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NL2003648C2 - Foundation for an offshore windmill as well as offshore windmill system, having such a foundation. - Google Patents

Foundation for an offshore windmill as well as offshore windmill system, having such a foundation. Download PDF

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Publication number
NL2003648C2
NL2003648C2 NL2003648A NL2003648A NL2003648C2 NL 2003648 C2 NL2003648 C2 NL 2003648C2 NL 2003648 A NL2003648 A NL 2003648A NL 2003648 A NL2003648 A NL 2003648A NL 2003648 C2 NL2003648 C2 NL 2003648C2
Authority
NL
Netherlands
Prior art keywords
foundation
transition piece
modular
windmill
length
Prior art date
Application number
NL2003648A
Other languages
Dutch (nl)
Inventor
Wybren Everen Vries
Original Assignee
Univ Delft Tech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Univ Delft Tech filed Critical Univ Delft Tech
Priority to NL2003648A priority Critical patent/NL2003648C2/en
Application granted granted Critical
Publication of NL2003648C2 publication Critical patent/NL2003648C2/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/027—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto steel structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0004—Nodal points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • F03D13/22—Foundations specially adapted for wind motors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0039—Methods for placing the offshore structure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/006—Platforms with supporting legs with lattice style supporting legs
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0056—Platforms with supporting legs
    • E02B2017/0073—Details of sea bottom engaging footing
    • E02B2017/0078—Suction piles, suction cans
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0091—Offshore structures for wind turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
    • F05B2240/912—Mounting on supporting structures or systems on a stationary structure on a tower
    • F05B2240/9121—Mounting on supporting structures or systems on a stationary structure on a tower on a lattice tower
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/95—Mounting on supporting structures or systems offshore
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wind Motors (AREA)
  • Foundations (AREA)

Description

Title:
Foundation for an offshore windmill as well as offshore windmill system, having such a foundation 5 The invention relates to offshore windmill systems, especially a foundation for an offshore windmill.
Description of the prior art
The invention relates to a foundation for an offshore windmill, said foundation 10 comprising a basis element and a transition piece, said transition piece having over a part of its length a hydrodynamically transparent structure protruding through the water surface.
In the discussion of whether a monopile or a jacket (or other multi-member 15 structures) or a hybrid is the most applicable for larger water depths, several combinations of these foundation concepts have been proposed.
The invention stays with a single foundation element and places the multi-member part on top of it. From an installation point of view the monopile is an attractive 20 alternative.
Monopile foundation structures for offshore wind turbines attract large hydrodynamic loads near the water surface, as the wave load is dependent on the square of the member diameter. This leads to large stresses in the foundation structure. This effect increases with increasing water depth, as the lever arm with 25 respect to the seabed increases and the outer diameter increases in order to satisfy the stiffness requirements.
In DE 102 54 100 Al a pile foundation is proposed with a transition portion of the pile having over a part of its length a hydrodynamic transparent structure and 30 being positioned at water surface. The position of the hydrodynamically transparent structure with respect to the seabed is fixed and cannot be adapted to the level of the water surface.
2
It is an object of the invention to provide a foundation for an offshore windmill with a transition piece having over a part of its length a hydrodynamically transparent structure and that can be adapted to the level of the local water surface and the height of the foundation base above sea bed..
5
Disclosure of the invention
In accordance with one aspect of the present invention the transparent structure of the transition piece is formed by a truss structure, the transition piece is a modular part of the foundation and, the length of the modular transition piece is determined 10 by the length of the basis element of the foundation above sea bed in relation with the local water depth.
The invention solves the problem by substituting the single member transition piece by a truss structure with the appropriate stiffness characteristics. The 15 invention is an effective way of reducing the wave loads, while still maintaining the ease of installation associated with the monopile. The truss is by its very nature a stiff and yet light structure of which the diameter of the individual members are small compared to the overall (cross-wise) dimensions. Hence the combined wave loads on the individual members are significantly lower than the wave load on an 20 equivalent single member transition piece. A transition piece transfers the loads from the turbine to the foundation pile and allows the correction of non-verticality of the pile. The invention holds both functions and reduces the wave loads by its nature of a transparent structure, in other words, the waves can “pass through” it. This allows the construction of an overall lighter structure, reducing fabrication 25 and installation costs.
The modular transition piece of the foundation of the invention may comprise at a lower portion interface means, adapted to be installed at the basis pile of the monopile foundation in a conventional manner. Preferably these interface means of 30 the lower portion of the modular transition piece comprise a conical or cylindrical ring. Through mass-production of the interface means and the entire transition piece the costs of assembling the structure can be reduced.
3
According to another aspect the invention relates to an offshore windmill system, having a foundation with a basis element, and tower carrying the windmill, the foundation being connected with the tower of the windmill and having over a part of its length at the location of a transition piece a hydrodynamically transparent 5 structure, being positioned at water surface, the transparent structure of the transition piece is formed by a truss structure and the transition piece is a modular part of the foundation, interconnecting the basis element and the tower, the length of the modular transition piece is determined by the length of the basis element of the foundation above sea bed in relation with the local water depth.
10
Brief description of the drawings
Figure 1: A schematic side view on an offshore windmill with a monopile foundation, comprising a modular transition piece according to the invention, 15 Figure 2: A schematic side view on the monopile foundation with the modular transition piece just before mounting on the foundation,
Figure 3: A schematic side view on the monopile foundation with the modular transition piece mounted on the foundation, 20
Figure 4: An enlarged schematic side view on the modular transition piece,
Figure 5: A section of the modular transition piece in fig. 4 along lines V-V, 25 Figure 6: A section of the modular transition piece in fig. 4 along lines VI-VI,
Figure 7: A section of the modular transition piece in fig. 4 along lines VII-VII and an enlarged part of this section, 30 Figure 8: An enlarged schematic side view on the modular transition piece in two different lengths, the transition piece consisting by way of example of two and four modules, 4
Figure 9: A schematic side view on two offshore windmills with a monopile foundation, comprising a modular transition piece according to the invention in two different lengths, 5 Figure 10: A schematic side view on an offshore windmill according to another embodiment with a suction can foundation comprising a modular transition piece;
Figure 11: A schematic side view on an offshore windmill according to another embodiment with a gravity based foundation comprising a modular transition 10 piece.
Description of the embodiments.
As shown in fig. 1, in accordance with the present invention an offshore windmill system 1 comprises a foundation 2 and a windmill 3. The foundation 2 comprises a 15 basis pile 4 and a transition piece 5. The transition piece 5 is modular part of the foundation, has over a part of its length a hydrodynamic transparent structure formed by a truss structure 6 with appropriate stiffness characteristics and yet light structure. The truss structure is protruding through the water surface. The transition piece 5 comprises at a lower portion interface means, formed by a conical 20 or cylindrical ring 7 with a fixed diameter and intended to be installed by moving in direction of arrow A at an upper portion 8 of a conical part 9 of the basis pile 4 of the foundation in a conventional manner (see fig.’s 2 and 3). This upper portion 8 has a fixed diameter and a conical structure and is adapted to receive and to be connected with the ring 7 of the lower portion of the modular transition piece 5.
25
As shown in more detail in fig.’s 4-8, the modular transition piece 5 comprises between an upper portion 10 and the ring 7 a main section 11 with a number of vertical tubular elements 12 with a symmetrical structure. Shown are four tubular elements 12, but in accordance with the invention different numbers of tubular 30 elements with a symmetrical structure, such as three, are possible. The tubular elements 12 are interconnected by brace elements 13 forming the hydrodynamic transparent truss structure 6. The dimensions of the elements 12 and 13 are standardized to allow mass production.
5
As shown in fig. 8 the main section 11 of left transition piece 5 with a total length LI consists by way of example of two modules Ml, M2, whereas the right transition piece 5 with a total length L2 consists of four modules Ml, M2, M3, M4. Each module comprises a number of elements 12, 13 with standardized dimensions.
5
The tubular elements 12 extend parallel to each other and are converging at the upper parts 12a and lower parts 12b, interconnecting the main section 11 with the upper portion 10 and with the ring 7 of the lower portion of the modular transition piece 5.
10 The modular transition piece 5 is provided with guiding means for guiding cables 14. This is shown by way of example in fig.7. These guiding means are part of at least one of the tubular elements 12. More tubular elements may provide this cables guiding function.
15 The upper portion 10 of the modular transition piece 5 comprises a housing 15 for windmill equipment (not shown), provided with a door 15a and an access platform 16, located adjacent the housing 15. In a preferred embodiment the upper portion 10 comprises boat landing coupling means.
20 As shown in fig.’s 5 and 6 the housing 15 has at its upper end a cylindrical or conical shape with a diameter adapted to be connected with a base portion of a tower 17 of the windmill 3.
In accordance with the invention the length of the modular transition piece 5 is 25 determined by the length of the basis pile 4 of the foundation 2 above sea bed in relation with the level of the local water surface. Fig. 9 shows two base piles 4 both extending with a length B above the sea bed and provided with transition pieces 5 with different length LI and L2, adapted to the level W1 and W2 respectively of the local water surface S above the base pile. Since the transition pieces 5 consist of 30 several modules M, each consisting of three or four vertical elements 12 linked by a number of brace elements 13, the length can be adapted. The number of modules M of a transition piece 5 is determined by the local water depth at the site where the support structure will be installed in combination with the expected highest surface elevation and the height of the foundation base 4 above sea bed. Thus by 6 determining the length of the transition piece 5 L1,L2, the hydrodynamic transparent truss structure 6 of both modular transition pieces 5 is positioned at water surface S. Due to this positioning the waves can pass through the truss structure which reduces the wave loads on the monopile foundation 2. This allows 5 the construction of an overall lighter structure, reducing fabrication and installation costs of a foundation while still maintaining the ease of installation associated with the monopile.
The modular transition piece 5 is placed on top of a foundation 2, which can be 10 adjusted in the design phase to satisfy the stiffness requirements of the entire offshore support structure of the windmill 3. The preferred type of foundation shown in fig.’s 1-9 is a pile foundation, with a base pile 4 which can be installed in a conventional manner.
15 An alternative type of pile foundation 2 shown in fig. 10 is a suction can 18. By making use of pumps on the suction can 18 a difference is created between the internal pressure and the external pressure. This pressure difference drives the foundation in the sea bed to the required penetration depth. As for the pile foundation in the preceding embodiments, the suction can may be adjusted in the 20 design phase by choosing the diameter and length such that the stiffness requirements of the entire system are satisfied.
A third alternative for a pile foundation is a gravity based foundation 2. This type of structure with a foundation base 19 relies on its self weight in combination with 25 ballast to create a stable foundation.
For the invention in relation to all three foundation types, the basic principle is that the transition piece 5 comprises several modules M, each consisting of three or four vertical elements 12 linked by brace elements 13, creating a 30 hydrodynamically transparent structure. The number of modules is determined by the local water depth at the site where the support structure will be installed in combination with the expected highest surface elevation and the height of the foundation base above sea bed.
7
The detailed drawings, specific examples given, serve the purpose of illustration only. Furthermore, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the invention as expressed in the 5 appended claims.

Claims (15)

1. Fundering voor een windmolen op zee, welke fundering een basis element en een overgangsstuk omvat, welk overgangsstuk over een deel van 5 de lengte een hydrodynamisch open structuur bezit, gepositioneerd ter hoogte van het water oppervlak, met het kenmerk, dat de open structuur van het overgangsstuk gevormd wordt door een vakwerk structuur, 10. het overgangsstuk een modulair deel is van de fundering, de lengte van het modulaire overgangsstuk bepaald wordt door de lengte van het basis element van de fundering boven de zeebodem in relatie tot het diepte van het lokale water oppervlak.1. Foundation for a offshore windmill, which foundation comprises a basic element and a transition piece, which transition piece has a hydrodynamically open structure over a part of the length, positioned at the level of the water surface, characterized in that the open structure of the transition piece is formed by a truss structure, 10. the transition piece is a modular part of the foundation, the length of the modular transition piece is determined by the length of the base element of the foundation above the seabed in relation to the depth of the foundation local water surface. 2. Fundering volgens conclusie 1, met het kenmerk, dat het modulaire overgangsstuk bij een onderste deel verbindingsmiddelen omvat geschikt om op gebruikelijke wijze te worden aangebracht op het basis element van de fundering2. Foundation as claimed in claim 1, characterized in that the modular transition piece comprises connecting means at a lower part suitable for being arranged in the usual way on the basic element of the foundation 3. Fundering volgens conclusie 2, met het kenmerk, dat het basis element van de fundering een bovenste deel omvat dat een gefixeerde diameter heeft en een conische structuur, welk bovenste deel geschikt is om een verbinding te vormen met het onderste deel van het modulaire overgangsstuk.3. Foundation according to claim 2, characterized in that the basic element of the foundation comprises an upper part that has a fixed diameter and a conical structure, which upper part is suitable for forming a connection with the lower part of the modular transition piece . 4. Fundering volgens conclusie 2 of 3, met het kenmerk, dat de verbindingsmiddelen van het onderste deel van het modulaire overgangsstuk een conische of cilindrische ring omvatten.Foundation according to claim 2 or 3, characterized in that the connecting means of the lower part of the modular transition piece comprise a conical or cylindrical ring. 5. Fundering volgens conclusie 3 of 4, met het kenmerk, dat het 30 modulaire overgangsstuk tussen het boven en onderste deel een hoofdsectie bezit met een aantal ongeveer vertikaal opgestelde buisvormige elementen, onderling verbonden door beugel elementen, waarbij de hoofdsectie uit één of meer modules bestaat, die elk een aantal buisvormige en beugel elementen omvatten. 55. Foundation as claimed in claim 3 or 4, characterized in that the modular transition piece has a main section between the upper and lower part with a number of approximately vertically arranged tubular elements, mutually connected by bracket elements, the main section comprising one or more modules which each comprise a number of tubular and bracket elements. 5 6. Fundering volgens conclusie 5, met het kenmerk, dat de hoofdsectie gestandaardiseerde afmetingen bezit en drie of vier buisvormige elementen omvat met een symmetrische structuur.Foundation according to claim 5, characterized in that the main section has standardized dimensions and comprises three or four tubular elements with a symmetrical structure. 7. Fundering volgens conclusie 5 of 6, met het kenmerk, dat de hoofddelen van de buisvormige elementen van de hoofdsectie onderling evenwijdig lopen en bij het boven en onderste deel onderling convergeren.Foundation according to claim 5 or 6, characterized in that the main parts of the tubular elements of the main section are mutually parallel and converge at the upper and lower parts. 8. Fundering volgens conclusie 1, met het kenmerk, dat het modulaire 15 overgangsstuk voorzien is van geleidingsmiddelen voor het leiden van kabels van de windmolen op zee.8. Foundation according to claim 1, characterized in that the modular transition piece is provided with guide means for guiding cables of the offshore windmill. 9. Fundering volgens conclusies 5 en 8, met het kenmerk, dat in de hoofdsectie van het modulaire overgangsstuk de geleidingsmiddelen deel 20 uitmaken van tenminste één van de buisvormige elementen.9. Foundation according to claims 5 and 8, characterized in that in the main section of the modular transition piece the guide means form part of at least one of the tubular elements. 10. Fundering volgens conclusie 1, met het kenmerk, dat het boven deel van het modulaire overgangsstuk een behuizing bezit voor windmolen apparatuur. 2510. Foundation according to claim 1, characterized in that the upper part of the modular transition piece has a housing for windmill equipment. 25 11. Fundering volgens conclusie 10, met het kenmerk, dat het modulaire overgangsstuk een toegangsplatform omvat, gelegen in de nabijheid van de behuizing.11. Foundation according to claim 10, characterized in that the modular transition piece comprises an access platform located in the vicinity of the housing. 12. Fundering volgens conclusie 10, met het kenmerk, dat de behuizing nabij het boven einde een cilindrische vorm heeft met een diameter aangepast om te worden verbonden met de toren van de windmolen.12. Foundation as claimed in claim 10, characterized in that the housing has a cylindrical shape near the upper end with a diameter adapted to be connected to the tower of the windmill. 13. Fundering volgens één der voorgaande conclusies, met het kenmerk, dat het modulaire overgangsstuk koppelmiddelen omvat om boten aan te meren.A foundation according to any one of the preceding claims, characterized in that the modular transition piece comprises coupling means for mooring boats. 14. Fundering volgens één der voorgaande conclusies, met het kenmerk 10 dat de fundatie een paal fundering is met een basispaal, die het modulaire overgangsstuk draagt.14. Foundation as claimed in any of the foregoing claims, characterized in that the foundation is a pile foundation with a base pile, which supports the modular transition piece. 15. Windmolen system op zee, voorzien van een fundering volgens één der voorgaande conclusies, met een basis element, en een toren die de windmolen 15 draagt, welke fundering verbonden is met de toren van de windmolen en welke fundering over een deel van de lengte ter plaatse van het overgangsstuk een hydrodynamisch open structuur heeft, die gepositioneerd is ter hoogte van het water oppervlak, met het kenmerk, dat 20. de open structuur van het overgangsstuk gevormd is door een vakwerk structuur, - het overgangsstuk een modulair deel is van de mono-paal fundering en het basis element en de toren onderling verbindt, en - de lengte van het modulaire overgangsstuk bepaald wordt door de lengte 25 van het basis element van de fundering tot de zeebodem in relatie tot de diepte van het lokale water oppervlak.A offshore windmill system, provided with a foundation according to any one of the preceding claims, with a basic element, and a tower carrying the windmill, which foundation is connected to the tower of the windmill and which foundation over a part of the length has a hydrodynamically open structure at the location of the transition piece, which is positioned at the level of the water surface, characterized in that the open structure of the transition piece is formed by a lattice structure, - the transition piece is a modular part of the mono-pile foundation and interconnect the base element and the tower, and the length of the modular transition piece is determined by the length of the base element from the foundation to the seabed in relation to the depth of the local water surface.
NL2003648A 2009-10-15 2009-10-15 Foundation for an offshore windmill as well as offshore windmill system, having such a foundation. NL2003648C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2003648A NL2003648C2 (en) 2009-10-15 2009-10-15 Foundation for an offshore windmill as well as offshore windmill system, having such a foundation.

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Application Number Priority Date Filing Date Title
NL2003648 2009-10-15
NL2003648A NL2003648C2 (en) 2009-10-15 2009-10-15 Foundation for an offshore windmill as well as offshore windmill system, having such a foundation.

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NL2003648C2 true NL2003648C2 (en) 2011-04-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3255210A3 (en) * 2016-06-07 2018-02-21 KCI the engineers B.V. Method for installing an offshore structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1134410A1 (en) * 2000-03-17 2001-09-19 Tacke Windenergie GmbH Offshore wind turbine
DE10117113A1 (en) * 2001-04-06 2002-10-10 Joachim Falkenhagen Offshore wind power system bearer structure has position of transition between upper part with static interacting elongated elements and mono-pile lower part dependent on sea-bed height
DE10254100A1 (en) * 2002-11-20 2004-06-09 Joachim Falkenhagen Supporting structure for offshore buildings, e.g. wind power station, consists of tower that is narrowed to main support in area of greatest wave force and uses vertical bars for better transmission of forces
GB2425153A (en) * 2005-04-13 2006-10-18 Leon J Robinson Wind turbine(s) mounted on a lattice tower
GB2427890A (en) * 2005-06-30 2007-01-10 Engineering Business Ltd Mounting of an offshore structure on an offshore support base
WO2009080035A2 (en) * 2007-12-21 2009-07-02 Vestas Wind Systems A/S Method for installing an offshore wind turbine and a barge system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1134410A1 (en) * 2000-03-17 2001-09-19 Tacke Windenergie GmbH Offshore wind turbine
DE10117113A1 (en) * 2001-04-06 2002-10-10 Joachim Falkenhagen Offshore wind power system bearer structure has position of transition between upper part with static interacting elongated elements and mono-pile lower part dependent on sea-bed height
DE10254100A1 (en) * 2002-11-20 2004-06-09 Joachim Falkenhagen Supporting structure for offshore buildings, e.g. wind power station, consists of tower that is narrowed to main support in area of greatest wave force and uses vertical bars for better transmission of forces
GB2425153A (en) * 2005-04-13 2006-10-18 Leon J Robinson Wind turbine(s) mounted on a lattice tower
GB2427890A (en) * 2005-06-30 2007-01-10 Engineering Business Ltd Mounting of an offshore structure on an offshore support base
WO2009080035A2 (en) * 2007-12-21 2009-07-02 Vestas Wind Systems A/S Method for installing an offshore wind turbine and a barge system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3255210A3 (en) * 2016-06-07 2018-02-21 KCI the engineers B.V. Method for installing an offshore structure

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