[0001] This invention relates to a decking system, comprising longitudinal beams and cross
beams which, altogether with decking panels are supported by variable height support
standards provided at their top with a drophead unit, wherein at least each drophead
at its side facing a beam's end is provided with holding means and also each end of
a beam being connectable to said drophead is provided with a hooking means enabling
such interconnection. Present decking systems with dropheads distinguish between systems
having beams and panels consisting of a frame with a nesting form panel and systems
having longitudinal and cross beams respectively supporting form panels. In the latter
systems the mutual distance between the cross beams can be chosen at will in order
to adapt the distance of support of the form panel to the weight of the supported
concrete and the structural strength of the form panel.
[0002] This can simply take place by a structure enabling the cross beams to be hooked down
upon a raised edge provided along both supporting flanges of the longitudinal beams.
However such longitudinal beams are unsuitable for supporting panels because of the
presence of the raised edge which constitutes a hindrance to the panel edges. Besides,
this edge builds a kind of a gutter which is easily clogged by concrete leaking through
the joint between a longitudinal beam and a form panel. While using the previously
mentioned systems using panels, mostly such panels are hooked down Nith their edges
upon projections being provided on the supporting flanges of the support beam.
[0003] It is an object of the invention to obtain a decking system or formwork whereby the
dropheads and the longitudinal beams can be used both for the support of form panels
and also for the support of cross beams in connection with form panels, thereby restricting
such previously mentioned disadvantage of concrete leakage as much as possible.
[0004] According to the invention in a decking system a drophead for supporting said beam's
end provision is made for one or more first accomodating means located between the
center line of the drophead and the vertical projection of the external edge of the
top plate of said drophead.
[0005] According to the invention it is also preferred that each longitudinal beam on each
one of its sides is provided with a supporting flange extending in a direction to
the center line and beyond the vertical projection of the top edge of said longitudinal
beam.
[0006] According to the invention in a preferred decking system the supporting flanges of
the longitudinal beams, enabling for support of the cross beams, are provided with
second accomodating means located between the center line of the beam and the vertical
projection of its upper edge.
[0007] It is also advantageous if according to the invention in a decking system the second
accomodating means are shaped as a raised edge upon which said cross beam ends can
be hooked down.
[0008] The longitudinal beam can be made from a profile on both sides being provided with
a supporting flange having a raised edge and whereby these edges have a mutual distance
which is less than the full width at the top side of the beam. Such edges may also
be provided on the drophead thereby creating a continuous raised edge upon which the
cross beams can be hooked down at will.
[0009] The ends of the supporting flanges may be provided with protrusions for taking up
form panels. The application of longitudinal beams and dropheads according to the
invention now provides for the uniform use of both form panels and cross beams together
with form sheets. Moreover all gutters, formed by the raised edges for accomodating
the cross beams are now protected against concrete clogging by the presence of the
broader top flange of the longitudinal beam.
[0010] A preferred embodiment of the decking system of the invention will now be described.
[0011] In the drawing:
Fig. 1 is a perspective side view of a longitudinal beam supported at both ends upon
a drophead;
Fig. 2A is a perspective cross section of the decking system in Fig. 1 seen in the
direction of arrow P;
Fig. 2B is a perspective cross section according to the line A-A in Fig. 1 showing
the support of the form panels upon the longitudinal beam;
Fig. 3 is a perspective cross section of Fig. 1 in the direction of arrow P showing
the support of a cross beam with form sheets upon the drophead;
Fig. 3B is a perspective cross section according to the line A-A in Fig. 1 showing
the support of a cross beam and form sheet upon a longitudinal beam.
[0012] According to Fig. 1-3B the longitudinal beam 1 is supported at both ends by a drophead
2. The longitudinal beam 1 is at both ends provided with a recess fitting over a protrusion
13 on the drophead 2 thereby obtaining a required structural longitudinal strength.
The dropheads 2 are fitted upon decking standards, stuts or props. Both the longitudinal
beam 1 and the drophead 2 are provided on both sides with a supporting flange 3 for
accomodating form panels 4.
[0013] To prevent slipping off of the panels 14 and for improving the required structural
strength between panels 4 and beams 1 the supporting flanges 3 are provided with locking
means 5. The longitudinal beam 1 and the drophead 2 are on both sides provided with
a continuous raised edge 6. The cross beam 7 hooks down with its hook 8 behind the
raised edge 6 giving thereby sufficient structural strength to the decking system.
[0014] Since the raised edge 6 runs in a continuous way along the entire length, the cross
beams 7 can be located at any desired position for supporting the form panel 14 most
economically and also to take care of the structural joint between the longitudinal
beams 1 and the cross beams 7.
[0015] The longitudinal beam 1 and the drophead 2 are each provided with a top flange 9
and a top plate 10 which extend beyond the raised edges 6. This prevents as much as
possible any leakage of concrete through the seam or joint 11 reaching the gutter
12. Moreover the circumferential panel edges are not obstructed by the raised edge
6.
[0016] The longitudinal beam as described can be manufactured from aluminium by the extrusion
process enabling easy handling by its low own weight. It may be clear however that
although reference has been made in the description to a continuous raised edge 6,
also a discontinuous raised edge could be used to establish sufficient structural
strength between the longitudinal and cross beams respectively.
[0017] In the embodiments as described the cross beams 7 are provided with recesses which
enable their hooking down upon the raised edges 6; nevertheless the supporting flanges
may also be provided with recesses or openings to replace the raised edge whereas
the cross beams may be provided with protruding hooks or noses for hooking on.
[0018] Insofar as in the foregoing description reference is made to protrusions, it will
be understood that any other device may be adopted causing a similar function to unite
and thereby lock elements of structural systems for working loads as will be generally
applicable for decking systems.
1. Decking system, comprising longitudinal beams and cross beams which, altogether
with decking panels are supported by variable height support standards provided at
their top with a drophead unit, wherein at least each drophead at its side facing
a beam's end is provided with holding means and also each end of a beam being connectable
to said drophead is provided with a hooking means enabling such interconnection, characterized
in that for supporting said beam's end there are provided one or more first accomodating
means located between the center line of the drophead and the vertical projection
of the external edge of the top plate of said drophead.
2. Decking system according to claim 1, charcterized in that each longitudinal beam
on each one of its sides is provided with a supporting flange which extends, in a
direction to the center line and beyond the vertical projection of the top edge of
said longitudinal beam.
3. Decking system according to claim 1 and 2, characterized in that the supporting
flanges of the longitudinal beams, to enable for support of the cross beams, are provided
with second accomodating means located between the center line of the beam and the
vertical projection of its upper edge.
4. Decking system according to claim 1 and 2, characterized in that the second accomodating
means are shaped as a raised edge upon which said cross beams can be hooked.
5. Longitudinal beam for use with a decking system according to anyone of the foregoing
claims, characterized in that second accomodating means for accomodating cross beam
ends are located between its center line and its vertical projection of its upper
edge.
6. Drophead for use with a decking system according to anyone of the foregoing claims,
characterized in that one or more first accomodating means for accomodating beam ends
are located between its center line and its vertical projection of the external edge
of its top plate.