|Title of Invention||
PYLON OF A WIND POWER INSATALLATION
|Abstract||A pylon for a wind power installation comprising mutually superposed segments (4, 6) and bonding material between the superposed segments, is characterised in that a heating element (5) provided in the upper region of the downwardly disposed segment and/or in the lower region of the upwardly disposed segment (6) on the side of the segment, which is towards the oppositely disposed segment.|
|Full Text||Pylon of a wind power installation
There are various pylons of wind power installations, primarily lattice
mast pylons, tubular steel pylons or concrete pylons. In the case of pylons
of concrete, there are various possible ways of producing same, inter alia
also erecting pylons from ready-made reinforced concrete parts, wherein
the individual ready-made reinforced concrete parts form respective
segments which are laid one upon the other and which are then braced to
each other. A process for producing a pylon from ready-made reinforced
concrete parts is known for example from DE 100 33 845.3 (not yet
published at the filing date of the present application).
In the case of such pylons of concrete segments, the individual
segments (in practice each segment is of a different shape) are not only
simply laid one upon the other, but they are also connected to each other
by way of a suitable bonding material. Those bonding materials can be a
polymer (for example epoxy resin) and the layer thickness of the bonding
material is usually at least 2 mm.
When now such a segment-type pylon is produced, the procedure,
after positioning a segment, involves applying to the top side of the
segment the bonding material which then in turn can harden after the next
segment has been laid in place. That in turn is followed by application of
bonding material to the freshly laid segment, and so forth.
Under some circumstances however a problem can arise with the
bonding material when the pylon is erected at a cold time of the year. More
specifically, the bonding material usually requires a minimum temperature
for it to harden and, if the outside temperature is low, for example around
0°C, either the bonding material does :.ot harden or hardening takes a very
long period of time, which considerably delays total erection of the pylon.
The object of the in ention is to speed up construction of a pylon
comprising segments dispased in mutually superposed relationship, with a
bonding material between the segments.
In accordance with the invention that object is attained by a pylon which
comprises mutually superposed segments, there being a bonding material
between the mutually superposed segments, characterised in that a heating
element is provided in the upper region of the downwardly disposed segment
and/or in the lower region of the upwardly disposed segment on the side of the
segment, which is towards the oppositely disposed segment.
The heating element preferbly comprises a heating wire or a positive
temperature coefficient (PTC) resistance wire which is arranged on the top side
of the segment or below the top side in the segment itself.
The heating wire or the PTC resistance wire may be a wire through which
current flows for heating thereof.
The heating wire is preferably laid in a meander configuration at the top
side of the segment or in the lower region within the segment
To heat the heating wire, current connecting terminal may be provided, to
which for example a welding transformer or another current -generating device
can be connected.
In accordance with the invention, at least one side of segments which are
disposed in mutually superposed relationship is provided with a heating module
and said heating module preferably comprises a simple heating wire, a positive
temperature coefficient (PTC) resistance wire or also steel wire (welding wire).
If a high current, for example in the range of 70 to 150 A, flows through
such a wire, then the wire heats up and the bonding material applied to the top
side of the segment can harden quickly in the desired manner, in spite of cold
To achieve a good heating erect, it is advantageous if the heating module
is provided over the entire surface area within the upper region of a concrete
segment in order to achieve maximum possible transmission of heat to the
That great heating effect can also be achieved for example if a heating
wire is arranged in a meander configuration within the upper region in the
concrete of the pylon segment and, of that heating wire, then only the two
connecting terminals are still accessible. It is then possible to connect to those
connecting terminals for example a conventional welding transformer which is
capable of passing a high current through wire, so that then the desired heating
effect in relation to the upper reaction of the segment and therewith also the
bonding material occurs.
The invention is illustrated hereinafter with reference to the accompanying
drawing in which :
Figure 1 shows a view on to a pylon segment according to the invention,
Figure 2 shows a measurement curve in respect of various measurement
points and the air of a pylon segment according to the invention,
Figure 3 shows an illustration of the manner of laying a heating wire in the
pylon segment when segments are disposed in mutually superposed
Figure 4 shows a view of a pylon, consisting of pylon segments, of a
wind power installation.
Figure 1 shows a round pylon segment 4 (viewing from above) with a
portion removed from the surface of a pylon segment. It is to be seen in
this respect that a heating module 1 is let into the upper region 2 of the
pylon segment, the heating module comprising a heating wire 5 which is
disposed in a meander configuration within the concrete segment 4. It is
also possible to see two connecting terminals 6a, 6b for the heating wire 5,
to which it is possible to connect for example a welding transformer which
generates a high current which can be passed through the heating wire 5
so that the heating wire 5 is heated and then also provides for heating the
concrete in the uppermost region of the segment so that the bonding
material on the segment can harden,
Figure 3 shows an illustration of segments which are laid in mutually
superposed relationship. Illustrated here are two segments 4, 6 which are
arranged in mutually superp sed relationship and of which the lower
segment 4 is interrupted in the region of a reinforced concrete arrangement
(which is not of particular significance here). It is also possible to see there
the heating wire 5 which is laid in the upper region of the pylon segment.
The segments 4 and 6 are arranged in mutually superposed relationship in
such a way that casing tubes 7 of a tensioning device in the segments 4, 6
are disposed in substantially aligned mutually opposite relationship. The
tensioning device 8 is let into the lower segment 4 in positively locking
relationship and the upper edge of the peripherally extending rim
terminates flush with the surface of the segment 4. The tubular portion 12
engages into the casing tube 7 which is integrated in the segment 4.
A seal 20 is fitted in the part of the device 8, which is provided to
receive the seal 20, and the seal bears with its top side firmly against the
lower segment 6.
When erecting the pylon comprising the segments 4, 6, firstly
preferably three spacers 32 are arranged distributed at approximately
equal spacings around the perphery on the upwardly facing surfaces of the
segment 4 which was fitted, being the lower segment.
The spacers 32 are preferably of wood and are of a height of about 5
mm (depending on the surface roughness of the segments), which
corresponds to the intended spacing 30 between the segments 4, 6 after
assembly. The modulus of elasticity of wood is in a range which on the one
hand makes it possible for wood to be able to withstand for some time the
forces which occur in the pylon, but which on the other hand provides that
irregularities and unevenness in the mutually opposite surfaces of the
segments 4, 6 are pressed into the wood and thus flaking-off or chipping-
off phenomena on the segments 4, 6 are avoided.
In that respect, levelling of the segments 4, 6 can be achieved by
suitable selection of the height of the spacers 32 (the spacing may also be
approximately only 2 mm in accordance with the inevitable production
inaccuracies of the segments 4, 6.
Before the operation of laying the upper segment 6 and the lower
segment 4, a bonding material 34 is applied to the upper surface of the
segment 4 to cover the area thereof. In that respect the positions at which
the casing tubes 7, 8 in the segments 4, 6 and the casing tube 7 in the
upper segment 6 and the device 8 with the seal 20 in the lower segment 4
are in mutually opposite relationship are left clear upon applying the
bonding material 34, insofar as the bonding material 34 can be applied as
far as the projection 23.
The bonding material 34 which is applied to cover the surface area is
preferably an epoxy resin (or another polymer) and is applied at least in a
layer thickness of about 2 to 6 mm which substantially corresponds to the
intended spacing 30 between the segments 4 and 6.
When such a pylon is constructed at the cold time of year, where the
temperature is not infrequently below the freezing point for the entire day
(also because wind power installations are also erected at very unprotected
positions), the epoxy resin normally, if at all, only very slowly,
which overall greatly slows down the procedure involved in erecting the
pylon, because further positioning of further segments also presupposes
hardening of the epoxy resin between the lower segments which have
already been positioned.
In the case of the pylon according to the invention the pylon
construction team can then activate the heating modules or heating means
already provided in the segments, by for example a welding transformer
being connected to the heating wire by way of the connecting terminals 6a,
6b. The welding current is in a range of 60 to 150 A (or below that or above
it). The segment 4 now heats up at its top side, and the bonding material
also, and the bonding material can harden as desired within a short time.
As the provision of a heating module in the form of a normal steel
wire or heating wire or welding wire is very convenient and inexpensive, it
can remain in the concrete of the segment even after the pylon has
hardened. In any case a pylon segment includes a plurality of steel
bracings in order to increase its strength.
In order to avoid the heating wire 5 coming into contact with other
electrically conducting parts in the segment, it may also be appropriate if
the heating wire 5 is provided with a heat-conducting but electrically
insulating layer. Such insulation however should be resistant in respect of
shape and heat at temperatures of up to 60 to 100°C.
Figure 2 shows the temperature characteristic of an embodiment of
the invention. It can be seen in this respect how the outside temperature
curve firstly drops to a range of about -12 to -15°C.
Above the temperature curve there are the curves K1, K2 and K3,
wherein Kl is the temperature of the heating line (heating module, heating
wire), K2 is the temperature ir a concrete corner and K3 is the temperature
at the concrete centre (surface of the segment). As can be seen, as soon as
a current of about 80 to 90 A flows through the heating wire 5, the
temperature rises almost linearly and the temperature of the concrete also
rises with the temperature of the heating wire, delayed by a short time. In
that way the bonding material, in the specific case therefore the epoxy
resin, can rapidly harden and the of laying down further
segments can progress quickly.
It will be appreciated that it is also possible for the heating wire to be
provided not only in the uppermost region of the lower segment but in
addition also in the lower region of the upper segment 6 so that still more
heat can be applied to the bonding material, which further accelerates
The variant according to the invention, for heating a segment, has
the advantage that it is highly favourable, and finally the costs of the
normal steel wire which is used as the heating wire are in the region of a
few hundredths of a German mark per metre.
The operation of laying such a heating wire is also very
uncomplicated and can be quickly finished in production of the segment.
Therefore, there is also no disadvantage if the heating wire remains
in the segment itself, even if the heating wire is not used at all because the
pylon is erected in warm temperatures.
When the heating wire is provided however it is also possible to erect
the pylons of wind power installations even at the cold time of the year and
thus irrespective of the weather and the season.
It will be appreciated that the heating wire may be laid not only for
example in a meander configuration but in any other form, even in such a
way that the heating wire itself assumes the shape of a circle.
Figure 4 shows a law of a pylon comprising pylon segments
according to the invention which are placed one upon the other and which
are braced relative to each other by means of a bracing device (not
1. A pylon for a wind power installation, wherein the pylon comprises
mutually superposed segments (4, 6) and there is a bonding material between
the mutually superposed segments, characterised in that a heating element (5)
is provided in the upper region of the downwardly disposed segment and/or in
the lower region of the upwardly disposed segment (6) on the side of the
segment, which is towards the oppositely disposed segment.
2. A pylon as claimed in claim 1 wherein the heating element comprises a
heating wire (5) or a positive temperature coefficient (PTC) resistance wire which
is arranged on the top side of the segment or below the top side in the segment
3. A pylon as claimed in claim 2 wherein the heating wire (5) or the PTC
resistance wire is a wire through which current flows for heating thereof.
4. A pylon as claimed any one of the preceding claims wherein the
heating wire (5) is laid in a configuration at the top side of the segment
or in the lower region within the segment (4).
5. A pylon as claimed in any one of the preceding claims wherein to heat the
heating wire (5) there is a current connecting terminal (6a, 6b) to which for
example a welding transformer or another current-generating device can be
6. A wind power installation incorporating a pylon as claimed in any one of
the preceding claims.
A pylon for a wind power installation comprising mutually superposed
segments (4, 6) and bonding material between the superposed segments, is
characterised in that a heating element (5) provided in the upper region of the
downwardly disposed segment and/or in the lower region of the upwardly
disposed segment (6) on the side of the segment, which is towards the
oppositely disposed segment.
|Indian Patent Application Number||741/KOLNP/2004|
|PG Journal Number||08/2010|
|Date of Filing||02-Jun-2004|
|Name of Patentee||WOBBEN ALOYS|
|Applicant Address||ARGESTRASSE 19, 26607 AURICH|
|PCT International Classification Number||F03D 11/04|
|PCT International Application Number||PCT/EP2002/13844|
|PCT International Filing date||2002-12-06|