KR101509507B1

KR101509507B1 - Substructure of offshore wind turbine having multi-cylinders of various diameters, and constructing method for the same

Info

Publication number: KR101509507B1
Application number: KR20140058430A
Authority: KR
Inventors: 박민수; 정연주; 유영준; 황윤국
Original assignee: 한국건설기술연구원
Priority date: 2014-05-15
Filing date: 2014-05-15
Publication date: 2015-04-10

Abstract

A substructure of an offshore wind turbine having multi-cylinders of various diameters and a constructing method thereof are provided to effectively reduce the wave power working on the substructure through an interaction between the substructure of an offshore wind turbine and waves by establishing a central pile and a number of surrounding piles near the surface of the sea, to increase the hardness and safety of the substructure by increasing the number of central pile and surrounding piles, to make the method of establishment and construction very simple by establishing a gravity-type circular cylinder substructure first and then establishing a central pile and surrounding piles in the form of the conventional mono-pile, to reduce construction costs on the sea since establishment on the sea without large equipment is possible, to reduce working hours by establishing a gravity-type circular cylinder substructure first on the sea bottom and letting it serve as an establishment guide for central pile and surrounding piles, to enhance the accuracy of position control, and to easily prevent bending of piles in case of pile driving.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offshore wind turbine support structure having multiple cylinders of various diameters,

[0001] The present invention relates to an offshore wind power support structure, and more particularly, to a support structure for installing an upper structure made of a tower, a nacelle and a blade on an overhead structure for offshore wind power generation, The present invention relates to an offshore wind power support structure having multi-cylinders of various diameters so as to reduce wave forces, and a construction method thereof.

Generally, a wind turbine generator that generates electricity using wind is constructed so that a blade (or a propeller) is installed on a rotary shaft of a generator to generate power by using rotational force generated as the blade rotates by the wind. Such a wind turbine is a device for converting wind energy into electric energy, usually composed of a blade, a transmission, and a generator, and rotates a blade of a wind turbine, and generates electric power by rotating the blade.

Here, the blade is a device for converting wind energy into mechanical energy by being rotated by the wind, and the transmission device transmits the rotational force generated by the blade to the transmission gear through the central rotation axis and increases to the rotation speed required by the generator, The generator is a device that converts the mechanical energy generated by the blade into electric energy.

Such a wind turbine is easy to operate and manage because it is simple in its structure and installation, and can be unmanned and automated. In the past, wind power structures were mainly located on land, but due to problems such as wind resource capacity, aesthetics, and location constraints, it is in recent trends to build a large scale wind farm on the sea. However, in order to construct a wind turbine structure safely at sea, a safe installation method for a blade and a tower structure to be installed in a high position is required.

In other words, such a wind turbine generator is a device configured to convert kinetic energy by wind into electric energy, and can be classified into onshore and offshore depending on the environmental conditions to be installed. In addition, there are various methods of installing such a pile or a pile, such as a pneumatic type, a hydraulic pressure type, and a suction type. In order to install a large diameter file or pile, it is necessary to install the pile in a vertical direction.

It is the role of the tower to position the nacelle capable of generating wind at a given height to achieve the desired and desired power from such a wind turbine. In recent years, the development and installation of a horizontal type wind turbine has been actively carried out in domestic and overseas.

On the other hand, the offshore wind power generation structure is largely divided into a turbine and a support structure. In this case, the turbine basically applies the same technology as a terrestrial wind turbine. These offshore wind power structures have a life span of about 20 years, and wind turbines of 3 ~ 5MW or more, which are larger than those on land, are applied. Each component of this offshore wind power structure can be designed and coated to prevent corrosion damage due to salinity. For example, the support structure may be a mono-pile type, a concrete caisson type, a jacket type, a tripod type, and a floating type. ), And gravity type, monophasic type, jacket type and tripod type are fixed support structures.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the kind of a fixed offshore wind power generating support structure. Fig.

As shown in FIG. 1, the mono-file type 10 is the most popular type of offshore wind farm currently used and can be installed at a depth of 25 to 30 m. For example, Horns Rev and North Hoyle offshore wind farms have been applied to fix large diameter piles on the sea floor by hammering or drilling, Is 3 to 3.5 m in diameter, and is economically advantageous when used in a large-scale complex.

As shown in FIG. 1, the concrete caisson type is a gravity type 20, which is easy to manufacture and install and is used in an early offshore wind power generation complex. The type of the concrete caisson type is Vindeby, Middelgrunden Wind turbines, and so on. This gravity equation (20) can be used at relatively shallow depths of 6 to 10 m, with a base diameter of 12 to 15 m, and maintains its position by its frictional force with its own weight and seabed.

Also, as shown in FIG. 1, the jacket type 30 is a type that is currently showing great interest in the owner of the offshore wind farm, and can be installed at a water depth of 20 to 80 m. The jacket type (30) is supported by a jacket type structure and fixed to the sea floor by piles or piles. The jacket type 30 is a structure of a large water depth ocean, has high performance and high reliability, and is advantageous in that it is economically advantageous when used in a large-scale complex composition like the monophasic formula 10 described above.

As shown in FIG. 1, the tripod equation 40 is obtained by extending the above-described monophasic equation 10 downward and can be installed at a depth of 20 to 80 m. Such a tripod type (40) is characterized in that it does not need to clean the floor and uses a small diameter file, but an anchor file is required, which increases the manufacturing cost.

On the other hand, marine wind power generation has attracted much attention as a pollution-free new and renewable energy source due to recent environmental pollution, greenhouse effect, and the like. In addition, due to the large amount of offshore wind energy and the possibility of using infinite energy source, the market of offshore wind turbine is getting bigger and the output power of offshore wind turbine for installing a large-scale offshore wind turbine is also increasing.

However, as the output power of the offshore wind power generator increases, the size of the towers, rotor nacelle and blades of the generator increases, and the size of the fixed support structure for supporting them increases proportionally . 2 is a diagram illustrating the relationship between a turbine rated output and a rotor diameter.

On the other hand, the wave force acting on the offshore wind power support structure is greatly influenced by its size. For example, when the size of the above-mentioned fixed support structure increases and the area of the support structure contacting the sea surface increases, As the wave power increases, the safety of the support structure against the conduction moment is greatly reduced.

3 is a view for explaining an external force acting on an offshore wind power generating supporting structure.

As shown in FIG. 3, the offshore wind power support structure is installed on the sea, unlike the existing onshore wind power support structure, and thus is greatly influenced by external forces such as waves, algae, and wind.

Also, as the output power of the offshore wind power generator increases, the size of the tower and the rotor nacelle of the generator increases, and the size of the support structure for supporting the tower is increasing. That is, as the size of the large capacity offshore wind power support structure increases, the safety of the support structure decreases due to the increase in the wave force acting on the stationary support structure, for example, the gravity support structure and the monofile support structure according to the related art There is a problem.

Accordingly, as the size of the fixed support structure increases, the production cost, transportation cost, and installation cost increase exponentially. Also, since a large-sized floating crane is required, installation problems due to installation capacity of the installation equipment may occur.

Meanwhile, FIG. 4 is a photograph showing a state in which a mono file is coupled to a jack-up leg.

4, a mono-file support structure according to the prior art is coupled to, for example, a jack-up pant 50 to allow the monofilament 60 to flex during maritime installation .

Korean Unexamined Patent Publication No. 2013-61457 (Published on June 11, 2013), entitled " Substructure for Offshore Wind Power Generation and Installation Method " Japanese Laid-Open Patent No. 2011-137365 (Published on July 14, 2011), entitled "Method of Construction of Foundation Structure in Wind Power Generation Facilities" Japanese Unexamined Patent Application Publication No. 2007-120470 (Publication Date: May 17, 2007), entitled "Fundamental Structure of Offshore Wind Power Generation Device and Method of Establishing Fundamental Structure of Offshore Wind Power Generation Device & Japanese Unexamined Patent Publication No. 2006-322400 (Published on November 30, 2006), entitled "Gravity Basis of Offshore Wind Power Generation System" Japanese Unexamined Patent Publication No. 2006-46013 (Published on Feb. 16, 2006), entitled "Monophasic Fundamental Structure of Wind Power Generation Facilities" Japanese Unexamined Patent Publication No. 2005-180239 (published on July 7, 2005), entitled "Basis of offshore wind power generation apparatus" Korean Patent No. 10-1171201 filed on December 26, 2011, entitled "Offshore wind power structure using steel pipe pile foundation and prefabricated structure and method of construction thereof"

Technical Solution According to an aspect of the present invention, there is provided a method of reducing a wave which acts on a support structure by interactions between a support structure and a wave by installing a center file and a plurality of peripheral files near the sea surface, , An offshore wind power support structure having multiple cylinders of various diameters, and a construction method thereof.

It is another object of the present invention to provide a method and apparatus for improving the safety of a support structure by increasing the number of the center files and the peripheral files, which are small circular cylinders, And a method of constructing the same.

Another object of the present invention is to provide a method for installing a gravity type circular cylinder supporting structure and a small circular cylinder in which a center file and peripheral files are sequentially installed, And a method of constructing the same.

Another object of the present invention is to provide a multi-cylinder multi-cylinder having various diameters, which can perform a role as a guide for installing a gravity type circular cylinder supporting structure in a seabed ground, And a method for constructing the same.

As a means for achieving the above technical object, an offshore wind power support structure having multiple cylinders of various diameters according to the present invention is characterized in that an offshore wind turbine for supporting offshore wind power for installing an upper structure made up of a tower, a nacelle, A gravity support structure comprising: a large diameter circular cylinder mounted on a seabed surface by being dipped down on a ground in an installation area; A gravity type support structure comprising: a plurality of small-diameter circular cylinders disposed on an outer circumferential surface of the large-diameter circular cylinder so as to be installed on a seabed surface together with the large-diameter circular cylinder; A center file coupled to the large diameter circular cylinder and installed near the sea surface; A plurality of peripheral files disposed to surround the central file and each coupled to the plurality of small-diameter circular cylinders and installed near the sea level; And a transition piece connected to the central file and the peripheral file, wherein the central file and the surrounding file interact with the central file and the surrounding file by interactions between waves near the sea level, Thereby reducing the wave power.

Here, the large diameter circular cylinder and the small diameter circular cylinder serve as guides of the center file and the surrounding files when the center file and the peripheral files are installed to prevent the center file and the peripheral files from being bent.

Here, a concrete charging file in which concrete is injected into the center file and the surrounding files, the center file and the surrounding files may be a steel pipe file having a diameter of 3 m or less.

Here, the center file and the surrounding files may be installed at a height of 25% or more and 50% or less of the entire installed sea area.

Here, the large-diameter circular cylinder and the small-diameter circular cylinder, which are the gravity type support structures, can prevent undersea ground shrinkage around the gravity type support structure by reflecting the incident fluid and widening the radius of rotation of the fluid diffracted to the gravity type support structure .

According to another aspect of the present invention, there is provided a method of constructing an offshore wind power support structure having multiple cylinders of various diameters according to the present invention, The method comprising the steps of: a) fabricating a gravity support structure on land, comprising a large diameter circular cylinder and a plurality of small diameter circular cylinders; b) transporting the gravity support structure to the installation area and floating it; c) lowering and submerging the gravity support structure in the installation area; d) attaching a center pile on the large diameter circular cylinder of the gravity support structure; e) attaching a peripheral file to each of the small diameter circular cylinders of the gravity support structure; And f) connecting a transition piece to the top of the central file and the surrounding file, wherein the center file and the surrounding file reduce the wave acting on the center file and the surrounding file by interaction between the waves near the sea level .

According to the present invention, by installing a center file and a plurality of peripheral files in the vicinity of the sea surface, the wave acting on the support structure can be efficiently reduced by the interaction between the support structure and the wave.

According to the present invention, since the wave acting on the supporting structure does not increase in proportion to the number of the central files and the peripheral files, which are small circular cylinders, and in the short wavelength region, By increasing the number of files, the rigidity of the supporting structure can be increased to enhance the safety of the supporting structure.

According to the present invention, by installing the gravity type circular cylinder supporting structure and the small circular cylinder, the center file and the surrounding files in sequence, that is, the gravity type circular cylinder supporting structure is installed first and the center file, Because it is installed in the file format, the installation and construction method is very simple, and thus it is possible to install the marine installation without large-scale marine equipments, thereby reducing the cost of marine construction.

According to the present invention, the gravity type circular cylinder supporting structure is first installed on the seabed sole, and serves as an installation guide for the center pile and the peripheral pile, which are small circular cylinders, thereby shortening the working time and improving the accuracy of the position control And it is also possible to easily prevent the bending phenomenon of the center pile caused by hitting.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the kind of a fixed offshore wind power generating support structure. Fig.
2 is a diagram illustrating the relationship between a turbine rated output and a rotor diameter.
3 is a view for explaining an external force acting on an offshore wind power generating supporting structure.
4 is a photograph showing a state in which a mono file is coupled to a jack-up leg.
FIG. 5 is a view showing an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention formed as a hybrid support structure.
6 is a view showing that an offshore wind power support structure having multiple cylinders of various diameters according to an embodiment of the present invention is provided with a plurality of small diameter circular cylinders and peripheral files.
7 is a diagram illustrating how a gravity support structure in an offshore wind power support structure with multi-cylinders of various diameters according to an embodiment of the present invention changes the flow of fluid in the seabed to prevent scouring of the seabed.
FIG. 8 is a diagram illustrating reduction of wave power by a peripheral pile combined with a small-diameter circular cylinder in an offshore wind power support structure having multiple cylinders of various diameters according to an embodiment of the present invention.
9 is a vertical cross-sectional view of an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention.
10 is a graph showing changes in wave power according to a ratio of a depth of a mounting area to a height of a small circular cylinder in an offshore wind power generating supporting structure having multi-cylinders of various diameters according to an embodiment of the present invention.
FIG. 11 is a diagram illustrating wave power comparisons according to changes in diameter of a center cylinder in an offshore wind power support structure having multiple cylinders of various diameters according to an embodiment of the present invention.
FIG. 12 is a graph showing a change in the number of piles near a sea surface in an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention.
13 is a flowchart illustrating a method of constructing an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention.
FIGS. 14A to 14F are views for explaining a method of constructing an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Offshore Wind Turbine Supporting Structure (100) Having Multiple Cylinders of Various Diameters)

5 is a view showing that an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention is formed as a hybrid support structure, and Fig. 6 is a cross- Is provided with a plurality of small diameter circular cylinders and peripheral files.

5 and 6, an offshore wind power support structure 100 having multiple cylinders of various diameters according to an embodiment of the present invention includes a large diameter circular cylinder 110, a small diameter circular cylinder 120, A Center Pile 130, a Peripheral Pile 140, and a Transition Piece 150.

First, an offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention is a hybrid support structure in which a gravity type support structure and a monophasic file are combined. As shown in the left side of FIG. 5 Likewise, the large diameter circular cylinder 110 and the center pile 130, which are different in the diameter of the upper portion and the diameter of the lower portion, are constituted as one basic supporting structure, and as shown in the right side of FIG. 5, By connecting the small diameter circular cylinder 120 and the peripheral file 140 to the large diameter circular cylinder 110 and the center pile 130 respectively, the support structures 110 and 130 having a large diameter are arranged at the center, And is surrounded by support structures 120 and 140 having a small diameter.

At this time, the large diameter circular cylinder 110 and the center pile 130, which are different in the diameter of the upper portion and the diameter of the lower portion, can be joined individually and not integrally. 4, the conventional file support structure is coupled to the jack-up pants 50 to prevent the file 60 from being bent during installation. can do.

In other words, an offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention is characterized in that gravity type support structures 110 and 120 are installed in the seabed ground in advance and the gravity type support structures 110 120 serve as a guide for the center and peripheral files 130 and 140 when the center and peripheral files 130 and 140 are installed so that the cause of bending of the center and peripheral files 130 and 140 can be prevented .

5, an offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention includes an upper structure made up of towers, nacelles, and blades for offshore wind power generation A plurality of small diameter circular cylinders 120, a center pile 130, a plurality of peripheral piles 140, and a transition piece 140. The large diameter circular cylinder 110, the small diameter circular cylinder 120, (Transition Piece: 150).

The large diameter circular cylinder 110 is a gravity type support structure that is installed on the sea floor by sinking down on the ground 210 in the installation area and a plurality of small diameter circular cylinders 120 are gravity type support structures, Diameter circular cylinder 110 so as to be installed on the bottom of the sea.

Here, the large diameter circular cylinder 110 and the small diameter circular cylinder 120 are weight supporting structures similar to conventional gravity type support structures, and the center files 130 and the peripheral files 140 The central file 130 and the peripheral file 140 are prevented from being bent during the installation of the central file 130 and the peripheral file 140. Also, And the surrounding files 140 to serve as a base for supporting the offshore wind power support structure.

A center file 130 is coupled to the large diameter circular cylinder 110 and is installed near the sea surface and a plurality of peripheral files 140 are disposed to surround the center file 130, (120) and are installed near the sea surface.

The center file 130 and the plurality of peripheral files 140 serve as a file installed on the ground like a conventional mono file as an offshore wind power generation supporting structure and also serve as a top structure such as a tower and a rotor nacelle, Resists the compressive force of the bridge 160 and partially resists the conduction moment and the bending moment and maintains the verticality of the entire structure. The central file 130 and the plurality of peripheral files 140 are installed in the vicinity of the sea surface to reduce the wave acting on the supporting structure due to the interaction between the incident wave and the central file 130 and the plurality of peripheral files 140 .

The transition piece 150 is connected to the center file 130 and the peripheral file 140 as an intermediate connection part with the upper structure 160. That is, the transition piece 150 is an intermediate connection part with the upper structure 160, and is installed while adjusting the verticality of the transition piece 150. At this time, a grouting operation is performed to fill the concrete between the transition piece 150 and the center file 130 and the surrounding file 140. Through the grouting operation, the transition piece 150 moves to the center file 130 and / And is installed vertically at the upper portion of the peripheral file 140.

In the offshore wind power generator supporting structure 100 having multiple cylinders of various diameters according to the embodiment of the present invention, the center pile 130 is formed in a center corresponding to the large diameter circular cylinder 110, The peripheral file 140 is formed to correspond to the number of the plurality of small diameter circular cylinders 120 and is formed so as to correspond to one central file 130 and four peripheral The hybrid support structure 100a having the file 140 may be a hybrid support structure 100a having one central file 130 and six peripheral files 140 as shown in Figure 6b) Structure 100b and may be a hybrid support structure 100c having one central file 130 and seven peripheral files 140 as shown in Figure 6c.

The offshore wind power generating support structure 100 having multi cylinders of various diameters according to the embodiment of the present invention is provided with gravity type circular cylinders 110 and 120 having a large diameter in the vicinity of the sea floor, By installing the center file 130 and the surrounding file 140, the center file 130 and the neighboring file 140 are mounted on the ground like a conventional mono file to perform a file function. Accordingly, the center file 130 and the surrounding file 140 can reduce the wave acting on the support structure due to the interaction between the support structure and the wave near the sea level.

Meanwhile, FIG. 7 is a view illustrating a gravity type support structure in an offshore wind power generating supporting structure having multi-cylinders of various diameters according to an embodiment of the present invention to change the flow of fluid in the seabed to prevent scouring of the seabed And FIG. 8 is a diagram illustrating the reduction of wave power by a peripheral file coupled with a small-diameter circular cylinder in an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention.

The offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention is configured such that the gravity type support structures 110 and 120 are installed in a conventional gravity type support structure And the stability of the support structure can be improved by increasing the number of the small-diameter circular cylinders 120 in the periphery. Also, as shown in Figure 7b), a plurality of circular cylinders, gravity support structures 110 and 120, reflect incoming fluids and increase the radius of rotation of the fluid diffracting to gravity support structures 110 and 120 It is possible to prevent undersea ground shrinkage around the gravity type supporting structures 110 and 120, thereby enhancing the safety of the gravity type supporting structures 110 and 120 and effectively preventing the seabed ground shoring. That is, in the fluid flow diagram 170 of FIG. 7 (b), the small supporting structure located at the front of the fluid flow reflects the incident fluid to widen the rotation radius of the fluid diffracting to the gravity supporting structures 110 and 120, It is possible to prevent submarine ground shrinkage around the gravity type supporting structures 110 and 120.

As shown in FIG. 8, the offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention has a diameter (diameter) smaller than that of the large diameter and small diameter circular cylinders 110 and 120 The small central file 130 and the peripheral file 140 are placed on the large diameter and small diameter circular cylinders 110 and 120 which are gravity type supporting structures with a length h of one quarter or less of the entire depth d It is possible to reduce the wave power or improve the resistance to external force by using the interaction between the incident wave and the center file 130 and the plurality of peripheral files 140. At this time, Since the surrounding file 140 is filled with concrete, and the file function is performed by hitting the ground, the stability of the support structure can be enhanced because the rigidity is superior to that of the monofile of the same size.

FIG. 9 is a vertical cross-sectional view of an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention. FIG. 10 is a vertical cross-sectional view of an offshore wind power support structure having multiple cylinders of various diameters according to an embodiment of the present invention. This diagram shows the change of the wave power according to the ratio of the depth of the installation area to the height of the small circular cylinder in the power generation support structure.

As shown in FIG. 9, an offshore wind power support structure 100 having multi-cylinders of various diameters according to an embodiment of the present invention may be formed by dipping on the ground 210 in the installation area.

If the depth of the installation area is d and the height of the center pile 130 as a small circular cylinder is h and the diameter of the center pile 130 is b, For example, as shown in FIG. 10, the height h of the center pile 130 is represented by (h / d) In the case of 25% or more and 50% or less of the total installed sea depth d, the offshore wind power support structure 100, i.e., the hybrid support structure having multi-cylinders of various diameters according to the embodiment of the present invention, It can be confirmed that the effect of reducing the wave power is very superior to that of the mono file according to the present invention.

11 is a view showing a comparison of the wave power according to the diameter change of the center cylinder in the offshore wind power generating support structure 100 having multi cylinders of various diameters according to the embodiment of the present invention, FIG. 5 is a graph showing the change in the wave power according to the number of piles near the sea surface in an offshore wind power support structure having multiple cylinders of various diameters according to the example.

11 is a graph showing a change in wave power with respect to a change in diameter of a center pile 130 installed in the center of a small circular cylinder near the sea surface. For example, when the diameter of the center pile 130 located at the center is 3 m or less, It can be confirmed that the effect of reducing the wave power is superior to that of the monofile according to the technology.

12 shows a comparison of the waves of power according to the number of the peripheral files 140 installed around the small circular cylinders near the sea level. For example, as the number of the surrounding files 140 increases, In contrast, in the short wave region, the wave power was decreased. In addition, in all cases, the wave power reduction effect was superior to that of the conventional mono file.

In the case of an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention, a gravity support structure, i.e., a large diameter circular cylinder 110 and a plurality of small diameter circular cylinders 120, After flooding to the installation area, it is submerged in the installation area. Thereafter, the center file 130, which is a small circular cylinder, is installed on the large diameter circular cylinder 110 and the peripheral files 140 are respectively installed on the small diameter circular cylinder 120, And the surrounding files 140 are installed as far as the ground 210 separately and are operated as files in the same manner as the conventional mono file installation method.

Accordingly, in the offshore wind power generating support structure 100 having multi-cylinders of various diameters according to the embodiment of the present invention, the large-diameter and small-diameter circular cylinders 110 and 120 of the gravity support structure are installed in the center pile 130, And the surrounding file 140, thereby preventing the center file 130 and the surrounding file 140 from being bent during installation of the hanger.

In addition, the offshore wind power support structure 100 having multi-cylinders of various diameters according to the embodiment of the present invention is very simple in installation and construction method because the monofilament method according to the conventional technology is applied similarly, In this case, since the center pile 130 having a diameter of 3 m or less can be used, it is possible to construct a small sized marine equipment without a large marine equipment, thereby greatly reducing the construction cost.

[Method of constructing an offshore wind power support structure having multiple cylinders of various diameters]

FIG. 13 is a flowchart illustrating a method of constructing an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention. FIGS. 14A to 14F are cross- The present invention relates to a method for constructing an offshore wind power generation supporting structure having a plurality of wind turbines.

13 and 14A to 14F, a method of constructing an offshore wind power support structure having multi-cylinders of various diameters according to an embodiment of the present invention includes a large-diameter circular cylinder 110 and a plurality of small- A gravitational support structure consisting of a circular cylinder 120 is produced on land (S110). The large diameter circular cylinder 110 and the small diameter circular cylinder 120 may be formed at the time of installation of the center file 130 and the peripheral files 140 to prevent bending of the center file 130 and the peripheral files 140. [ And may serve as a guide for the center file 130 and the surrounding files 140. [

Next, the gravity type supporting structures 110 and 120 are carried to the installation area and floated (S120). For example, the gravity type supporting structures 110 and 120 are transported to the installation area using a barge, and the gravity type supporting structures 110 and 120 are lifted using a lifting device such as a crane.

Next, the gravity type supporting structures 110 and 120 are lowered and flooded down to the installation area (S130). For example, the gravity type supporting structures 110 and 120 are descended and flooded to the installation area using a crane.

Next, the center pile 130 is coupled to the large diameter circular cylinder 110 of the gravity type support structure (S140).

Next, the peripheral pile 140 is coupled to each of the small diameter circular cylinders 120 of the gravity type support structure (S150). The center file 130 and the surrounding file 140 may be a steel pipe file having a diameter of 3 m or less and the center file 130 and the surrounding file 140 may be 25 Or more and 50% or less of the height (h). Also, concrete may be injected into the center file 130 and the surrounding file 140 so that the center file 130 and the surrounding file 140 become a concrete filled pile.

Next, a transition piece 150 is connected to the upper portion of the center file 130 and the peripheral file 140 (S160). Subsequently, an upper structure 160 such as a tower is installed on the transition piece 150.

As a result, in the case of a monofile or gravity type support structure according to the prior art, as the diameter of the support structure increases, the wave acting on the support structure also increases, but the hybrid support structure 100 according to the embodiment of the present invention is located near the sea surface By providing a plurality of central files 130 and surrounding files 140, the interaction between the support structure and the wave can effectively reduce the wave force acting on the support structure.

In addition, the hybrid support structure 100 according to the embodiment of the present invention does not increase the wave force acting on the support structure in proportion to the number of the center files 130 and the peripheral files 140, which are small circular cylinders, The number of the center files 130 and the peripheral files 140, which are small circular cylinders, can be increased to increase the rigidity of the supporting structure, thereby enhancing the safety of the supporting structure.

In addition, most of the offshore wind power generation supporting structures such as mono-file, gravity type, jacket type and the like according to the related art are integrally manufactured and installed on the sea. Therefore, in order to install the support structure on the sea, In the case of the hybrid support structure 100 according to the embodiment of the present invention, the gravity type circular cylinder supporting structures 110 and 120 are installed first and the center file 130, which is a small circular cylinder, And the surrounding files 140 are installed in the conventional mono file format, the installation and construction method is very simple, and therefore, the marine installation can be installed without a large marine equipment, thereby reducing the marine construction cost.

In the case of the hybrid support structure 100 according to the embodiment of the present invention, the gravity type circular cylinder supporting structures 110 and 120 are first installed on the seabed ground 210 to form a center circular cylinder 130 and a peripheral file 140 can be shortened, the accuracy of position control can be improved, and the bending phenomenon of the center pile 130, which is generated at the time of hovering, can be easily prevented.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Offshore wind power support structure with multiple cylinders of various diameters
110: Large diameter circular cylinder (gravity type support structure)
120: Small diameter circular cylinder (gravity type support structure)
130: Center Pile
140: Peripheral Pile
150: Transition piece
160: superstructure
170: Fluid flow around gravity support structure
210: Ground

Claims

An offshore wind force supporting structure for installing an upper structure made up of a tower, a nacelle and a blade for offshore wind power generation,
A gravity type support structure comprising: a large-diameter circular cylinder (110) installed on a seabed surface by being dipped down on a ground (210) in an installation area;
A gravity type support structure comprising: a plurality of small diameter circular cylinders (120) arranged on an outer circumferential surface of the large diameter circular cylinder (110) so as to be installed on the sea floor together with the large diameter circular cylinder (110);
A center pile 130 coupled to the large diameter circular cylinder 110 and installed near the sea surface;
A plurality of peripheral piles (140) arranged to surround the center pile (130), respectively coupled to the plurality of small pile diameter cylinders (120) and installed near the sea level; And
A transition piece 150 connected to the center pile 130 and the peripheral pile 140 as an intermediate connection part with the upper structure 160,
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Wherein the central file (130) and the peripheral file (140) reduce wave forces acting on the central file (130) and the peripheral file (140) by interaction between waves near the sea level. Equipped offshore wind power support structure.

The method according to claim 1,
The large diameter circular cylinder 110 and the small diameter circular cylinder 120 may be formed in the same manner as the large diameter circular cylinder 110 and the small diameter circular cylinder 120 when the center pile 130 and the peripheral pile 140 are installed to prevent the center pile 130 and the peripheral pile 140 from being bent. Wherein the guide member serves as a guide for the center file and the surrounding files.

The method according to claim 1,
Wherein the concrete file is a concrete fill pile into which the concrete is injected into the center file (130) and the surrounding file (140).

The method of claim 3,
Wherein the center file (130) and the peripheral file (140) are steel pipe files of 3 m or less in diameter.

The method according to claim 1,
Wherein the center file (130) and the peripheral file (140) are installed at a height (h) of 25% or more and 50% or less of the total installed sea area depth (d) Wind power support structure.

The method according to claim 1,
The large diameter circular cylinder 110 and the small diameter circular cylinder 120 which are the gravity type supporting structures reflect the incident fluid to widen the rotation radius of the fluid diffracted to the gravity type support structures 110 and 120, 110, 120) of the offshore wind turbines is prevented. The present invention relates to an offshore wind power support structure having multiple cylinders of various diameters.

A method for installing an offshore wind power supporting structure for installing an upper structure made up of a tower, a nacelle and a blade for offshore wind power generation,
a) fabricating a gravity support structure on land, comprising a large diameter circular cylinder (110) and a plurality of small diameter circular cylinders (120);
b) transporting the gravity support structure (110, 120) to the installation area and floating it;
c) lowering and submerging the gravity support structure (110, 120) in the installation area;
d) attaching a center pile (130) on the large diameter circular cylinder (110) of the gravity type support structure (110, 120);
e) attaching a peripheral file (140) to each of the small diameter circular cylinders (120) of the gravity support structure (110,120); And
f) connecting a transition piece (150) to the top of the central file (130) and the peripheral file (140)
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Wherein the central file (130) and the peripheral file (140) reduce wave forces acting on the central file (130) and the peripheral file (140) by interaction between waves near the sea level. A method of constructing an offshore wind power support structure.

8. The method of claim 7,
The large diameter circular cylinder 110 and the small diameter circular cylinder 120 of the step a) may be arranged to prevent the center file 130 and the peripheral files 140 from being bent to prevent the center files 130 and the peripheral files 140 from being bent. Wherein the guide member is a guide for the center pile (130) and the peripheral pile (140) at the time of installation.

8. The method of claim 7,
Wherein the concrete is injected into the center file (130) and the surrounding file (140) after the step (e) so that the concrete file is a concrete filled pile. Construction method of power generation support structure.

10. The method of claim 9,
Wherein the center file (130) and the peripheral file (140) are steel pipe files having a diameter of 3 m or less.

8. The method of claim 7,
Wherein the center file (130) and the peripheral file (140) are installed at a height (h) of 25% or more and 50% or less of the total installed sea area depth (d) Construction method of wind power support structure.

8. The method of claim 7,
The large-diameter circular cylinder 110 and the small-diameter circular cylinder 120, which are the gravity type support structures in the step a), enlarge the radius of rotation of the fluid diffracting to the gravity type support structures 110 and 120 by reflecting the incident fluid, Wherein the bottom surface of the gravity support structure (110, 120) is prevented from subgingling.