[0001] The present invention relates to a truss construction comprising a first truss and
at least one further truss, wherein the trusses are fixed to each other via a coupling
part.
[0002] Truss systems are generally modular frame constructions which can be disassembled
and which are assembled from a number of truss parts, and which can extend in two
or three dimensions as required. Scaffolds, roofing constructions, support frames,
portals and other constructions can thus be realized which are used particularly for
stand construction and theatre construction, for instance as lighting ceilings, support
constructions and set constructions for concerts, fashion shows, presentations, trade
fair stands and the like, for instance for mounting thereon of pieces of scenery,
curtains, speakers, spotlights, stages and the like.
[0003] A truss construction normally comprises a number of trusses mutually coupled in series,
preferably by means of rapid-action couplings. Trusses are metal tube constructions
usually having a straight, triangular or square cross-section, which results in designations
such as ladder, triangle and square trusses. In a total construction such trusses
for instance form beams, rafters, pillars, corner pieces or coupling elements for
the purpose of modular construction therefrom of a desired setup or scaffold in accordance
with the specific requirement. In the great majority of cases aluminium is herein
chosen as material for the truss parts, due to the relatively low weight combined
with a relatively great mechanical strength and durability. The modular design together
with the comparatively rapid and simple assembly and disassembly make such truss systems
particularly suitable for temporary use during events, but can also provide a solution,
as the case arises, for constructions of a more permanent nature.
[0004] The manufacture of truss parts normally requires much manual work, wherein the component
parts are welded to each other at precisely predetermined positions. One part which
is particularly awkward in this respect is a coupling part which is normally employed
as a corner piece. This part is assembled from a number of tube elements and coupling
pieces and serves to mutually connect beams or rafters in different directions. The
relatively large amount of welding involved in the manufacture of such a coupling
part makes this part in particular relatively expensive. In order to be able to realize
any random corner construction, the designer of a truss construction must have at
his disposal all forms of such coupling parts, i.e. for instance for all right-angled
corners as well as coupling parts with two, three, four, five and six coupling points,
which must therefore all be held in stock in quantity, thus requiring a considerable
investment.
[0005] There is therefore a need for a coupling part to which coupling points can be added
modularly as required, so that the necessary working supply can be limited. The present
invention has for its object, among others, to provide a truss construction of the
type stated in the preamble with a coupling part which fulfills this need.
[0006] For this purpose a truss construction of the type stated in the preamble has the
feature according to the invention that the coupling part comprises a basic element
having on a first side connecting means for a manually releasable connection to a
first coupling element and on at least one further side connecting means for a manually
releasable connection to a further coupling element, that each coupling element comprises
on a side remote from the basic element coupling members for a releasable connection
to a truss, that the first truss is connected to the basic element via the first coupling
element and that the at least one further truss is connected to the basic element
via the at least one further coupling element. Instead of fixed coupling points, the
coupling part according to the invention thus has an adjustable number of coupling
points. The system builder hereby only needs to hold the basic parts and a sufficient
number of coupling elements in stock to be able to realize a wide range of corner
constructions. Starting with the basic element, a larger or smaller number of coupling
elements are connected thereto depending on the number of trusses which have to be
connected. The coupling element can be thus adapted to the specific situation as desired.
The coupling elements in turn carry coupling members with which the connection to
the trusses for connecting can be effected in reliable manner. A coupling element
can be omitted in directions where no truss has to be fixed, so that unused coupling
members, with the intrusive effect this usually has, can be avoided.
[0007] In a particular embodiment the truss construction according to the invention has
the feature that at least one of the fixed trusses has an at least substantially triangular
cross-section and that the basic element comprises the connecting means in at least
two at least substantially mutually orthogonal planes. In a modular manner this embodiment
creates a unique transition between triangular trusses in mutually orthogonal directions,
if desired in combination with other types of trusses, such as square and straight
ones. All manner of right-angled corners with one or more triangular trusses can thus
be realized owing to the above described flexibility and adjustability of the coupling
part.
[0008] In a further particular embodiment the truss construction according to the invention
has the feature that the basic element comprises the connecting means in six at least
substantially mutually orthogonal planes. In this case all possible right-angled connections
of trusses in three dimensions can be realized, wherein a coupling element is arranged
in the directions in which a connection must actually be made.
[0009] A further embodiment of the truss construction according to the invention has the
feature that the coupling elements comprise a number of tube parts forming a continuation
of the truss connected thereto, and that on a side directed toward the basic element
the tube parts are connected thereto by means of a threaded connection, and on a side
remote from the basic element they carry a coupling member. Because the coupling elements
form as it were a continuation of the trusses connected thereto, the mutual connection
can be achieved while retaining strength, rigidity and reliability, so that the final
construction is fully loadable. The mutual connection between coupling element and
basic element is a threaded connection and is realized beforehand using appropriate
tools. A further embodiment of the truss connection according to the invention has
in this respect the feature that the connecting means comprise bores in which an internal
thread is arranged to close-fittingly receive therein an external thread of a threaded
end extending from a coupling element.
[0010] A particular preferred embodiment of the truss construction according to the invention
is characterized in that the tube parts are mutually connected in a polygonal relation,
and particularly in that the relation of at least one of the coupling elements comprises
a triangular relation. By arranging the orthogonal relation in the coupling element
in a manner corresponding with the truss for connecting hereto, jigs and/or additional
tolerances and fine adjustments are unnecessary owing to the thus obtained dimensionally
stable and exact alignment.
[0011] Although the connection to the trusses can be realized in different ways, use is
preferably made of a releasable rapid-action coupling. A further preferred embodiment
of the truss construction according to the invention has in this respect the feature
that the coupling member comprises a hollow bush body open on at least one side, with
an at least partly conical inner surface on which a complementary outer surface of
a coupling body lies in fitting manner, that the bush body and the coupling body are
fixed in mutually releasable manner by means of a locking pin and that the coupling
body is firmly connected to a truss. Such a conical bush coupling is self-aligning
and can be embodied in clearance-free and rigid manner without great effort. In a
further embodiment the truss construction is characterized herein in that the trusses
are also provided on their outer end with coupling members in the form of a hollow
bush body open on at least one side with an at least partly conical inner surface
on which a complementary outer surface of a coupling body lies in fitting manner,
that the bush body and the coupling body are connected in mutually releasable yet
firm manner by means of a locking pin. In this case coupling part and truss take a
homomorphic form in respect of the coupling, and by interposing such a symmetrical
coupling body a clearance-free, rigid and, partly for this reason, exceptionally strong
connection can always be made. Simply arranging and removing the locking pin is sufficient
to fix and respectively release this connection.
[0012] In a further particular embodiment the truss construction according to the invention
has the feature that the basic element of the coupling part comprises a number of
tube parts which form the edges of an imaginary cube and which are mutually coupled
at corner points of the cube via a connecting piece, that at least on the first and
further side at least one additional connecting piece is arranged which forms an imaginary
triangle, at least in projection, with two diametrically opposite connecting pieces,
and that the connecting pieces comprise the connecting means. In this embodiment use
is made of a cube as the basic form for the basic element, which is assembled from
tubes and connecting pieces. The connecting pieces comprise connecting means for the
connecting elements. In order to also allow connection of triangular trusses, there
is added on at least one side of the basic element a connecting piece which comprises
connecting means at the position of the vertex of the triangular truss for coupling.
In a further particular embodiment this is an isosceles triangle, and more particularly
an equilateral triangle. In the latter case the additional connecting means are then
situated, assuming a basic element with edges of a length L, at the position
L. For the directions in which a triangular truss is desired, coupling elements are
connected to the basic element via these additional connecting means and the truss
in question is coupled to these coupling elements. Triangular trusses can thus be
connected from a cubic basic form, optionally in combination with square and straight
trusses.
[0013] In a further preferred embodiment the truss construction according to the invention
is characterized in that the basic element comprises a number of tube parts which
form the sides of an imaginary pyramid and are mutually coupled at corner points hereof
via a connecting piece, and that the connecting pieces comprise the connecting means.
By making use herein of a pyramidal structure of the basic element there is optimal
connection to the cross-section of triangular trusses which have to be mutually coupled.
In its basic form such a coupling part can mutually connect four trusses. A particular
embodiment of the truss construction has the feature herein that the pyramid has a
square base, in which case a square truss can be coupled on if desired on the base
side of the coupling part. In practice this could for instance be an upright in the
total truss construction, which thus imparts more strength to the whole than a comparably
dimensioned triangle truss in the same position. A square base moreover provides an
extra side in the structure of the basic element for connection of an additional truss.
A further particular embodiment of the truss construction according to the invention
has in this respect the feature that there is arranged at least practically halfway
along at least one of the sides of the base a first further connecting piece which,
at least in projection, forms a triangle with diametrically opposite connecting pieces
in the base. In this case a triangular or square truss can be coupled on as desired
on the base side, which makes the whole all the more flexible.
[0014] A very particular preferred embodiment of the truss construction according to the
invention is characterized in that, in a direction substantially transversely of the
base of the pyramid, a second further connecting piece is connected to the first further
connecting piece and that the second further connecting piece is arranged at least
practically at the same distance from the base as the connecting piece which forms
a vertex of the pyramid, and which, at least in projection, forms a triangle with
two diametrically opposite connecting pieces in the base of the pyramid. In this embodiment
the second further connecting piece provides a basis for further connecting means
so that an extra truss can be coupled on at the side of the basic element where this
second further connecting piece is arranged. Assuming a rectangular base, a total
of six connections is thus possible in orthogonal directions. The basic form of the
basic element herein remains a pyramid structure however, and thus fits in optimally
with the design of triangular trusses. This is not only a significant advantage from
a mechanical-physical viewpoint, but it also provides aesthetic advantages in that
the coupling part thus remains relatively slender and does not protrude, or hardly
so, in a construction of mainly or only triangular trusses. The slender construction
furthermore ensures a relatively low weight, which provides important ergonomic advantages.
[0015] The invention also relates to a coupling part, basic element and a coupling element
for application in the above described truss construction according to the invention,
and will now be further elucidated on the basis of a number of embodiments and an
associated drawing. In the drawing:
- figure 1
- shows a first embodiment of a truss construction according to the invention;
- figure 2
- shows a perspective view of a releasable rapid-action coupling applied in the truss
construction of the other figures;
- figure 3
- shows a second embodiment of a truss construction according to the invention; and
- figure 4
- shows a third embodiment of a truss construction according to the invention.
[0016] Corresponding parts are designated as far as possible in the figures with the same
reference numerals.
[0017] Figure 1 shows a truss construction according to a first embodiment of the invention.
The truss construction here comprises four triangular trusses 13 which are coupled
mutually and to a square truss 14 via a coupling part 20. The trusses each comprise
a number of parallel tubes 10 which typically have, depending on the desired loadability,
a diameter of 30-50 mm and between which a number of thinner bars 11 is welded to
give the desired rigidity, strength and shape-retention thereto. All components are
formed in this embodiment from aluminium, wherein for the hollow parts use is made
of a relatively thick wall of 1.5-4.0 mm to ensure sufficient strength and durability.
[0018] For the mutual coupling of the various truss parts, use is made in this embodiment,
as it is in the following, of a conical bush coupling which is further shown in figure
2 for the purpose of elucidation. The hollow tube parts 10 are provided on both sides
for this purpose with a coupling member 30 in the form of a hollow bush body with
an inner surface 31 running over a part of the length thereof. All other truss parts
are also provided with such coupling members in order to enable a mutual rapid-action
coupling which can be manually arranged and, if desired, released without special
tools.
[0019] In the cavity of the bush body a complementarily formed coupling body 32 is received
which lies close-fittingly therein. Coupling body 32 is symmetrical and has on both
sides the same conical progression adapted to the bush bodies 30 with their inner
surface 31. The orientation of coupling body 32 itself and the truss parts for connecting
is therefore not important for the connection to be made. Transversely of the longitudinal
direction of each of the bush bodies 30 and coupling body 32 a slightly conical bore
36 is arranged through both parts, in which bore a similarly slightly conical locking
pin 33 is received. This locking pin 33 fixes the whole and is self-tightening owing
to the conical progression thereof, so that a firm and clearance-free situation is
obtained. Locking pins 33 are in turn secured by a standard cotter pin 34 or nut 35.
[0020] The coupling body comprises a basic element 21 which is constructed from a number
of tube parts 22 which form the edges of an imaginary cube and which are mutually
coupled at the corner points thereof by coupling pieces 23. Coupling pieces 23 are
for the greater part solid, rectangular blocks having in each side surface a central
bore 25 with an internal screw thread in which is close-fittingly received a threaded
end of a screw bolt which extends freely rotatably from a tube part at an outer end
thereof. A blind threaded connection can thus be realized between a tube part and
coupling piece. Because the outer end of the screw bolt is provided with a socket,
torque or other engaging means, and is freely accessible via the bore in the coupling
piece, such a threaded connection can be firmly tightened on both sides.
[0021] The free bores 25 form connecting means for coupling elements 26 which can be arranged
on and released from the sides of the basic element as required in order to mutually
connect the desired number of trusses. In this embodiment the coupling elements 26
comprise coupling bushes which are screwed into bores 25 of coupling pieces 23 in
the above described manner by means of a screw bolt. On their free end the coupling
bushes 26 bear a coupling member adapted to the conical rapid-action coupling which
has been further elucidated above with reference to figure 2. A coupling body is received
herein and fixed with a locking pin.
[0022] So as to also enable coupling of triangular trusses, extra coupling pieces 24 which
extend slightly inward are added to the side surfaces of basic element 21. In addition
to a number of bores 25 for fixing the adjacent tube parts in the above stated manner,
these coupling pieces 24 also comprise a bore 25 at the position of a vertex of the
triangular truss for connecting. In this case, assuming an equilateral triangle truss
with sides L, typically in the order of 300-600 mm, and a cube-shaped basic element
21 with edges having a corresponding length L as measured in each case to the centre
line distance of the component tube parts, this means that the bore in the extra coupling
piece 24 lies at a centre line distance of (1 -
)
.L from the adjacent edge. This bore forms part of connecting means for a coupling element
26 to a triangular truss.
[0023] Such an additional coupling piece 24 is arranged on each of the side surfaces of
basic element 20 so that, in addition to a square truss, a triangular truss can also
be connected all round by screwing a coupling element 26 into the indicated threaded
holes 25 in coupling pieces 23,24. Where no coupling to a truss is necessary, such
a coupling element 26 can be omitted so that no unused coupling elements are visible
which would otherwise disrupt the whole. In this case, four triangular trusses 13
as beams and a square truss 14 as upright are thus coupled all round in mutually orthogonal
position. The coupling part can thus be adapted in wholly modular and flexible manner
to the construction to be realized therewith. It is hereby no longer necessary to
hold different coupling parts in stock for each specific situation.
[0024] In the just described embodiment of the truss construction according to the invention
the orientation of triangular trusses 13 on coupling part 20 is fixed, i.e. with the
vertex upward in each case in the given position. A second embodiment of the truss
construction according to the invention, further shown in figure 3, offers more flexibility
in this respect. The coupling part herein has roughly the same structure as that of
the previous example, but in this case not only are additional coupling pieces received
in the side surfaces thereof, but also bridges 28 which mutually connect opposite
tube parts. Bridges 28 are situated on all sides of the coupling part and each comprise
two bores at a centre line distance of (1 -
). L from the adjacent tube part, wherein here also L is again the centre line distance
between opposite tube parts and the centre line length of a truss side. A triangular
truss can hereby be mounted with the vertex upward and, as in the present embodiment,
with the vertex downward. Other than in the first embodiment, the coupling part is
here applied for the mutual connection of only triangular trusses, namely five pieces
in a mutually orthogonal configuration.
[0025] Arranged halfway along in at least one of bridges 28 is an extra bore in which a
fixing eye 29 is screwed for the purpose of hoisting means. This eye 29 is thus situated
at the position of a median of coupling part 20 and provides the option of constructing
the truss construction at least partly on the ground and only hoisting it on the eye
later.
[0026] An implementation of a particular preferred embodiment of the truss construction
according to the invention is shown in figure 4 in exploded view, wherein for the
sake of clarity the connected trusses are not drawn. In this embodiment the basic
element 21 of the coupling part essentially comprises a pyramid structure constructed
from eight tube parts 51 mutually connected by means of coupling pieces 52. A structure
is chosen in this case with a quadrangular and even square base 53, although a triangular
base can in principle also be applied instead for the mutual coupling of only four
triangular trusses. For the mutual connection of the coupling pieces and tube parts
51 use is made, as in the foregoing embodiments, of a blind bolt connection by means
of freely rotatable bolts 35 which are arranged in the outer end of tube parts 51
and received in a bore 36 with internal screw thread of the coupling pieces. Because
screw bolts 35 are provided in their outer end with a socket, torque or other engaging
means and this outer end is freely accessible via bore 36 in the coupling piece, such
a threaded connection can, despite the concealed arrangement hereof, nevertheless
be firmly tightened on both sides.
[0027] Halfway along the base there is arranged a first further coupling piece 55 which
at least in projection forms an imaginary triangle with two diametrically opposite
coupling pieces at the corner points of the base. Bores are situated in the relevant
coupling pieces at the position of the corner points of this imaginary triangle. In
the primary coupling pieces 52 this is a central bore, in the further coupling piece
55 the bore lies about (1-2).L from a centre line of the adjacent base side of the
pyramid structure, wherein L is the length of this side and the length of each of
the sides of the formed imaginary triangle. The designated pyramid structure 51,52,55
thus provides the option of mutually orthogonal coupling of four triangular trusses
all round in a horizontal plane, and of coupling thereto in a vertical plane of a
triangular truss or a square truss as desired. For this purpose the coupling pieces
52,55 are provided in all side surfaces with bores 36 with an internal screw thread
which form connecting means for the purpose of coupling elements 54A,B, which are
screwed therein with bolts 35 in the same manner as tube parts 51. Coupling elements
54A,B comprise on their free outer end coupling members 30 in the form of hollow bush
parts with a conical inner surface, such as were shown in figure 2. A releasable rapid-action
coupling is hereby possible to trusses, not further drawn here, which are also provided
with such coupling members.
[0028] In order to also allow coupling of a truss in a sixth direction, there is arranged
transversely of base 53 a second further coupling piece 56 which is connected via
a first further tube part 57 to the first further coupling piece 55 and via a second
further tube part 58 to the coupling piece 52 forming the vertex of the pyramid. This
second further coupling piece 56 also forms an imaginary triangle with the two diametrically
opposite coupling pieces in the base of the pyramid structure, so that an additional
coupling element 54C can be connected in a sixth direction for the purpose of coupling
a further triangular truss in that direction. The second further coupling piece 56
is situated directly in line with the coupling piece 52 forming the vertex of the
pyramid, so that a modified coupling element 54D is applied in this direction, one
of the legs of this element being correspondingly shorter than in a coupling element
54A in order to engage on the second further coupling piece 56. In order to maintain
strength, the second further coupling piece 56 and the vertex coupling piece 52 are
manufactured integrally together with the connecting tube part, and are therefore,
other than the remaining parts of the basic element, not coupled to each other by
means of threaded connections. Triangular trusses can thus be coupled in six mutually
orthogonal directions while retaining full strength. The coupling part herein provides
a particularly attractive transition from the triangle structure of the trusses to
these orthogonal directions. The structure of the trusses as it were runs on into
the coupling part, both in the coupling elements and in the basic element thereof,
whereby the forces are distributed herein in particularly uniform manner. This latter
is further enhanced in that, where necessary, the bars 11 in the trusses are continued
into the coupling elements 54 A,D, thus avoiding loss of strength. The coupling part
is therefore fully loadable in all directions, adapted to the maximal loadability
of the connected trusses. Furthermore, owing to its relatively slender design, the
coupling part not only provides a relatively low total weight, which is desirable
from an ergonomic viewpoint and with a view to working conditions, but also an aesthetically
particularly attractive overall picture.
[0029] An additional advantage of the triangular relation arranged in the coupling elements
by means of bars is that the coupling members extending therefrom are always precisely
aligned relative to the coupling members of the triangular trusses for connecting,
which have the same relation. It is not therefore necessary in the field to work with
jigs, additional tolerances or other assist means in building a total truss construction.
[0030] In this embodiment also an engaging means for hoisting means is arranged centrally
in the coupling part, this in the form of an additional coupling part 59 which is
connected to the vertex and opposite sides in the base by means of tube parts. This
coupling part is also provided with a central bore with an internal screw thread.
In this bore can be arranged a hoisting eye, as is also the case in the foregoing
embodiment, for hoisting the construction thereon if desired. The invention thus provides
a particularly flexible and universally applicable coupling part which can be employed
in constructions of many different types.
[0031] Although the invention has been further elucidated above with reference to only three
embodiments, it will be apparent that the invention is by no means limited thereto.
On the contrary, many more variations and embodiments are possible within the scope
of the invention. While the shown and further described rapid-action coupling to the
trusses is thus particularly reliable and practical, it is not the only manner in
which a releasable (rapid-action) coupling to the trusses can be realized within the
scope of the invention. A straight bush coupling, male-female, a screw coupling, a
bayonet coupling or even a coupling in other manner can for instance also be applied
instead. Another material, for instance steel or other lightweight metal (alloy),
can also be applied instead of aluminium for all or some of the components, although
this will generally result in a higher total weight and/or cost price. In the embodiments
almost all component parts of the coupling part are coupled to each other by releasable
threaded connections, in particular the tube parts and coupling pieces, although other
connections, in particular welded connections, can at least often also be applied
instead while retaining the action and functionality of the coupling part.
1. Truss construction comprising a first truss and at least one further truss, wherein
the trusses are fixed to each other via a coupling part, characterized in that the coupling part comprises a basic element having on a first side connecting means
for a manually releasable connection to a first coupling element and on at least one
further side connecting means for a manually releasable connection to a further coupling
element, that each coupling element comprises on a side remote from the basic element
coupling members for a releasable connection to a truss, that the first truss is connected
to the basic element via the first coupling element and that the at least one further
truss is connected to the basic element via the at least one further coupling element.
2. Truss construction as claimed in claim 1, characterized in that at least one of the fixed trusses has an at least substantially triangular cross-section
and that the basic element comprises the connecting means in at least two at least
substantially mutually orthogonal planes.
3. Truss construction as claimed in claim 2, characterized in that the basic element comprises the connecting means in six at least substantially mutually
orthogonal planes.
4. Truss construction as claimed in claim 1, 2 or 3, characterized in that the coupling elements comprise a number of tube parts forming a continuation of the
truss connected thereto, and that on a side directed toward the basic element the
tube parts are connected thereto by means of a threaded connection, and on a side
remote from the basic element they carry a coupling member.
5. Truss construction as claimed in claim 4, characterized in that the tube parts are mutually connected in a polygonal relation.
6. Truss construction as claimed in claim 5, characterized in that the relation of at least one of the coupling elements comprises a triangular relation.
7. Truss construction as claimed in one or more of the foregoing claims, characterized in that the coupling member comprises a hollow bush body open on at least one side, with
an at least partly conical inner surface on which a complementary outer surface of
a coupling body lies in fitting manner, that the bush body and the coupling body are
fixed in mutually releasable manner by means of a locking pin and that the coupling
body is firmly connected to a truss.
8. Truss construction as claimed in claim 7, characterized in that the trusses are also provided on their outer end with coupling members in the form
of a hollow bush body open on at least one side with an at least partly conical inner
surface on which a complementary outer surface of a coupling body lies in fitting
manner, that the bush body and the coupling body are connected in mutually releasable
yet firm manner by means of a locking pin.
9. Truss construction as claimed in one or more of the foregoing claims, characterized in that the connecting means comprise bores in which an internal thread is arranged to close-fittingly
receive therein an external thread of a threaded end extending from a coupling element.
10. Truss construction as claimed in one or more of the foregoing claims, characterized in that the basic element of the coupling part comprises a number of tube parts which form
the edges of an imaginary cube and which are mutually coupled at corner points of
the cube via a connecting piece, that at least on the first and further side at least
one additional connecting piece is arranged which forms an imaginary triangle, at
least in projection, with two diametrically opposite connecting pieces, and that the
connecting pieces comprise the connecting means.
11. Truss construction as claimed in claim 10, characterized in that the triangle is an isosceles triangle, and more particularly an equilateral triangle.
12. Truss construction as claimed in one or more of the claims 1-9, characterized in that the basic element comprises a number of tube parts which form the sides of an imaginary
pyramid and are mutually coupled at corner points hereof via a connecting piece, and
that the connecting pieces comprise the connecting means.
13. Truss construction as claimed in claim 12, characterized in that the pyramid has a square base.
14. Truss construction as claimed in claim 13, characterized in that there is arranged at least practically halfway along at least one of the sides of
the base a first further connecting piece which, at least in projection, forms a triangle
with diametrically opposite connecting pieces in the base.
15. Truss construction as claimed in claim 13 or 14, characterized in that in a direction substantially transversely of the base of the pyramid, a second further
connecting piece is connected to the first further connecting piece and that the second
further connecting piece is arranged at least practically at the same distance from
the base as the connecting piece which forms a vertex of the pyramid, and which, at
least in projection, forms a triangle with two diametrically opposite connecting pieces
in the base of the pyramid.
16. Truss construction as claimed in one or more of the foregoing claims, characterized in that a fastening means for hoisting means is arranged on at least one of the sides of
the basic element.
17. Coupling part, basic element or coupling element for application in the truss construction
as claimed in one or more of the foregoing claims.