KR20160028755A - Concrete base of offshore wind substructure and the construction method therefor - Google Patents

Abstract

The present invention relates to an offshore wind power support structure using a concrete base and a constructing method thereof which use a concrete base, which allows an offshore wind power support structure supporting a wind power generation facility to be installed on a sea floor, as a connection portion of a multi-row pile and a base pile, minimize the weight of the concrete base, and effectively resist an applied load. The offshore wind power support structure using a concrete base comprises: a concrete base which is a hollow buoyant structure and comprises a body unit having a hollow shaft penetrating an upper and a lower surface thereof; a base pile inserted into the hollow shaft to position the upper end thereof in the hollow shaft; and a transition piece (TP) unit comprising a multi-row pile whose lower end is inserted into the hollow shaft and integrated with the upper end of the base pile in the hollow shaft.

Description

Technical Field [0001] The present invention relates to an offshore wind force supporting structure using a concrete base,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offshore wind force supporting structure using a concrete base and a construction method thereof. More specifically, a concrete base capable of installing an offshore wind force supporting structure supporting a wind power generation facility on a seabed ground can be used as a connection portion between a multi-row file and a foundation file, To a wind power support structure and a construction method thereof.

Generally, a wind turbine generating power using wind is constructed such that a blade (propeller) is installed on a rotary shaft of a generator, and power generation can be performed 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, and is usually composed of a blade, a transmission, and a generator.

In the past, the installation of wind turbines was mainly performed on land, but due to problems such as wind resources, aesthetics, and location constraints, it is in recent trends to construct wind turbines (offshore wind generators) on a large scale.

The offshore wind power generator is composed of a monofilament 1 and a transition piece integrally formed on the top of the monofilament 1 on the foundation 2, which is reinforced by the stalactite 3, And a wind turbine including a tower, a nacelle, and a blade is installed on the transition piece.

In this case, the foundation may be divided into a concrete concrete caisson type, a mono-pile type, a jacket type, and a floating type.

Thus, the mono-pile type can be installed at a depth of 25 to 30 m. This is economically advantageous when used in a large-scale complex by fixing large-diameter piles on the sea floor by driving or drilling. At this time, the base diameter of the monofile type is about 3 to 3.5 m.

Recently, offshore wind turbines have been moving to large scale complexes and large water depth areas for the economic development along with the development of large capacity turbines, and since the foundation (foundation, supporting structure) using steel has become difficult to secure economical efficiency, The development of basic parts using economical concrete is proceeding.

For example, as shown in FIG. 1B, development of a large-sized concrete base applicable to a depth of 30 to 100 m in consideration of sea transportation has been developed and applied in Europe.

However, since the gravity type foundation using concrete is large in size and heavy in weight, transportation and installation costs may increase, so it is necessary to reduce the weight and secure the workability.

1C shows a gravity basal part 2 (caisson) using another conventional concrete. That is, it can be seen that the base portion 2 is formed by the upper base portion 2a and the lower base portion 2b, and that the sofa block 4 is stacked on the upper end of the lower base portion 2b. .

At this time, in order to transmit the load transmitted from the column portion 6 formed at the upper end of the upper base portion 2a to the gravity type base portion 2 using concrete, As shown in Fig.

The column support pipe 7 is made of a cylindrical pipe so that the weight of the gravity type base part 2 using the concrete can be reduced and the cylindrical pipe is filled with concrete or sand after being installed on the sea floor G. Able to know. That is, in the prior art, a means for reducing the weight of the gravity-type foundation using concrete is partially disclosed.

Accordingly, in the present invention, a large-scale axial load and a lateral load acting on a concrete base due to the characteristics of an offshore wind force supporting structure are directly (directly or indirectly) applied to an offshore wind force supporting structure (hybrid supporting structure) To reduce the weight of the concrete base, thereby reducing the cost of offshore equipment required for offshore wind support structures and installation. An offshore wind force supporting structure and a method of construction thereof.

The present invention also provides an offshore wind force supporting structure (hybrid supporting structure) in which an upper multi-row file for lowering the power is combined with a lower concrete base, wherein the concrete base has a position control And to provide a method for constructing an offshore wind power supporting structure using a concrete base which can reduce the time and effort required for securing a position for foundation file hunting and the like.

In order to achieve the above object,

First, a plurality of hollow shafts (steel pipe columns) for the base file and the multi-row file insertion port are installed in the concrete base, and both the foundation file and the multi-row file are inserted through the hollow shaft. Inside the hollow shaft, By integrating the wind support structure (hybrid support structure), large-scale axial load and lateral load acting on the concrete base can be directly transferred to the foundation pile, but the section of the concrete base can be reduced and weight can be reduced.

Secondly, in order to completely integrate the hollow shaft and the multi-row pile by the grouting, a plurality of pits are provided in the lower portion of the multi-pile file to integrate the grouting inside and outside the pile file. In this case, since the lower portion of the multi-layered pile is a portion where large axial load and lateral load act, the internal stiffener as much as the pore size is installed inside and outside the multi-pile file to enable sufficient support for axial load and lateral load.

In addition, the hollow shaft and the multi-row pile are formed with strip shear connectors to effectively integrate the grouting inside and outside the multi-pile file.

Third, the concrete base is manufactured in the form of a hollow box having a hollow portion formed therein so as to facilitate transportation and operation by using buoyancy, and a hollow shaft is formed by vertically moving the hollow box body vertically so that both the foundation file and the multi- .

Accordingly,

A hollow base structure having a body portion having a hollow shaft formed to pass through the upper surface and the lower surface; A base file inserted into the hollow shaft such that the upper end is positioned inside the hollow shaft; And a TP part including a multi-row pile installed in the hollow shaft so as to be integrated with an upper end of a foundation pile in a hollow shaft, wherein a bottom end of the multi-row pile is inserted into the hollow shaft, The present invention provides an offshore wind force supporting structure using a concrete base in which a connecting portion of a concrete windshield is positioned.

Also,

(a) a concrete base including a body portion having a hollow shaft so as to pass through the upper surface and the lower surface as hollow floating structures, is seated on the seabed ground G,

(b) a foundation file is inserted into the hollow shaft so that the upper end is located inside the hollow shaft,

(c) installing a TP portion including a multi-row pile so that a lower end thereof is inserted into the hollow shaft and integrated with the upper end of the foundation pile inside the hollow shaft, wherein the plurality of hollow shaft internal The present invention provides a method for constructing an offshore wind force supporting structure using a concrete base in which a connecting portion of a foundation file and a multi-row file is positioned.

The offshore wind force supporting structure in which the multi-row pile of the present invention is combined with the lower concrete base can be formed so as to be able to effectively resist the axial load and the lateral load acting on the concrete base, And it can be easily settled to the land, the sea transportation, and the seabed so that the efficiency of production, transportation and construction and the large-scale offshore facilities can be avoided, thereby providing an economical offshore wind support structure and its construction A method can be provided.

In addition, the construction of the foundation file on the seabed surface through the concrete shaft-based hollow shaft enables the concrete base to guide the installation position of the foundation pile, thereby reducing the effort and cost required for foundation pile construction, A method can be provided.

Further, in the state that the foundation file is inserted into the hollow shaft, the multi-row file of the TP portion is inserted into the hollow shaft, and grouting is performed so that the lower portion of the multi-row file and the foundation file are integrated with each other, It is possible to provide an offshore wind force supporting structure which is more structurally stable by integrating the file and the foundation file and capable of easily connecting the foundation file and the multiple file, and a construction method thereof.

In addition, since the lower end of the multi-row pile of the TP unit is acted on both the axial load and the lateral load, it can become a vulnerable part to the working load. Accordingly, the present invention improves the integration with the grouting through the lower part of the multi-layered file and effectively reinforces the lower part of the multi-layered file through the inner and outer reinforcements.

FIGS. 1A and 1B are a plan view of a conventional offshore wind power generator,
1C is a view showing the construction of a gravity type foundation (caisson) using another conventional concrete,
FIG. 2A is a structural cross-sectional view of an offshore wind power support structure (hybrid support structure) to which an upper multi-stage file and a lower concrete base are coupled,
Figure 2b is a perspective view and cross-sectional views of the concrete base of the present invention,
2C and 2D are a perspective view and a combined perspective view of an offshore wind force supporting structure using a concrete base of the present invention,
FIGS. 2e and 2f are connection excerpts of the concrete base, multi-row file, foundation file of the present invention,
FIGS. 3A, 3B, 4A, and 4C are flowcharts of a construction procedure of an offshore wind force supporting structure using the concrete base 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.

[Concrete base (100) of the present invention]

FIG. 2A is a structural cross-sectional view of an offshore wind force supporting structure in which an upper multi-row file for lowering the power and a lower concrete base are combined, and FIG. 2B is a perspective view and a sectional perspective view of the concrete base of the present invention.

That is, the upper part of the offshore wind power supporting structure has a hybrid type (hereinafter referred to as a "offshore wind power supporting structure") in which the TP unit 200 composed of the multi-row piles 210 and the lower concrete base 100 are combined.

Therefore, in the case of an offshore wind supporting structure in which the axial load and the lateral load are dominant due to the external force of the ocean, the multi-storey pile 210 and the concrete base 100 must be completely connected to each other.

At this time, in order to secure the structural safety of the concrete base in response to the axial load and the lateral load acting on the concrete base, there is a drawback that the section of the concrete base must be thickened.

Therefore, since the weight of the concrete base 100 must be increased, it is almost impossible to move to the installation position to the sea, and there is no adequate capacity of the floating crane.

Since the concrete base 100 is required to serve as a connection part between the upper multi-layered file 210 and the foundation file 300 fixed to the seabed ground G, the foundation file connection part and the multi- It is difficult to work underwater.

In the present invention, the weight of the concrete base is drastically reduced based on the details of the concrete base which directly transfers the axial load and the lateral load acting on the concrete base to the foundation pile, and when it moves to the installation position, , It is possible to construct a small-capacity floating crane.

In addition, through the plurality of hollow shafts installed in the concrete base, the connecting portions of the foundation pile and the multi-pile pile can be unified into one place, thereby enhancing the efficiency of underwater work.

That is, the connection portions of the foundation pile and the multi-row pile are located within the plurality of hollow shafts installed in the concrete base.

The concrete base 100 of the present invention includes the body 110 and the hollow shaft 120 as shown in FIG. 2B.

The body 110 may be circular, octagonal, hexagonal, or rectangular in cross-section as a hollow floating structure, and in the case of FIG. 2b, it is a hexagonal body. It can be seen that the bottom of the body portion is formed to be in contact with the bottom surface G of the sea bottom, is formed as a flat upper surface, and the side surface is formed as a polygonal surface to effectively resist the wave force.

That is, it can be seen that the body 110 is formed by a structure including side faces of a circle, a square, a hexagon, an octagon, or the like.

In addition, since the inner cavity S is formed inside the body 110 so that buoyancy can be easily received, since the concrete is not filled as much as the space in which the inner cavity S is formed, its own weight can be drastically reduced, It is not necessary to use a large-scale marine crane at the time of hoisting after loading and transporting the marine vessel, etc., thereby ensuring sufficient economical efficiency.

A plurality of hollow shafts 120 passing through the body 110 are formed in the body 110. The hollow shaft 120 may be made of steel, for example.

Accordingly, the hollow shaft 120 slightly protrudes upward and downward from the upper and lower surfaces, and the lower portion of the hollow shaft 120 protruded from the lower surface can land on the seabed bottom plate G and can stably hold the seabed bottom G of the concrete base And the hollow shaft 120 protruding from the upper surface makes it possible to easily insert and install the multi-row pile 210.

The number of the hollow shafts 120 may be determined according to the number of the foundation piles 300 and the number of the multi-row piles 210 installed.

In the case of FIG. 2B, it can be seen that one hollow shaft is formed at the center portion and four hollow shafts are formed at the outer periphery with reference to the central portion.

The hollow shaft 120 uses a steel pipe having a diameter larger than the diameter of the multi-pile file 210 and the diameter of the foundation pile. The upper and lower surfaces of the hollow shaft 120 are provided with a cap .

[Offshore wind force supporting structure (A) using the concrete base 100 of the present invention]

2C and 2D are a perspective view and an assembled perspective view of an offshore wind force supporting structure A using the concrete base 100 of the present invention,

FIG. 2E shows a connection excerpt of a concrete base, a multi-row file, and a foundation file of the present invention.

2C, the offshore wind force supporting structure A includes a concrete base 100, a TP unit 200 having a plurality of heat pipes 210, and a foundation pile 300.

The concrete base 100 is formed as a floating structure that includes the body 110 and the hollow shaft 120 and is hollowed with the inner hollow S as described above.

4b, the TP unit 200 is a structure for connecting the upper tower 410 and the concrete base 100. The TP unit 200 includes a top plate 220 and a top plate 220, (210). ≪ / RTI >

The upper plate 220 is formed as a steel plate in the form of a horizontal plate or as a concrete bottom plate so that the upper tower 410 is connected and supported.

The multi-layered file 210 is formed to be radially extended on the bottom surface of the upper plate 220 by using a steel pipe or the like, and is composed of a center file and an outline file.

The foundation file 300 is inserted into the seabed ground G by hovering or the like, and is also installed using a steel pipe file or the like.

2d and 2e, the upper end of the foundation pile 300 and the lower end of the multi-row pile 210 are inserted into the hollow shaft 120 of the concrete base 100 to be integrated with each other, It can be seen that the inserted base file 300 and the multi-row files 210 are integrated by the grouting material 230.

The connection portions of the foundation pile 300 and the multi-pile pile 210 are unified through a plurality of hollow shafts 120 installed on the concrete base 100, so that the efficiency of underwater work can be increased.

Such a connection portion is located inside the concrete base 100, and the concrete base can be a weak portion because it acts on the load, wave power, etc. transmitted from the upper tower. When the concrete base section is made large for reinforcement of the weak portion, ) Is so large that it becomes very uneconomical in transportation and installation.

Accordingly, the present invention is characterized in that a hole 211 is formed in the lower end of the multi-layered pile 210 and the grouting material 230 is communicated through the pore 211 to ensure sufficient integrity, 212 are formed.

2E, a plurality of plate-shaped internal and external stiffeners 212 are formed on the lower inner side surface and the outer side surface of the multi-rowed file 210 in consideration of the sectional area loss due to the holes 211, and the inner and outer stiffeners 212, Thereby enhancing the composite performance with the grouting material 230 and favoring the shearing force reinforcement.

2F, a strip shear connection member 240 is disposed on the lower outer circumferential surface of the multi-row pile 210 and the inner side surface of the hollow shaft 120, and a shear groove (not shown) formed on the strip shear connection member 240 It is possible to secure the composite performance with the grouting material 230 more reliably.

However, the multi-row pile 210 integrally connected with the grouting material 230 on the hollow shaft 120 in the concrete base 100, the base pile 300 So that reinforcement by the inner and outer reinforcements 212 is enabled.

[Method of constructing the offshore wind force supporting structure (A) using the concrete base 100 of the present invention]

FIGS. 3A, 3B, 4A, and 4B illustrate a construction flowchart of an offshore wind force supporting structure using the concrete base of the present invention.

3A, the TP unit 200, the foundation pile 300, and other structures 400 and the tower unit 300, which have been described above with reference to a barge line or the like (not shown) at the sea where the offshore wind force supporting structure A is to be installed, , Nacelle, blade, etc.).

Such a barge is equipped with lifting equipment such as a crane, and the position is confirmed in advance by using a sinker block, a wire, a buoy, etc. on the underside surface (G) to which the marine support structure (A) is to be installed in advance.

At this time, in the case of the concrete base (100), buoyancy can be separately towed by using a tugboat or the like, so that marine movement can be performed, so that a small scale lifting equipment can be utilized on the barge.

First, as shown in FIG. 3A, the concrete base 100 is set at a location on the seabed ground G where the offshore wind force supporting structure A is to be installed, and is then settled. Although not shown, a method of filling seawater in the inner hollow S and separating the caps (not shown), which are placed on the upper and lower surfaces of the hollow shaft 120, may be used.

That is, the concrete base 100 is installed in such a manner that the buoyant force is used for conveying and the self-weight is sufficiently utilized by sinking to the sea by ballast action.

Also, since the bottom of the hollow shaft 120 protrudes from the bottom of the concrete base 100, the bottom of the hollow shaft 120 is buried in the seabed ground G by its own weight, which is very advantageous for initial settlement.

3b, the foundation pile 300 is inserted into the hollow shaft 120 of the concrete base 100 and the foundation pile 300 is inserted into the foundation pile 300 by a method such as hanger, To the inside of the seabed.

Since the foundation file 300 is inserted into a seabed using augering or the like and it is difficult to secure a vertical degree, the present invention can be applied to the foundation file 300 by using the hollow shaft 120 of the concrete base 100, So that the easy installation position of the guide member can be guided.

In addition, the hollow shaft 120 is formed to have a size capable of cutting the foundation pile 300 to a head, thereby making it possible to construct a more secure underwater foundation pile 300.

4A, the multi-layered pile 210 is inserted into the hollow shaft 120 of the concrete base 100 while the TP unit 200 having the multi-pile file 210 is lifted and settled.

That is, since the lower portion of the multi-row file 210 is formed in a vertical file form, it can be easily inserted into the hollow shaft 120, and the bottom surface of the multi-row file 210 is cut on the top surface of the base file 300 So that the basic file 300 and the multi-row file 210 can be vertically simplified to increase the load transfer efficiency.

The grouting material 230 is filled into the hollow shaft 120 as shown in FIG. 2E so that the multiple files 210 and the foundation file 300 are integrated into the hollow shaft 120 .

The lower end of the upper tower 410 constituting the other structure 400 is supported and connected to the upper plate 220 of the TP unit 200 exposed to the sea as shown in FIG. And it is possible to install an offshore wind power generator by mounting an energy cell and a blade.

Of course, the offshore wind power supporting structure using the concrete base according to the present invention can be used as a base part of an offshore structure other than an offshore wind power generator.

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: Concrete base
110: body part 120: hollow shaft
200: TP portion
210: Multiple files 211:
212: Internal and external stiffeners
220: upper plate part 230: grouting material
300: Foundation Files
400: Other structures 410: Upper tower

Claims (11)

A concrete base (100) including a body portion (110) having a hollow shaft (120) formed to pass through upper and lower surfaces as hollow suspended structures;
A base pile (300) inserted into the hollow shaft (120) so that the top is located inside the hollow shaft; And
And a TP unit (200) including a multi-row pile (210) inserted into the hollow shaft and integrated with a top of a foundation pile in a hollow shaft,
A plurality of hollow shafts (120) installed in the concrete base (100), and a connection portion of the foundation file and the multiple heat file is positioned inside the plurality of hollow shafts (120). The method according to claim 1,
The concrete base (100)
An offshore wind force supporting structure using a concrete base functioning as a hollow suspended structure by an inner hollow (S), the side including a circle, a square, a hexagon or an octagon. 3. The method of claim 2,
Wherein the hollow shaft (120) is formed in advance in the concrete base (100) and is formed to protrude from the upper and lower surfaces of the concrete base (100). 3. The method of claim 2,
The foundation pile 300 is inserted into the hollow shaft 120 of the concrete base 100 seated on the seabed ground G and inserted into the seabed ground G to be guided by the hollow shaft to be installed. Offshore wind support structure using. 3. The method of claim 2,
A plurality of holes 211 are formed in the lower end of the TP unit 200 so that the lower end of the TP unit 200 extends from the bottom surface of the upper plate 220 and the lower end of the TP unit 200 is inserted into the hollow shaft. Wherein the grouting material (230) filled in the hollow shaft (210) is connected to the hole (211) by forming the inner and outer reinforcements (212). 3. The method of claim 2,
A plurality of strips 210 of the TP unit 200 extend from the bottom surface of the upper plate 220 so that the lower ends of the strips 210 are inserted into the hollow shaft. The grouting material 230 filled in the hollow shaft together with the strip shear connection member 240 formed on the inner side is connected to the front end formed in the strip 211 and the strip front end connection member 240, structure. (a) a concrete base 100 including a body portion 110 having a hollow shaft 120 formed so as to pass through upper and lower surfaces as hollow floating structures is seated on a seabed ground G,
(b) a foundation pile (300) is inserted into the hollow shaft (120) so that the upper end is located inside the hollow shaft,
(c) installing a TP part (200) including a multi-row pile (210) such that a lower end thereof is inserted into the hollow shaft and integrated with the upper end of the foundation pile inside the hollow shaft,
Wherein a connecting portion of the foundation pile and the multi-pile pile is positioned within the plurality of hollow shafts (120) installed in the concrete base (100). 8. The method of claim 7,
In the step (a), the concrete base (100) is conveyed to a position where an offshore wind force supporting structure is to be installed using buoyancy, thereby constructing an offshore wind force supporting structure using the concrete base. 8. The method of claim 7,
In the step (b), the foundation file 300 is guided by the hollow shaft 120 of the concrete foundation base 100 seated on the seabed ground G and inserted into the seabed sole, A method for constructing an offshore wind support structure using a concrete base to be positioned. 8. The method of claim 7,
In the step (c)
A plurality of holes 211 are formed in the lower end of the multi-row pile 210. The multi-row pile 210 is formed by a grouting material 230 filled in the hollow shaft 120, And a grouting material (230) filled in the hollow shaft (210) with inner and outer stiffeners (212) formed around the holes (211) to communicate with the holes (211). 8. The method of claim 7,
In the step (c), the TP unit 200 is installed in the hollow shaft 120 of the pre-installed concrete base 100 so as to insert the multi- .

Images