore wind turbine floating body according to an embodiment of the present invention
2 is a view showing a process in which a lower floating body is towed by a main working ship according to an embodiment of the present invention
3 is a view showing a process of dismantling a towing shackle and fixing a lower floating body with a guide gripper when a lower floating body according to an embodiment of the present invention arrives at a destination
4 is a view showing a process of advancing the moving arm to prepare for entering the lower floating body into the installation line according to an embodiment of the present invention
5 is a view showing a process of positioning a lower floating body to an installation position by entering the main work line into the installation line according to an embodiment of the present invention
6 is a view showing a process in which the main working ship and the installation ship are fixed to each other by a mooring ship according to an embodiment of the present invention
7 is a view showing a process of moving a moving arm to the rear in order to fix the position of a lower floating body according to an embodiment of the present invention
8 is a view showing a process of finely adjusting the position of a lower floating body by a tugboat according to an embodiment of the present invention
9 is a view showing a process of fixing the position and height of a lower floating body according to an embodiment of the present invention
10 is a view showing a process of filling water into an interior of a lower floating body according to an embodiment of the present invention
11 is a view showing a process in which a solid ballast is lifted by a crane according to an embodiment of the present invention
12 is a view showing a detailed configuration of a solid ballast according to an embodiment of the present invention
13 is a view showing a process of fastening and separating a lifting rope for lifting a solid ballast according to an embodiment of the present invention
14 is a view showing a process of lifting a solid ballast according to an embodiment of the present invention
15 is a view showing a process in which a solid ballast is loaded into a lower floating body according to an embodiment of the present invention
16 is a view showing a process in which a solid ballast is loaded into a lower floating body according to an embodiment of the present invention
17 is a view showing a process of discharging water present in the lower floating body to the outside of the lower floating body by the tapered portion of the solid ballast according to an embodiment of the present invention
18 is a view showing a process of discharging water present in the lower floating body to the outside of the lower floating body by the tapered portion of the solid ballast according to an embodiment of the present invention
19 is a cross-sectional view of a lower floating body according to an embodiment of the present invention
20 is a view viewed from above of a lower floating body according to an embodiment of the present invention
21 is a view showing a loading position of a solid ballast according to an embodiment of the present invention
22 is a view showing a process in which an upper floating body is assembled with a lower floating body at sea according to an embodiment of the present invention
23 is a view showing a process in which an upper floating body is assembled with a lower floating body at sea according to an embodiment of the present invention

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. The following detailed description is provided to aid in a comprehensive understanding of the methods, devices, and/or systems described herein. However, this is only an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification. The terms used in the detailed description are only for describing embodiments of the present invention, and should not be limiting. Unless explicitly used otherwise, expressions in the singular form include the meaning of the plural form. In the present description, expressions such as "comprising" or "feature" are intended to refer to certain features, numbers, steps, actions, elements, some or combination thereof, and one or more It should not be construed to exclude the presence or possibility of other features, numbers, steps, actions, elements, any part or combination thereof.

1 is a view showing an offshore wind turbine floating body 100 according to an embodiment of the present invention. As shown in Figure 1, the offshore wind power generation floating body 100 according to an embodiment of the present invention is a concrete block 101, a lower floating body 102, an upper floating body 103, and a column for buoyancy (103a) ).

The concrete block 101 is a structure disposed at the bottom of the offshore wind turbine floating body 100. The concrete block 101 reduces the shaking or movement of the offshore wind turbine floating body 100, for example, shake, pitch, roll, yaw, etc. It plays a role as a damper for reducing fluctuations that can be caused. This concrete block 101 may be made of a solid such as concrete, for example.

The lower floating body 102 is a structure disposed on the top of the concrete block 101 and may be formed of, for example, a rigid body made of iron. The lower floating body 102 may be formed in a cylindrical shape with an empty inside. As will be described later, the interior of the lower floating body 102, that is, a solid ballast part (not shown) may be filled with a solid ballast (for example, a concrete block), and accordingly, the center of gravity of the offshore wind power floating body 100 Can be positioned downwards. In this case, the draft depth of the offshore wind turbine generator 100 is increased, and the center of gravity may be located below the center of buoyancy.

The upper floating body 103 is a structure disposed on the upper end of the lower floating body 102. The upper floating body 103 may have a hollow cylindrical shape, and a liquid such as water may be filled in the upper floating body 103. In addition, the upper floating body 103 may be formed to be inclined so that the outer diameter of the cross section decreases toward one end and the other end. The offshore wind power generation floating body 100 may further attenuate the vertical fluctuation (Heave) through the upper floating body 103 in addition to the above-described lower floating body 102. In addition, the inclined structure of one end and the other end of the upper floating body 103 disperses the external force acting in the horizontal direction of the offshore wind power generation floating body 100 along the inclined surface, thereby distributing the offshore wind power generation floating body ( It can also dampen the horizontal fluctuation of the 100).

The buoyancy column 103a is a structure disposed on the upper end of the upper floating body 103. The buoyancy pillar 103a may be located on the water line from the upper side of the offshore wind turbine floating body 100, and thus, the horizontal fluctuation of the offshore wind turbine floating body 100 can be attenuated.

On the other hand, in the case of such an offshore wind power generation float 100, the length L is longer than 60 to 90 meters, so the process of filling a solid ballast (not shown) at the base of the lower float 102 to lower the center of gravity This is essential. However, since the length L of the offshore wind turbine float 100 is long, it is not easy to fill the solid ballast from the upper side of the offshore wind turbine float 100. In particular, by filling the inside of the offshore wind power generation floating body 100 with water and removing the water while the offshore wind power generation floating body 100 is standing at sea, a solid ballast is placed inside the offshore wind power generation floating body 100. The injection process is not an easy operation in a sea environment with strong waves and wind.

In addition, as shown in Fig. 1, after installing a transfer pipe (S) for injecting solid ballast into the interior of the offshore wind power generation floating body (100), the lower floating body (102) through the transfer pipe (S). Solid ballast may be injected up to the base of, but in this case, the conveying pipe (S) must be made as long as the length (L) of the offshore wind turbine floating body (100), and for injection of the solid ballast through the conveying pipe (S) There are problems such as having to provide separate equipment. In addition, it is not easy to maintain and control the balance of the floating body during the process of filling the solid ballast in a sea environment where waves and winds are strong.

Therefore, in the present invention, instead of injecting the solid ballast into the interior of the offshore wind power generation floating body 100 through the transfer pipe (S), the solid ballast in the form of a block manufactured on land is lifted and the interior of the lower floating body 102 The method of loading in was applied.

Hereinafter, a method of ballasting by loading a plurality of solid ballasts inside the lower floating body 102 will be described in more detail.

■ Sea transportation and preparation stage of the lower floating body 102

2 is a view showing a process in which the lower floating body 102 is towed by the main work line 106 according to an embodiment of the present invention.

Referring to FIG. 2, the lower floating body 102 manufactured on land may be towed by the main working ship 106 and transported to the destination by sea. Here, the lower floating body 102 may be towed by the main work line 106 while being combined with the concrete block 101. At this time, an empty space inside the lower floating body 102 may be designed so that the lower floating body 102 has a buoyancy enough to be towed in a floating state, and the concrete block 101 and the lower floating body ( The weight of 102) can also be designed for this buoyancy. In addition, a plurality of solid ballasts 104 for filling the empty space inside the lower floating body 102 may be loaded on the main work line 106.

3 is a diagram illustrating a process of dismantling the towing shackle 108 and fixing the lower floating body 102 with a guide gripper 110 when the lower floating body 102 according to an embodiment of the present invention arrives at a destination. It is a drawing.

Referring to FIG. 3, the lower floating body 102 may be fastened to the main work vessel 106 through a towing shackle 108. Thereafter, when the lower floating body 102 arrives at the destination, the towing shackle 108 is disassembled, and the lower floating body 102 is further fixed with the guide gripper 110 so that the lower floating body 102 is not shaken by waves or the like. I can make it.

4 is a view showing a process of advancing the moving arm 112 in preparation for entering the lower floating body 102 into the installation line 202 according to an embodiment of the present invention.

Referring to FIG. 4, a moving arm 112 for moving the lower floating body 102 forward or backward may be formed to protrude from the guide gripper 110. The moving arm 112 may be in close contact with the lower floating body 102 at both sides of the lower floating body 102 and fixed thereto. The moving arm 112 may move forward or backward by, for example, a hydraulic cylinder (not shown), and the lower floating body 102 may move forward or backward together with the moving arm 112.

When the lower floating body 102 arrives at the destination, the moving arm 112 of the guide gripper 110 is advanced to enter the ship on which the upper floating body 103 is mounted, that is, the installation ship 202 to be described later. You can prepare for it.

■ Step of fixing the installation position of the lower floating body 102

5 is a view showing a process of positioning the lower floating body 102 to the installation position by entering the main work line 106 according to an embodiment of the present invention to the installation line 202.

Referring to FIG. 5, the installation ship 202 is fixed to the seabed of the destination through a seabed mooring ship (not shown), and an upper floating body 103 is mounted thereon. Further, the installation line 202 may be provided with an installation skid jack 204 for moving the upper floating body 103 forward or backward, or lifting or lowering the upper floating body 103. The main work line 106 may enter the installation line 202 to fix the installation position of the lower floating body 102.

6 is a view showing a process in which the main working ship 106 and the installation ship 202 are fixed to each other by the mooring ship 208 according to an embodiment of the present invention.

Referring to FIG. 6, the main work line 106 and the installation line 202 may be fixed to each other by a mooring line 208. The mooring lines 208 are, for example, connected to one side of the main work line 106 and one side of the installation line 202, respectively, to fix the main work line 106 and the installation line 202 to each other. However, this is only an example, and the location and number of the mooring lines 208 are not limited thereto.

In addition, as shown in Figure 6, the lower floating body fixing monorail support 210 is installed on the installation line 202, the lower floating body fixing monorail support 210, the lower floating body fixing monorail 212 Can be installed. The monorail 212 for fixing the lower floating body may move vertically and horizontally. As will be described later, the installation position of the lower floating body 102 may be fixed through the monorail 212 for fixing the lower floating body.

7 is a diagram illustrating a process in which the moving arm 112 moves backward in order to fix the position of the lower floating body 102 according to an embodiment of the present invention.

Referring to FIG. 7, when the main work line 106 and the installation line 202 are fixed to each other by the mooring line 208, the moving arm 112 has a monorail 212 for fixing the lower floating body. It can be moved to the outside of the lower floating body 102 to be located on both sides of 102). That is, the moving arm 112 of the guide gripper 110 may move its position so that it does not come into close contact with the lower floating body 102.

8 is a view showing a process of finely adjusting the position of the lower floating body 102 by the tugboat 214 according to an embodiment of the present invention.

Referring to FIG. 8, the tugboat 214 may be connected to one side of the lower floating body 102 through a wire (not shown), and the position of the lower floating body 102 can be finely adjusted through the wire. Accordingly, the tugboat 214 may help a monorail lifting line (not shown) to be described later to be fastened to a predetermined position.

9 is a view showing a process of fixing the position and height of the lower floating body 102 according to an embodiment of the present invention.

As described above, the moving of the guide gripper 110 connected to the main work line 106 so that the monorail 212 for fixing the lower floating body installed on the installation line 202 can be located on both sides of the lower floating body 102 The lower floating body 102 may be moved through the arm 112.

Referring to FIG. 9, a monorail lifting shaft 304 is connected to a monorail 212 for fixing a lower floating body, and a vertical fluctuation reducer 306 (heave compensator) may be installed on the monorail lifting shaft 304. When the lower floating body fixing monorail 212 is located on both sides of the lower floating body 102, the monorail lifting rope 304 is fastened to the lifting holes 302 protruding from both sides of the lower floating body 102. In this way, the position of the lower floating body 102 may be fixed. In addition, the height of the lower floating body 102 can be kept constant by the vertical shake reducer 306 installed on the monorail lifting line regardless of the situation in which the installation line 202 is shaken up and down by waves or the like.

■ Loading stage of solid ballast (104)

10 is a view showing a process of filling water into the lower floating body 102 according to an embodiment of the present invention.

Referring to FIG. 10, water may be filled with an empty space, that is, a solid ballast part 308 of the lower floating body 102 while the position of the lower floating body 102 is fixed.

In the case of the solid ballast part 308, the depth is so deep that it reaches about 30 meters, and it is not easy to load the solid ballast 104 to the base of the lower floating body 102 by a general lifting method. In particular, since there is no space for the worker inside the lower floating body 102, the worker cannot access it, so it is very difficult to load the solid ballast 104 by a general lifting method. Accordingly, in the present invention, the solid ballast 104 can be loaded as the solid ballast part 308 in a state in which water is filled in the inner empty space of the lower floating body 102, that is, the solid ballast part 308. However, if the solid ballast part 308 is filled with water, the lower floating body 102 may sink due to the weight of the water, so the position of the lower floating body 102 is fixed by the monorail lifting line 304 described above. In the state, it is preferable to fill the solid ballast part 308 with water.

11 is a view showing a process in which the solid ballast 104 is lifted by a crane according to an embodiment of the present invention.

Referring to FIG. 11, a plurality of solid ballasts 104 may be lifted by a crane and sequentially loaded into the lower floating body 102 in a state where water is filled in the lower floating body 102. At this time, the solid ballast 104 may be lifted through a wire connected to the lifting beam 310 and the lifting aid 312 of the crane.

12 is a view showing a detailed configuration of the solid ballast 104 according to an embodiment of the present invention. Figure 12 (a) is a view viewed from the upper side of the solid ballast 104 according to an embodiment of the present invention, Figure 12 (b) is a solid ballast 104 according to an embodiment of the present invention from the lower side This is a view you see.

형상을 가질 수 있다. 후술할 바와 같이, 크레인에 연결된 주 인양삭(미도시)이 상기 걸림쇠(314)에 체결되어 고체 밸러스트(104)를 들어올릴 수 있다.Referring to FIG. 12, a plurality of grooves may be formed on the solid ballast 104, and a catch 314 may be provided in each groove. At this time, the catch 314 is, for example,

It can have a shape. As will be described later, the main lifting line (not shown) connected to the crane is fastened to the stopper 314 to lift the solid ballast 104.

In addition, a first fitting portion 316 for ballast fitting is formed in the lower portion of the solid ballast 104, and a second fitting portion having a shape corresponding to the first fitting portion 316 is formed in the upper portion of the solid ballast 104 318 may be formed. As will be described later, in the process of sequentially loading the plurality of solid ballasts 104 into the lower floating body 102, the first fitting portion 316 of the solid ballast 104 is at the bottom of the solid ballast 104. It can be sequentially loaded by fitting into the second fitting portion 318 of the other loaded solid ballast.

In addition, a tapered portion 328 having a tapered shape may be formed on the lowermost side of the solid ballast 104. As will be described later, the solid ballast located at the bottom of the plurality of solid ballasts 104 loaded on the lower floating body 102 sinks to the base side of the lower floating body 102, and the base side of the lower floating body 102 Water present in the lower floating body 102 may be discharged to the outside of the lower floating body 102 by opening the drain plug (not shown) located at.

13 is a view showing a process in which the lifting rope for lifting the solid ballast 104 is fastened and separated according to an embodiment of the present invention.

First, the main lifting line 320 connected to the crane may be fastened to the stopper 314. The main lifting line 320 may be fastened to the stopper 314 while descending by fine adjustment of the crane. In addition, the operator may climb to the top of the solid ballast 104 on the main work line 106 and fasten the main lifting line 320 to the stopper 314. At this time, the number and position of the stoppers 314 and the main lifting shaft 320 shown in FIGS. 12 and 13 are not particularly limited.

Next, the crane can lift the solid ballast 104 through the main lifting line (320).

Next, the solid ballast 104 may be loaded into the inside of the lower floating body 102 filled with water, that is, the solid ballast part 308. In this case, as the solid ballast 104 is loaded into the lower floating body 102, it can maintain a floating state by the buoyancy of water filled in the lower floating body 102.

형상을 가질 수 있으며, 이에 따라 보조 인양삭(322)이 당겨지면 상기 보조 인양삭(322)과 연결된 주 인양삭(320)이 상기 걸림쇠(314)로부터 보다 용이하게 분리될 수 있다. 상기 보조 인양삭(322)은 예를 들어, 상술한 리프팅 빔(310)에 연결된 유압잭(미도시)을 통해 앞뒤로 이동할 수 있으며, 보조 인양삭(322)의 이동에 따라 주 인양삭(320)이 보조 인양삭(322)과 함께 이동하여 걸림쇠(314)로부터 분리될 수 있다. Next, the main lifting shaft 320 fastened to the bracket 314 by pulling the auxiliary lifting shaft 322 connected to the main lifting shaft 320 may be separated. At this time, if the length of the main lifting line 320 is long, it may be difficult to separate the main lifting line 320 from the stopper 314 even if the auxiliary lifting line 322 is pulled. However, when the lower floating body 102 is filled with water to keep the solid ballast 104 floating in the water, the length of the main lifting shaft 320 can be adjusted as short as possible. In this state, when the auxiliary lifting shaft 322 is pulled by fine adjustment of the crane, the main lifting shaft 320 fastened to the bracket 314 may be more easily separated. As described above, the catch 314 is

It may have a shape, and accordingly, when the auxiliary lifting shaft 322 is pulled, the main lifting shaft 320 connected to the auxiliary lifting shaft 322 may be more easily separated from the stopper 314. The auxiliary lifting shaft 322 can be moved back and forth through a hydraulic jack (not shown) connected to the above-described lifting beam 310, and the main lifting shaft 320 according to the movement of the auxiliary lifting shaft 322 It can be separated from the stopper 314 by moving together with the auxiliary lifting line 322.

14 is a view showing a process in which the solid ballast 104 is lifted according to an embodiment of the present invention.

Referring to FIG. 14, a plurality of solid ballasts 104 may be sequentially loaded into the lower floating body 102 in the same manner as described above. That is, the plurality of solid ballasts 104 may be lifted by a crane while the inside of the lower floating body 102 is filled with water and sequentially loaded into the inside of the lower floating body 102.

15 and 16 are views showing a process in which the solid ballast 104 is loaded into the lower floating body 102 according to an embodiment of the present invention.

15 shows a state in which the solid ballast 104 according to an embodiment of the present invention is maintained in a floating state by the buoyancy of water filled in the lower floating body 102, and FIG. 16 is a lower floating body 102 ), when the weight of the plurality of solid ballasts 104 loaded in the inside of the unit is greater than or equal to the threshold value, the plurality of solid ballasts 104 are settled toward the base side of the lower floating body 102.

Referring to FIG. 15, the solid ballast 104 may maintain a floating state by buoyancy of water filled in the lower floating body 102. That is, when the weight of the solid ballast 104 loaded inside the lower floating body 102 is less than the buoyancy of the water filled inside the lower floating body 102, the solid ballast 104 is It can remain floating in the water without sinking to the base. In this state, other solid ballasts may be sequentially loaded onto the top of the solid ballast 104 loaded on the lower floating body 102. The solid ballast 104 loaded on the lower floating body 102 is the lower floating body until the next solid ballast is loaded after the main lifting line 320 fastened to the catch 314 of the solid ballast 104 is separated. It may remain floating due to the buoyancy of the water filled in (102).

Referring to FIG. 16, when the weight of the plurality of solid ballasts 104 loaded in the lower floating body 102 is greater than or equal to the threshold value, the plurality of solid ballasts 104 are formed at the base of the lower floating body 102. It sinks to the side. That is, when the weight of the plurality of solid ballasts 104 loaded in the lower floating body 102 becomes larger than the buoyancy of water filled in the lower floating body 102, the plurality of solid ballasts 104 It may sink to the basal side of fluid 102.

17 and 18 show that water present in the lower floating body 102 is discharged to the outside of the lower floating body 102 by the tapered portion 328 of the solid ballast 104 according to an embodiment of the present invention. It is a diagram showing the process of becoming.

As described above, a tapered portion 328 having a tapered shape may be formed on the lowermost side of the solid ballast 104. In addition, a drain plug 326 may be formed on the base side of the solid ballast 104. In this case, the drain pipe 324 may be used for discharging the water filled in the lower floating body 102 to the outside of the lower floating body 102 by passing through the inside of the lower floating body 102.

When the solid ballast located at the bottom of the plurality of solid ballasts 104 loaded on the lower floating body 102 sinks to the base side of the lower floating body 102, the tapered portion 328 of the solid ballast located at the bottom is drained. The drain stopper 326 may be opened by contacting at least a portion of the stopper 326.

In addition, a sensing unit (not shown) for detecting whether the drain plug 326 is open may be formed near the drain plug 326, and when the drain plug 326 is opened, the sensing unit It may be detected by the notification to the operator of the main work line 106. The notification method may include various methods such as wireless signal, sound, and light emission, and is not limited to a specific method. In this way, the operator can check whether the solid ballast 104 is normally seated on the base of the lower floating body 102 by recognizing that the drain plug 326 is open. In addition, when water filled in the lower floating body 102 through the drain plug 326 is discharged to the outside of the lower floating body 102, the outer wall end of the drain pipe 324 (that is, the lower floating body 102) The automatic opening/closing waterproof door (Hatch cover, not shown) installed on the drain pipe 324 adjacent to the outer wall side of the can be automatically closed, thereby preventing water from flowing from the outside of the lower floating body 102. I can. The automatic opening/closing waterproof door may operate as, for example, a sensor installed in the drain pipe 324 detects that all water has been discharged to the outside of the lower floating body 102, but the operation method is not limited thereto.

According to an embodiment of the present invention, a plurality of solid ballasts 104 are sequentially loaded in a state where water is filled in the lower floating body 102, and the solid ballast 104 is the lower floating body 102 It remains floating due to the buoyancy of the water filled in. In this case, since the main lifting line 320 reaches the upper end of the solid ballast 104 sufficiently, there is no need to keep the length of the main lifting line 320 long, and the operator can directly descend to the base of the lower floating body 102. There is no need. In addition, when the weight of the plurality of solid ballasts 104 loaded inside the lower floating body 102 is greater than or equal to a threshold, the plurality of solid ballasts 104 are moved toward the base side of the lower floating body 102. While sinking, the drain plug 326 located at the base side of the lower floating body 102 is opened, and water present in the lower floating body 102 is discharged to the outside of the lower floating body 102. After that, the main lifting line 320 can reach the upper end of the solid ballast 104 loaded inside the lower floating body 102 sufficiently, so that the crane does not need to fill the inside of the lower floating body 102 with water. Thus, the solid ballast 104 can be additionally loaded.

19 is a cross-sectional view of a lower floating body 102 according to an embodiment of the present invention, and FIG. 20 is a view viewed from above of the lower floating body 102 according to an embodiment of the present invention.

19 and 20, the lower floating body 102 is located at the top of the concrete block 101, and includes a solid ballast portion 308 and a hollow tube 330 for buoyancy. The hollow tube 330 for buoyancy may be formed on the outside of the solid ballast part 308, and the inside may be empty like the solid ballast part 308. The hollow tube 330 for buoyancy is formed on the outside of the solid ballast part 308 to protect the solid ballast part 308 from impacts caused by waves, wind, etc., and collisions caused by a submarine. In addition, when it is necessary to adjust the height of the offshore wind power generation floating body 100, the height of the offshore wind power generation floating body 100 may be adjusted by filling the hollow tube 330 for buoyancy with water.

In addition, the drain pipe 324 may be formed in a tubular shape, for discharging the water filled in the lower floating body 102 to the outside of the lower floating body 102 by penetrating the inside of the lower floating body 102 It is used for the purpose.

21 is a view showing a loading position of the solid ballast 104 according to an embodiment of the present invention.

Referring to FIG. 21, #1 to #2 solid ballast 104 maintains a floating state in the water filled in the lower floating body 102 in the process of being sequentially loaded into the interior of the lower floating body 102. I can. Thereafter, when the #3 solid ballast 104 is loaded into the lower floating body 102, the #1 to #3 solid ballast 104 goes to the base side of the lower floating body 102 due to its weight. I can sit down. Accordingly, the drain plug 326 located at the base side of the lower floating body 102 is opened so that water present in the lower floating body 102 can be discharged to the outside of the lower floating body 102.

Thereafter, #4 to #N-th solid ballast 104 may be sequentially loaded into the interior of the lower floating body 102 by a crane while water is discharged. In this case, since the main lifting line 320 reaches the upper end of the solid ballast 104 sufficiently, there is no need to keep the length of the main lifting line 320 long, and the operator can directly descend to the base of the lower floating body 102. There is no need.

To this end, as shown in FIG. 21, the total height of the solid ballast 104 loaded in the state where water is filled in the lower floating body 102 is discharged from the water present in the lower floating body 102. It may be higher than the total height of the solid ballast 104 loaded thereafter.

22 and 23 are views showing a process in which the upper floating body 103 is assembled with the lower floating body 102 at sea according to an embodiment of the present invention.

Referring to FIG. 22, when the mounting of the solid ballast 104 is completed, the upper floating body 103 can be pushed to a proper position to be assembled with the lower floating body 102 through the installation skid jack 204 and positioned. At this time, the installation line deck 402 is provided on the upper part of the installation skid jack 204, and the upper floating body 103 is brought in to the correct position by using a hydraulic jack 404 for separation from the installation line deck 402. Can be located.

Referring to FIG. 23, when the upper floating body 103 is in a correct position, the hydraulic jack 404 is lowered to bring the upper floating body 103 to the lower floating body 102. At this time, the vertical position of the upper floating body 103 may be finely adjusted by using a ballast (not shown) provided on the installation line 202 so that the upper floating body 103 can sit on the lower floating body 102.

Although the present invention has been described in detail through the exemplary embodiments above, those of ordinary skill in the art to which the present invention pertains have found that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. I will understand. Therefore, the scope of the present invention is limited to the described embodiments and should not be defined, and should not be determined by the claims to be described later, but also by those equivalents to the claims.

100: offshore wind power generation floating body
101: concrete block
102: lower floating body
103: upper floating body
104: solid ballast
106: main work line
108: Towing shackle
110: guide gripper
112: moving rock
202: installation line
204: Installation skid jack
208: mooring ship
210: Monorail support for fixing the lower floating body
212: Monorail for fixing the lower floating body
214: tugboat
302: Inyanggu
304: Monorail lifting cutting
306: vertical fluctuation reduction
308: solid ballast part
310: lifting beam
312: lifting aid
314: stop
316: first fitting portion
318: second fitting portion
320: main lifting line
322: auxiliary lifting cutting
324: drain pipe
326: drain plug
328: tapered portion
330: hollow tube for buoyancy
402: installation ship deck
404: hydraulic jack

Claims (9)

A lower floating body made of a hollow cylindrical shape is towed by the main work vessel and transported by sea to a destination;
Fixing the position of the lower floating body by the main work line and the installation line;
Filling water into the lower floating body while the position of the lower floating body is fixed;
A step in which a plurality of solid ballasts are lifted by a crane while the lower floating body is filled with water and sequentially loaded into the lower floating body;
When the weight of the plurality of solid ballasts loaded in the lower floating body exceeds a threshold value, the plurality of solid ballasts sinking toward the base of the lower floating body; And
While the solid ballast located at the bottom of the plurality of loaded solid ballasts sinks to the base side of the lower floating body, the drain plug located at the base side of the lower floating body is opened, and the water present inside the lower floating body is removed from the bottom. Ballasting method of an offshore wind turbine floating body comprising the step of discharging to the outside of the floating body.
The method according to claim 1,
The step of fixing the position of the lower floating body,
The lower floating body is moved through a moving arm of a guide gripper connected to the main work line so that the monorail for fixing the lower floating body installed on the installation line can be positioned on both sides of the lower floating body. Letting go;
Fastening the monorail lifting rope connected to the lower floating body fixing monorail to the lifting holes protruding from both sides of the lower floating body; And
And maintaining the height of the lower floating body by a heave compensator installed on the monorail lifting line.
The method according to claim 1,
The solid ballast has a latch formed on the top,
The step of sequentially loading the plurality of solid ballasts,
A step in which the main lifting rope connected to the crane is fastened to the stopper;
Lifting the solid ballast through the main lifting line;
Loading the solid ballast into the lower floating body; And
A ballasting method of an offshore wind turbine floating body comprising the step of separating the main lifting rope fastened to the stop by pulling the auxiliary lifting rope connected to the main lifting rope.
The method of claim 3,
The catch,

Ballasting method of a floating body of offshore wind power having a shape.
The method of claim 3,
In the solid ballast, a first fitting portion for fitting the ballast is formed at a lower portion, and a second fitting portion having a shape corresponding to the first fitting portion is formed at an upper portion,
In the step of loading the solid ballast into the interior of the lower floating body, the first fitting part of the solid ballast is loaded by fitting the second fitting part of another solid ballast loaded on the lower end of the solid ballast, Ballasting method of floating body for offshore wind power generation.
The method according to claim 1,
Before the step of sinking the plurality of solid ballasts to the base side of the lower floating body,
The ballasting method of an offshore wind power generation floating body further comprising the step of maintaining a state in which the plurality of solid ballasts loaded in the lower floating body are floating by the buoyancy of water filled in the lower floating body.
The method according to claim 1,
The solid ballast is formed with a tapered portion for opening the drain plug on the lowermost side,
In the step of discharging the water present in the lower floating body to the outside of the lower floating body, the solid ballast located at the bottom of the loaded solid ballasts sinks to the base side of the lower floating body and is at the bottom end. Ballasting method of an offshore wind turbine floating body in which the tapered portion of the located solid ballast contacts at least a portion of the drain plug to open the drain plug.
The method according to claim 1,
After the step of discharging water present in the lower floating body to the outside of the lower floating body,
At least one solid ballast is lifted by the crane and loaded on the upper portion of the plurality of solid ballasts loaded on the lower floating body.
The method of claim 8,
The total height of the solid ballast loaded while the water is filled in the lower floating body is higher than the total height of the solid ballast loaded after the water present in the lower floating body is discharged, offshore wind power generation unit The method of ballasting the fluid.

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