EP2089591A1 - Hollow profiled element, particularly for a lattice tower; method for the production of such a hollow profiled element; lattice tower comprising at least three corner posts - Google Patents

Hollow profiled element, particularly for a lattice tower; method for the production of such a hollow profiled element; lattice tower comprising at least three corner posts

Info

Publication number
EP2089591A1
EP2089591A1 EP07846582A EP07846582A EP2089591A1 EP 2089591 A1 EP2089591 A1 EP 2089591A1 EP 07846582 A EP07846582 A EP 07846582A EP 07846582 A EP07846582 A EP 07846582A EP 2089591 A1 EP2089591 A1 EP 2089591A1
Authority
EP
European Patent Office
Prior art keywords
profile
profile part
legs
hollow
hollow profile
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07846582A
Other languages
German (de)
French (fr)
Inventor
Hermann Oehme
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2089591A1 publication Critical patent/EP2089591A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
    • E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • E04H12/08—Structures made of specified materials of metal
    • E04H12/10—Truss-like structures
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
    • E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
    • E04C2003/0439—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the cross-section comprising open parts and hollow parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
    • E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
    • E04C2003/0447—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section circular- or oval-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0486—Truss like structures composed of separate truss elements
    • 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
    • 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
    • Y02E10/728—Onshore wind turbines
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49623—Static structure, e.g., a building component
    • Y10T29/49625—Openwork, e.g., a truss, joist, frame, lattice-type or box beam
    • Y10T29/49627—Frame component

Definitions

  • the present invention relates to a hollow profile, in particular for a truss tower with the features of the preamble of claim 1, a method for producing a hollow profile and a truss tower with at least three corner posts.
  • Truss towers usually have three to four corner handles, which are connected by cross braces (diagonals) are, with the corner handles and the struts are made of an L-profile.
  • L-profiles are only produced up to a certain leg length as standard.
  • the largest commercially available L-profiles have a maximum leg length of 260 mm. Due to the given limb length and the open profile, the buckling length or bending and torsion
  • a truss tower to compensate for the low buckling length or bending and torsional stiffness of the standard L-profiles must contain a lot of struts in short distances between the corner stems to have a sufficiently high load capacity for the loads occurring a wind turbine can (sub framework).
  • the struts are connected to each other via screw connections.
  • a truss tower where L-sections are used requires a lot of bracing (8000- 10,000). Accordingly, high installation costs arise during tower assembly.
  • Another disadvantage is that the fittings must be properly maintained after assembly to timely release a loosening screw.
  • the tower of a wind energy plant is also subject to considerable dynamic load due to the nacelle arranged on the tower.
  • torsion loads predominantly occur in the upper area, so that the tower is designed in the upper area substantially with respect to torsion. Torsion only plays a minor role in the lower tower area, but the loads caused by bending moments increase dramatically.
  • the lower tower base is made very large when using L-profiles for the corner handles, as this compensates for the loads occurring can be.
  • the base area In a truss tower with L-profiles with a height of over 100 m, the base area z. B. 23x 23 m.
  • Hollow sections are known from EP 1 442 807 A1 and FR 921 439 A1, which consist of a first and a second profile part, wherein the first profile part is a standard L-profile.
  • the second profile part is formed as a web and arranged in such a way in the first profile part, that forms a Hohlprof ⁇ l, wherein the one longitudinal edge of the web is welded to a leg and the other longitudinal edge of the web is welded to the other leg.
  • hollow profiles for the corner handles of a lifting device consist of two parts with an angular cross-section of different Dimensions exist, with the outer ends of the legs of the smaller rest against the legs of the larger. The two parts of the hollow profile are thus not firmly connected.
  • Such a hollow profile is not suitable as a corner handle for a wind turbine, since it could in no way absorb the forces occurring during operation of a wind energy plant.
  • Object of the present invention is therefore to provide a hollow profile that can be used as a corner handle in a truss tower and is designed so that the truss tower, compared to the known from the prior art truss towers a significantly reduced number of struts and a significantly reduced lower tower base having.
  • the object is achieved with a hollow profile, which has the characterizing features of claim 1, a method for producing a hollow profile according to claim 12 and a truss tower according to claim 14.
  • the hollow profile according to claim 1 has a first profile part and a second profile part, wherein the cross section of the hollow profile is formed so that the first profile part has two legs and the second profile part is arranged between the legs of the first profile part such that to form a closed profile Hollow cross-section, which is connected to an end edge of the second profile part with a leg and the other end edge of the second profile part with the other leg of the first profile part in such a way that a portion of the respective leg of the first profile part protrudes beyond the connection point.
  • the first and second profile part are designed in such a way that the ratio of the two area moments of inertia about the area center of gravity of the cross section of the hollow profile is between 0.9 and 1.6.
  • the area moment of inertia together with the modulus of elasticity is a measure of the stiffness of a flat cross-section against bending or against torsion.
  • the area moment of inertia provides information about the tendency of bars to buckle.
  • the ratio of the two area moments of inertia about the centroid axis is at a pipe profile 1. It is known that pipe profiles over other hollow sections have the better static properties. A pipe profile has z. As a higher torsional stiffness and a more favorable stability behavior, in particular a lower tendency to bending torsional buckling. This is due, inter alia, to the fact that the cross section is designed such that occurring forces and moments can be absorbed equally well in all areas of the cross section.
  • tubular profiles do not have suitable possibilities for connecting several profiles in a simple manner or stiffening them through diagonals, since they have no straight surfaces for joining purposes.
  • the advantage of a tubular profile is advantageously taken over in such a way that with respect to the ratio of the area moments of inertia, the value should be around 1.
  • the hollow profile according to the invention has the advantage over the known tube profile that it also has straight surfaces for joining purposes.
  • a further advantage is that the hollow profile according to the invention consists of two profile parts, whereby the variability in terms of the design of the cross section compared to standard profiles is significantly improved.
  • the Applicant has recognized that the use of a hollow profile with a ratio of the moments of inertia of the invention enables the formation of a nestschwerkturmes allows that can absorb the occurring during operation of a wind turbine in the truss tower loads, the tower still slim (relatively small lower tower base) and a significantly reduced number of braces compared to the known from the prior art towers with standard L-profile ,
  • the legs of the first profile part are arranged at an angle between 60 ° and 120 °.
  • the size of the angle between the legs of the first profile part can be selected depending on the number of corner handles of the truss tower. So it is advantageous in a 3-siteligen mast when the angle is 60 °. In contrast, in the case of a 4-post mast, it is advantageous to form the first profile part at an angle of 90 °.
  • a further advantageous embodiment of the invention provides that the legs of the first profile part are connected to each other via a circular section.
  • the circular sections of the first profile parts form the outer edges of the truss tower.
  • the round shape of the edges due to the circular sections offers the advantage that the sharp edges and thus the noise level can be reduced.
  • the ratio of the thickness of the legs to the radius of the circular profile of the first profile part is section 1: 3.
  • the maintenance of the ratio according to the invention offers in particular in the production of the first profile part by bending the advantage that occurring during the bending process metallurgical stresses can be reduced.
  • the second profile part also has two legs, which are arranged at an angle between 60 ° and 120 ° to each other.
  • the legs of the second profile part are connected to each other via a circular section, wherein the ratio of the thickness of the legs to the radius of the circular section is 1: 3.
  • a further advantageous embodiment provides that the end edges of the legs of the second profile part are bent at an angle between 110 ° and 160 ° to the outside.
  • the present invention further relates to a method for producing a hollow profile according to one of the preceding claims.
  • the first profile part is made of a flat steel, which is bent in such a way that the first profile part has a circular section with two legs extending from the circular section.
  • the second profile part is made of a flat steel which is bent such that the second profile part has a circular portion and two legs extending from the circular portion. Subsequently, the outer ends of the legs of the second profile part are bent at an angle between 110 ° and 160 ° to the outside.
  • an outwardly facing chamfer provided at an angle between 70 ° and 90 ° respectively at the leg end edges of the second profile part.
  • the second profile part is arranged in the first profile part such that the tips of the chamfers touch the inner edges of the legs of the first profile part at the leg end edges of the second profile part, and the two profile parts welded together.
  • An inventive embodiment of the method provides that in addition the outer ends of the legs of the first profile part are bent outward. This offers the advantage of occurring during subsequent welding of the two profile parts occurring thermal deformations of the legs can be compensated.
  • the present invention further relates to a truss tower for a wind energy plant with at least three corner posts, which are formed as a hollow profile. Erf ⁇ ndungsloom the hollow profile according to one of claims 1- 12 is formed.
  • the corner stems are designed such that the ratio of the two area moments of inertia (Iy, Iz) about the centroids (y, z) of the cross section of the hollow section (10) over the length of the tower is different.
  • Figure 1 schematically an inventive hollow profile.
  • Figure 2 shows schematically three hollow profile according to the invention in which the first and second profile part is designed such that the ratio of the two area moments of inertia about the center of gravity points of the cross section of the hollow profile 1, 1.35 and 1.6.
  • FIG. 1 shows schematically a hollow profile 10 according to the invention, which consists of a first profile part 11 and a second profile part 12.
  • the first profile part 11 has a circular section 13. From the ends of the circular section legs 14, 15 extend.
  • the second profile part 12 also has a circular section 16, from which legs 17, 18 extend.
  • the upper ends of the legs 17, 18 are bent at an angle ⁇ .
  • a chamfer 19, 20 is provided in each case.
  • FIG. 2 schematically shows three hollow profiles according to the invention, each having a different ratio of the area moments of inertia Iy / Iz.
  • the area moments of inertia are related to the centroid axes y and z, wherein both axes are perpendicular to each other on the centroid S of the respective hollow profile.
  • the different ratios Iy / Iz of the three hollow profiles of Figure 2 arise due to the different profile thicknesses of the first and second profile part.
  • the profile thickness of the first profile part of the upper hollow profile is very thick in relation to the Proflldicke of the second Profllteils.
  • Such a hollow profile has an Iy / Iz of ⁇ 1, for example.
  • Such a ratio corresponds to that of a round tube.
  • the profile thickness of the first profile part is much thinner than in the second profile part.

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

Abstract

Disclosed is a hollow profiled element, particularly for a lattice tower, comprising a first profiled part and a second profiled part. The cross-section of the hollow profiled element is designed such that the first profiled part has two legs and the second profiled part is disposed between the legs of the first profiled part in such a way that one final edge of the second profiled part is connected to one leg of the first profiled part while the other final edge of the second profiled part is connected to the other leg of the first profiled part in order to form a closed hollow cross-section, said connections being such that a partial section of the respective leg of the first profiled part projects from the joint. The first and the second profiled part are designed such that the ratio between the two area moments of inertia about the centroid axes of the cross-section of the hollow profiled element ranges between 0.9 and 1.6.

Description

Hoh^ofil, insbesondere für einen Fachwerkturm Hoh ^ ofil, especially for a truss tower
Verfahren zur Herstellung eines HohlprofilsMethod for producing a hollow profile
Fachwerkturm mit mindestens drei EckstielenTruss tower with at least three corner stems
Die vorliegende Erfindung betrifft ein Hohlprofil, insbesondere für einen Fachwerkturm mit den Merkmalen des Oberbegriffs des Anspruchs 1, ein Verfahren zur Herstellung eines Hohlprofils sowie einen Fachwerkturm mit mindestens drei Eckstielen.The present invention relates to a hollow profile, in particular for a truss tower with the features of the preamble of claim 1, a method for producing a hollow profile and a truss tower with at least three corner posts.
Die Entwicklung von Windenergieanlagen geht dahin, dass deren Abmessungen immer größer werden. Dies hat zur Folge, dass auch der die Gondel und den Rotor tragende Turm sehr groß dimensioniert werden muss. Bislang wurden die Türme von Windenergieanlagen aus Stahlrohren oder auch Spannbeton hergestellt. Diese weisen aber Nachteile auf. Zum einen sind die Abmessungen der Türme so groß geworden, dass sie nur unter großen Komplikationen transportierbar sind. Zum anderen sind solche Turmtypen aufgrund des hohen Materialeinsatzes sehr teuer.The development of wind turbines goes so that their dimensions are getting bigger. This has the consequence that also the tower carrying the nacelle and the rotor must be dimensioned very large. So far, the towers of wind turbines were made of steel pipes or prestressed concrete. However, these have disadvantages. On the one hand, the dimensions of the towers have become so great that they can only be transported with great complications. On the other hand, such tower types are very expensive due to the high material usage.
Aufgrund dessen werden nunmehr auch Windenergieanlagen hergestellt, die einen Fachwerkturm aufweisen. Fachwerktürme weisen in der Regel drei bis vier Eckstiele auf, die durch Querverstrebungen (Diagonalen) miteinander verbunden sind, wobei die Eckstiele und die Verstrebungen aus einem L-Profil hergestellt sind.Due to this, now also wind turbines are being made, which have a truss tower. Truss towers usually have three to four corner handles, which are connected by cross braces (diagonals) are, with the corner handles and the struts are made of an L-profile.
Von Nachteil ist, dass L-Profile nur bis zu einer bestimmten Schenkellänge serienmäßig hergestellt werden. Die größten handelsüblichen L-Profile weisen maximal eine Schenkellänge von 260 mm auf. Aufgrund der vorgegebenen Schen- kellänge und des offenen Profils ist auch die Knicklänge bzw. Biege- und Torsi-The disadvantage is that L-profiles are only produced up to a certain leg length as standard. The largest commercially available L-profiles have a maximum leg length of 260 mm. Due to the given limb length and the open profile, the buckling length or bending and torsion
\ v onssteifigkeit von L-Profilen begrenzt.limited stiffness of L-profiles.
Damit ergibt sich das Problem, dass ein Fachwerkturm zur Kompensation der geringen Knicklänge bzw. Biege- und Torsionssteifigkeit der Standard L-Profile sehr viele Verstrebungen in kurzen Abständen zwischen den Eckstielen enthalten muss, um eine genügend hohe Tragfähigkeit für die auftretenden Lasten einer Windenergieanlage aufweisen zu können (Unterfachwerk). Die Verstrebungen werden über Schraubverbindungen miteinander verbunden. Ein Fachwerkturm bei dem L-Profil verwendet werden, sind sehr viele Verstrebungen notwendig (8000- 10.000). Entsprechend entstehen bei der Turmmontage hohe Montagekosten. Ein weiterer Nachteil ist, dass die Verschraubungen nach der Montage entsprechend gewartet werden müssen, um ein Lösen von Schraubverbindungen rechtzeitig zu erkennen.This results in the problem that a truss tower to compensate for the low buckling length or bending and torsional stiffness of the standard L-profiles must contain a lot of struts in short distances between the corner stems to have a sufficiently high load capacity for the loads occurring a wind turbine can (sub framework). The struts are connected to each other via screw connections. A truss tower where L-sections are used requires a lot of bracing (8000- 10,000). Accordingly, high installation costs arise during tower assembly. Another disadvantage is that the fittings must be properly maintained after assembly to timely release a loosening screw.
Im Gegensatz zu Leitungsmasten wird der Turm einer Windenergieanlage aufgrund der auf dem Turm angeordneten Maschinengondel auch erheblich dynamisch belastet. Bei dem Fachwerkturm einer Windenergieanlage treten im oberen Bereich überwiegend Torsionslasten auf, so dass der Turmes im oberen Bereich im wesentlichen hinsichtlich Torsion ausgelegt wird. Im unteren Turmbereich spielt Torsion nur noch eine geringe Rolle, dafür nehmen aber die Belastungen durch Biegemomente extrem zu. Um Biegelasten Rechnung zu tragen, wird die untere Turmgrundfläche bei der Verwendung von L-Profilen für die Eckstiele sehr groß ausgebildet, da auf diese Weise die auftretenden Lasten kompensiert werden können. Bei einem Fachwerkturm mit L-Profilen mit einer Höhe von über 100 m beträgt die Grundfläche z. B. 23x 23 m.In contrast to pylons, the tower of a wind energy plant is also subject to considerable dynamic load due to the nacelle arranged on the tower. In the truss tower of a wind turbine, torsion loads predominantly occur in the upper area, so that the tower is designed in the upper area substantially with respect to torsion. Torsion only plays a minor role in the lower tower area, but the loads caused by bending moments increase dramatically. In order to take account of bending loads, the lower tower base is made very large when using L-profiles for the corner handles, as this compensates for the loads occurring can be. In a truss tower with L-profiles with a height of over 100 m, the base area z. B. 23x 23 m.
Insbesondere bei der Herstellung von Fachwerktürmen für eine Windenergieanlage wäre daher die Verwendung von Hohlprofilen sinnvoll, da diese gegenüber Standard-L-Profilen statische Vorteile aufweisen. Übliche Hohlprofile wie z. B. stranggepresste Rundrohr- und Quadratprofile weisen aber den Nachteil auf, dass sie aus konstruktiven Gründen nur mit hohem Aufwand zusammengefügt werden können.In particular, in the manufacture of truss towers for a wind turbine, therefore, the use of hollow sections would be useful because they have static advantages over standard L-profiles. Usual hollow sections such. B. extruded round tube and square profiles have the disadvantage that they can be assembled for design reasons only with great effort.
Aus der EP 1 442 807 Al sowie der FR 921 439 Al sind Hohlprofile bekannt, die aus einem ersten und einem zweiten Profilteil bestehen, wobei das erste Profilteil ein Standard-L-Profil ist. Das zweite Profilteil ist als Steg ausgebildet und dergestalt im ersten Profilteil angeordnet, dass sich ein Hohlprofϊl ausbildet, wobei der eine Längsrand des Steges mit einem Schenkel verschweißt ist und der andere Längsrand des Steges mit dem anderen Schenkel verschweißt ist.Hollow sections are known from EP 1 442 807 A1 and FR 921 439 A1, which consist of a first and a second profile part, wherein the first profile part is a standard L-profile. The second profile part is formed as a web and arranged in such a way in the first profile part, that forms a Hohlprofϊl, wherein the one longitudinal edge of the web is welded to a leg and the other longitudinal edge of the web is welded to the other leg.
Selbstverständlich sind die statischen Voraussetzungen bei der Verwendung eines solchen bekannten Hohlprofils als Eckstiel für einen Fachwerkturm deutlich besser als es bei der Verwendung eines Standard-L-Profils der Fall ist. Trotzdem reichen die zur Verfügung stehenden Abmessungen der für die Herstellung des bekannten Hohlprofils benötigten Standard-L-Profile häufig nicht aus, um einen Fachwerkturm für eine Windenergieanlage herstellen zu können, ohne dass die Anzahl der Verstrebungen extrem hoch und der Mast damit entsprechend teuer ist. Oder aber es müssen für die Erzeugung des Hohlprofils Spezialmaschinen verwendet werden, deren Herstellungskosten enorm hoch sind, so dass auf diese Weise die Kosten für das Hohlprofil sehr hoch werden.Of course, the static conditions when using such a known hollow profile as a corner handle for a truss tower significantly better than is the case with the use of a standard L-profile. Nevertheless, the available dimensions of the required for the production of the known hollow profile standard L-profiles are often not sufficient to produce a truss tower for a wind turbine without the number of struts extremely high and the mast is therefore expensive. Or else it must be used for the production of the hollow profile special machines whose production costs are enormously high, so that in this way the cost of the hollow section are very high.
Aus der EP 1015374 sind Hohlprofile für die Eckstiele einer Hebevorrichtung bekannt, die aus zwei Teilen mit einem winkligen Querschnitt unterschiedlicher Abmessungen bestehen, wobei die äußeren Enden der Schenkel des Kleineren an den Schenkeln des Größeren anliegen. Die beiden Teile des Hohlprofils sind somit nicht fest miteinander verbunden. Ein solches Hohlprofil ist als Eckstiel für eine Windenergieanlage nicht geeignet, da es in keiner Weise die beim Betrieb einer Windenergieanlage auftretenden Kräfte aufnehmen könnte.From EP 1015374 hollow profiles for the corner handles of a lifting device are known which consist of two parts with an angular cross-section of different Dimensions exist, with the outer ends of the legs of the smaller rest against the legs of the larger. The two parts of the hollow profile are thus not firmly connected. Such a hollow profile is not suitable as a corner handle for a wind turbine, since it could in no way absorb the forces occurring during operation of a wind energy plant.
Aufgabe der vorliegenden Erfindung ist daher die Bereitstellung eines Hohlprofils, das als Eckstiel in einem Fachwerkturm eingesetzt werden kann und so ausgebildet ist, dass der Fachwerkturm, gegenüber dem aus den Stand der Technik bekannten Fachwerktürmen eine deutlich reduzierte Anzahl an Verstrebungen sowie eine deutlich reduzierte untere Turmgrundfläche aufweist.Object of the present invention is therefore to provide a hollow profile that can be used as a corner handle in a truss tower and is designed so that the truss tower, compared to the known from the prior art truss towers a significantly reduced number of struts and a significantly reduced lower tower base having.
Gelöst wird die Aufgabe mit einem Hohlprofϊl, das die kennzeichnenden Merkmale des Anspruchs 1 aufweist, einem Verfahren zur Herstellung eines Hohlprofils gemäß Anspruch 12 und einem Fachwerkturm gemäß Anspruch 14.The object is achieved with a hollow profile, which has the characterizing features of claim 1, a method for producing a hollow profile according to claim 12 and a truss tower according to claim 14.
Das Hohlprofil gemäß Anspruch 1 weist ein erstes Profilteil und ein zweites Profilteil auf, wobei der Querschnitt des Hohlprofils so ausgebildet ist, dass das erste Profilteil zwei Schenkel aufweist und das zweite Profilteil dergestalt zwischen den Schenkeln des ersten Profilteils angeordnet ist, dass zur Bildung eines geschlossenen Hohlquerschnittes, die eine Endkante des zweiten Profilteils mit einem Schenkel und die andere Endkante des zweiten Profilteils mit dem anderen Schenkel des ersten Profilteils verbunden ist und zwar so, dass ein Teilabschnitt des jeweiligen Schenkels des ersten Profilteils über die Verbindungsstelle hinausragt.The hollow profile according to claim 1 has a first profile part and a second profile part, wherein the cross section of the hollow profile is formed so that the first profile part has two legs and the second profile part is arranged between the legs of the first profile part such that to form a closed profile Hollow cross-section, which is connected to an end edge of the second profile part with a leg and the other end edge of the second profile part with the other leg of the first profile part in such a way that a portion of the respective leg of the first profile part protrudes beyond the connection point.
Erfindungsgemäß sind das erste und zweite Profilteil dergestalt ausgebildet, dass das Verhältnis der beiden Flächenträgheitsmomente um die Flächenschwer- punktsachen des Querschnitts des Hohlprofils zwischen 0,9 und 1,6 liegt. Das Flächenträgheitsmoment ist zusammen mit dem Elastizitätsmodul ein Maß für die Steifigkeit eines ebenen Querschnitts gegen Biegung bzw. gegen Torsion. Zudem liefert das Flächenträgheitsmoment Aufschluss über die Neigung von Stäben zu knicken.According to the invention, the first and second profile part are designed in such a way that the ratio of the two area moments of inertia about the area center of gravity of the cross section of the hollow profile is between 0.9 and 1.6. The area moment of inertia together with the modulus of elasticity is a measure of the stiffness of a flat cross-section against bending or against torsion. In addition, the area moment of inertia provides information about the tendency of bars to buckle.
Das Verhältnis der beiden Flächenträgheitsmomente um die Flächenschwerpunktsachsen beträgt bei einem Rohrprofil 1. Es ist bekannt, dass Rohrprofile gegenüber anderen Hohlprofilen die besseren statischen Eigenschaften haben. Ein Rohrprofil weist z. B. eine höhere Torsionssteifigkeit sowie ein günstigeres Stabilitätsverhalten, insbesondere eine geringere Neigung zum Biegedrillknicken auf. Dies liegt unter anderem darin begründet, dass der Querschnitt so ausgebildet ist, dass auftretende Kräfte und Momente in allen Bereichen des Querschnitts gleich gut aufgenommen werden können.The ratio of the two area moments of inertia about the centroid axis is at a pipe profile 1. It is known that pipe profiles over other hollow sections have the better static properties. A pipe profile has z. As a higher torsional stiffness and a more favorable stability behavior, in particular a lower tendency to bending torsional buckling. This is due, inter alia, to the fact that the cross section is designed such that occurring forces and moments can be absorbed equally well in all areas of the cross section.
Der Nachteil bei der Verwendung von Rohrprofilen ist, dass sie keine geeigneten Möglichkeiten aufweisen, um mehrere Profile in einfacher Weise miteinander zu verbinden bzw. sie durch Diagonalen auszusteifen, da sie keine geraden Flächen zu Verbindungszwecken aufweisen.The disadvantage with the use of tubular profiles is that they do not have suitable possibilities for connecting several profiles in a simple manner or stiffening them through diagonals, since they have no straight surfaces for joining purposes.
Bei der vorliegenden Erfindung wird in vorteilhafter Weise der Vorzug eines Rohrprofils dergestalt übernommen, dass im Hinblick auf das Verhältnis der Flächenträgheitsmomente der Wert um 1 liegen soll. Das erfindungsgemäße Hohlprofil weist aber gegenüber dem bekannten Rohrprofil den Vorteil auf, dass es zudem gerade Flächen zu Verbindungszwecken aufweist. Weiterhin ist von Vorteil, dass das erfindungsgemäße Hohlprofil aus zwei Profilteilen besteht, wodurch die Variabilität im Hinblick auf die Gestaltung des Querschnitts im Vergleich zu Standardprofilen erheblich verbessert wird.In the present invention, the advantage of a tubular profile is advantageously taken over in such a way that with respect to the ratio of the area moments of inertia, the value should be around 1. However, the hollow profile according to the invention has the advantage over the known tube profile that it also has straight surfaces for joining purposes. A further advantage is that the hollow profile according to the invention consists of two profile parts, whereby the variability in terms of the design of the cross section compared to standard profiles is significantly improved.
Der Anmelder hat erkannt, dass die Verwendung eines Hohlprofils mit einem erfindungsgemäßen Verhältnis der Flächenträgheitsmomente die Ausbildung ei- nes Fachwerkturmes ermöglicht, der die beim Betrieb einer Windenergieanlage im Fachwerkturm auftretende Belastungen aufnehmen kann, wobei der Turm dennoch schlank (relativ kleine untere Turmgrundfläche) und eine deutlich reduzierte Anzahl an Verstrebungen gegenüber den aus dem Stand der Technik bekannten Türmen mit Standard-L-Profil.The Applicant has recognized that the use of a hollow profile with a ratio of the moments of inertia of the invention enables the formation of a nes Fachwerkturmes allows that can absorb the occurring during operation of a wind turbine in the truss tower loads, the tower still slim (relatively small lower tower base) and a significantly reduced number of braces compared to the known from the prior art towers with standard L-profile ,
Gemäß vorteilhafter Ausgestaltungen der Erfindung sind die Schenkel des ersten Profilteils in einem Winkel zwischen 60° und 120° angeordnet. Die Größe des Winkels zwischen den Schenkeln des ersten Profilteils kann in Abhängigkeit von der Zahl der Eckstiele des Fachwerkturms gewählt werden. So ist es bei einem 3- stieligen Mast vorteilhaft, wenn der Winkel 60° beträgt. Bei einem 4-stieligen Mast ist es demgegenüber aber vorteilhaft, das erste Profilteil mit einem Winkel von 90° auszubilden.According to advantageous embodiments of the invention, the legs of the first profile part are arranged at an angle between 60 ° and 120 °. The size of the angle between the legs of the first profile part can be selected depending on the number of corner handles of the truss tower. So it is advantageous in a 3- stieligen mast when the angle is 60 °. In contrast, in the case of a 4-post mast, it is advantageous to form the first profile part at an angle of 90 °.
Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die Schenkel des ersten Profilteils über einen Kreisabschnitt miteinander verbunden sind.A further advantageous embodiment of the invention provides that the legs of the first profile part are connected to each other via a circular section.
Das Vorsehen eines Kreisabschnitt im ersten Profϊlteil bietet den Vorteil, dass auf diese Weise die Querschnittsform des Rundrohres zum Teil nachgebildet werden kann, wodurch entsprechend auch die positiven statischen Eigenschaften des Rohrquerschnitts in das erfindungsgemäße Hohlprofil übernommen werden.The provision of a circular section in the first profiled part offers the advantage that in this way the cross-sectional shape of the round tube can be partially reproduced, whereby the positive static properties of the tube cross-section are correspondingly also taken over into the hollow profile according to the invention.
Bei der Anwendung des erfindungsgemäßen Hohlprofils als Eckstiel eines Fachwerkturmes bilden die Kreisabschnitte der ersten Profilteile die äußere Kanten des Fachwerkturmes. Die aufgrund der Kreisabschnitte runde Ausbildung der Kanten bietet den Vorteil, dass gegenüber scharfen Kanten der Windwiderstand und damit auch die Geräuschentwicklung reduziert werden kann.When using the hollow profile according to the invention as a corner handle of a truss tower, the circular sections of the first profile parts form the outer edges of the truss tower. The round shape of the edges due to the circular sections offers the advantage that the sharp edges and thus the noise level can be reduced.
Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung beträgt beim ersten Profilteil das Verhältnis der Dicke der Schenkel zu dem Radius des Kreis- abschnitts 1: 3. Das Einhalten des erfindungsgemäßen Verhältnis bietet insbesondere bei der Herstellung des ersten Profilteil durch Biegen den Vorteil, dass beim Biegevorgang auftretende metallurgische Spannungen reduziert werden können.According to a further advantageous embodiment of the invention, the ratio of the thickness of the legs to the radius of the circular profile of the first profile part is section 1: 3. The maintenance of the ratio according to the invention offers in particular in the production of the first profile part by bending the advantage that occurring during the bending process metallurgical stresses can be reduced.
Gemäß weiterer vorteilhafter Ausgestaltungen der Erfindung weist das zweite Profilteil ebenfalls zwei Schenkel auf, die in einem Winkel zwischen 60° und 120° zueinander angeordnet sind. Zudem sind die Schenkel des zweiten Profilteils über einen Kreisabschnitt miteinander verbunden sind, wobei das Verhältnis der Dicke der Schenkel zu dem Radius des Kreisabschnitts 1 : 3 beträgt.According to further advantageous embodiments of the invention, the second profile part also has two legs, which are arranged at an angle between 60 ° and 120 ° to each other. In addition, the legs of the second profile part are connected to each other via a circular section, wherein the ratio of the thickness of the legs to the radius of the circular section is 1: 3.
Eine weitere vorteilhafte Ausgestaltung sieht vor, dass die Endkanten der Schenkel des zweiten Profilteils in einem Winkel zwischen 110° und 160° nach außen gebogen sind.A further advantageous embodiment provides that the end edges of the legs of the second profile part are bent at an angle between 110 ° and 160 ° to the outside.
Die vorliegende Erfindung betrifft weiterhin ein Verfahren zur Herstellung eines Hohlprofils gemäß einem der vorhergehenden Ansprüche. Erfindungsgemäß wird das erste Profilteil aus einem Flachstahl hergestellt, der dergestalt gebogen wird, dass das erste Profilteil einen Kreisabschnitt mit zwei sich von dem Kreisabschnitt erstreckenden Schenkeln aufweist.The present invention further relates to a method for producing a hollow profile according to one of the preceding claims. According to the invention, the first profile part is made of a flat steel, which is bent in such a way that the first profile part has a circular section with two legs extending from the circular section.
Ebenso wird das zweite Profilteil aus einem Flachstahl hergestellt, der dergestalt gebogen wird, dass das zweite Profilteil einen Kreisabschnitt und zwei sich von dem Kreisabschnitt erstreckende Schenkel aufweist. Anschließend werden die äußeren Enden der Schenkel des zweiten Profilteils in einem Winkel zwischen 110° und 160° nach außen gebogen werden. Zudem werden jeweils an den Schenkelendkanten des zweiten Profilteils eine nach außen weisenden Fase, mit einem Winkel zwischen 70° und 90° vorgesehen. Das Biegen der Schenkel nach außen sowie das Vorsehen der Fase bieten den Vorteil, dass die Herstellung der späteren Schweißverbindung zwischen den beiden Profilteilen erleichtert wird und eine Schweißnaht erzeugt werden kann, die den später auftretenden Kräften beim Betrieb der Windenergieanlage standhält.Likewise, the second profile part is made of a flat steel which is bent such that the second profile part has a circular portion and two legs extending from the circular portion. Subsequently, the outer ends of the legs of the second profile part are bent at an angle between 110 ° and 160 ° to the outside. In addition, an outwardly facing chamfer, provided at an angle between 70 ° and 90 ° respectively at the leg end edges of the second profile part. The bending of the legs to the outside and the provision of the chamfer offer the advantage that the production of the subsequent welded joint between the two profile parts is facilitated and a weld can be produced which withstands the later occurring forces during operation of the wind turbine.
Abschließend wird das zweite Profilteil in dem ersten Profilteil dergestalt angeordnet, dass die Spitzen der Fasen an den Schenkelendkanten des zweiten Profilteils die Innenkanten der Schenkel des ersten Profilteils berühren, und die beiden Profilteile miteinander verschweißt.Finally, the second profile part is arranged in the first profile part such that the tips of the chamfers touch the inner edges of the legs of the first profile part at the leg end edges of the second profile part, and the two profile parts welded together.
Eine erfindungsgemäße Ausgestaltung des Verfahrens sieht vor, das zusätzlich die äußeren Enden der Schenkel des ersten Profilteils nach außen gebogen werden. Dies bietet den Vorteil, beim späteren Verschweißen der beiden Profilteile auftretende thermische Verformungen der Schenkel ausgeglichen werden können.An inventive embodiment of the method provides that in addition the outer ends of the legs of the first profile part are bent outward. This offers the advantage of occurring during subsequent welding of the two profile parts occurring thermal deformations of the legs can be compensated.
Die vorliegende Erfindung betrifft weiterhin einen Fachwerkturm für eine Windenergieanlage mit mindestens drei Eckstielen, die als Hohlprofil ausgebildet sind. Erfϊndungsgemäß ist das Hohlprofil gemäß einem der Ansprüche 1- 12 ausgebildet.The present invention further relates to a truss tower for a wind energy plant with at least three corner posts, which are formed as a hollow profile. Erfϊndungsgemäß the hollow profile according to one of claims 1- 12 is formed.
Wie in der Einleitung erläutert, verändert sich die Art der Belastung durch Torsion und Biegemoment über die Turmlänge. Im oberen Turmbereich muss primär Torsion und im unteren Turmbereich Biegemomente berücksichtig werden. Um diesen Anforderungen gerecht zu werden sind, gemäß einer vorteilhaften Ausgestaltung des Fachwerkturms die Eckstiele dergestalt ausgebildet, dass das Verhältnis der beiden Flächenträgheitsmomente (Iy, Iz) um die Flächenschwer- punktsachen (y, z) des Querschnitts des Hohlprofils (10) über die Länge des Turmes unterschiedlich ist.As explained in the introduction, the type of load due to torsion and bending moment changes over the length of the tower. In the upper tower area, torsion must be taken into account and bending moments in the lower tower area. In order to meet these requirements, according to an advantageous embodiment of the truss tower, the corner stems are designed such that the ratio of the two area moments of inertia (Iy, Iz) about the centroids (y, z) of the cross section of the hollow section (10) over the length of the tower is different.
Im folgenden wird die Erfindung anhand der Figuren lund 2 näher erläutert. Es zeigt: Figur 1: schematisch ein erfindungsgemäßes Hohlprofil.In the following the invention will be explained in more detail with reference to the figures lund 2. It shows: Figure 1: schematically an inventive hollow profile.
Figur 2: schematisch drei erfindungsgemäße Hohlprofil bei denen das erste und zweite Profilteil dergestalt ausgebildet ist, dass das Verhältnis der beiden Flächenträgheitsmomente um die Flächenschwer- punktsachen des Querschnitts des Hohlprofils 1, 1,35 und 1,6 beträgt.Figure 2 shows schematically three hollow profile according to the invention in which the first and second profile part is designed such that the ratio of the two area moments of inertia about the center of gravity points of the cross section of the hollow profile 1, 1.35 and 1.6.
Die Figur 1 zeigt schematisch ein erfindungsgemäßes Hohlprofil 10, das aus einem ersten Profilteil 11 und einem zweiten Profilteil 12 besteht. Das erste Profilteil 11 weist einen Kreisabschnitt 13 auf. Von den Enden des Kreisabschnitts erstrecken Schenkel 14, 15.1 shows schematically a hollow profile 10 according to the invention, which consists of a first profile part 11 and a second profile part 12. The first profile part 11 has a circular section 13. From the ends of the circular section legs 14, 15 extend.
Das zweite Profilteil 12 weist ebenfalls einen Kreisabschnitt 16 auf, von dem sich Schenkel 17, 18 erstrecken. Die oberen Enden der Schenkel 17, 18 sind in einem Winkel α gebogen. An den Kanten der oberen Schenkelenden 17, 18 ist jeweils eine Fase 19, 20 vorgesehen.The second profile part 12 also has a circular section 16, from which legs 17, 18 extend. The upper ends of the legs 17, 18 are bent at an angle α. At the edges of the upper leg ends 17, 18 a chamfer 19, 20 is provided in each case.
Die Figur 2 zeigt schematisch drei erfindungsgemäße Hohlprofile, die jeweils ein unterschiedliches Verhältnis der Flächenträgheitsmomente Iy/ Iz aufweisen. Die Flächenträgheitsmomente sind bezogen auf die Flächenschwerpunktsachsen y und z, wobei beide Achsen senkrecht zueinander auf dem Flächenschwerpunkt S des jeweiligen Hohlprofils stehen.FIG. 2 schematically shows three hollow profiles according to the invention, each having a different ratio of the area moments of inertia Iy / Iz. The area moments of inertia are related to the centroid axes y and z, wherein both axes are perpendicular to each other on the centroid S of the respective hollow profile.
Die unterschiedlichen Verhältnisse Iy/Iz der drei Hohlprofile der Figur 2 entstehen aufgrund der unterschiedlichen Profildicken des ersten und zweiten Profilteils. So ist die Profildicke des ersten Profilteils des oberen Hohlprofils sehr dick im Verhältnis zur Proflldicke des zweiten Profllteils. Ein solches Hohlprofll weist zum Beispiel ein Iy/Iz von ~1 auf. Ein solches Verhältnis entspricht dem eines Rundrohres.The different ratios Iy / Iz of the three hollow profiles of Figure 2 arise due to the different profile thicknesses of the first and second profile part. Thus, the profile thickness of the first profile part of the upper hollow profile is very thick in relation to the Proflldicke of the second Profllteils. Such a hollow profile has an Iy / Iz of ~ 1, for example. Such a ratio corresponds to that of a round tube.
Bei dem mittleren Hohlprofil sind die Profildicken der beiden Profilteile ungefähr gleich stark. Bei der vorgeschlagenen Form für das Hohlprofil ergibt sich damit ein Verhältnis Iy/Iz von =1,35.In the middle hollow profile, the profile thickness of the two profile parts are about equally strong. In the proposed form for the hollow profile, this results in a ratio Iy / Iz of = 1.35.
Demgegenüber ist bei dem unteren Profilteil die Profilstärke des ersten Profilteils sehr viel dünner als bei dem zweiten Profilteil. Bei einer solchen Ausbildung des Hohlprofils beträgt das Verhältnis Iy/Iz =1,6. In contrast, in the lower profile part, the profile thickness of the first profile part is much thinner than in the second profile part. With such a design of the hollow profile, the ratio Iy / Iz = 1.6.

Claims

PATENTANSPRÜCHE: CLAIMS:
1. Hohlprofil (10), insbesondere für einen Fachwerkturm, mit einem ersten Profilteil (11) und einem zweiten Profilteil (12), wobei der Querschnitt des Hohlprofils (10) so ausgebildet ist, dass das erste Profilteil (11) zwei Schenkel (14, 15) aufweist und das zweite Profilteil (12) dergestalt zwischen den Schenkeln (14, 15) des ersten Profilteils (11) angeordnet ist, dass zur Bildung eines geschlossenen Hohlquerschnittes, die eine Endkante des zweiten Profilteils (12) mit einem Schenkel und die andere Endkante des zweiten Profilteils (12) mit dem anderen Schenkel des ersten Profilteils verbunden ist und zwar so, dass ein Teilabschnitt des jeweiligen Schenkels (14, 15) des ersten Profilteils (11) über die Verbindungsstelle hinausragt, dadurch gekennzeichnet, dass das erste und zweite Profilteil dergestalt ausgebildet ist, dass das Verhältnis der beiden Flächenträgheitsmomente (Iy, Iz) um die Flächenschwerpunktsachen (y, z) des Querschnitts des Hohlprofils (10) zwischen 0,9 und 1,6 liegt.1. hollow profile (10), in particular for a truss tower, with a first profile part (11) and a second profile part (12), wherein the cross section of the hollow profile (10) is formed so that the first profile part (11) has two legs (14 , 15) and the second profile part (12) between the legs (14, 15) of the first profile part (11) is arranged such that the formation of a closed hollow cross section, the one end edge of the second profile part (12) with a leg and the other end edge of the second profile part (12) is connected to the other leg of the first profile part in such a way that a portion of the respective leg (14, 15) of the first profile part (11) protrudes beyond the connection point, characterized in that the first and second profile part is formed such that the ratio of the two area moments of inertia (Iy, Iz) to the center of gravity matters (y, z) of the cross section of the hollow profile (10) between 0.9 and 1.6 lies.
2. Hohlprofil (10) gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Schenkel (14, 15) des ersten Profilteils (11) in einem Winkel zwischen 60° und 120° angeordnet sind.2. hollow profile (10) according to the preceding claim, characterized in that the legs (14, 15) of the first profile part (11) are arranged at an angle between 60 ° and 120 °.
3. Hohlprofil (10) gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Schenkel (14, 15) des ersten Profilteils (11) über einen Kreisabschnitt (13) miteinander verbunden sind.3. hollow profile (10) according to one of the preceding claims, characterized in that the legs (14, 15) of the first profile part (11) via a circular portion (13) are interconnected.
4. Hohlprofil (10) gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass beim ersten Profilteil (11) das Verhältnis der Dicke der Schenkel (14, 15) zu dem Radius des Kreisabschnitts (13) 1: 3 beträgt. 4. hollow profile (10) according to the preceding claim, characterized in that the first profile part (11), the ratio of the thickness of the legs (14, 15) to the radius of the circular section (13) is 1: 3.
5. Hohlprofil (10) gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das zweite Profilteil (12) so ausgebildet ist, dass im Bereich der Verbindungsstellen die Endkanten des zweiten Profilteils (12) in einem Winkel zwischen 70° - 110° zu den Schenkeln des ersten Profilteils angeordnet sind.5. hollow profile (10) according to one of the preceding claims, characterized in that the second profile part (12) is formed so that in the region of the joints, the end edges of the second profile part (12) at an angle between 70 ° - 110 ° to the Legs of the first profile part are arranged.
6. Hohlprofil (10) gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das zweite Profilteil (12) zwei Schenkel (17, 18) aufweist, die in einem Winkel zwischen 60° und 120° zueinander angeordnet sind.6. hollow profile (10) according to one of the preceding claims, characterized in that the second profile part (12) has two legs (17, 18) which are arranged at an angle between 60 ° and 120 ° to each other.
7. Hohlprofil (10) gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Schenkel (17, 18) des zweiten Profilteils (12) über einen Kreisabschnitt (16) miteinander verbunden sind.7. hollow profile (10) according to the preceding claim, characterized in that the legs (17, 18) of the second profile part (12) via a circular portion (16) are interconnected.
8. Hohlprofil (10) gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass beim zweiten Profilteil (12) das Verhältnis der Dicke der Schenkel (17, 18) zu dem Radius des Kreisabschnitts (16) 1: 3 beträgt.8. hollow profile (10) according to the preceding claim, characterized in that the second profile part (12) the ratio of the thickness of the legs (17, 18) to the radius of the circular section (16) is 1: 3.
9. Hohlprofil (10) gemäß einem der Ansprüche 6- 8, dadurch gekennzeichnet, die Endkanten der Schenkel (17, 18) des zweiten Profilteils (12) in einem Winkel (α) zwischen 110° und 160° nach außen gebogen sind.9. hollow profile (10) according to any one of claims 6- 8, characterized in that the end edges of the legs (17, 18) of the second profile part (12) at an angle (α) between 110 ° and 160 ° are bent outwards.
10. Hohlprofil (10) gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Profilteile (11, 12) aus Flachstahl hergestellt sind.10. hollow profile (10) according to one of the preceding claims, characterized in that the profile parts (11, 12) are made of flat steel.
11. Hohlprofil (10) gemäß einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Profilteile (11, 12) miteinander verschweißt sind. 11. hollow profile (10) according to one of the preceding claims, characterized in that the profile parts (11, 12) are welded together.
12. Verfahren zur Herstellung eines Hohlprofils (10) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass12. A method for producing a hollow profile (10) according to one of the preceding claims, characterized in that
- das erste Profilteil (11) aus einem Flachstahl hergestellt wird, der dergestalt gebogen wird, dass das erste Profilteil (11) einen Kreisabschnitt (13) mit zwei sich von dem Kreisabschnitt (13) erstrek- kenden Schenkeln (14, 15) aufweist,the first profile part (11) is produced from a flat steel which is bent in such a way that the first profile part (11) has a circular section (13) with two limbs (14, 15) extending from the circular section (13),
- das zweite Profilteil (12) aus einem Flachstahl hergestellt wird, der dergestalt gebogen wird, dass das zweite Profilteil (12) einen Kreisabschnitt (16) und zwei sich von dem Kreisabschnitt (16) erstreckende Schenkel (17, 18) aufweist,the second profile part (12) is produced from a flat steel which is bent in such a way that the second profile part (12) has a circular section (16) and two legs (17, 18) extending from the circular section (16),
- das die äußeren Enden der Schenkel (17, 18) des zweiten Profilteils (12) in einem Winkel zwischen 110° und 160° nach außen gebogen werden,- That the outer ends of the legs (17, 18) of the second profile part (12) are bent at an angle between 110 ° and 160 ° to the outside,
- das jeweils an den Schenkelendkanten des zweiten Profilteils (12) eine nach außen weisenden Fase (19, 20), mit einem Winkel zwischen 70° und 90° vorgesehen wird,- Which is provided at the leg end edges of the second profile part (12) has an outwardly facing bevel (19, 20), with an angle between 70 ° and 90 °,
- das zweite Profilteil (12) in dem ersten Profilteil (11) dergestalt angeordnet wird, dass die Spitzen der Fasen (19, 20) an den Schenkelendkanten des zweiten Profilteils (12) die Innenkanten der Schenkel des ersten Profilteils (11) berührt,- The second profile part (12) in the first profile part (11) is arranged such that the tips of the chamfers (19, 20) at the leg end edges of the second profile part (12) touches the inner edges of the legs of the first profile part (11),
- das die beiden Profilteile (11, 12) miteinander verschweißt werden.- That the two profile parts (11, 12) are welded together.
13. Verfahren gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Enden der Schenkel (14, 15) des ersten Profilteil (11) vor dem Verschweißen nach außen gebogen werden.13. The method according to the preceding claim, characterized in that the ends of the legs (14, 15) of the first profile part (11) are bent outwardly before welding.
14. Fachwerkturm mit mindestens drei Eckstielen für eine Windenergieanlage, die als Hohlprofil (10) ausgebildet sind, dadurch gekennzeichnet, dass das Hohlprofil (10) gemäß einem der vorhergehenden Ansprüche ausgebildet ist. 14. truss tower with at least three Eckstielen for a wind turbine, which are formed as a hollow profile (10), characterized in that the hollow profile (10) is designed according to one of the preceding claims.
15. Fachwerkturm für eine Windenergieanlage gemäß dem vorstehenden Anspruch, dadurch gekennzeichnet, dass die Eckstiele dergestalt ausgebildet sind, dass das Verhältnis der beiden Flächenträgheitsmomente (Iy, Iz) um die Flächenschwerpunktsachen (y, z) des Querschnitts des Hohlprofils (10) über die Länge des Turmes unterschiedlich ist. 15. truss tower for a wind turbine according to the preceding claim, characterized in that the corner handles are designed such that the ratio of the two area moments of inertia (Iy, Iz) to the center of gravity matters (y, z) of the cross section of the hollow profile (10) over the length of the tower is different.
EP07846582A 2006-11-14 2007-11-14 Hollow profiled element, particularly for a lattice tower; method for the production of such a hollow profiled element; lattice tower comprising at least three corner posts Withdrawn EP2089591A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006053480A DE102006053480A1 (en) 2006-11-14 2006-11-14 Hollow profile, in particular for a truss tower, method for producing a hollow profile, truss tower with at least three corner posts
PCT/EP2007/009829 WO2008058714A1 (en) 2006-11-14 2007-11-14 Hollow profiled element, particularly for a lattice tower; method for the production of such a hollow profiled element; lattice tower comprising at least three corner posts

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EP2089591A1 true EP2089591A1 (en) 2009-08-19

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US (1) US20100126102A1 (en)
EP (1) EP2089591A1 (en)
CN (1) CN101558208A (en)
CA (1) CA2667567A1 (en)
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WO (1) WO2008058714A1 (en)

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CN101558208A (en) 2009-10-14
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US20100126102A1 (en) 2010-05-27
WO2008058714A1 (en) 2008-05-22

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