WO2005080189A1

WO2005080189A1 - Device for reducing motion of marine structure

Info

Publication number: WO2005080189A1
Application number: PCT/JP2005/002549
Authority: WO
Inventors: Makoto Nishigaki; Masami Matsuura
Original assignee: Mitsubishi Heavy Industries, Ltd.
Priority date: 2004-02-24
Filing date: 2005-02-18
Publication date: 2005-09-01
Also published as: JPWO2005080189A1; CN100526153C; NO337078B1; ES2489520T3; NO20064302L; PT1719697E; EP1719697A4; EP1719697A1; CN1922072A; JP4388548B2; EP1719697B1

Abstract

[PROBLEMS] A device for sufficiently reducing motion of a marine structure. [MEANS FOR SOLVING PROBLEMS] A device for reducing motion of a marine structure has a hollow-cylindrical floating marine structure; overhanging structures installed at portions on the upper parts of side walls of the floating marine structure, the portions being separated from the lower ends, underneath the water surface, of the side walls; surrounding walls arranged at least below or above the overhanging structures; and circulation openings formed between the overhanging structures and the surrounding walls.

Description

Specification

Offshore structure motion reduction device

Technical field

The present invention relates to a spar-type or mono-column-type marine petroleum drilling base, floating body-type registrar, and an apparatus for reducing the fluctuation of a marine structure such as a hotel.

Background art

[0002] Conventionally, as shown in Fig. 22, a device for reducing the motion of a floating marine structure has been proposed.

As shown in FIG. 22, the lower hull 12 is composed of a disc and a cylindrical column 11 disposed above the lower hull 12, and an inner water compartment 13 is provided inside the column 11. The inner water compartment 13 communicates with external water through a water inlet 14 provided in the lower hull 12, and is oblique to the outer circumference of the above-mentioned lower sea, le 12 in the floating type offshore structure. Fins 18 are provided so as to spread downward, and the fins 18 are fixed to the lower hull 12 by pillars 19 so as to maintain a gap between the fin 18 and the outer peripheral portion of the lower hull 12. It is intended to reduce the agitation.

[0003] Patent Document 1: JP-A-6-56074

Disclosure of the invention

Problems to be solved by the invention

[0004] However, as a result of examining the conventional one, there is a problem that the effect of reducing the motion is hardly obtained.

The present invention has been proposed to solve the above-described problems, and has as its object to provide an apparatus for reducing the motion of a marine structure, which can sufficiently reduce the motion of the marine structure. Means for solving the problem

[0005] (1) An apparatus for reducing fluctuation of an offshore structure according to a first means is mounted above a cylindrical floating offshore structure and a lower end of a side wall of the floating offshore structure below the water surface. An overhang structure, an enclosure wall provided at least below or above the overhang structure, and a flow opening formed between the overhang structure and the enclosure wall. [0006] (2) Further, the apparatus for reducing sway of an offshore structure according to the second means includes a cylindrical floating offshore structure and a space above the lower end of the side wall of the floating offshore structure below the water surface. A projecting structure provided at a distance, an enclosing wall provided at least below or above the projecting structure, and a communicating portion formed between the projecting structure and the projecting structure. It is characterized by having.

[0007] (3) Further, the apparatus for reducing the motion of an offshore structure according to the third means is characterized in that the floating offshore structure has a cylindrical shape and an upper space separated from the lower end of the side wall of the floating offshore structure below the water surface. And a surrounding wall disposed below and above the overhanging structure, and surrounding the outer periphery of the overhanging structure and continuously disposed over the lower and upper surrounding walls. And a communication portion formed by the overhanging structure and the communication portion wall.

[0008] (4) The marine structure fluctuation reduction device according to the fourth means is characterized in that, in the first to third means, V, the overhanging structure, the enclosure, the wall and the floating marine structure. And at least six lateral movement preventing plates disposed in the vertical direction.

[0009] (5) In the marine structure fluctuation reducing device according to a fifth means, in the fourth means, the swelling structure, the surrounding wall, the floating marine structure, and the lateral movement preventing plate are provided. A seawater storage section is formed.

The invention's effect

[0010] The invention according to each claim described in the claims employs each means described in (1)-(5) above, and thus has the following effects.

(1) Since the invention according to claim 1 or 2 employs the first or second means, a seawater storage section is formed by the floating marine structure, the overhanging structure and the surrounding wall, and the floating marine structure is formed. When an object sways, the seawater remaining in the seawater storage section acts as a mass to suppress the sway, and the seawater in the seawater storage section spouts outward from the slit-shaped flow opening, resulting in floating. The sway of the offshore structure can be greatly suppressed.

[0011] (2) Since the invention according to claim 3 employs the third means, a seawater storage portion is formed by the floating marine structure, the overhanging structure, and the surrounding wall, and Upset In, the seawater retained in the seawater storage unit acts as a mass that suppresses the sway, and moves up and down through the communication unit, thereby greatly suppressing the sway of the floating marine structure.

[0012] (3) The invention according to claim 4 or 5 employs the fourth or fifth means, so that the lateral movement preventing plate is used to prevent seawater in the seawater storage unit from laterally moving. In addition, it is possible to more effectively suppress the movement of the floating marine structure.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing a configuration of a marine structure fluctuation reducing device according to a first embodiment of the present invention, and FIG. 2 is a bottom view of the first embodiment.

FIG. 2-21 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiments 2 to 20 of the present invention.

Example 1

First, the configuration of the marine structure fluctuation reducing device according to the first embodiment will be described based on FIG. 1 and FIG.

As shown in the figure, this floating marine structure is composed of a cylindrical floating marine structure 1 and a ring-shaped overhanging structure mounted above the side wall of the floating marine structure 1 at a distance from the lower end below the water surface. Object 2

[0015] The overhanging structure 2 is disposed around the entire circumference of the floating marine structure 1. Below the outer end of the overhanging structure 2, a ring-shaped enclosure wall 3a is similarly suspended. It is arranged so as to cover the entire circumference of the offshore structure 1 and not to protrude from the outer end of the overhanging structure 2! /, Between the overhanging structure 2 and the surrounding wall 3a, A slit-shaped flow opening 5a is formed. Between the overhanging structure 2, the surrounding wall 3a, and the lower outer wall of the floating marine structure 1, a lateral movement preventing plate 4a is provided in a vertical direction.

Six lateral movement prevention plates 4a are radially arranged around the floating marine structure 1.The open end 6a of the lateral movement prevention plate 4a is located at the lower end of the surrounding wall 3a. Then inside Is located at the lower end of the outer surface of the floating offshore structure 1.

[0016] The lower surface of the overhanging structure 2, the surrounding wall 3, the outer surface of the floating marine structure 1, and the lateral movement preventing plates 4a, 4a form a seawater storage section A for storing seawater.

The lateral movement preventing plate 4a is for preventing the seawater in the seawater storage section A from laterally moving when the floating marine structure 1 is shaken. Different forces require at least 6 or more as shown in Figure 2.

[0017] In the above-described configuration, a large amount of seawater is stored in each seawater storage section A, and when the floating marine structure 1 is shaken, the seawater remaining in the seawater storage section A fluctuates. Acts as a mass that suppresses

Furthermore, the seawater in the seawater storage section A is spouted outward from the slit-shaped flow opening 5a, thereby suppressing the fluctuation.

Further, it is desirable that the size of the circulation opening 5a is such that the seawater in the seawater storage section is ejected while generating a vortex when the floating marine structure 1 resonates and shakes. Example 2

Next, with reference to FIG. 3, a description will be given of a configuration of a device for reducing the fluctuation of a floating body according to a second embodiment.

In the apparatus for reducing the fluctuation of the floating body according to the second embodiment of the present invention, in the first embodiment (FIGS. 1 and 2), the surrounding wall 3a is disposed below the overhanging structure 2 while the surrounding wall 3b is provided. Is provided above the overhanging structure 2.

3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and points different from FIGS. 1 and 2 will be mainly described.

As shown in FIG. 3, above the outer end of the overhanging structure 2, a ring-shaped enclosure wall 3 b extends around the entire circumference of the floating marine structure 1 and at the outer end of the overhanging structure 2. A slit-shaped flow opening 5b is formed between the overhanging structure 2 and the surrounding wall 3b so as not to protrude.

Then, between the overhanging structure 2, the surrounding wall 3b, and the upper outer wall of the floating marine structure 1, a lateral movement preventing plate 4b is radially provided around the floating marine structure 1, at least as in FIG. Six of them are arranged vertically to form seawater storage section B.

The open end 6b of the lateral movement prevention plate 4b is located at the upper end of the enclosure wall 3a on the outside and floats on the inside. It is shaped to be located on the upper outer wall of the recreational structure 1. With the configuration described above, the same operation and effect as those of the first embodiment can be obtained.

Example 3

Referring to FIG. 4, a configuration of a device for reducing the motion of a floating body according to a third embodiment will be described.

In the apparatus for reducing the motion of a floating body according to the third embodiment of the present invention, the structure of the first embodiment (FIGS. 1 and 2) has the enclosure wall 3a vertically arranged below the overhanging structure 2, whereas the enclosure The wall 3c is disposed so as to be obliquely outward of the overhanging structure 2.

4, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and points different from those in FIGS. 1 and 2 will be mainly described.

As shown in FIG. 4, below the outer end of the overhanging structure 2, a frustoconical enclosure wall 3 c is provided around the entire circumference of the floating marine structure 1, and A slit-shaped flow opening 5c is formed between 2 and the surrounding wall 3c.

Then, between the overhanging structure 2, the surrounding wall 3c, and the lower outer wall of the floating marine structure 1, a lateral movement preventing plate 4c is radially provided around the floating marine structure 1, at least as in FIG. Six pieces are arranged vertically! / Puru.

The open end 6c of the lateral movement preventing plate 4c is shaped so that its outside is located at the lower end of the surrounding wall 3c and its inside is located at the lower end of the outer surface of the floating marine structure 1.

With the above-described configuration, a larger amount of seawater than in the first embodiment can be retained in the seawater storage section A, and the effect of suppressing sway is further improved.

Example 4

A configuration of a device for reducing the motion of a floating body according to a fourth embodiment will be described with reference to FIG.

In the apparatus for reducing the motion of a floating body according to the fourth embodiment of the present invention, in the first embodiment (FIGS. 1 and 2), the surrounding wall 3a is disposed below the overhanging structure 2 while the surrounding wall 3d is provided. Is provided outside the outer end of the overhanging structure 2.

5, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and points different from FIGS. 1 and 2 will be mainly described.

As shown in FIG. 5, below the outer end of the overhanging structure 2, a ring-shaped enclosure wall 3 d is provided around the entire circumference of the floating offshore structure 1, and Structure 2 and enclosure 3d Between them, a slit-shaped flow opening 5d is formed.

Then, between the overhanging structure 2, the surrounding wall 3d, and the lower outer wall of the floating marine structure 1, a lateral movement preventing plate 4d is provided radially around the floating marine structure 1, at least in the same manner as in FIG. Six pieces are arranged vertically! / Puru.

The open end 6d of the lateral movement preventing plate 4d is shaped so that its outside is located at the lower end of the surrounding wall 3d and its inside is located at the lower end of the outer surface of the floating marine structure 1.

Example 5

Referring to FIG. 6, a description will be given of a configuration of a device for reducing the motion of a floating body according to a fifth embodiment.

In the apparatus for reducing the motion of a floating body according to the fifth embodiment of the present invention, the enclosure of the fourth embodiment (FIG. 5) has the enclosure wall 3d disposed vertically, whereas the enclosure and the wall 3e are inclined obliquely outward. Arrange them. 6, the same components as those in FIG. 5 are denoted by the same reference numerals, and points different from FIG. 5 will be mainly described.

As shown in FIG. 6, below the outer end of the overhanging structure 2, a truncated cone-shaped surrounding wall 3 e is provided around the entire circumference of the floating offshore structure 1, and A slit-shaped flow opening 5e is formed between the structure 2 and the surrounding wall 3e.

Then, between the overhanging structure 2, the surrounding wall 3e, and the lower outer wall of the floating marine structure 1, a lateral movement preventing plate 4e is radiated around the floating marine structure 1 at least 6 times as in FIG. Arranged vertically! / Puru.

The open end 6e of the lateral movement preventing plate 4e has such a shape that its outside is located at the lower end of the surrounding wall 3e and its inside is located at the lower end of the outer surface of the floating marine structure 1.

With the above configuration, a larger amount of seawater can be retained in the seawater storage section A than in the fourth embodiment, and the effect of suppressing sway is further improved.

Example 6

Referring to FIG. 7, a description will be given of a configuration of a device for reducing the motion of a floating body according to a sixth embodiment.

In the device for reducing the motion of a floating body according to the sixth embodiment of the present invention, the device of the second embodiment (FIGS. 1, 2 and 3) is provided with the enclosure V, the wall 3a or the enclosure, and the wall 3b extended above or below the structure 2. And then, An enclosure wall 3a and the like and an enclosure wall 3b and the like are provided above and below the structure 2, respectively.

7, the same components as those in FIGS. 1, 2, and 3 are denoted by the same reference numerals. With the above configuration, a large amount of seawater can be retained in the seawater storage sections A and B, and the effect of suppressing the sway is further improved.

Example 7

Referring to FIG. 8, a description will be given of a configuration of a device for reducing the fluctuation of a floating body according to a seventh embodiment.

FIG. 8 shows a combination of the second embodiment and the third embodiment.

That is, an enclosure wall 3b and the like shown in FIG. 3 are disposed above the overhanging structure 2, and an enclosure and walls 3c and the like shown in FIG.

8, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals.

With the above configuration, a large amount of seawater can be retained in the seawater storage sections A and B, and the effect of suppressing the sway is further improved.

Example 8

[0028] Referring to Fig. 9, a description will be given of a configuration of a device for reducing the motion of a floating body according to an eighth embodiment.

In the device for reducing the sway of a floating body according to the eighth embodiment of the present invention, the device of the seventh embodiment (FIG. 8) has a structure in which the wall above the overhanging structure 2 and the wall 3b are arranged in the vertical direction. A frusto-conical frustum-shaped enclosure extending outward and a wall 3f is provided.

In FIG. 9, the same components as those in FIG. 8 are denoted by the same reference numerals.

[0029] That is, similarly to FIG. 8, a frustoconical enclosure wall 3c and the like are provided below the overhanging structure 2.

On the other hand, above the overhanging structure 2, an inverted truncated cone-shaped enclosure wall 3f is provided around the entire circumference of the floating marine structure 1, and between the overhanging structure 2 and the enclosure wall 3f, A slit-like flow opening 5f is formed.

Then, between the overhanging structure 2, the surrounding wall 3f, and the upper outer wall of the floating marine structure 1, a lateral movement preventing plate 4f is radiated around the floating marine structure 1 at least 6 times as in FIG. Seawater storage section B is formed in the vertical direction.

The open end 6f of the lateral movement prevention plate 4f is located at the upper end of the enclosure wall 3f on the outside and floats on the inside. It is shaped to be located on the upper outer wall of offshore structure 1.

Example 9

A configuration of a device for reducing the motion of a floating body according to a ninth embodiment will be described with reference to FIG.

FIG. 10 shows a combination of Example 2 (FIG. 3) and Example 4 (FIG. 5).

10, the same components as those in FIGS. 3 and 5 are denoted by the same reference numerals.

That is, the surrounding wall 3b and the like are provided above the overhanging structure 2 as in FIG. 3, and the surrounding and wall 3d and the like are provided below the overhanging structure 2 as in FIG.

Example 10

Referring to FIG. 11, a description will be given of a configuration of a device for reducing the motion of a floating body according to a tenth embodiment.

FIG. 11 shows a combination of Example 2 (FIG. 3) and Example 5 (FIG. 6).

11, the same components as those in FIGS. 3 and 6 are denoted by the same reference numerals.

That is, the surrounding wall 3b and the like are provided above the overhanging structure 2 as in FIG. 3, and the surrounding wall and the wall 3e are provided below the overhanging structure 2 as in FIG.

Example 11

Referring to FIG. 12, a description will be given of a configuration of a floating body fluctuation reducing device according to an eleventh embodiment.

In FIG. 12, the lower part of the overhang structure 2 in Example 8 (FIG. 9) is replaced with that of Example 5 (FIG. 6).

12, the same components as those in FIGS. 6 and 9 are denoted by the same reference numerals.

That is, the surrounding wall 3f and the like are provided above the overhanging structure 2 as in FIG. 9, and the surrounding wall and the wall 3e are provided below the same as in FIG.

With the above configuration, a large amount of seawater can be retained in the seawater storage sections A and B, and the effect of suppressing the sway is further improved. Example 12

Referring to FIG. 13, a description will be given of a configuration of a device for reducing the motion of a floating body according to a twelfth embodiment.

FIG. 13 shows an example in which the surrounding wall 3b above the overhanging structure 2 is further disposed outwardly from Example 9 (FIG. 10).

13, the same components as those in FIG. 10 are denoted by the same reference numerals.

That is, an enclosure wall 3d and the like are disposed below the overhanging structure 2 as in FIG.

On the other hand, above the overhanging structure 2, a ring-shaped enclosure wall 3g having the same size as the enclosure 3d is provided around the entire circumference of the floating marine structure 1, and the overhanging structure 2 Between the surrounding wall 3g, a slit-shaped circulation opening 5g is formed.

Then, between the overhanging structure 2, the surrounding wall 3g, and the upper outer wall of the floating marine structure 1, a lateral movement preventing plate 4g is radiated around the floating marine structure 1 at least 6 times as in FIG. Seawater storage section B is formed in the vertical direction. The open end 6g of the lateral movement prevention plate 4g has such a shape that the outside is located at the upper end of the surrounding wall 3g and the inside is located on the upper outer wall of the floating marine structure 1.

Example 13

With reference to FIG. 14, a description will be given of a configuration of a device for reducing the fluctuation of a floating body according to a thirteenth embodiment.

FIG. 14 shows a modification of the twelfth embodiment (FIG. 13) in which the surrounding wall 3d below the overhanging structure 2 is replaced with a surrounding wall 3e shown in FIG.

14, the same components as those in FIGS. 13 and 6 are denoted by the same reference numerals.

Example 14

With reference to FIG. 15, a description will be given of a configuration of a device for reducing the motion of a floating body according to a fourteenth embodiment.

The structure shown in FIG. 15 differs from that of Example 13 (FIG. 14) in that the surrounding wall 3g above the overhanging structure 2 is provided.

And an inverted frustoconical shape which extends obliquely outward and upward.

15, the same components as those in FIG. 14 are denoted by the same reference numerals. That is, an enclosing wall 3e is provided below the overhanging structure 2 as in FIG.

On the other hand, above the overhanging structure 2, an inverted truncated cone-shaped surrounding wall 3 h having the same size as the surrounding wall 3 e is provided, and a slit-like shape is provided between the overhanging structure 2 and the surrounding wall 3 h. 5h is formed.

Then, between the overhanging structure 2, the surrounding wall 3h, and the upper outer wall of the floating marine structure 1, a lateral movement preventing plate 4h is radiated around the floating marine structure 1 at least 6 times as in FIG. Seawater storage section B is formed in the vertical direction.

The open end 6h of the lateral movement prevention plate 4h is shaped such that its outside is located at the upper end of the surrounding wall 3h and its inside is located on the upper outer wall of the floating marine structure 1.

Example 15

Referring to FIG. 16, a description will be given of a configuration of a device for reducing motion of a floating body according to a fifteenth embodiment.

In Example 15, the overhanging structure 2 is directly attached to the floating offshore structure 1 in Embodiments 1 to 14, whereas in Example 15, the water surface of the side wall of the floating offshore structure 1 is provided. Above the lower end, a ring-shaped overhanging structure 2a is arranged at an interval from the floating marine structure 1.

A communication portion 7 is formed between the floating marine structure 1 and the overhanging structure 2a.

[0039] Further, on the upper surface or the lower surface of the overhanging structure 2a, the surrounding walls 3a, 3b, 3c, and 3f as shown in Figs. 1, 3, 4, 7, 8, and 9 are directly provided. Installed.

Further, lateral movement prevention plates 4a, 4b, 4c, and 4f are also provided, and seawater storage sections A or B are formed.

Also in the embodiment 15, the effect of suppressing the fluctuation is further improved.

Example 16

Referring to FIG. 17, the configuration of a device for reducing the motion of a floating body according to embodiment 16 will be described.

In FIG. 17, the communication part wall 9 surrounding the outer periphery of the overhanging structure 2 was provided in Example 12 (FIG. 13), and the communication part wall 9, the enclosure wall 3d, and the enclosure wall 3g were connected. Things. 17, the same components as those in FIG. 13 are denoted by the same reference numerals. That is, below the overhanging structure 2, the ring-shaped enclosure wall 3d is provided around the entire circumference of the floating marine structure 1, and a seawater storage section A is formed.

Above the overhang structure 2, a ring-shaped enclosure wall 3g of the same size as the enclosure wall 3d is arranged around the entire circumference of the floating marine structure 1, and a seawater storage section B is formed. .

Further, on the outer periphery of the overhanging structure 2, a communication portion wall 9 that is continuous with the surrounding wall 3d, the surrounding wall, and the wall 3g is provided.

A ring-shaped communication portion 7a that connects the seawater storage sections A and B is formed between the inside of the communication portion wall 9 and the outer periphery of the overhanging structure 2.

With the above configuration, when the marine structure 1 is shaken, the seawater retained in the seawater storage section A or B flows through the communication portion 7a into the seawater storage section B or A, and is thus shaken by the fluid resistance. Is further improved.

Example 17

With reference to FIG. 18, a description will be given of a configuration of a device for reducing the motion of a floating body according to a seventeenth embodiment.

18 is different from Example 14 (FIG. 15) in that a communicating wall 9 surrounding the outer periphery of the overhanging structure 2 is provided, and the communicating wall 9, the surrounding wall 3e, and the surrounding wall 3h are connected. Things.

18, the same components as those in FIG. 15 are denoted by the same reference numerals.

In other words, below the overhanging structure 2, a ring-shaped enclosure wall 3e is provided around the entire circumference of the floating marine structure 1, and a seawater storage section A is formed.

Above the overhanging structure 2, a ring-shaped surrounding wall 3h of the same size as the surrounding wall 3e is provided around the entire circumference of the floating marine structure 1, and a seawater storage section B is formed. .

Further, on the outer periphery of the overhanging structure 2, a communication portion wall 9 which is continuous with the wall 3e, the wall 3h, and the wall 3e is provided.

With the above-described configuration, when the marine structure 1 is shaken, the seawater retained in the seawater storage section A or B flows through the communication portion 7a into the seawater storage section B or A, and is shaken by the fluid resistance. Is further improved. Example 18

The configuration of the floating body fluctuation reducing device according to the eighteenth embodiment will be described based on FIG.

19 is different from Example 16 (FIG. 17) in that the outer periphery of the overhang structure 2 is projected outward to form an overhang structure 2b.

In FIG. 19, the same components as those in FIG. 17 are denoted by the same reference numerals.

That is, below the overhanging structure 2b, a ring-shaped enclosure wall 3d is provided over the entire circumference of the floating marine structure 1, and a seawater storage section A is formed.

Above the overhanging structure 2b, a ring-shaped enclosure having the same size as the wall 3d, and a wall 3g are disposed around the entire circumference of the floating marine structure 1, and a seawater storage section B is formed. I have.

Further, on the outer periphery of the overhanging structure 2b, a communication portion wall 9 which is continuous with the surrounding wall 3d, the surrounding wall, and the wall 3g is provided.

A ring-shaped communication portion 7b that connects the seawater storage sections A and B is formed between the inside of the communication portion wall 9 and the outer periphery of the overhanging structure 2b protruding outward.

Also, an orifice portion 10 is formed by the inside of the communication portion wall 9 and the outer periphery of the overhanging structure 2b that protrudes outmost.

With the above configuration, when the marine structure 1 is shaken, the seawater retained in the seawater storage section A or B flows through the communication section 7b into the seawater storage section B or A, and passes through the orifice section 10. In this case, since the damping effect increases as the flow velocity of the passing fluid increases, the effect of suppressing the fluctuation is further improved.

The orifice section 10 can be applied to the one having the structure shown in FIG.

Further, in the above-mentioned structure, in order to form the orifice portion 10, the central portion in the vertical direction of the overhang structure 2b protrudes to the outer peripheral side, but is not limited to this. The lower end may be configured to protrude toward the outer periphery, and furthermore, the communication portion wall 9 may be configured to protrude inward.

Example 19

Referring to FIG. 20, a description will be given of a configuration of a device for reducing the motion of a floating body according to a nineteenth embodiment.

The structure of the embodiment 19 is different from the structure of the embodiment 15 (FIG. 16) in that the inner wall of the overhang structure 2a is projected inward to form the overhang structure 2c. 20, the same components as those in FIG. 16 are denoted by the same reference numerals. As in the case of Example 15 (FIG. 16), a ring-shaped overhanging structure 2c is spaced apart from the floating marine structure 1 above and above the lower end of the side wall of the floating marine structure 1 below the water surface. It is arranged.

A communication portion 7c is formed between the floating marine structure 1 and the overhanging structure 2c.

Also, the vertical center of the inner wall of the overhang structure 2c protrudes inward, and the orifice portion 10 is formed by the outer wall of the floating marine structure 1 and the outermost protrusion of the overhang structure 2c.

[0048] Further, on the upper surface or the lower surface of the overhanging structure 2c, the surrounding walls 3a, 3b, 3c, 3f as shown in Figs. 1, 3, 4, 7, 8, and 9 are directly provided. Installed.

Also in the nineteenth embodiment, the effect of suppressing the fluctuation is further improved.

Example 20

Referring to FIG. 21, a description will be given of a configuration of a device for reducing the fluctuation of a floating body according to a twentieth embodiment.

The twentieth embodiment is different from the fifteenth embodiment (FIG. 16) in that the inner wall of the overhang structure 2a is protruded inward to form the overhang structure 2d.

21, the same components as those in FIG. 16 are denoted by the same reference numerals.

As in the case of Example 15 (FIG. 16), a ring-shaped overhanging structure 2d is spaced above the floating offshore structure 1 and separated from the lower end of the side wall of the floating offshore structure 1 below the water surface. It is arranged.

A communication portion 7d is formed between the floating marine structure 1 and the overhanging structure 2d.

Also, the upper portion of the inner wall of the overhang structure 2d protrudes inward, and the orifice portion 10 is formed by the outer wall of the floating marine structure 1 and the outermost protruding outer periphery of the overhang structure 2d.

[0050] Further, the upper surface or the lower surface of the overhanging structure 2d is shown in Figs. 1, 3, 4, 4, 7, 8, and 9. Such enclosures 3a, 3b, 3c, 3f are directly attached.

Also in the twentieth embodiment, the effect of suppressing the fluctuation is further improved.

FIG. 1 and FIG. 21 illustrate only the shape of the floating marine structure 1 below the water surface. The shape of the force floating structure 1 above the water surface is different from the shape below the water surface. It may be shaped. Further, a plurality of floating marine structures 1 shown in FIGS. 1 to 21 may be provided in parallel, and a common platform may be provided at a position distant from the sea surface to mount leisure facilities, hotels, and the like. .

[0052] As described above, Embodiments 1-120 of the embodiment of the present invention have been described. However, the present invention is not limited to the above-described embodiment, and various changes may be made to the specific structure within the scope of the present invention. In addition, it's not necessary! /.

For example, the cross-sectional shapes of the floating marine structure 1, the overhanging structures 2, 2a and the surrounding walls 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, and the communication section wall 9 are limited to circular ones. It can be various shapes such as polygons, octagons, squares, etc.

The overhanging structures 2, 2a, 2b, 2c, and 2d are not limited to those having a square cross section as shown in FIG. 121, but have a thin plate-like (disk-like or the like) structure. Things shall be included.

In each of the above-described embodiments, the surrounding walls 3a, 3c, 3d, and 3e provided below the overhanging structures 2 and 2a are arranged so as not to protrude from the lower surfaces of the overhanging structures 2 and 2a. The force is not limited to this, but may be a shape extending below the lower surfaces of the overhanging structures 2 and 2a.

In this case as well, the open ends 6a, 6c, 6d, 6e of the lateral movement prevention plates 4a, 4c, 4d, 4e are located outside at the lower ends of the surrounding walls 3a, 3c, 3d, 3e, and the inside is floating. The shape is such that it is located at the lower end of the outer surface of the offshore structure 1!

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 1 of the present invention.

FIG. 2 is a bottom view of Example 1.

FIG. 3 is a cross-sectional view showing a configuration of a marine structure fluctuation reducing device according to a second embodiment of the present invention. It is.

[4] FIG. 4 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 3 of the present invention.

FIG. 5 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 4 of the present invention.

FIG. 6 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 5 of the present invention.

FIG. 7 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 6 of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a marine structure fluctuation reducing device according to a seventh embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 8 of the present invention.

FIG. 10 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 9 of the present invention.

FIG. 11 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 10 of the present invention.

FIG. 12 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 11 of the present invention.

FIG. 13 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 12 of the present invention.

FIG. 14 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 13 of the present invention.

FIG. 15 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 14 of the present invention.

FIG. 16 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 15 of the present invention.

FIG. 17 is a cross-sectional view showing a configuration of an offshore structure fluctuation reducing apparatus according to Embodiment 16 of the present invention FIG.

FIG. 18 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 17 of the present invention.

FIG. 19 is a cross-sectional view showing a configuration of a marine structure fluctuation reducing device according to Embodiment 18 of the present invention.

FIG. 20 is a cross-sectional view showing a configuration of an apparatus for reducing motion of an offshore structure according to Embodiment 19 of the present invention.

FIG. 21 is a cross-sectional view showing a configuration of a marine structure fluctuation reduction device according to Embodiment 20 of the present invention.

FIG. 22 is a cross-sectional view showing the configuration of a conventional marine structure fluctuation reduction device.

Explanation of symbols

1 Floating offshore structures

2, 2a, 2b, 2c, 2d Overhanging structure

3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h Enclosure wall

4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h Horizontal movement prevention plate

5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h Flow opening

6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h Open end

7, 7a, 7b, 7c, 7d Communication section

9 Communication wall

10 Orifice section

A, B Seawater storage compartment

Claims

The scope of the claims

[1] A cylindrical floating offshore structure, an overhanging structure attached above the lower end of the side wall of the floating offshore structure below the water surface, and at least below or above the overhanging structure An oscillating structure for a marine structure, comprising: an enclosed wall; and a flow opening formed between the overhanging structure and the enclosed wall.

[2] A cylindrical floating offshore structure, an overhanging structure arranged at a distance above the lower end of the side wall of the floating offshore structure below the water surface, and at least a portion below the overhanging structure Alternatively, there is provided an marine structure fluctuation reduction device, comprising: an enclosure wall provided above; and a communication portion formed between the overhanging structure and the overhanging structure.

[3] A cylindrical floating offshore structure, an overhanging structure disposed above and spaced apart from a lower end of the side wall of the floating offshore structure below the water surface, and below and above the overhanging structure The overhanging wall, the communicating wall surrounding the outer periphery of the overhanging structure and being continuously connected to the lower and upper surrounding walls, and the overhanging structure and the communicating wall. And a communication portion formed by the marine structure.

[4] At least six lateral movement preventing plates disposed in a vertical direction between the overhanging structure and the enclosure, and between the wall and the floating offshore structure. 3. The apparatus for reducing sway of an offshore structure according to 3.

[5] The marine structure according to claim 4, wherein a seawater storage section is formed by the overhanging structure, the surrounding wall, the floating marine structure, and the lateral movement preventing plate. Motion reduction device.