KR101318111B1 - Substructure of hybrid offshore wind turbine with multi-pile for reducing wave forces, and constructing method for the same - Google Patents

Abstract

PURPOSE: A wave power reduction type multi-row offshore hybrid wind power plant support structure and a construction method thereof are provided to improve safety of the support structure by reducing wave power which acts on the support structure. CONSTITUTION: A wave power reduction type multi-row offshore hybrid wind power plant support structure (100) includes a concrete base (110), a concrete cone (120), a concrete-filled charge multi-row pile (130), a member connection unit (150), and a foundation pile (140). The concrete cone has a cone or a pillar shape, and forms a gravity concrete block by being combined with the concrete base. The concrete-filled multi-row pile is connected to the upper part of the concrete cone to resist a compressive force which is generated by a superstructure and a part of an overturning and bending moment. [Reference numerals] (210) Bedrock; (220) Poor ground; (230) Poor ground improvement and compensation unit

Description

Wave-reduced multi-row pile hybrid offshore wind support structure and construction method {SUBSTRUCTURE OF HYBRID OFFSHORE WIND TURBINE WITH MULTI-PILE FOR REDUCING WAVE FORCES, AND CONSTRUCTING METHOD FOR THE SAME}

The present invention relates to an offshore wind support structure, and more particularly, in a hybrid support structure (Hybrid Substructure) for installing an upper structure consisting of a tower, a nacelle and a blade thereon for the offshore wind power generation, The present invention relates to a hybrid offshore wind support structure capable of reducing wave forces applied to the support structure by using a -Pile and a construction method thereof.

In general, a wind turbine generating power using wind is installed to install a blade (or propeller) on the rotating shaft of the generator, it is configured to generate power by using the rotational force generated as the blade rotates by the wind. The wind turbine is a device that converts the energy of the wind into electrical energy, typically composed of a blade, a transmission and a generator, and rotates the blade of the wind turbine, and produces electricity by the rotational force of the blade generated at this time.

Here, the blade is rotated by the wind to convert the wind energy into mechanical energy, the transmission is the rotational force generated in the blade is transmitted to the transmission gear through the central rotation axis, and the generator to increase the number of revolutions required by the generator It is a device for rotating, a generator is a device for converting the mechanical energy generated in the blade into electrical energy.

Such a wind power generation system is easy to operate and manage because of its simple structure, installation, and the like, and unmanned and automated operation is being introduced in recent years. 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 safely construct wind power structures at sea, a safe installation method for the blade and tower structures to be installed at a high position is required.

In other words, such a wind turbine facility is a system configured to convert kinetic energy from wind into electrical energy, and may be classified into onshore and offshore according to installed environmental conditions. In addition, there is a method of installing such piles or piles, such as drive type, hydraulic pressure type, suction method, etc. In order to install large diameter piles or piles, it is necessary to install vertically well.

It is the role of the tower to place wind power generation nacelle at a given height in order to achieve the desired and desired power in the wind turbine installation. These wind turbines have a horizontal type and a vertical type. Recently, development and installation of horizontal wind turbines have been actively performed in Korea and overseas. The type of the wind turbine tower is a monopile type, jacket type, branch support type, etc. Recently, large wind turbines are mainly used monofilament type tower, in particular, steel hollow monopile tower. At this time, the joint is formed for transferring the load on the steel hollow tower to the ground foundation. These joints may be divided into anchor bolts and anchor ring types.

On the other hand, Figure 1 is a diagram schematically illustrating a wind power support structure.

The offshore wind turbine structure is largely divided into a turbine and a substructure. In this case, the turbine basically applies the same technology as the onshore wind turbine 10. The lifespan of these offshore wind turbines is about 20 years, and wind turbines of 3 to 5 MW or more are used. Each component of such an offshore wind farm structure can be designed and coated to prevent corrosion damage due to salt.

Here, the support structure (Substructure) is typically, concrete caisson type, mono-pile type, jacket type, jacket type, tripod type and floating type (Floating type) Can be divided into five types.

Specifically, the concrete caisson type is a gravity type, which is easy to manufacture and install, and is used in an early offshore wind farm, and has been applied to Vindeby, Middelgrunden offshore wind farms, and the like. This concrete caisson type can be used at relatively shallow depths of 6 to 10 meters and maintains its position due to friction between its own weight and the sea floor. At this time, the foundation diameter of the concrete caisson type is 12 ~ 15m.

In addition, as shown in FIG. 1, the monopile type 20 is the most popular offshore wind farm based method, which can be installed at a depth of 25 to 30 m. It is applied to Horns Rev, North Hoyle offshore wind farm, etc., and is used in large-scale complexes by driving or drilling large diameter piles on the sea floor. Good economy. At this time, the basic diameter of the monopile type is 3 ~ 3.5m.

The jacket type is currently showing interest in demonstration countries in offshore wind farms, and can be installed at depths of 20 to 80 meters. This type of jacket is supported by a jacketed structure and fixed to the seabed with a pile or pile. Such a jacket type is a structure of a deep-sea marine, has a lot of achievements and high reliability, and like the monofilament type 20 described above, it is advantageous in terms of economic efficiency when used for constructing a large unit complex.

In addition, as shown in Figure 1, the tripod type 30 is an extension of the above-described monopile type 20 to the bottom, it can be installed at a depth of 20 ~ 80m. Such a tripod type 30 is characterized by using a small diameter file without the need to clean up the floor, but the manufacturing cost is increased because an anchor file is required.

In addition, as shown in Figure 1, the floating type 40 can be said to be an essential task of the future deep sea wind power generation, many wind companies are researching to be installed at a depth of 40 ~ 900m.

On the other hand, the recent offshore wind power generation has attracted much attention due to the vast amount of wind energy and the possibility of using unlimited energy sources, and the offshore wind turbine market is also growing. The output power of is increasing.

2 is a view for explaining the external force acting on the offshore wind power support structure.

As shown in Figure 2, the offshore wind power support structure is installed on the sea unlike the existing onshore wind power support structure is greatly affected by external forces due to waves, tides and wind.

In addition, as the output power of offshore wind power increases, the size of the tower and the rotor nacelle of the generator is increasing, and the size of the supporting structure for supporting it is also increasing. That is, as the size of the offshore wind support structure of the existing type increases, the wave force acting on the existing support structure (gravity type and monopile) increases, thereby reducing the safety of the support structure.

Japanese Patent Application Laid-Open No. 2011-137365 (published: July 14, 2011), title of the invention: "Method of constructing a basic structure in a wind power plant" Japanese Patent Application Laid-Open No. 2007-120470 (published: May 17, 2007), title of the invention: "The basic structure of the offshore wind power generator and the construction method of the basic structure of the offshore wind power generator" Japanese Laid-Open Patent Publication No. 2006-322400 (published: November 30, 2006), title of the invention: "Gravity Foundation of Offshore Wind Power Generator" Japanese Patent Application Laid-Open No. 2006-46013 (published: February 16, 2006), title of the invention: "Mono pile foundation structure of wind power plant" Japanese Laid-Open Patent Publication No. 2005-180239 (published: July 7, 2005), title of the invention: "Basic foundation of offshore wind power generator" Republic of Korea Patent No. 10-1171201 (filed December 26, 2011), the title of the invention: "Offshore wind power structure using steel pipe pile foundation and prefabricated structure and its construction method"

The technical problem to be solved by the present invention to solve the above problems, by combining concrete filled multi-Piles (CFMP) with a gravity-type offshore wind power support structure, to reduce the wave force acting on the support structure It is to provide a wave reducing multi-row pile hybrid offshore wind power support structure and its construction method that can increase the safety of the structure.

Another technical object of the present invention is to produce a concrete base, a concrete cone and CFMP, respectively, after the floating lifting and submerged to the installation sea area after installation of CFMP, which can be installed and installed very simply, the wave power reduction It is to provide a multi-row pile hybrid offshore wind support structure and its construction method.

Another technical problem to be achieved by the present invention, since the form is completed by assembling the concrete base, concrete cone, and CFMP, which can flexibly respond to the increase in size of the lower support structure according to the increase in the capacity of the upper wind power, wave reduction type It is to provide a multi-row pile hybrid offshore wind support structure and its construction method.

As a means for achieving the above technical problem, the wave-powered multi-pile hybrid offshore wind support structure according to the present invention, the offshore wind power support structure for installing the upper structure consisting of towers, nacelle and blades for offshore wind power generation In order to ensure the stability of the offshore wind support structure, concrete base (Concrete Base) that serves as a base for installing and supporting the concrete cone; Concrete cones in the form of horns or columns, combined with the concrete base to form a gravity-type concrete block (Concrete Cone); Concrete Filled Multi-Pile (CFMP) connected to the top of the concrete cone to resist compressive forces by the superstructure and to partially resist the overturning moment and the bending moment; A member connecting portion connecting the concrete cone and the CFMP; And including a pile (Pile) for fixing the concrete base on the ground, characterized in that the gravity-type concrete block and the CFMP is coupled to reduce the wave force acting on the hybrid offshore wind support structure.

Here, the CFMP is a prestressed concrete filled steel pipe column, the CFMP is increased in the number of piles (Pile) corresponding to the size of the external force to be supported, the CFMP and the concrete the bending moment which is an external force acting on the offshore wind power support structure The cone is divided, and the concrete cone penetration depth of the CFMP intermediate pile can be adjusted according to the bending moment size.

Here, the CFMP is installed above the concrete cone with a length (d) of not less than one quarter and not more than three quarters of the total depth, and resists external forces by using the interaction between the CFMP and the incident wave to reduce wave force. It is characterized by.

Here, the concrete base is integrated with the concrete cone after securing the necessary weight to form a gravity-type concrete block, it can be configured in a circular, square, hexagonal or octagonal form according to the installation environment.

Here, the concrete base is characterized in that after the introduction of the prestress (Prestress) in the upper portion of the soft ground, and integrated with the soft ground using the foundation pile.

Here, the concrete cone is provided in the hollow form of the hollow inside, if high safety is required according to the installation environment by filling the crushed stone inside the installation site to increase the weight, according to the bending moment size of the CFMP intermediate pile It is characterized in that the concrete cone penetration depth can be adjusted.

In this case, the concrete base, the concrete cone and the CFMP may be installed separately or integrally installed.

As another means for achieving the above technical problem, the construction method of the wave-powered multi-pile hybrid offshore wind support structure according to the present invention, the offshore for installing the superstructure consisting of tower, nacelle and blade for offshore wind power generation A method of constructing a wind support structure, the method comprising: a) improving and reinforcing soft ground on a rock at a point on which an offshore wind support structure is to be installed; b) installing a plurality of foundation piles on the soft ground improvement and reinforcement; c) mounting a gravity-type concrete block coupled to a concrete base and concrete cone on the foundation pile; And d) mounting a plurality of concrete-filled multi-row piles (CFMP) to the fixing unit on the concrete block, and performing grouting, wherein the gravity-type concrete block of step c) and the CFMP of step d) are combined It is characterized by reducing the wave force acting on the hybrid offshore wind support structure.

Here, the step c) is characterized in that the concrete pile and the concrete block is mounted on the foundation pile position coupled to the concrete, and grouting.

Here, the step c) is characterized in that the concrete block combined with the concrete base and the concrete cone is manufactured on land, and after lifting the concrete block floating using a marine crane, it is characterized in that it is submerged in the installation sea area.

Here, the step d) is characterized in that after installing the member connecting portion connecting the concrete block and the CFMP in advance, through a plurality of CFMP and grouting to complete the hybrid offshore wind support structure.

Here, the CFMP is a prestressed concrete filled steel pipe column, the CFMP is increased in the number of piles (Pile) corresponding to the size of the external force to be supported, the CFMP and the concrete the bending moment which is an external force acting on the offshore wind power support structure The cone is divided, and the concrete cone penetration depth of the CFMP intermediate pile can be adjusted according to the bending moment size.

Here, the CFMP is installed above the concrete cone with a length (d) of not less than one quarter and not more than three quarters of the total depth, and resists external forces by using the interaction between the CFMP and the incident wave to reduce wave force. It is characterized by.

Here, the concrete base and the concrete cone of step c), CFMP of the step d) is characterized in that each divided or installed in one piece.

According to the present invention, by combining the pile of piles filled with concrete to the hybrid offshore wind power support structure can reduce the wave force acting on the support structure to increase the safety of the structure. That is, as the size of the hybrid support structure increases, the wave force acting on the support structure increases, but the safety of the support structure can be increased by the pile of piles filled with concrete.

According to the present invention, after manufacturing the concrete base, concrete cone and CFMP on the land, and then floating and submerged to the installation sea area, and then install the CFMP as a form of installation and construction method is very simple, accordingly construction cost You can save a lot.

According to the present invention, since the concrete base, the concrete cone and the CFMP is completed by assembling the form, it is possible to flexibly respond to the increase in the size of the lower support structure according to the increase in the upper wind power capacity.

According to the present invention, it is possible to reduce the material cost because the configuration that can effectively resist the external force, and because the concrete cone and CFMP each share the external force can reduce the overall size for the same external force Can reduce the cost.

According to the present invention, CFMP can significantly reduce the range of the seabed ground floor clearance by reducing the wave force acting on the support structure itself to reduce the size of the lower support structure, thereby reducing the construction cost.

According to the present invention, since the CFMP is relatively small compared to the case of the monopile format, since there is no limitation of the equipment generated when the large-diameter monopile is installed, the equipment lease cost can be reduced.

According to the present invention, the installation and construction method is very simple to effectively reduce the construction cost, it is possible to efficiently design and construct a hybrid offshore wind power support structure because the safety can be secured in various ways.

1 is a diagram schematically illustrating a wind power support structure.
2 is a view for explaining the external force acting on the offshore wind power support structure.
3 is a view showing a wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.
4 is a view for explaining a multi-row pile in the wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.
5 is a view for explaining a concrete base in the wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention in detail.
6 is a view for explaining in detail the CFMP in the wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.
7 is a view for explaining the concrete cone in the wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.
FIG. 8 is a view illustrating various forms of concrete blocks in a wave reduction type multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a format of a wave force reducing multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention.
10 is a view showing a wave comparison result of the wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.
11A to 11E are views illustrating a construction method of a wave force reducing multi-pile hybrid offshore wind power support structure according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. 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 the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

3 is a view showing a wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.

Referring to FIG. 3, the hybrid offshore wind turbine structure according to an embodiment of the present invention includes a hybrid offshore wind turbine support structure 100, a ground 200, and an upper structure 300, according to an embodiment of the present disclosure. Hybrid offshore wind power support structure 100 has a form that combines gravity and multi-row piles.

Specifically, the wave-powered multi-row pile hybrid offshore wind support structure 100 according to an embodiment of the present invention, the offshore wind power support structure for installing the upper structure consisting of towers, nacelle and blades for offshore wind power generation, concrete Concrete Base 110, Concrete Cone 120, Concrete Filled Multi-Pile CFMP 130, Foundation Pile 140, and Member Connections 150. . At this time, a tower, a nacelle and a blade are installed on the upper portion of the concrete-filled pile file 130, and the rock bed 210, the soft ground 220, and the soft ground improvement and reinforcement part are disposed below the concrete base 110. 230) is constructed.

The concrete base 110 secures the stability of the support structure 100 by weight in the same manner as the existing gravity support structure, and serves as a foundation for installing and supporting the concrete cone 120.

Concrete cone 120 ensures the safety of the support structure by weight in the same manner as the existing gravity-type support structure, combined with the CFMP (130) serves to share the bending moment with the CFMP (130), the concrete Cones 120 are horn-shaped or columnar, combined with the concrete base 110 to form a gravity-type concrete block.

Concrete-filled thermal pile (CFMP) 130 resists compressive forces by superstructure 300 consisting of tower 310, nacelle (not shown), blades (not shown), etc., and is part of the conduction moment and bending moment. It is resistant and connected to the upper portion of the concrete cone 120 to serve to maintain the verticality of the overall offshore wind power generation structure. For example, the CFMP 130 is a pre-stressed concrete filled steel pipe column, and serves to reduce the wave force acting on the offshore wind hybrid support structure 100 by the interaction between the incident wave and the CFMP 130 near the sea surface. Here, the CFMP 130 may be a prestressed concrete filled steel pipe pillar. In addition, the CFMP 130 increases the number of piles corresponding to the size of the external force to be supported, and the CFMP 130 and the concrete cone are the bending moment which is the external force acting on the offshore wind power support structure 100. 120 is shared, and the depth of concrete cone penetration of the CFMP intermediate pile can be adjusted according to the bending moment size. That is, as shown, the intermediate pile of the CFMP 130 is formed to extend to the concrete cone 120, it is possible to adjust the concrete cone penetration depth. Accordingly, as will be described later, the gravity-type concrete block and the CFMP 130 is coupled to reduce the wave force acting on the hybrid offshore wind support structure (100).

Here, the upper structure 300 may include a transition piece 310, a tower 320, a nacelle, and a blade. In addition, a nacelle (not shown) installed above the tower 320 includes a pitch system, a hub, a main shaft, a gear box, a high speed shaft, and a generator. And a yaw system.

Foundation pile 140 is fixed to the concrete base 110 on the ground (200) consisting of a rock 210, soft ground 220 and soft ground improvement and reinforcement 230.

The member connection part 150 connects the concrete cone 120 and the CFMP 130.

On the other hand, Figure 4 is a view for explaining a multi-row pile in the wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.

The wave reduction type multi-row pile hybrid offshore wind support structure 100 according to the embodiment of the present invention, as shown in Figure 4, the multi-pile on the gravity-type concrete block combined with the concrete base and the concrete cone By installing the CFMP 130 to reduce the cross-sectional force acting on the offshore wind power support structure 100 can reduce the wave force. Accordingly, the wave reduction-type multi-pile hybrid offshore wind support structure 100 according to the embodiment of the present invention becomes a structure that is more favorable to dynamic characteristics, vibration and fatigue.

In addition, the wave-reduced multi-row pile hybrid offshore wind support structure 100 according to an embodiment of the present invention can be installed by using a small offshore equipment by splitting the multi-row pile CFMP 130 and gravity-type concrete blocks, Accordingly, it is possible to reduce the rental cost and manufacturing cost.

On the other hand, Figure 5 is a view for explaining the concrete base in the wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention in detail.

 Concrete base 110 in the wave-reduced multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention, can be utilized in the same way as the existing gravity support structure, as shown in Figure 5a), The foundation pile 140 can be used to integrate with the ground for improvement.

In addition, where ground subsidence is a concern, such as soft ground, prestress is introduced outside the concrete base 110, as shown in b) of FIG. 5, and then integrated with the ground 200 first. By continually monitoring the tension of the tension material, it is possible to increase the tension on the opposite side of the settlement when the signs of ground subsidence are captured, thus suppressing the occurrence of ground subsidence or forcing the opposite side to maintain equilibrium.

6 is a view for explaining in detail the CFMP in the wave force reduction multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.

In the wave-reduced multi-row pile hybrid offshore wind support structure according to the embodiment of the present invention, as shown in FIG. 6, the CFMP 130 is basically a length (d) of not less than one quarter and not more than three quarters of the total depth. By using the interaction between the incident blue and CFMP (130) installed on the upper concrete cone 120 to improve the resistance to external forces, or to reduce the size of the same external force than conventional monopile or gravity support structure You can.

On the other hand, Figure 7 is a view for explaining the concrete cone in the wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention.

Concrete cone 120 in the wave reduction-type multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention, as shown in a) of Figure 7, the hollow form inside. In this case, the concrete cone 120 can be lifted to a floating place without carrying the carrying on the barge. In addition, when high safety is required according to the installation environment, after installing the concrete cone 120, as shown in b) of Figure 7, by filling the crushed stone and the like to increase the weight resistance to external forces Can improve.

On the other hand, with the increase in output power of offshore wind power, the size of towers, nacelle and blades is increasing, and the size of the substructure (gravity or monopile) for supporting it is also gradually increasing. Accordingly, as the size of the existing type increases, the manufacturing cost, transportation cost, and installation cost may increase exponentially, and installation may be limited because the capacity of installation equipment such as a marine crane must also increase.

However, the wave reduction type multi-row pile hybrid offshore wind power support structure 100 according to an embodiment of the present invention, the concrete base 110, the concrete cone 120, concrete filled multi-row pile (CFMP: 130) is a structure that is combined Each can be manufactured independently, and since the external force is shared between the concrete cone 120 and the concrete-filled multi-pile pile (CFMP: 130), the size of the lower support structure due to the increase in the capacity of the upper wind turbine can be flexibly responded to.

FIG. 8 is a view illustrating various forms of concrete blocks in a wave reduction type multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention.

Referring to FIG. 8, in the wave reduction-type multi-pile hybrid offshore wind support structure according to the embodiment of the present invention, the concrete base 110 and the concrete cone 120 may be prepared in advance.

For example, when the capacity of the upper wind turbine is increased, the size of the concrete base 110 should also be large, as shown in FIG. 8 a) to c), after the split fabrication in the form of concrete blocks, assembly at sea or undersea. By construction, the size can be designed freely. At this time, the assembly of the concrete block according to the embodiment of the present invention may utilize the same method as the method used in the existing concrete block assembly method.

In addition, when manufacturing the concrete block, as shown in b) or 8 c) of FIG. 8, if only the outer frame to maintain its shape and empty the inside, floating in the sea transport to lift the carrier ship Capacity constraints can be solved. In addition, it is possible to assemble in a floating state at the installation position. Thereafter, after the assembly is completed, the completed concrete base 110 is settled on the sea bottom, and then a method of completing the gravity-type concrete base by filling concrete at sea is also possible.

In addition, since the concrete base 110 secures the necessary weight and is integrated with the concrete cone 120, when a substantial increase is required, the concrete base 110 may be configured as shown in FIG. 8C. At this time, in the embodiment of the present invention, although the shape of the concrete base 110 is shown as a hexagon, it will be apparent to those skilled in the art that it may vary depending on the installation environment, such as circular, square, octagonal.

In addition, the concrete filled thermal pile (CFMP) 130 may increase the number of piles according to the size of the external force to be supported. That is, the size of the concrete cone 120 should also increase as the capacity of the upper wind power plant increases, but the wave-powered multi-pile hybrid offshore wind power support structure 100 according to the embodiment of the present invention has an external force on the concrete cone 120. ) And concrete filling multi-row piles (CFMP: 130), the increase is small compared to the existing type.

In particular, the concrete filled thermal pile (CFMP) 130 is configured to allow interaction between the incident wave and the thermal pile at the seawater surface. That is, since the wave force applied to the substructure by the blue wave due to the interaction effect is reduced, the external force that the wave reduction type multi-pile hybrid offshore wind power support structure 100 according to the embodiment of the present invention must support is reduced, As a result, it is possible to reduce the size of the offshore wind power support structure 100, thereby reducing the construction cost.

On the other hand, Figure 9 is a view illustrating the type of wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention, Figure 10 is a wave-powered multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention. It is a figure which shows the comparison result of wave force.

When the structure supporting the 5MW offshore wind turbine is configured in the form of a mono pile, as shown in a) of FIG. 9, the outer diameter of the mono pile may be 4.8 m and a thickness of 0.07 m. The permissible compressive / bending stress that this monopile can support is 140 MPa, with a permissible congratulation of 145.6 MN.

As shown in b) and 9) of FIG. 9, the wave force reducing multi-pile hybrid offshore wind power support structure 100 according to the embodiment of the present invention is CFMP ( 130). The allowable flexural compressive stress of concrete having a compressive strength of 35 MPa is 14 MPa. In this case, if the steel pipe uses the same steel grade and thickness as that of the monopile, the specification of the CFMP 130 may be simply obtained as in Equation 1 below.

[Equation 1]

Working load (mono pile) = steel (CFMP) allowable stress x steel net area + concrete allowable stress x concrete net area

Here, comparing the price of the monopile shown in a) of FIG. 9 with the CFMP 130 shown in b) and c) of FIG. 9, for example, the monopile is about 3.9 billion won, and the CFMP 130 Since the 2.5 million won, CFMP 130 used in the wave-powered multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention is economical because it can reduce the cost about 35%.

Specifically, in order to examine the wave reduction effect according to the CFMP 130 near the sea surface, by placing the CFMP 130 on the same circumference as the monopile diameter shown in Figure 9a) as shown in b) of Figure 9 Similarly, as shown in five CFMP (130) and 9 c), the wave force acting on each structure for nine CFMP (130) was compared by numerical analysis. That is, as shown in b) and c) of FIG. 9, the CFMP 130 is arranged, where the depth of calculation is 20m, the monopile diameter is 8.0m, the outer small diameter of the CFMP 130 is 0.7m The inner diameter was set to 1.25 m.

As a result of the numerical analysis, as shown in FIG. 10, it can be seen that the CFMP 130 has a larger wave reducing effect than the monopile in a given wave period range. In other words, it can be seen that as the number of CFMP 130 increases, the cross-sectional force corresponding to the wave force decreases.

Meanwhile, FIGS. 11A to 11E are views illustrating a construction method of a wave force reducing multi-pile hybrid offshore wind power support structure according to an embodiment of the present invention.

The construction method of the wave-reduced multi-row pile hybrid offshore wind support structure according to an embodiment of the present invention, first, as shown in Figure 11a, the soft ground on the rock 210 of the point to install the offshore wind support structure 100 Improving and reinforcing 220 to form a soft ground improvement and reinforcement 230.

Next, as shown in FIG. 11B, a plurality of foundation piles 140 are installed on the soft ground improvement and reinforcement 230.

Next, as shown in FIG. 11C, a gravity concrete block is mounted on the foundation pile 140. That is, the concrete block 110 is mounted on the concrete pile 110 and the concrete cone 120 is coupled to the position of the foundation pile 140, and grouting is performed.

Specifically, the concrete block combined with the concrete base 110 and the concrete cone 120 is manufactured on land, and after lifting and lifting the concrete block using a marine crane, and soaked in the installation sea area. Then, as shown in Figure 11d, to install the CFMP 130 on the concrete block submerged in the installation sea area.

That is, the concrete base 110 and the concrete cone 120 is mounted on the fixing unit on the concrete block coupled to each of the plurality of CFMP (130) is mounted and grouting. At this time, the member connecting portion 150 for connecting the concrete block and the CFMP 130 is installed in advance, after mounting a plurality of CFMP (130) and grouting to reduce the wave strength multi-row pile according to an embodiment of the present invention Complete the hybrid offshore wind support structure. In the construction method of the wave-reduced multi-row pile hybrid offshore wind power support structure according to an embodiment of the present invention, the concrete base 110, the concrete cone 120 and the CFMP 130 is divided or installed or integrally installed Done.

Subsequently, as shown in FIG. 11E, the transition piece 310 on the wave reduction type multi-pile hybrid offshore wind support structure 100 according to the embodiment of the present invention, ie on the CFMP 130, The tower 310, nacelle and blades are sequentially installed to complete the offshore wind power structure.

The construction method of the wave-reduced multi-row pile hybrid offshore wind power support structure 100 according to an embodiment of the present invention, as shown in Figure 10a to 10e, the concrete base 110, the concrete cone 120 and After the CFMP 130 is produced on land, respectively, floating and flooded to the installation sea area, and then install the CFMP 130 as a type of installation and construction is very simple, thereby greatly reducing the construction cost have.

Wave force reduction multi-pile hybrid offshore wind power support structure 100 according to an embodiment of the present invention, the concrete base 110, the concrete cone 120 and the CFMP 130 because it is completed by assembling the form is completed It is possible to flexibly respond to the increase in size of the lower support structure 100 as the wind power capacity increases.

In addition, the wave-powered multi-row pile hybrid offshore wind power support structure 100 according to an embodiment of the present invention can reduce the material cost because it can be configured to effectively resist the external force, and the external force is a concrete cone ( 120) and the CFMP 130, respectively, since the total size can be reduced for the same external force can be reduced manufacturing costs.

In addition, in the wave force reduction multi-pile hybrid offshore wind power support structure 100 according to an embodiment of the present invention, the CFMP 130 reduces the wave force acting on the support structure 100 itself by reducing the size of the lower support structure The extent of subfloor ground clearance can be significantly reduced, thereby reducing construction costs.

In addition, in the wave-reduced multi-row pile hybrid offshore wind support structure 100 according to an embodiment of the present invention, CFMP 130 is relatively small compared to the case of the monopile type, so the limitation of equipment generated during large diameter monopile installation This reduces the cost of renting equipment.

In addition, the wave-powered multi-row pile hybrid offshore wind support structure 100 according to an embodiment of the present invention because the installation and construction method is very simple can effectively reduce the construction cost, and can ensure safety in a variety of ways Efficiently design and construct

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features 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 shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: wave reduction multi-row pile hybrid offshore wind support structure
200: ground
300: superstructure
110: concrete base
120: Concrete Cone
130: Concrete Filled Multi-Pile (CFMP)
140: Pile
150: member connection portion
210: bedrock
220: soft ground
230: soft ground improvement and reinforcement
310: transition piece (TP)
320: Tower

Claims (14)

In the offshore wind support structure for installing the superstructure consisting of tower, nacelle and blade for offshore wind power generation,
Concrete base to secure the stability of the offshore wind support structure, and serves as a foundation for installing and supporting the concrete cone (Concrete Base);
Concrete cones in the form of horns or columns, combined with the concrete base to form a gravity-type concrete block (Concrete Cone);
Concrete Filled Multi-Pile (CFMP) connected to the top of the concrete cone to resist compressive forces by the superstructure and to partially resist the overturning moment and the bending moment;
A member connecting portion connecting the concrete cone and the CFMP; And
Foundation pile for fixing the concrete base on the ground
Including,
Wave gravity reduction multi-row pile hybrid offshore wind support structure, characterized in that the gravity-type concrete block and the CFMP is coupled to reduce the wave force acting on the hybrid offshore wind support structure. The method of claim 1,
The CFMP is a prestressed concrete filled steel pipe column, the CFMP is increased in the number of piles (Pile) corresponding to the size of the external force to support, the CFMP and the concrete cone is a bending moment that is an external force acting on the offshore wind support structure A wave reduction type multi-row pile hybrid offshore wind support structure, which is divided and can control the depth of concrete cone penetration of the CFMP intermediate pile according to the bending moment size. The method of claim 1,
The CFMP is installed on top of the concrete cone with a length d of not less than one quarter and not more than three quarters of the total depth, and using the interaction between the CFMP and the incident wave to reduce the wave force by resisting external force. A wave reducing multi-row pile hybrid offshore wind support structure. The method of claim 1,
The concrete base is integrated with the concrete cone after securing the necessary weight to form a gravity-type concrete block, wave-power reduction multi-row pile hybrid offshore wind power, characterized in that consisting of circular, square, hexagonal or octagonal form depending on the installation environment Support structure. The method of claim 1,
The concrete base is a wave reduction type multi-row pile hybrid offshore wind support structure, characterized in that after the introduction of the prestress (Prestress) in the upper portion of the soft ground, and integrated with the soft ground using the foundation pile. The method of claim 1,
The concrete cone is provided in the hollow form of the hollow inside, if high safety is required according to the installation environment by filling the crushed stone in the interior of the installation site to increase the weight, according to the bending moment size concrete cone of CFMP intermediate pile A wave reduction type multi-row pile hybrid offshore wind support structure, characterized in that the penetration depth can be adjusted. The method of claim 1,
The concrete base, the concrete cone and the CFMP is a wave-powered multi-row pile hybrid offshore wind power support structure, characterized in that installed separately or integrally installed. In the construction method of offshore wind support structure for installing the upper structure consisting of tower, nacelle and blade for offshore wind power generation,
a) improving and reinforcing the soft ground on the rock at the point where the offshore wind support structure is to be installed to form the soft ground improvement and reinforcement;
b) installing a plurality of foundation piles on the soft ground improvement and reinforcement;
c) mounting a gravity-type concrete block coupled to a concrete base and concrete cone on the foundation pile; And
d) mounting a plurality of concrete-filled multi-row piles (CFMP) to the fixing unit on the concrete block, respectively, and grouting
Including,
The method of constructing a wave reduction-type multi-pile hybrid offshore wind support structure, characterized in that the gravity concrete block of step c) and CFMP of step d) is combined to reduce the wave force acting on the hybrid offshore wind support structure. 9. The method of claim 8,
Step c) is a method of construction of a wave-powered multi-row pile hybrid offshore wind power support structure, characterized in that the concrete pile and the concrete block coupled to the concrete pile at the foundation pile location, and grouting. 9. The method of claim 8,
In step c), a concrete block combined with the concrete base and the concrete cone is manufactured on land, and after lifting and lifting the concrete block using a marine crane, the wave reduction type multi-row pile, characterized in that the submerged in the installation sea area. Construction method of hybrid offshore wind support structure. 9. The method of claim 8,
In step d), after installing the member connecting portion connecting the concrete block and the CFMP in advance, the wave reduction type multi-row pile, characterized in that the hybrid offshore wind power support structure is completed by performing a grout and a plurality of CFMP Construction method of hybrid offshore wind support structure. 9. The method of claim 8,
The CFMP is a prestressed concrete filled steel pipe column, the CFMP is increased in the number of piles (Pile) corresponding to the size of the external force to support, the CFMP and the concrete cone is a bending moment that is an external force acting on the offshore wind support structure A method of constructing a wave reducing type multi-row pile hybrid offshore wind support structure, which is divided and can control the depth of concrete cone penetration of the CFMP intermediate pile according to the bending moment size. 9. The method of claim 8,
The CFMP is installed on top of the concrete cone with a length d of not less than one quarter and not more than three quarters of the total depth, and using the interaction between the CFMP and the incident wave to reduce the wave force by resisting external force. A method of constructing a wave reducing multi-row pile hybrid offshore wind support structure. 9. The method of claim 8,
The concrete base and the concrete cone of step c), CFMP of step d) is a method of constructing a wave-powered multi-row pile hybrid offshore wind power support structure, characterized in that installed separately or integrally installed.

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