EP2545231A1 - A corner connection, in particular for a wind turbine tower - Google Patents

A corner connection, in particular for a wind turbine tower

Info

Publication number
EP2545231A1
EP2545231A1 EP10770747A EP10770747A EP2545231A1 EP 2545231 A1 EP2545231 A1 EP 2545231A1 EP 10770747 A EP10770747 A EP 10770747A EP 10770747 A EP10770747 A EP 10770747A EP 2545231 A1 EP2545231 A1 EP 2545231A1
Authority
EP
European Patent Office
Prior art keywords
corner connection
segments
wind turbine
inwardly bent
portions
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.)
Granted
Application number
EP10770747A
Other languages
German (de)
French (fr)
Other versions
EP2545231B1 (en
Inventor
Henrik Stiesdal
Anders Nygaard Rasmussen
Arne Kryger
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.)
Siemens AG
Andresen Towers AS
Original Assignee
Siemens AG
Andresen Towers AS
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 Siemens AG, Andresen Towers AS filed Critical Siemens AG
Priority to EP10770747.3A priority Critical patent/EP2545231B1/en
Publication of EP2545231A1 publication Critical patent/EP2545231A1/en
Application granted granted Critical
Publication of EP2545231B1 publication Critical patent/EP2545231B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • E04H12/085—Details of flanges for tubular masts

Definitions

  • a corner connection in particular for a wind turbine tower
  • the present invention relates to a corner connection, in particular for a wind turbine tower, connecting four adjacent tower segments by portions inwardly bent along a horizontal or vertical direction, whereby the lengths of the inwardly bent portions along the horizontal or vertical direction are alternated and two inwardly bent portions along the horizon ⁇ tal or vertical direction form a butt joint.
  • Wind turbine towers consisting of steel segments are well known.
  • the segmentation may be horizontal and/or vertical relative to an erected tower.
  • Common wind turbine towers comprise vertically segmented steel segments which are con ⁇ nected to adjacent steel segments.
  • the connection of the segments to each other may be done in various ways, e. g. by bolted flange connections, bolted overlap connections and/or bolted splice plate connections.
  • wind turbine towers are further segmented by horizontally aligned connections substantially connecting a circular or polygonal shaped section on top of each other.
  • the connec ⁇ tion of the sections to each other may also be done in vari ⁇ ous ways, e. g. as bolted flange connections or bolted over ⁇ lap connections.
  • a wind turbine tower according to the preamble of claim 1 is known from WO 2009/097858 Al .
  • each tower element has an outer surface and an inner surface, where the periphery of the tower element is made up of a num- ber of segments preferably made of steel, the segments are provided with inwardly facing flanges at the longitudinal sides, where these flanges are connected to corresponding flanges on laterally arranged segments.
  • the individual seg- ments are made with an overlap on the outer surface at the transverse joints and with a butt joint at the inwardly fac ⁇ ing flanges.
  • Wind turbine towers of large wind turbines are influenced by huge forces occurring from the weight of the nacelle and ro ⁇ tor installed on the top of the tower and from the aerody ⁇ namic influence on the rotor which in turn is transferred to the tower.
  • large forces are transferred through the connections and es ⁇ pecially at "corner" regions where adjacent segments and sec ⁇ tions meet.
  • a typical corner region comprises adjacent seg ⁇ ments connected at vertical connections and adjacent sections connected at horizontal connections.
  • this object is achieved in the above defined corner connection in that at least one splice plate is connected to the butt joint.
  • the splice plate improves the load transfer at the corners of connected tower segments, which is a weak point in conven ⁇ tional wind turbine towers. Due to the fact that the lengths of the inwardly bent por ⁇ tions along the horizontal or vertical direction are alter ⁇ nated a connection is achieved which is able to transfer the loads from one segment to an adjacent segment. According to a first embodiment of an inventive corner con ⁇ nection the portions may be inwardly bent along the vertical direction and the sections are overlapping horizontally. This embodiment is preferred for segmented wind turbine tow ⁇ ers .
  • the portions may be inwardly bent along the horizontal direction and the sections are overlapping vertically.
  • an inventive corner connection comprises two inwardly bent portions along the horizontal or vertical direction form a butt joint.
  • an inventive corner connection comprises two butt joints at displaced positions. The fact that the butt joints are spaced apart from each other reduces peak stresses.
  • bolted holes are provided near the butt joints.
  • the bolted connections ensure a sufficient load transfer across the corner connection.
  • the inventive corner connection comprises at least one splice plate connected to the butt joint.
  • the splice plate may be connected to the butt joint by bolted connections in order to improve the transfer of loads.
  • the invention relates to a wind turbine tower.
  • the segments are con ⁇ nected by corner connections as described.
  • FIG. 1 detail of an inventive segmented wind turbine tower
  • Fig. 2 is a detail of a non-inventive corner connection
  • Fig. 3 shows the corner connection of fig. 2 during installation
  • Fig. 4 shows the corner connection of fig. 2 during installation
  • Fig. 5 is a detail of an inventive corner connection.
  • Fig. 1 shows a detail of the lower part of a wind turbine tower 1 comprising segmented steel segments 2 which are connected to adjacent steel segments 2.
  • the wind turbine tower 1 is further segmented by horizontally aligned connections 3 connecting circular or polygonal shaped sections on top of each other.
  • Fig. 2 shows a detail of a corner connection 4 by which four single steel segments 5, 6, 7, 8 are connected together.
  • Each steel segment 5, 6, 7, 8 comprises an inwardly bent por ⁇ tion 9, 10, 11, 12 which is bent along the vertical direc- tion.
  • the sections 5, 8 and 6, 7 are overlapping horizontally.
  • An overlap connection is realized by holes 13 which are provided at the lower ends of steel segments 5, 6 and at the upper ends of steel segments 7, 8. Overlap portions are provided with holes 13, into which bolted connections are inserted.
  • Arrows 14 in fig. 2 indicate how the steel segments 5, 6, 7, 8 are engaged.
  • the vertical lengths of the bent portions 9, 10 of the steel segments 5, 6 are al ⁇ ternated to allow an overlap.
  • the bent portions 11, 12 of steel segments 7, 8 have alternated vertical lengths.
  • the bent portions 10, 11 of steel segments 6, 7, which are arranged on top of each other form a butt joint.
  • the bent portions 9, 12 of steel seg ⁇ ments 5, 8 form a butt joint.
  • the two butt joints are at displaced positions.
  • Fig. 3 shows the corner connection 4 during installation.
  • Steel segment 5 overlaps steel segment 8
  • steel segment 6 overlaps steel segment 7, the overlap connection is secured by bolts which are inserted through holes 13.
  • Bent portions 9 to 12 are bent approximately 90 degrees with regard to the steel segments 5, 6, 7, 8. Bent portions 9, 12 form a first butt joint, bent portions 10, 11 form a second butt joint, both butt joints are vertically displaced from each other.
  • through holes 20 are provided in the area of the butt joints. In fig. 3 only one through hole 20 is depicted, whereas plural through holes may be pre ⁇ sent .
  • Fig. 5 shows another embodiment of a corner connection 16 which is a further development of the corner connection 4 as depicted in fig. 2 to fig. 4.
  • Corner connection 16 connects steel segments 5, 6, 7, 8 with bent portions 9, 10, 11, 12, whereby bent portions 9, 12 and 10, 11 each form butt joints which are displaced from each other in vertical direction.
  • splice plates 17, 18 are used, which are posi ⁇ tioned on either side of the butt joints.
  • Connection of the splice plates 17, 18 to the butt joints is realized by bolted connections 19, comprising bolts, washers and nuts.
  • the in- creased stability of the corner connection 16 is effected by "diagonal" bent portions of steel segments, e. g. bent por ⁇ tions 9 and 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wind Motors (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

A corner connection (4, 16), in particular for a wind turbine tower (1), connecting four adjacent tower segments (5, 6, 7, 8) by portions (9, 10, 11, 12) inwardly bent along a horizontal or vertical direction, whereby the lengths of the inwardly bent portions (9, 10, 11, 12) along the horizontal or vertical direction are alternated and two inwardly bent portions (9, 10, 11, 12) along the horizontal or vertical direction form a butt joint, whereby the at least one splice plate (17, 18) is connected to the butt joint.

Description

Description
A corner connection, in particular for a wind turbine tower The present invention relates to a corner connection, in particular for a wind turbine tower, connecting four adjacent tower segments by portions inwardly bent along a horizontal or vertical direction, whereby the lengths of the inwardly bent portions along the horizontal or vertical direction are alternated and two inwardly bent portions along the horizon¬ tal or vertical direction form a butt joint.
Wind turbine towers consisting of steel segments are well known. The segmentation may be horizontal and/or vertical relative to an erected tower. Common wind turbine towers comprise vertically segmented steel segments which are con¬ nected to adjacent steel segments. The connection of the segments to each other may be done in various ways, e. g. by bolted flange connections, bolted overlap connections and/or bolted splice plate connections.
Apart from the vertically segmented steel segments common wind turbine towers are further segmented by horizontally aligned connections substantially connecting a circular or polygonal shaped section on top of each other. The connec¬ tion of the sections to each other may also be done in vari¬ ous ways, e. g. as bolted flange connections or bolted over¬ lap connections. A wind turbine tower according to the preamble of claim 1 is known from WO 2009/097858 Al . The wind turbine tower com¬ prises several tower elements mounted on top of each other, each tower element has an outer surface and an inner surface, where the periphery of the tower element is made up of a num- ber of segments preferably made of steel, the segments are provided with inwardly facing flanges at the longitudinal sides, where these flanges are connected to corresponding flanges on laterally arranged segments. The individual seg- ments are made with an overlap on the outer surface at the transverse joints and with a butt joint at the inwardly fac¬ ing flanges. Wind turbine towers of large wind turbines are influenced by huge forces occurring from the weight of the nacelle and ro¬ tor installed on the top of the tower and from the aerody¬ namic influence on the rotor which in turn is transferred to the tower. In a wind turbine tower constructed of steel seg- ments which is divided into sections as previously discussed, large forces are transferred through the connections and es¬ pecially at "corner" regions where adjacent segments and sec¬ tions meet. A typical corner region comprises adjacent seg¬ ments connected at vertical connections and adjacent sections connected at horizontal connections.
It is therefore an object of the present invention to provide a corner connection, in particular for a wind turbine tower, which ensures that forces are sufficiently transferred be- tween connected tower segments.
According to the present invention this object is achieved in the above defined corner connection in that at least one splice plate is connected to the butt joint.
The splice plate improves the load transfer at the corners of connected tower segments, which is a weak point in conven¬ tional wind turbine towers. Due to the fact that the lengths of the inwardly bent por¬ tions along the horizontal or vertical direction are alter¬ nated a connection is achieved which is able to transfer the loads from one segment to an adjacent segment. According to a first embodiment of an inventive corner con¬ nection the portions may be inwardly bent along the vertical direction and the sections are overlapping horizontally. This embodiment is preferred for segmented wind turbine tow¬ ers .
According to an alternative embodiment the portions may be inwardly bent along the horizontal direction and the sections are overlapping vertically.
In the inventive corner connection two inwardly bent portions along the horizontal or vertical direction form a butt joint. Preferably an inventive corner connection comprises two butt joints at displaced positions. The fact that the butt joints are spaced apart from each other reduces peak stresses.
In order to ensure a sufficient stiffness in the inventive corner connection it may be envisaged that bolted holes are provided near the butt joints. The bolted connections ensure a sufficient load transfer across the corner connection.
The inventive corner connection comprises at least one splice plate connected to the butt joint. The splice plate may be connected to the butt joint by bolted connections in order to improve the transfer of loads.
Even higher loads can be borne by the inventive corner con- nection when two splice plates are connected to the butt joint, one on each side.
Further the invention relates to a wind turbine tower. In the inventive wind turbine tower the segments are con¬ nected by corner connections as described.
The invention and its underlying principle will be better understood when consideration is given to the following de- tailed description of preferred embodiments.
In the accompanying drawings: Fig. 1 detail of an inventive segmented wind turbine tower;
Fig. 2 is a detail of a non-inventive corner connection;
Fig. 3 shows the corner connection of fig. 2 during installation;
Fig. 4 shows the corner connection of fig. 2 during installation; and
Fig. 5 is a detail of an inventive corner connection.
Fig. 1 shows a detail of the lower part of a wind turbine tower 1 comprising segmented steel segments 2 which are connected to adjacent steel segments 2. The wind turbine tower 1 is further segmented by horizontally aligned connections 3 connecting circular or polygonal shaped sections on top of each other.
Fig. 2 shows a detail of a corner connection 4 by which four single steel segments 5, 6, 7, 8 are connected together.
Each steel segment 5, 6, 7, 8 comprises an inwardly bent por¬ tion 9, 10, 11, 12 which is bent along the vertical direc- tion. In the installed state the sections 5, 8 and 6, 7 are overlapping horizontally. An overlap connection is realized by holes 13 which are provided at the lower ends of steel segments 5, 6 and at the upper ends of steel segments 7, 8. Overlap portions are provided with holes 13, into which bolted connections are inserted.
Arrows 14 in fig. 2 indicate how the steel segments 5, 6, 7, 8 are engaged. As can be seen in fig. 2 the vertical lengths of the bent portions 9, 10 of the steel segments 5, 6 are al¬ ternated to allow an overlap. Similarly the bent portions 11, 12 of steel segments 7, 8 have alternated vertical lengths. On the other hand the bent portions 10, 11 of steel segments 6, 7, which are arranged on top of each other form a butt joint. Similarly the bent portions 9, 12 of steel seg¬ ments 5, 8 form a butt joint. The two butt joints are at displaced positions. Fig. 3 shows the corner connection 4 during installation. Steel segment 5 overlaps steel segment 8, steel segment 6 overlaps steel segment 7, the overlap connection is secured by bolts which are inserted through holes 13. Bent portions 9 to 12 are bent approximately 90 degrees with regard to the steel segments 5, 6, 7, 8. Bent portions 9, 12 form a first butt joint, bent portions 10, 11 form a second butt joint, both butt joints are vertically displaced from each other. In order to ensure that loads can be sufficiently transferred through the corner connection 4 through holes 20 are provided in the area of the butt joints. In fig. 3 only one through hole 20 is depicted, whereas plural through holes may be pre¬ sent .
In the schematic drawing of fig. 4 one can see that the butt joint consisting of bent portions 9, 12 and the butt joint consisting of bent portions 10, 11 are further connected by a bolted connection 15 across the butt joints.
Fig. 5 shows another embodiment of a corner connection 16 which is a further development of the corner connection 4 as depicted in fig. 2 to fig. 4. Corner connection 16 connects steel segments 5, 6, 7, 8 with bent portions 9, 10, 11, 12, whereby bent portions 9, 12 and 10, 11 each form butt joints which are displaced from each other in vertical direction. In order to further increase the stability of the corner con¬ nection 16 splice plates 17, 18 are used, which are posi¬ tioned on either side of the butt joints. Connection of the splice plates 17, 18 to the butt joints is realized by bolted connections 19, comprising bolts, washers and nuts. The in- creased stability of the corner connection 16 is effected by "diagonal" bent portions of steel segments, e. g. bent por¬ tions 9 and 11.

Claims

Claims
1. A corner connection (4, 16), in particular for a wind turbine tower (1), connecting four adjacent tower segments (5, 6, 7, 8) by portions (9, 10, 11, 12) inwardly bent along a horizontal or vertical direction, whereby the lengths of the inwardly bent portions (9, 10, 11, 12) along the horizon¬ tal or vertical direction are alternated and two inwardly bent portions (9, 10, 11, 12) along the horizontal or verti- cal direction form a butt joint, characterised in that at least one splice plate (17, 18) is connected to the butt j oint .
2. A corner connection according to claim 1, characterised in that the portions (9, 10, 11, 12) are inwardly bent along the vertical direction and the segments (5, 6, 7, 8) are overlapping horizontally.
3. A corner connection according to claim 1, characterised in that the portions (9, 10, 11, 12) are inwardly bent along the horizontal direction and the sections are overlapping vertically .
4. A corner connection according to any of the preceding claims, characterised in that it comprises two butt joints at displaced positions.
5. A corner connection according to claim 4, characterised in that bolted holes are provided near the butt joints.
6. A corner connection according to any of the preceding claims, characterised in that two splice plates (17, 18) are connected to the butt joint.
7. A corner connection according to any of the preceding claims, characterised in that the at least one splice plate (17, 18) is connected to the butt joint by bolted connections (19) .
8. A corner connection according to any of the preceding claims, characterized in that the segments (5, 6, 7, 8) are made from steel.
9. A wind turbine tower, comprising of plural connected segments (5, 6, 7, 8) , characterised in that the segments (5, 6, 7, 8) are connected by corner connections (4, 16) ac cording to any of claims 1 to 8.
EP10770747.3A 2010-05-25 2010-10-01 A corner connection, in particular for a wind turbine tower Active EP2545231B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10770747.3A EP2545231B1 (en) 2010-05-25 2010-10-01 A corner connection, in particular for a wind turbine tower

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10163752 2010-05-25
PCT/EP2010/064649 WO2011147478A1 (en) 2010-05-25 2010-10-01 A corner connection, in particular for a wind turbine tower
EP10770747.3A EP2545231B1 (en) 2010-05-25 2010-10-01 A corner connection, in particular for a wind turbine tower

Publications (2)

Publication Number Publication Date
EP2545231A1 true EP2545231A1 (en) 2013-01-16
EP2545231B1 EP2545231B1 (en) 2015-07-29

Family

ID=43757822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10770747.3A Active EP2545231B1 (en) 2010-05-25 2010-10-01 A corner connection, in particular for a wind turbine tower

Country Status (3)

Country Link
EP (1) EP2545231B1 (en)
DK (1) DK2545231T3 (en)
WO (1) WO2011147478A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3392502A1 (en) * 2017-04-20 2018-10-24 Nordex Energy GmbH Tower of a wind power plant, and method for building a tower of a wind power plant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ605916A (en) 2010-07-13 2015-01-30 Andresen Towers As Method of assembling a tubular building structure by using screw sockets
DE102016106525A1 (en) * 2016-04-08 2017-10-12 Wobben Properties Gmbh Connecting body, wind turbine tower ring segment and method for connecting two wind turbine tower ring segments
DE102020124912A1 (en) * 2020-09-24 2022-03-24 Wobben Properties Gmbh Coupling device for coupling tower segments of a tower of a wind turbine, tower segment, part of a tower, tower, wind turbine and assembly method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823650C2 (en) * 1998-05-27 2001-05-23 Wilfried Arand Method and device for producing tall, hollow, tower-like structures of up to two hundred meters in height and more, in particular towers for wind turbines
DE102007018025A1 (en) * 2007-04-17 2008-10-23 Nordex Energy Gmbh Wind turbine tower
ES2695549T3 (en) 2008-02-06 2019-01-09 Vestervangen Holding Odense Aps Tower element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011147478A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3392502A1 (en) * 2017-04-20 2018-10-24 Nordex Energy GmbH Tower of a wind power plant, and method for building a tower of a wind power plant

Also Published As

Publication number Publication date
EP2545231B1 (en) 2015-07-29
DK2545231T3 (en) 2015-10-05
WO2011147478A1 (en) 2011-12-01

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