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.

Applications Claiming Priority (2)

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• 2006
  • 2006-11-14 DE DE102006053480A patent/DE102006053480A1/de not_active Withdrawn
• 2007
  • 2007-11-14 CN CNA2007800415436A patent/CN101558208A/zh active Pending
  • 2007-11-14 US US12/514,875 patent/US20100126102A1/en not_active Abandoned
  • 2007-11-14 WO PCT/EP2007/009829 patent/WO2008058714A1/de active Application Filing
  • 2007-11-14 CA CA002667567A patent/CA2667567A1/en not_active Abandoned
  • 2007-11-14 EP EP07846582A patent/EP2089591A1/de not_active Withdrawn

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