U.S. patent application number 13/904083 was filed with the patent office on 2013-12-05 for transportation and stacking of curved blades lying oppositely and above each other.
The applicant listed for this patent is Kim Lieberknecht, Kenneth Helligsoe Svinth, Maja Rose Wieland. Invention is credited to Kim Lieberknecht, Kenneth Helligsoe Svinth, Maja Rose Wieland.
Application Number | 20130319891 13/904083 |
Document ID | / |
Family ID | 46229262 |
Filed Date | 2013-12-05 |
United States Patent
Application |
20130319891 |
Kind Code |
A1 |
Lieberknecht; Kim ; et
al. |
December 5, 2013 |
TRANSPORTATION AND STACKING OF CURVED BLADES LYING OPPOSITELY AND
ABOVE EACH OTHER
Abstract
An arrangement is provided for holding blades for a wind
turbine. The arrangement includes a first end frame and a first
centre frame. The first end frame is configured for holding a first
root end of a first blade. The first end frame is formed for being
coupled to a supporting base. The first centre frame is configured
for holding a first centre section of the first blade in such a way
that the first centre section is spaced from a first tip end of the
first blade. The first centre frame is formed for being coupled to
the supporting base.
Inventors: |
Lieberknecht; Kim; (Arhus
N., DK) ; Svinth; Kenneth Helligsoe; (Aarhus C,
DK) ; Wieland; Maja Rose; (Brabrand, DK) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Lieberknecht; Kim
Svinth; Kenneth Helligsoe
Wieland; Maja Rose |
Arhus N.
Aarhus C
Brabrand |
|
DK
DK
DK |
|
|
Family ID: |
46229262 |
Appl. No.: |
13/904083 |
Filed: |
May 29, 2013 |
Current U.S.
Class: |
206/448 ;
29/428 |
Current CPC
Class: |
F05B 2240/40 20130101;
F05B 2260/02 20130101; B65D 85/68 20130101; Y02E 10/72 20130101;
Y10T 29/49826 20150115; F03D 13/40 20160501 |
Class at
Publication: |
206/448 ;
29/428 |
International
Class: |
B65D 85/68 20060101
B65D085/68 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 1, 2012 |
EP |
12170512.3 |
Claims
1. An arrangement for holding blades for a wind turbine, the
arrangement comprising: a first end frame for holding a first root
end of a first blade, wherein the first end frame is formed for
being coupled to a supporting base, and a first centre frame for
holding a first centre section of the first blade in such a way
that the first centre section is spaced from a first tip end of the
first blade, wherein the first centre frame is formed for being
coupled to the supporting base.
2. The arrangement according to claim 1, wherein the arrangement is
configured for holding curved blades.
3. The arrangement according to claim 1, wherein the first centre
frame comprises an open profile with an open side such that the
first blade is inserable through the open side into the open
profile such that the open profile partially surrounds the first
blade.
4. The arrangement according to claim 3, wherein the open profile
is a U-shape profile.
5. The arrangement according to claim 1, wherein the first end
frame and the first centre frame are coupleable to the supporting
base such that a direction of a first chord line of a first profile
of the first centre section of the first blade is alignable
parallel to an upper surface of the supporting base.
6. The arrangement according to claim 1, wherein the first end
frame and the first centre frame are coupleable to the supporting
base such that the direction of the first chord line of the first
profile of the first centre section of the first blade is alignable
perpendicular with respect to an upper surface of the supporting
base.
7. The arrangement according to claim 1, wherein the first centre
frame comprises a carrying element, and wherein the carrying
element is formed such that the first centre frame is coupleable to
the supporting base.
8. The arrangement according to claim 1, further comprising a
second end frame for holding a second root end of a second blade,
wherein the second end frame is formed for being coupled to the
supporting base, and a second centre frame for holding a second
centre section of the second blade in such a way that the second
centre section is spaced from a second tip end of the second blade,
and wherein the second centre frame is formed for being coupled to
the supporting base.
9. The arrangement according to claim 8, wherein the second centre
frame is coupled to the first centre frame such that the second
centre frame is coupled to the supporting base by the first centre
frame.
10. The arrangement according to claim 8, wherein the second end
frame and the second centre frame are coupleable to the supporting
base such that a second direction of a second chord line of a
second profile of the second centre section of the second blade is
alignable parallel to an upper surface of the supporting base.
11. The arrangement according to claim 8, wherein the second end
frame and the second centre frame are coupleable to the second
supporting base such that the second direction of the second chord
line of the second profile of the second centre section of the
second blade is alignable perpendicular to an upper surface of the
supporting base.
12. The arrangement according to claim 8, wherein the first end
frame is further formed such that the second tip end of the second
blade is coupleable to the first end frame, and wherein the second
end frame is further formed such that the first tip end of the
first blade is coupleable to the second end frame.
13. A transporting system for transporting blades for a wind
turbine, the transporting system comprising: an arrangement for
holding blades according to claim 1, a transporting device
comprising the supporting base, and wherein the arrangement is
detachably coupled to the supporting base.
14. A method of holding blades for a wind turbine, the method
comprising coupling a first root end of a first blade to a first
end frame for holding the first root end, wherein the first end
frame is formed for being coupled to a supporting base, and
coupling a first centre section of the first blade to a first
centre frame for holding the first centre section in such a way
that the first centre section is spaced from a first tip end of the
first blade, wherein the first centre frame is formed for being
coupled to the supporting base.
Description
[0001] The present application claims priority to European Patent
Office application No. 12170512.3 EP filed Jun. 1, 2013, the entire
content of which is hereby incorporated herein by reference.
FIELD OF INVENTION
[0002] The present invention relates to an arrangement for holding
blades, in particular curved blades, for a wind turbine.
Furthermore, the present invention relates to a transporting system
for transporting blades, in particular for curved blades, for a
wind turbine. Moreover, the present invention relates to a method
of holding blades, in particular curved blades, for a wind
turbine.
BACKGROUND OF INVENTION
[0003] In modern wind turbines, wind turbine blades are pre-bended
or curved in order to increase the aerodynamic efficiency.
Pre-bended or curved blades take up more space than straight blades
so that curved blades makes it difficult to utilize the space when
stacking the blades during transportation.
[0004] U.S. Pat. No. 6,983,844 B2 discloses a method for
transporting a set of large blades for a wind turbine. Two wind
turbine blades are stacked opposed to each other, wherein a first
root end of a first wind turbine blade and a second tip end of a
second blade are fixed to a first end frame. A first tip end of the
first blade and a second root end of the second blade are fixed to
a second end frame. Hence, the first blade and the second blade are
stacked opposed to each other to respective root end frames. Due to
the length of the large blade, the stability during transportation
by holding the respective blades at the respective tip ends and
root ends is critical.
SUMMARY OF INVENTION
[0005] It is an object of the present invention to provide a
holding arrangement for blades, which provides a high stability for
the blades during transportation.
[0006] This object may be solved by an arrangement for holding
blades, in particular curved blades, for a wind turbine, by a
transporting system for transporting blades, in particular curved
blades for a wind turbine and by a method of holding blades, in
particular curved blades, for a wind turbine according to the
independent claims.
[0007] According to a first aspect of the present invention, an
arrangement for holding blades, in particular curved blades, for a
wind turbine is presented. The arrangement comprises a first end
frame for holding a first root end of the first blade and a first
center frame for holding a first center section of the first blade.
The first end frame is formed for being coupled to a supporting
base. The first center section is spaced from a first tip end of
the first blade, wherein the first center frame is formed for being
coupled to the supporting base.
[0008] According to a further aspect of the present invention, a
method of holding blades, in particular curved blades, for a wind
turbine is presented. According to the method, a first root end of
the first blade is coupled to a first end frame for holding the
first root end. The first end frame is formed for being coupled to
a supporting base. A first center section of the first blade is
coupled to a first center frame for holding the first center
section. The first center section is spaced from a first tip end of
the first blade, wherein the first center frame is formed for being
coupled to the supporting base.
[0009] A blade for a wind turbine comprises a length between a root
end of the blade and a tip end of the blade. The blade comprises an
aerodynamical profile which comprises a leading edge and a trailing
edge. In operation of the blade, the air streams against the
leading edge and streams away from the blade at the trailing edge.
An imaginary straight line which connects the leading edge and the
trailing edge is denoted as the chord line.
[0010] Furthermore, the blades may be pre-bended and may form a
curved shape along its length extension. At the root end a blade
comprises a generally circular cross-section which defines a
cross-sectional plane. At a center point of the cross-section at
the root end a connection line runs along a normal of the
cross-sectional plane. A center point at the cross-section of the
tip end lies onto the connection line which connects the center
point of the root end and the center point of the tip end. The
connection line is curved for a curved blade.
[0011] The center point at the tip end of a curved blade comprises
an offset to an imaginary straight line running along the normal of
the cross-sectional area at the root end and running through the
center point of the root end. In other words, the connection line
between the center point of the root end cross-section and the
center point of a tip end cross-section is curved.
[0012] The first end frame may comprise a plurality of beams for
forming a rigid frame. To the first end frame brackets may be
attached for holding the first root end of the first blade. The
first root end may in particular be detachably coupled to the first
end frame.
[0013] The center frame comprises a plurality of beams for forming
a rigid frame for holding the first center section of the first
blade in such a way that the first center section of the blade is
spaced from the first tip end of the first blade and the first root
end of the first blade. In particular, the center section is spaced
from the root end frame and is located within an interval between
approximately one third to approximately two third of the length
(i.e. the connection line) of the total length of the first blade
between the root end and the tip end of the first blade. The centre
frame may comprise brackets for holding the centre section. The
first blade may be fixed to the first end frame and/or the first
center frame by the bracket, by a strap and/or by a wire.
[0014] In particular, a curved blade may extend from the root end
parallel to the normal of the cross-sectional plane at the root end
in a straight way. After the center section is passed in direction
to the tip end, the curving of the blade is initiated so that the
connection line may not longer run straight and parallel to the
normal of the cross-sectional plane of the root end but runs along
a curved line. Furthermore, the curved blade may also comprise a
curvature from the root end to the tip end, for example. Hence, the
connection line may run curved between the root end and the tip end
of a respective blade. The center section may be defined between an
area between the root end of the blade and the (centre) section,
where the curving of the blade is initiated. Hence, if the center
frame holds the first center section of the first blade where the
center line of the blade is still parallel to the normal of the
cross-sectional area of the root end, a proper attaching of the
center frame to the center section is achieved.
[0015] Furthermore, if the center frame is attached to the blade at
the center section (e.g. where the blade runs still straight along
a straight line parallel to the normal of the cross-sectional plane
at the root end) a proper stacking of further second center frames
is achieved such that a better space saving stacking of a plurality
of blades is achieved. In particular, the centre frame may be
attached in line with the respective end frame.
[0016] Furthermore, the center of gravity of a blade is located
closer to the root end than to the tip end of the blade. Hence, by
attaching the center frame to the center section for holding the
blade, a bending of the blade during transportation due to its own
weight is reduced. Hence, a more stable and comfortable
transportation of the blades is achieved.
[0017] According to a further exemplary embodiment, the first
center frame comprises an open profile, in particular a U-shaped
profile, with an open side such that the first blade is insertable
through the open side into the open profile such that the open
profile partially surrounds the first blade.
[0018] According to a further exemplary embodiment, the first end
frame and the first center frame are coupleable to the supporting
base such that a direction of a first chord line of the first
profile of the center section of the first blade is aligned
parallel along an upper surface of the supporting base. In
particular, the chord line at the centre section may extend for
example along a (generally) horizontal direction.
[0019] According to a further exemplary embodiment, the first end
frame and the first center frame are coupleable to the supporting
base such that the direction of the first chord line of the first
profile of the first center section of the first blade is alignable
perpendicular with respect to an upper surface of the supporting
base. In particular, the chord line at the centre section may
extend for example along a (generally) horizontal direction.
[0020] In particular, the center frame and the end frame may be
formed in such a way, that both frames may be coupled to the
supporting base with a first orientation which is parallel to the
upper surface of the supporting base and may be further coupled to
the supporting base with a second orientation which is
perpendicular to the upper surface of the supporting base. Hence,
the blade may be coupled to the supporting base selectively in such
a way that the blade and its chord line is alignable either
perpendicular or parallel to the upper surface of the supporting
base (i.e. along the vertical direction or the horizontal
direction).
[0021] In other words, the first center frame and the first end
frame may be rotated with respect to the supporting base such that
a horizontal or a vertical alignment of the chord line of the blade
is adjustable.
[0022] According to a further exemplary embodiment, the first
center frame comprises a carrying element. The carrying element is
formed such that the first center frame stands on the supporting
base. The carrying element may comprise one or a plurality of
standing foots, for example. Furthermore, the carrying element may
comprise wheel devices, such that the first center frame is
rollable along the supporting base. If the root end is fixed to the
end frame and the centre section is fixed to the centre frame, a
height difference between the distance of the supporting base and
the root end on the one side and the supporting base and the centre
section on the other side may be overcome by the carrying
element.
[0023] According to a further exemplary embodiment, the arrangement
comprises a second end frame for holding a second root end of the
second blade, wherein the second end frame is formed for being
coupled to the supporting base. Furthermore, the arrangement
comprises a second center frame for holding a second center section
of the second blade, wherein the second center section is spaced
from a second tip end of the second blade. The second center frame
is coupled to the first center frame such that the second center
frame is coupled to the supporting base by the first center
section.
[0024] The second blade may have a straight or a curved shape. In
particular, the second blade may have the same shape as the first
blade. The second end frame may be identically formed and designed
as the first end frame.
[0025] The second center frame couples the second center section of
the second blade. The second center frame is coupled to the first
center frame and is thus indirectly coupled to the supporting base.
In particular, the second center frame is coupled above the first
center frame.
[0026] Hence, by the above-described exemplary embodiment, the
second blade is held to the arrangement above the first blade.
Furthermore, the second blade is orientated oppositely with respect
to the first blade, which means that the second tip end is located
close to the first end frame and the first tip end is located close
to the second end frame.
[0027] According to a further exemplary embodiment, the first end
frame is further formed such that the second tip end of the second
blade is coupleable to the first end frame. The second end frame is
further formed such that the first tip end of the first blade is
coupleable to the second end frame. In particular, the first tip
end may be further coupled to the second end frame and the second
tip end may be coupled to the first end frame.
[0028] Hence, by the above-described exemplary embodiment, the
arrangement is adapted for stacking two symmetrical and identically
shaped blades above each other, wherein the connection lines
connecting the respective root ends and tip ends of the respective
first and second blades are parallel with respect to each other.
The connection lines are the (straight or curved) lines which
connect the center point at the cross-section at the root end with
a center point at the cross-section at the tip end of the
respective blade.
[0029] According to a further exemplary embodiment, a transporting
system for transporting blades, in particular curved blades, for a
wind turbine, is presented. The transporting system comprises the
arrangement as described above for holding blades and a
transporting device comprising the supporting base. The arrangement
is detachably coupled to the supporting base.
[0030] The transport device may be for example a truck, a cargo
ship or a train.
[0031] Because the arrangement and in particular the end frames and
the first center frame are detachably coupled to the supporting
base, the arrangement may be used along the entire supply chain. In
particular, between the transportation from the factory to the site
of operation, the respective end frames and center frames may rest
on the blade to be held. Between the transport devices, e.g.
between a transportation by truck, by ship or by train, the blades
have not to be detached from the respective frames because the
frames may be carried over from one transportation device to the
other transportation device together with the respective
blades.
[0032] By the present invention, in particular an efficient curved
blade transportation and stacking arrangement is achieved. The
curved blades (first blade and second blade) are held with a
respective root end frame and a respective center frame in such a
way, that the curved blades may be placed oppositely against and
above each other, whereby the first center frame and the second are
coupled to each other and are aligned above each other.
[0033] Furthermore, by the present invention it is also possible to
transport more blades within the same space due to applying the
arrangement for supporting the curved blades at the center
sections. Hence, the total length of a curved blade stack by the
above-described arrangement is reduced in comparison to
conventional stacking arrangements as the length of the stack as
described by the present invention is substantially of the same
length as of a respective curved blade. Hence, it is possible to
transport more curved blade stacks on a ship which makes also the
transportation cheaper. Due to the alignment of the chord lines of
the blades to be held along the vertical and/or the horizontal
direction, the width or the height of the stack is reducible
depending on the needs of the respective transportation device.
[0034] Furthermore, a blade tip protection may be attached to a
respective tip end of a blade. The blade tip protection may
comprise polystyrene or foam protection means. Furthermore, damping
means may be attached to the tip end protection means for
stabilizing the tip end during transportation.
[0035] In particular, during transportation between the factory and
the site of operation of the wind turbine, the first blade and the
second blade may be mounted together two and two and may be
transported and moved together all the way.
[0036] It has to be noted that embodiments of the invention have
been described with reference to different subject matters. In
particular, some embodiments have been described with reference to
apparatus type claims whereas other embodiments have been described
with reference to method type claims. However, a person skilled in
the art will gather from the above and the following description
that, unless otherwise notified, in addition to any combination of
features belonging to one type of subject matter also any
combination between features relating to different subject matters,
in particular between features of the apparatus type claims and
features of the method type claims is considered as to be disclosed
with this application.
BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The aspects defined above and further aspects of the present
invention are apparent from the examples of embodiment to be
described hereinafter and are explained with reference to the
examples of embodiment. The invention will be described in more
detail hereinafter with reference to examples of embodiment but to
which the invention is not limited.
[0038] FIG. 1 shows an arrangement for holding blades according to
an exemplary embodiment of the present invention, wherein the chord
line of a centre section of a blade is aligned along a generally
vertical direction;
[0039] FIG. 2 shows an arrangement for holding blades according to
an exemplary embodiment of the present invention, wherein the chord
line of a centre section of a blade is aligned along a generally
horizontal direction;
[0040] FIG. 3 shows an arrangement for holding two blades according
to an exemplary embodiment of the present invention;
[0041] FIG. 4 shows a transporting arrangement for transporting
blades according to an exemplary embodiment of the present
invention;
[0042] FIG. 5 shows a stack of four blades above each other
according to an exemplary embodiment of the present invention;
and
[0043] FIG. 6 shows a transporting arrangement for transporting
blades on a ship.
DETAILED DESCRIPTION OF INVENTION
[0044] The illustrations in the drawings are schematical. It is
noted that in different figures, similar or identical elements are
provided with the same reference signs.
[0045] FIG. 1 shows an arrangement 100 for holding blades, in
particular curved blades, for a wind turbine. The arrangement 100
comprises a first end frame 110 for holding a first root end 102 of
a first blade 101. Furthermore, the arrangement 100 comprises a
first center frame 111 for holding a first center section 103 of
the first blade 101. The first end frame 110 is formed for being
coupled to a supporting base 120. The first end frame 110 comprises
a bracket or other fixing means for fixing and holding the first
root end 102 of the first blade 101.
[0046] The first center frame 111 comprises a U-shaped profile
which comprises an open side 212 (see FIG. 2) through which the
first blade 101 is insertable. The first center frame 111 is
coupleable to the supporting base 120.
[0047] The first blade 101 comprises an aerodynamic profile
comprising a leading edge and a trailing edge. Moreover, the first
blade 101 comprises a span width defining the length between the
first root end 102 and the first tip end 104 of the first blade
101. A chord line 105 is an imaginary straight line which connects
the leading edge and the trailing edge. As can be taken from FIG.
1, the first end frame 110 and the first center frame 111 hold the
first blade 101 in such a way that the first chord line 105 (e.g.
at the root end 102 and/or the first centre section 103) is aligned
generally perpendicular (vertically) along an upper surface of the
supporting base.
[0048] The first center section 103 of the first blade 101 may be a
section of the first blade 101 which is spaced from the first tip
end 104 and the first root end 102. In particular, as can be taken
from FIG. 1, the first center section 103 is defined at an
approximately half length of the span width of the first blade 101.
In particular, the center of gravity of the first blade 101 is
located closer to the centre frame 111 than to a tip end frame (not
shown).
[0049] FIG. 2 shows an arrangement 100 for holding blades. The
arrangement 100 shown in FIG. 2 comprises the same features as the
arrangement 100 as shown in FIG. 1. In contrast to the embodiment
as shown in FIG. 1, the arrangement 100 shown in FIG. 2 holds the
first blade 101 in such a way that the first chord line 105 of the
first profile of the first center section 103 of the first blade
101 is aligned approximately parallel to the upper surface of the
supporting base 120 (e.g. along an horizontal direction).
[0050] As can be taken from FIG. 2, the first end frame 110
comprises a four-sided surrounding frame, wherein each side of the
frame may be abutted onto the supporting base 120. Hence, the first
end frame 110 may be simply rotated around 90.degree. so that the
first blade 110 and its first chord line 105, respectively, is also
simply rotated around 90.degree..
[0051] Also the first center frame 111 may be rotated around
90.degree. together with the first blade 110. In particular, if the
blade 110 is a curved blade, the center frame 111 may not longer
directly abut onto the supporting base 120. However, a carrying
element may be applied which comprises standing foots 213 such that
the first center frame 111 stands on the supporting base 120.
[0052] In order to protect the tip end 104 of the first blade 101,
a tip end cover 201 may be attached to the first tip end 104.
[0053] FIG. 3 shows an arrangement 100 which holds the first blade
101 and a second blade 301.
[0054] The first blade 101 and the second blade 301 are curved
blades. The second blade 301 may comprise the same shape and the
same features as the first blade 101. The second blade 301
comprises a second root end 302, a second center section 303 and a
second tip end 304. Furthermore, in FIG. 3, a second chord line 305
(e.g. at the second root end 302 and/or the second centre section
303) which connects the leading edge with the trailing edge of the
second blade 301 is shown. The first blade 101 shown in FIG. 3 is
coupled with its first root end 102 to the first end frame 110.
[0055] The first center section 103 of the first blade 101 is fixed
to the first center frame 111. The first center frame 111 stands
with standing foots 213 of a carrying element on the supporting
base 120, for example. The first tip end 104 is covered by a tip
end cover 201.
[0056] The second root end 302 of the second blade 301 is coupled
to a second end frame 310. The second end frame 310 may have the
same shape and features as the first end frame 110, for
example.
[0057] The second center section 303 of the second blade 301 is
fixed to a second center frame 311. The second center frame 311 may
comprise an open profile with an open side.
[0058] The second center frame 311 abuts onto the first center
frame 111. The second center frame 311 may be detachably coupled
and fixed to the first center frame 111.
[0059] The first center frame 111 and the second center frame 311
may be aligned to each other in such a way that the orientation of
the first open profile of the first center frame 111 is oppositely
orientated with respect to the second open profile of the second
center frame 311. As can be taken in FIG. 3, the first center frame
111 and the second center frame 311 may form together an S-shaped
profile, for example.
[0060] The second blade 301 is held by the second end frame 310 and
the second center frame 311 in such a way that the second blade 301
is held above the first blade 101.
[0061] Furthermore, the first end frame 110 may be formed such that
the second tip end 304 of the second blade 301 is fixable.
Additionally, the second end frame 310 is further formed such that
the first tip end 104 of the first blade 101 is fixable to the
second end frame 310.
[0062] As can be taken from FIG. 3, the first end frame 110, the
first center frame 111, the second end frame 310 and the second
center frame 311 are aligned such that the first blade 101 and the
second blade 301 are held in such a way that its chord lines 105,
305 are aligned along a generally horizontal direction. Hence, a
very flat stacking of the blades 101, 301 is achieved.
[0063] FIG. 4 shows a transporting truck 400 as a transporting
device for a transporting system. The transporting truck 400
comprises a first supporting base part 401 of the supporting base
120 and a further supporting base part 402 of the supporting base
120. The further supporting base part 402 may be for example a
trailer which is coupled to the transporting truck 400 by the
blades 101, 301 to be transported.
[0064] The first blade 101 and the second blade 301 are held
together by the arrangement 100 as shown in FIG. 3. Furthermore,
the first center frame 111 and the second center frame 311 form a
rigid and bend-proof arrangement, such that the blades 101, 301
will not be bended differently with respect to each other during
transportation such that its center sections 103, 303 do not
contact the ground, for example. The first centre frame 111 is
hence indirectly coupled to one of the supporting base parts 401,
402 via the respective blades 101, 301.
[0065] Dependent on the space requirements during transportation,
the end frames 110, 310 and center frames 111, 311 may be aligned
in such a way that the chord lines 105, 305 (e.g. at the respective
root ends 102, 302 and/or the respective centre sections 103, 303)
are aligned along a generally horizontal direction (relatively flat
stacking) or an approximately vertical direction (for reducing the
width of the transporting system).
[0066] FIG. 5 shows a blade stack 500 comprising the arrangement
100 according to the present invention. As shown in FIG. 5, four
(e.g. identically shaped) blades 101, 301, 501 and 531 are stacked
above each other along a vertical direction.
[0067] The first blade 101 and the second blade 301 are held by the
respective end frames 110, 310 and center frames 111, 311 as shown
in FIG. 3. Above the arrangement 100 a further arrangement 520, as
shown in FIG. 3, may be attached above the arrangement 100. The
further arrangement 520 comprises a third end frame 510, a third
center frame 511, a fourth center frame 513 and a fourth end frame
512. To the third end frame 510 a third root end 502 of the third
blade 501 is attached.
[0068] A third center section 503 of the third blade 501 is
attached to the third center frame 511. A third tip end 504 forms a
free end of the third blade 501. The third blade 501 runs below the
fourth blade 531. A fourth root end 532 is fixed to the fourth end
frame 512 and a fourth center section 533 is fixed to a fourth
center frame 513. A fourth tip end 534 forms a free end of the
fourth blade 531.
[0069] The fourth chord line 535 at the fourth center section 533
and the third chord line 505 at the third center section 503 are
generally aligned along a horizontal direction.
[0070] In order to provide a more robust arrangement 100, 520, the
open profile of the center sections 111, 311, 511, 513 may be
closed at its open sides with a respective support bar 506. Hence,
the weight force may additionally transferred by the support bar
506 to the supporting base 120.
[0071] The blade stack 500 may comprise a plurality of arrangements
100, 520 which are attached above each other or besides each other
along a horizontal direction.
[0072] FIG. 6 shows a transporting system with a transport ship 600
as a transport device. Onto the ship supporting base 601, a
plurality of blade stacks 500 as shown in FIG. 5 may be
transported. As shown in FIG. 6, due to the above-described
stacking arrangement 100, 520, the curved blades 101, 301, 501, 531
may be packed in a very space-saving manner.
[0073] It should be noted that the term "comprising" does not
exclude other elements or steps and "a" or "an" does not exclude a
plurality. Also elements described in association with different
embodiments may be combined. It should also be noted that reference
signs in the claims should not be construed as limiting the scope
of the claims.
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