[0001] This invention relates to fixed constructions.
[0002] The invention includes an extruded metal beam and connectors for a plurality of beams
as well as a method of combining the beams and the connectors into a structure.
[0003] According to the invention a method of erecting a structure comprises the steps of
attaching a first base plate to a base for the structure, pivotally connecting a first
constructional element to the first base plate , rigidly connecting one or more additional
constructional elements to the free end of the first constructional element by first
hoisting the free end of each connected constructional element to a height sufficient
to allow the rigid connection, of the additional constructional element, to the free
end and connecting the free end of the last constructional element to a second base
plate which is attached to the base.
[0004] In the preferred form of the invention the structure is arch-like, and the method
comprises the preliminary step of cutting the ends of the constructional elements
at a - predetermined angle, which will depend on the curvature of the arch.
[0005] The method includes the additional steps of rigidly securing the structure to the
base plates'once erected.
[0006] The structure of the invention may be erected, along with a number of similar structures,
in the arrangement of a building and, if necessary, be connected to one another at
least in pairs by means of cross bracing and additionally or in the alternative, by
means of purlins. The method therefore includes the additional steps of erecting a
plurality of structures in a predetermined arrangement to form a structural whole
or building frame and cladding the building frame. The structures may be connected
to one another in pairs so that the method includes the further steps of securing
one more constructional elements between adjacent pairs of the structures at predetermined
intervals.
[0007] The method preferably includes the further step of connecting adjacent structures
together in pairs by means of one or more constructional elements secured to the two
structures in a pair. The resulting pairs of structures may be connected to one another
by means of purlins or tension members.
[0008] The constructional elements located across the building frame from structure to structure
will be referred to as "purlins" while the tension members will be referred to as
"cross bracing" or "ties", for the sake of clarity. The constructional elements used
as purlins may be the same as the constructional elements used in the construction
of the arch-like structures, but it will be appreciated that suitable structural elements
of a different shape may also be used.
[0009] The two structures in a pair with their connecting constructional elements are preferably
erected at the same time in which case the method of the invention will comprise the
steps of pivotally connecting two adjacent first constructional elements to their
respective first base plates, rigidly connecting the two first constructional elements
to one another by means of a purlin, rigidly connecting one or more additional constructional
elements to the free ends of the first constructional elements by first hoisting the
free ends of the connected constructional elements to a height sufficient to allow
the rigid connection of an additional purlin and constructional elements to the free
ends and connecting the free ends of the last constructional elements to a pair of
second base plates attached to the base.
[0010] Alternatively, or in addition to the purlins connecting adajcent structures, the
structures may be cross braced.
[0011] In the preferred form of the invention the method includes the intermediate steps
of locating a connector element or elements to the free end or ends of the constructional
element or elements and connecting the additional constructional element or elements
to the connector. The term "additional constructional element or elements here includes
the constructional elements of the arch-like structure as well as the purlins.
[0012] The invention includes a constructional element comprising an expanded extruded beam,
preferably of metal, which includes a box section on either end of a profiled web,
the web being cut, between the profiles.at predetermined intervals and expanded.
[0013] In the preferred form of the invention the constructional element is optionally provided,
along an upper edge thereof, with channels adapted to receive the enlarged edge of
a flexible sheet memeber.
[0014] The invention also includes a connector comprising an extrusion of H-section, the
bar of the H being adapted to abut the ends of the constructional elements in use
and the legs of the H being adapted to receive the ends of the constructional elements
in use.
[0015] The legs of the H and the ends of the constructional elements are preferably formed
with holes adapted to receive bolts.
[0016] The bottom connectors may be of H-section, but the remaining conector H-section extrusions
may conveniently be provided with at least one bracket on the side of the H, preferably
extruded integrally with the H-section. The bracket preferably comprises a channel
with opposed walls adapted to receive the end of the purlin therebetween.
[0017] The connector may conveniently include a flange on the outside of the H which flange
may be provided with means, preferably an aperture formed therein, to receive the
cross bracing elements.
[0018] A base connector is also provided comprising an extruded box section tube, adapted
to fit within the legs of the H of the H
7section connectors, which is integral with a wide base.
[0019] The base may be connected to the ground a foundation or the like.
[0020] The above structure and the method of erecting it, is ideally suited for larger industrial
or agricultural buildings, or for large temporary structures. However the constructional
elements and connectors can be scaled down for the con÷ struction of permanent or
temporary domestic buildings.
[0021] In one such a form the connectors are adapted to allow the hinging of the beams to
a position where, in a dismantled form the beams, still connected to one another at
their ends, lie adjacent one another. The purlins are preferably box-shaped and dimensioned
to recieve the ends of the beams therein in dismantled form, means being provided
to connect an axle to the resultant flat structure to provide a trailable vehicle.
[0022] The invention is further described with reference to the accompanying drawings in
which
Figure 1 is a diagrammatic sectional side elevation of an arch-like structure according
to the invention;
Figure 2 is a plan view of a part of the structure showing the connector;
Figure 3 is a cross section through an un-expanded extruded beam;
Figure 4 is a cross section through an expanded beam;
Figure 5 is a side elevation of a part of an expanded beam;
Figure 6 is an end elevation of a base connection; and
Figure 7 is an end elevation of a light-weight temporary structure.
[0023] The structure or arch-like structure 10 shown in Figure 1 is part of the structural
whole or frame of a building and comprises a plurality of constructional elements
or beams 12 supported on base plates 14. The beams 12 are connected to one another
by means of connectors 16.
[0024] The arches 10 are erected in pairs, each arch in a pair being connected to the other
by means of purlins 18 (shown in cross section in Figure 1) the purlins being the
same beams as are used in constructing the arch 10 with the exception that the ends
of the purlins are cut at right angles while the ends of the beams 12 are cut at a
pre= determined angle. This angle will, of course, depend on the curvature of the
arch.
[0025] The arch is erected as follows: The base 11 is prepared. This is normally a level
site which is provided with a concrete screed and the base plates 14 are placed in
position. A pair of first beams 12a are pivotally connected to their respect base
plates 14 by means of bolts and nuts 20. The beams 12a are allowed to lie virtually
flat on the ground. The connectors 16 are now attached to the ends of the beams 12a
in a manner to be described below and the purlin 18 between the two beams 12a is connected
to the connector 16. The next pair of beams 12b is now attached, each beam 12b in
the pair being connected to its respective connector. To do this the free ends of
the connected beams 12a are lifted clear of the ground to allow the rigid connection
thereto of the next or additional beams 12b. It will be appreciated that the beams
12a need not be hoisted to their final position, it is sufficient merely to hoist
them high enough for the free ends of the beams 12b to rest on the ground.
[0026] The next pair of connectors 16 is now attached to the free ends of the second connected
beams 12b which are then hoisted just high enough for the connection thereto of the
next pair of beams 12c. the hoisting apparatus being moved from the ends of the first
beams 12a to the ends of the second beams 12b.
[0027] In this manner the whole arch 10 is erected by merely lifting the free ends of each
connected beam pair to allow the attachment thereto of the next beam until the last
pair of beams 12d are fixed in place which beams are then connected to the second
base plates on the other side of the structure by means of bolts and nuts 22. The
arch 10 may now be rigidly connected to the first base plate by means of bolts 23.
[0028] In this manner a plurality of arches may be erected according to a predetermined
plan to provide a building frame comprising pairs of connected arches. The resulting
pairs of arches may be connected to one another by means of ties or cross bracing
extending from flanges 30 which are arranged to project from the connectors 16.
[0029] The side elevation of Figure 1, being diagrammatic, does not show the diamond pattern
of the webs which will be described below.
[0030] The connector 16 can.be seen in greater detail in the plan view in Figure 2 where
the H-section extrusion can be seen to comprise two pairs of legs 24 extending on
either side of a cross bar 25. The extruded H-section 24 is cut to the desired length
which is related to the depth of the beams 12, the ends of which fit between the legs
24 on either side of the cross bar 25. To secure the connector 16 to the beams 12,
bolts and nuts 26 are located in appropriately positioned holes drilled into the box
sections of the beams 12 and the legs 24 of the H. The H-section is extruded integrally
with two channel formations 27, one on either side of the H. The channel formations
27 comprise two walls 28 adapted to receive the purlins 18, which are the same or
similar to as the arch beams 12. The walls 28, in fact, provide the brackets to support
the purlin beams 18 and are provided with appropriately positioned holes for bolts
and nuts 29 which, once again, pass through the box sections of the beams 18.
[0031] In addition to the extruded legs 24 and brackets 28, flanges 30 are provided on either
side of the connectors 16 and formed with the holes 32 for the cross bracing or tie
rods which, in the completed building frame, will extend between the pair of arches
and, if necessary, between the arches in a pair. It will be appreciated that, in situations
where the arches in a pair are connected to one another by means of purlins extending
between the two and without cross bracing, and where the cross bracing extends between
adjacent pairs of arches, the brackets 28 need be provided only on one side of the
H while the flange 30 need be provided only on the other side of the H.
[0032] The beams 12 are produced from an aluminium extrusion which is shown in Figure 3
to comprise a profiled web 34 with a box section 36, 38 on either side thereof. The
upper box section
38 is optionally provided with a double sided channel section, the purpose of which
will be described below.
[0033] To arrive at the shape shown in Figures 4 and 5, the profiled web 34 is cut between
the profiles at predetermined intervals which will depend on the desired final shape
of the beam. The cuts between adjacent profiles are staggered and the extrusion is
then gripped by mechanical means at the box sections which are then pulled apart to
expand the web into the diamond pattern shown in Figure 5. This process is well known
and described in several South African patents to Jury and Spiers (Pty) Limited.
[0034] The beams 12 of the arches and the beams 18 of the purlins are both the same or similar
as has been nenticned above. The ends of the beams 12 are cut at an angle which will,
of course depend on the desired curvature of the arch,while the ends of the purlin
beams 18 are cut at right angles to the longitudinal axes thereof.
[0035] Figure 5 also shows the connector 16 in side elevation in position on a purlin 18
where it can be seen how the flange 30 on one side of the connector 16 fits between
the ties 34a formed by the expanded web of the beam.
[0036] An alternative to the base 14 is the use of the base connector 114 shown in Figure
6. This connector has dimensions similar to the end of the beam 12 so that it fits
within the legs H connector 16. The base connector 114 includes a wide base 114a with
tubular box section projection 114b which fits within the legs of the H as has been
mentioned above. The projection 114b is jig drilled as are the other components of
the system, for the location of bolts. The base may be provided with ground spikes
(not shown) which may be cemented to the concrete base 100 of the building.
[0037] Figure 7 shows a light weight structure 200 embodying the principles of the invention.
The structure comprises beams 202, connectors 204 and purlins 206.
[0038] A fabric cover 208 is provided and poles 210 spread the fabric on either side of
the structure. Pegs or spikes 212 are provided to hold lines 214 which secure the
poles and similar pegs hold the base plates 214 arid the beams 202 in position.
[0039] The structure 200 can be dismantled and converted into a trailer by removing only
some of the bolts in the connectors and folding or hinging the still connected beams
with their free ends towards one another in zig zag fashion. The hinged beams are
laid flat and the channel shaped purlins 206 are slid over the ends of the beams and
the connectors and bolted into position forming a flat structure. An axle assembly
(not shown) and a towbar assembly (not shown) are provided and once these are bolted
in position the structure is converted to a trailable vehicle on which the fabric
cover and other goods can be loaded. This structure 200 is useful as temporary garage,
tent or the like.
[0040] Once the structure is erected and all the arches in the building frame are rigidly
connected, the frame may be clad with conventional sheet material cladding such as
roofing sheets. Alternatively sheets of flexible material or tarpaulins of canvas,
plastics impregnated canvas or a synthetic textile may be used. Prior to their location
on the structure, the sheets will be provided with rope reinforced edges or similarly
enlarged edges along two sides thereof which are then drawn into the channels 42 and
44 provided along the upper box sections 38 of the beams 12 of two adjacent arches
10. The sheets will, of course, be drawn into the facing channels of two adjacent
arches to span the space between the adjacent arches 10. With properly designed leaders,
the sheets may be pulled, by means of ropes located in the channels 42 and 44, from
one side of the frame completely over the frame to the other side. If an appropriately
sized rope reinforcing edge is used, the joints between the beams 12 and the sheet
material should be water proof.
[0041] It will be appreciated that the constructional elements and connectors of the invention
can be mass produced and bolted together without scaffolding or the like. In addition,
due to the simplicity of the elements involved, the structures can be erected largely
with unskilled labour. The structural method and means provided is particularly suitable
for temporary buildings as the building and building frames can be dismantled and
re-erected rapidly some other place.
1. A method of erecting a structure comprising the steps of attaching a first base
plate to a base for the structure, pivotally connecting a first constructional element
to the first base plate, rigidly connecting one or more additional constructional
elements to the free end of the first constructional element by first hoisting the
free end of each connected constructional element to a height sufficient to allow
the rigid connection, of the additional constructional element, to the free end and
connecting the free end of the last constructional element to a second base plate
which is attached to the base.
2. A method according to claim 1 which includes the additional step of cutting the
ends of the constructional element at a predetermined angle and erecting a plurality
of structures in a predetermined arrangement to form a structural whole or building
frame and cladding the frame.
3. A method according to claim 1 or claim 2 characterised in that two adjacent first
constructional elements are pivotally connected to their respective first base plates,
the two first constructional elements are rigidly connected to one another by means
of a purlin, one or more additional constructional elements are rigidly connected
to the free ends of the first constructional elements by first hoisting the free ends
of the connected constructional elements to a height sufficient to allow the rigid
connection of an additional purlin and constructional elements to the free ends and
connecting the free ends of the last constructional elements to a pair of second base
plates attached to the base.
4. A method according to any one of claims 1 to 3 which includes the intermediate
steps of locating a connector element or elements to the free end or ends of the constructional
element or elements and connecting the additional constructional element or elements
to the connector.
5. A constructional element comprising an expanded extruded beam which includes a
box section on either end of a profiled web, the web being cut between the profiles
at predetermined intervals and expanded, and the element including channels which
are adapted to receive an end of a flexible member.
6. A connector comprising an extrusion of H-section, the bar of the H being adapted
to abut the ends of. the constructional elements in use and the legs of the H being
adapted to receive the ends of the constructional elements in use, characterised in
the provision of a bracket comprising a channel with opposed walls which is adapted
to receive the ends of similar constructional elements therebetween.
7. A building system including a connector for pivotal connection of a constructional
element to a base, a plurality of purlins attached to the constructional element and
connecting means associated with the base for an axle and towbar for trailable connection
of the building system to a vehicle.