CONCRETE FORMWORK BRACE AND METHOD OF BRACING CONCRETE FORMWORK
A concrete formwork brace having a base, a bracket configured to support a concrete formwork and a pair of adjustable arms. A first length adjustable arm is connected to the base and the bracket and a second arm is connected to the base and the bracket. The connection between the first arm and the base is vertically offset from the connection between the second arm and the base and the connection between the first arm and the bracket is vertically offset from the connection between the second arm and the bracket. The first arm is length adjustable such as to adjust the orientation of the bracket.
The invention relates to concrete formwork braces and methods of bracing concrete formwork.
BACKGROUND TO THE INVENTIONIn the construction industry concrete forms, or formwork include barriers and moulds that hold concrete or other cementitious material while it hardens to assume a desired shape. Braces have been suggested to hold the formwork in the required position, resisting the strong forces which wet concrete exerts against formwork. For example, wood props may be anchored to the ground with pegs and secured to formwork. This often results in damage to the formwork and wooden props as screws or other fasteners create holes in the wood. Such systems of wooden bracing can be wasteful and costly.
Removing bracing from the formwork is often invasive as fasteners are pried out. Concrete that has not sufficiently hardened will be damaged by early removal of bracing or formwork. Generally, current types of bracing must stay in place at least overnight.
Although prior braces can be fastened in different positions to provide some variation in position, once the braces are fastened to the formwork they are generally set in place and they cannot be re-adjusted without un-fastening and refastening.
To provide some adjustment, bracing has been provided with an extendable strut or arm. Other known braces have employed “pivot points” for angular adjustment of a diagonal strut included in the brace. However the ability to readily adjust the brace can sometimes compromise the rigidity of the brace and its ability to keep the formwork in place. Furthermore, improvements can be made to the precision and ease of brace adjustments.
Prior braces have failed to rest properly on uneven or sloping surfaces without compromising the functioning of the brace.
Prior braces are often difficult and cumbersome to assemble, and therefore time-consuming to install.
Reference to any prior art in this specification does not constitute an admission that such prior art forms part of the common general knowledge.
It is an object of the invention to provide an improved concrete formwork brace and/or method of bracing which overcomes or at least ameliorates some or all of the above shortcomings, or to at least provide the public with a useful choice.
SUMMARY OF THE INVENTIONAccording to one aspect the invention provides a concrete formwork brace including: a base, a bracket configured to support a concrete formwork, a first length adjustable arm, connected to the base and the bracket, and a second arm connected to the base and the bracket; wherein the connection between the first arm and the base is vertically offset from the connection between the second arm and the base, wherein the connection between the first arm and the bracket is vertically offset from the connection between the second arm and the bracket; and wherein the first arm is length adjustable such as to adjust the orientation of the bracket.
Preferably the second arm is length adjustable.
Preferably the connection between the first arm and the base is horizontally offset from the connection between the second arm and the base.
Preferably the connection between the first arm and the base is at a first end of the base and the connection between the second arm and the base is at an intermediate position between the first end of the base and a second end of the base.
Preferably the connection between the second arm and the base is centrally located on the base.
Preferably the connection between the second arm and the base is vertically elevated relative to the connection between the first arm and the base.
Preferably the base has mounting features for securing the base to a ground surface.
Preferably the mounting features are apertures configured to receive fasteners for securing the base to a ground surface.
Preferably the bracket has mounting features for securing the bracket to formwork.
Preferably the bracket has apertures configured to receive fasteners securing the bracket to formwork
Preferably the bracket is configured to rest, in use, on a ground surface.
Preferably the bracket is height-adjustable.
Preferably the brace includes a level indicator.
Preferably the first length adjustable arm is length-adjustable by rotation of a threaded element.
Preferably the second arm is length-adjustable by rotation of a threaded element.
Preferably the connection between the first arm and the bracket is a pivotal connection and the connection between the second arm and the bracket is a pivotal connection.
Preferably the connection between the first arm and the base is a pivotal connection and the connection between the second arm and the base is a pivotal connection.
This aspect also extends to a method of bracing a concrete formwork, the method including the steps of: arranging the concrete formwork brace adjacent the concrete formwork, with the bracket facing the concrete formwork, securing the base to the ground or other underlying support; adjusting one or more of the first and second arms relative to the base and the bracket, to adjust the orientation and/or position of the bracket.
According to a second aspect the invention provides a concrete formwork brace including: a base; and a bracket supported by the base, the bracket including: a first engagement element configured to engage with a cooperating second engagement element on a concrete formwork to define a releasable connection between the bracket and the formwork.
Preferably the releasable connection is a clamp connection.
Alternatively the releasable connection is a hook connection.
Preferably, in use, in an engaged state the bracket is flush against the formwork.
Preferably the second engagement element includes a protrusion.
Preferably the protrusion is located in a recess of the bracket when the bracket and the formwork are connected.
Preferably the actuator is a lever.
Alternatively the actuator is a latch.
Alternatively the actuator is a twist lock actuator.
Preferably the actuator is removable from the bracket.
Preferably the formwork is wooden.
Alternatively the formwork is metal.
Optionally the second engagement element is inserted into a channel in the formwork.
Preferably the second engagement element acts as a spacer when formwork is arranged in stacks.
This aspect also extends to a method of releasably engaging formwork to a concrete formwork brace, the method including the steps of: creating or securing a second engagement element on the formwork, arranging the concrete formwork brace adjacent the formwork, with the bracket facing the concrete formwork, and; engaging the first engagement element with the second engagement element.
This aspect also extends to a concrete formwork system including: one or more concrete formwork braces; and concrete formwork including one or more second engagement elements configured to cooperate with one of the first engagement elements.
This invention also extends to concrete formed by the method of the first aspect and/or the method of the second aspect.
The invention will now be described by way of example only, with reference to the accompanying drawings, in which:
The invention relates to concrete formwork braces and methods of bracing concrete formwork. “Concrete” in this context may relate to any cementitious material used in construction which hardens to assume a desired shape or configuration including but not limited to materials including concrete, cements and limes. “Formwork” includes any suitable barriers or moulds for supporting concrete in a desired shape or configuration while it hardens. This may include wooden, metal or plastic formwork, but the invention is not limited in this respect. Formwork may be used in formation of concrete slabs, foundations, panels, monolithic structures or any other suitable cementitious structure.
Both the first arm 4 and the second arm 5 are pivotally connected to the bracket 3. In some embodiments the first arm 4 and the second arm 5 may also be pivotally connected to the base 2. As shown in
Further, the pivotal connection 8 between the first arm 4 and the bracket 3 is vertically offset from the pivotal connection 9 between the second arm 5 and the bracket 3. This vertical offset is shown by arrow B in
Preferably, the connection 6 between the first arm 4 and the base 2 is also horizontally offset from the connection 7 between the second arm 5 and the base 2. This horizontal offset is shown by arrow C in
Referring now to the top view of
Preferably, the bracket 3 also includes mounting features for securing the bracket 3 to concrete formwork. In the shown embodiment, these are apertures for receiving fasteners (screws, nails etc), however they may be any other suitable mounting features. As will be discussed later in the specification, in an alternative embodiment these mounting features may be part of a quick release mechanism for attachment/release of the bracket to/from the formwork.
In use the bracket 3 may rest on a ground surface. This is accomplished by way of a foot 14 (
The concrete formwork brace 1 may also include a level indicator (not shown), for assisting a user to arrange the geometry of the brace in a desired orientation.
The length-adjustment of the arms may be effected through any suitable mechanism. In the shown embodiment, arm length is adjusted by rotation of a threaded element. This may be adjusted manually or using a power tool. A first portion 5a of each arm includes a threaded section (not visible in
In order to adjust the length of the first or second arm 4, 5, a user may manually twist the handle portion 5b. Alternatively, the Applicant's brace allows powered adjustment of arm length. Each arm includes a drive head 4c, 5c, with a suitable shape for receiving a drive bit from a power tool such as a handheld power drill. Each drive head 4c, 5c is linked to the threaded drive mechanism described above. Rotation of the drive head 4c, 5c will cause rotation of the handle portion 4b, 5b relative to threaded section of each first portion 4a, 5a of the arms 4, 5.
Further, the bracket 3 may include a first portion 3a mounted to the first and second arms and a second portion 3b mounted to the first portion 3a. The second portion 3b may be adjustable relative to the first portion by rotation of a drive screw with a head 3c. The drive screw may be adjusted manually or using a power tool such as a handheld power drill. In
To brace concrete formwork using the brace 1, a user may arrange the brace 1 adjacent the concrete formwork, with the bracket 3 facing the concrete formwork. Then the user may secure the base 2 to the ground or other underlying support (for example, using the mounting features 12). Then the user may adjust one, or both of the first and second arms relative to the base 2 and the bracket 3, to adjust the orientation and/or position of the bracket relative to the base. The user may also adjust the height of the brace 3. The user may attach the bracket to formwork using screws or other fasteners, or using a quick release mechanism such as described below. In practice a plurality of braces will generally be arranged to support a formwork. The user may fine tune the brace adjustments once two or more, or all, of the braces are in position.
Another aspect of the invention relates to a quick-release mechanism for readily attaching and detaching concrete formwork braces to formwork.
Preferably, in an engaged state the bracket 3 is flush against the formwork.
The concrete formwork brace 1 may include an actuator 18 to toggle the first engagement element 16 between an engaged state and an unengaged state. The actuator 18 may be a lever, a handle, knob, button or any other suitable actuator.
The second engagement element may act as a spacer when formwork is arranged in stacks (e.g. for transportation or storage). This increases airflow between the formwork members allowing faster drying after use and reduced distortion/warping of the formwork.
The invention facilitates removal of bracing from formwork in a non-disruptive manner which does not affect the concrete. The result is that bracing can be removed from formwork much sooner than under traditional bracing methods. This saves construction time and cost. In some applications it is expected that the bracing could be removed from the formwork the same day as concrete is poured.
The concrete formwork brace of the present invention, when equipped with a suitable connector, does not damage formwork each time it is attached to and detached from formwork. It is highly reusable, and saves on materials and cost.
The brace of the present invention can be readily adjusted both manually and using automated power tools. The adjustment is quick and simple, and can be made before or after the brace has been secured to the formwork.
There is thus provided a concrete formwork brace which is sturdy and readily adjustable to accommodate different required heights and/or orientations. The quadrilateral geometry of the brace provides rigidity ensuring that formwork is kept in place. The brace is quick, easy and convenient to set up. Angular and height adjustments can be made with ease.
The four pivot points of adjustment allow angular and height adjustments of the bracket to be made with extreme precision. This arrangement also allows the brace to be used on sloping surfaces.
There is provided a brace which can be quickly secured to and detached from formwork, using a quick release mechanism. This improves the efficiency of completing the concrete forming as users can quickly set up the braces and move them from formwork to formwork.
While the present invention has been illustrated by the description of the embodiments thereof, and while the embodiments have been described in detail, it is not the intention of the Applicant to restrict or in any way limit the scope of the appended claims to such detail. Further, the above embodiments may be implemented individually, or may be combined where compatible. Additional advantages and modifications, including combinations of the above embodiments, will readily appear to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative apparatus and methods, and illustrative examples shown and described. Accordingly, departures may be made from such details without departure from the spirit or scope of the Applicant's general inventive concept.
Claims
1. A concrete formwork brace including:
- a base,
- a bracket configured to support a concrete formwork,
- a first length adjustable arm, connected to the base and the bracket, and
- a second arm connected to the base and the bracket;
- wherein the connection between the first arm and the base is vertically offset from the connection between the second arm and the base,
- wherein the connection between the first arm and the bracket is vertically offset from the connection between the second arm and the bracket; and
- wherein the first arm is length adjustable such as to adjust the orientation of the bracket.
2. The concrete formwork brace of claim 1, wherein the second arm is length adjustable.
3. The concrete formwork brace of claim 1 wherein the connection between the first arm and the base is horizontally offset from the connection between the second arm and the base.
4. The concrete formwork brace of claim 1 wherein the connection between the first arm and the base is at a first end of the base and the connection between the second arm and the base is at an intermediate position between the first end of the base and a second end of the base.
5. The concrete formwork brace of claim 4 wherein the connection between the second arm and the base is centrally located on the base.
6. The concrete formwork brace of claim 1 wherein the connection between the second arm and the base is vertically elevated relative to the connection between the first arm and the base.
7. The concrete formwork brace of claim 1 wherein the base has mounting features for securing the base to a ground surface.
8. The concrete formwork brace of claim 7 wherein the mounting features are apertures configured to receive fasteners for securing the base to a ground surface.
9. The concrete formwork brace of claim 1 wherein the bracket has mounting features for securing the bracket to formwork.
10. The concrete formwork brace of claim 9 wherein the bracket has apertures configured to receive fasteners securing the bracket to formwork
11. The concrete formwork brace of claim 1 wherein the bracket is configured to rest, in use, on a ground surface.
12. The concrete formwork brace of claim 1 wherein the bracket is height-adjustable.
13. The concrete formwork brace of claim 1 wherein the brace includes a level indicator.
14. The concrete formwork brace of claim 1, wherein the first length adjustable arm is length-adjustable by rotation of a threaded element.
15. The concrete formwork brace of claim 2, wherein the second arm is length-adjustable by rotation of a threaded element.
16. The concrete formwork brace of claim 1 wherein the connection between the first arm and the bracket is a pivotal connection and the connection between the second arm and the bracket is a pivotal connection.
17. The concrete formwork brace of claim 1 wherein the connection between the first arm and the base is a pivotal connection and the connection between the second arm and the base is a pivotal connection.
18. A concrete formwork brace as claimed in claim 1 wherein the bracket includes a first engagement element configured to engage with a cooperating second engagement element on a concrete formwork to define a releasable connection between the bracket and the formwork.
19. The concrete formwork brace of claim 18 wherein the releasable connection is a clamp connection.
20. The concrete formwork brace of claim 18 wherein the releasable connection is a hook connection.
Type: Application
Filed: Sep 11, 2015
Publication Date: Mar 17, 2016
Inventors: David Kim SCOTT (Feilding), Shanon Matthew MARTIN (Palmerston North)
Application Number: 14/851,602