JP5727732B2 - Floating structure - Google Patents

Description

  The present invention relates to a floating structure, and more particularly to a floating structure capable of performing operations such as installation and maintenance of the floating structure in a stable state.

  In recent years, floating type floating structures such as spars and semi-sub types have been proposed as floating structures for offshore wind power generation. A wind power generator installed in such a floating structure is composed of, for example, a mast, a nacelle, and a blade. The spar type floating structure is composed of, for example, a cylindrical floating body and a ballast, and a floating body upright on the sea is moored with a mooring line by the weight of the ballast (for example, see Patent Document 1). ).

  For example, Patent Document 1 discloses a hollow lower floating body in which upper and lower lids and a cylindrical precast concrete block continuously installed between them are joined together by a PC steel material, and a PC mounted on the lower floating body. An offshore structure composed of a hollow upper floating body composed of a precast concrete block having a smaller diameter than that of the precast concrete block and an upper lid, and a ballast tank joined to a lower surface of the lower floating body via a connecting steel pipe, joined by a steel material. A spar-type floating structure for wind power generation is described.

  The semi-sub floating structure is composed of a cylindrical main floating body and a plurality of cylindrical sub floating bodies arranged around the main floating body so that each cylindrical shape stands upright on the sea. The floating objects are connected to each other and moored by a mooring line (see, for example, Patent Document 2).

  For example, Patent Document 2 includes a columnar main floater (corresponding to a main floating body) erected in a posture in which the axis is in the vertical direction, and a power generation windmill is mounted on the upper end of the main floater. A floating body device for disposing a wind turbine for power generation on the ocean by buoyancy of a floater, wherein a plurality of foundation members are arranged around the main floater in a manner connected to a lower end portion of the main floater, and upper ends of the foundation members There is described a floating body device for wind power generation in which mooring floaters (corresponding to sub-floating bodies) each including a mooring line and a float member are supported to be tiltable.

  By the way, in the floating structure as described in Patent Document 1 and Patent Document 2, when performing work such as installation and maintenance of the floating structure (including an upper structure such as a wind power generator), waves, winds, etc. Therefore, there is a problem that the floating structure swings and the work becomes difficult. Therefore, conventionally, the work ship has towed to a place where the swinging of the floating structure is lessened, and then has performed work such as installation and maintenance of the floating structure (for example, see Patent Document 3).

  For example, in the background art section of Patent Document 3, as a method of installing an offshore wind power generator on a spar type floating body, towed to the installation point with the spar type floating body lying on its side, and ballast water is poured into the spar type floating body. A method is described in which a mooring line connected to an anchor is connected to a spar type floating body, and a column, nacelle and blade are attached to the spar type floating body.

  Further, in Patent Document 3, a storage portion for storing a cylindrical spar-type floating body in a laid-down state is formed between two hulls connected at an appropriate interval by a connecting member. A storage part for storing the spar type floating body that is rotated upright is cut out, and a winch for winding a wire for fixing the spar type floating body is installed in the hull on both sides of the storage part, and an automatic position holding device is provided in the hull. A cylindrical spar floating body is stored in the storage section between the hulls of the installed catamaran, and the catamaran is towed to the installation location of the spar floating body, and a plurality of anchors are attached from the catamaran. After suspending, the spar type floating body is rotated around the front side to stand upright, and supports, nacelles and blades are attached to the spar type floating body, and then the offshore wind power generator is connected to the spar type floating body with a mooring line. How to install It has been mounting.

JP 2009-248792 A JP 2009-85167 A JP 2009-13829 A

  However, in the installation method of the offshore wind turbine generator described in Patent Document 3, it is necessary to build a dedicated catamaran that can tow, rotate, and upright the spar type floating body, which increases the cost. there were. Further, when performing work such as maintenance of offshore wind power generators and floating bodies, it is necessary to rotate the spar-type floating body and tow to a calm sea area, and there is a problem that work efficiency is poor.

  The present invention has been devised in view of the above-described problems, and an object thereof is to provide a floating structure capable of performing operations such as installation and maintenance of the floating structure in a stable state.

According to the present invention, a floating-type floating structure that floats on water, the floating body configured to float on water, the legs disposed on the floating body, and the legs connected to the bottom of the water A grounding means for grounding to the ground, and an upper structure disposed at an upper portion of the floating body main body , wherein the upper structure is a wind power generator provided with a blade that is rotationally driven by wind power. The bottom means is a water area in which the floating body main body can float, the floating body main body is in a floating state when the wind power generator is used, and the blade can be exposed to the water surface during installation or maintenance of the wind power generator. The main body is configured to be switchable so as to be in a bottomed state, and the bottoming means is a ballast tank disposed in the floating body main body, and ballast control means for controlling pouring / draining of the ballast tank. And having the rose And so as to ground the legs underwater water injection and by lowering the floating main body to the ballast tank by preparative control unit, floating structure is provided, characterized in that.

  The bottoming means includes a lifting means for supporting the leg portion so as to be lifted and lowered with respect to the floating body main body, and a lifting control means for controlling the lifting means, and the lifting control means controls the lifting means. The leg portion may be grounded to the water bottom by driving.

  The leg portion may include a plurality of branch legs capable of supporting at least three points on the floating body main body portion. Moreover, the said branch leg may be comprised so that the said raising / lowering means may be arrange | positioned separately and the said raising / lowering control means can be raised / lowered separately.

Also, the floating main body is, for example, a spar floating or Semisabu type floating body.

  According to the above-described floating structure according to the present invention, the floating body is configured so that the leg can be grounded to the bottom of the water in the water area where the floating body can float. The structure can be settled down, hardly affected by waves and winds, and operations such as installation and maintenance of the floating structure can be performed in a stable state. In particular, the present invention is effective when an upper structure such as a wind power generator is installed or maintained above the floating structure. In addition, when the water structure where the floating structure is placed is deep, it is only necessary to tow the floating structure to the water area where the floating structure can be landed. be able to.

It is a figure for demonstrating the floating body structure which concerns on 1st embodiment of this invention, (a) is a front view of a floating state, (b) is a control block schematic diagram, (c) is a front view of a bottoming state. , Shows. It is a figure for demonstrating the other example of operation of the floating structure shown in FIG. It is a figure for demonstrating the floating body structure which concerns on 2nd embodiment of this invention, (a) is a front view of a floating state, (b) is a top view of a floating body main-body part, (c) is a control block schematic diagram (D) is a front view of the bottomed state when the water bottom is substantially flat, and (e) is a front view of the bottomed state when the water bottom is not flat. It is a figure for demonstrating the floating body structure which concerns on 3rd embodiment of this invention, (a) is a front view of a floating state, (b) is a control block schematic diagram, (c) is a front view of a semi-submersible state. (D) has shown the front view of the bottoming state in case a water bottom is not flat. It is a figure for demonstrating the floating body structure which concerns on 4th embodiment of this invention, (a) is a front view of a floating state, (b) is BB sectional drawing in Fig.5 (a), (c). Shows a front view of the bottomed state.

  Hereinafter, the floating structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is a figure for demonstrating the floating body structure which concerns on 1st embodiment of this invention, (a) is a front view of a floating state, (b) is a control block schematic diagram, (c). Shows a front view of the bottomed state. Moreover, FIG. 2 is a figure for demonstrating the other example of operation of the floating body structure shown in FIG.

  A floating structure 1 according to the first embodiment of the present invention is a floating type floating structure 1 that floats on water as shown in FIG. 1, and a floating body 2 that is configured to float on water. And a leg 3 disposed on the floating body 2 and a bottoming means 4 for grounding the leg 3 to the bottom BW. The bottoming means 4 is a water area in which the floating body 2 can float. The floating body part 2 is configured to be switchable between a floating state and a bottomed state.

  The floating body part 2 is a part that gives buoyancy to the floating structure 1 and is a part that is exposed to the draft WS. Here, a spar type floating body is illustrated as the floating body main body 2. The floating body 2 of the spar type floating body is configured in a hollow cylindrical shape that can stand upright in water and on water, and is moored by a mooring line 21. A desired upper structure 5 such as a wind power generator is disposed on the upper part of the floating body 2. A ballast tank 41, which will be described later, is arranged inside the floating body 2. The buoyancy of the floating body main body 2 can be adjusted by pouring and draining the ballast tank 41.

  The said leg part 3 is components which support the floating body main part 2 (floating structure 1) of the bottoming state. The leg portion 3 is configured to be able to contact at least the surface of the water bottom BW and may have a shape into which the tip is inserted. Here, the leg part 3 is comprised by the plane plate arrange | positioned at the lower end of the floating body main-body part 2. As shown in FIG. Concavities and convexities and protrusions for increasing the restraining force of the floating body main body 2 may be formed on the contact surface of the flat plate. By disposing the leg 3 on the floating body 2, the floating body 2 (floating structure 1) is hardly affected by waves and winds when the floating body 2 (floating structure 1) is grounded. 1) can be maintained in a stable state (posture).

  The bottoming means 4 is a means for allowing the floating body 2 to float and sink so that the leg 3 can be grounded to the water bottom BW. For example, as shown in FIGS. 1B and 1C, the bottoming means 4 includes a ballast tank 41 arranged in the floating body main body 2 and ballast control for controlling pouring / draining of the ballast tank 41. Means 42, and the ballast control means 42 pours water into the ballast tank 41 to lower the floating body 2 and ground the leg 3 to the bottom BW. In addition, what is necessary is just to make it arrange | position a pressure sensor to the bottom part of the leg part 3, for example whether the leg part 3 earth | grounded.

  The bottoming means 4 includes a pump 43 that is disposed in the floating body main body 2 and that pours and drains the ballast tank 41. The ballast control means 42 pours and drains the ballast tank 41 by controlling the pump 43. Therefore, by arranging such bottoming means 4, the draft WS of the floating body 2 (floating structure 1) can be raised by pouring water into the ballast tank 41, and the floating body can be drained from the ballast tank 41. The draft WS of the part 2 (floating structure 1) can be lowered. The bottoming means 4 may be configured to be remotely operated by a work ship or the like by wire or wireless.

  The upper structure 5 is, for example, a wind power generator 51. The wind power generator 51 includes, for example, a support column 52, a nacelle 53, and a blade 54. The support column 52 is erected on the upper part of the floating body 2 and supports the nacelle 53 and the blade 54. The nacelle 53 has a generator (not shown) inside, and generates electric power by the rotation of the blade 54. The blade 54 is rotationally driven by wind power. The wind power generator 51 is an example of the upper structure 5 installed on the upper part of the floating structure 1, and is a wind condition observation device such as an anemometer and an anemometer, a solar power generation device, a lighting device, and a wireless communication device. Etc.

  Here, the effect | action of the floating structure 1 which concerns on 1st embodiment mentioned above is demonstrated. When the upper structure 5 is installed on the upper part of the floating body 2, first, the floating body 2 is towed to an area where the floating body 2 can float. Then, the floating body part 2 is made upright by pouring water into the ballast tank 41 by the bottoming means 4 and moored by the mooring line 21 to be in a floating state. Thereafter, the floating body 4 is submerged by pouring water into the ballast tank 41 by the bottoming means 4, and the leg 3 is grounded to the water bottom BW to be in the bottomed state. At this time, the upper part of the floating body main body 2 for installing the upper structure 5 may be exposed above the draft WS or may be submerged in water.

  After the floating body portion 2 has settled, the upper structure 5 such as the wind power generator 51 is installed on the floating body portion 2 by the work boat 6 as shown in FIG. When the superstructure 5 is the wind power generator 51, the support column 52 is erected on the floating body 2, the nacelle 53 and the blade 54 are arranged on the support column 52, and other necessary wiring is performed. Therefore, the floating body 2 has the upper structure 5 disposed on the upper part, and the upper structure 5 is installed when the floating body 2 is in the bottomed state.

  After the installation of the upper structure 5 on the floating body 2 is completed, the floating body 2 is raised by draining the ballast tank 41 by the bottoming means 4, and as shown in FIG. The floating structure 1 is brought into a floating state.

  In the floating structure 1 having the upper structure 5, when performing maintenance such as periodic maintenance of the upper structure 5, similarly, the floating body body 2 is settled by pouring water into the ballast tank 41 by the bottoming means 4. The maintenance work may be performed after the leg 3 is grounded to the water bottom BW and the floating structure 1 is set to the bottom. Therefore, the floating body 2 has the upper structure 5 disposed on the upper part, and the upper structure 5 is maintained when the floating body 2 is in the bottomed state.

  In addition, although the case where the upper structure 5 is installed or maintained has been described as an example in which the floating body 2 is in the bottomed state, the present invention is not limited thereto. It is possible to switch between the floating state and the bottomed state at an arbitrary timing as necessary, such as in an irregular state.

  Next, another example of operation of the above-described floating structure 1 will be described. The floating state in FIG. 1A and the bottomed state in FIG. 1C basically assume a place where the floating structure 1 has the same floating place as the bottoming place. That is, the floating structure 1 (floating body portion 2) is towed to a quiet region so that the floating structure 1 can be switched to the bottomed state at the place where the floating structure 1 is placed in a floating state. The maintenance of the upper structure 5 and the floating body 2 is possible.

  However, the depth of the water area where the floating structure 1 is disposed is deep, and it may be difficult to perform operations such as maintenance of the upper structure 5 in the bottomed state. Therefore, as shown in FIG. 2, up to a water area where the floating structure 1 can float and has a water depth that allows the maintenance of the upper structure 5 and the like to be performed while the floating structure 1 is bottomed. The floating structure 1 may be towed by a tugboat or the like. The water area in which the floating structure 1 (floating body main part 2) can float and can be settled is a place where the water depth is deeper than the conventional calm area, and the towing distance of the floating structure 1 (floating body main part 2) is shortened. As a result, work efficiency can be improved.

  Next, another embodiment of the floating structure according to the present invention will be described. Here, FIG. 3 is a figure for demonstrating the floating body structure which concerns on 2nd embodiment of this invention, (a) is a front view of a floating state, (b) is a top view of a floating body main-body part, ( (c) is a schematic diagram of the control block, (d) is a front view of the bottomed state when the water bottom is substantially flat, and (e) is a front view of the bottomed state when the water bottom is not flat. FIG. 4 is a diagram for explaining a floating structure according to the third embodiment of the present invention, in which (a) is a front view in a floating state, (b) is a schematic diagram of a control block, and (c) is a semi-submersible. The front view of a state has shown, (d) has shown the front view of the bottoming state in case the water bottom is not flat. FIG. 5 is a view for explaining a floating structure according to a fourth embodiment of the present invention, where (a) is a front view in a floating state, and (b) is a cross-sectional view along BB in FIG. 5 (a). , (C) shows a front view of the bottomed state.

  As shown in FIG. 3, a floating body structure 101 according to the second embodiment of the present invention is a floating type floating body structure 101 that floats on water and is configured to float on water. And a leg 103 arranged on the floating body 102 and a bottoming means 104 for grounding the leg 103 to the bottom BW. The bottom 104 is a water area in which the floating body 102 can float. The floating body main body 102 can be switched between a floating state and a bottomed state.

  The floating body 102 is a part that gives buoyancy to the floating structure 101 and is a part that is exposed to the draft WS. Here, a semi-sub type floating body is illustrated as the floating body main body 102. For example, as shown in FIGS. 3A and 3B, the floating body body 102 of the semi-sub floating body includes a main hollow cylindrical portion 121 and a plurality of sub-portions arranged around the main hollow cylindrical portion 121. It has a hollow cylindrical portion 122 and a plurality of braces 123 that connect the main hollow cylindrical portion 121 and the sub hollow cylindrical portion 122, and are moored by a mooring line 124. The configuration of the floating body main body 102 is an example of a semi-sub floating body, and, for example, the sub hollow cylindrical portion 122 is not limited to three. Each sub hollow cylindrical portion 122 is provided with a leg portion 103 that can be moved up and down.

  A desired upper structure 105 such as a wind power generator is disposed on the upper part of the floating body 102. The upper structure 105 is the same as the upper structure 5 of the first embodiment. Detailed description will be omitted.

  The said leg part 103 is components which support the floating body main body part 2 (floating body structure 1) of the bottoming state. The leg 103 has a plurality of branch legs 131 capable of supporting at least three points of the floating body main body 102, and each branch leg 131 is disposed in the sub hollow cylindrical part 122. The sub-hollow cylindrical portion 122 incorporates lifting / lowering means 141 that supports the leg portion 103 so that it can be lifted / lowered. Such lifting means 141 may be a hydraulic jack or a power transmission mechanism using an electric motor and a gear mechanism. The lower end portion of the leg 103 may be tapered to increase the contact area, or a flat plate member may be disposed, or may have a sharp shape so as to be inserted into the water bottom BW. You may do it.

  The bottoming means 104 is a means for raising and lowering the leg portion 103 to the water bottom BW so as to be able to contact the ground. As shown in FIG. 3C, the bottoming means 104 includes an elevating means 141 that supports the leg 103 so that it can move up and down with respect to the floating body main body 102, and an elevating control means 142 that controls the elevating means 141. The lifting / lowering means 141 is driven by the lifting / lowering control means 142 so that the leg 103 is grounded to the water bottom BW. Whether or not the leg 103 is grounded may be determined, for example, by placing a pressure sensor at the bottom of the leg 103.

  Therefore, by arranging the bottoming means 104, the leg 103 can be moved up and down, and by lowering the leg 103, the floating body main body 102 (floating structure 101) can be brought into the bottomed state. The floating body body 102 (floating structure 101) can be brought into a floating state by raising the leg 103. Further, the leg portion 103 is composed of a plurality of branch legs 131, and the branch legs 131 have the lifting means 141 individually and can be lifted and lowered individually by the lifting control means 142, so that the bottom BW is flat. Even if this is not the case, the floating body portion 102 (floating structure 101) can be maintained substantially horizontal by individually adjusting the descent depth of each branch leg 131. The bottoming means 104 may be configured to be remotely operated by a work ship or the like by wire or wireless.

  Here, the effect | action of the floating structure 101 which concerns on 2nd embodiment mentioned above is demonstrated. As shown in FIG. 3A, it is assumed that maintenance such as periodic maintenance of the upper structure 105 is performed on the floating structure 101 in a floating state. In this case, the leg 103 is lowered by the bottoming means 104, and the leg 103 is grounded to the water bottom BW as shown in FIG. 3 (d) or 3 (e). By this operation, the floating body structure 101 (floating body body 102) can be switched to the bottomed state. Thereafter, necessary maintenance work is performed using a work boat or the like. Therefore, according to this embodiment, it is difficult to be affected by waves and winds, and operations such as installation and maintenance of the floating structure 101 can be performed in a stable state.

  Further, according to the floating structure 101 of the second embodiment, since the branch leg 131 of the leg portion 103 can be individually raised and lowered, as shown in FIG. 3D, when the water bottom BW is flat. Needless to say, as shown in FIG. 3E, even when the water bottom BW is not flat, the floating structure 101 can be placed in a bottomed state while being maintained substantially horizontal. In addition, when the water area where the floating structure 101 is arranged is so deep that the leg 103 does not reach, after towing by a tugboat or the like to the floatable water area where the leg 103 reaches, similar to the operation method of FIG. The floating structure 101 (floating body body 102) may be bottomed.

  As shown in FIG. 4, a floating body structure 201 according to the third embodiment of the present invention is a floating type floating body structure 201 that floats on water and is configured to float on water. And a leg 203 arranged on the floating body 202 and a bottoming means 204 for grounding the leg 203 to the bottom BW. The bottom 204 is a water area in which the floating body 202 can float. The floating body main body 202 can be switched between a floating state and a bottomed state.

  The floating body 202 is a portion that gives buoyancy to the floating structure 201 and is a portion that is exposed to the draft WS. Here, a semi-sub type floating body is illustrated as the floating body main body 202. For example, as shown in FIG. 4A, the floating body body 202 of the semi-sub floating body includes a main hollow cylindrical portion 221 and a plurality of sub hollow cylindrical portions 222 arranged around the main hollow cylindrical portion 221. A plurality of braces 223 connecting the main hollow cylindrical portion 221 and the sub hollow cylindrical portion 222, and are moored by a mooring line 224. The configuration of the floating body body 202 is an example of a semi-sub floating body, and, for example, the sub hollow cylindrical portion 222 is not limited to three. Each sub hollow cylindrical portion 222 is provided with a leg portion 203 that can be moved up and down. In addition, a ballast tank 241 to be described later is disposed inside the main hollow cylindrical portion 221 so that the buoyancy of the floating structure 201 (floating body main body 202) can be adjusted.

  A desired upper structure 205 such as a wind power generator is disposed on the floating body 202, but the upper structure 205 is the same as the upper structure 5 of the first embodiment. Detailed description will be omitted.

  The bottoming means 204 is a means for raising and lowering the floating body main body 202 so that it can float and sink, and the leg 203 can be grounded to the water bottom BW. That is, the third embodiment is configured such that the floating structure 201 (floating body main body 202) can float and sink by the ballast tank 241 with respect to the floating structure 101 according to the second embodiment.

  For example, as shown in FIG. 4B, the bottoming means 204 includes a ballast tank 241 disposed in the floating body main body 202 (main hollow cylindrical portion 221), and ballast control for controlling pouring / draining of the ballast tank 241. And a lifting / lowering means 243 for supporting the leg 203 so that it can be lifted / lowered with respect to the floating body main body 202, and a lifting / lowering control means 244 for controlling the lifting / lowering means 243. Water is poured to lower the floating body 202, and the lifting control unit 244 drives the lifting unit 243 to ground the leg 203. Whether or not the leg 203 is grounded may be determined by arranging a pressure-sensitive sensor at the bottom of the leg 203, for example.

  The bottoming means 204 includes a pump 245 that is disposed in the floating body main body 202 and that pours and drains the ballast tank 241. The ballast control means 242 pours and drains the ballast tank 241 by controlling the pump 245. Therefore, by arranging the bottoming means 204, the draft WS of the floating body 202 (floating structure 201) can be increased by pouring water into the ballast tank 241, and the floating body can be discharged by draining from the ballast tank 241. The draft WS of the part 202 (floating structure 201) can be lowered.

  The leg portion 203 includes an elevating means 243 and an elevating control means 244, similarly to the leg portion 103 of the floating structure 101 according to the second embodiment. Since these configurations are the same as those in the second embodiment, detailed description thereof is omitted here. Here, the ballast control means 242 and the elevation control means 244 are individually illustrated, but these control means may be integrated.

  Here, the effect | action of the floating structure 201 which concerns on 3rd embodiment mentioned above is demonstrated. As shown in FIG. 4A, it is assumed that maintenance such as periodic maintenance of the upper structure 205 is performed on the floating structure 201 in a floating state. First, as shown in FIG. 4 (c), the floating body body 202 is allowed to settle by pouring water into the ballast tank 241 by the bottoming means 204. Thereafter, as shown in FIG. 4D, the leg 203 is lowered by the landing means 204, and the leg 203 is grounded to the water bottom BW. With this operation, the floating structure 201 (floating body main body 202) can be switched to the bottomed state. Thereafter, necessary maintenance work is performed using a work boat or the like.

  Therefore, according to the present embodiment, work such as installation and maintenance of the floating structure 201 (including the upper structure 205) can be performed in a stable state, hardly affected by waves and wind. In particular, by combining the floating structure 201 (floating body portion 202) with the rise and fall of the leg portion 203, the floating depth of the floating structure 201 (floating body portion 202) can be increased. Even when the structure 201 is disposed in a deep water area, it is possible to perform operations such as installation and maintenance of the floating structure 201 without towing, and work efficiency can be improved. Further, since the legs 203 can be moved up and down individually, as shown in FIG. 4D, the floating body is not only flat when the bottom BW is flat, but also when the bottom BW is not flat. The structure 201 can be in a bottomed state while being maintained substantially horizontal.

  If the water area where the floating structure 201 is arranged is so deep that the leg 203 does not reach, the floating body is towed by a tugboat or the like to the floatable water area where the leg 203 reaches, similar to the operation method of FIG. The structure 201 (floating body main body 202) may be bottomed.

  The fourth embodiment shown in FIG. 5 is a modification of the structure of the leg 3 of the first embodiment. About another structure, since it is the same structure as 1st embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5A and FIG. 5B, the leg 3 in the fourth embodiment has a plurality of branch legs 31 that can support the floating body body 2 at least at three points. Here, three branch legs 31 arranged around the floating body 2 are illustrated. As shown in FIG. 5B, the branch leg 31 is connected to the floating body 2 by a fixing member 32, and each branch leg 31 is connected by a brace 33. Moreover, the leg part 3 is arrange | positioned here so that the lower end of the branch leg 31 and the lower end of the floating body main-body part 2 may be arrange | positioned in the substantially same plane. Therefore, in the illustrated fourth embodiment, four points are supported by the leg 3 and the floating body 2. With this configuration, the stability of the floating structure 1 in the bottomed state illustrated in FIG. 5C can be further improved. Furthermore, the branch leg 31 may be configured to be individually extendable and retractable by an actuator or the like. By configuring the leg 3 to be extendable and contractible, the floating body 2 can be maintained substantially horizontal while monitoring the posture of the floating body 2 with a sensor or the like.

  The present invention is not limited to the above-described embodiments, and can be applied to other floating type floating structures such as a barge type and a tension leg type other than the spar type and the semi-sub type, and departs from the gist of the present invention. Of course, various changes can be made without departing from the scope.

DESCRIPTION OF SYMBOLS 1,101,201 Floating structure 2,102,202 Floating body main part 3,103,203 Leg part 4,104,204 Bottoming means 5,105,205 Upper structure 31,131 Branch leg 41,241 Ballast tank 42 , 242 Ballast control means

Claims (5)

A floating structure floating on the water,
A floating body configured to float on water,
Legs disposed on the floating body body;
Grounding means for grounding the leg to the bottom of the water;
An upper structure disposed on an upper portion of the floating body main body , and
The superstructure is a wind power generator equipped with a blade that is rotationally driven by wind power,
The bottoming means is a water area in which the floating body main body can float, the floating body main body is in a floating state when the wind power generator is used, and the blade can be exposed to the water surface during installation or maintenance of the wind power generator. It is configured to be switchable so that the floating body portion is in a bottomed state,
Further, the bottoming means has a ballast tank disposed in the floating body main body, and ballast control means for controlling pouring / draining of the ballast tank, and the ballast control means fills the ballast tank with water. The floating body was lowered and the legs were grounded to the bottom of the water.
A floating structure characterized by that.   The bottoming means includes a lifting means for supporting the leg portion so as to be lifted and lowered with respect to the floating body main body, and a lifting control means for controlling the lifting means, and the lifting control means controls the lifting means. The floating structure according to claim 1, wherein the floating body structure is configured to be driven so that the leg portion contacts the bottom of the water.   The floating structure according to claim 1, wherein the leg portion includes a plurality of branch legs capable of supporting at least three points of the floating body main body portion. 4. The floating structure according to claim 3 , wherein each of the branch legs is configured such that the elevating means is individually arranged and can be moved up and down individually by the elevating control means.   The floating structure according to claim 1, wherein the floating body part is a spar type floating body or a semi-sub type floating body.