JP2005180239A - Foundation of water surface wind power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture foundation of a water surface wind power generation device at low cost in a foundation of a wind power generation device installed on water surface such as on the sea or on a lake. <P>SOLUTION: This foundation of the water surface wind power generation device consists of steel pipe pile 1 arranged at each apex of a regular polygon in a plan view and driven in sea bottom and a steel structure stand 2 fixed by covering a pile head of each steel pipe pile 1 and supporting a base end part 4a of a strut 4 of a wind power generation part 3 with positioning the same at a center of the regular polygon. The steel structure stand 2 consists of steel pipe pole 2a fixed by covering the pile head of the steel pipe pile by a lower end thereof, a pole connection member 2A horizontally connecting upper and lower end of adjoining steel pipe poles 2a and obliquely connecting the upper end and the lower end, and a support member 2B connecting and supporting the base end part 4a of the strut 4 of the wind power generation part and the steel pipe pole 2a or the pole connection member 2A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a foundation of a wind power generator installed on the ocean such as at sea or on a lake.

  Wind power generation is attracting attention as clean energy because it does not use fossil fuels, but in Japan it has been installed almost on land. However, in Japan, where the land is small, it is difficult to find the right place because the location conditions are severe, such as being able to obtain stable wind power at all times, being far enough from densely populated areas, and not being a steep mountainous area that is difficult to install. It has become.

  On the other hand, there are many suitable sites on the ocean, except for the deep sea where installation is difficult, and offshore wind turbines are attracting attention. In the case of installing a wind power generator on the ocean, a concrete integrated tower is erected on the sea floor by on-site construction, and the wind power generator is arranged on the tower.

Further, Patent Document 1 discloses an offshore wind power generator capable of constructing a tower in a short time and at a low cost. FIG. 5 is a longitudinal sectional view of the offshore wind turbine generator disclosed in Patent Document 1.
JP 2000-213451 A

  In FIG. 5, Ga is a sandy seabed, W.M. L is the sea level. a is a tower and the upper part is the sea level W. Projecting from L. A wind power generation part g is arranged on the tower via a platform j. The wind power generation part g has a column h and a windmill i having three blades. The tower a is composed of a hollow cylindrical base block b filled with sand as a weight and a tower main body c on which a plurality of hollow cylindrical divided blocks k having successively smaller diameters are stacked. f is a connecting tool, which penetrates the plurality of divided blocks k and connects the basic block b and the platform j so that the divided blocks k do not fall apart even when subjected to a lateral load. Both the foundation block b and the division block k are made of reinforced concrete, the foundation block b has a top wall and a bottom wall, and the division block k has a ceiling wall.

  m is a fall prevention frame, is made of reinforced concrete, and is embedded in a sandy seabed Ga perpendicularly so that the upper part projects upward from the sandy seabed Ga, and the frame body d And the eaves e extending horizontally in the sandy seabed Ga from the outer peripheral surface of the frame, the frame body d prevents the sand from being dissipated by the weight of the tower a, and the eaves e prevents the tower a from tilting. It is preventing. As shown in the figure, the foundation block b of the tower a is inserted in the upper part of the fall prevention frame m.

  FIG. 6 is a drawing of another embodiment of the offshore wind power generator apparatus disclosed in Patent Document 1 as well. When the seabed is a rocky seabed Gb, the fall prevention frame m as shown in FIG. 5 is not necessary. If the surface of the rocky seabed Gb is excavated flatly and the foundation block b is placed thereon, Good.

  In the offshore wind turbine generator described above, the frame body d in FIG. 5 is a foundation called an open caisson, and the foundation block b in FIG. 6 is a foundation called an installed caisson. The installation caisson is a box with a closed bottom. After building in the caisson yard, the ship is towed on the water, and when it reaches a predetermined position, the inside of the enclosure is filled with water and submerged and installed on the seabed. . The installed caisson can be applied to rocks that can be excavated from the foundation of the seabed or non-scoured compacted sand. The caisson is installed as it is after the surface of the sea floor is finished flat.

  The open caisson in Fig. 5 is also called a well, built in the caisson yard, attached to a temporary base and towed to a predetermined position, submerged there, removed the temporary base, and then excavated from inside the enclosure. Set it down. Open caisson can be applied to any ground of soft clay, silt, sand and gravel. When the caisson reaches a predetermined depth, the earth and sand are thrown into the excavated interior.

  As described above, in the case of an installed caisson (see Fig. 6), excavation for leveling the seabed is required, and in the case of an open caisson (see Fig. 5), excavation for sinking the caisson is required. Both of which require extensive construction for drilling the seabed. In addition, although the wind power generator itself is not so heavy, it generates electricity by crosswind, so a large overturning moment works. Therefore, in order to counter the overturning moment, the caisson must be increased in weight and the bottom area must be increased. Furthermore, the construction of large concrete structures on the sea floor has a considerable impact on marine organisms and fish.

  The present invention has been devised in view of such problems of the prior art, and does not require seabed excavation work, can cope with a large overturning moment, and can be used as a fishing reef and is an environmentally friendly offshore wind turbine generator The purpose is to provide a basis for

  In order to achieve the above object, the foundation of the offshore wind power generator of the present invention is fixed by covering a steel pipe pile placed at each vertex of a regular polygon in a plan view and driven into the seabed, and a pile head of each steel pipe pile. A base of an offshore wind power generator comprising a steel gantry that supports the base end of the column of the wind power generator positioned at the center of the regular polygon, the steel gantry having a lower end at each steel pipe pile A steel pipe column that is fixed over the pile head, a column connecting member that connects the upper and lower ends of adjacent steel pipe columns horizontally and diagonally connects the upper end and the lower end, and each steel pipe column or the column connecting member It comprises a support member that connects and supports the base end of the column of the wind power generation unit.

  The polygon is preferably a regular polygon.

The regular polygon is a regular hexagon, and the support member is a horizontal member that connects an upper end and a lower end of the steel pipe column and a base end portion of a column of the wind power generation unit, an upper end of the steel tube column, and the wind power generation It is preferable that it consists of the diagonal material which connects the lower end of the support | pillar of a part diagonally.

  The operation of the present invention will be described below. The foundation of the offshore wind power generator of the present invention supports a steel gantry by a steel pipe pile and is not directly installed on the seabed, so that excavation work for sinking the seabed leveling and caisson is not required like conventional caisson. As a result, man-hours can be reduced and the cost can be reduced. The overturning moment due to the lateral load applied to the wind power generation unit is handled by the difference between the pulling force and the pushing force of the steel pipe pile, which eliminates the need for a large dead weight and a large bottom area like a caisson, thereby reducing the construction cost. . Since the piles are arranged at each vertex of the regular polygon in plan view, the pulling force and pushing force applied to each pile are equal even if the wind blows from any direction of the straight line connecting each vertex and the center, and safety against falling Is expensive.

  Furthermore, because the steel gantry is a structure that combines steel columns and steel beams, there is a large gap between them, and it is an environmentally friendly foundation that can coexist with the fishery as an excellent reef.

  As described above, the foundation of the offshore wind power generator of the present invention supports the steel gantry by the steel pipe pile placed on the sea floor, so that excavation work on the sea floor is unnecessary and the cost can be reduced, and the falling moment is reduced. Safety is high because it is handled by the pulling force of the pile. In addition, the steel gantry has an excellent effect such as an excellent reef because it is a structure in which steel columns and steel beams are combined.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of an offshore wind power generator having the basis of the present invention, and FIG. 2 is a view taken along the line AA of FIG. In the figure, G is the seabed. Reference numeral 1 denotes a steel pipe pile, which is arranged at each vertex of a regular polygon (a regular hexagon in this embodiment) in a plan view and driven into the seabed G. In this figure, the offshore wind power generator is assumed to have a large size of 2000 to 2500 KW, and according to the calculation, it is considered sufficient if there are about 5 piles having a thickness of 1 to 1.4 mΦ. For pile driving, use a pile driving ship equipped with a leader on a dedicated pile driving ship or a hoist ship. Pile boats use a type that allows a hammer to fall on the ship, a diesel hammer, or a hydraulic hammer. Attach a cap or cushion to the pile head to reduce the impact of the hammer on the pile head.

  2 is a steel gantry and 3 is a wind power generation unit. The wind power generation unit 3 includes a windmill 5 having three blades and a steel pipe support 4 that supports the windmill 5. The steel gantry 2 is fixed by covering the lower end of each pile with the pile heads, and the base end 4a of the support column 4 is positioned at the center of the regular hexagon.

  The steel gantry 2 has six steel pipe columns 2a that are fixed so that the pile head of the steel pipe pile 1 is inserted into the lower end. The upper ends of adjacent steel pipe columns 2a are connected horizontally by an upper connecting member 2c made of steel pipe, the lower ends are connected horizontally by a lower connecting member 2b made of steel pipe, and the upper and lower ends are connected by an oblique connecting member 2d. Has been. The column connecting member 2A is constituted by the upper connecting member 2c, the lower connecting member 2b, and the oblique connecting member 2d.

  2B is a support member that connects and supports each steel pipe column 2a and the base end portion 4a of the column 4. The support member 2B is an upper support 2e that horizontally connects the upper end of the steel pipe column 2a and the base end 4a of the support column 4, and a lower support that connects the lower end of the steel tube column 2a and the base end 4a of the support column 4 horizontally. It consists of the material 2f and the diagonal support material 2g which connects the upper end of the steel pipe pillar 2a and the lower end of the base end part 4a of the support | pillar 4 diagonally. By providing the diagonal connecting member 2d and the diagonal support member 2g, the surface formed by joining the members becomes a triangle, the bending moment of the node is greatly reduced, and the resistance to the overturning moment is increased. 6 is a flange. The flange 6 is composed of a lower flange 6a attached to the pile head of the steel pipe pile 1 and an upper flange 6b attached to the lower end of the steel pipe column 2a. The upper and lower flanges 6a and 6b are fastened with bolts and nuts. The steel pipe column 2a is fixed to the pile head of the steel pipe pile 1.

  Next, the operation of this embodiment will be described. First, the bottom of the sea is investigated, and steel pipe piles with a thickness of 1 to 1.4 mΦ are driven into each apex of the regular hexagon in plan view. The length of the regular hexagonal diagonal is about 8-10m. On the other hand, the steel gantry 2 and the base end side of the support column 4 are manufactured integrally on land, and the wind turbine 5 is attached to the tip end side of the support column 4. The length of the base end side of the support column 4 is set such that the upper end protrudes above the water surface when installed. The steel gantry 2 and the base end of the column 4 are integrated on the ship, carried on the ship, lifted by a crane ship, and fixed to the pile head over the pile head of the steel pipe pile 1 driven into the seabed. install. The upper end on the base end side and the lower end on the front end side of the support column 4 are welded or joined by flange at the sea to complete the installation.

  As described above, the foundation of the offshore wind power generator of the present invention supports the steel gantry 2 by the steel pipe pile 1 and is not directly installed on the seabed G. Therefore, the ground leveling or caisson of the seabed G is subtracted like a conventional caisson. This eliminates the need for excavation work, which can reduce the number of man-hours and reduce costs. The overturning moment due to the lateral load applied to the wind power generation unit 3 is handled by the difference between the pulling force and the pushing force of the steel pipe pile 1, so there is no need for a large dead weight or a large bottom area like a caisson, and construction costs can be reduced. become. Since the steel pipe piles 1 are arranged at each vertex of the regular polygon in plan view, the pulling force and pushing force applied to each pile 1 are equalized even if the wind blows from any direction of the straight line connecting each vertex and the center. High safety against

  Furthermore, since the steel gantry 2 is a structure in which steel pillars and beams are combined, there is a large gap between them, and it is an environmentally friendly foundation that can become an excellent reef and coexist with the fishery.

  3 and 4 are drawings of another embodiment of the foundation of the offshore wind power generator of the present invention, FIG. 3 is a side view, and FIG. 4 is a plan view. The foundation shown in FIGS. 3 and 4 differs from the foundation shown in FIGS. 1 and 2 in that six steel pipe piles 1 are used in FIGS. 1 and 2 and are arranged at the apexes of a regular hexagon. On the other hand, in FIG. 3 and FIG. 4, four steel pipe piles 1 are used and arranged at each vertex of the square, and the others are the same, so only different points will be described and description of common parts will be omitted.

  The steel gantry 2C is a bowl-shaped frame, and the adjacent steel pipe columns 2a and 2a are connected to each other by an upper connecting member 2c, a lower connecting member 2a, and an oblique connecting member 2d at the upper and lower ends. Adjacent upper connecting members 2c, 2c and lower connecting members 2b, 2b are connected to each other by a connecting member 2h at the center, and the four connecting members 2h form the upper connecting member 2c or the lower connecting member 2b. A small square inscribed in the square is formed. Further, the adjacent connecting members 2h and 2h are connected to each other by the connecting member 2i at the center portion, and the four connecting members 2i form a small square inscribed in the square formed by the connecting member 2h. Support members 2j and 2k extend horizontally and obliquely from the central portions of the upper and lower connecting members 2h and 2i and are fixed to the side surface of the base end portion 4a of the support column 4 to support the support column 4.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention. For example, the arrangement of the steel pipe piles is not limited to a square or a regular hexagon, but may be a regular triangle, a regular pentagon, a regular octagon, or the like.

It is a side view of the offshore wind power generator which has the foundation of the present invention. It is an AA arrow line view of FIG. It is a side view of the foundation of the offshore wind power generator of other embodiments of the present invention. It is also a plan view. It is a longitudinal cross-sectional view of the conventional offshore wind power generator. It is a partial longitudinal cross-sectional view of the conventional offshore wind power generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2, 2C Steel frame 2a Steel pipe pillar 2A Column connection member 2B Support member

Claims (3)

A steel pipe pile placed at the top of each polygon in plan view and driven into the seabed, and fixed over the pile head of each steel pipe pile, and the base end of the column of the wind power generation unit is positioned at the center of the polygon An offshore wind turbine generator comprising a steel gantry that is supported by the steel gantry, the steel gantry having a steel pipe column that is fixed by covering the bottom of each steel pipe pile with the lower end of the steel pipe column, and upper and lower of adjacent steel pipe columns. A column connecting member that connects the ends horizontally and obliquely connects the upper end and the lower end, and a support member that connects and supports each steel pipe column or the column connecting member and the base end of the column of the wind power generation unit. The foundation of an offshore wind power generator characterized by comprising The foundation of the offshore wind turbine generator according to claim 1, wherein the polygon is a regular polygon. The regular polygon is a regular hexagon, and the support member is a horizontal member that connects an upper end and a lower end of the steel pipe column and a base end portion of a column of the wind power generation unit, an upper end of the steel tube column, and the wind power generation The foundation of the offshore wind power generator of Claim 2 which consists of the diagonal material which connects the lower end of the support | pillar of a part diagonally.

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