Note: Descriptions are shown in the official language in which they were submitted.
CA 02738960 2011-05-02
SOL 2010/06/01 CA
APPLICANT
SOLON SE, Berlin
TITLE
SUPPORTING PLATE FOR MOUNTING SOLAR MODULES ON A FLAT
SUBSTRATE AND SUPPORTING PLATE PANEL
DESCRIPTION
The invention relates to a supporting plate, which is
used for mounting solar modules on a flat substrate,
with at least three parallel trapezoidal profiles which
are spaced evenly to one another and in each case run
continuously along the two side edges and centrally on
the plate from the front edge of the supporting plate
to the rear edge, all four edges enclosing a
rectangular area, and to a supporting plate panel with
at least two adjacently arranged supporting plates.
Due to the increasing prevalence of electricity-
generating photovoltaic systems, flat substrates, for
example in the form of flat roofs with an incline in a
range of up to 5 , are also increasingly covered. In
this case, particularly the weight of the photovoltaic
system applied plays a decisive role, as flat roofs
cannot be loaded to any desired extent. An essential
constituent of a photovoltaic system is the mounting
which comprises a large part of the total weight. In
order to save weight here, compact lightweight
supporting constructions are increasingly used for
mounting solar modules.
PRIOR ART
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A moulded block is known from DE 33 46077 C2, which has
two triangular side walls with rectangular cross
section on a base plate, so that a solar module can be
mounted in an inclined position. The moulded brick is
open to the front and rear. A plurality of moulded
blocks can be positioned in a row, without being
connected to one another in the process. For
impenetrable installation on a flat roof, the moulded
block consists of a heavy material (concrete).
A supporting tray made from plastic, the rear wall of
which is higher that the front wall, is for example
known from DE 698 15 168 T2. A peripheral edge running
in an inclined manner and onto which a solar module can
be mounted results. The supporting tray can be combined
with further supporting trays to form a row. For
impenetrable installation on a flat roof, the
supporting tray can be weighted down with concrete
elements. A similar supporting tray, which is closed
and can be filled with a fluid weighting product, is
known from DE 10 2005 033 545 Al.
It is known from US 2009/0320907 Al to support the
frame of a solar module on one side with rectangular
supporting arms, in order to achieve an inclining of
the solar module. These supporting arms have connecting
means, in order to be connected to the frames of
further solar modules in rows and in columns, so that a
solar module panel results. The individual solar
modules with frames and supporting arms can be stacked
for storage one above the other. Furthermore, wind
deflectors can be provided between the supporting arms.
In the corresponding US 2009/0320904 Al, a weighting
tank between the supporting arms is additionally
described.
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A supporting plate with four corner posts made from
concrete is known from DE 203 18 915 U1, on which
supporting plate a solar module can be mounted in the
fashion of an inverted table. In this case, all posts
are equally long, so that inclined mounting does not
result. A supporting plate which can be stacked for
storage purposes is known from EP 2 040 014 A2, which
has at least two mounting projections on a base plate,
the rear projection being higher than the front
projection, so that there is an incline for a mounted
solar module. Open cavities are located between the
mounting projections. For impenetrable mounting on a
flat roof, the supporting plate can be weighted down in
front of and behind the projections with stones. In
this case, a plurality of supporting plates can be
arranged next to one another in a row, the side edges
of which supporting plates are placed onto a connecting
element. Furthermore, a wind deflector can be provided
between the projections.
It is furthermore known from DE 20 2004 019 681 Ul to
rivet solar modules directly onto the trapezoidal
profiles of a flat roof in rows and columns. The
closest prior art to the invention is described in DE
2007 040 735 Al, however. A rectangular supporting
plate for mounting a plurality of solar modules on a
flat substrate is disclosed, which consists of three
trapezoidal profiles spaced evenly to one another,
which run continuously along the two side edges and in
the centre of the plate, from the front edge of the
supporting plate to the rear edge. In this case, all
three trapezoidal profiles are of consistently even
height and closely adjacent to one another, as is known
from a commercially available trapezoidal profile plate
which can be obtained commercially as preassembled
mass-produced goods. This can be up to 3 m wide and 10
m long, so that each trapezoidal profile plate is used
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for the mounting of a plurality of solar modules in
rows and columns. The upper sides of the trapezoidal
profiles take up almost the entire rectangular area of
the trapezoidal profile plate and carry securing
elements which form the bearing surface for the solar
modules. The intermediate spaces between the
trapezoidal profiles are very narrow on account of the
close adjacency and are used for mounting on
transversely running elevation elements of the same
height which lie in an impenetrable manner on the flat
substrate. An inclined mounting of the solar modules
results only by means of inclining of the flat
substrate. Together with the elevation elements and the
securing elements, the trapezoidal profiles form a
lightweight grid structure, a peripheral frame with
hold-down devices being provided for its securing.
OBJECT
Starting from the previously mentioned closest prior
art, the object for the present invention is to be seen
in the specification of a generic supporting plate
which can be handled particularly simply whilst
retaining its lightweight properties and does not
require any additional elevation or securing elements
for the solar modules. Furthermore, the supporting
plate according to the invention should also enable an
inclined mounting of the solar modules on a horizontal
flat substrate. All requirements should also apply for
a panel made up of a plurality of supporting plates.
The solution according to the invention is to be drawn
from the main claim. Advantageous developments of the
supporting plate according to the invention are to be
drawn from the subclaims. The co-ordinate claims show
advantageous combinations of the supporting plate
according to the invention in a supporting plate panel.
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All claims are explained generally in more detail below
in connection with the invention.
The supporting plate according to the invention is
fundamentally characterised with respect to the closest
known supporting plate in that it has a dimensioning of
the rectangular area in the region of the rectangular
area of an individual rectangular flat solar module to
be mounted. Thus, the supporting plate becomes
particularly simple to handle. Furthermore, it is
characteristic for the supporting plate according to
the invention that the upper sides of the trapezoidal
profiles are constructed as direct bearing surface for
the solar module to be mounted on the supporting plate
and the intermediate spaces between the trapezoidal
profiles are constructed as direct stand area for the
supporting plate on the flat substrate. Further planes
for elevating the supporting plate on the substrate and
for mounting the solar modules on the supporting plate
with the aid of securing elements, as are required in
the known supporting plate, are dispensed with in the
supporting plate according to the invention.
Furthermore, the supporting plate according to the
invention has a stand area which is twice to three-
times as large as the bearing surface and at the same
time is used as accommodating area for a fixed
weighting product. Here, the known supporting plate
only shows quite narrow webs between the trapezoidal
profiles, which cannot be weighted down and also cannot
be used as a secure stand area. Finally, the supporting
plate according to the invention is characterised in
that the height of the trapezoidal profiles increases
continuously from the front edge to the rear edge. By
this measure, a simple yet effective incline of the
bearing surface for the solar module is achieved, so
that this can be directed optimally towards the
incident sunlight during operation.
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Different constructions of the surfaces in the bearing
surface and the intermediate spaces in the stand area
result due to the increasing height of the trapezoidal
profiles. If the surfaces and intermediate spaces are
likewise rectangular, then the side walls of the
trapezoidal profiles have a curved course. Side areas
which run in a planar fashion are more advantageous,
however. Thus, a bearing surface made up of rectangular
upper sides and a stand area made up of trapezoidal
intermediate spaces can preferably be used in the
invention. Alternatively, a configuration of the
bearing surface made up of trapezoidal upper sides and
the stand area made up of rectangular intermediate
spaces is also advantageously possible. Constructions
of this type can be produced particularly simply by
means of deep drawing or canting methods. It is also
particularly advantageous if the supporting plate
according to the invention can be stacked. To this end,
the side areas of all trapezoidal profiles present
preferably have an oblique course. In accordance with
the example of the preassembled simple trapezoidal
profile plates, the supporting plates according to the
invention can then simply be stacked and stored above
one another. A construction made from a lightweight and
weatherproof plastic is particularly suitable in this
case. A further improved handleability of the
individual supporting plates results if handhold
cutouts are provided in the outer side areas of the two
outer trapezoidal profiles along the two side edges of
the supporting plate. In the layout of the individual
supporting plates, spacings in the region of the
bearing surface result due to the oblique side areas of
the outer trapezoidal profiles as well, however, which
spacings can also be bridged simply however It is more
beneficial however, if the outer side areas of the two
outer trapezoidal profiles preferably run vertically
along the two side edges of the supporting plate. As a
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result, although the stackability is somewhat less
beneficial, the upper sides of the outer trapezoidal
profiles of adjacent supporting plates form a mutually
adjacent bearing surface. The solar modules, which with
their side edges are terminated with the supporting
plates, can as a result be laid out in a practical
gapless manner in columns next to one another, which
enables an optimal utilisation of the substrate area.
At the rear edge, the trapezoidal profiles are higher
than at the front edge of the supporting plate, due to
the continuous rise according to the invention. The
large rear head area of the trapezoidal profiles can in
this case be constructed orthogonally to the stand area
of the supporting plate. If appropriate, undesirable
surfaces exposed to the wind result due to this,
however. In addition, the solar modules can be mounted
so densely in rows one behind the other that they
mutually shade one another, if appropriate. Preferably,
the supporting plate according to the invention is
therefore characterised by an oblique construction,
inclined towards the supporting plate, of the head
areas of the trapezoidal profiles at the rear edge of
the supporting plate. These inclined areas offer the
wind smaller areas of action and increase the spacing
between the individual solar module rows, so that these
cannot mutually shade one another. The head areas lie
in the region of the trapezoidal profiles.
Advantageously, the intermediate spaces forming the
stand area can also form a terminal wall with a height
of the trapezoidal profiles along the rear edge of the
supporting plate at least in the region of the
trapezoidal profiles. A closed space which can be
filled with a weighting product results. Analogously to
the head areas of the trapezoidal profiles, the
terminal wall can preferably also be constructed
obliquely. For good airing of the supporting plates for
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heat dissipation and improved adhesion, ventilation
openings can preferably be provided in the terminal
wall. So that water present on the flat substrate flows
away well in the region of the supporting plates, a
drainage grid can advantageously be provided along the
rear edge of the supporting plate, at least in the
region of the stand surface between the trapezoidal
profiles. Particularly preferred in the supporting
plate according to the invention however is a
continuous terminal wall with a continuous drainage
grid, as a combination of this type can be produced
particularly simply. The rear head areas of the
trapezoidal profiles are in this case simply integrated
into the terminal wall. An opening is however
advantageously provided in the terminal wall in the
region of the head area of an outer trapezoidal
profile. The connection socket of the solar module can
for example be arranged under this side trapezoidal
profile, which connection socket is easily reachable
through the opening - even for the connection cable.
The upper sides of the trapezoidal profiles together
form the direct bearing surface for the solar module.
Fixing can for example take place by means of a single
adhesive bonding. It is advantageous in this case if a
longitudinal profile is provided in the upper sides of
the trapezoidal profiles. Without reducing the actual
supporting area, an improved unmounting by dissolving
the bond of the solar module is enabled by the reduced
bearing surface. An oblique terminal wall can, as
detailed previously, preferably be provided at the rear
edge of the supporting plates, which terminal wall
ensures an increased spacing of the individual rows of
the solar modules. An optimal spacing between the
individual solar module rows results, however, if
additionally a continuous catwalk is also provided
along the front side of the supporting plate. As a
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result of this configuration, an optimal reachability
of the solar modules is also enabled. Installers can
pass between the individual rows and do not have to
move on the solar modules themselves, as is often known
from the prior art. Preferably, the catwalk can be
constructed in a grid-like manner, so that, in spite of
good surety of footing, it lets draining water through
easily and does not comprise much weight, which is
particularly advantageous if the catwalk is constructed
integrally with the supporting plate. The terminal wall
as well can readily be included into the integrality.
The supporting plates according to the invention can be
laid in a plurality of rows one behind the other, in
this case, the supporting plates can simply be pushed
against one another, so that they can also be removed
or displaced individually at any time. For the overall
stability of the solar module panel - also with respect
to acting wind loads - it is also advantageous however,
if connecting pieces are provided at the rear edge of
the supporting plate and connecting bolts are provided
at the front edge of the supporting plate or the
catwalk, so that a plurality of supporting plates can
be connected behind one another in columns. The
connecting pieces can have angled slots, into which the
connecting bolts can be clicked. Preferably, two
connecting pieces can be provided in each case as
extension of the outer side area of the two outer
trapezoidal profiles. The associated two connecting
bolts are then arranged in each case at the outer side
areas of the two outer trapezoidal profiles. They can
also be integrated into the side walls of the catwalk.
For connecting the supporting plates in the rows,
further connecting elements can furthermore preferably
be provided in the region of the outer side areas of
the two outer trapezoidal profiles. In this case, the
further connecting elements can preferably be
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constructed in the form of a rail with a dovetail
guide. Furthermore, a front further connecting element
in the region of the front edge of the supporting plate
or the catwalk and a rear further connecting element in
the region of the rear edge of the supporting plate can
be provided.
It has already been detailed many times that an entire
supporting plate panel made up of a multiplicity of
supporting plates arranged next to one another in rows
and columns and for mounting a corresponding number of
solar modules can advantageously also be formed with
the supporting plate according to the invention for
mounting a solar module. In order to achieve a good
securing of this supporting plate panel against acting
wind loads, the stand areas of the supporting plates
can preferably be weighted down with coarse-grained
gravel as applied weighting product. Other solid
weighting products, also in the form of large regular
stones, can naturally likewise readily be introduced.
The supporting plates according to the invention have
oblique trapezoidal profiles, on which the solar
modules can be mounted in an inclined manner.
Advantageously, all supporting plates in the supporting
plate panel can therefore also have an orientation of
the inclined bearing surfaces of the supporting plates
towards sunlight incident during operation. It has
likewise already been detailed that the individual
supporting plates advantageously can be connected to
one another in the individual rows and columns in a
different manner. If, for the connection of the
supporting plates in the rows, one is concerned with
rails with a dovetail guide, sliding elements with a
bilateral dovetail profile can advantageously be used,
which are pushed into the dovetail profiles of the
rails with dovetail guide between adjacent supporting
plates. It has also already been detailed that the
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solar module can preferably easily be adhesively bonded
onto the bearing surface of the supporting plate.
Particularly preferably, for a supporting plate panel,
frameless solar panels can therefore be applied as
solar modules onto the bearing surfaces of the
supporting plates by means of bonding. A particularly
lightweight construction results from the lightweight
supporting plates in connection with the lightweight
solar panels, which lightweight construction can be
arranged on smaller supporting flat substrates. Lifting
off due to wind loads can be avoided easily by means of
a corresponding weighting with a weighting product, so
that an impenetrable laying of the supporting plates
onto the flat substrate is possible. Especially in the
case of flat substrates, the damage-free state of the
roof skin is of particular importance for ensuring the
water-tightness. In an individual case - in the event
of particularly large acting wind loads - a tensioning
of the supporting plate panel, for example by means of
diagonal tensioning cables at at least two points can
however also take place.
The modifications of the supporting plate according to
the invention mentioned can be used both alone and in
any desired combinations with one another in the
invention. Further modifications are likewise readily
possible. Further exemplary constructive configurations
are to be drawn from the following special part of the
description.
EXEMPLARY EMBODIMENT
Preferred embodiments of the supporting plate for
mounting solar modules on a flat substrate according to
the invention are described in more detail hereinafter,
on the basis of the schematic figures. In the figures,
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FIGURE 1 shows a perspective view of the supporting
plate,
FIGURES 2A, B, C show various embodiments of the
trapezoidal profiles,
FIGURE 3 shows a front view of the supporting plate
according to Fig. 1 from above,
FIGURE 4 shows a front view of the supporting plate
according to Fig. 1 from behind,
FIGURE 5 shows a front view of the supporting plate
according to Fig. 1 from the front,
FIGURE 6A shows a front view of the supporting plate
according to Fig. 1 from the right,
FIGURE 6B shows a front view of the supporting plate
according to Fig. 1 from the left and
FIGURE 7 shows a supporting plate panel made up of a
plurality of supporting plates according to Fig. 1.
In FIGURE 1, a rectangular supporting plate 01
according to the invention for mounting solar modules
on a flat substrate is illustrated in perspective top
view. The supporting plate 01 is delimited at its two
side edges 02, 03 by two outer trapezoidal profiles 04,
05. A central trapezoidal profile 06 runs in the centre
of the supporting plate 01. All trapezoidal profiles
04, 05, 06 run parallel to one another and continuously
from the front edge 07 of the supporting plate 01 to
the rear edge 08, all four edges 02, 03, 07, 08
enclosing a rectangular area 09. In this case, this
rectangular area 09 is approximately as large as an
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individual flat solar module to be mounted (cf. FIGURE
7).
In the exemplary embodiment, three trapezoidal profiles
04, 05, 06 are illustrated. These are distributed
evenly on the supporting plate 01. Thus, the number of
required trapezoidal profiles 04, 05, 06 results as a
function of the size of the solar module to be mounted
and thus of the size of the rectangular area 09. The
outer trapezoidal profiles 04, 05 are always present.
Therebetween, depending on the size of the rectangular
area 09, only one trapezoidal profile (central
trapezoidal profile 06) or also a plurality of
trapezoidal profiles may be arranged. For example, a
further trapezoidal profile can be provided between the
central trapezoidal profile 06 and the two outer
trapezoidal profiles 04, 05 in each case, so that there
are five trapezoidal profiles in total on the
supporting plate 01. Other numbers are likewise
realisable, the area ratios needing to be taken into
account as a function of the size of the rectangular
area 09, however, (see below).
All upper sides 10 of the trapezoidal profiles 04, 05,
06 form a direct bearing surface 11 for the solar
module to be mounted on the supporting plate 01. All
intermediate spaces 12 between the trapezoidal profiles
04, 05, 06 form a direct stand area 13 for the
supporting plate 01 on the flat substrate, for example
a flat roof inclined up to 5 . In this case, however,
the stand area 13 is twice to three-times as large as
the bearing surface 11. At the same time, the stand
area 13 is also used as accommodating region 39 for a
solid weighting product. All trapezoidal profiles 04,
05, 06 show a continuous increase in their height h in
their course from the front edge 07 to the rear edge 08
of the supporting plate (hl h2), so that an incline
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of the bearing surface at an angle of incline a
results.
The FIGURES 2A and 2B show possible forms of the upper
sides 10 of the trapezoidal profiles 04, 05, 06 and the
intermediate spaces 12 in detail. In the FIGURE 2A, the
upper sides 10 have a trapezoidal shape and the
intermediate spaces 12 have a rectangular shape. In the
FIGURE 2B, things are reversed: the upper sides 10 have
a rectangular shape and the intermediate spaces 12 have
a trapezoidal shape. In both cases, a trapezoidal yet
even planar shape results for the side areas 14 of the
trapezoidal profiles 06. These configurations are
particularly good for a stackability of the supporting
plate 01 during product storage. In this case, the
supporting plate 01 can preferably be produced from a
plastic. For the case, which is not shown, of a
rectangular shape of upper sides 10 and intermediate
spaces 12, the side areas 14 have a curved trapezoidal
course. In FIGURE 2C, another outer trapezoidal profile
05 is illustrated, in which the outer side area 15 is
constructed vertically, so that the outer trapezoidal
profiles 04 of adjacent supporting plates 01 can adjoin
gaplessly. The construction of vertical side areas 15,
16 is also implemented in the case of the supporting
plate 01 according to FIGURE 1 along the side edges 02
and 03.
An oblique construction inclined towards the supporting
plate 01 of head areas 17 of the trapezoidal profiles
04, 05, 06 at the rear edge 08 of the supporting plate
01 is furthermore illustrated in FIGURE 1. A terminal
wall 42 with the height h2 of the trapezoidal profiles
04, 05, 06 is arranged in the region of the
intermediate spaces 12, which terminal wall has the
same incline as the head areas 17 of the trapezoidal
profiles 04, 05, 06. In the outer side area 16 of the
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outer trapezoidal profile 05, a handhold cutout 18 is
furthermore illustrated, which facilitates the laying
of the supporting plate 01 onto the flat substrate. The
outer side area 15 of the outer trapezoidal profile 04
likewise has a handhold cutout 18 of this type.
Furthermore, longitudinal profiles 19, which facilitate
an adhesive bonding of the solar modules, are
illustrated in the upper sides 10 of the trapezoidal
profiles 04, 05, 06. A drainage grid 40 along the rear
edge 08 of the supporting plate 01 in the region of the
stand area 13 between the trapezoidal profiles 04, 05,
06 is likewise to be seen. The drainage grid 40 is used
for the throughflow of water on the flat substrate.
Furthermore, the terminal wall 42 has airing openings
20 which are used for dissipation of heat below the
supporting plates 01 by means of air circulation and
the reduction of surfaces exposed to the wind. The
drainage grid 40 can likewise be used for the airing
and ventilation as an airing opening 20. Finally, at
the front edge 07 of the supporting plate 01, a grid-
like catwalk 21 is shown, on which installers can walk
between the individual solar module rows.
Furthermore, FIGURE 1 shows connecting pieces 22 at the
rear edge 08 of the supporting plate 01 which are
arranged as an extension of the outer side areas 14, 15
of the two outer trapezoidal profiles 04, 05. In
addition, connecting bolts 23 are located at the front
edge 24 of the catwalk 21, which are integrated in side
walls 25, 26 of extensions 27, 28 of the two outer
trapezoidal profiles 04, 05. Due to the engagement of
the connecting bolts 23 into the connecting pieces 22,
the supporting plates 01 can be connected column-by-
column securely, yet releasably, one behind the other.
Openings 29 in the outer side areas 14, 15 of the outer
trapezoidal profiles 04, 05 are likewise to be seen.
These are used for the accommodation of further
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connecting elements (not shown) for connection of the
supporting plates 01 row-by-row next to one another.
For example, this may concern one- or multiple-piece
rails with dovetail guides, which are connected to one
another by a common slide element (cf. also FIGURE 7
and DE 10 2006 044 418 B3 or DE 10 2010 014 414.2, not
yet published at the time of the application).
The FIGURES 3, 4, 5, and 6A, B show the supporting
plate 01 according to FIGURE 1 in the corresponding
front views (FIGURE 3 from above, FIGURE 4 from the
rear, FIGURE 5 from the front, FIGURE 6A from the
right, FIGURE 6B from the left). The explanations of
the reference numbers shown are to be drawn in
accordance with FIGURE 1. In addition, the FIGURE 4
shows a further opening 30 in the head area 17 of the
outer trapezoidal profile 05 of the supporting plate
01. A connection socket (not illustrated in any more
detail) can be operated through this opening 30, which
connection socket can be connected to the solar module
via a further opening 31. In the FIGURE 4, the terminal
wall 42 is not illustrated continuously. The airing
openings 20 are to be seen here. These are conceived in
such a manner that the air flowing out is conducted
away upwardly (cf. FIGURES 6A, B).
The FIGURE 7 finally shows a supporting plate panel 32
made up of a multiplicity of individual supporting
plates 01. A fixed weighting product 33 in the form of
coarse-grained gravel applied onto the stand areas 12
of the supporting plates 01 is to be seen. An
orientation of the inclined bearing surfaces 11 of the
supporting plates 01 towards the incident direction 34
of sunlight incident during operation is furthermore
shown. Sliding elements 35 with a bilateral dovetail
profile, which are pushed into the dovetail profiles of
rails 36 with dovetail guide as further connecting
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elements 43 between adjacent supporting plates 01, are
likewise indicated (specifically in a detailed
section). Applied by means of bonding onto the bearing
surfaces 11 were frameless solar panels 37 as solar
modules 41. The entire supporting plate panel 32 is
laid on a flat substrate 38 in an impenetrable manner
and fixed by the weighting product 33 and therefore
easily secured against being lifted off by means of
acting wind loads.
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LIST OF REFERENCE SYMBOLS
01 Supporting plate
02 Left side edge of 01
03 Right side edge of 01
04 Left outer trapezoidal profile
05 Right outer trapezoidal profile
06 Central trapezoidal profile
07 Front edge of 01
08 Rear edge of 01
09 Rectangular area
Upper side of 04, 05, 06
11 Inclined direct bearing surface made up of 10
12 Intermediate space between 04, 05, 06
13 Direct stand area made up of 12
14 Side area (oblique) of 04, 05, 06
Outer side area (vertical) of 04
16 Outer side area (vertical) of 05
17 Head area of 04, 05, 06
18 Handhold cutout in 15, 16
19 Longitudinal profile in 10
Airing opening
21 Catwalk
22 Connecting piece
23 Connecting bolts
24 Front edge of 21
Outer side wall of 27
26 Outer side wall of 28
27 Extension of 04
28 Extension of 05
29 Opening
Opening
31 Opening
32 Supporting plate panel
33 Fixed weighting product
34 Incident direction
Sliding element
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36 Rail
37 Frameless solar panel
38 Flat substrate
39 Accommodating region
40 Drainage grid
41 Solar module
42 Terminal wall
43 Further connecting element
h Height of 04, 05, 06
hl Height of 04, 05, 06 at 07
h2 Height of 04, 05, 06 at 08
a Angle of incline (hl -> h2)
