JP2013241911A - Oceanic wind power generation facility, support device thereof and design method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support device of an oceanic wind power generation facility, a design method thereof, and the oceanic wind power generation facility having the support device, easy in strength design, and providing necessary and sufficient strength.SOLUTION: A support device 3 includes three or more legs 31 having the lower end fixed to the sea bottom, a top member 32 for supporting a power generation device and connected with the upper ends of the legs 31 respectively, and a strut 33 horizontally extending by connecting intermediate parts of the adjacent legs 31. Both ends of the strut 33 are connected to the legs 31 via end members 331, and the end member 331 and the legs 31 are formed as a double tube grout structure.

Description

    The present invention relates to an offshore wind power generation facility in which a base is fixed to the seabed and supports a wind power generation device on the ocean, a support device therefor, and a design method therefor.

  Conventionally, wind power generation has attracted attention as one of the power generation methods using natural energy. In particular, the offshore wind power generation is expected to be developed in the future because it can relatively stably use the powerful wind power generated in the vast ocean. The offshore wind power generation includes wind power generation facilities installed in the downstream of large rivers, lakes, and the like where wind power similar to that offshore can be obtained.

The offshore wind power generation equipment used for offshore wind power generation described above is configured to include a power generation device including a propeller that rotates by receiving wind power, and a support device for holding the propeller at a predetermined height on the ocean. The
The power generation device includes a case in which the generator is accommodated, a propeller that receives the wind force, and rotates the generator. In many power generation devices, a pole is installed on the lower surface side of the case and connected to the support device via this pole, but may be connected to the support device by other structures.

The support device fixes the base to the seabed and supports the power generation device at a portion exposed to the ocean. For this purpose, the underwater portion of the support device is constructed to have a length (height) corresponding to the depth of the installation location (the depth of the seabed).
Conventionally, as a support device for offshore wind power generation equipment, three types of monopile type, gravity type and jacket type are mainly used.

A monopile support device has a basic structure of a single continuous pile (monopile). And while fixing the base of a pile to the seabed, the upper end of a pile is exposed to the ocean, the pole of the power generator mentioned above is connected to this upper end, and this supports a power generator on the ocean (refer patent document 1).
Such a monopile support device has an advantage that the structure is simple and the equipment cost is small when the water depth is shallow. However, since the structure is simple, there are few conditions or parameters that can be adjusted.

  Gravity-type support devices are suitable for hard and flat ground. However, in addition to the work of flattening the ground surface for installation, the support device becomes a heavy object, which increases the cost of transportation.

The jacket-type support device has a three-dimensional truss structure in which a plurality of piles or legs are arranged and adjacent legs are fixed to each other with diagonal materials or horizontal materials, and the base portion of each leg is fixed to the seabed. Then, the upper side of each leg is exposed to the ocean in a bundled state, and its upper end is connected to the lower surface of the case of the power generation device, thereby supporting the power generation device on the ocean (see Patent Document 2).
Such a jacket-type support device inevitably increases the complexity of the structure and the equipment cost. However, the design of each part of the leg and the truss structure has an advantage that a sufficient strength as a support device can be secured and the options such as conditions that can be used for adjustment are wide.

In such a support device, it is necessary to satisfy the strength conditions as an offshore wind power generation facility, regardless of which method is used.
For example, in addition to bearing the weight of the power generation device, it is necessary to withstand loads such as bending and shearing on the support device by receiving wind power at the power generation device. Further, the support device itself is affected by wind power in the offshore portion, and further, the influence of wave force and fluid force is also generated in the underwater portion of the support device.
These wind and wave forces and fluid forces are not only applied to the support device as external forces, but can also be caused by repeated external forces and even fatigue failure due to resonance.
For this reason, in designing the support device, adjustment of the natural frequency is appropriately performed in consideration of avoiding resonance including the power generation device in addition to ensuring the structural strength (Patent Document 3). , 4, 5).

JP 2003-293938 A JP 2003-206852 A Japanese Patent No. 47768857 Japanese Patent No. 483847 Special table 2010-514978 gazette

By the way, the type of the supporting device described above is properly used depending on the water depth of the place where the offshore wind power generation facility is installed.
In a low water depth region where the water depth is less than 30 m, since the strength of the support device may be relatively small, a monopile type or gravity type support device is often used.
In medium and high water depths of 30 m or more, a jacket-type support device is used because the support device needs to have sufficient strength.

Among these, the jacket type support device is used as described above for the middle water depth range of about 30 to 50 m.
However, as a support device used in the middle water depth region, the strength as high as the high water depth region of 50 m or more is not required. For this reason, when the jacket-type support device is used for a mid-water deep region, adjustment (design change) is made so as to relax the rigidity as compared with a high-water deep region.
However, as described above, the jacket-type support device has a truss structure, and since the structure is complicated, there are a wide variety of parameters related to the adjustment of strength, and redesign and recalculation of the structural strength associated therewith are remarkable. There is a problem that it becomes complicated.
Furthermore, since the jacket-type support device has the truss structure as described above, the basic strength is high, and there is a possibility that the adjustment to reduce the strength to the extent required in the middle water depth region cannot be performed sufficiently. .

On the other hand, it is also conceivable to use a monopile type support device or a gravity type support device and adjust it so as to be suitable for a mid-water depth range of 30 m or more.
However, since the structure of the monopile type support device is simple, there are few options available for adjustment, and only limited adjustment such as increasing the thickness of the pile material can be employed. If an attempt is made to adjust a monopile-type support device for deep water using only such an increase in plate thickness, it becomes an unrealistic thickness and weight pile, making it a realistic support device for deep water. It was difficult.
On the other hand, the gravitational support device is a heavy mass and there is no room for adjustment, and adjustment is performed exclusively on the power generation device side.

  An object of the present invention is to provide an offshore wind power generation facility, a support device for the offshore wind power generation facility, and a design method for the offshore wind power generation facility which can easily perform necessary and sufficient strength design.

The support device of the offshore wind power generation facility of the present invention includes three or more legs whose lower ends are fixed to the sea floor, a top member that supports the power generation device and to which the upper ends of the legs are respectively connected, and the adjacent legs. And struts extending horizontally by connecting the intermediate portions.
In the present invention, the strut is a simple horizontal shaft member, which is different from a complicated truss structure that connects legs like a conventional jacket-type support device.

In the present invention, the power generation device can be supported on the ocean by fixing the lower end of the leg to the seabed and connecting the power generation device to the top member.
In this case, the support device is composed of legs, a top member and struts, and the individual design of these legs and strut members, the number of legs and the number of struts, the slope of the legs arranged in an inclined manner, or the struts relative to the legs. The strength of the support device can be arbitrarily designed by arranging the height and the like, and designing the connecting portion between the leg and the top member and the leg and the strut.
As described above, the support device is composed of the leg, the top member, and the strut, and there are many options for strength adjustment in each part as compared with the conventional monopile type, and a necessary and sufficient support device can be appropriately designed. In addition, since there is no complicated truss structure like the conventional jacket type, it is not necessary to take measures to mitigate excessive strength, and it is only necessary to design for limited members such as legs, top members, and struts, so that it is necessary and sufficient strength. The supporting device can be easily designed.
Furthermore, in this invention, since there are few members arrange | positioned in the sea, the pressure receiving area of a wave can be reduced.

In the support device for offshore wind power generation equipment according to the present invention, the top member has a cylindrical main body with a central axis arranged vertically, and the leg is linearly inclined with a lower end away from the central axis of the main body. It is desirable that the shaft is made of a simple shaft material.
In the present invention as described above, the legs using the linear shaft members are arranged to be inclined with a predetermined gradient, and a pyramid-like structure is formed as the entire support device. By adopting a simple configuration with such a straight leg and a horizontally extending strut, the above-described ease of design can be further promoted.
In the support device of the present invention, the legs may not be inclined, for example, a plurality of legs may be vertical and parallel to each other, and a part of the legs may be bent or formed in a curve. It may be.

In the apparatus for supporting offshore wind power generation equipment according to the present invention, the leg is a tubular shaft member, and the strut has a tubular end member through which the leg is inserted at both ends of a linear shaft member. It is desirable that a grout material is filled between the inner surface of the leg and the outer surface of the leg.
In the present invention as described above, the connection between the leg and the strut can be a so-called double pipe grout coupling structure in which a grout material is interposed, and the structure of the connection portion can be simplified. Further, when changing the connecting position in the leg, the need to process the leg itself can be eliminated, and the design can be further facilitated.

In the support device for offshore wind power generation equipment according to the present invention, the strut may be provided with an outer tube and an inner tube, and a double tube structure that can be expanded and contracted in the longitudinal direction is formed.
In the double-pipe structure, the struts can be made suitable lengths, and a grout material can be filled between the inner pipe and the outer pipe, thereby fixing the inner pipe and the outer pipe to each other.
In the present invention, the length of the strut, that is, the distance between the end members at both ends can be arbitrarily set using the same member. Therefore, even when the strut connection position is adjusted up and down when the leg is inclined, the strut length can be easily adjusted in accordance with the leg gradient.

In the support device for an offshore wind power generation facility according to the present invention, the strut may be configured to be rotatably connected to the leg.
In the present invention, even if the slope of the leg changes, the top member or the connecting portion with the strut can be rotated to cope with an arbitrary slope, and the slope is adjusted when the leg is inclined. Can be easily performed.

  The method for designing a support device for an offshore wind power generation facility according to the present invention includes three or more legs whose lower ends are fixed to the seabed, and a top member that supports the power generation device and to which the upper ends of the legs are respectively connected. A support device for an offshore wind power generation facility having a strut extending horizontally by connecting intermediate portions of the legs, setting an initial shape of the support device, performing eigenvalue analysis of the support device, The first stage of adjusting the leg and the strut until the eigenvalue analysis is out of the resonance range, the cross-sectional calculation of the support device is performed, the eigenvalue analysis of the support device is performed, and the eigenvalue analysis is performed out of the resonance range A second stage for adjusting the leg and the strut, and in the adjustment of the leg and the strut in the first stage and the second stage, first the leg If the position change is within the leg gradient limit, eigenvalue analysis of the support device is performed based on the changed leg arrangement, and if the leg change results in exceeding the leg gradient limit, The strut is adjusted, and the eigenvalue analysis of the support device is performed based on the adjusted strut.

In the present invention, the strut adjustment from the first stage leg setting based on the initial setting, the strut adjustment from the second stage leg setting in consideration of the cross-section calculation for the design contents adjusted for the initial setting. By carrying out the adjustment sequentially, an appropriate support device can be designed.
In particular, in the first-stage and second-stage adjustments, it is possible to design efficiently by first adjusting the legs and then adjusting the struts. Further, the procedure from the adjustment of the leg to the adjustment of the strut can be made common by the adjustment of the first stage and the second stage.
The conventional jacket-type support device includes a truss structure, so even if it is partly changed, the entire recalculation is required. If adjustment is necessary in the initial setting, it is necessary to repeat complicated recalculation. On the other hand, according to the present invention, a desired support device can be easily designed by a series of procedures.

The offshore wind power generation facility of the present invention includes a power generation device, three or more legs whose lower ends are fixed to the seabed, and a top member that supports the power generation device and to which the upper ends of the legs are respectively connected. And a strut extending horizontally by connecting intermediate portions of the legs.
In the present invention as described above, the respective functions and effects described above of the support device of the present invention can be obtained by the legs, the top member, and the struts having the same configuration as the support device described above.
Furthermore, in this invention, since there are few members arrange | positioned in the sea in order to support an electric power generating apparatus, the pressure-receiving area of a wave can be reduced.

The perspective view which shows the offshore wind power generation equipment of 1st Embodiment of this invention. The perspective view which shows the support apparatus of the said 1st Embodiment. The disassembled perspective view which shows the assembly state of the support apparatus of the said 1st Embodiment. The disassembled perspective view which shows the double pipe grout coupling | bonding structure of the said 1st Embodiment. The flowchart which shows the design procedure of the said 1st Embodiment. The graph which shows the application water depth of the said 1st Embodiment. The perspective view which shows the support apparatus of 2nd Embodiment of this invention. The disassembled perspective view which shows the support apparatus of the said 2nd Embodiment. The perspective view which shows the support apparatus of 3rd Embodiment of this invention. The disassembled perspective view which shows the support apparatus of the said 3rd Embodiment. The perspective view which shows the modification of a double pipe grout coupling | bonding structure.

[First Embodiment]
1 to 6 show a first embodiment of the present invention.
In FIG. 1, an offshore wind power generation facility 1 according to this embodiment includes a power generation device 2 for offshore wind power generation, and a support device 3 for holding the power generation device 2 at a predetermined height on the ocean.

The power generation device 2 includes a propeller 21 that rotates by receiving wind power, and a case 22 that houses a power generation mechanism therein, and a support pole 23 is connected to the lower surface side of the case 22.
The support device 3 includes four legs 31 whose lower ends are fixed to the seabed, a top member 32 that supports the pole 23 of the power generation device 2 and to which the upper ends of the legs 31 are respectively connected, and an intermediate portion between adjacent legs 31. And four struts 33 extending horizontally.

  As shown in FIGS. 2 and 3, the four legs 31 are steel pipes each having a circular cross section extending linearly. The four struts 33 are steel pipes each having a circular cross section that extends linearly. The four legs 31 are arranged such that the lower ends connected to each other by the struts 33 are separated from each other with respect to the upper ends collected by the top member 32, and the support device 3 as a whole has a quadrangular pyramid shape. Is at the position of the ridgeline of the quadrangular pyramid described above and is inclined at a predetermined gradient with respect to the vertical direction.

The top member 32 is a steel cylindrical member, the central axis is arranged vertically, and the pole 23 of the power generator 2 can be inserted and coupled to the inside thereof.
Around the top member 32, the first connecting member 321 is fixed at the lower end position, the second connecting member 322 is fixed at the intermediate height position, and the reinforcing member 323 is fixed so as to connect the two.

The first connecting member 321 has a portion protruding in the four directions of the top member 32, and an insertion hole is formed in the protruding portion. As shown in FIG. 3, the leg 31 is inserted into the insertion hole from below, and the entire circumference of the insertion hole is welded to the outer peripheral surface of the leg 31 in the state shown in FIG. 2.
The second connecting member 322 has a portion projecting in the four directions of the top member 32, and the end portion of the leg 31 inserted from below into the insertion hole of the first connecting member 321 can come into contact with the projecting portion. It is. As shown in FIG. 3, the overhanging portion is inserted into the leg 31 from below and welded to the end surface of the leg 31 in the state shown in FIG. 2.

  The reinforcing member 323 has upper and lower end edges welded to the first connecting member 321 and the second connecting member 322, respectively, and an edge along the outer periphery of the top member 32 is welded to the outer periphery of the top member 32. . Further, the edge opposite to the top member 32 is formed along the outer peripheral surface of the leg 31 when the leg 31 is inserted from below into the insertion hole of the first connecting member 321 as shown in FIG. ing. In the state of FIG. 2, the outer periphery of the leg 31 is welded.

The struts 33 are arranged so that four are square, and the ends of each strut 33 are connected to the end members 331 respectively arranged at the four apexes of the square, thereby forming a frame having a square shape in plan view. doing.
As shown in FIG. 4, the end member 331 is a steel cylinder, and the struts 33 are welded to the outer peripheral surface from two directions. At this time, the end member 331 is installed so that the central axis of the end member 331 has an inclination angle commensurate with the gradient of the leg 31 in a state in which the struts 33 in two directions are respectively horizontal and at 90 degrees.

  The end member 331 has an inner diameter through which the leg 31 can be inserted, and a predetermined gap is formed between the end member 331 and the outer peripheral surface of the leg 31 when the leg 31 is inserted. Then, with the legs 31 inserted inside the four end members 331 (see FIG. 2 or FIG. 3), the gap 31 is filled with a grout material and solidified, so that the legs 31 and the end members 331 become solid. The legs 31 are connected to each other by the struts 33.

In addition, as shown in FIG. 4, the unevenness | corrugation by the protrusion rib 332 of an anti-slipping is formed in the inner peripheral surface of the end member 331, and the outer periphery of the connection part with the end member 331 of the leg 31 is also by the same protrusion 312. Concavities and convexities are formed, and these concavities and convexities bite into the grout material so that the mutual connection is maintained in place.
Thus, the leg 31 and the strut 33 are connected by the double pipe grout coupling structure using the end member 331.

FIG. 5 shows a design procedure of the support device 3 in the present embodiment.
In designing the support device 3, first, an initial shape of the support device 3 is set (step S11). In the initial setting, the basic shape of the support device 3 (schematic shape such as a quadrangular pyramid shape or a triangular pyramid shape, the number of legs 31, the installation height and the number of steps of the struts 33), each component member (leg 31, top member) 32, struts 33, etc.) are tentatively set.

Next, eigenvalue analysis of the support device 3 is performed based on the initial setting (step S12). In the eigenvalue analysis, the natural frequency of the support device 3 is analyzed by an existing method. Then, the possibility of resonance is determined based on the topography of the installation location of the offshore wind power generation facility 1, the climatic conditions, etc. (step S13).
As a result of the determination, if it is out of the resonance range, the process proceeds to the section calculation (procedure S17) as it is, but if there is a possibility of resonance, further adjustment is performed (adjustment in the first stage, procedures S14 to S16).

In the first stage adjustment, first, the arrangement change of the legs 31 is examined (procedure S14). Specifically, in addition to changing the slope of the leg 31, the lower end position and the upper end position thereof are changed, and the interval between them is adjusted as appropriate. Next, it is determined whether the adjusted gradient of the leg 31 satisfies the gradient limitation of the support device 3 (step S15), and if so, the process returns to the eigenvalue analysis (step S12) and starts again.
If the gradient limitation cannot be satisfied, the adjustment by the leg 31 is stopped there and the strut 33 is adjusted (step S16). Specifically, the installation height of the strut 33 is adjusted, or when the adjustment is not sufficient with the one-stage strut 33, it is considered to add the strut 33 to two stages. After performing such adjustment, the process returns to the eigenvalue analysis (step S12) and is performed again.
Such first-stage adjustment is repeated until the result of the eigenvalue analysis (procedure S12) is determined (procedure S13) to be outside the resonance range.
When it is out of the resonance range, the process proceeds to the cross section calculation (procedure S17).

In the cross-sectional calculation (procedure S17), the strength calculation as the support device 3 including the cross-sectional shapes of the leg 31 and the strut 33 is performed based on the initial setting or the setting obtained by the first stage adjustment.
Here, if the result of the cross-sectional calculation of the leg 31 and the strut 33 is within an allowable range (step S18), the design of the support device 3 is completed.

On the other hand, when the cross section is outside the allowable range, the cross section adjustment (procedure S21) is performed. Specifically, the cross-sectional shapes of the leg 31 and the strut 33, for example, the outer diameter and inner diameter, the thickness, the material, and the like are adjusted.
Next, the eigenvalue analysis (procedure S22) of the support device 3 is performed based on the design content adjusted by the cross-section adjustment (procedure S21), and the possibility of the resonance of the offshore wind power generation facility 1 is determined (procedure S23). These eigenvalue analysis and determination are the same as the eigenvalue analysis (procedure S12) and the determination (procedure S13) described above.
If the result of determination is that it is outside the resonance range, the design of the support device 3 is completed.
If there is a possibility of resonance, further adjustment is performed until the resonance is out of the resonance range (second stage adjustment, steps S24 to S26).
Each procedure S24 to S26 in the second stage adjustment is the same as each procedure S14 to S16 in the first stage adjustment. For this reason, the overlapping description about procedure S24-S26 is abbreviate | omitted.

FIG. 6 shows the application status of the support device 3 designed in this embodiment for each water depth region.
In the region where the water depth is around 30 m, the height of the supporting device 3 from the seabed is low, and the influence of wave force and fluid force is relatively small. Therefore, the strut 33 may be only one stage. Necessary and sufficient strength can be obtained only by adjusting the gradient of 31.
In the region around the depth of 40 m, the height of the support device 3 from the sea floor is slightly high, and the strut 33 is made up of one or two steps in consideration of the influence of wave force and fluid force. By designing according to the procedure of FIG. 5 described above, the gradient adjustment of the legs 31 and the adjustment of the struts 33 are performed, and the struts 33 are added as necessary to obtain the necessary and sufficient strength.
In a region around a water depth of 50 m, the height of the support device 3 from the sea floor is sufficiently high, and the influence of wave force and fluid force is also large. For this reason, the struts 33 are considered to be one or two stages, and two stages with increased strength if necessary. Even in this case, by designing according to the procedure of FIG. 5 described above, the gradient adjustment of the legs 31 and the adjustment of the struts 33 are performed, and the struts 33 are added as necessary to obtain a necessary and sufficient strength. .

According to the first embodiment described above, the following effects can be obtained.
By fixing the lower end of the leg 31 to the seabed and connecting the power generation device 2 to the top member 32, the power generation device 2 can be supported on the ocean, and the offshore wind power generation facility 1 can be constructed.
At this time, the support device 3 is composed of the leg 31, the top member 32, and the strut 33, and the individual design as the members of the leg 31 and the strut 33, the number of the legs 31 and the number of steps of the strut 33, and the slant arrangement. The strength of the support device 3 can be arbitrarily designed by arranging the gradient of the leg 31 or the height of the strut 33 relative to the leg 31 and the design of the connecting portion between the leg 31 and the top member 32 and the leg 31 and the strut 33. it can.

  In this embodiment, the support device 3 is composed of a leg 31, a top member 32, and a strut 33, and there are many options for strength adjustment in each part as compared with the conventional monopile type, and the necessary and sufficient support device 3 is appropriately designed. be able to. Further, since there is no truss structure as in the conventional jacket type, it is not necessary to take measures to alleviate excessive strength, and it is sufficient to design only limited members such as the leg 31, the top member 32, and the strut 33. The strong support device 3 can be easily designed.

  In the present embodiment, the leg 31 using the steel pipe that is a linear shaft member is disposed to be inclined, and the support device 3 as a whole is formed with a quadrangular pyramid-like structure. Further, the structure can be simplified by the horizontally extending struts 33, and the above-described ease of design can be further promoted.

  In the present embodiment, a tubular end member 331 is used to connect the leg 31 and the strut 33, and a so-called double pipe grout coupling structure in which a grout material is interposed can be obtained, thereby simplifying the structure of the connecting portion. be able to. Furthermore, even when there is a change in the connection position in the leg 31, it is only necessary to shift the fixing position of the end member 331 (the position where the protrusion 312 of the leg 31 is formed), and the need to process the leg 31 itself can be eliminated. These can further facilitate the design.

[Second Embodiment]
7 and 8 show a second embodiment of the present invention.
In the present embodiment, in the offshore wind power generation facility 1 (see FIG. 1) of the first embodiment described above, the power generation device 2 is supported by a support device 3A (see FIGS. 7 and 8).
Among these, since the offshore wind power generation facility 1 and the power generation device 2 are the same as those in the first embodiment described above, the same reference numerals are assigned and redundant descriptions are omitted. Hereinafter, the support device 3A of the present embodiment will be described.

As shown in FIG. 7 and FIG. 8, the supporting device 3A supports four legs 31 whose lower ends are fixed to the seabed, and poles 23 (see FIG. 1) of the power generator 2, and the upper ends of the legs 31 are respectively The top member 32 to be connected and four struts 33A extending horizontally by connecting intermediate portions of the adjacent legs 31 are provided.
The leg 31 and the top member 32 of the present embodiment are configured in the same manner as in the first embodiment described above, and redundant description is omitted.

The strut 33A of the present embodiment has an outer tube 333 and an inner tube 334, which are steel pipes each having a circular cross section extending linearly.
The outer tube 333 is long enough for the strut 33A.
The inner tube 334 is about a fraction of the outer tube 333 and its outer diameter is slightly smaller than the inner diameter of the outer tube 333.
One end of the inner tube 334 is inserted from one end of the outer tube 333 into the inside, and the strut 33A can telescopically expand and contract because the portion is a double tube.

An end member 335 and an end member 336 are connected to the end of the strut 33A.
The end member 335 is connected to the outer tube 333 of the strut 33A, and the end member 336 is connected to the inner tube 334 of the strut 33A.
These end members 335 and 336 are configured in the same manner as the end member 331 (see FIG. 4) of the first embodiment described above, and are connected to the leg 31 by forming a double tube grout coupling structure.

Two outer tubes 333 are connected to the end member 335 at intervals of 90 degrees, and the end member 335 and the outer tube 333 form a large V-shaped assembly.
Two inner pipes 334 are connected to the end member 336 at intervals of 90 degrees, and the end member 336 and the inner pipe 334 form a small V-shaped assembly.

In this embodiment, a pair of the large V-shaped assemblies (the end member 335 and the two outer pipes 333) described above are arranged to face each other, and the small V-shaped assemblies (the end members 336 and 336) described above from both sides. The two inner tubes 334) are placed close to each other so as to face each other, whereby each inner tube 334 is inserted into the pair of outer tubes 333, thereby connecting all the V-shaped assemblies to four struts. A planar square frame having 33A can be constructed.
This frame can adjust the length of the strut 33A by shifting the double portions of the outer tube 333 and the inner tube 334.

The planar square frame having the four struts 33A described above constitutes the support device 3A by inserting the four legs 31 described above into the end members 335 and 336 arranged at the respective vertex portions.
Here, the four legs 31 are inclined with a predetermined gradient, and when the height position connected by the strut 33A is adjusted, the length of the strut 33A changes.
On the other hand, the strut 33A of this embodiment can be expanded and contracted by the double structure of the outer tube 333 and the inner tube 334 described above, and can be fixed in an arbitrary length state.
When the length of the strut 33A is determined, the gap between the double structure of the outer tube 333 and the inner tube 334 is filled with a grout material and fixed to each other.

In this embodiment, by using the outer tube 333, the inner tube 334, and the end members 335 and 336 as the strut 33A, the length of the strut 33A can be arbitrarily set using these same members as they are. .
For this reason, in the support device 3A in which the leg 31 is inclined, even when the connecting position of the strut 33A is adjusted up and down, the length adjustment of the strut 33A according to the gradient of the leg 31 can be easily performed.
Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the height adjustment of the strut 33A can be easily performed.

[Third Embodiment]
9 and 10 show a third embodiment of the present invention.
In the present embodiment, in the offshore wind power generation facility 1 (see FIG. 1) of the first embodiment described above, the power generation device 2 is supported by a support device 3B (see FIGS. 9 and 10).
Among these, since the offshore wind power generation facility 1 and the power generation device 2 are the same as those in the first embodiment described above, the same reference numerals are assigned and redundant descriptions are omitted. Hereinafter, the support device 3B of the present embodiment will be described.

As shown in FIG. 9 and FIG. 10, the support device 3B includes four legs 31B whose lower ends are fixed to the seabed, and poles 23 (see FIG. 1) of the power generator 2 and the upper ends of the legs 31B are respectively It has a top member 32 to be connected and four struts 33B extending horizontally by connecting intermediate portions of adjacent legs 31B.
The top member 32 of this embodiment is comprised similarly to 1st Embodiment each mentioned above, and the overlapping description is abbreviate | omitted.

The leg 31B of the present embodiment has a main pipe 317 and a sub pipe 318 which are steel pipes each having a circular cross section extending linearly, and the main pipe 317 and the sub pipe 318 are rotatably connected by a pin joint type joint 319. Has been.
The main pipe 317 is a steel pipe similar to the leg 31 of the first embodiment described above, and has a sufficient length extending to the seabed.
The secondary pipe 318 is a steel pipe similar to the main pipe 317, but has a length corresponding to the distance from the first connection member 321 to the second connection member 322 of the top member 32.

In such a leg 31 </ b> B of this embodiment, the upper end of the leg 31 </ b> B is connected to the top member 32 by welding and fixing the sub pipe 318 to the first connection member 321 and the second connection member 322 of the top member 32.
At this time, the rotation shaft of the joint 319 is horizontally arranged, and the main pipe 317 of the leg 31B is swung around the joint 319 so that the lower end side of the leg 31B is closely spaced from the central axis of the top member 32. To do.
Thereby, when the leg 31B is inclinedly arranged in the support device 3, the gradient as the leg 31B can be adjusted by swinging the main pipe 317.

  The strut 33B of the present embodiment is similar to the strut 33A (see FIGS. 7 and 8) of the second embodiment described above, and the double-tube outer tube 333 and inner tube 334 and end members to which these are connected. 335,336. However, the following points differ from the strut 33A of the second embodiment described above.

A connecting member 338 is rotatably connected to the end members 335 and 336 via pin jointed joints 339, respectively.
The outer tube 333 and the inner tube 334 are not directly connected to the end members 335 and 336, respectively, but two are connected to the connecting member 338 in a 90-degree arrangement.
The outer tube 333, the inner tube 334, and the connection member 338 form a plane square frame, and the frame is obtained by connecting end members 335 and 336 to the respective vertex positions via joints 339.

The rotation axis of the joint 339 is arranged in parallel with the rotation axis of the joint 319 described above, and when the gradient of the leg 31B changes, the frame formed by the outer tube 333, the inner tube 334, and the connecting member 338. However, the end members 335 and 336 can follow the rotation.
Therefore, when the leg 31B is inclined in the support device 3, even when the inclination of the leg 31B is adjusted by swinging the main pipe 317, the strut 33B changes the inclination of the leg 31B by the rotation of the end members 335 and 336. Can respond.
Thus, in this embodiment, even if the gradient of the leg 31B changes, the joints 319 and 339 between the top member 32 or the struts 33B rotate, so that any gradient can be handled. It is possible to easily adjust the gradient when the leg 31B is inclined.

[Modification]
The present invention is not limited to the above-described embodiments, and modifications and the like within the scope not departing from the object of the present invention are included in the present invention.
For example, as shown in FIG. 11, an outer flange 331 </ b> F may be formed on the outer periphery of the upper and lower ends of the end member 331 to reinforce the rigidity of the end member 331.
The connection between the end members 331, 335, 336 and the legs 31, 31B is not limited to the double pipe grout structure, and bolt fastening or welding may be employed.
When the struts 33, 33A, 33B are welded to the legs 31, 31B, the end members 331, 335, 336 may be omitted, and the struts 33, 33A, 33B may be directly welded to the legs 31, 31B.

The connection between the first connecting member 321 and the second connecting member 322 of the top member 32 and the legs 31 and 31B is not limited to welding, and may be a bolt fastening or a double pipe grout structure.
When connecting the top member 32 and the legs 31 and 31B, not only the first connection member 321 and the second connection member 322 but also three or more connection members may be arranged.
The reinforcing member 323 of the top member 32 may have other shapes and arrangements. Further, the reinforcing member 323 of the top member 32 is not essential and may be omitted as appropriate.

In each of the embodiments described above, a quadrangular pyramid having four legs 31 and 31B is used, but a triangular pyramid having three legs may be used, and other shapes having five or more legs, for example, a hexagonal pyramid. It may be a shape.
In the above-described embodiment, the legs 31, 31B and the struts 33, 33A, 33B are formed of linear shafts, but these may be partially bent shafts or curved shafts as a whole.

DESCRIPTION OF SYMBOLS 1 ... Offshore wind power generation equipment 2 ... Power generator 21 ... Propeller 22 ... Case 23 ... Pole 3, 3A, 3B ... Supporting device 31, 31B ... Leg 312 ... Projection 317 ... Main pipe 318 ... Sub pipe 319 ... Joint 32 ... Top member 321 ... first connection member 322 ... second connection member 323 ... reinforcing members 33, 33A, 33B ... struts 331, 335, 336 ... end members 331F ... outer flange 332 ... projection 333 ... outer tube 334 ... inner tube 338 ... connection Member 339 ... Joint

Claims (7)

  Three or more legs whose lower ends are fixed to the seabed; a top member that supports the power generator and to which the upper ends of the legs are respectively connected; struts that extend horizontally by connecting intermediate portions of the adjacent legs; A device for supporting offshore wind power generation equipment, comprising: In the support apparatus of the offshore wind power generation facility of Claim 1,
The top member has a cylindrical main body with a central axis arranged vertically, and the leg is composed of a linear shaft inclined at a lower end away from the central axis of the main body. Support equipment for offshore wind power generation facilities. In the support apparatus of the offshore wind power generation facility of Claim 1 or Claim 2,
The leg is a tubular shaft member, and the strut has a tubular end member through which the leg is inserted at both ends of a linear shaft member, and is between the inner surface of the end member and the outer surface of the leg. A support device for an offshore wind power generation facility, which is filled with a grout material. In the support apparatus of the offshore wind power generation equipment in any one of Claims 1-3,
A support device for an offshore wind power generation facility, characterized in that a double-pipe structure that includes an outer tube and an inner tube and is extendable in the longitudinal direction is formed in the middle of the strut. In the support apparatus of the offshore wind power generation facility in any one of Claims 1-4,
A support device for offshore wind power generation equipment, wherein the strut is rotatably connected to the leg. Three or more legs whose lower ends are fixed to the seabed; a top member that supports the power generator and to which the upper ends of the legs are respectively connected; struts that extend horizontally by connecting intermediate portions of the adjacent legs; A method of designing a support device for an offshore wind power generation facility, comprising:
A first stage of setting an initial shape of the support device, performing an eigenvalue analysis of the support device, and adjusting the leg and the strut until the eigenvalue analysis is out of a resonance range;
Performing a cross-sectional calculation of the support device, performing an eigenvalue analysis of the support device, and adjusting the leg and the strut until the eigenvalue analysis is out of a resonance range, and
In the adjustment of the leg and the strut in the first stage and the second stage,
First, change the arrangement of the legs, if within the leg gradient limit, perform eigenvalue analysis of the support device based on the changed arrangement of the legs,
As a result of the arrangement change, when the slope limit of the leg is exceeded, the struts are adjusted, and the eigenvalue analysis of the support device is performed based on the adjusted struts. Device design method.   A power generator, three or more legs whose lower ends are fixed to the seabed, a top member that supports the power generator and to which the upper ends of the legs are respectively connected, and an intermediate portion between adjacent legs is connected horizontally. An offshore wind power generation facility, comprising:

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