JP5732150B1 - Tower-type floating structure and installation method thereof - Google Patents

Abstract

The present invention provides a tower-type floating structure that can be easily installed on the water with a simple configuration without using a large facility such as a large crane ship, and an installation method thereof. An offshore wind turbine equipped with a bottomed cylindrical tower structure 2 capable of generating buoyancy and installed on the ocean, a second ballast section 12 and a second ballast section 12 inside the tower structure 2 are provided. A third ballast section 13 is provided above the ballast section 12. Then, the ballast 21 is filled with the fluidized ballast 21 in the third ballast section 13 to keep the offshore wind turbine 1A in a rollover state on the ocean. The offshore wind turbine 1A is installed on the ocean by moving the fluidity ballast 21 in 13 into the second ballast section 12 and shifting the offshore wind turbine 1A from the rollover state to the upright state. [Selection] Figure 2

Description

  The present invention relates to a tower-type floating structure installed on the water of a sea, a large river, a lake, and the like, and in particular, a tower-type floating structure such as a wind power generation facility installed on the ocean and the tower-type floating structure. Is related to the installation method.

  Conventionally, as a tower type floating structure installed on the water, for example, there is a spar type floating offshore wind power generation facility. This wind power generation facility uses a tower structure in which the upper part of the tower, which is a columnar structure on the surface of the water, is installed on the floating body to obtain buoyancy under the surface of the water. Is assembled. Note that the height of the entire tower-type floating structure is approximately 50 to 200 m.

Generally, this type of wind power generation facility is installed offshore as follows.
First, the floating body is floated upright in an installation sea area with a water depth of about 50 m or more. Then, the tower top, nacelle, windmill blades, etc. are attached using a large crane ship.

  By the way, since there are many days with strong waves and winds in the open ocean with a water depth of about 50 m or more, there is a problem that the operating rate of the offshore installation work using a large crane ship is greatly reduced, and the cost of the installation work is increased.

  As a technique that can solve such a problem, there is a technique proposed in Patent Document 1, for example.

JP 2012-202250 A

Patent Document 1 discloses a spar-type floating offshore wind power generation facility having a foundation having a tank and a plurality of compartments in the vertical direction and a method for installing the spar-type floating offshore wind power generation facility.
In this installation method, the foundation, tower, and windmill are assembled on land in advance, the foundation tank is empty, and ballast water is poured into each of the multiple compartments, so that the foundation is floated on the sea in a lying state. Tow the wind power generation facility that has been laid down to the installation area, and when it arrives at the installation location, inject seawater etc. into the foundation tank from the outside, and ballast water in the upper compartment of the multiple compartments The foundation is made upright by the couple of the center of gravity and buoyancy.

  According to the spar type floating offshore wind power generation facility according to Patent Document 1, since the foundation can be shifted to an upright state by performing water injection to the foundation tank and drainage from the upper side compartment, a large crane It can be installed without using a ship, the installation work efficiency can be greatly improved, and the cost of the installation work can be greatly reduced.

  However, in the spar type floating offshore wind power generation facility of Patent Document 1, not only the tank but also a plurality of compartments must be formed in the vertical direction inside the foundation, and there is a problem that the structure becomes complicated. . Further, when the foundation is set upright, both the water injection into the foundation tank and the drainage from the upper side compartment must be performed, and there is a problem that the work is complicated.

  The present invention has been made in view of the above-described problems, and a tower-type floating structure that can be easily installed on the water with a simple configuration without using a large-scale facility such as a large crane ship and the like. The purpose is to provide an installation method.

In order to achieve the above object, a tower-type floating structure according to the first invention is provided,
A tower-type floating structure equipped with a cylindrical tower structure capable of generating buoyancy and installed on the water,
An upper ballast chamber that is vertically arranged inside the tower structure and a lower ballast chamber that is empty or semi-mounted inside are provided, and the upper ballast chamber and the lower ballast chamber are connected by a pipe line. In addition to connecting and opening and closing means for opening and closing the pipe, the ballast having fluidity is filled in the upper ballast chamber while the pipe opening and closing means is closed, so that the rollover state is maintained on the water. together so as to, by moving the operation to open and the upper ballast chamber ballast the conduit opening and closing means to said lower ballast chamber, is characterized in that so as to shift from the rollover state upright Is.

The tower type floating structure according to the second invention is
A tower-type floating structure equipped with a cylindrical tower structure capable of generating buoyancy and installed on the water,
An upper ballast chamber and a lower ballast chamber that are arranged vertically are provided inside the tower structure, respectively, and a draft adjustment ballast chamber is provided so as to be positioned near the draft line in an upright state above the upper ballast chamber, by filling the ballast with a respective internal on the flowability of the upper ballast chamber and the draft adjusting ballast chamber, as well as to hold the roll state on the water, the upper ballast chamber ballast to the lower ballast chamber It is characterized in that it is shifted from the rollover state to the upright state by being moved, and the draft is adjusted by discharging the ballast in the draft adjustment ballast chamber after standing upright.

In the first or second aspect, moves from the upper ballast chamber ballast to the lower ballast chamber is a gravity movement (third invention).

  In the second invention, the discharge of the ballast in the draft adjustment ballast chamber is a gravity drainage (fourth invention).

Next, the installation method of the tower type floating structure according to the fifth invention is as follows.
A tower-type floating structure installation method according to the first invention,
Towing the tower-type floating structure to the installation water area in a rollover state;
A step of shifting to an upright state by moving the upper ballast chamber ballast in the tower water structure in the lower ballast chamber said tower water structure from rollover state at the installation waters,
It is characterized by including.

Moreover, the installation method of the tower type floating structure according to the sixth invention is as follows.
A tower-type floating structure installation method according to the second invention,
Towing the tower-type floating structure to the installation water area in a rollover state;
A step of shifting to an upright state by moving the upper ballast chamber ballast in the tower water structure in the lower ballast chamber said tower water structure from rollover state at the installation waters,
And adjusting the draft of the tower water structure by discharging the draft adjusting ballast chamber ballast after an upright of the tower water structure,
It is characterized by including.

According to the tower-type floating structure of the first aspect of the present invention, the upper ballast chamber and the lower ballast chamber that are arranged vertically are respectively provided in the cylindrical tower structure that can generate buoyancy. By filling the inside with a ballast having fluidity, the rollover state is maintained on the water, so that it is possible to tow easily even if there is a shallow water depth before reaching the installation water area.
In addition, the ballast in the upper ballast chamber is opened to the lower ballast chamber in which the inner ballast is empty or semi-mounted by opening the pipe opening / closing means arranged in the pipe connecting the upper ballast chamber and the lower ballast chamber. By moving, since the rollover state is shifted to the upright state, it can be installed on the water without using a large-scale facility such as a large crane ship.
Such an operational effect is a simple configuration in which an upper ballast chamber and a lower ballast chamber are provided inside the cylindrical tower structure, and the upper ballast chamber is filled with fluid ballast. This can be achieved by an easy work process of moving the ballast in the upper ballast chamber into the lower ballast chamber.

According to the tower-type floating structure according to the second aspect of the present invention, the upper ballast chamber and the lower ballast chamber that are arranged vertically are provided inside the cylindrical tower structure that can generate buoyancy, and further, A draft adjustment ballast chamber is provided so as to be located near the draft line in the upright state above, and the rollover state is maintained on the water by filling each of the upper ballast chamber and the draft adjustment ballast chamber with fluid ballast. Therefore, similarly to the tower-type floating structure of the first invention, it can be easily towed even if there is a shallow water depth before reaching the installation water area.
Further, since the ballast in the upper ballast chamber is moved to the lower ballast chamber, the rollover state is shifted to the upright state, so that large equipment such as a large crane ship is provided in the same manner as the tower type floating structure of the first invention. It can be installed on the water without using.
Further, the draft can be adjusted by discharging the ballast in the draft adjustment ballast chamber after standing upright, and the mooring tension can be adjusted when moored by a mooring chain or the like.
Such an operational effect is achieved by providing an upper ballast chamber, a lower ballast chamber, and a draft adjustment ballast chamber inside the cylindrical tower structure so that fluidity is provided in each of the upper ballast chamber and the draft adjustment ballast chamber. This can be achieved by a simple configuration such as filling the ballast that the ballast has, and by moving the ballast in the upper ballast chamber into the lower ballast chamber and discharging the ballast in the draft adjustment ballast chamber after standing upright.

  According to the tower type floating structure of the third invention, since the movement of the ballast from the upper ballast chamber to the lower ballast chamber is a gravity movement, a pump or the like for moving the ballast is unnecessary, and the structure is simple. Can be achieved.

  According to the tower type floating structure of the fourth aspect of the invention, since the discharge of the ballast in the draft adjustment ballast chamber is the gravity drainage, the structure can be simplified similarly to the third aspect of the invention.

  According to the tower-type floating structure installation method of the fifth invention, the tower-type floating structure is towed to the installation water area in a rollover state, so it is easy even if there is a shallow water depth before reaching the installation water area Can be towed into. Also, in the installation water area, simply moving the ballast in the upper ballast chamber of the tower type floating structure to the lower ballast chamber, the tower type floating structure is shifted from the rollover state to the upright state. It can be installed on the water with an easy work process without using large-scale equipment.

  Needless to say, according to the tower-type floating structure installation method of the sixth aspect of the invention, the same operational effects as the tower-type floating structure installation method of the fifth aspect of the invention can be obtained. Furthermore, according to the tower-type floating structure installation method of the sixth aspect of the present invention, draft adjustment can be performed by discharging the ballast in the draft adjustment ballast chamber after the tower-type floating structure is upright in the installation water area. In addition, the mooring tension can be adjusted when mooring with a mooring chain or the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the wind power generation facility as a tower type | mold floating structure which concerns on the 1st Embodiment of this invention, (a) is structure explanatory drawing, (b) is a state figure on the side on the sea. It is a figure which shows the transition from the rollover state on the sea of the wind power generation equipment of 1st Embodiment to an upright state. It is explanatory drawing of the installation system of a wind power generation equipment, (a) is a state figure in the case of floating on the ocean, (b) is a state figure in the case of landing on the seabed. It is a figure which shows the wind power generation facility as a tower type floating structure which concerns on the 2nd Embodiment of this invention, (a) is structure explanatory drawing, (b) is a state figure on the side on the sea. It is a figure which shows the transition from the rollover state on the sea of the wind power generation equipment of 2nd Embodiment to an upright state. It is explanatory drawing of draft adjustment of the wind power generation equipment of 2nd Embodiment. It is explanatory drawing of the modification of the wind power generation facility of each embodiment.

  Next, specific embodiments of the tower-type floating structure and its installation method according to the present invention will be described with reference to the drawings. The embodiment described below is an example in which the present invention is applied to a wind power generation facility (hereinafter referred to as “offshore windmill”) installed on the ocean as a tower-type floating structure. The present invention is not limited, and can be widely applied to tower-type floating structures installed on the water such as seas, large rivers, and lakes.

[First Embodiment]
<Outline explanation of offshore windmill>
An offshore wind turbine 1A shown in FIG. 1 (a) is a spar type floating offshore wind turbine having a total length of about 50 to 200 m installed on the ocean with a water depth of about 50 m or more, and can generate buoyancy as a spar type floating body. A tower structure 2 having a bottom cylindrical shape is provided, and a nacelle 3 and a windmill blade 4 are assembled to the top of the tower structure 2.

<Description of tower structure>
The tower structure 2 has a plurality of ballast sections 11, 12, 13 formed by partitioning the inside thereof with required partition plates 5, 6, 7, and 8, that is, a first position located at the bottom of the tower structure 2. In addition to the first ballast section 11, a second ballast section 12 and a third ballast section 13 are sequentially provided above the first ballast section 11. Each of the ballast sections 11 to 13 constitutes a ballast chamber having an accommodating portion capable of accommodating a required ballast (the same applies to a fourth ballast section described later).
The second ballast section 12 corresponds to the “lower ballast chamber” of the present invention, and the third ballast section 13 corresponds to the “upper ballast chamber” of the present invention.

<Description of the first ballast section>
The first ballast section 11 is filled with ballast 20 such as concrete, sand, gravel or water. The ballast 20 is fixedly provided in a sealed state in the first ballast section 11 and is hereinafter referred to as “fixed ballast 20”.

<Description of the second and third ballast sections>
The second ballast section 12 is empty or semi-mounted inside, while the third ballast section 13 has a fluid ballast 21 (hereinafter referred to as “fluid ballast 21”). Is filled.
Here, as the fluidity ballast 21, for example, a liquid such as fresh water or seawater, or a granular material such as sand or gravel can be used. Liquids such as fresh water and seawater have an advantage that the moving process from the third ballast section 13 to the second ballast section 12 described later can be performed more smoothly. In particular, if fresh water is used, measures against corrosion due to salt are omitted. This is more preferable. Moreover, since granular materials, such as sand and gravel, generally have a higher density than liquids such as fresh water and seawater, there is an advantage that it is possible to save space in the ballast compartment.

<Description of the pipe opening and closing means>
Between the 2nd ballast division 12 and the 3rd ballast division 13, the pipe line opening-and-closing means which opens and closes the piping 22 which is a pipe line which connects both sections is provided. This pipe opening / closing means is constituted by a valve device 23 interposed in the middle of the pipe 22.

  The pipe 22 is arranged so as to connect the partition plates 6 and 7 facing each other in the second ballast section 12 and the third ballast section 13 in a communicating state, and the fluidity ballast 21 in the third ballast section 13 is connected. It can be moved into the second ballast section 12 through the pipe 22.

  The valve device 23 is of a type that opens and closes the valve by, for example, an electromagnetic actuator, hydraulic pressure, manual operation, and the like, and the flow path of the pipe 22 can be opened and closed by the valve that is opened and closed. .

  In the first embodiment, as shown in FIG. 1 (b), the wind turbine blade 4 side is directed upward, and the tower structure 2 is slightly inclined upward from the lower part toward the upper part. The fixed ballast 20 with respect to the buoyancy of the tower structure 2 is filled so that the nacelle 3 together with the windmill blade 4 is positioned above the sea surface without being in contact with the sea surface so that the offshore windmill 1A maintains a rollover state as a whole. The weight balance between the first ballast section 11 and the third ballast section 13 filled with the flowable ballast 21 is adjusted.

  The offshore installation operation of the offshore wind turbine 1A of the first embodiment configured as described above will be described below.

First, as shown in FIG. 1 (a), the tower structure 2, the nacelle 3, and the wind turbine blade 4 are assembled on land in advance, and the second ballast section 12 in the assembled offshore wind turbine 1A is in an empty or semi-mounted state. The third ballast compartment 13 is filled with a fluid ballast, and as shown in FIG. 5B, the offshore wind turbine 1A is floated on the ocean in a laid state and towed by a tow boat not shown to the installation sea area. To do.
When arriving at the installation sea area, the valve device 23 is opened to open the flow path of the pipe 22, and the flow in the third ballast section 13 as shown in FIGS. 2 (a) to 2 (c). The sex ballast 21 is moved into the second ballast section 12. In this way, by changing the balance state of the offshore wind turbine 1A, the offshore wind turbine 1A can be shifted from the rollover state to the upright state.
As shown in FIG. 3 (a), the offshore wind turbine 1A can be installed in a state where it is moored by a mooring chain 30 and floated at a predetermined location on the ocean, as shown in FIG. 3 (b). As shown, it can be installed on the sea floor (the same applies to the offshore wind turbine 1B described later).

<Description of effects>
According to the first embodiment, as shown in FIG. 1A, in addition to the first ballast section 11 in which the fixed ballast 20 is filled in the tower structure 2, the first ballast section 11 and As shown in FIG. 1 (b), a third ballast section 13 is provided above the second ballast section 12 between them and a fluidity ballast 21 is filled inside the third ballast section 13. Since the overturning state of the offshore wind turbine 1A is maintained on the ocean, it can be easily towed even if there is a shallow water depth before reaching the installation sea area.
Further, as shown in FIGS. 2A to 2C, the offshore wind turbine 1 </ b> A is brought into the upright state from the rollover state by moving the fluidity ballast 21 in the third ballast section 13 into the second ballast section 12. Therefore, the offshore wind turbine 1A can be installed on the ocean without using a large-scale facility such as a large crane ship.

Such an effect is obtained by providing the first ballast section 11, the second ballast section 12, and the third ballast section 13 inside the tower structure 2, and filling the inside of the third ballast section 13 with the flowable ballast 21. This can be achieved by a simple configuration such as moving the ballast 21 in the third ballast section 13 into the second ballast section 12 by opening the valve 23.
Moreover, since the movement of the fluid ballast 21 from the third ballast section 13 into the second ballast section 12 is a gravity movement, a pump or the like for moving the fluid ballast 21 is unnecessary, and the structure is simple. Can be achieved.

[Second Embodiment]
FIG. 4 is a view showing an offshore wind turbine according to the second embodiment of the present invention, and shows a structural explanatory diagram (a) and a state diagram (b) lying on the ocean. FIG. 5 is a diagram showing a transition from the overturning state of the offshore wind turbine to the upright state, and FIG. 6 is an explanatory diagram of draft adjustment of the offshore wind turbine. In the second embodiment, the same or similar parts as those of the first embodiment described above are designated by the same reference numerals in the drawings, and detailed description thereof is omitted. In the following, The description will focus on the parts specific to the second embodiment.

  As shown in FIG. 4A, in the offshore wind turbine 1B of the second embodiment, the tower structure 2 is located slightly above the water line in the upright state above the third ballast section 13. Thus, a fourth ballast section 14 is provided which is partitioned by partition plates 9 and 10, and a fluid ballast 24 is filled in the fourth ballast section 14. The fourth ballast section 14 corresponds to the “draft adjustment ballast chamber” of the present invention.

  In the second embodiment, as shown in FIG. 4 (b), the wind turbine blade 4 side is directed upward, and the tower structure 2 is slightly inclined upward from the lower part to the upper part. The fixed ballast 20 with respect to the buoyancy of the tower structure 2 was filled so that the nacelle 3 together with the windmill blade 4 was positioned above the sea surface without contacting the sea surface, and the offshore windmill 1B maintained a rollover state as a whole. The weight balance of the first ballast section 11, the third ballast section 13 filled with the flowable ballast 21, and the fourth ballast section 14 filled with the flowable ballast 24 is adjusted.

  The fourth ballast section 14 is provided with pipe opening / closing means for opening / closing a pipe connected to the outside. This pipe opening / closing means is constituted by a valve device 26 attached to a pipe 25 extending from the fourth ballast section 14 to the outside. The valve device 26 has the same structure as the valve device 23 described above.

  The offshore installation operation of the offshore wind turbine 1B according to the second embodiment configured as described above will be described below.

First, as shown in FIG. 4 (a), the tower structure 2, the nacelle 3, and the wind turbine blade 4 are assembled on land in advance, and the second ballast section 12 in the assembled offshore wind turbine 1B is in an empty or semi-mounted state. The third ballast section 13 and the fourth ballast section 14 are filled with fluid ballasts 21 and 24, respectively, so that the offshore wind turbine 1B is laid on the ocean as shown in FIG. Float and tow on a charter (not shown) up to the installation area.
When arriving at the installation sea area, the valve device 23 is opened to open the flow path of the pipe 22, and the flow in the third ballast section 13 as shown in FIGS. 5 (a) to (c). The sex ballast 21 is moved into the second ballast section 12. Thus, by changing the balance state of the offshore wind turbine 1B, the offshore wind turbine 1B can be installed on the ocean by shifting from the rollover state to the upright state.
After the offshore wind turbine 1B is upright, as shown in FIG. 6 (a), the valve device 26 is opened to open the flow path of the pipe 25, and the ballast in the fourth ballast section 14 is opened. Is discharged and the draft is adjusted as shown in FIG.

<Description of effects>
According to the second embodiment, in addition to the first ballast section 11 filled with the fixed ballast 20 in the tower structure 2, the second ballast section 12 is sandwiched between the first ballast section 11. A third ballast section 13 is provided above, and a fourth ballast section 14 is provided above the third ballast section 13 so as to be positioned slightly above the waterline in the upright state. By filling the ballast sections 14 with fluid ballasts 21 and 24 having fluidity, the overturning state of the offshore wind turbine 1B is maintained on the ocean. Therefore, in the same manner as in the first embodiment, Even if there is a place where the water depth is shallow, it can be towed easily.
In addition, since the offshore wind turbine 1B is shifted from the rollover state to the upright state by moving the fluidity ballast in the third ballast section 13 into the second ballast section 12, the large size is the same as in the first embodiment. The offshore wind turbine 1B can be installed offshore without using large-scale equipment such as a crane ship.
Further, the draft can be adjusted by discharging the fluidity ballast 24 in the fourth ballast section 14 after standing upright, and the mooring tension can be adjusted when mooring with a mooring chain or the like.

Such an operational effect is obtained by providing the first ballast section 11, the second ballast section 12, the third ballast section 13 and the fourth ballast section 14 inside the tower structure 2, and the third ballast section 13 and the fourth ballast section 14, respectively. The ballast compartment 14 is filled with fluid ballasts 21 and 24, and the ballast 21 in the third ballast compartment 13 is replaced with the second ballast compartment 12 by opening the valve device 23. It is possible to achieve this by an easy work process such as discharging the flowable ballast 24 in the fourth ballast section 14 to the outside by the valve opening operation of the valve device 26.
In addition, the movement of the fluid ballast 21 from the third ballast section 13 into the second ballast section 12 is a gravity movement, and the discharge of the fluid ballast 24 in the fourth ballast section 14 is a gravity drainage. A pump or the like for moving and discharging the flowable ballasts 21 and 24 is unnecessary, and the structure can be simplified.

  As mentioned above, although the tower type floating structure of this invention and its installation method were demonstrated based on several embodiment, this invention is not limited to the structure described in the said embodiment, and does not deviate from the meaning. The configuration can be changed as appropriate within the range.

For example, as shown in FIGS. 7A and 7B, in the offshore wind turbines 1A and 1B of the above embodiments, the inside of the third ballast section 13 in the tower structure 2 is arranged on the side where the wind turbine blades 4 are provided. In the case of the front side, a partition plate 27 is provided to partition the offshore wind turbines 1A and 1B in the front-rear direction, and the rear divided ballast compartment 13a and the rear divided ballast compartment 13b are separated by the addition of the partition plate 27 You may make it fill the fluidity ballast 21 to the side division | segmentation ballast division 13b. Thus, as shown in FIGS. 4A and 4B, when the offshore wind turbines 1A and 1B are laid down on the ocean, the flowable ballast 21 in the rear divided ballast section 13b is disposed on the lower side. Therefore, the offshore wind turbines 1A and 1B are stabilized, and the rolling of the offshore wind turbines 1A and 1B rolling in the longitudinal direction can be effectively prevented.
Moreover, in each said embodiment, the ballast compartment 11-14 is formed by partitioning the inside of the tower structure 2 with the partition plates 5-10, and the example which comprises a ballast chamber by this ballast compartment 11-14 is shown. However, the present invention is not limited to this, and instead of the ballast compartments 11 to 14, a separately manufactured tank may be provided so that the inside of the tank is used as a ballast chamber.

  The tower-type floating structure of the present invention and its installation method have characteristics that it can be easily installed on the water with a simple configuration without using a large-scale facility such as a large crane ship. In addition to being suitable for use in wind power generation equipment installed in the building, for example, it can also be used for use in bridge substructures, weather observation towers, transmission line towers, lighthouses, and the like.

1A, 1B Offshore wind turbine (tower type floating structure)
2 Tower structure 11 First ballast section 12 Second ballast section (lower ballast chamber)
13 Third ballast section (upper ballast chamber)
14 4th ballast section (draft adjustment ballast room)
20 Fixed ballast 21, 24 Flowable ballast

Claims (6)

A tower-type floating structure equipped with a cylindrical tower structure capable of generating buoyancy and installed on the water,
An upper ballast chamber that is vertically arranged inside the tower structure and a lower ballast chamber that is empty or semi-mounted inside are provided, and the upper ballast chamber and the lower ballast chamber are connected by a pipe line. In addition to connecting and opening and closing means for opening and closing the pipe, the ballast having fluidity is filled in the upper ballast chamber while the pipe opening and closing means is closed, so that the rollover state is maintained on the water. together so as to, by moving the operation to open and the upper ballast chamber ballast the conduit opening and closing means to said lower ballast chamber, is characterized in that so as to shift from the rollover state upright Tower type floating structure. A tower-type floating structure equipped with a cylindrical tower structure capable of generating buoyancy and installed on the water,
An upper ballast chamber and a lower ballast chamber that are arranged vertically are provided inside the tower structure, respectively, and a draft adjustment ballast chamber is provided so as to be positioned near the draft line in an upright state above the upper ballast chamber, by filling the ballast with a respective internal on the flowability of the upper ballast chamber and the draft adjusting ballast chamber, as well as to hold the roll state on the water, the upper ballast chamber ballast to the lower ballast chamber A tower-type floating structure characterized in that, by moving, a transition is made from a rollover state to an upright state, and the draft is adjusted by discharging the ballast in the draft adjustment ballast chamber after the upright state. The tower-type floating structure according to claim 1 or 2, wherein the ballast is moved from the upper ballast chamber to the lower ballast chamber by gravity.   The tower-type floating structure according to claim 2, wherein discharge of the ballast in the draft adjustment ballast chamber is gravity drainage. It is the installation method of the tower type floating structure of Claim 1, Comprising:
Towing the tower-type floating structure to the installation water area in a rollover state;
A step of shifting to an upright state by moving the upper ballast chamber ballast in the tower water structure in the lower ballast chamber said tower water structure from rollover state at the installation waters,
The installation method of the tower type floating structure characterized by including. It is the installation method of the tower type floating structure of Claim 2, Comprising:
Towing the tower-type floating structure to the installation water area in a rollover state;
A step of shifting to an upright state by moving the upper ballast chamber ballast in the tower water structure in the lower ballast chamber said tower water structure from rollover state at the installation waters,
And adjusting the draft of the tower water structure by discharging the draft adjusting ballast chamber ballast after an upright of the tower water structure,
The installation method of the tower type floating structure characterized by including.

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