Patent Application
20190010715
The present disclosure relates to a formwork apparatus and brackets for use in a formwork apparatus. It also extends to apparatus for positioning an anchor for a construction member in a slab.
It also extends to a method of constructing a formwork apparatus for casting a slab and a method for positioning an anchor for a construction member in a slab.
The present disclosure relates particularly but not exclusively to a formwork apparatus and positioning apparatus for use in building a detached house having a concrete slab on ground construction.
The applicant has filed another application which was published by WIPO as WO 2014/02284 on 13 Feb. 2014 the entire contents of this specification are hereby directly incorporated into this specification by cross reference.
In the specification, the term “comprising” shall be understood to have a broad meaning similar to the term “including” and will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. This definition also applies to variations on the term “comprising” such as “comprise” and “comprises”.
Reference throughout this specification to ‘one embodiment’ or ‘an embodiment’ means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, the appearance of the phrases ‘in one embodiment’ or ‘in an embodiment’ in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more combinations.
One way to construct a building structure is by means of a slab on ground technique. This involves pouring or casting a concrete slab within a formwork arrangement that provides lateral retention to concrete poured into the formwork. The bottom of the formwork is formed by the ground which is shaped to form a suitable slab.
However, there are problems with inaccuracies in forming a slab. These can have a flow on effect to the above ground structure of the building which is built on the slab. For example, an upper surface of the slab may not be horizontal and the result of this may be that walls built up from the floor are not vertically extending, i.e. it is not plumb. Further, the dimensions and line of the perimeter of the slab formed by the formwork may be inaccurate and not be dimensioned with sufficiently high tolerance.
A further shortcoming of prior concrete slabs and the apparatus used to form the slabs is that no provision is made for anchoring of reinforcing bars. Consequently, it is necessary to drill into a formed concrete slab after it has set to define a receiving hole for a reinforcing rod for the super structure above the slab. This process is carried out by a tradesman on the building site. It will be appreciated that the positioning and general accuracy of the hole that is drilled for the rod is dependent on the skill and effort of the tradesman. In the applicant's experience, very often these holes are inaccurately positioned on the slab. Further, the holes that are drilled may not be finely dimensioned and therefore may not provide a strong anchoring of the member to the slab.
The problems in previously disclosed practice and structures result in significant inefficiencies in building structures. The disclosed apparatus and methods help overcome or ameliorate the shortcomings identified in the discussion above.
Any of the features described herein can be combined in any combination with any one or more of the other features described herein within the scope of the disclosure.
The reference to any prior art in this specification is not, and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge.
The present disclosure is directed to a formwork apparatus for casting a slab that is used to support a building from a settable material. The formwork apparatus may at least partially overcome at least one of the abovementioned disadvantages or provide the consumer with a useful or commercial choice.
According to one aspect of the disclosure, there is provided a formwork apparatus defining a formwork space for forming a slab, the apparatus comprising:
at least one lower formwork member and at least one upper formwork member;
a plurality of formwork brackets, each formwork bracket having a connection arrangement for operatively connecting the bracket to the lower and upper formwork members;
wherein the formwork brackets are configured to space the upper and lower formwork members a certain distance apart from each other along their length such that the formwork members extend parallel to each other along their length.
The connection arrangement may include a lower bracket clamp for clamping the formwork bracket to the lower formwork member, and an upper bracket clamp for clamping the formwork bracket to the upper formwork member.
The bracket may include a lower formwork portion having a lower formwork positioning surface for bearing up against the lower formwork member, and an upper formwork portion having an upper formwork positioning surface for bearing up against the upper formwork member, and the upper and lower formwork positioning surfaces extend parallel to each other.
The formwork apparatus may further include a bridge portion connecting the lower and upper formwork portions and the bridge portion may have a lower positioning surface that extends orthogonally to the positioning surfaces of the upper and lower formwork portions. The bridge portion may also have an upper surface that is positioned at or below the height of the upper formwork formation, e.g. so as not to project upwardly proud thereof.
The formwork apparatus may include a ground anchor for anchoring the apparatus to the ground.
The ground anchor may be detachably mounted to the formwork bracket.
In particular, the ground anchor may include an arm extending from the formwork bracket spaced above the arm, and a ground penetrating formation on the arm towards a distal end of the arm.
The formwork bracket may include a foot extending orthogonal to the upper and lower formwork members for resting on a surface, and the foot may include a ground engaging surface extending orthogonally to the formwork positioning surfaces of the lower and upper formwork portions.
The foot may further include an anchoring formation for anchoring the foot to a solid support. The solid support may typically be a footing, e.g. a concrete footing.
The foot may also include a ground anchor extending therefrom for anchoring the foot to the ground.
The formwork apparatus may further include an anchor positioner for positioning an anchor for a construction member in the formwork space. In particular, the anchor positioner may be used for positioning a construction member in a certain position or a predetermined position within the formwork space.
The anchor positioner may comprise at least one positioner body that interacts with the formwork bracket to locate the positioner body in the formwork space and also to support the positioner body.
The positioner body may comprise positioning formations integrally formed with the bracket and separate elements that are detachable for the bracket.
The positioner body may include a buttress for butting up against the upper formwork formation and positioning the positioner relative to the upper formwork member.
The positioner body may extend beneath the upper formwork member while being positioned adjacent to the upper formwork member. The positioner body may also extend beneath the bridge formation.
The anchor positioner may include at least one anchor locator for locating and positioning an anchor for a construction member.
The anchor positioner may include one said anchor locator positioned on one side of the upper formwork member and another said anchor locator on the other side of the upper formwork member.
Each anchor locator may include an opening formed in the positioner body.
The formwork apparatus may further include a construction member anchor mounted on an opening forming the anchor locator. If there are two anchor locators on the anchor positioner, a construction member anchor may be mounted on each anchor locator.
The construction member anchor may comprise an anchor body and a rod extending away from the anchor body.
The anchor body may comprise a long nut having an internal screw threaded bore extending there through and the rod may have an external screw thread at one end thereof, and the long nut and the rod may be operatively connected by screwing the external screw thread into the screw threaded bore.
The positioner body may include an arm extending from the formwork bracket, e.g. integrally formed with the bracket.
The positioner body may also include positioning formations projecting from the bracket in which the openings forming the anchor locators are formed.
The lower formwork member may include a first lower formwork channel having a lip defined in the lower formwork member, and a second lower formwork channel having a lip defined in the lower formwork member. The first and second lower formwork channels may extend parallel to a longitudinal edge of the lower formwork member, for mounting the formwork bracket to the lower formwork member.
The upper formwork member may include an upper formwork channel having a lip extending parallel to a longitudinal edge of the formwork member.
The lower formwork member may comprise a plurality of lower formwork elements that are connected to each other in series by means of at least one connector bracket.
The formwork apparatus may further include linear connector brackets for connecting the lower formwork elements in series.
The formwork apparatus may include corner connector brackets for connecting two lower formwork elements to each other such that they extend orthogonally to each other.
The corner connector brackets may include internal corner connector brackets and external corner connector brackets.
According to another aspect of the disclosure, there is provided an apparatus for positioning an anchor for a construction member in a slab, the apparatus including:
an anchor positioner that is mounted on a support proximate to a formwork apparatus defining a formwork space for casting a slab, the anchor positioner extending into the formwork space; and
an anchor locator mounted on the anchor positioner for locating a construction anchor in a position in the slab when it is formed.
The anchor positioner may extend into the formwork space and position the anchor locator spaced away from an edge of the formwork space. In particular, the position in the slab may be a very specific position, e.g. a predetermined position in the slab when it is formed.
The apparatus for positioning an anchor may include a mounting arrangement for mounting the anchor positioner on the formwork apparatus.
The apparatus for positioning an anchor may include at least one formwork member extending at least part of the way around the formwork space and having a channel on its outer surface. Further, the mounting arrangement may mount the anchor positioner on a said formwork member.
The apparatus may include a clamp for clamping the anchor positioner onto the channel of the formwork member at two vertically spaced positions.
The anchor locator may be formed by an aperture in the anchor positioner.
The apparatus may include a construction member anchor that is mounted on the anchor locator.
The construction member anchor may comprise an anchor body having a connecting formation for connecting a construction member thereto, and a rod extending away from the anchor body.
The rod may be curved along part of its length for increasing the anchoring thereof in the cast concrete. Further, the rod may extend down into the formwork space to key the anchor into the slab.
The connecting formation of the anchor body may comprise an internal passage having an internal screw thread formation for engaging an external screw thread on a construction member.
The construction member anchor may be mounted to the anchor locator formed by an aperture, by means of a fastening element that passes through the aperture of the anchor locator and screws into the internal passage of the connecting formation.
Alternatively, the construction member anchor may comprise two components that are connected to each other on either side of the aperture of the anchor locator whereby to mount the anchor on the anchor locator. For example, the anchor body may be positioned on one side of the aperture and the rod may be positioned on the other side of the aperture and the anchor body are connected to each other with the positioner body sandwiched between them.
The anchor positioner may have a plurality of anchor locators formed thereon that are spaced apart from each other. This holds the construction member anchor to the bracket.
The positioner body may comprise a bracket portion and a physically separate body portion that is tethered to bracket portion and thereby the bracket in use.
The bracket portion may form an aperture and the body portion may also form an aperture, and both apertures are aligned to form an anchor locator.
The physically separate body portion may remain permanently in the formed slab after the bracket has been removed.
In another form, the anchor positioner may include an arm extending from the formwork bracket and a bracket portion extending from the formwork bracket. The arm and the bracket portion may be integrally formed with the bracket and thus be removed from the formwork bracket when the formwork apparatus is removed.
Further, the positioner body may also have a formation, e.g. a transverse wall that interacts with the formwork bracket to position the positioner body relative to the bracket. Yet further, the positioner body may have a square end that butts up against the lower formwork member to position the positioner body relative to the bracket.
According to another aspect of the disclosure, there is provided a formwork bracket for mounting to lower and upper formwork members, the bracket including:
a lower formwork portion having a lower formwork positioning surface for bearing up against the lower formwork, and an upper formwork portion having an upper formwork positioning surface for bearing up against the upper formwork; and
a connection arrangement for operatively connecting it to the lower and upper formwork members, wherein the formwork bracket is configured to space the upper and lower formwork members a certain distance apart from each other along their length and extending parallel to each other along their length.
The connection arrangement may include a lower bracket clamp for clamping the formwork bracket to the lower formwork member.
The connection arrangement may include an upper bracket clamp for clamping to the upper formwork member.
The bracket may further include a bridge portion connecting the lower and upper formwork portions, the bridge portion having a lower positioning surface that extends orthogonally to the positioning surfaces of the upper and lower formwork portions.
The formwork apparatus may include a foot extending orthogonal to the upper and lower formwork members for resting on a support or on the ground and the foot may have a ground engaging surface extending orthogonally to the formwork positioning surfaces of the lower and upper formwork portions.
The formwork apparatus may further include an anchoring formation for anchoring the foot to a solid support, e.g. a footing.
The formwork apparatus may further include a ground anchor extending from the foot for anchoring in the ground.
According to another aspect of the disclosure, there is provided a ground positioning bracket for mounting to a formwork member, the bracket including:
a foot for running along a support surface, and
a leg extending orthogonally up from the foot, the leg having a clamp for clamping it to the formwork member.
The foot may include an anchoring formation for anchoring the bracket to a hard support, such as a concrete floor.
The foot may further include an attachment formation for fixing a ground penetrating formation to the foot for driving into the ground. Yet further, the bracket may include a ground penetrating formation with a sharp point.
According to another aspect of the disclosure there is provided a linear connector bracket for connecting two sections of formwork member to each other.
The linear connector bracket may include first and second portions that extend in a line.
The linear connector bracket may further include two clamps on each of the first and second portions for clamping the bracket to each of the two sections of formwork.
The disclosure extends to a formwork apparatus including at least two sections of formwork and a linear connector bracket fixedly connecting the sections of formwork to each other so they cannot pivot relative to each other.
According to yet another aspect of the disclosure, there is provided a corner connector bracket for connecting two sections of formwork member to each other so that they extend orthogonally to each other.
The corner connector bracket may include may include first and second portions that extend orthogonally to each other.
The first portion may form an open channel within which a formwork member is received.
The first portion may also include clamps for clamping the formwork member to the formwork member.
The second portion may include a plate extending orthogonally to the channel for clamping to an orthogonally extending formwork member.
According to another aspect of the disclosure, there is provided a formwork apparatus defining a formwork space for forming a slab on a support, comprising:
at least one lower formwork member and at least one upper formwork member;
a plurality of formwork brackets, each bracket having a connection arrangement operatively connecting it to the lower and upper formwork members; and
a plurality of ground positioning brackets operatively connected to the lower formwork members, each ground positioning bracket being anchored to the ground or a support surface to anchor the formwork on the support.
The formwork brackets and the ground positioning brackets may be arranged spaced apart along the length of the formwork members.
The formwork brackets may be alternated with the ground positioning brackets along the length of the formwork members.
This way the formwork brackets can be removed from a formed slab separate from the ground positioning brackets.
The formwork brackets can be removed first, e.g. together with the upper formwork member and the ground positioning brackets can be left in position to hold the formwork members and the slab in position on the ground.
The disclosure extends to a method of providing a formwork apparatus for forming a slab for a building, the method including:
forming a lower formwork member; and
forming an upper formwork member, the upper formwork member being positioned at a higher level than the lower formwork member and spaced inwardly of the lower formwork member.
According to another aspect of the disclosure, there is provided a formwork bracket for mounting to lower and upper formwork members, the bracket including,
a lower formwork portion having a lower formwork positioning surface for bearing up against the lower formwork, and an upper formwork portion having an upper formwork positioning surface for bearing up against the upper formwork; and
a connection arrangement for operatively connecting it to the lower and upper formwork members, wherein the formwork bracket is configured to space the upper and lower formwork members a certain distance apart from each other along their length and extending parallel to each other along their length.
The connection arrangement may include a lower bracket clamp for clamping the formwork bracket to the lower formwork member.
The connection arrangement may include an upper bracket clamp for clamping to the upper formwork member.
The bracket may further include a bridge portion connecting the lower and upper formwork portions, the bridge portion having a lower positioning surface that extends orthogonally to the positioning surfaces of the upper and lower formwork portions.
The formwork apparatus may include a foot extending orthogonal to the upper and lower formwork members for resting on a support or on the ground and the foot may have a ground engaging surface extending orthogonally to the formwork positioning surfaces of the lower and upper formwork portions.
The formwork apparatus may further include an anchoring formation for anchoring the foot to a solid support, e.g. a footing.
The formwork apparatus may further include a ground anchor extending from the foot for anchoring in the ground.
The apparatus may further include an anchor positioner for positioning an anchor for a construction member in the formwork space.
The bracket may include any one or more of the features of the lower and upper formwork members described in the preceding aspects of the disclosure discussed above.
According to another aspect of the disclosure, there is provided a method of providing a formwork apparatus within which a slab can be cast, the method including arranging at least one formwork member on a support surface on which a slab is to be formed to form a formwork apparatus defining a formwork space, and anchoring the formwork member in position on the ground.
Arranging at least one formwork member may include arranging a lower formwork member on a peripheral edge of the formwork space and arranging an upper formwork member spaced inward from the lower formwork member.
The method may include mounting a plurality of formwork brackets on the formwork members, each bracket extending from the lower to the upper formwork member to hold the lower and upper formwork members in a fixed spaced relation to each other.
Holding the lower and upper formwork members in a fixed spaced relationship to each other may include orienting the members parallel to each other and orthogonal to a line extending from the lower to upper formwork member.
Further, mounting the formwork brackets to the formwork members may include clamping the brackets to each of the upper and lower formwork members.
The formwork members may include open channels each having a lip, and clamping the brackets may include clamping the brackets to the channels on the upper and lower formwork members.
The method may further include mounting a plurality of ground positioning brackets to the lower formwork members.
The mounting may include clamping a plurality of ground positioning brackets to the lower formwork member.
The method may further include anchoring the ground positioning brackets in the ground or adjacent support surface.
Anchoring the ground positioning brackets in the ground may include operatively attaching a ground engaging formation to the bracket and then driving it into the ground.
The method may include positioning the formwork brackets at spaced intervals along the length of the lower formwork member, and also positioning the ground positioning brackets at spaced intervals along the lower formwork member.
Further, the positioning may include alternately placing formwork brackets and ground positioning brackets along the length of the lower formwork member.
The method may include clamping the brackets to the upper and lower formwork members in a pre-manufacturing step and supplying assembled units of brackets and formwork members to a construction site, then coupling the units to each other on site to form an assembled formwork apparatus. The method may then include fixing the ground positioning the ground engaging formations of the ground positioning brackets to the ground to anchor the apparatus.
Further, the method may include positioning an anchor for a construction member, e.g. a reinforcing rod or a construction brace, in a specific predetermined position in the formwork space.
The method may further include removing the formwork brackets after the slab has been cast while leaving the ground positioning brackets in place anchored in the ground.
The method may further include removing the upper formwork member when the formwork brackets are removed leaving the lower formwork member and the ground positioning brackets in place.
The formwork and positioning brackets may include any one or more of the features of the brackets described in any one of the preceding aspects of the disclosure.
According to another aspect of this disclosure, there is provided a method of providing an anchor for a construction member cast into a slab, the method including positioning a construction member anchor in a certain position within a formwork space, and pouring a settable material into the formwork space.
The method may include positioning the construction member in the certain position by means of an anchor positioner extending in from an edge of the formwork space.
The method may include mounting the anchor positioner directly or indirectly on a formwork apparatus, e.g. a formwork member, defining the formwork space.
The anchor positioner may include an anchor locator and the method may further include placing the locator in a position in the formwork space corresponding to a surface of the formed slab.
The method may include mounting a construction member anchor on or in the anchor locator.
The method may further include providing a rod on the construction member anchor for keying the anchor into the slab that is cast.
Further, the method may also include fixing a construction member to the construction member anchor after the settable material has set in the formwork space to form a slab.
According to another aspect of the disclosure, there is provided a slab formed in accordance with any one of the preceding aspects of the disclosure or using a formwork apparatus or bracket in accordance with any one of the preceding aspects of the disclosure.
According to another aspect of the disclosure, there is provided a building structure including a slab in accordance with the preceding aspect of the disclosure.
Preferred features, embodiments and variations of the disclosure may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the disclosure. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of Disclosure in any way. The Detailed Description will make reference to a number of drawings as follows:
In compliance with the statute, the disclosure has been described in language more or less specific to structural or methodical features. It is to be understood that the disclosure is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the disclosure into effect. The disclosure is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims (if any) appropriately interpreted by those skilled in the art.
The apparatus 10 comprises broadly a lower formwork member 12, an upper formwork member 14 and a plurality for formwork brackets 20. The upper and lower formwork members 14 and 12 extend parallel to each other and spaced away from each other. In particular, the upper formwork member 14 is spaced upward and inward of the lower formwork member 12. Each of the components will be described in more detail below.
The lower formwork member 12 is linear and has two major surfaces 22 and 24 extending between upper and lower longitudinal edges extending parallel to each other. In addition, the formwork member 12 has first and second formwork channels 26 and 28 defined in one of the major surfaces 22 thereof. The other major surface 24 is planar across its full face and faces into the formwork space where it provides retention. Each channel 26, 28 extends along the full length of the member 12. The first and second channels 26 and 28 are spaced apart from each other and spaced from the upper and lower longitudinal edges of the member 12. Further, each channel 26 and 28 has upper and lower lips 29 extending along its longitudinal edges for clamping to the brackets 20 as will be described in more detail below.
The upper formwork member 14 has two major surfaces 30 and 32 with upper and lower longitudinal edges that are linear and extend parallel to each other. Further, the upper formwork member 14 has a single channel 34 defined in one major surface 30 thereof. Similarly, the formwork member 14 defines lips 36 extending along each of longitudinal edges of the channel 34. The upper formwork member 14 is shorter or more compact in height than the lower formwork member 12 and it is also thinner.
Each formwork bracket 20 is configured to space the upper and lower formwork members 14 and 12 a certain distance apart from each other and extending parallel to each other. Each bracket 20 comprises a lower formwork portion 40, an upper formwork portion 42, and a bridge portion 44 connecting the upper and lower formwork portions 42 and 40. The lower formwork portion 40 has a lower formwork positioning surface 46 for butting up against the lower formwork member 12 and positioning it, and orientating it.
The formwork bracket 20 also has a lower clamp 50 on the lower formwork portion 40 for clamping the bracket 20 to the lower formwork member 12. The clamp 50 comprises complementary clamping formations 52 on either side of the lips 29 of the first channel 26 and a fastener 54 for moving the clamping formations 52 towards each other and clamping the lip 29 of the first channel 26 on the lower portion there between. The bracket 20 also includes a locking tab 58 projecting from the lower formwork portion 40 for projecting into the second channel 28 and locking the tab 58 to the formwork member 12.
The upper formwork portion 42 has an upper formwork positioning surface 49 for butting up against the upper formwork member 14 and positioning it, and orientating it. The bracket 20 also has an upper clamp 60 for clamping the bracket 20 to the channel 34 of the upper formwork member 14. The clamp 60 has the same features as the clamp 50 described above and functions in the same way. It will therefore not be described further in this description.
The formwork bracket 20 has a high level of dimensional tolerance to ensure the upper and lower bracket positioning surfaces 46 and 49 position the upper and lower formwork members 14 and 12 in the correct positions. Typically, the brackets 20 might be laser cut from sheet metal, e.g. sheet steel. In addition, the brackets 20 are designed with cut outs to reduce the weight of each bracket 20 while still retaining an appropriate mechanical strength.
The anchor positioner 70 functions to position one or more construction anchors 76 with high tolerance in a predetermined position within the formwork space and thereby within a resulting concrete slab formed in the formwork space. This results in an accurate positioning of a structural member such as a reinforcing bar on the slab as well as effective anchoring of the reinforcing bar to the slab.
The anchor positioner 70 includes an elongate substantially rectangular flattened positioner body 71 having two major surfaces. The body 71 may be formed from plastic or from a metal such as steel. The positioner body 71 has a formwork locator 73 intersecting with the upper formwork member 14 to locate the anchor positioner 70 in the predetermined position. In the illustrated embodiment, the formwork locator 73 is in the form of a wall positioned about midway along the length of the positioner body 71 extending transverse to the longitudinal axis of the body. In the illustrated embodiment, one anchor locator 72 is positioned in the lateral spacing between the upper and lower formwork members 14 and 12. Another anchor locator 74 is positioned on the opposite side of the upper formwork member 14 to the lower formwork member 12, i.e. it is inward of the upper formwork member with respect to the formwork space.
One end of the positioner body 71 adjacent the anchor locating formation 73 has chamfered corners. This feature helps to locate the positioner body 71 in its correct position relative to another positioner body 71 as will be described in more detail below. The anchor positioner 70 is left in the slab after the slab is poured and remains permanently in the slab.
In
Further, the bracket 20 in
The corner bracket 110 comprises a first formwork section receiving portion 112 and a transverse extending second formwork section abutting portion 114. The first formwork receiving portion 112 defines an open channel 116 for receiving a section of the lower formwork member 12 therein with some clearance. The first portion 112 also has two vertically spaced clamps 118 for clamping the bracket 110 to a section of the lower formwork member 12 extending in a first direction.
The second portion 114 also has two vertically spaced clamps 118 for clamping the second portion 114 to the adjacent section of lower formwork member 112 extending in a second direction that is transverse to said first direction. In the illustrated embodiment, the plate 114 extends out beyond both sides of the first formwork section receiving portion 112.
The second formwork receiving portion 114 comprises a plate extending laterally outward away from the first portion 112 transverse thereto. The plate of the second portion 114 is for butting up against a section 119 of the lower formwork member 12 extending in a second direction.
The formwork bracket 20 is mounted to each of the lower and upper formwork members 12 and 14 in the manner described above, and illustrated in
The positioner 70 has two anchor locators 72 and 74 in the form of apertures extending through the flattened positioner body 71 spaced apart from each other on the body 71. A construction member anchor 76 is mounted on the anchor locator 72 intermediate the lower and upper formwork members 12 and 14. The anchor 76 includes an anchor body, e.g. a long nut, having a passage therethrough with an internal screw thread formation. An anchor rod 81 that is typically bent at a point along its length is screwed into the lower end of the anchor body 78. The bridging portion 44 has an opening formed therein which is located at a certain position. Further, the positioner body 71 also has an anchor locator 72 that is an opening or aperture formed therein that is aligned with an opening on the bridging portion 44. A nut 62 is passed through these openings into an upper end of the anchor body 71 thereby fixing the anchor rod 81 and anchor body 78 to the positioner body 71 and the bracket 20.
A second construction anchor 76 is mounted on the anchor locating formation 73 remote from the lower formwork member 12. This anchor 76 comprises an anchor body 78 mounted on top of the positioner body 71 and a rod 81 with a bend along its length that is positioned beneath the positioner body 71. The rod 81 is passed through the anchor locator 72 and is screwed into a lower end of the body 78. This fixes the rod 81 to the anchor body 78 and thereby also the positioner body 71 which is sandwiched between the rod 81 and the anchor body 78.
The ground positioning bracket 150 comprises a foot 152 for running along a support surface such as the ground and a leg 154 extending orthogonally up from the foot 152. The foot 152 has a connection arrangement comprising two vertically spaced connectors for connecting the ground positioning bracket 150 to the channels 26, 28 on the lower formwork member 12. In the illustrated embodiment, the upper connector is a clamp 50 like that on the formwork bracket 20 and the lower connector is a locking tab 48 again like that on the formwork bracket 20.
As described, the slab 140 has two levels with a lower level 144 around the perimeter of the slab 140 and an inner upper level 142. Further, the slab 140 has a rectangular configuration in outline with square corners. The formwork apparatus 10 comprises broadly the arrangement of lower and upper formwork members 12, 14 interconnected by a plurality of spaced brackets.
The formwork brackets 20 described above are located at spaced intervals around the perimeter of the slab 140. Each of these formwork brackets 20 is mounted to each of the lower and upper formwork members 12, 14 in the manner described above. Further, each of the brackets 20 is anchored in the ground by means of pegs.
Further, a plurality of ground positioning brackets 150 are also positioned at spaced intervals around the perimeter of the slab 140. In the illustrated embodiment, the ground positioning brackets 150 alternate with the formwork brackets 20 around the perimeter of the slab 140. The ground positioning brackets 150 assist in anchoring the formwork members 12 and 14 in position on the ground such that they can withstand the outward force of concrete being poured into the formwork apparatus 10. Further, the corner brackets 110 are shown in use on external corners as shown in
In an alternative embodiment, the formwork bracket 20 may have a foot and portions 42 and 44 of the bracket are detachably mounted to the lower formwork portion 40. In this embodiment, portions 42 and 44 can be removed from the lower formwork portion 40 such that the lower formwork portion 40 can be removed later, once the concrete has cured completely.
In these drawings, there are two construction member anchors 76 set and anchored into the upper level of the slab 140. The construction member anchors 76 are positioned a specific distance in from the edge of the upper level of the slab 140 and at a predetermined angle to each other. These construction anchors 76 are formed by an arrangement of brackets 20 and 150 like that shown in
In
Further, a single construction member anchor 76 is located on the lower level of the slab 140, the height of which is set by the lower formwork member 12. In
The drawing shows the anchor positioners 70 retained in position within the slab 140. The positioners 70 are positioned in the slab 140 in each of the positions in which a formwork bracket 20 was positioned. The body 71 of each positioner 70 extends along the surface of the lower level 144 of the slab 140 between the lower and the upper formwork members 12 and 14 but is spaced beneath the surface of the upper level 142 of the slab 140.
In the illustrated embodiment, the construction positioners 70 on the upper level 142 of the slab 140 have temporary construction braces 170 fixed thereto. By contrast the construction member anchors 76 on the lower level 144 of the slab 140 have reinforcing bars or reinforcing rods 172 operatively connected thereto. Only one reinforcing rod 172 is shown in the drawing for clarity but in practice reinforcing rods 172 might be connected to the other construction member anchors 76 on the lower level 144.
The technique of receiving and encasing construction anchors 76 for the reinforcing bars 172 in situ within the slab 140 when it is poured ensures that the bars 172 are properly anchored to and supported by the slab 140. With this construction, there is no requirement for the builders to drill holes into the concrete for receiving reinforcing bars 172 after the slab is poured.
The formwork bracket 180 comprises a lower formwork portion 40 that is similar to the first embodiment and an upper formwork portion 42 that is joined to the lower formwork portion 40 by a bridging portion 44. Each of the upper and lower formwork portions 42 and 40 has clamps 50 for clamping the bracket 20 to the upper and lower formwork members 14 and 12 respectively. The upper formwork portion 42 projects up above the level of an upper edge of the upper formwork member 14 which is different to the formwork bracket 20 in
Further, the formwork bracket 180 also includes a foot 182 extending away from a base of the lower formwork portion 40 transverse to a surface of the lower formwork portion 40. The foot 182 has a tab 184 extending away therefrom with a hole defined therein for passing an anchoring element there through, e.g. a DYNABOLT, for anchoring the bracket 180 to a support. The foot 182 also has attachment formations 186 for attaching a ground penetrating formation with a sharp point thereto.
The formwork bracket 180 has two anchor positioners 70 for positioning an anchor 76 for a construction member 170, 172 in a formed slab 140. As described above, using the bracket 20, the one anchor positioner includes the arm 181 that extends above the upper formwork member 14 and across the formwork space. The positioner 70 includes a tab towards a remote end thereof that defines an opening that forms an anchor locator 72. Additionally, the bridge portion 44 includes a tab that projects transverse away therefrom that also forms a further anchor locator 74. Thus, the bracket 180 has one anchor locator 72 at an end of the arm 181 and a further anchor locator 74 formed in a tab 189 on the bridge portion 44.
However, one feature of this formwork bracket 180 is that when a slab is formed in the formwork space, the arm 181 of the bracket encroaches on and occupies the space above the surface of the slab and the space around its peripheral edge of the slab is obstructed. This is inconvenient for builders working on the slab.
Each anchor locator 72, 74 is in the form of an aperture through which the construction member anchor 76 is passed. Each construction member anchor 76 is shown extending down into the slab 140 and is encased in concrete of the poured slab. Each construction member anchor 76 is similar to the construction anchor described above, with reference to
It will be further appreciated that forming the anchors within the slab when it is cast saves considerable labour and therefore cost. Further, by accurately positioning the anchors relative to the formwork members with a fine tolerance, the anchors are in an absolute optimum position. The accurate positioning of reinforcing rods leads to an overall better structure.
An advantage of the apparatus described in the detailed description above with reference to the drawings is that it enables an accurate and high tolerance slab to be formed for a building structure. The formwork members are accurately dimensioned on the ground and the brackets orientate the formwork space surfaces and thereby the formed slab surfaces in vertical and horizontal positions with a high degree of accuracy.
The formwork members are accurately dimensioned and positioned and have a vertically extending orientation. This ensures that the slab is accurately dimensioned and the adjacent sides of the slab are orthogonal to each other. It also ensures that the sides of the slab are vertically extending and the surface of the slab is horizontally extending or plumb as desired in best building practice. This provides a suitable foundation for dimensional accuracy and excellence in the building structure above the slab.
Another advantage of the apparatus described above with reference to the drawings is that it includes a construction member anchor or a bar anchor in the slab when it is poured. Once the slab has formed a vertically extending bar forming part of the building to be built can be mounted on the bar anchor so that it is strongly and accurately fixed in position on the slab extending up away from the slab. This saves a significant amount of time because it avoids the need to drill into the slab after it is formed. Further, it enables an extremely fine and high tolerance positioning of the bar on the slab and this ultimately enhances the accuracy and tolerance of the walls built on the foundation.
It will of course be realized that the above has been given only by way of illustrative example of the disclosure and that all such modifications and variations thereto, as would be apparent to persons skilled in the art, are deemed to fall within the broad scope and ambit of the disclosure as is herein set forth.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2017902642 | Jul 2017 | AU | national |
