KR102521885B1 - Offshore wind farm structure installed by jacking method and its construction method - Google Patents

Abstract

The present invention has a ballast tank and moves the power generation turbine and tower to the upper side of the floating movable body through a tugboat in a pre-assembled state at the pier, but uses a temporarily installed jack-up device to lower the leg and install on the seabed rock layer and It relates to an offshore wind power structure in which a leveling operation is performed and a construction method thereof.

Description

Offshore wind farm structure installed by jacking method and its construction method {Offshore wind farm structure installed by jacking method and its construction method}

The present invention relates to an offshore wind power generation structure, and more specifically, to a floating movable body having a ballast tank and moving a turbine and a tower for power generation pre-assembled at a pier to the sea using a tugboat and using a temporarily installed jack-up device It relates to an offshore wind power generation structure and a construction method thereof, in which installation and leveling work are performed on a seabed rock layer by lowering a leg.

Recently, as the environmental pollution problem caused by fossil fuels has become serious, a lot of research and development on eco-friendly renewable energy is being conducted. Electric power is produced through a structure that installs generators and auxiliary equipment on top of the tower.

These wind power generators basically require a relatively large installation space as large blades are exposed to the outside, and in particular, to produce a desired amount of power, a number of wind turbines must be installed at a certain distance, so there are restrictions on securing an installation place. will follow

In particular, as the noise generated during high-speed rotation of large blades and generator operation noise become a cause of civil complaints, it is inevitable to install them on the outskirts away from the city center. A project to solve these problems by constructing a wind power generation structure on the sea is being reviewed. there is.

As the offshore wind power generation structure basically needs to be fixed firmly against the movement of wind, storm and tide, in the past, a method of supporting the tower by pouring concrete to create a support was used, but in recent years more power To secure it, the size of the offshore turbine also increases, and there is a difficulty in requiring installation on the deeper seabed.

Therefore, a lot of consideration has been given to piling to block piles after excavating rock layers on the seabed in a way that is mainly used for offshore structures for oil and gas extraction so that structures of considerable height can withstand loads applied from multiple directions.

However, in a situation where dozens or hundreds of wind power generation structures are required to obtain the desired power due to limitations in the generation capacity of individual turbines, each structure not only adversely affects the ground structure during piling work, but also requires excessive installation costs, which is practically This resulted in lower economic efficiency.

Republic of Korea Patent No. 10-1189681 (2012.10.04)

The present invention was created to solve the above problems, and an object of the present invention is to use a jack-up device temporarily installed after moving to the sea in a state in which a turbine and a tower for power generation are previously installed in a floating movable body at a pier To provide an offshore wind power structure and its construction method, which are installed in a jacking method that can protect the environment, improve construction convenience, and reduce costs by installing on the seabed rock layer.

The offshore wind power structure installed by the jacking method of the present invention for the above purpose is an offshore wind power structure for installing a wind turbine and a tower supporting the turbine on the sea, as a floating structure on the water, A main body having a plurality of leg supports penetrating in the vertical direction at intervals set to the side and having a tower and a wind turbine installed in the upper center; As a rod-shaped structure inserted into the leg support and capable of sliding in the vertical direction, a cone-shaped spud having a larger radius and then gradually smaller is formed at the lower end, and the main body located on the sea in a state where the spud is seated on the seabed rock layer. A plurality of legs manufactured to a height that can be supported; A structure that is detachable from the leg support part and is temporarily installed to cover some or all of the outside of the leg to lower or raise the leg, a fixing part that operates to allow or fix the leg to move in a vertical direction, and the fixing part A jacking means composed of a moving part that is spaced apart from the upper or lower side and moves in the vertical direction within a set range, and the leg and temporary coupling and disassembly are made, and an actuator that moves the moving part up and down; a fixing means installed in the leg support part and fixing the leg so that the leg does not move in a state in which the jacking means is removed; It is characterized in that it includes.

At this time, the main body may further include a level sensor for measuring horizontality, a ballast tank configured in the form of a compartment of a compartment set therein, and a pump unit for injecting seawater into the ballast tank or discharging seawater contained in the ballast tank. can

In addition, the jacking means monitors the drive source required for driving the actuator in a state in which the leg is moved downward, and the rock detection unit for determining the location of the spud by classifying it into a sedimentary clay layer, a sedimentary sand layer, weathered soil, and weathered rock can include more.

In addition, the main body includes a plurality of artificial reefs connected through connection means and installed on the sea floor, a tension sensor for measuring tension applied to the connection means, and power generated through the turbine to suck seawater It may further include a water electrolysis means for producing hydrogen by decomposition after the decomposition, and a hydrogen supply unit for temporarily storing and transporting the produced hydrogen.

In addition, a cylindrical suction pipe formed on the upper side while surrounding the spud and having an open lower side, and a pressure reducing unit for decompressing the inside of the suction pipe are provided, so that the soil is sucked into the lower side and the leg penetrates the soil layer to help move downward. suction means; may further include.

In addition, the construction method of the offshore wind power generation structure, which is installed by the jacking method of the present invention for the above purpose, prepares to assemble a tower and a wind turbine to the upper center of the main body on land, and insert and fix the leg to each leg support. step; Floating the prepared main body on the sea and moving it to the installation site; A jacking step of lowering the leg by coupling the jacking means to the leg support and seating it on the bedrock layer; A leveling step of individually raising and lowering the provided legs and adjusting the level of the main body; Removing the jacking means after fixing the legs inserted into each leg support according to the horizontal adjustment of the main body; It is characterized by consisting of.

The present invention does not require a separate installation tip and individual jack-up As the legs are installed and adjusted in this way, stable installation is possible even on the seabed with many curves and weak ground.

In particular, by using expensive hydraulic equipment for jack-up as a portable type, multiple installation and leveling operations can be performed with one set.

In addition, compared to the jacket method, which is inserted by drilling the ground through hammering, which was traditionally applied to offshore structures, the bottom of the leg is seated in the rock layer in the jack-up method, so there is no adverse effect on the ground or seabed environment and construction noise.

In addition, eco-friendly design conditions are created by utilizing the lower space of the main body to install hydrogen production and storage devices and high-rise artificial reefs, and it can greatly enhance the acceptance of local fishermen.

1 is a perspective view showing an external structure according to an embodiment of the present invention;
2 is a side view showing an installation structure according to an embodiment of the present invention;
3 is an operating state diagram showing an example of a jacking means applied to the present invention;
4 is a perspective view showing an internal structure according to another embodiment of the present invention;
5 is a side view showing an installation state according to another embodiment of the present invention;
6 is a process diagram showing an assembly, transportation, and installation method according to an embodiment of the present invention;
7 is a flowchart illustrating an assembly, transport, and installation method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, an offshore wind power generation structure and its construction method, which are installed by the jacking method of the present invention, will be described in detail.

1 is a perspective view showing an external structure according to an embodiment of the present invention, and FIG. 2 is a side view showing an installation structure according to an embodiment of the present invention, in which a wind turbine and a tower supporting the turbine are installed on the sea. As an offshore wind power structure for doing so, the main body 110, which is basically a floating structure on the water, is utilized.

The main body 110 has a flat shape in which a tower and a wind turbine are installed in the upper center, and as it is made of a structure that can float and move on the sea, the tower 102 and the wind turbine 101 are installed on the main body As it is moved by sea with pre-assembly and commissioning completed, it does not require a large offshore crane for assembling heavy components at sea and a fleet for its movement and operation as in the prior art.

To this end, the body 110 maintains buoyancy even when the tower 102 and the wind turbine 101 are installed on the top, and has an appropriate area so that it does not easily overturn even when wind or waves are applied from the front, rear, left, and right sides, but has appropriate stability. It may be provided with ballast to maintain and adjust draft and trim.

It can be manufactured in various forms, but in the embodiment of the present invention, the main body is configured so that the plane has a triangular shape in consideration of stability and economic feasibility according to sea installation as well as mobility from land to sea.

At this time, a plurality of leg support parts 111 penetrating in the vertical direction at set intervals are formed on the edge side of the main body 110. In the embodiment of the present invention, as the main body 110 is formed in a triangular shape, a total of three leg support portions 111 are formed for each vertex portion, and if the main body has a quadrangular shape, four An appropriate number of leg supports may be provided so that the legs can be stably seated on the sea floor later in correspondence with the shape of the main body, such as the formation of leg supports.

Legs 130, which are rod-shaped structures inserted to be slidable in the vertical direction, are installed in the leg support part 111, respectively. Likewise, the leg 130 is lowered downward after the body 110 is towed to the installation site in a state of being fitted into the body on land, so that the body 110 can be stably supported on the sea floor.

To this end, at the bottom of the leg 130, a cone-shaped spud 131 whose radius increases and then gradually decreases is formed to penetrate weak parts such as the sedimentary clay layer, the sedimentary sand layer, and weathered soil on the sea floor during descent, while descending in the reverse direction. It is composed of relatively difficult to fall into. In addition, the leg 130 is manufactured to have a height at which the main body 110 located on the sea can be firmly supported in a state in which the spud 131 is seated on the seabed rock layer, that is, the upper side of the weathered rock.

That is, the upper end of the leg 130 is set to have a sufficient length (height) so that it can protrude as much as the set length to the upper side of the leg support 111 in a state where the lower end of the leg 130 is seated on the seabed rock through a preliminary investigation of the installation location.

In addition, although the accompanying drawings show a leg having a circular cross-section as a preferred embodiment, the leg may be configured to have various cross-sections, such as a rectangle or a pentagon, if necessary.

In this way, in fixing the main body 110 by inserting the leg 130 into the leg support 111 and seating it on the bedrock layer, the main body 110 is maintained horizontally even in factors such as the curvature of the sea floor. The leg 130 is raised and lowered, and the lower end of the leg 130, that is, the spud 131 penetrates the accumulated clay, sand, weathered soil, etc., and the constructed leg 130 is fixed without moving. A jacking means 140 and a fixing means 150 are provided for doing so.

The jacking means 140 is a structure that is temporarily fixed to the leg support 111 of the main body 110 and moves the inserted leg 130 upward or downward, and is also partially used for construction of conventional offshore structures. It has been reviewed, and as a representative example, jacking means of rack-and-pinion method or cylinder-and-pin method have been provided in a special ship for installing a wind power generator.

In the present invention, the jacking means 140 is provided in a detachable form to the leg support 111 rather than being fixed to the main body so that the construction of the wind power generation structure is possible without the help of such a special wire, the leg 130 ) It is temporarily installed to cover part or all of the outer side and is configured to lower or raise the leg 130.

Currently, the power generation capacity of wind turbines is limited. For example, when creating a wind farm that requires power generation of 1 gigawatt, 200 wind turbines with a power generation capacity of 5 megawatts are required. There is a practical difficulty in providing all the expensive jacking means for every tens to hundreds of units of wind power generation structures.

Therefore, in the present invention, as the jacking means 140, which is temporarily used only for construction and leveling work, is configured to be temporarily installed and used in a state in which only the legs 130 are provided in the main body 110, a small number of three units are set as one set. Even through the configured jacking means 140, it is possible to construct a plurality of wind power generation structures, so that significant cost reduction can be achieved.

The jacking means 140 specifically includes a fixing part 141 and a moving part 142 and an actuator 143.

The fixing part 141 operates to allow or fix the leg 130 to move in the vertical direction in a fixed position state. That is, the first operation of fixing the leg 130 so that it does not move by being fixed on the outside of the leg 130 and contacting the leg 130 and the contact with the leg 130 being released, the leg 130 moves upward or downward. By selectively performing the second operation allowing the movement to be possible, as a representative method, the movement of the leg 130 can be restricted or allowed by configuring it to grab and fix the outside of the leg 130 like a vise.

The moving part 142 is located apart from the upper or lower side of the fixing part 141, but is installed so as to be movable up and down within a set range, and through the same principle as the fixing part 141, the leg ( 130) and temporary coupling and disassembly.

The actuator 143 is configured to move the moving unit 142 upward or downward, and may be configured in a cylinder shape whose length is adjusted in various ways such as electric, pneumatic, or hydraulic pressure.

Figure 3 is an operating state diagram showing an example of the jacking means applied to the present invention, the moving part 142 is located on the lower side of the fixing part 141 on the upper side, respectively, the fixing part 141 and the moving part 142 and the actuator Through the organic operation of (143), it shows how the leg 130 is moved to the lower side.

Based on the operation of lowering the leg 130 downward, first, the fixing part 141 fixes the leg 130 and the moving part 142 activates the actuator 143 in a state in which the fixation is released. In a state where the leg 130 is fixed, the moving part 142 rises. Thereafter, the moving part 142 is fixed to the leg 130, the fixing part 141 is released, and the actuator 143 is activated to lower the moving part 142 and the leg 130 fixed thereto. this is done Thereafter, the fixing part 141 fixes the leg 130 and the moving part 142 releases the fixing to return to an initial state. This procedure is repeated and the leg 130 is lowered. The rise of the leg 130 is naturally made according to the opposite procedure through the same configuration.

Specifically, attached FIG. 3 shows a state in which a cylinder-and-pin method is applied as an embodiment of the present invention.

To this end, pinholes 132 are formed in the upper and lower directions at set intervals in the leg 130, and each of the fixing part 141 and the moving part 142 is inserted into the pinhole 132 to form the leg 130. A pin 144 that restricts vertical movement and a cylinder 145 that moves the pin to be inserted into the pinhole 132 or driven to extract the pin 144 inserted into the pinhole 132 are provided.

In addition, as mentioned above, as the jacking means 140 is temporarily installed and operated in each leg support part 111, the fixing means 150 prevents the leg 130 from moving in the state where the jacking means 140 is removed. It is fixedly installed to the leg support 111 so as to be fixed.

The fixing means 150 may apply various known means in fixing the leg 130, and as mentioned above, it is configured to hold and fix the leg 130 in a vise structure, or the attached FIG. 3 By configuring the pin 144 and the cylinder 145 in the same manner as the jacking means 140 described through, it is possible to fix the leg 130 so as not to move even when the jacking means 140 is removed.

At this time, the main body 110 is floated on the sea and transported through a tug boat, and the horizontality of the main body 110 is measured along with the ballast tank 113 for maintaining the horizontality of the main body 110 and improving the restoring force when the installation work is performed at sea It is preferable that the horizontal detection unit 112 is installed to do so.

The leveling sensor 112 is a leveling sensor used in leveling devices of various equipment, and smooth leveling by confirming whether the main body 110 is level when the leg 130 is seated on the rock layer, including ballast work let the work be done

4 is a perspective view showing an internal structure according to another embodiment of the present invention, and a ballast tank 113 configured in the form of a compartment of a set compartment is formed inside the main body 110. This may vary depending on the shape of the main body 110, and in the embodiment of the present invention, as the main body 110 has a triangular shape, three ballast tanks 113 are provided so that the inclination toward each vertex can be adjusted. It is becoming.

In addition, a pump unit 114 and a valve for injecting seawater into the ballast tank 113 by installing a pipe communicating with seawater to the lower side of the main body 110 or discharging seawater contained in the ballast tank 113 to the outside will install

5 is a side view showing an installation state according to another embodiment of the present invention.

As mentioned above, in the operation of lowering the leg 130 to the rock layer through the jacking means 140, the depth of the sedimentary clay layer, the sedimentary sand layer, and the weathered soil to be located on the upper side of the rock layer, that is, the weathered rock, to be penetrated through a preliminary environmental investigation. After measuring , the work is performed, but since the bottom height of the seabed is not flat, it is necessary to check whether the spud reaches the bedrock layer.

To this end, the jacking means 140 monitors the driving source required to drive the actuator 143 in a state in which the leg 130 is moved downward, and the location of the spud 131 is deposited in the clay layer and the deposited sand layer. And it is preferable to further include a rock detection unit 146 for determining by classifying into weathered soil and weathered rock.

That is, the rock detection unit 146 measures the load applied as the actuator 143 moves the leg 130 to relatively determine whether it is easy or difficult for the leg 130 to penetrate. That is, in the case of a relatively soft soil such as a sedimentary clay layer, a sedimentary sand layer, and weathered soil, it can be penetrated relatively easily, so the load applied to the actuator 143 is relatively light, and the leg 130 cannot easily penetrate the rock layer such as weathered rock, so the actuator ( 143) is relatively large, and since the main body 110 is lifted up as a reaction to the lowering of the leg, whether or not the spud 131 reaches the rock layer is determined by the rock detecting unit 146 and the horizontal detecting unit ( 112) can be checked at sea.

In this way, the load applied to the actuator 143 can be recognized through a change in the input current value in the case of an electric actuator or a change in applied pressure in the case of a hydraulic or pneumatic actuator.

This configuration can suggest an optimized construction plan even in an environment where it is difficult to install offshore structures in the conventional way because there are many curves on the seabed, such as the west coast of Korea, and clay and sand layers are formed.

In addition, in the conventional offshore structure, the lower and subsea spaces could not be utilized, but in the present invention, as the space between and around the legs 130 can be utilized, the main body 110 is connected through the connecting means 122 A plurality of artificial reefs 121 installed on the seabed may be installed.

The artificial fish reef 121 is made of an eco-friendly design and is a configuration that helps spawning and proliferation of fish resources, and is an eco-friendly construction method to solve problems such as complaints and opposition from nearby fishermen due to the installation of offshore structures due to conventional environmental destruction. It brings about the effect of coexistence with fishermen through the formation of sea ranches.

Since the connection means 122 uses a chain or wire, a tension sensor 123 for measuring the tension applied to the connection means 122 is installed in the main body to be used for loss or repair of artificial reefs as well as leg It is also helpful to maintain the position of the main body 110 supported through the 130.

In addition, even though wind turbines produce continuous power while the wind blows, when power transmission has to be stopped for various purposes, such as maintenance of onshore facilities, or when the required load on land is low, the generated power is inevitably discarded. In order to solve this problem, in the present invention, in order to solve this problem, a water electrolysis means 124 for generating hydrogen by sucking and decomposing seawater through the power generated through the turbine, and a hydrogen supply unit 125 for temporarily storing and transporting the produced hydrogen may further include.

That is, eco-friendly clean hydrogen is produced by utilizing surplus power and seawater that can be obtained from the lower part of the body at all times. After producing hydrogen by applying a known technology to extract hydrogen by decomposing seawater such as anion exchange membrane seawater electrolysis technology, A temporary storage facility is installed in the main body 110 .

The hydrogen supply unit 125 may include a tank capable of storing hydrogen and, if necessary, a facility capable of supplying hydrogen by connecting it to land through a pipeline or connecting a pipe to a ship capable of transporting hydrogen.

In addition, a suction means 160 may be provided so that the leg 130 can easily penetrate the soft soil layer by grafting a suction method using a pressure difference to facilitate the work of breaking through the soil layer.

Specifically, the suction means 160 corresponds to the depth of the soil layer to be penetrated from the lower end of the leg 130, and surrounds the spud 131 to the outside and is formed on the upper side but the lower side is open. A cylindrical suction pipe 161, The suction pipe 161 is provided with a decompression part 162 for depressurizing the inside.

That is, the leg 130 is located between the suction pipe 161, and the pressure reducing unit 162 is located on the main body side as a pressure reducing means such as a vacuum pump or an ejector and communicates with the inside of the suction pipe 161 through the pipe. do.

Through this, the leg 130 is lowered to depressurize the suction pipe 161 together with the lowering of the leg 130 in a state where the spud 131 and the suction pipe 161 are seated in the soil layer, and the lower side, that is, the suction pipe 161 and The soil is sucked between the spuds 131 and helps the legs 130 penetrate the soil layer and move downward.

6 is a process diagram showing an assembly, transportation, and installation method according to an embodiment of the present invention, and FIG. 7 is a flow chart showing an assembly, transportation, and installation method according to an embodiment of the present invention, based on the configuration and structure described above. The construction method of the offshore wind power structure according to the present invention will be described.

In the first preparation step (S 110), the tower 102 and the wind turbine 101 are assembled in the upper center of the main body 110 on land, and the legs 130 are inserted and fixed to each leg support 111. Since this work uses a crane on land or an offshore crane docked at a pier, it is possible to reduce a large cost compared to the conventional construction method in which assembly is performed at sea.

In the next second step (S 120), the prepared main body 110 is floated on the sea and moved to the installation site. In a state in which the main body 110, in which the tower 102 and the wind turbine 101 are installed, is moved through an inclined surface in a sliding manner as a method of launching a ship, and floated on the sea, or the main body 110 prepared in a dock is located in a docking method It is possible to apply a method of filling the seawater to the same level as the sea level and floating it.

In this step (S 120), the leg 130 maintains a state of protruding downward from the main body 110 to a level that does not interfere with the launching work, and the floating main body is moved to the installation site through a tugboat, and if necessary, ballast Through a ballast operation of injecting or discharging seawater into the tank 113, the main body 110 can be leveled during launch and movement.

In the third jacking step (S 130), the jacking means 140 is coupled to each leg support 111 to lower the legs 130 and seat them on the bedrock layer. Initially, the provided legs 130 are lowered simultaneously to check whether each leg has reached the bedrock layer. If necessary, the main body 110 can be maintained horizontally through ballast work.

In the fourth leveling step (S 140), the provided legs 130 are individually raised and lowered to adjust the level of the body 110 in detail, and the body ( 110) is leveled to complete the jacking operation. At this time, all seawater in the ballast tank 113 may be emptied.

In the next fifth step (S 150), the construction work is completed by removing the jacking means 140 after fixing the leg 130 inserted into each leg support 111 according to the horizontal adjustment of the main body 110. At this time, measures are taken so that the leg 130 does not move any more through the fixing means 150 provided in accordance with the removal of the jacking means 140.

The rights of the present invention are defined by what is described in the claims, not limited to the embodiments described above, and that those skilled in the art can make various modifications and adaptations within the scope of rights described in the claims. It is self-evident.

101: turbine 102: tower
110: body 111: leg support
112: level detection unit 113: ballast tank
114: pump unit 121: artificial reef
122: connecting means 123: tension sensing unit
124: water electrolysis means 125: hydrogen supply unit
130: leg 131: spud
132: pinhole 140: jacking means
141: fixed part 142: moving part
143: actuator 144: pin
145: cylinder 146: rock detection unit
150: fixing means 160: suction means
161: suction pipe 162: pressure reducing unit

Claims (6)

In the offshore wind power generation structure for installing a wind turbine 101 and a tower 102 supporting the turbine 101 on the sea,
As a structure that can float on water, a plurality of leg support parts 111 penetrating in the vertical direction at intervals set toward the rim side are formed, and a main body 110 in which a tower 102 and a wind turbine 101 are installed in the upper center ;
It is a rod-shaped structure that is inserted into the leg support part 111 and can slide in the vertical direction. At the lower end, a cone-shaped spud 131 having a larger radius and then gradually smaller is formed. A plurality of legs 130 made to a height capable of supporting the main body located on the sea in a state of being seated on the rock layer, and having pinholes 132 formed in the vertical direction at set intervals;
A structure that is detachable from the leg support 111 and is temporarily installed to cover some or all of the outside of the leg 130 to lower or raise the leg 130, allowing the leg 130 to move in the vertical direction. A fixing part 141 that operates to fix or fix, and a moving part that is spaced apart from the upper or lower side of the fixing part 141 and moves up and down within a set range, but which is temporarily combined with and disassembled from the leg 130. 142 and an actuator 143 that moves the moving part 142 up and down. Jacking means 140 provided with a pin 144 that restricts vertical movement and a cylinder 145 that moves the pin to be inserted into the pin hole 132 or driven to extract the pin 144 inserted into the pin hole 132 ;
A fixing means 150 installed on the leg support part 111 to fix the leg 130 so that it does not move when the jacking means 140 is removed; Offshore wind power structure comprising a.
According to claim 1,
The main body 110,
A level sensor 112 for measuring horizontality, a ballast tank 113 configured in the form of a compartment of a compartment set inside, and seawater injected into the ballast tank 113 or seawater accommodated in the ballast tank 113 Offshore wind power generation structure further comprising a pump unit 114 for discharging.
According to claim 2,
The jacking means 140,
An arm that monitors a driving source required to drive the actuator 143 in a state in which the leg 130 moves downward and determines the position of the spud 131 by dividing it into a sedimentary clay layer, a sedimentary sand layer, weathered soil, and weathered rock. Offshore wind power generation structure further comprising a half-sensing unit 146.
According to claim 1,
The main body 110,
A plurality of artificial reefs 121 connected through the connecting means 122 and installed on the sea floor, a tension sensor 123 for measuring the tension applied to the connecting means 122, and the turbine 101 An offshore wind power generation structure characterized in that it further comprises a water electrolysis means (124) for generating hydrogen by inhaling and decomposing seawater through the power produced through, and a hydrogen supply unit (125) for temporarily storing and transporting the produced hydrogen. .
According to claim 1,
The leg 130,
A cylindrical suction pipe 161 wrapped around the spud 131 to the outside and formed on the upper side but having an open lower side, and a pressure reducing unit 162 for depressurizing the inside of the suction pipe 161 are provided, so that soil is sucked into the lower side. a suction means 160 that helps the legs 130 penetrate the soil layer and move downward; Offshore wind power generation structure further comprising a.
In the construction method of the offshore wind power structure according to claim 1,
A preparation step of assembling the tower 102 and the wind turbine 101 to the upper center of the main body 110 on land, and inserting and fixing the leg 130 to each leg support 111 (S 110);
Floating the prepared main body 110 on the sea and moving it to an installation site (S 120);
A jacking step of lowering the leg 130 by coupling the jacking means 140 to the leg support 111 and seating it on the rock layer (S 130);
A leveling step of individually raising and lowering the provided legs 130 and adjusting the level of the main body 110 (S 140);
Step of removing the jacking means 140 after fixing the legs 130 inserted into each leg support 111 according to the body leveling (S 150); Construction method of the offshore wind power structure, characterized in that consisting of.

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