Formwork system

Abstract

Disclosed is a building formwork system (100) including a building formwork component (102), building formwork connector (204) and building formwork cap (306). In one arrangement, the building formwork system (100) can comprise a 5 number of inter-connected building formwork components (e.g. 102a, 102b, 102c) that define a column, a building formwork connector (204) connecting two of the building formwork components (e.g. 102a, 102b) in the column, and two building formwork caps (306a, 306b) that are connected at two opposite sides of the column. 20869641_1 (GHMatters) P106145.AU.3 20 24 20 40 72 14 J un 2 02 4 A B S T R A C T 2 0 2 4 2 0 4 0 7 2 1 4 J u n 2 0 2 4 c o l u m n .

Description

Technical Field This disclosure relates to a building formwork system including a building 5 formwork component, building formwork connector and building formwork cap. Background Art Formwork is used in the construction of buildings and other structures to provide a temporary or permanent mould into which concrete or other similar materials may be poured. 10 Stay-in-place (or lost) formwork that comprises a number of components, some of which can be formed of plastic, is also known in the art. It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission that the prior art forms a part of the common general knowledge in the art, in Australia or any other country. 15                            Summary Disclosed herein is a building formwork cap for capping a building formwork component (e.g. the component may be of a moulded e.g. extruded plastic material). The building formwork component can be of the type that comprises walls defining a cavity for receipt therein of cementitious material in use. The 2 0 building formwork component may be applied as stay-in-place (or lost) formwork. The cap can be used to e.g. enclose (i.e. to cap) an end of the building formwork component to assist in the retention therein of the cementitious material in use. The cap can be configured such that it is able to resist deflection in use (e.g. from 2 5 the hydraulic pressure applied thereto in use by the cementitious material). 2024204072   14 Jun 2024 For example, when the cap is formed from a plastic material (e.g. by plastic moulding such as extrusion), the cap may comprise an outer skin and an internal reinforcement structure. Together with the outer skin, the internal reinforcement structure can function to resist deflection. 5 In this regard, the internal reinforcement structure of the cap may provide rigidity to the cap, which may prevent bowing of the cap in use when under load from e.g. the cementitious material that has been poured into the building formwork component. This prevention of bowing, blowout (or other failures of the cap) may be especially required in circumstances where a significant volume of 10 cementitious material has been received in the building component (e.g. the component has been filled with cementitious material). One such circumstance may, for example, be where a load-bearing structure (such as a column) is being formed using the building formwork component together with the building formwork cap. 15 The cap can comprise first and second engagement portions, each for engaging corresponding first or second engagement portions of the building formwork component. The interaction of the cap engagement portions with the corresponding engagement portions of the building formwork component can function to retain the cap to the component, typically in a secure manner whereby 2 0 the cap resists disconnection in use. The cap can further comprise a cap portion that extends between the first and second engagement portions. The cap portion can be configured to resist deflection intermediate the first and second engagement portions. For example, the cap portion may comprise the outer skin and internal reinforcement structure 2 5 as set forth above. When the cap is viewed in profile (e.g. from a top or bottom end thereof), the first and second engagement portions of the cap may be defined at respective first and second opposite ends of the cap portion (e.g. at end edges thereof). 2024204072   14 Jun 2024 For example, the cap may generally be defined as an elongate section, wherein each of the first and second engagement portions of the cap may extend for the length of the elongate section (i.e. the engagement portions may extend longitudinally along respective first and second longitudinal sides of the elongate 5 section). The cap portion may define a wall of the elongate section. Thus, when the elongate section is viewed in profile, it can be seen that the first and second engagement portions may be located at the first and second opposite ends of the wall defined by the cap portion. As set forth above, the cap can be configured to engage with the first and second 10 corresponding engagement portions of the building formwork component. The corresponding engagement portions may be disposed at the ends of respective spaced sidewalls of the building formwork component such that, when the cap is engaged to the building formwork component, the cap portion is able to span a gap defined between said spaced sidewalls. 15 In one embodiment the cap may be configured to substantially fill a space defined between the sidewalls of the building formwork component (e.g. the space may be defined between the sidewalls and the corresponding engagement portions). Further, this space may also be in part defined by an end web of the building formwork component. When the building formwork component is viewed in 2 0 profile, such a space can be seen to be located at one end of the component. The filling of such a space with the cap may further increase the rigidity of the overall formwork structure. In one embodiment the first and second cap engagement portions may be configured for slideable engagement with the first and second corresponding 2 5 engagement portions of the building formwork component. The configuring of the cap engagement portions for slideable engagement can provide for a stronger type of engagement between the cap and the building formwork component (e.g. the engagement portions of the cap and component can be designed to robustly interlock). This can provide a relatively rigid connection between the cap and the 2024204072   14 Jun 2024 building formwork component (i.e. so as to better resist disconnection due to bowing, blowout, etc.). Alternatively or additionally, the first and second cap engagement portions may be configured for snap engagement with the first and second corresponding 5 engagement portions of the building formwork component. This can allow the cap to be engaged with the building formwork component by way of lateral movement (e.g. the cap may be pressed or pushed so as to snap onto the component). For example, where one or both of the cap and building formwork component have a substantial length, the lateral movement of the cap to snap onto 10 the component can avoid the need to position one e.g. above the other in order to slide them together. However, the resultant interlock between the cap and component may not be as robust as the slide-together configuration. In one embodiment the first and second cap engagement portions may each comprise a longitudinal groove. Each groove may be configured for receipt of a 15 flange of a first or second corresponding engagement portion of the building formwork component. In another embodiment, the first and second cap engagement portions may instead comprise flanges for receipt in corresponding grooves of the building formwork component. In a further embodiment, one of the cap engagement portions may comprise a flange, and the other of the cap 2 0 engagement portions may comprise a groove, and these may respectively be received in or receive a corresponding groove and a corresponding flange of the building formwork component. In one embodiment the outer skin of the cap may comprise two spaced walls. When the cap is viewed in profile, the two spaced walls may comprise long walls 2 5 that extend between opposing end walls of the cap (i.e. the spaced walls may generally extend between the first and second edges of the cap portion). The spaced walls may be parallel. The spaced walls may be planar, or may be arcuate, or may have other suitable profiles. For example, an outer wall of the two walls 2024204072   14 Jun 2024 (e.g. when the cap is engaged with the component) may have an arcuate profile, whilst an inner wall of the two walls may have a linear profile. In one embodiment the internal reinforcement structure may comprise a plurality of webs extending between the spaced walls of the outer skin. The webs can 5 function to strengthen the cap, whilst maintaining a substantially hollow, lighterweight cap. In one embodiment, at least some of the plurality of webs may extend generally perpendicularly to the spaced walls of the outer skin. In this or another embodiment, at least some of the plurality of webs may extend diagonally 10 between the spaced walls of the outer skin. Thus, the internal reinforcement structure may comprise a combination of perpendicular and diagonal webs. For example, in one embodiment the internal reinforcement structure, together with the two spaced walls of the outer skin, may define a truss. A truss is typically a particularly strong and / or rigid yet lightweight structure, which can 15 help to reduce or prevent bowing, etc. of the cap in use. In one embodiment the cap may be of a unitary structure. This can increase the strength of the cap. This can also mean that the cap does not require any separate assembly. In one embodiment the cap may be formed of plastic (e.g. PVC). In one 2 0 embodiment the building formwork component may be formed of plastic (e.g. PVC). When formed of plastic, each of the cap and component may be moulded -e.g. extruded. This can provide a cost-effective way of forming each of the cap and component. In another embodiment the cap may be defined by a conventional building 2 5 material, being a material that is capable of resisting deflection when located between the first and second corresponding engagement portions of the building formwork component. For example, the building material may comprise a slab, 2024204072   14 Jun 2024 sheet or panel of the material. Further, the building material may comprise one of: fibre cement that is optionally compressed, autoclaved aerated concrete (AAC), reinforced (e.g. fibre-reinforced) plasterboard, etc. Making use of such a building material can also provide a cost-effective way of forming the cap. 5 Also disclosed herein is a building formwork system. The system comprises a building formwork component, such as that set forth above. For example, the building formwork component can comprise walls that define a cavity for receipt of a cementitious material therein. The building formwork component can also comprise first and second corresponding engagement portions. 10 The system also comprises a cap, such as that set forth above. For example, the cap can be configured to be retained by the first and second corresponding engagement portions of the component. The cap can be further configured such that, in use, it is able to resist deflection intermediate the first and second corresponding engagement portions of the component, with the attendant 15 advantages as outlined above. For example, such a system can allow e.g. loadbearing columns and walls to be constructed. As above, the building formwork component employed in the system can be moulded (e.g. extruded) from a plastic material (e.g. PVC). However, in the system, the cap can either be moulded (e.g. extruded from plastic) or may be 2 0 defined by conventional building material that is capable of resisting deflection (e.g. a fibre cement panel, etc.), such as that set forth above. In one embodiment of the system, each corresponding engagement portion of the building formwork component may be arranged at a respective wall (i.e. sidewall) of the building formwork component. As a result, the sidewalls and corresponding 2 5 engagement portions can define a space therebetween. Further, the cap may be configured to locate in this space so as to extend between and be retained by the first and second corresponding engagement portions of the component. As set forth above, the cap may be configured to substantially fill the 2024204072   14 Jun 2024 space defined between the sidewalls and corresponding engagement portions of the component. As set forth above, this space may also be in part defined by an end web of the building formwork component. As set forth above, the filling of the space with the cap may further increase the rigidity of the building formwork 5 system (e.g. when employed to form a column or wall). In the system as disclosed herein, the building formwork component and / or cap may be as otherwise defined as above. Also disclosed herein is a building formwork connector. The connector can be used to connect two (e.g. like) building formwork components, each of which 10 may be as set forth above. For example, each component can be of a type that comprises walls that define a cavity for receipt of a cementitious material therein. The connector can be used to connect the two building formwork components in a “back-to-back” arrangement (e.g. to reverse the orientation of adjacent components). Thus, once the two components are so connected, an end of one of 15 the two components can be connected to a cap (such as set forth above), and an end of the other of the two components can be connected to another such cap, or the end may be connected to another (e.g. like) building formwork component. In this way, a column, wall, etc. can be constructed that can be “capped” at each end. In an embodiment, when the connector is viewed in end profile, it can be seen to 2 0 comprise a web that extends between two flanges. Each flange may comprise first and second longitudinally extending edges. Each edge may be turned inwardly to define first and second lips. The flanges may be connected to a respective end of the web at respective intermediate flange locations (i.e. between their respective first and second lips). 2 5 Typically, the connector is elongate. Further, the connector may generally be I-shaped in end profile. In this regard, the connector may be considered to be a type of “I-beam”, with the web defining a stem of the “I” and the flanges respectively defining the top and bottom of the “I”. 2024204072   14 Jun 2024 In an embodiment, each pair of first lips and each pair of second lips of the connector may be configured for slideable engagement with a corresponding pair of grooves formed in a respective building formwork component (the grooves may be arranged as set forth above). 5 Alternatively or additionally, each pair of first lips and each pair of second lips of the connector may be configured for snap engagement with a corresponding pair of grooves formed in a respective building formwork component (the grooves may be arranged as set forth above). In an embodiment, when the connector is viewed in end profile, an outer surface 10 of each lip may define either generally a right angle (e.g. for a slide-together setup), or a generally acute angle (e.g. for a slide- or snap-together setup), with respect to a remainder of the flange. Also disclosed herein is a building formwork system that can comprise a connector as set forth above. The building formwork system can also comprise at 15 least one building formwork component (e.g. as set forth above) that comprises walls that define a cavity for receipt of a cementitious material therein. The at least one building formwork component can further comprise first and second corresponding engagement portions. Each corresponding engagement portion can be arranged for engaging with a respective pair of first lips or second lips of the 2 0 connector. Also disclosed herein is a building formwork system comprising a building formwork component (e.g. as set forth above). The walls of the component can define a cavity for receipt of cementitious material therein. A first engagement portion of the component can be configured according to a first connector type. A 2 5 second engagement portion of the component can be configured according to a second connector type. The system can further comprise a building formwork connector (e.g. as set forth above). The connector can comprise first and second sides. Each of the first and second sides of the connector can be configured according to the first connector type. In the system, the first connector type and 2024204072   14 Jun 2024 second connector type are configured for engagement with one another (e.g. via one or both of slideable engagement or snap engagement). The first connector type may, for example, be a male connector. The second connector type may, for example, be a female connector. However, it should be 5 appreciated that other connector types are envisaged, such as where one connector engages with another (i.e. of a different form), and such as where each connector comprises a hooking arrangement. As set forth above, the connector can allow the orientation of a building formwork component to be reversed in a system that comprises multiple building formwork 10 components. This can increase the versatility of the system, and may allow a larger number of arrangements to be formed with only the addition of the building formwork connector. It can also allow for opposing ends of a column or wall to be capped, as set forth above. In one embodiment of the system, the building formwork component may 15 comprise first and second ends. The first end may comprise the first engagement portion configured to the first connector type. The second end may comprise the second engagement portion configured to the second connector type. This can allow for (e.g. like) building formwork components to be joined end-to-end. It can also allow for the second ends of adjacent components to be joined to the 2 0 connector. In one embodiment the system may further comprise a building formwork cap as set forth above. In this regard, the first and second engagement portions of the building formwork cap may be configured according to the second connector type. The use of a building formwork connector in the system may allow for two 2 5 building formwork caps of the same type to be used at opposite ends of e.g. a structure formed using the building formwork components. In other words, where the building formwork caps are only able to engage with the flange end of a building formwork component, the building formwork 2024204072   14 Jun 2024 connector may allow the reversal of a building formwork component so that the flange end (that would otherwise be connected to an adjacent formwork component) becomes free for engagement with the building formwork cap. This can allow the formwork to be used to construct columns, pillars, pedestals, plinths 5 and the like (i.e. capped at either side / end thereof). Brief Description of the Drawings Embodiments will now be described by way of example only, with reference to the accompanying drawings in which: Figure 1A is a top end (profile) view of a building formwork system, in 10          the form of a column; and Figure IB is a perspective view of the building formwork system of Figure 1A; and Figure 2 is an isometric detailed view of an upper portion of a connector of the building formwork system; and 15          Figure 3 is a top end (profile) view of a building formwork cap; and Figure 4A is a top end (profile) view of a building formwork component for use in e.g. the system of Figure 1A; and Figure 4B is a top end (profile) view of the building formwork component of Figure 4A, but with another cap type connected thereto; and 2 0          Figure 5 is an end view of an upper portion of the building formwork component of Figure 4 A; and Figure 6 is a perspective view of the building formwork component of Figure 4A. 2024204072   14 Jun 2024 Detailed Description In the following detailed description, reference is made to accompanying drawings which form a part of the detailed description. The illustrative embodiments described in the detailed description, depicted in the drawings and 5 defined in the claims, are not intended to be limiting. Other embodiments may be utilised and other changes may be made without departing from the spirit or scope of the subject matter presented. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the drawings can be arranged, substituted, combined, separated and designed in a 10 wide variety of different configurations, all of which are contemplated in this disclosure. Figures 1A & IB show a building form work system, which takes the form of a column 100. The building formwork system can, alternatively, take the form of a wall, plinth, pillar, pedestal, etc. 15 The building formwork system 100 comprises at least one building formwork component 102 (see also Figure 4A) and, in this embodiment, comprises three building formwork components 102a, 102b, 102c. The building formwork system 100 also comprises a building formwork connector 204 (see also Figure 2). The connector 204 connects together two of the building formwork components 102a, 2 0    102b. The building formwork system 100 further comprises at least one building formwork cap 306 (see also Figure 3) and, in this embodiment, comprises two building formwork caps 306a, 306b. The caps 306a, 306b are connected at opposite sides of the column 100. Each of these components of the system is described in more detail below. 2 5 The three components 102a, 102b, 102c are generally identical with one another (i.e. each typically has the form as shown in Figure 4A). Each building formwork component 102a, 102b, 102c comprises two spaced parallel (and generally coextensive) sidewalls 108. Three webs 110a, 110b, 110c extend between these sidewalls 108. A first web 110a extends across a first end of the sidewalls 108, a 2024204072   14 Jun 2024 second web 110b extends across an opposite (second) end of the sidewalls 108, and a third web 110c extends between the sidewalls 108 intermediate the first 110a and second 110b webs. Although three webs 110a, 110b, 110c are shown in each building formwork component 102a, 102b, 102c of the illustrated 5 embodiment, it should be appreciated that each building formwork component may have more (e.g. 4, 5, 6) or less (e.g. 1, 2) webs. As best shown in Figures 5 & 6, each of the webs 110 includes a plurality of generally rectangular apertures 113 that allow a cementitious material to flow across the webs 110. The apertures 113 also allow for the receipt of 10 reinforcement bars in and extending through the components 102a, 102b, 102c. As is apparent from the Figures, the webs 110a, 110b, 110c are integral with the sidewalls 108. In the presently described embodiment, the components 102a, 102b, 102c are each moulded (e.g. extruded from plastic) so as to provide the component with an integral (or unitary) structure. 15 At their respective first ends, the sidewalls 108 of each component 102a, 102b, 102c comprise a longitudinal groove 112 formed therein. At their respective second ends, the sidewalls 108 each comprise an inwardly projecting and longitudinally extending flange 114. The grooves 112 and flanges 114 are formed so as to be complementary. The flanges 114 extend inwardly and on an incline to 2 0 their respective sidewalls 108 such that an outer surface of each flange 114 forms a sloped or inclined surface 115 (that forms an acute angle with the respective sidewall 108 - see Fig. 4A). In use, and as should be apparent from the figures, the flanges 114 of one component 102a, 102b, 102c can be received in the grooves 112 of another component 102a, 102b, 102c in order to secure the 2 5 components 102a, 102b, 102c together. Due to their complementary shape, the flanges 114 closely or snugly fit within their respective grooves 112 so as to minimise movement between the components 102a, 102b, 102c once engaged. The engagement of the flanges 114 and the grooves 112 can be performed in two ways. Firstly, one component 102a, 102b, 102c can be positioned above the 2024204072   14 Jun 2024 other, and can then be moved along the longitudinal axis of the components 102a, 102b, 102c so as to slide the flanges 114 into the grooves 112 (i.e. so as to slideably engage the components 102a, 102b, 102c). Alternatively, the components 102a, 102b, 102c may be snap-engaged by moving 5 one of the components 102a, 102b, 102c towards another component in a lateral direction. In this case, the sloped surfaces of the flanges 114 of one building formwork component 102a, 102b, 102c contact an end of another building formwork component 102a, 102b, 102c, which causes the flanges 114 (and adjacent portions of the sidewalls 108) to move outwardly, due to the sloped (i.e. 10 ramp) surfaces 115 on the flanges 114. As the building components 102a, 102b, 102c are moved further towards one another, the flanges 114 of one building component 102a, 102b, 102c ‘snap’ into the grooves 112 of the other building component 102a, 102b, 102c so as to be engaged with one another. A building formwork cap 306 is shown in more detail in Figure 3, which shows 15 the cap from the top end (i.e. in profile). This cap 306 is identical to those shown in Figures 1A and IB. The cap 306 comprises a cap portion 316 and first 318a and second 318b engagement portions. Like the components 102a, 102b, 102c, the cap 306 is a unitary structure that may be moulded (such as by extrusion - e.g. extruded from PVC). The engagement portions 318a, 318b comprise grooves 320 2 0 of a similar form to those present in the components 102a, 102b, 102c (described above). In this respect, the grooves 320 are configured for receipt of the flanges 114 of the components 102a, 102b, 102c, either by way of snap engagement or by way of sliding engagement as described above. This is apparent from Figures 1A and IB in which caps 306a, 306b are shown engaged with the flanges 114 of two 2 5 of the components 102a, 102c. The cap portion 316 generally extends between the first 318a and second 318b engagement portions and comprises an outer skin 322 and an internal reinforcement structure. 324. The outer skin 322 comprises two generally parallel spaced walls 326. The internal reinforcement structure 324 comprises a plurality 2024204072   14 Jun 2024 of webs 328, 330. A first set of the webs 328 extend generally perpendicular to, and between, the sidewalls 326. A second set of the webs 330 extend diagonally between the sidewalls 326, and between the ends of the perpendicular webs 328 in an alternating manner (i.e. so as to form a zig-zag pattern). In this way, recesses 5 having generally triangular profiles are defined between the sidewalls 326, perpendicular webs 328, and diagonal webs 330. In effect, the combination of the sidewalls 326 and webs 328, 330 forms a truss that provides rigidity or stiffness to the cap 306 in use. Figures 1A and IB show two caps 306a, 306b engaged (by sliding or snap 10 engagement) with respective ends of two components 102a, 102c, such that the cap portion 116 of each cap 306a, 306b extends across the end of the respective component 102a, 102c between the sidewalls 108 (i.e. so as to cap the components 102a, 102c). The ability to snap or slideably engage the cap 306a, 306b simplifies its use in the building formwork system 100, and minimises the 15 tools and hardware required to install the cap 306a, 306b. When engaged in this way, an outer sidewall 126 of the cap portion 116 provides an end surface for the assembled formwork system 100. End walls of each cap 306a, 306b are generally flush with the outer surfaces of the sidewalls 108 of the components 102a, 102c, so as to create a generally continuous surface (i.e. a rectangular column). In this 2 0 way, the outer surface of the building formwork system 100 may be suitable for use without applying a further finishing surface. As should be apparent from the figures, the caps 306a, 306b are generally symmetrical about a lateral axis. This means that the caps 306a, 306b can be slideably engaged with respective components 102a, 102c in two orientations (i.e. 2 5 the caps 306a, 306b can be slideably engaged when ‘upside down’). In practice, this facilitates faster construction using the system 100. Referring now to Figure 4B, an alternative cap 350 is shown. The cap 350 is formed from a conventional building or construction material such as a slab, sheet or panel of this material. The material that is selected for cap 350 is capable of 2024204072   14 Jun 2024 resisting deflection (e.g. from the hydraulic pressure applied to the cap 350 in use by a cementitious material (e.g. concrete) poured into the adjacent component 102). The slab, sheet or panel for the cap 350 is sized such that it is able to be closely or snugly located between the sidewalls 108 adjacent to the flanges 114. 5 As can be seen in Figure 4B, the cap 350 sits behind the sloped surfaces 115 of the flanges 114 and is retained captive thereby. The material for the cap 350 can comprise one of: compressed fibre cement, autoclaved aerated concrete (AAC), reinforced (e.g. fibre-reinforced) plasterboard, or other like, suitable building materials. Such a material can provide a simple and cost-effective way of forming 10 and supplying the cap. A building formwork connector 204 is shown in more detail in Figure 2. The connector 204 comprises a central web 232 and two generally parallel and opposing flanges 234. Again, the connector 204 is elongate and integrally formed, and may be moulded (e.g. extruded) from plastic (such as PVC). The 15 web 232 is generally planar and elongate and, like the webs 110 of the building components, includes a plurality of apertures 233 formed therein. The web 232 also comprises two longitudinal edges 236, with each of the two flanges 234 being connected to a respective longitudinal edge 236 of the web 232. In particular, each flange 234 is connected to the web longitudinal edge 236 at a central portion 2 0 of the flange 234 (i.e. at an intermediate location along its length). This gives the connector 204 a generally T shaped profile (i.e. the connector 204 is a form of I-beam). Each edge 236 of the flanges is turned inwardly so as to define a lip 238. Each of these lips 238 has the same form as a flange 114 of the building formwork components 102a, 102b, 102c. 2 5 In this way, and as shown in Figures 1A and IB, the connector 204 can be connected, on a first side, to a building formwork component 102a by way of locating its inwardly extending first side lips 138 in the grooves 112 of the component 102a. The connector 204 can also be connected to a further building formwork component 102b, on a second side, by engagement of its second side 2024204072   14 Jun 2024 lips 138 with the grooves 112 of the further component 102b. Again, this connection may be by way of a slideable or snap-engagement. In practice, the building formwork connector 204 allows a user to use one type (i.e. having a particular connection type) of building formwork component 102 in 5 an assembly. In other words, the connector 204 allows the reversal of the orientation of a building formwork component 102. This also means that the same cap type 306a, 306b can be used at each end of the assembly. In this case, the cap 306a, 306b has a female-type (i.e. groove) connection and the connector 204 has a male type (i.e. flange) connection. As should be apparent to the skilled person, 10 this arrangement can be reversed and the same outcome can be achieved. Also, as should be apparent to the skilled person, the cap 306 or 350 can be connected to a given first or second side of connector 204. In the presently illustrated embodiments, the building formwork components 102a, 102b, 102c, building formwork caps 306a, 306b, 350 and building 15 formwork connector 204 have been arranged and engaged with one another in order to provide formwork for a column structure. Once the components of the system 100 are engaged with one another (as shown in the figures), a cementitious material, such as concrete, can be received in the assembly to form a column. It should be apparent, however that the system 100 can be used to form other 2 0 structures, such as walls, plinths, pylons, pillars, pedestals, etc. Because significant quantities of concrete can be required for the construction of columns (or other load bearing structures), a large amount of hydraulic pressure can be applied to various sidewalls of the building formwork system 100. The reinforcement / reinforced structure of the caps 306a, 306b, 350 ensures that any 2 5 bowing (i.e. due to hydraulic pressures) of the caps 306a, 306b, 350 is minimal. In the illustrated embodiments, there is no gap present between the caps 306a, 306b, 350 and the webs 110b of the respective components 102a, 102b, 102 they are engaged with, such that each cap 306a, 306b, 350 general fills a space defined between the sidewalls 108, flanges 114 and end web 110b of the respective 2024204072   14 Jun 2024 building formwork component 102a, 102b, 102. In this way, the building formwork caps 306a, 306b, 350 effectively provide a supporting function, in that they act to reduce bowing of the respective webs 110b they are adjacent to when assembled. 5 Variations and modifications may be made to the parts previously described without departing from the spirit or ambit of the disclosure. For example, the building formwork caps are illustrated and described as having grooves for engagement with a building formwork component. However the engagement portions of the building formwork caps may take other forms, 10 depending on the form of the building formwork component they are intended to engage with. In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an 15 inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the cap, system and connector.

Claims

1. A building formwork cap for capping a building formwork component of the type that comprises walls that define a cavity for receipt of a cementitious material therein, the building formwork cap comprising:first and second engagement portions, each for engaging corresponding first and second engagement portions of the building formwork component;a cap portion extending between the first and second engagement portions, the cap portion being configured such that it is able to resist deflection intermediate the first and second engagement portions.

2. A cap according to claim 1 wherein the cap portion is configured to resist deflection via an outer skin and an internal reinforcement structure.

3. A cap according to claim 2 wherein the outer skin comprises two spaced walls, each generally extending between the first and second engagement portions of the cap.

4. A cap according to claim 3 wherein the internal reinforcement structure comprises a plurality of webs extending between the two spaced walls of the outer skin.

5. A cap according to claim 4 wherein at least some of the plurality of webs:- extend generally perpendicularly to the two spaced walls of the outer skin; and / or- extend diagonally between the two spaced walls of the outer skin.

6. A cap according to any one of claims 2 to 5 wherein the outer skin together with the reinforcement structure comprise a truss.2024204072   14 Jun 20247. A cap according to any one of the preceding claims that is generally defined as an elongate section, wherein each of the first and second engagement portions of the cap extends for the length of the cap elongate section at respective first and second longitudinal sides thereof.

8. A cap according to claim 7 wherein each of the first and second engagement portions of the cap comprises a longitudinal groove that extends along and adjacent to an edge of a respective longitudinal side of the cap elongate section, each groove for receipt of a respective flange, each flange forming a part of the first or second corresponding engagement portions of the building formwork component.

9. A cap according to any one of the preceding claims that is configured to engage with the first and second corresponding engagement portions of the building formwork component which are disposed at the ends of respective spaced sidewalls of the building formwork component such that, when the cap is engaged to the building formwork component, the cap portion is able to span a gap defined between said spaced sidewalls.

10. A cap according to any one of the preceding claims wherein the first and second engagement portions of the cap are configured for:- slideable engagement with the first and second corresponding engagement portions of the building formwork component;- snap engagement with the first and second corresponding engagement portions of the building formwork component.

11. A cap according to any one of the preceding claims that is a unitary structure such as may be moulded such as by being extruded from plastic.

12. A building formwork system comprising:2024204072   14 Jun 2024- a building formwork component that comprises walls that define a cavity for receipt of a cementitious material therein, and first and second corresponding engagement portions;- a cap configured to be retained by the first and second corresponding engagement portions of the component, the cap being further configured such that, in use, it is able to resist deflection intermediate the first and second corresponding engagement portions of the component.

13. A system according to claim 12 wherein each corresponding engagement portion is arranged at a respective sidewall of the building formwork component, whereby the sidewalls and corresponding engagement portions define a space therebetween, and wherein the cap is further configured to locate in the space so as to extend between and be retained by the first and second corresponding engagement portions of the component.

14. A system according to claim 13 wherein the cap is configured to substantially fill the space defined between the sidewalls and corresponding engagement portions of the component.

15. A system according to any one of claims 12 to 14 wherein the cap is otherwise as set forth in any one of claims 1 to 11.

16. A system according to claim 13 or 14 wherein the cap comprises a building material that is capable of resisting deflection when located between the first and second corresponding engagement portions of the component.

17. A system according to claim 16 wherein the building material comprises a slab, sheet or panel and optionally the material comprises fibre cement such as compressed fibre cement.

18. A building formwork connector for connecting two building formwork components, each component of the type that comprises walls that define a cavity for receipt of a cementitious material therein, the building formwork connector2024204072   14 Jun 2024when viewed in end profile comprising a web that extends between two flanges, each flange comprising first and second longitudinally extending edges that are turned inwardly to define first and second lips, with the flanges connected to a respective end of the web at respective intermediate flange locations between their respective first and second lips.

19. A connector according to claim 18 wherein each pair of first lips and each pair of second lips is configured for:- slideable engagement with a corresponding pair of grooves formed in a respective building formwork component;- snap engagement with a corresponding pair of grooves formed in a respective building formwork component.

20. A connector according to claim 18 or 19 wherein, when viewed in end profile, an outer surface of each lip defines generally a right angle or a generally acute angle with respect to a remainder of the flange.

21. A connector according to any one of claims 18 to 20 wherein the connector is generally I-shaped in end profile.

22. A building formwork system comprising:- a connector as set forth in any one of claims 18 to 21;- a building formwork component that comprises walls that define a cavity for receipt of a cementitious material therein, and first and second corresponding engagement portions, each corresponding engagement portion arranged for engaging with a respective pair of first lips or second lips of the connector.

23. A building formwork system comprising:- a building formwork component that comprises:2024204072   14 Jun 2024walls that define a cavity for receipt of a cementitious material therein; anda first engagement portion configured according to a first connector type; anda second engagement portion configured according to a second connector type; and- a building formwork connector comprising first and second sides, each of the first and second sides being configured according to the first connector type;wherein the first connector and second connector types are configured for engagement with one another.

24. A system according to claim 23 wherein the first and second connector types are configured for one or both of slideable engagement or snap engagement.

25. A system according to claim 23 or 24 wherein the building formwork connector is as set forth in any one of claims 18 to 21.

26. A system according to claim 25 wherein the first connector type comprises the first and second pairs of lips of the building formwork connector as set forth in any one of claims 18 to 21.

27. A system according to claim 25 or 26 wherein the first connector type provided on the first engagement portion of the building formwork component comprises a pair of lips, each lip turned inwardly from a respective sidewall of the building formwork component.

28. A system according to claim 27 wherein an outer surface of each lip forms a right angle or an acute angle with its respective sidewall.2024204072   14 Jun 202429. A system according to any one of claims 23 to 28 wherein the building formwork component comprises first and second ends, the first end comprising the first engagement portion configured to the first connector type and the second end comprising the second engagement portion configured to the second connector type.

30. A system according to any one of claims 23 to 29 wherein the second connector type comprises a corresponding pair of grooves formed in the building formwork component.

31. A system according to any one of claims 23 to 30 further comprising a cap as set forth in any one of claims 1 to 11, wherein the first and second engagement portions of the cap are configured according to the second connector type.

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