JP4078006B2 - Wave-resistant large floating body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wave-resistant large-sized floating body that reduces a large floating structure (hereinafter referred to as a mega float) floating on the ocean, a floating pier, a floating warehouse, and the like from being shaken by an incident wave.
[0002]
[Prior art]
Development of a mega float floating on the ocean is underway. Megafloat, which has been considered in the past, is a box-shaped floating structure that creates a calm sea area with a fixed breakwater in the sea area, and has a plurality of sealed floating chambers inside. It has a flat deck and a flat bottom.
[0003]
Therefore, mega floats are versatile, such as offshore airports (including offshore heliports), offshore plant barges and future offshore cities.
[0004]
FIG. 14 shows a mega float equipped with a fixed breakwater. A fixed breakwater b is constructed on the seabed a to create a calm sea area c, and a large floating body e is floated in the calm sea area c and moored to surround it. The pile d is provided and the large floating body e is moored through the buffer member f. The large floating body e has, for example, a length of 1500 m, a width of 500 m, a thickness of 7 m, and a draft of 2 m, and a structure that is thinner than the length.
[0005]
When the wave direction, wave period, and bending stiffness of the large floating body e were systematically changed at a water depth of 20 m, the elastic response analysis calculation in the waves was conducted, and it was found that the design was severe even if the limit wave height was 2 m.
[0006]
In addition, the fixed breakwater b is very expensive to install when the water depth is deep, and the installation of a floating breakwater instead of the fixed breakwater b interferes with the berthing and cargo handling work of the ship. A mega float that does not require a breakwater is desired.
[0007]
In order to eliminate the influence on the cost and the ship and the like without the fixed breakwater b or the floating breakwater, it is necessary to improve the wave resistance performance by taking measures for reducing the shaking of the large floating body e itself. First, as a method, in order to reduce the incident wave with respect to the large floating body e, it is conceivable to add a wave-absorbing structure to the wave upper side of the large floating body e. Conventionally, as shown in FIG. The wave-dissipating structure g was fixed to the wave front front end h of e.
[0008]
As the conventional wave-dissipating structure g, it was considered by utilizing a mechanism such as reflecting, scattering, or crushing waves. The curtain wall type shown in FIG. A tank opening plate type shown in b) and a submerged beach type shown in FIG.
[0009]
[Problems to be solved by the invention]
The curtain wall type described above is effective only in the short wavelength region because it reflects waves immediately, and the tank opening plate type and the submerged beach type are effective up to the long wavelength region because they gradually break and break waves. . However, in order to obtain a sufficient wave-dissipating effect in these, it is necessary to have a considerable length and, according to experiments, about 1/3 of the wavelength. Therefore, if the wavelength is 200 m, a length of 70 to 80 m is required, which increases the size of the wave-dissipating structure and increases the cost.
[0010]
Further, only the above-described wave-dissipating structure has a drawback that horizontal shaking is large and it is difficult to design a mooring device. In addition, there is a problem that the sway on the wave side cannot be reduced, and a further sway reduction effect is desired.
[0011]
The present invention has been made paying attention to the above circumstances, and the object thereof is to provide a wide wave period with a small wave-dissipating structure provided on a large floating body without installing a fixed breakwater or the like. An object of the present invention is to provide a wave-resistant large floating body that can greatly reduce floating body shaking.
[0012]
[Means for Solving the Problems]
To achieve the above object, seaworthiness type Large Floating according to the present invention, the seaworthiness type large floating body floating on water, extending front end portion of the large floating body, from below the bottom surface of the large floating body through the water surface vertical An L-type wave-absorbing structure consisting of a plate and a submerged horizontal plate extending forward from the lower end of the vertical plate, and an extension deck extending forward of the large floating body and extending downward through the water surface Inverted L-type wave-dissipating structures each composed of a vertical plate and a submerged horizontal plate extending backward from the lower end of the vertical plate are provided alternately at substantially equal intervals in the width direction.
[0014]
Further, the seaworthiness type large floating body floating on water, the front end portion of the large floating body, an inclined plate type wave dissipating structure having a submerged inclined plate which extends inclined forwardly downwardly from the bottom surface of the large floating body, wherein An inverted L-type wave-dissipating structure comprising a vertical plate suspended from an extension deck extending forward of a large floating body and extending downward through the water surface and a submerged horizontal plate extending backward from the lower end of the vertical plate ; Are alternately provided at substantially equal intervals in the width direction.
[0015]
Further, in the wave-resistant large floating body that floats on the water, a vertical plate that penetrates the water surface and extends downward from the bottom surface of the large floating body and a submerged portion that extends forward from the lower end portion of the vertical plate at the front end of the large floating body. An L-type wave-dissipating structure composed of a horizontal plate and a small L-type wave-dissipating structure having a smaller dimension than that of the L-type wave-dissipating structure and a submerged horizontal plate are alternately arranged at substantially equal intervals in the width direction. It is characterized by being attached to.
[0016]
Further, the submerged horizontal plate is provided with an opening penetrating in the vertical direction.
[0017]
Further, the submerged inclined plate is provided with an opening penetrating in the vertical direction.
[0018]
The large floating body may be provided with a back-falling inclined plate below the water surface at the wave-end rear end portion of the large floating body.
[0019]
Further, the wave lower rear part of the large floating body, smoothly characterized in that a tapered portion or the notch-shaped portion for passage of decreasing the rigidity backward waves smoothly toward the rear.
[0020]
The large floating body has an extension deck extending to the wave upper side so as to cover the upper surface portion of the wave-dissipating structure with a flat surface, and is attached to the wave upper front end portion of the extension deck and the wave upper side of the large floating body. The submerged horizontal plate of the L-type wave-dissipating structure or the wave front front end of the submerged inclined plate of the inclined plate-type wave-dissipating structure is connected to be able to pass water.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a wave-resistant large floating body according to the present invention will be described in detail with reference to the drawings by way of examples.
[0022]
[First embodiment]
FIG. 1 is an explanatory diagram of the structure of a wave-resistant large floating body according to the first embodiment of the present invention, FIG. 2 is a graph showing the limit significant wave height of various large floating bodies based on the significant wave period, and FIG. It is a graph which shows a displacement on the basis of a significant wave period.
[0023]
Reference numeral 1 in FIG. 1 indicates a large floating body constituting an ultra-large floating body type marine structure (hereinafter referred to as a mega float). The large floating body 1 is formed in a rectangular parallelepiped shape by, for example, a steel plate and sealed inside. A plurality of floating chambers (not shown) are provided. The large floating body 1 floats on the ocean due to the buoyancy generated by the floating chamber. In addition, the code | symbol 2 shows the waterline of the large sized floating body 1, and the code | symbol 3 shows the direction of a wave.
[0024]
At the wavefront front end of the large floating body 1, there are a vertical plate 4 a that penetrates the water surface and extends downward from the bottom surface of the large floating body 1, and a submerged horizontal plate 4 b that extends forward from the lower end of the vertical plate 4 a. An L-shaped wave-dissipating structure 4 made of a steel plate, a vertical plate 5a extending downward via a horizontal mounting plate 6 extending from the upper surface of the large floating body 1, and extending backward from the lower end of the vertical plate 5a The inverted L-type wave-dissipating structures 5 made of steel plates made of the submerged horizontal plates 5b are alternately attached over the entire width of the large floating body 1.
[0025]
The vertical plates 4a and 5a may be slightly inclined forward and backward. In addition, it is possible to substitute the front end plate for the portion where the vertical plate 4a overlaps the front end plate of the large floating body 1, in which case the vertical plate 4a seems to hang down from the lower surface of the large floating body 1 The same.
[0026]
According to the large floating body 1 having such a wave-resistant structure, when a wave enters from the wave upper side in a state of floating on the ocean, the submerged horizontal plate 4b of the L-type wave-dissipating structure 4 and the inverted L-type wave-absorbing structure The fluctuating pressure applied to the submerged horizontal plate 5b of the structure 5 (the value obtained by subtracting the pressure applied to the upper surface from the pressure applied to the lower surface of the submerged horizontal plates 4b and 5b) and the fluctuating pressure applied to the bottom surface of the front end of the large floating body 1 are reversed. Since they are in phase and cancel each other, the integrated pressure value (wave forcing force) of the wave acting on the front end of the large floating body 1 is reduced, and fluctuations can be reduced.
[0027]
It has been confirmed through experiments and the like that the L-type wave-absorbing structure 4 has a long wave period and an excellent vibration reduction rate, and the inverted L-type wave-absorbing structure 5 has a short wave period and an excellent fluctuation reduction rate. As shown in the graph of FIG. 2, the limit significant wave height (significant wave height at which the stress of the mega float falls below the design allowable stress (16kg / mm ² )) as shown in the graph of FIG. Since it rises on the wide wave period side, the large floating body 1 that can be used on the wide wave period side can be designed.
[0028]
Further, according to the present embodiment, which is a composite type, as shown in the graph of FIG. 3, since the rise of horizontal fluctuation is suppressed to a small level, the mooring device can be easily designed (that is, the horizontal displacement is a wave-dissipating structure). Of course, the stress due to ups and downs is excessive in the non-added type, and the limit significant wave height is in a wide range as shown in the graph of Fig. 2. It is impossible to realize.)
[0029]
Also, according to the present embodiment, which is a composite type, a length of about 1/10 is effective with respect to the wavelength. If the wavelength is 200 m, a length of about 20 m is sufficient, and the L type The submerged horizontal plate 4b of the wave-dissipating structure 4 and the inverted L-type wave-dissipating structure 5 can be reduced in size, and the cost can be reduced.
[0030]
[Second Embodiment]
FIG. 4 is an explanatory view of the structure of a wave-resistant large floating body according to the second embodiment of the present invention.
[0031]
In the present embodiment, the slit 8 is formed as an opening penetrating in the vertical direction in the submerged horizontal plate 4b of the L-type wave absorbing structure 4 in the first embodiment. The slits 8 may also be formed in the submerged horizontal plate 5 b of the inverted L-type wave breaking structure 5.
[0032]
In this embodiment, the same operation and effect as in the first embodiment can be obtained, and a damping effect by the vortex-making of the flow passing through the slit 8 is also expected.
[0033]
[Third embodiment]
FIG. 5 is an explanatory view of the structure of a wave-resistant large floating body according to a third embodiment of the present invention.
[0034]
In this embodiment, instead of the inverted L-type wave-absorbing structure 5 in the first embodiment, a small L-type wave-absorbing structure 4A having a relatively smaller size than the L-type wave-absorbing structure 4 in the first embodiment is used. This is an example in which the L-type wave-absorbing structure 4 is combined as a large L-type wave-absorbing structure 4.
[0035]
In this embodiment, the same operation and effect as in the first embodiment can be obtained, and an attenuation effect due to the phase difference between the large and small L-type wave-absorbing structures 4 and 4A can be expected.
[0036]
[Fourth embodiment]
FIG. 6 is an explanatory view of the structure of a wave-resistant large floating body according to the fourth embodiment of the present invention.
[0037]
In this embodiment, instead of the L-type wave-dissipating structure 4 in the first embodiment, an inclined plate-type wave-dissipating structure having a submerged inclined plate 7a extending obliquely downward from the bottom surface of the large floating body 1 is extended. This is an example in which the body 7 is combined with the inverted L-type wave-absorbing structure 5 in the first embodiment. Moreover, you may form the slit 8 (refer FIG. 4) as an opening penetrated to the said submerged inclination board 7a to an up-down direction.
[0038]
In this embodiment, the same operation and effect as in the first embodiment can be obtained.
[0039]
[Fifth embodiment]
FIG. 7 is an explanatory view of the structure of a wave-resistant large floating body showing a fifth embodiment of the present invention.
[0040]
The present embodiment is an example in which a rearwardly inclined plate 10 is attached below the surface of the wave-side rear end of the large floating body 1 in the first embodiment to form a beach type structure. In addition, although the wave-proof structure like 1st-4th Example is attached to the wave front front end part of the large sized floating body 1, it is abbreviate | omitting in drawing.
[0041]
In this embodiment, the same action and effect as in the first to fourth embodiments can be obtained, and the horizontal displacement of the large floating body 1 is reduced by the anchor action of the inclined plate 10 that is lowered rearward. The advantage is that it becomes even easier. Unlike the vertical plate, there are few reflected waves from the rear end of the large floating body.
[0042]
[Sixth embodiment]
FIG. 8 is an explanatory view of the structure of a wave-resistant large floating body according to the sixth embodiment of the present invention.
[0043]
This embodiment is an example in which the wave-side rear end portion of the large floating body 1 in the first embodiment is formed in a tapered shape portion 1a so that the stiffness is smoothly reduced toward the rear. In addition, although the wave-proof structure like 1st-4th Example is attached to the wave front front end part of the large sized floating body 1, it is abbreviate | omitting in drawing.
[0044]
In this embodiment, the same operation and effect as in the first to fourth embodiments can be obtained, and the rigidity smoothly decreases due to the formation of the tapered portion 1a, so that the wave smoothly passes backward. In addition, the reflected wave from the rear end of the large floating body 1 (which is superimposed on the incident wave to increase the shaking of the large floating body 1) is reduced, and the advantage of further reducing the shaking of the large floating body 1 can be obtained.
[0045]
[Seventh embodiment]
FIG. 9 is an explanatory view of the structure of a wave-resistant large floating body according to the seventh embodiment of the present invention.
[0046]
The present embodiment is an example in which the wave-side rear end portion of the large floating body 1 in the first embodiment is formed in a notch-shaped portion 1b having a jagged shape so that the rigidity is smoothly reduced rearward. . In addition, although the wave-proof structure like 1st-4th Example is attached to the wave front front end part of the large sized floating body 1, it is abbreviate | omitting in drawing.
[0047]
In this embodiment, the same operation and effect as in the first to fourth embodiments can be obtained, and the rigidity smoothly decreases due to the formation of the notch-shaped portion 1b, so that the wave smoothly passes backward. In addition, the reflected wave from the rear end of the large floating body 1 (which is superimposed on the incident wave to increase the shaking of the large floating body 1) is reduced, and the advantage of further reducing the shaking of the large floating body 1 can be obtained.
[0048]
[Eighth embodiment]
FIG. 10 is an explanatory view of the structure of a wave-resistant large floating body according to an eighth embodiment of the present invention.
[0049]
In this embodiment, the extension deck 1c is extended on the wave upper side so that the upper surface of the L-type wave-dissipating structure 4 and the inverted L-type wave-dissipating structure 5 is covered with a flat surface on the large floating body 1 in the first embodiment. This is an example in which the front end portion of the extended deck 1c and the front end portion of the submerged horizontal plate 4a of the L-type wave-dissipating structure 4 are connected through a plurality of connecting rods 11 so as to allow water to pass therethrough.
[0050]
In this embodiment, the same operation and effect as in the first embodiment can be obtained, and the advantage that a ship or the like can be berthed on the front surface of the wave-resistant structure is obtained. Further, since the incident wave is crushed by the connecting rod 11 and the wave energy is attenuated, the influence of the incident wave on the large floating body 1 can be reduced.
[0051]
[Ninth embodiment]
FIG. 11 is an explanatory view of the structure of a wave-resistant large floating body according to the ninth embodiment of the present invention.
[0052]
In this embodiment, the extended deck 1c is provided on the wave upper side so that the large floating body 1 in the fourth embodiment covers the upper surfaces of the inclined plate type wave absorbing structure 7 and the inverted L type wave absorbing structure 5 with flat surfaces. This is an example in which the front end portion of the extended deck 1c and the front end portion of the submerged inclined plate 7a of the inclined plate type wave-dissipating structure 7 are connected via a plurality of connecting rods 11 so as to allow water to pass therethrough.
[0053]
In this embodiment, the same operation and effect as in the fourth embodiment can be obtained, and the advantage that a ship or the like can be berthed on the front surface of the wave-resistant structure is obtained. Further, since the incident wave is crushed by the connecting rod 11 and the wave energy is attenuated, the influence of the incident wave on the large floating body 1 can be reduced.
[0054]
[Tenth embodiment]
FIG. 12 is an explanatory view of the structure of a wave-resistant large floating body according to the tenth embodiment of the present invention.
[0055]
In this embodiment, the large floating body 1 in the second embodiment is extended to the wave upper side so as to cover the upper surface portions of the L-type wave-absorbing structure 4 with the slit 8 and the inverted L-type wave-absorbing structure 5 with a flat surface. The deck 1c is extended so that the front end of the extended deck 1c and the front end of the submerged horizontal plate 4a with the slit 8 of the L-type wave-dissipating structure 4 can be passed through a plurality of connecting rods 11. This is an example of connection.
[0056]
In this embodiment, the same actions and effects as in the second embodiment can be obtained, and the advantage that a ship or the like can be berthed on the front surface of the wave-resistant structure is obtained. Further, since the incident wave is crushed by the connecting rod 11 and the wave energy is attenuated, the influence of the incident wave on the large floating body 1 can be reduced. In addition, instead of the plurality of connecting rods 11, a perforated plate, a lattice or the like may be connected so as to allow water to pass therethrough.
[0057]
[Eleventh embodiment]
FIG. 13 is an explanatory view of the structure of a wave-resistant large floating body showing an eleventh embodiment of the present invention.
[0058]
In this embodiment, the large deck 1 in the third embodiment is provided with an extended deck 1c on the wave upper side so as to cover the upper surfaces of the large L-type wave absorbing structure 4 and the small L-type wave absorbing structure 4A with flat surfaces. This is an example in which the front end portion of the extended deck 1c and the front end portion of the submerged horizontal plate 4a of the large L-type wave-dissipating structure 4 are connected via a plurality of connecting rods 11 so that water can pass through.
[0059]
In this embodiment, the same operation and effect as in the third embodiment can be obtained, and the advantage that a ship or the like can be berthed on the front surface of the wave-resistant structure is obtained. Further, since the incident wave is crushed by the connecting rod 11 and the wave energy is attenuated, the influence of the incident wave on the large floating body 1 can be reduced.
[0060]
The present invention is not limited to the above-described embodiments, and without departing from the spirit of the present invention, the large L-type wave-dissipating structure 4, the small L-type wave-dissipating structure 4A, and the inverted L-type wave-dissipating structure 5 It goes without saying that various changes such as changing the composite relationship (combination) or combining the three types are possible.
[0061]
【The invention's effect】
As described above, according to the invention of claim 1, in seaworthiness type large floating body floating on water, before the end of the large floating body, a vertical plate extending from the bottom of the large floating body through the water surface downward this An L-shaped wave-dissipating structure composed of a submerged horizontal plate extending forward from the lower end of the vertical plate, and a vertical plate extending downward from the extended deck extending forward of the large floating body. Since inverted L-type wave-dissipating structures consisting of a submerged horizontal plate extending backward from the lower end of this vertical plate are attached alternately at substantially equal intervals in the width direction, fixed breakwaters, etc. are installed in the sea area Without this, floating body fluctuation can be reduced even in a wide range of wave periods and high waves by a small wave-dissipating structure provided in a large floating body. Further, since horizontal shaking can be suppressed, the mooring device can be easily designed.
[0063]
According to the invention of claim 2 , in the wave-resistant large floating body floating on the water, the front end of the large floating body has a submerged inclined plate extending obliquely downwardly from the bottom surface of the large floating body. From a plate-type wave-dissipating structure, a vertical plate that is suspended from an extension deck extending forward of the large floating body , extends downward through the water surface, and a submerged horizontal plate that extends backward from the lower end of the vertical plate Since the inverted L-type wave-dissipating structures as described above are alternately provided at substantially equal intervals in the width direction, the same effect as that of the invention of claim 1 can be obtained.
[0064]
According to the invention of claim 3 , in the wave-resistant large floating body floating on the water, a vertical plate penetrating the water surface and extending below the bottom surface of the large floating body at the front end portion of the large floating body and a lower end portion of the vertical plate An L-type wave-dissipating structure including a submerged horizontal plate extending forward from the L-type wave-dissipating structure, a small L-type wave-dissipating structure having a vertical plate having a smaller dimension than the L-type wave-dissipating structure, and a submerged horizontal plate Are provided alternately at substantially equal intervals in the width direction, so that the same effect as that of the invention of claim 1 can be obtained.
[0065]
According to the invention of claim 4 , since the submerged horizontal plate is provided with an opening penetrating in the vertical direction, the same effect as that of the invention of claim 1 can be obtained.
[0066]
According to the invention of claim 5 , since the submerged inclined plate is provided with an opening penetrating in the vertical direction, the same effect as that of the invention of claim 1 can be obtained.
[0067]
In addition, according to the invention of claim 6 , since the rear falling inclined plate is provided below the water surface of the wave-side rear end portion of the large floating body, the same effect as that of the invention of claim 1 is obtained. In addition, there is an advantage that horizontal shaking can be further suppressed.
[0068]
Further, according to the invention of claim 7, the wave lower rear part of the large floating body is provided with a tapered portion or the notch-shaped portion to smoothly reduce the rigidity toward the rear pass backward waves smoothly since, with the same effect as the first aspect can be obtained, there is an advantage that can be further reduced floating upset by reducing the reflected waves from the large floating body rear end.
[0069]
Further, according to the invention of claim 8, wherein the large floating body has an extension deck extending the upper surface of the wave dissipating structure wave upward to cover the flat surface, and wave upper front end of the extension deck The submerged horizontal plate of the L-type wave-dissipating structure attached to the wave-side of the large floating body or the wave- front front end of the submerged inclined plate of the inclined-plate-type wave-dissipating structure is connected to be able to pass water. Therefore, the same effect as that of the invention of claim 1 can be obtained, and there is an advantage that a ship or the like can be berthed on the front surface of the wave-dissipating structure.
[Brief description of the drawings]
FIG. 1 is an explanatory view of the structure of a wave-resistant large floating body according to a first embodiment of the present invention.
FIG. 2 is a graph showing limit significant wave heights of various large floating bodies based on a significant wave period.
FIG. 3 is a graph showing horizontal displacements of various large floating bodies based on a significant wave period.
FIG. 4 is an explanatory view of the structure of a wave-resistant large floating body according to a second embodiment of the present invention.
FIG. 5 is an explanatory view of the structure of a wave-resistant large floating body according to a third embodiment of the present invention.
FIG. 6 is an explanatory view of the structure of a wave-resistant large floating body according to a fourth embodiment of the present invention.
FIG. 7 is an explanatory view of the structure of a wave-resistant large floating body according to a fifth embodiment of the present invention.
FIG. 8 is an explanatory view of the structure of a wave-resistant large floating body according to a sixth embodiment of the present invention.
FIG. 9 is an explanatory view of the structure of a wave-resistant large floating body according to a seventh embodiment of the present invention.
FIG. 10 is an explanatory view of the structure of a wave-resistant large floating body according to an eighth embodiment of the present invention.
FIG. 11 is an explanatory view of the structure of a wave-resistant large floating body according to a ninth embodiment of the present invention.
FIG. 12 is an explanatory diagram of the structure of a wave-resistant large floating body according to a tenth embodiment of the present invention.
FIG. 13 is an explanatory view of the structure of a wave-resistant large floating body according to an eleventh embodiment of the present invention.
FIG. 14 is a side view showing a mega float provided with a fixed breakwater.
FIG. 15 is a side view of a mega float having a wave-dissipating structure fixed thereto.
FIGS. 16A to 16C are side views of conventional wave-breaking structures. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Large floating body 1a Tapered shape part 1b Notch shape part 1c Extension deck 4 (Large) L type wave-absorbing structure 4A Small L-type wave-absorbing structure 4a Vertical board 4b Submerged horizontal board 5 Reverse L-type wave-absorbing structure 5a Vertical Plate 5b Submerged horizontal plate 6 Horizontal mounting plate 7a Submerged inclined plate 7 Inclined plate type wave-dissipating structure 8 Slit 10 Rear descending inclined plate 11 Connecting rod

Claims (8)

  In a wave-resistant large-sized floating body floating on the water, a vertical plate that penetrates the water surface and extends downward from the bottom surface of the large-sized floating body and a submerged horizontal plate that extends forward from a lower end portion of the vertical plate at the front end of the large-sized floating body An L-type wave-absorbing structure comprising: a vertical plate that is suspended from an extension deck extending forward of the large floating body and extends downward through the water surface; and a submerged horizontal extending rearward from the lower end of the vertical plate A wave-resistant large-scale floating body characterized in that inverted L-type wave-dissipating structures made of plates are alternately attached in the width direction at substantially equal intervals.   A wave-resistant large floating body that floats on the water, an inclined plate type wave-dissipating structure having a submerged inclined plate that extends at a front end of the large floating body so as to incline downward from a bottom surface of the large floating body, and the large floating body An inverted L-type wave-dissipating structure comprising a vertical plate hanging from an extension deck extending forward and extending downward through the water surface and a submerged horizontal plate extending backward from the lower end of the vertical plate. A wave-resistant large floating body characterized by being alternately attached in the direction at substantially equal intervals.   In a wave-resistant large-sized floating body floating on the water, a vertical plate that penetrates the water surface and extends downward from the bottom surface of the large-sized floating body and a submerged horizontal plate that extends forward from a lower end portion of the vertical plate at the front end of the large-sized floating body And an L-type wave-absorbing structure having a smaller dimension than the L-type wave-absorbing structure and a small L-type wave-absorbing structure having a submerged horizontal plate are provided alternately at substantially equal intervals in the width direction. Wave-resistant large floating body characterized by   The wave-resistant large floating body according to claim 1, 2 or 3, wherein the submerged horizontal plate is provided with an opening penetrating in the vertical direction.   The wave-resistant large-scale floating body according to claim 2, wherein the submerged inclined plate is provided with an opening penetrating in a vertical direction.   6. The wave-resistant large-sized floating body according to claim 1, 2, 3, 4, or 5, further comprising a rear-falling inclined plate provided below the water surface at the wave-end rear end of the large-sized floating body.   The tapered lower portion of the large floating body is provided with a taper-shaped portion or a notch-shaped portion so as to smoothly reduce the rigidity toward the rear and allow the wave to pass rearward smoothly. , 3, 4 or 5. Wave-resistant large floating body. The large floating body has an extension deck extending to the wave upper side so as to cover the upper surface portion of the wave-dissipating structure with a flat surface, and an L-type attached to the wave upper front end of the extension deck and the wave upper side of the large floating body The submerged horizontal plate of the wave-dissipating structure or the wave front front end of the submerged inclined plate of the inclined plate-type wave-dissipating structure is connected so as to allow water to pass therethrough. 5. A wave-resistant large floating body according to 5, 6 or 7.

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