KR101963233B1 - Pile foundation for marine wind power station - Google Patents

Abstract

The present invention relates to a pile foundation for a wind power generator for supporting a lower part of an offshore wind power generation system, and comprises a base plate having a plate-shaped structure of a predetermined shape and a support pile having a predetermined length penetrating the base plate to fix the base plate A plurality of fixing pins are protruded from the bottom surface at predetermined intervals so that the base plate can be inserted and fixed on the underside base plate and a pile hole having a predetermined size is formed so as to fit the supporting pile at the center of the surface, A plurality of screw threads are formed on the column surface so as to be able to be inserted into the underside base roll, and driver grooves or protrusions of a negative (-) or cruciform (+) shape are formed on the top surface of the head. Since the pile foundation for offshore wind power generation of the present invention is a non-silent and non-vibration-based non-clay method, it is very eco-friendly because it does not use concrete. It is a method in which a pile foundation, It is fast and has the effect of shortening the air and reducing the cost.

Description

{PILE FOUNDATION FOR MARINE WIND POWER STATION}

The present invention relates to a structure for supporting a turbine foundation of an offshore wind power generation system, in particular, a pile for offshore wind power generation designed to resist a horizontal load due to a force or a conduction moment transmitted from wind or waves, and an axial load due to the self weight of the wind turbine itself It is about the foundation.

Today, the excessive use of fossil fuels is accelerating global warming as the amount of carbon dioxide that causes greenhouse gases increases sharply. Therefore, the international community regulates the amount of greenhouse gas emissions from each country through various international agreements in order to prevent disasters such as weather changes due to global warming. In recent years, interest in renewable energy, a renewable energy alternative to fossil fuels, has been rising, and research is being actively conducted.

These renewable green energy production methods include solar power generation, tidal power generation, geothermal power generation, and wind power generation. They have natural constraints and are less economical than fossil energy. However, they are environmentally friendly, And it is attracting attention as alternative energy in terms of solving environmental pollution problems.

Among these new energy sources, wind power generation, which is a representative green energy, is a pollution-free energy source and it is very economical because the maintenance and repair cost among current alternative energy is lowest. Such wind power generation is a technology to convert wind power into electrical energy and supply the generated power directly to the power system or the consumer. If such a wind power generation is utilized, it will be possible to utilize the land of mountains, coastal estuary, You can increase it.

Due to these advantages, wind power generation systems are recognized as the most promising alternative energy sources, and already around 32,154 MW (cumulative at the end of 2002) wind power generation systems are installed and used worldwide. In Korea, too, there is a strong interest in wind power generation systems in response to changes in the international environment such as the Global Climate Change Convention, rising oil prices, and realistic problems relying on imports of 96% of domestic energy.

In particular, the wind power generation system has been rapidly introduced in recent years because it can be easily operated and managed, and can be unmanned and automated.

Wind power generation is already in operation in domestic as well as overseas. Due to the enlargement of the wind turbine and the expansion of the complex due to the expansion of the power generation capacity, the trend is shifting from offshore wind power generation to offshore wind power generation. Especially, it is desirable to place the wind turbine generator at a place where the wind speed is fast and the direction is constant according to the time and season. Therefore, there is no restriction on aesthetics or place rather than land, and a wind turbine .

The offshore wind power generation system has a relatively high portion of the project cost for the offshore structure than the turbine, so that the construction and installation cost of the foundation structure accounts for at least 30% of the total cost and 50% when the depth is deepened.

Generally, an offshore wind power generator is supported by a foundation support whose lower portion is installed on the sea floor. The base support is formed in a substantially cylindrical shape so as not to be resisted by the flow of seawater. Due to the characteristics of the wind turbine installed on the sea, the cylindrical base support is supported by a wind load exerted from the outside, (Yaw Moment) occurs, so that the base support may rotate.

If the foundation support rotates, the power supplied to the wind turbine is deteriorated to deteriorate the power generation efficiency of the wind turbine generator. In addition, the stability of the wind turbine generator deteriorates due to the rotation of the foundation support.

On the other hand, when the foundation support meets with the flow of the seawater, part of the seawater that flows is forming a bottom stream or a vortex due to the foundation support. In the sea floor, as shown in Fig. 1, a base support supporting the upper structure and a flowing sea water meet, and generate a down stream (D) falling down from the front support of the base support to the base support. In addition, a horseshoe vortex (V) is formed in the lower periphery of the base support which meets the flowing sea water. Since the outcrops (D) and horseshoe vortex (V) occur repeatedly and repeatedly, they act on the bottom of the base of the foundation with a force of more than marginal power, resulting in a scour phenomenon that gradually breaks out.

Conventionally, in order to prevent such a scouring phenomenon, a method of laying stones around a foundation support, covering a concrete mat or making a gravity type concrete foundation structure has been used, and this method has a lot of installation cost and installation time . In addition, since the horseshoe vortex and the outflow are continuously generated by the flow of seawater, the conventional stones and concrete mat are also worn out to continue the scouring phenomenon. In the gravity type concrete foundation structure, the scale is large and the weight of the main body is excessive There is a drawback that it is not suitable for the terrain where the settlement of the soft ground occurs due to the increase of transportation and installation costs.

The present invention has been developed in order to solve the above-mentioned problems of the related art, and it is an object of the present invention to reduce the amount of concrete used in supporting a turbine foundation of an offshore wind power generation system, The purpose of the present invention is to provide a pile foundation for offshore wind power generation.

In order to achieve the above-described object, the present invention provides a wind power generation system comprising: a foundation plate having a predetermined plate-like structure for supporting a lower portion of a wind power generation system; and an offshore wind power Provide a power pile foundation. According to the present invention, a base plate is provided with a plurality of fixing pins protruding at regular intervals on a bottom surface thereof so as to be able to be fixed to the underside base plate, a pile hole having a predetermined size to fit the supporting pile at the center of the surface, A plurality of screw threads are formed on the surface of the column so that the screw can be rotated and inserted into the underside base, and a driver groove or protrusion of a positive (-) or a cross (+) shape is formed on the top surface of the head. In addition, the base plate has a tapered shape as the diameter of the pile is gradually narrowed toward the lower side of the thickness, and the support pile has an inverted conical shape corresponding to the recessed portion, And the head portion of the support pile is inserted into the recessed portion and is in close contact with the tapered inner wall of the pile hole while at least part of the head portion is supported by the ground sheet.

According to the present invention, each base plate is provided with a plurality of corresponding flanges for connecting the base plates in each direction so as to form a group pile foundation by connecting a plurality of base plates. In the case of a base plate having a rectangular shape, Two or more flanges are formed on each of two adjacent side surfaces of the adjacent base plates and two or more flanges are formed on the bottom of the remaining adjacent sides respectively so that the upper flange and the lower flange overlap each other As shown in FIG.

As another example, in the present invention, the base plate has a plurality of protrusions formed in a tapered inner wall surface of the pile in one direction, and the protrusions form a sawtooth structure having a depressed (or embossed) The support pile has a plurality of stepped protrusions formed on a circumferential surface of the head portion in a direction opposite to the protrusions of the base plate, and the protrusions are formed in a serrated shape (or engraved) shape corresponding to the protrusions of the base plate Respectively. In the case of the supporting pile, the respective locking projections are sequentially stepped in the screw-tightening direction so as to be engaged with the screw threads of the supporting pile, In the case of the base plate, the respective locking projections are sequentially stepped in the screw releasing direction so that the engaging protrusions of the base plate and the supporting pegs So that the rotation of the support pile in the release direction is prevented.

According to the above-described features, the present invention can reduce the amount of concrete used in supporting a turbine foundation of an offshore wind power generation system, and is environmentally friendly. In addition, the pile foundation, which is standardized by using a certain equipment, It is possible to reduce the construction cost because the construction speed is faster than the existing concrete foundation.

Further, the present invention is designed to resist horizontal load due to force or conduction moment transmitted from wind or wave, and axial load due to own weight of the wind turbine itself, so that it can be loaded immediately after construction, easy slope construction, In case of modularized process, it is possible to reduce cost and shorten the time.

1 is a view showing an example of a conventional pile foundation for offshore wind power generation,
2 is a perspective view of a pile foundation for offshore wind power generation according to the present invention,
Fig. 3 shows a front view (a), a plane (b) and a section (c) of the support pile of Fig. 2,
Fig. 4 is a view showing a plane (a), a side view (b) and a sectional view (c) of the base plate of Fig. 2,
FIG. 5 is a flowchart showing the construction process of the pile foundation for offshore wind power generation in FIG. 2,
6 is a front view (a), a plan view (b), and a sectional view (c) of a pile foundation for an offshore wind power generator of FIG. 2,
7 is a view showing a modification of a pile foundation for offshore wind power generation according to the present invention.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

In the following description of the present invention, the same reference numerals are used for the same or similar components throughout the entirety of the drawings, and detailed description thereof will not be repeated. It will be omitted.

FIGS. 2 to 4 are views showing the pile foundation for offshore wind power generation according to the present invention, the shape and structure of the support pile and base plate constituting the pile foundation, and FIG. 5 is a view showing the construction process of the pile foundation for offshore wind power generation according to the present invention Fig.

In general, pile foundations are deep foundations used as the foundation for supporting structures when a high quality geological layer is deep, but the most well-used is the pile foundation. The pile foundation is almost used as the foundation of the structure in order to have excellent characteristics such as the reliability of the supporting force, the workability, and the economic efficiency. Because of the structural characteristics of the pile, it is easy for the horizontal resistance to be a weak point relative to the vertical resistance. Therefore, if the horizontal load acts on the pile, it is necessary to thoroughly examine the displacement or bending stress to prevent the stability of the structure. Do.

The pile foundation for offshore wind power generation of the present invention comprises a base plate 10 as a means for supporting the lower part of the wind power generation system and a support pile 20 for fixing the foundation plate to the bottom floor of the sea floor. The base plate 10 is a plate-like structure having a constant area. The base plate 10 has a plurality of fixing pins 11 protruding from the bottom surface at a predetermined interval to sandwich the support pile 20 at the center. A pile hole 12 of a predetermined size is formed.

The base plate 10 has a predetermined thickness, and the diameter of the pile hole 12 becomes gradually narrower toward the lower side of the thickness, so that a tapered trough can be formed. The support pile 20 is also supported by the head portion 21 in correspondence with the shape of the pile 12 in order to hold the exact center of the pile 12 when the support pile 20 is inserted ) Is broad in the upper part and narrow in the lower part. The shape of the head 21 of the support pile 20 makes it possible to utilize the supporting force of the paper sheet to the utmost and the head 21 of the support pile is inserted into the tile of the pile shaft 12 And is preferably received in a state of being in close contact with the inner wall 12a.

The support pile 20 can be variously shaped so that it can be put into the field, but in the case of the present embodiment, the support pile 20, which is standardized by using a predetermined driver device (not shown), is rotated A method of intruding and fixing will be described as an example.

Here, the support pile 20 has an external appearance similar to a screw, and a plurality of threads 22a are formed on the surface of the column 22 and the upper surface 22a of the head 21 (-) or a cross (+) type driver groove or protrusion 21a can be formed on the surface of the substrate. Through such a structure, the support pile 20 is suppressed from being swayed while penetrating into the paperboard, thereby reducing the resistance and increasing the accuracy of installation and the acceptability of the pile.

In the construction of the pile foundation of the present invention having the above construction, first, the base plate 10 is fixed to the base paper of the installation position, and then the support pile 20 is directly set in the center of the pile hole 12, The support pile 20 is rotated and penetrated using equipment (not shown). The head portion 21 of the post-penetration support pile maintains a state in which the head portion 21 is in close contact with the recessed portion of the pile hole 12 while at least part of the head portion 21 is supported on the ground.

The construction of the pile foundation of the present invention is environmentally friendly because it does not use concrete as a noiseless and vibration-free method of non-cultivation method, and can be applied immediately because it has little influence due to season and climatic conditions and does not require a curing period . In addition, slope construction is easy and can be reused after demolition. Especially, when it is connected with steel structure, it is possible to reduce cost and air by modularized process. In addition, it is very effective when the installation of large-scale area is required because of the nature of the construction of new and renewable energy facilities, and the standardized method does not require processes such as site preparation and soft ground treatment required for foundation installation.

FIG. 6 shows a group pile installation method in which a plurality of pile foundations for offshore wind power generation in FIG. 2 are connected. At least four base plates 10 are arranged in a checkerboard pattern.

The base plates 10 may be provided in a plate-like structure having a constant thickness in the form of a square or a rectangle. A plurality of corresponding flanges 13 and 14 for connecting the base plates 10 to each other are formed It has a protruding shape.

For example, two or more flanges 13 may be formed on two adjacent sides of four sides of the base plate 10, respectively, and two or more flanges 14 may be formed on the bottoms of the remaining adjacent sides. The corresponding flanges 13 and 14 are constructed such that the upper flange 13 and the lower flange 14 are in contact with each other between the side surfaces of the adjacent base plates 10 and the plurality of base plates 10, It is possible to form a group pile foundation by connecting and fixing the upper flange 13 and the lower flange 14 by using fastening means 15 such as a bolt and a nut in a state where the upper flange 13 and the lower flange 14 are overlapped with each other.

The so-formed group pile foundation is very stable as a foundation of a wind power generation system that receives repetitive horizontal loads due to forces or conduction moments transmitted from the wind or waves. In particular, it is designed to resist the axial load due to the weight of the wind turbine itself, Safe installation and installation of wind power system is possible.

In the meantime, in the present embodiment, the shape of the base plate is shown as having a square or rectangular plate-like structure. However, it is needless to say that the base plate may be provided in another polygonal shape such as a triangle, a pentagon or a hexagon.

7 is a view showing a modification of the pile foundation for offshore wind power generation according to the present invention. The base plate 10 includes a plurality of locking projections 12b which are stepped in one direction on an inclined inner wall surface of the pile hole 12, And the engaging projections 12b form a saw-tooth-like structure in the vicinity of the pile hole 12 at an engraved (or embossed) shape. The support pile 20 may have a plurality of protrusions 21b formed on the circumference of the head 21 in a direction opposite to the protrusions 12b of the base plate 10, These engaging projections form a serrated structure of embossing (or engraving) corresponding to the engaging projections 12b of the base plate 10. [

As described above, the stepped direction of the engagement protrusions 12b of the base plate 10 can be a dentition structure formed in a direction opposite to the engagement protrusions 21b of the support pile 20 and engaged with each other so as to engage with each other. In the case of the supporting pile 20, the respective locking projections 21b are sequentially stepped in the screw tightening direction to form the locking wall in the screw releasing direction, and in the case of the base plate 10, the respective locking projections 12b Are sequentially stepped in the screw releasing direction to form the engaging wall with respect to the screw tightening direction.

The support pile 20 is penetrated into the underside G so that the engagement protrusions 21b of the support pile and the engagement protrusions 12b of the base plate 10 are engaged with each other, Even if a predetermined releasing force acts on the pile 20 itself due to the application of the force to the pile base of the present invention, the locking projections 12b of the base plate 10 and the locking projections 21b of the supporting pile 20 It is possible to prevent the support pile 20 caught by the engagement projection 12b of the base plate 10 from rotating in the release direction.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims.

10: Base plate
11: Fixing pin
12: Pile hole
20: support pile
21: Head
12a: inner wall
22: Column
22a:
21a: groove or projection
15: fastening means
12b, 21b:

Claims (5)

A foundation plate having a predetermined plate-like structure for supporting a lower portion of the wind power generation system, and a support pile having a predetermined length penetrating the underside base plate for fixing the foundation plate, A plurality of fixing pins are protruded at a predetermined distance on the bottom surface and a pile hole having a predetermined size is formed so as to sandwich the supporting pile at the center of the surface of the pile. A plurality of screw threads are formed and screw holes or protrusions of a negative (-) or cross (+) shape are formed on the top surface of the head,
Wherein the base plate has a tapered shape as the diameter of the pile is gradually narrowed toward the lower side of the thickness, and the support pile has an inverted conical shape in which the upper portion of the head portion is wide and the lower portion thereof is narrower corresponding to the recessed portion Wherein the head portion of the supporting pile is inserted into the recessed portion while being at least partly supported by the ground sheet and is closely attached to the tapered inner wall of the pile hole,
Each base plate has a plurality of corresponding flanges for connecting the base plates in each direction so that a plurality of foundation plates can be connected to form a group pile foundation. In the case of a base plate having a rectangular shape, At least two flanges are formed on the upper side and two or more flanges are respectively formed on the lower side of the remaining adjacent side so that the upper flange and the lower flange are fastened to each other in a state in which the upper flange and the lower flange are in contact with each other A pile foundation for offshore wind power generation. delete delete The method according to claim 1,
The base plate has a plurality of protrusions protruding in one direction on an inclined inner wall surface of the pile, and the protrusions form a saw-tooth structure of a depressed (or embossed) shape around the pile, A plurality of stepped protrusions are formed on the circumferential surface in a direction opposite to the protrusions of the base plate and the protrusions form a serrated structure corresponding to the protrusions of the base plate. Pile foundation for offshore wind power generation. 5. The method of claim 4,
The stepped protrusions of the base plate are formed in a direction opposite to the protrusions of the support pile so that they can engage with each other. In the case of the support pile, each of the protrusions is stepped in the screw tightening direction, And in the case of the base plate, the respective locking projections are sequentially stepped in the screw releasing direction to form a locking wall with respect to the screw tightening direction. From the structure in which the locking projections of the base plate and the supporting pile Wherein the support piles are prevented from rotating in the unclamping direction by engaging the support piles in mutually corresponding directions.

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