Box-shaped floating structure

Abstract

To provide a box-shaped floating body capable of suppressing oscillation caused by waves to stably float when staying on a water surface and smoothly moving when moving on the water surface.SOLUTION: A non-self-navigation type box-shaped floating body 10 comprises: a floating body 12; and oscillation reduction means 14 provided on the lateral side of the floating body 12 to reduce oscillation caused by waves. The oscillation reduction means 14 is provided with an oscillation suppression plate 16 erected with an opening 22 in an upper part, and lifting means 18 for lifting the oscillation suppression plate 16. When staying on a water surface, the oscillation suppression plate 16 holds a state where it is lowered until the opening 22 in the upper part is positioned in water. When moving on the water surface, the oscillation suppression plate 16 holds a state where it is raised above a bottom of the floating body 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a non-self-propelled box-type floating body. [Background technology]

[0002] Conventionally, non-self-propelled box-shaped floating bodies (barges) have been used as work vessels on water such as oceans, lakes, rivers, etc. Also, various floating bodies equipped with a rocking reduction means for suppressing the rocking of the floating body due to waves have been proposed (for example, see Patent Document 1).

[0003] Conventional non-self-propelled box-type floaters have a working limit wave height of around 0.5 m, and most of them are used in port areas and coastal areas, but they have the problem of being difficult to use in the open ocean, where wave heights exceeding the working limit wave height occur frequently. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-029065 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been an increasing demand for work in the open ocean, such as the construction of offshore facilities like offshore wind power plants, and there is a need for box-type floaters that can float stably during work (when stationed on the water surface).However, the box-type floaters must also be transported to the open ocean, and they must be able to travel smoothly to distant locations in the open ocean.

[0006] The object of the present invention is to provide a box-shaped floating body that can float stably while suppressing rocking caused by waves when moored on the water surface, and can move smoothly when moving on the water surface. [Means for solving the problem]

[0007] As a result of intensive research into solving the above problems, the inventor discovered that the above problems could be solved by providing a rocking reduction means on the side of the floating body body, which comprises an upright rocking suppression plate with an opening at the top and a lifting means for raising and lowering the rocking suppression plate, and thus completed the present invention.

[0008] That is, the present invention is as follows. [1] A non-self-propelled box-shaped floating body comprising a floating body body and a rolling reduction means provided on the side of the floating body body to suppress rolling caused by waves, The sway reduction means The apparatus comprises a standing vibration suppression plate having an opening at the top, and a lifting means for lifting and lowering the vibration suppression plate, A box-shaped floating body characterized in that, when the floating body is stopped on the water surface, the rocking suppression plate remains lowered until the upper opening is located underwater, and, when the floating body is moving on the water surface, the rocking suppression plate remains raised above the bottom of the floating body main body. [2] The box-shaped floating structure described in [1] above, characterized in that it is provided with a box-shaped rocking suppression plate storage section for storing the rocking suppression plate in the raised state. [3] The box-shaped floating body described in [2] above, characterized in that the rocking reduction means is composed of a plurality of units connected together, each unit comprising the rocking suppression plate and the box-shaped rocking suppression plate storage section.

[0009] [4] The box-type floating structure according to any one of [1] to [3] above, wherein the lifting means lifts and lowers the rocking suppression plates of each unit independently. [5] The floating body is approximately rectangular in plan view, The box-type floating body according to any one of the above [1] to [4], characterized in that the rocking reduction means are provided on both sides of the floating body in the longitudinal direction. [6] The unit is: The box-shaped rocking suppression plate storage section includes a storage chamber partitioned by a partition wall and an outer wall, and a lift rail extending vertically within the storage chamber, The sway suppression plate comprises a sway suppression board with a bottom plate of a size corresponding to the storage chamber, and a sliding member attached to the sway suppression board that extends in the vertical direction and is guided by the lift rail. The box-type floating structure according to any one of [3] to [5] above, characterized in that [Effects of the Invention]

[0010] The box-shaped floating body of the present invention can float stably while restraining rocking caused by waves when moored on the water surface, and can move smoothly when moving on the water surface. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic perspective view of a box-type floating body according to a first embodiment of the present invention, and is an explanatory view showing the state of the floating body moored on the water surface.

[0023] FIG. [Figure 2] 2A and 2B are explanatory diagrams of the box-shaped floating body shown in FIG. 1, where (a) shows a cross-sectional view and (b) shows a partially enlarged cross-sectional view. [Figure 3] 2 is an enlarged plan view of a unit of the rocking reduction means of the box-shaped floating body shown in FIG. 1, showing a state in which a rocking suppression plate is stored in a box-shaped rocking suppression plate storage section. FIG. [Figure 4] FIG. 2 is a perspective view of a rocking suppressing plate of the rocking reducing means of the box-shaped floating body shown in FIG. [Figure 5] 2A and 2B are explanatory diagrams of the lifting means of the rocking reduction means of the box-shaped floating body shown in FIG. 1, where (a) shows the rocking suppression plate in a lowered state, and (b) shows the rocking suppression plate in a raised state. [Figure 6] FIG. 2 is a schematic perspective view of the box-type floating body shown in FIG. 1, and is an explanatory view showing how it moves on the water surface. [Figure 7] 2A and 2B are explanatory diagrams of the behavior of the box-shaped floating body shown in FIG. 1 when it is swaying due to waves, where (a) shows a state where it is not swaying sideways, (b) shows a state where it is swaying sideways in a clockwise direction, and (c) shows a state where it is swaying sideways in a counterclockwise direction. [Figure 8] This is an explanatory diagram of a box-shaped ship (box-shaped floating structure) based on an actual ship, where (a) is a plan view and (b) is a side view seen from the short side. [Figure 9] 5A and 5B are photographs showing the downward movement of the rocking suppression plate of the box-shaped floating body according to Example 1, where (a) is a diagonally downward photograph and (b) is a side photograph. [Figure 10] 5A and 5B are photographs showing the state in which the rocking suppression plates of the box-type floating body according to Example 1 are stored, where (a) is a photograph taken obliquely from above, and (b) is a photograph taken obliquely from behind. [Figure 11] Photographs showing a conventional box-shaped floating body produced in the example, where (a) is a diagonal photograph taken from above, and (b) is a plan photograph. [Figure 12] FIG. 1 is an explanatory diagram showing an outline of a swing characteristic test. [Figure 13] FIG. 10 is a diagram showing the results of measuring the rolling characteristics of the box-shaped floating body produced in the example in regular waves. [Figure 14] FIG. 10 is a diagram showing the results of measuring the rolling characteristics of the box-shaped floating body produced in the example in irregular waves. DETAILED DESCRIPTION OF THE INVENTION

[0012] The box-type float of the present invention is a non-self-propelled box-type float comprising a float body and a rocking reduction means provided on the side of the float body to suppress rocking caused by waves, wherein the rocking reduction means comprises a rocking suppression plate that is erected and has an opening at the top, and a lifting means for raising and lowering the rocking suppression plate, and when moored on the water surface, the rocking suppression plate remains lowered until the opening at the top is located underwater, and when moving on the water surface, the rocking suppression plate remains raised above the bottom of the float body. Note that "mooring" in this invention also includes moving at a slow speed of 2 km / h or less.

[0013] In this specification, the movement of a box-shaped float around a vertical axis (longitudinal direction) passing through the center of gravity of the box-shaped float is referred to as pitching (swaying in the pitch direction), and the movement of a floating structure around a horizontal axis (transverse direction) passing through the center of gravity of the box-shaped float is referred to as lateral swaying (swaying in the roll direction) (see Figure 1).

[0014] When the box-shaped float of the present invention is moored on the water surface, the rocking suppression plate with an opening at the top remains lowered until the opening is underwater. Therefore, when waves cause the box-shaped float to rock, the fluid below the float body sandwiched between the rocking suppression plates flows out from the upper opening of the rocking suppression plate on the side below the rocking. This outflow generates a damping force in the direction of reducing the rocking, thereby suppressing the rocking of the box-shaped float. On the other hand, when the box-type floating body of the present invention moves on the water surface (when being pushed or towed), the rocking suppression plate remains raised above the bottom of the floating body main body, so that the box-type floating body can move smoothly without the rocking suppression plate acting as resistance.

[0015] The box-type floating structure of the present invention is a box-shaped structure that floats on water that cannot be navigated by itself, and is usually moved on the water surface by being pushed by a pushboat or towed by a tugboat. It can be used on water bodies such as the ocean, lakes, and rivers, preferably the ocean. Examples of the ocean include port areas, coastal areas, and the open ocean. The box-type floating structure of the present invention can be used as a work vessel such as a barge used for various marine operations. Specific examples of marine operations include seabed drilling surveys, dredging, mound formation, scouring prevention, installation of fishing reefs, transportation of equipment and repair parts for marine facilities, maintenance and repair of marine facilities, and undersea cable laying.

[0016] The box-type float of the present invention may be a jack-up type box-type float that is lifted from the water surface during work. Such a jack-up type box-type float does not sway during work, but before jacking up, the box-type float is in a floating state, and the swaying of the box-type float at that time can be suppressed. The box-type floating body of the present invention is not limited to one manufactured from scratch, but may be one manufactured by attaching a rolling reduction means to an existing floating body (barge, etc.).

[0017] As mentioned above, when the box-type float of the present invention is in operation (moored on the water surface), it includes not only when the box-type float is completely stationary, but also when it is moving at a slow speed of 2 km / h or less. In this case, the moving speed of the box-type float is preferably 1.5 km / h or less. An example of a box-type float that performs such operations is a submarine cable-laying box-type float that is pushed or towed at about 1 km / h while laying a submarine cable on the seabed.

[0018] [Floating body] The float body of the present invention is a main part constituting the box-type float and is a box-shaped structure. The shape of the float body is not particularly limited as long as it is a box-shaped shape that can float on the water surface, and examples include a substantially square or rectangular shape in plan view. Note that the bottom of either side of the float body where the rocking reduction means is not provided may be cut up.

[0019] The size of the floating body, which is approximately rectangular in plan view, is not particularly limited, but may be, for example, 50 to 100 m in length in the longitudinal direction and 15 to 30 m in length in the transverse direction. Note that, for example, a crane, living quarters, work machinery, etc. are mounted on the upper surface of the floating body.

[0020] [Sway reduction means] The rocking reduction means is a means for suppressing rocking caused by waves, provided on the side of the floating body, and comprises an upright rocking suppression plate with an opening at the top, and a lifting means for raising and lowering the rocking suppression plate. When the box-shaped float is moored on the water surface, the rocking suppression plate remains lowered until the opening at the top is located underwater, and when the box-shaped float moves on the water surface (when being pushed or towed), the rocking suppression plate remains raised above the bottom of the floating body.

[0021] The rocking reduction means are usually provided on opposite sides of the floating body. Furthermore, when the floating body is generally rectangular in plan view, it is preferable that they are provided on the longitudinal sides. That is, it is preferable that the box-type floating body of the present invention has a floating body that is generally rectangular in plan view, and that the rocking reduction means are provided on both longitudinal sides of the floating body. This makes it possible to reduce and suppress rolling caused by waves, which is larger than vertical rolling. Note that the rocking reduction means may be provided on all sides of the floating body.

[0022] (Sway suppression plate) The rocking suppression plate is an upright plate-like member with an opening at the top. When the rocking suppression plate is lowered until the upper opening is underwater, it can suppress rocking, allowing the float to float stably. Specifically, when the box-shaped floater is lowered until the upper opening is underwater, and the box-shaped floater rolls clockwise with its short side facing forward, water trapped below the floater body sandwiched between the rocking suppression plates flows out forcefully from the opening of the rocking suppression plate on the side below the rocking, providing a damping force for the roll and suppressing the rocking (see Figure 7(b)). Similarly, when the box-shaped floater rolls counterclockwise with its short side facing forward, water trapped below the floater body sandwiched between the rocking suppression plates flows out forcefully from the opening of the rocking suppression plate on the side below the rocking, providing a damping force for the roll and suppressing the rocking (see Figure 7(c)).

[0023] The rocking suppression plate can be appropriately set according to the size of the floating body, and its width and height are preferably formed to be close to the width and height of the side of the floating body to be installed. For example, the width (long side) is preferably 10 to 200 m and the height (short side) is preferably 1 to 20 m, more preferably the width (long side) is 20 to 150 m and the height (short side) is 2 to 15 m, and even more preferably the width (long side) is 30 to 100 m and the height (short side) is 3 to 10 m. The rocking suppression plate may be a divided body composed of a plurality of plate-like members.

[0024] The openings are preferably located in the upper 1 / 3 of the entire rocking suppression plate, more preferably in the upper 1 / 4, and even more preferably in the upper 1 / 5. The shape of the openings is not particularly limited, and examples include circular, elliptical, and polygonal shapes. The openings are preferably located continuously or intermittently across the width of the rocking suppression plate. The height of the openings (vertical length) can be set appropriately depending on the size of the floating body, etc., but is preferably 0.01 to 0.8 m, more preferably 0.03 to 0.6 m, and even more preferably 0.05 to 0.4 m.

[0025] (Lifting means) The lifting means is a means for raising and lowering the rocking suppression plate. This allows the rocking suppression plate to be lowered until its upper opening is underwater, and also allows it to be raised above the bottom of the floating body. The driving method of the lifting means is not particularly limited, and examples include methods using a winch, hydraulic cylinder, pneumatic cylinder, electric motor, gearbox, etc.

[0026] (Box-shaped vibration suppression plate storage section) The rocking reduction means may be provided in an exposed state on the side of the floating body, but is preferably provided in a surrounded and covered state on the side of the floating body. That is, the box-type float of the present invention is preferably provided with a box-shaped rocking suppression plate storage section that stores the rocking suppression plate in a raised state. This makes it possible to protect the rocking reduction means when docking at a quay or land, or when being pushed or towed by another ship. The box-shaped anti-sway plate storage section is arranged so that its lower end does not protrude from the underside of the floating body, thereby reducing resistance during movement and enabling smooth movement.

[0027] (unit) The sway reduction means is preferably configured by a series of multiple units each equipped with a sway suppression plate and a box-shaped sway suppression plate storage section. In this configuration, the lifting means may lift and lower the sway suppression plates of each unit simultaneously, or may lift and lower the sway suppression plates of each unit independently. This allows even a small lifting means to reliably lift and lower the plates. Furthermore, even if a malfunction occurs, repairing only some of the units is sufficient, preventing the entire sway reduction means from becoming inoperable. Furthermore, when the sway suppression plates of each unit are lifted and lowered independently, adjustments can be made, such as lowering the sway suppression plates at positions corresponding to the direction of incoming waves, allowing the boat to stay more stably on the water surface.

[0028] Specific preferred embodiments of the box-shaped sway suppression plate storage section and sway suppression plate in the above-mentioned unit include, for example, a box-shaped sway suppression plate storage section including a storage chamber separated by a partition wall and an outer wall, and a lift rail extending vertically within the storage chamber, and a sway suppression plate including a sway suppression board with a bottom plate sized to fit the storage chamber, and a sliding member attached to the sway suppression board and extending vertically and guided by the lift rail. Note that multiple lift rails may be provided. The lift rail and the sliding member may include rolling members such as rollers or rollers. By including a bottom plate sized to fit the storage chamber in the sway suppression plate, it is possible to prevent seawater and foreign matter from entering the storage chamber. Furthermore, it is preferable that the sway suppression board of the sway suppression plate include a ceiling plate sized to fit the storage chamber. This prevents water from flowing into the box-shaped sway suppression plate storage section when the sway suppression plate is lowered, and allows more water to be guided into the opening of the sway suppression plate (sway suppression board), thereby increasing the damping force against sway.

[0029] Hereinafter, one embodiment of the box-type floating body of the present invention will be specifically described with reference to the drawings, but the present invention is not limited to this embodiment.

[0030] Here, FIG. 1 is a schematic perspective view of a box-type float according to a first embodiment of the present invention, and is an explanatory diagram showing the state of the float moored on the water surface. FIG. 2 is an explanatory diagram of the box-type float shown in FIG. 1, where (a) is a cross-sectional view and (b) is a partially enlarged cross-sectional view. FIG. 3 is an enlarged plan view of a unit of the rocking reduction means of the box-type float shown in FIG. 1, showing a state in which the rocking suppression plate is stored in the box-shaped rocking suppression plate storage section. FIG. 4 is a perspective view of a rocking suppression plate of the rocking reduction means of the box-type float shown in FIG. 1. FIG. 5 is an explanatory diagram of the lifting means of the rocking reduction means of the box-type float shown in FIG. 1, where (a) shows a state in which the rocking suppression plate is lowered and (b) shows a state in which the rocking suppression plate is raised. FIG. 6 is a schematic perspective view of the box-type float shown in FIG. 1, and is an explanatory diagram showing the state in which the box-type float is moving on the water surface. Figure 7 is an explanatory diagram of the behavior of the box-shaped floating body shown in Figure 1 when it is swaying due to waves, where (a) shows a state where it is not swaying sideways, (b) shows a state where it is swaying sideways in a clockwise direction, and (c) shows a state where it is swaying sideways in a counterclockwise direction.

[0031] As shown in Figure 1, a box-shaped floating body 10 according to the first embodiment of the present invention comprises a floating body main body 12 and a rocking reduction means 14 provided on the longitudinal side of the floating body main body 12. The rocking reduction means 14 comprises a rocking suppression plate 16 provided in an upright position on the side of the floating body main body 12, and a hydraulic cylinder 18 as a lifting means for raising and lowering the rocking suppression plate 16.

[0032] As shown in Fig. 2, the box-shaped floating body 10 is provided with a box-shaped rocking suppression plate storage section 20 that stores the rocking suppression plates 16a, 16b in a raised state. Fig. 2 shows the rocking suppression plate 16a on one side (the right side) of the floating body main body 12 lowered until the upper opening 22 is located underwater, and the rocking suppression plate 16b on the other side (the left side) raised above the bottom of the floating body main body 12 and stored in the box-shaped rocking suppression plate storage section 20, but normally both are in the same raised or lowered state.

[0033] As shown in Fig. 1, the rocking reduction means 14 is configured by a series of five units 24 each including a rocking suppression plate 16 and a box-shaped rocking suppression plate storage section 20. As shown in Fig. 3, the box-shaped rocking suppression plate storage section 20 includes a storage chamber 30 separated for each unit 24 by a bulkhead 26 and an outer wall 28, and a lifting rail 32 provided in the storage chamber 30, and the raised rocking suppression plate 16 is stored in an enclosed state in the storage chamber 30. This allows the rocking reduction means 14 to be protected when docking at a quay or land, or when being pushed or towed by another ship.

[0034] 4, the sway suppression plate 16 includes a sway suppression board 34 that is 9 m wide (length in the left-right direction) and 5 m high (length in the up-down direction), and a sliding member 36 that is attached to the sway suppression board 34 and extends in the up-down direction. The sway suppression board 34 is configured in a box shape, surrounded by two side plates 38, a bottom plate 40, and a ceiling plate 42. The box-shaped sway suppression plate storage section 20 and the sway suppression plate 16 of one unit 24 are connected such that the sliding member 36 of the sway suppression plate 16 can slide on an elevation rail 32 provided in the storage chamber 30 of the box-shaped sway suppression plate storage section 20. In addition, three openings 22, each 1.5 m wide (length in the left-right direction) and 0.3 m high (length in the up-down direction), are provided intermittently at a predetermined interval across the width of the sway suppression plate 16 at its top.

[0035] 5, a hydraulic cylinder 18 is fixed to the sway suppression board 34 of the sway suppression plate 16 of each unit 24, and the sway suppression plate 16 is raised and lowered by the extension and contraction of this hydraulic cylinder 18. The hydraulic cylinder 18 can raise and lower the sway suppression plate 16 of each unit 24 independently.

[0036] As shown in Figure 6, when the box-shaped floating body 10 moves on the water surface (when being pushed or towed), the rocking suppression plates 16a, 16b rise above the bottom of the floating body main body 12 and are stored in the box-shaped rocking suppression plate storage section 20. The box-shaped rocking suppression plate storage section 20 is arranged so that its lower end does not protrude from the underside of the floating body main body 12. This reduces resistance caused by protrusions and gaps during movement, allowing for smooth movement on the water surface.

[0037] Next, the operation of the box-type floating body 10 according to the first embodiment of the present invention will be described with reference to Fig. 7. Fig. 7 shows the box-type floating body 10 in a state where the rocking suppression plates 16a and 16b provided on both sides of the floating body main body 12 have been lowered until the upper opening 22 is positioned underwater. First, as shown in Figure 7(a), when the box-shaped floating body 10 is not swaying sideways, the sway reduction means 14 keeps the sway suppression plates 16a, 16b in a lowered position until the upper opening 22 is positioned underwater, and the floating body remains stationary on the water surface. As shown in Figure 7(b), when the box-type floating body 10 rolls clockwise, the fluid below the floating body main body 12 sandwiched between the rolling suppression plates 16a and 16b flows out from the upper opening 22 of the rolling suppression plate 16a on the side below the rolling. This outflow generates a damping force in the direction to reduce the rolling, and the rolling of the box-type floating body 10 is suppressed. As shown in Figure 7(c), when the box-type floating body 10 rolls counterclockwise, the fluid below the floating body main body 12 sandwiched between the rolling suppression plates 16a and 16b flows out from the upper opening 22 of the rolling suppression plate 16b on the lower side of the rolling. This outflow generates a damping force in the direction of reducing the rolling, and the rolling of the box-type floating body 10 is suppressed. [Example]

[0038] [Oscillation characteristic test] Example 1 A rolling characteristic test was carried out using the box-type floating structure according to Example 1 of the present invention. Fig. 8 is an explanatory diagram of a box-shaped ship (box-shaped floating body) simulating an actual vessel, where (a) is a plan view and (b) is a side view seen from the short side. Fig. 9 is a photograph showing the roll suppression plate of the box-shaped floating body according to Example 1 when it is lowered, where (a) is a diagonally downward photograph and (b) is a side photograph. Fig. 10 is a photograph showing the roll suppression plate of the box-shaped floating body according to Example 1 when it is stored, where (a) is a diagonally upward photograph and (b) is a diagonally rearward photograph. Fig. 11 is a photograph showing a conventional box-shaped floating body produced in the example, where (a) is a diagonally upward photograph and (b) is a plan view. The box-type floating bodies used in this test (Example 1, Comparative Example 1) were assumed to be 1 / 50 scale models of the actual vessel.

[0039] As shown in Figure 8, the box-shaped ship modeled after the actual ship has a length (L) of 65.0 m, a width (B) of 25.0 m, a depth (D) of 5.0 m, a draft of 3.0 m, and a displacement of 4,997 tons. The box-shaped anti-rolling plate storage section is made up of eight units connected together on each side of the length of the box-shaped ship, with the length (l) of one unit being 6.3 m and the width (w) being 1.5 m, the length (d) from the bottom of the box-shaped anti-rolling plate storage section (the main floating body) when the anti-rolling plates are lowered being 2.5 m, the width (b) of the bottom plate of the anti-rolling plates being 1.0 m, and the height (g) of the opening being 0.25 m. Table 1 shows the box-shaped ship that was modeled after the actual ship and the scale of the model used.

[0040] [Table 1]

[0041] The oscillation characteristic test was carried out under the following conditions. As shown in Figure 12, in a marine test tank with a length of 60 m, a width of 4 m, and a depth of 2.3 m, a motion sensor was attached to the top of the box-shaped float of this example, and it was moored so as not to affect its motion. Waves were generated by a wave-making device, and the pitch amplitude / wave amplitude (deg / m) of the floating structure in wave period (sec) was measured. Measurements were taken in two patterns: regular waves and irregular waves.

[0042] The results are shown in Figures 13 and 14. As shown in Figures 13 and 14, it was confirmed that the box-shaped floating body of Example 1 can reduce rolling caused by regular waves and irregular waves by approximately 40 to 60% in the mean period of around 5 to 7 seconds, where waves frequently occur, compared to the box-shaped floating body of Comparative Example 1, which is not equipped with a rolling reduction means. Therefore, it was confirmed that the box-type floating body according to Example 1 of the present invention can suppress rocking caused by waves and float stably.

[0043] [Towing test] A towing test was conducted using the box-type floating body according to Example 1 of the present invention. It was confirmed that the box-shaped floating body of Example 1 (Figure 10) with the rocking suppression plate stored can be towed as smoothly as the box-shaped floating body of Comparative Example 1 (Figure 11) which is not equipped with a rocking reduction means. [Industrial Applicability]

[0044] The floating structure of the present invention can be used as a non-self-propelled work vessel at sea, and is therefore industrially useful. [Explanation of symbols]

[0045] 10 Box-shaped floating body 12 Floating body 14. Means for reducing vibration 16. Sway suppression plate 18 Hydraulic cylinder (lifting means) 20 Box-shaped vibration suppression plate storage section 22 Aperture 24 units 26 Bulkhead 28 Exterior Wall 30 Storage Room 32 Lifting rail 34 Swing Suppression Board 36 Sliding member 38 Side Panel 40 Bottom plate 42 Ceiling Panel

Claims

1. A non-self-propelled box-type floating body comprising a floating body main body and a rolling reduction means provided on a side of the floating body main body for suppressing rolling caused by waves, The sway reduction means The apparatus comprises an upright vibration suppression plate and a lifting means for lifting and lowering the vibration suppression plate, A box-shaped floating body characterized in that an opening is provided at the top of the rocking suppression plate, penetrating the rocking suppression plate in the plate thickness direction, and when the floating body is stopped on the water surface, the upright rocking suppression plate remains lowered until the opening is positioned underwater, and when the floating body is moving on the water surface, the upright rocking suppression plate remains raised above the bottom of the floating body main body.

2. 2. The box-shaped floating structure according to claim 1, further comprising a box-shaped rocking suppression plate storage section for storing the rocking suppression plate in the raised state.

3. 3. The box-shaped floating structure according to claim 2, wherein the rocking reduction means is configured by a series of a plurality of units each including the rocking suppression plate and the box-shaped rocking suppression plate storage section.

4. 4. The box-type floating structure according to claim 3, wherein the lifting means lifts and lowers the rocking suppression plates of the plurality of units independently.

5. The floating body is generally rectangular in plan view, 5. The box-shaped floating body according to claim 1, wherein the rocking reduction means is provided on both sides of the floating body in the longitudinal direction.

6. The unit comprises: The box-shaped sway suppression plate storage section includes a storage chamber partitioned by a partition wall and an outer wall, and an elevation rail extending vertically within the storage chamber, The sway suppression plate comprises a sway suppression board with a bottom plate of a size corresponding to the storage chamber, and a sliding member attached to the sway suppression board that extends in the vertical direction and is guided by the lift rail.

5. The box-shaped floating structure according to claim 3 or 4.

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