The following co-pending patent application is hereby incorporated by reference in its entirety: International Patent Application No. PCT/AU2015/000594 titled “A FORMWORK PANEL ASSEMBLY” in the name of Form 700 Pty Ltd.
The present application claims priority from:
This disclosure relates to a formwork assembly for moulding upwardly extending building features such as columns or walls that extend between adjacent floor slabs.
Construction of multi-storey concrete buildings involves sequential floor by floor casting of concrete structures. In order to cast building components such as floor slabs, columns and other features, a casting structure referred to as formwork is used to progressively advance the building upwardly, floor by floor.
This generally involves using a lower floor slab as a support platform for formwork to cast the next floor slab above. In order to support an upper floor slab, upwardly extending building features such as columns and internal walls are also cast to support the upper floor slab once the formwork is removed.
Formwork to create a floor slab will comprise horizontal elements that are positioned between vertical building features such as columns and walls that extend between floor slabs. Reinforced concrete uses reinforcing steel in the form of steel rods, steel frames and mesh, which is positioned on and within formwork prior to pouring of concrete. In the case of vertical building features, the reinforcing framework must extend above and clear of the slab, so that it is in turn, exposed to allow attachment of further upwardly extending reinforcement formwork. This allows extension of reinforcement frames for the progressive casting of vertical features such as columns or walls.
Only once the lower floor slab is formed, can the formwork for the vertical feature, be this a column, a wall or the like, be put in place around the reinforcing steel frame work, ready for casting of the vertical feature above the new floor level.
This causes a delay in setting up the formwork required for the next floor slab. It is necessary for the concrete within the columns or other vertical features to set prior to removal of the formwork, which then enables the formwork for the next floor slab to be put in place. Obviously, the formwork for the next floor slab needs to abut against the vertical features so as to incorporate them in the upwardly extending building structure.
Current column or wall formwork cannot be used concurrently with floor slab formwork, as the column or wall formwork could not be removed. Because this column or wall formwork must extend from the floor surface of the lower slab to the underside surface of the upper floor slab, it is wedged in place between these two concrete surfaces. The formwork would need to be destroyed or broken to be removed.
It is against this background and the problems and difficulties associated therewith that the present invention has been developed.
Certain objects and advantages of the present invention will become apparent from the following description, taken in connection with the accompanying drawings, wherein, by way of illustration and example, an embodiment of the present invention is disclosed.
According to a first aspect, there is provided a formwork assembly for moulding an upwardly extending building feature comprising at least two surface forming elements for forming one side of said building feature, wherein each surface forming element comprises a casting surface and a pair of lengthwise extending parallel edges, wherein in use, the surface forming elements are stacked by abutting along these edges, and each of these edges comprise a means for interlocking the surface forming elements with respect to each other so that the resulting formwork assembly forms a single, continuous casting surface.
That is to say, in one form, in use, the surface forming elements extend substantially horizontally.
According to a further aspect, there is provided a surface forming element for a formwork assembly for moulding an upwardly extending building feature and comprising at least two surface forming elements, where each surface forming element comprises a casting surface, and a pair of lengthwise extending parallel edges, wherein in use, the surface forming elements are stacked by abutting along these edges, and each of these edges comprise a means for interlocking the surface forming elements with respect to each other so that the resulting formwork assembly forms a single, continuous casting surface.
In one form, each surface forming element comprises a panel assembly.
In one form, the interlocking means for each lengthwise extending parallel edge comprises at least one projection and at least one recess, wherein in use, interlock is effected by engagement of the projection of one element with the recess of the other, and vice versa.
In one form, the means for interlocking the abutting formwork elements comprises a profile shape of the edges.
In one form, the profile shape is substantially constant throughout the length of the surface forming element.
In one form, the profile shape comprises a single projection and a single recess.
In one form, for each surface forming element, the profile shape of the two edges differs inasmuch as a profile shape of a first of the edges is an inversion of the other of the edges.
In one form, the profile shape comprises a step, and step-shaped recess adjacent to the step, where this step-shaped recess is shaped to receive a step of a further surface forming element.
In one form, in an alternative, the interlocking means for each lengthwise extending parallel edge comprises a plurality of projections and recesses spaced apart lengthwise along the edges. In one form, the projections comprise prongs or teeth, and the recesses comprise apertures for receiving the prongs or teeth.
In one form, each surface forming element comprises a means for securing a pair of stacked surface forming elements with respect to each other.
In one form, each surface forming element comprises a means for securing a pair of surface forming elements with respect to each other in an end to end relationship.
In one form, pins or fasteners such as bolts or screws extend through aligned holes in the adjacent frame members to secure the two surface forming elements together.
In one form, in an alternative, each surface forming element comprises a catch for securing the two surface forming elements together.
As will be appreciated in the above description, in use, the formwork assembly can extend from an upper surface of a lower floor slab to an underside surface of a floor slab above. This formwork assembly will be held captive between these surfaces until the uppermost surface forming element is removed, thereby allowing successive removal of the remaining surface forming elements from the newly formed concrete surface.
In one form, each of the surface forming elements comprises a rectilinear perimeter frame and an infill panel.
In one form, the perimeter frame comprises a border extending about a perimeter of the infill panel so as to form the continuous casting surface along with the infill panel.
In one form, the border is made of a more wear resistant material than the infill panel.
In one form, the border is made from a metal, and the board is made from one of a timber, a plywood, a plastic or a composite.
In one form, the frame comprises a pair of lengthwise extending parallel side members, a pair of end members, and a plurality of spaced apart bracing members bridging the side members.
In one form, the lengthwise extending parallel side members of the frame comprise a plurality of apertures spaced apart there along, for receiving threaded fasteners, pins or the like to secure a pair of stacked surface forming elements with respect to each other.
In one form, the end members of the frame comprise apertures for receiving threaded fasteners or pins or the like to secure a pair of surface forming elements with respect to each other endwise.
In one form, the formwork assembly further comprises an edge element at the bottom, at least, of each stack of surface forming elements.
In one form, the formwork assembly further comprises an edge element at the top of each stack of surface forming elements.
In one form, each edge element comprises a pair of lengthwise extending parallel side edges, where a first side edges comprises a square edge for forming an end edge, and a second side edge comprises a profile shape identical to that of the surface forming element, so that a surface forming element can be stacked atop of, and interlock with this second side edge.
In one form, the interlocking feature comprises either of a male or a female feature or portion, where the male feature or portion is adapted to engage the female feature or portion. In other words, the interlocking feature comprises either of a projection or a recess, where the projection is adapted to interlock with the recess and vice versa.
For a given area to be formed, a number of surface forming elements can be used, which in turn reduces the size and weight of each surface forming element. This greatly assists in easier manual handling of the various elements forming the assembly.
The width (or height when in use) of each surface forming element will be determined by the number of panels used and the distance between the upper surface of the lower floor and the underneath surface of the upper floor being formed. The length of the surface forming elements will depend on the type of vertical feature being created. For example, columns will require shorter lengths by comparison to internal walls which will require longer lengths.
An internal wall may be formed by using a pair of formwork panel assemblies spaced apart by the required thickness of the wall. Additional formwork can be placed so as to extend between the pair of formwork assembly panels at each end and held in place to form the ends of the walls. Ties can extend between the pair of formwork assembly panels to hold them together under the weight of the concrete, and the formwork forming the ends of the walls can be braced with respect to the pair of formwork panel assemblies.
In the case of forming a column, the formwork assembly panels can be connected along abutting edges and ties can extend between opposing pairs of formwork panel assemblies. Alternatively, a bracing frame can be formed around the assembled formwork panels to hold them in position.
A detailed description of one or more embodiments of the invention is provided below along with accompanying figures that illustrate by way of example the principles of the invention. While the invention is described in connection with such embodiments, it should be understood that the invention is not limited to any embodiment. On the contrary, the scope of the invention is limited only by the appended claims and the invention encompasses numerous alternatives, modifications and equivalents. For the purpose of example, numerous specific details are set forth in the following description in order to provide a thorough understanding of the present invention.
The present invention may be practiced according to the claims without some or all of these specific details. For the purpose of clarity, technical material that is known in the technical fields related to the invention has not been described in detail so that the present invention is not unnecessarily obscured.
Embodiments of the present invention will be discussed with reference to the accompanying drawings wherein:
In the following description, like reference characters designate like or corresponding parts throughout the figures.
Referring now to
The surface forming element 1 comprises a generally rectilinear and elongate panel, a perimeter frame 10 and an infill panel 20. The frame 10 comprises a pair of lengthwise extending parallel side members 12, a pair of end members 14, and a plurality of spaced apart bracing members 15 bridging the side members 12.
With reference to
In this embodiment, the infill panel 20 is made of a material such as plywood, having a thickness of approximately 12 millimetres, but other materials (such as corflute or FRP) of varying thicknesses (depending on strength) may also be used.
Referring now to
It should be understood that a formwork assembly 100 can comprise as many surface forming elements 1 arranged in as many stacks as is required for the particular application.
To facilitate this stacking, each of these edges 12A comprise a means for interlocking the surface forming elements 1 with respect to each other so that the resulting formwork assembly 100 forms a single, continuous casting surface C.
With reference to
In this embodiment, each profile shape comprises a squared, step-shape comprising a (male or projecting) step 30, and a (female) step-shaped recess 40 adjacent to the step 30, where this step-shaped recess 40 is shaped to receive a step 30 of a further surface forming element 1.
For each surface forming element 1, the profile shape of the two edges 12A differs inasmuch as a profile shape of a first of the edges 12A1, is an inversion of the other of the edges 12A2. That is to say, for a profile shape of a first of the edges 12A1 the male step 30 extends along the continuous casting surface C, and the step-shaped recess 40 of the other of the edges 12A2 extends along the continuous casting surface C, and vice-versa.
In use, the male step 30 extending along edge 12A1 of a first surface forming element 1, is received in the recess 40 along the lower edge 12A2 of a further surface forming element 1 stacked atop of the first surface forming element 1. In this way, overlapping joints are formed that prevent egress of concrete while at the same time providing a smooth and flush continuous casting surface C against which concrete can be moulded, when the surface forming elements 1 are assembled.
The frame 10 is constructed primarily from a tubular aluminium (although other materials may be used), because this material can be extruded to produce the required cross-sectional shapes.
Being made of a harder, more wear resistant material than that of the infill panel 20 means that the perimeter frame 10 is less susceptible to damage resulting from normal handling and positioning of surface forming elements 1, than would be the infill panel 20 if this extended beyond the edge of the perimeter frame 10.
The lengthwise extending side members 12 of the frame 10 comprise a plurality of apertures 24 spaced apart there along, for receiving threaded fasteners, pins or the like.
As can be seen in
Similarly, the end members 14 of the frame 10 comprise apertures 34 for receiving threaded fasteners or pins. As illustrated in
With reference to
A first of the lengthwise extending parallel side edges 50A1 comprises a square edge for resting atop of a floor or other surface, and the other lengthwise extending parallel side edges 50A2 comprises a profile shape identical to that of the surface forming element 1, so that a surface forming element 1 can be stacked atop of, and interlock with, the lengthwise extending parallel side edge 50A2.
The formwork assembly 100 further comprises a pair of narrowed surface forming elements 1A, one each at the top of (although these could be used anywhere) the two abutting stacks of three surface forming elements 1. These narrowed surface forming elements 1A are almost identical to the surface forming elements 1 described above, differing in that the distance between the side edges 12A is less. These narrowed surface forming elements 1A can be used in conjunction with the standard surface forming element 1, and enable a required height to be achieved using a combination of these.
With reference to
As will be seen from the above description, the formwork assembly 100 can be easily assembled from the bottom up so as to put in place formwork which can mould vertical building features between floor slabs. Once the formwork assembly is in place, the formwork forming the underside surface of the upper floor can abut against the upper edge of the formwork assembly 10.
When no longer required, the formwork assembly 100 can be dis-assembled from the top down.
Referring now to
With reference to
In addition to the apertures 24, the lengthwise extending side members 12 of surface forming element 1A comprise a further set of apertures 44 spaced apart there along, for receiving threaded fasteners, pins or the like. Whereas the apertures 24 extend between inner and outer (relative to the continuous casting surface C) surfaces of the lengthwise extending side members 12, the apertures 44 extend perpendicular to the apertures 24, between upper and lower edges of each lengthwise extending side member 12.
As can be seen in
Referring now to
Similar to the lengthwise extending side members 12 of surface forming element 1A, the edge element 50A comprises a first set of apertures 24, and a second set of apertures 44, which in use, align with the apertures 24 and 44 respectively, of surface forming elements 1A stacked atop of the edge element 50A, to receive bolts or pins which secure these together.
While not illustrated, a wall or column can be formed by positioning a pair of formwork assemblies in an opposing relationship, and extending horizontal ties between them. Each horizontal tie locates in one of the apertures 24 in the surface forming elements, comprises a Z-tie rod, and resists the weight of the concrete pushing the adjacent formwork panel assemblies apart.
In some instances it will be necessary to form an edge or end of a wall or column between a pair of formwork assemblies 100 arranged in an opposing relationship. In order to facilitate this, a plurality of end brackets 120 and 140 are secured with respect to the surface forming elements 1A, and these end brackets 120 and 140 support beams 160 which bridge (i.e. extend between) the brackets 120 and 140 associated with each of the pair of opposing formwork assemblies 100, and these beams 160 in turn support vertically extending formwork (not illustrated) such as planks or sheets of a suitable material (such as plywood), which will form the edge or end of the wall once the concrete is poured.
Each of the end brackets 120 and 140 comprises a pair of parallel spaced apart arms 150, and a connector 152 which bridges the arms 150, so that collectively, the arms 150 and the connector 152 define a slot 154 therebetween. In use, each of the arms 150 is inserted into an end of one of the contiguous tubular side members 12. An end of one of the beams 160 is then received in the slot 154. The arms 150 comprise holes 158 via which the arms 150 can be pinned or bolted in the side members 12.
With reference to
With reference to
With reference to
Throughout the specification and the claims that follow, unless the context requires otherwise, the words “comprise” and “include” and variations such as “comprising” and “including” will be understood to imply the inclusion of a stated integer or group of integers, but not the exclusion of any other integer or group of integers.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement of any form of suggestion that such prior art forms part of the common general knowledge.
It will be appreciated by those skilled in the art that the invention is not restricted in its use to the particular application described. Neither is the present invention restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that the invention is not limited to the embodiment or embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the invention as set forth and defined by the following claims.
Number | Date | Country | Kind |
---|---|---|---|
2017900736 | Mar 2017 | AU | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/AU2017/000149 | 7/18/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2018/018063 | 2/1/2018 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
997647 | Brust | Jul 1911 | A |
1151631 | Walker | Aug 1915 | A |
1236824 | Davis | Aug 1917 | A |
2447272 | Parkes | Aug 1948 | A |
2801454 | Troiel | Aug 1957 | A |
3512324 | Reed | May 1970 | A |
3529389 | Wilkins | Sep 1970 | A |
3859000 | Webster | Jan 1975 | A |
4573303 | Figari | Mar 1986 | A |
5255888 | Workman | Oct 1993 | A |
5305567 | Wittler | Apr 1994 | A |
5348778 | Knipp | Sep 1994 | A |
5373678 | Hesser | Dec 1994 | A |
5375810 | Mathis | Dec 1994 | A |
5425210 | Zafir | Jun 1995 | A |
5870867 | Mitchell | Feb 1999 | A |
6443418 | Itamochi | Sep 2002 | B1 |
6581898 | McCracken | Jun 2003 | B2 |
6588171 | Pryor | Jul 2003 | B2 |
6769835 | Stridsman | Aug 2004 | B2 |
8590252 | Cordeiro | Nov 2013 | B2 |
8997436 | Spear | Apr 2015 | B2 |
9890541 | Hullenkremer | Feb 2018 | B2 |
20020189182 | Record | Dec 2002 | A1 |
20060032168 | Thiers | Feb 2006 | A1 |
20140093677 | Permesang | Apr 2014 | A1 |
Number | Date | Country |
---|---|---|
2204558 | Dec 1997 | CA |
204326519 | May 2015 | CN |
105421708 | Mar 2016 | CN |
Entry |
---|
International Search Report and Written Opinion dated Nov. 22, 2017, issue in corresponding Application No. PCT/AU2017/000149, filed Jul. 18, 2017, 8 pages. |
Number | Date | Country | |
---|---|---|---|
20190169864 A1 | Jun 2019 | US |