AU2021285086A1

AU2021285086A1 - A coupler assembly

Info

Publication number: AU2021285086A1
Application number: AU2021285086A
Authority: AU
Inventors: Joseph Eric Stacey; David Arthur West
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-03
Filing date: 2021-06-03
Publication date: 2023-02-02
Also published as: WO2021243414A1

Abstract

A coupler assembly for joining and/or tensioning structural elements to each other, the assembly comprising: a rod member having one or more transverse bores therein and a threaded portion at one end thereof; a tubular sleeve member having one or more transverse bores therein and a threaded portion at one end thereof; and one or more transverse pin assemblies located at least partially within the transverse bores in the rod member, wherein each transverse pin assembly comprises a pair of pin members biased into an engaged condition, wherein, in use, the rod member is at least partially inserted into the tubular sleeve member such that when the one or more transverse bores in the rod member align with the one or more transverse bores in the tubular sleeve member, each transverse pin assembly passes at least partially through the one or more transverse bores in the tubular sleeve member thereby locking the rod member and the tubular sleeve member against movement relative to one another to form the coupler assembly.

Description

A COUPLER ASSEMBLY

TECHNICAL FIELD

[0001 ] The present invention relates to a coupler assembly for safely joining and/or tensioning structural elements to each other. In particular, the present invention relates to a system for safely joining and/or tensioning reinforced concrete elements using one or more coupler assemblies.

BACKGROUND ART

[0002] There are numerous existing methods and apparatus for mechanically coupling or joining and/or tensioning structural elements in the building industry.

[0003] Some prior art methods rely on threading the ends of reinforcing structural elements to be joined, so that they can be screwed into an intermediate coupler in which female threads have been cut, or by extruding or swaging complementary male and female portions onto the structural elements to be joined. These methods, however, have the disadvantage in that whilst the coupler and/or structural elements are threaded together, the structural element is not load bearing and the reinforced concrete element is not self-supporting. Further, it is difficult for an inspector to visually assess whether the coupler is fully engaged with the structural elements. In addition, forging the ends of structural elements is costly and relies on on-site work skills in ensuring that the coupler is installed correctly and that the forged ends can be connected without the need of rotating the structural elements. This method requires a third part outer sleeve or other method of containing the joined structural elements during construction.

[0004] In one prior art method, there is provided a coupler utilising an adjustment nut screwed on a threaded rebar stud wherein the adjustment nut is forcibly jacked against washers functioning as bearing surfaces of a coupler member screwed on an opposing rebar stud. However, this coupler requires the rebar to be aligned or centred prior to joining them together. In another prior art method, a coupler for joining structural elements comprises a non-rotating and non-adjustable seating stud associated with a first structural element that engages a rotatable and adjustable inner coupler screw threadedly engaged with a threaded post and associated with a second structural element, wherein rotation of the inner coupler about the threaded post and relative to the seating stud adjusts the distance between opposing structural elements and thereby the distance between the reinforced concrete elements. The inner coupler is locked against the seating stud by screwing an enclosing outer coupler associated with the seating stud onto the inner coupler. This coupler, however, has the disadvantage in that the position of the inner coupler relative to the seating stud must be adjusted to the desired final position before the inner coupler is locked to the seating stud and therefore until the outer coupler is screwed onto the inner coupler there is a risk that the seating stud may slip out from or be jolted out of the inner coupler. In addition, this mode of assembly represents a potential safety risk in that the reinforced concrete element may be suspended above the worker whilst the inner coupler is adjusted. In addition, the amount the distance between the joined structural elements may be adjusted is limited by the length of the inner coupler.

[0005] A further method requires one of the structural elements to be contained within an outer tubing wherein the outer tubing is filled with a non-shrink grout. This method requires a very large outer tube which often cannot conform to concreting cover requirements and requires a high level of skill to be correctly installed.

[0006] In all of the above prior art methods of joining reinforcing structural elements, not only is there a reliance on the skill of the operator, but the actual diligence of the operator to effect a secure join. There have been instances of screwed joints which have only been screwed a few turns on the end of the structural elements because of laziness or carelessness on the part of the operator. This can have dire consequences, especially in high rise buildings which rely on the integrity of reinforced concrete structures several floors up.

[0007] In some prior art methods, shims or packers are used for packing under precast concrete panels in order to adjust the height and/or level the concrete panels. In these instances, the structural elements within concrete panels may already be connected to structural elements in adjacent concrete panels. Not only is there a reliance on the skill of the operator to correctly place the required number and type of shims, if the concrete panels have not been correctly braced or supported there is a risk that the concrete panels will become unstable and fall. [0008] Thus, there would be an advantage if it were possible to provide a coupler assembly for safely joining and/or tensioning structural elements, for example reinforcing structural elements, that ameliorates the aforementioned problems.

[0009] It will be clearly understood that, if a prior art publication is referred to herein, this reference does not constitute an admission that the publication forms part of the common general knowledge in the art in Australia or in any other country.

SUMMARY OF INVENTION

[0010] The present invention is directed to a coupler assembly for joining and/or tensioning structural elements, which may at least partially overcome at least one of the abovementioned disadvantages or provide the consumer with a useful or commercial choice.

[0011] The terms “join” or “joining”, as used herein, mean to connect two or more elements together, wherein the elements may be connected together so as to form a unit or brought into association with each other and wherein the connection may be temporary or permanent.

[0012] The terms “tension” or “tensioning”, as used herein, means to apply a tensioning force on a structural element such that the structural element is stretched and then locked in place thus maintaining the tensioning force in the structural element. It will be understood that tensioning the structural element may induce a compressive stress in reinforced concrete elements pre-compressing or pre-stressing the concrete.

[0013] With the foregoing in view, the present invention in one form, resides broadly in a coupler assembly for joining and/or tensioning structural elements to each other, the assembly comprising: a rod member having one or more transverse bores therein and a threaded portion at one end thereof; a tubular sleeve member having one or more transverse bores therein and a threaded portion at one end thereof; and one or more transverse pin assemblies located at least partially within the transverse bores in the rod member, wherein each transverse pin assembly comprises a pair of pin members biased into an engaged condition, and wherein, in use, the rod member is at least partially inserted into the tubular sleeve member such that when the one or more transverse bores in the rod member align with the one or more transverse bores in the tubular sleeve member, each transverse pin assembly passes at least partially through the one or more transverse bores in the tubular sleeve member thereby locking the rod member and the tubular sleeve member against movement relative to one another to form the coupler assembly.

[0014] The coupler assembly may be used to join and/or tension any suitable type of structural elements together. For instance, the structural element may be a mesh of steel wires, high strength tendons, multi-wire strands, single wire strands, a prestressing steel bar, a steel bar, a deformed (ridged) steel bar, a fibre-reinforced polymer bar, a mild steel bar, a galvanised steel bar, an epoxy-coated steel bar, a European steel bar, a carbon steel bar, a stainless steel bar, a reinforcing bar or the like. Preferably however, the structural element may be of sufficient size, shape and configuration to be used in reinforced concrete and/or masonry structures to strengthen and aid the concrete under tension.

[0015] The coupler assembly may be fabricated from any suitable material. In a preferred embodiment of the invention, the coupler assembly may be fabricated from a metal or metal alloy (such as, but not limited to stainless steel, carbon steel, mild steel, alloy steels, galvanised steel, epoxy-coated steel, European steel, duplex stainless, nickel-based steels, or the like), a polymer (such as, but not limited to, polyamide, aramids, polyimide, polyamide imide, polyetherimide, polyphenylene sulphide, polyetheretherketone, polytetrafluoroethylene, polyethylene, acetal, polyvinyl chloride, polycarbonate, acrylic, or the like), a composite polymer (such as a fibre reinforced polymer, fibreglass, carbon fibre, metal-polymer composites, or the like). In some embodiments of the invention, the components of the coupler assembly may be fabricated from the same type of material or from different types of materials. In some embodiments of the invention, the components of the coupler assembly may be fabricated from the same grade of material, or from different grades of material.

[0016] The coupler assembly may be fabricated by any suitable means. For instance, the coupler assembly may be fabricated by casting (such as, but not limited to, die casting, sand casting, shell moulding, or the like), forming (such as, but not limited to, extrusion, forging, powder metallurgy, or the like), cutting (such as, but not limited to, machining or subtractive manufacturing, milling, turning, drilling, grinding, abrasion, broaching, chamfering, or the like), joining (such as, but not limited to, welding, brazing, riveting, or the like) or any suitable combination thereof. In some embodiments of the invention, the components of the coupler assembly may be fabricated using the same type of forming process, or may be fabricated using different types of forming processes. In an embodiment of the invention, the components of the coupler assembly may be fabricated using machining. In a preferred embodiment of the invention, the components of the coupler assembly may be fabricated using casting. Preferably, the components of the coupler assembly may be fabricated individually. In this instance, it will be understood that the components of the coupler assembly may be fabricated at the same time but as individual components.

[0017] In use, it is envisaged that the coupler assembly may undergo one or more finishing processes after forming. For instance, the coupler assembly may undergo a machining operation, a threading process, a boring and/or drilling process, a chamfering operation, knurling, a grinding operation, a heat treatment, electroplating, thermal spraying, or any suitable combination thereof. In some embodiments of the invention, the finishing process may be performed on at least a portion of the component of the coupler assembly, or substantially all of the component of the coupler assembly. For instance, a boring operation may be performed on an adjustment member and a tubular sleeve member, wherein the adjustment member may be provided with a bore which extends the entire length of the adjustment member whereas the tubular sleeve member may be provided a bore which extends at least part way through the tubular sleeve member.

[0018] In some embodiments of the invention, the components of the coupler assembly may be fabricated using the same types of finishing processes, or may be fabricated using different types of finishing processes. For instance, each of the rod member, the tubular sleeve member, the first adjustment member and the second adjustment member may be provided with a thread on at least one surface thereof. For instance, a portion of the rod member may be provided with a thread on an external surface thereof whereas a different portion of the rod member may undergo a boring process to provide one or more transverse holes.

[0019] The coupler assembly for joining and/or tensioning structural elements to each other may comprise a rod member. The rod member may be of any suitable size, shape or configuration. Preferably, however the rod member may be adapted for connection to any suitable tubular sleeve member. In a preferred embodiment of the invention, the rod member may comprise a threaded portion at one end thereof. Preferably, the rod member comprises a body portion, the body portion comprising a first end and an opposed second end, and a threaded portion located at the second end of the body portion. In use, it is envisaged that the threaded portion of the rod member may be adapted for connection to any suitable adjustment member

[0020] In some embodiments of the invention, the body portion and the threaded portion of the rod member may be formed separately and joined to one other, or may be integrally formed. Preferably, the body portion and the threaded portion may be integrally formed and may undergo one or more finishing processes. In this instance, it is envisaged that the one or more finishing processes provide the functional feature and/or features of the body portion and/or the threaded portion.

[0021] The body portion of the rod member may undergo any suitable finishing process. Preferably, however the body portion of the rod member may undergo one or more of a machining operation to remove excess material, a chamfering process to provide a transitional edge between the body portion and the threaded portion, a chamfering process at an end of the body portion to ease insertion of the rod member into a tubular sleeve member, a boring process to provide one or more transverse holes in the body portion, a broaching process to form a keyway in the one or more transverse holes, a grinding operation to provide a required finish, or the like. [0022] The body portion of the rod member may be of any suitable shape in cross-section. For instance, the body portion may have a substantially circular, oval, square, rectangular, hexagonal, or octagonal shape in cross-section. Preferably, the rod member may have a substantially circular shape in cross section. In use, it is envisaged that a rod member having a substantially circular shape in cross-section may be simpler for a worker to insert into a tubular sleeve member. Preferably, the rod member may be an elongate rod member.

[0023] The body portion of the rod member may be of any suitable length and diameter. However, it will be understood that the length and diameter of the body portion may vary depending on a number of factors, including the size of the tubular sleeve member, the tensile load specified to be carried by the joined structural elements and the number and type of transverse pin assemblies.

[0024] The threaded portion of the rod member may undergo any suitable finishing process. Preferably, however the threaded portion of the rod member may undergo one or more of a machining operation to remove excess material, a chamfering process at an end of the threaded portion to ease insertion of the threaded portion into an adjustment member, a threading process to provide a thread on a surface of the threaded portion, a grinding operation to provide a required finish, or the like.

[0025] The threaded portion of the rod member may be of any suitable shape in cross-section. Preferably, however, the threaded portion of the rod member may have a substantially circular shape in cross section. Preferably, the threaded portion of the rod member may be an elongate threaded portion.

[0026] The threaded portion of the rod member may be of any suitable size, shape or configuration. For instance, the diameter of the threaded portion may be larger than the diameter of the body portion, may be substantially similar to the diameter of the body portion or may be smaller than the diameter of the body portion. Preferably, however, the diameter of the threaded portion may be substantially similar to the diameter of the bar to be joined.

[0027] The threaded portion of the rod member may be provided with one or more external threads located on a surface thereof. In some embodiments of the invention, the one or more external threads may extend at least part way along the length of the threaded portion or substantially the entire length of the threaded portion. The one or more external threads may be located on any suitable portion of the threaded portion of the rod member. Preferably, however, the one or more external threads may be located towards the end of the threaded portion opposing the body portion of the rod member. In use, it is envisaged that the one or more external threads of the threaded portion may engage with one or more internal threads located within a first adjustment member.

[0028] In an embodiment of the invention, the threaded portion of the rod member may be provided with one external thread. In an alternative embodiment of the invention, the threaded portion may be provided with two or more external threads. The two or more external threads may be of the same handedness, threadform, angle, lead, pitch, depth, tolerance, taper, and the like, or may be different. The two or more external threads may extend the same length along the threaded portion, or may extend different lengths. For instance, the first external thread on the threaded portion may extend substantially the same length as the second external thread, may extend a shorter length along the threaded portion than the second external thread, may extend a longer length along the threaded portion than the second external thread. In an embodiment of the invention, the threaded portion of the rod member may be provided with a first external thread at an end of the threaded portion adapted for connection to the first adjustment member which may be shorter in length than a second external thread located at an end of the threaded portion adjacent the second end of the body portion of the rod member.

[0029] In some embodiments of the invention, the threaded portion of the rod member may be provided with an indicator portion wherein the indicator portion may act as a visual indicator of whether the threaded portion of the rod member has been screw-threadedly engaged to a sufficient depth within an adjustment member. The indicator portion may be located on any suitable portion of the threaded portion. However, it will be understood that the location of the indicator portion may vary depending on a number of factors, such as the size, shape and configuration of the reinforcing elements being connected, the requirements of the relevant standard and the size, shape and configuration of the coupler assembly. Any suitable indicator portion may be used. For instance, the indicator portion may be a discontinuity in the thread in the threaded portion such as a change in handedness, threadform, angle, lead, pitch, depth, tolerance, taper, or the like), may be a coloured portion, may be a gasket, O-ring, or the like, or any suitable combination thereof.

[0030] Preferably, the rod member comprises one or more transverse bores therein. In use, it is envisaged that the one or more transverse bores may be located in the body portion of the rod member. Preferably, the one or more transverse bores may be spaced along the length of the rod member.

[0031] The one or more transverse bores may extend at least part way through the rod member. Preferably, the one or more transverse bores may extend substantially all of the way through the rod member. Thus, it is envisaged that each transverse bore of the one or more transverse bores may comprises a pair of open ends or one open end and one closed end. The one or more transverse bores may be substantially linear, or may have a curved or tortuous path. The one or more transverse bores may be of any suitable length and any suitable diameter. The diameter of the one or more transverse bores may be substantially constant along its length, or may vary along its length. For instance, the one or more transverse bores may taper along at least a portion of its length, may include a neck or similar narrowing portion, and the like.

[0032] Each transverse bore of the one or more transverse bores may be substantially similar in size, shape or configuration to each other transverse bore in the rod member or may be different. For instance, the one or more transverse bores may be of the same diameter or may be of different diameters. In use, it is envisaged that the size, shape, or configuration of the one or more transverse bores may be determined by the size, shape, or configuration of the transverse pin assemblies.

[0033] The rod member may comprise any suitable number of transverse bores. For instance, the rod member may comprise one transverse bore, two transverse bores, three transverse bores, four transverse bores, or the like. In some embodiments of the invention, the rod member may comprise one transverse bore or two transverse bores. In use, it is envisaged that the number of transverse bores may be determined by the number of transverse pin assemblies required to meet the tensile load specified to be carried by the joined structural elements.

[0034] The coupler assembly for joining and/or tensioning structural elements to each other may comprise a tubular sleeve member. The tubular sleeve member may be of any suitable size, shape, or configuration. Preferably, however the tubular sleeve member may be adapted for connection with any suitable rod member. In a preferred embodiment of the invention, the tubular sleeve member may comprise a threaded portion at one end thereof. Preferably, the tubular sleeve member comprises a body portion, the body portion comprising a first end and an opposed second end and a bore extending at least part way through the body portion from the first end to the second end, and a threaded portion located at the second end of the body portion. In an embodiment of the invention, wherein the body portion and the threaded portion of the tubular sleeve member may be formed separately, the body portion may comprise a bore extending substantially all of the way through the body portion from the first end to the second end. Thus, it is envisaged that the bore may comprise a pair of open ends. In use, it is envisaged that the threaded portion of the tubular sleeve member may be adapted for connection with any suitable adjustment member.

[0035] In some embodiments of the invention, the body portion and the threaded portion of the tubular sleeve member may be formed separately and joined to one other, or may be integrally formed. In an embodiment of the invention wherein the threaded portion and the body portion of the tubular sleeve member may be formed separately, the threaded portion may be adapted for removable connection to the body portion. Preferably, the body portion and the threaded portion may undergo one or more finishing processes. In this instance, it is envisaged that the one or more finishing processes facilitate the function of the body portion and/or the threaded portion.

[0036] The body portion of the tubular sleeve member may undergo any suitable finishing process. Preferably, however the body portion of the tubular sleeve member may undergo one or more of a machining operation to remove excess material, a chamfering process to provide a transitional edge between the body portion and the threaded portion, a chamfering process at an end of the body portion to ease insertion of the rod member into a tubular sleeve member, a boring process to provide one or more transverse holes in the body portion, a boring process to provide an axially extending bore in the body portion, a grinding operation to provide a required finish, or the like.

[0037] In a preferred embodiment of the invention, the tubular sleeve member comprises an opening at the first end of the body portion. Preferably, the opening may be shaped (such as by chamfering or the like) to ease insertion of the rod member into the tubular sleeve member. Preferably, the opening and/or at least a portion of the bore of the tubular sleeve member may be chamfered or otherwise shaped to ease insertion of the rod member into the tubular sleeve member. In use, it is envisaged that chamfering the opening and/or at least a portion of the bore of the tubular sleeve member may provide the tubular sleeve member with one or more guide portions, wherein the one or more guide portions may be configured to align the rod member with the tubular sleeve member and/or ease insertion of the rod member into the tubular sleeve member. In use, it is envisaged that the one or more guide portions may be configured to engage one or more transverse pin assemblies of the rod member, such that the contact between the one or more guide portions may assist in aligning the one or more transverse pin assemblies with the one or more transverse bores of the tubular sleeve member as the rod member is inserted into the tubular sleeve member. Preferably, the guide portion may substantially preclude movement of the rod member out of alignment with the tubular sleeve member as the rod member is inserted into the tubular sleeve member.

[0038] The one or more guide portions may be of any suitable size, shape or configuration. For instance, the guide portion may comprise one or more longitudinally extending recesses, one or more concentric chamfer portions located at or near the opening of the bore, one or more concentric chamfer portions extending at least partially about the inner circumference of the bore, one or more stepped portions, or any suitable combination thereof. In a preferred embodiment of the invention, the one or more guide portions comprise a lead-in chamfer. The guide portions may be located in any suitable orientation about the opening of the tubular sleeve member, preferably however, the tubular sleeve member comprises a first guide member and a diametrically opposed second guide member. [0039] In some embodiments of the invention, the one or more guide portions may be the same type of guide portion or may be of different types. In an embodiment of the invention wherein different types of guide portions may be present, it is envisaged that each guide portion may perform a different function. For instance, a guide portion may be configured such that contact between the guide portion and one or more transverse pin assemblies applies force to a pin member of the transverse pin assembly causing the pin member to move against the force of a biasing member, such that the pin member is forced into the transverse bore of the rod member. For instance, a guide portion may be configured such that it serves to align the one or more transverse pin assemblies of the rod member with the one or more transverse bores of the tubular sleeve member. For instance, a first guide portion may act as a transition surface to enable a user to rotate the rod member from a first location at the opening of the tubular sleeve member to a second location.

[0040] The body portion of the tubular sleeve member may be of any suitable shape in cross-section. For instance, the body portion may have a substantially circular, oval, square, rectangular, hexagonal, or octagonal shape in cross-section. Preferably, the tubular sleeve member may have a substantially circular shape in cross section. In use, it is envisaged that a tubular sleeve member having a substantially circular shape in cross-section may be simpler for a worker to receive a rod member. In a preferred embodiment of the invention, the tubular sleeve member may be cylindrical or substantially cylindrical in configuration.

[0041] The body portion of the tubular sleeve member may be of any suitable length and diameter. However, it will be understood that the size of the body portion may vary depending on a number of factors, including the size of the tubular sleeve member, the tensile load specified to be carried by the joined structural elements and the number and type of transverse pin assemblies. Preferably, the tubular sleeve member may be an elongate tubular sleeve member.

[0042] The threaded portion of the tubular sleeve member may undergo any suitable finishing process. Preferably, however the threaded portion of the tubular sleeve member may undergo one or more of a machining operation to remove excess material, a chamfering process at an end of the threaded portion to ease insertion of the threaded portion into an adjustment member, a threading process to provide a thread on a surface of the threaded portion, a grinding operation to provide a required finish.

[0043] The threaded portion of the tubular sleeve member may be of any suitable shape in cross-section. Preferably, however, the threaded portion of the tubular sleeve member may have a substantially circular shape in cross section. Preferably, the threaded portion of the tubular sleeve member may be an elongate threaded portion.

[0044] In an embodiment of the invention wherein the threaded portion may be adapted for removable connection to the body portion of the tubular sleeve member, the threaded portion may comprise an end portion, wherein the threaded portion may be configured to pass at least partially through the bore of the body portion from the first end through to the second end and wherein the end portion substantially precludes the threaded portion from passing out of the opening at the second end of the body portion. The end portion may be a projection extending outwardly from a surface of the threaded portion. Any suitable projection may be provided, such as a flange, a head, or any suitable combination thereof. Preferably, the projection is located on an external surface of the threaded portion towards or at an end of the threaded portion. It is envisaged that a projection located on an external surface of the threaded portion or at the end of the threaded portion may preclude the threaded portion from passing out of the opening at the second end of the body portion. Thus, it is envisaged that the projection may extend outwardly from the surface of the threaded portion such that the diameter of the threaded portion (including the projection) is at least equal to the diameter of the opening at the second end of the body portion. In use, it is envisaged that rod member may retain the threaded portion of the tubular sleeve member in removable connection to the body portion of the tubular sleeve member by frictional engagement, substantially precluding the threaded portion of the tubular sleeve member from movement within the bore of the body portion of the tubular sleeve.

[0045] The threaded portion of the tubular sleeve member may be of any suitable size, shape or configuration. For instance, the diameter of the threaded portion may be larger than the diameter of the body portion, may be substantially similar to the diameter of the body portion or may be smaller than the diameter of the body portion. Preferably, however, the diameter of the threaded portion may be substantially similar to the diameter of the bar to be joined.

[0046] The threaded portion of the tubular sleeve member may be provided with one or more external threads located on a surface thereof. In some embodiments of the invention, the one or more external threads may extend at least part way along the length of the threaded portion or substantially the entire length of the threaded portion. The one or more external threads may be located on any suitable portion of the threaded portion of the tubular sleeve member. Preferably, however, the one or more external threads may be located towards the end of the threaded portion opposing the body portion of the tubular sleeve member. In this way, it is envisaged that the one or more external threads of the threaded portion may engage with one or more internal threads located within a second adjustment member.

[0047] In an embodiment of the invention, the threaded portion of the tubular sleeve member may be provided with one external thread. In an alternative embodiment of the invention, the threaded portion may be provided with two or more external threads. The two or more external threads may be of the same handedness, threadform, angle, lead, pitch, depth, tolerance, taper, or the like or may be different. The two or more external threads may extend the same length along the threaded portion, or may extend different lengths. For instance, the first external thread on the threaded portion may extend substantially the same length as the second external thread, may extend a shorter length along the threaded portion than the second external thread, may extend a longer length along the threaded portion than the second external thread. In an embodiment of the invention, the threaded portion of the tubular member may be provided with a first external thread at an end of the threaded portion adapted for connection to the second adjustment member which may be shorter in length than a second external thread located at an end of the threaded portion adjacent the second end of the body portion of the tubular sleeve member.

[0048] In some embodiments of the invention, the threaded portion of the tubular sleeve member may be provided with an indicator portion wherein the indicator portion may act as a visual indicator of whether the threaded portion of the tubular sleeve member has been screw-threadedly engaged to a sufficient depth within an adjustment member. The indicator portion may be located on any suitable portion of the threaded portion. However, it will be understood that the location of the indicator portion may vary depending on a number of factors, such as the size, shape and configuration of the reinforcing elements being connected, the requirements of the relevant standard and the size, shape and configuration of the coupler assembly.

Any suitable indicator portion may be used. For instance, the indicator portion may be a discontinuity in the thread in the threaded portion (such as a change in handedness, threadform, angle, lead, pitch, depth, tolerance, taper, or the like), may be a coloured portion, may be a gasket, O-ring, or the like, or any suitable combination thereof.

[0049] In some embodiments of the invention, the threaded portion of the rod member and the tubular sleeve member may be of the same handedness, threadform, angle, lead, pitch, depth, tolerance, taper, and the like, or may be different. In a preferred embodiment of the invention, the threaded portion of the rod member may be provided with an external thread having a different handedness to the threaded portion of the tubular sleeve member.

[0050] Preferably, the tubular sleeve member comprises one or more transverse bores therein. In use, it is envisaged that the one or more transverse bores may be located in the body portion of the tubular sleeve member. In a preferred embodiment of the invention, the one or more transverse bores may be spaced along the length of the tubular sleeve member. Preferably, the one or more transverse bores in the tubular sleeve member substantially align with the one or more transverse bores in the rod member when the rod member is received within the bore of the tubular sleeve member.

[0051] The one or more transverse bores may extend at least part way through the tubular sleeve member. Preferably, the tubular sleeve member may be provided with one or more pairs of transverse bores, wherein each pair member of the pair of transverse bores may be diametrically opposed to each other pair member. Preferably, the transverse bores may extend at least part way through the tubular sleeve member, such that each transverse bore may be in communication with the bore in the body portion of the tubular sleeve member. Thus, it is envisaged that each transverse bore may comprises a pair of open ends or one open end and one closed end. The transverse bores may be substantially linear, or may have a curved or tortuous path. The transverse bores may be of any suitable length and any suitable diameter. The diameter of the transverse bores may be substantially constant along its length, or may vary along its length. For instance, the transverse bores may taper along at least a portion of its length, may include a neck or similar narrowing portion, and the like.

[0052] Each transverse bore of the one or more transverse bores may be substantially similar in size, shape or configuration to each other transverse bore in the tubular sleeve member or may be different. For instance, the one or more transverse bores may be of the same diameter or may be of different diameters. Preferably, each pair member of the one or more pairs of transverse bores may be substantially similar in size, shape, and configuration to each other pair member. In use, it is envisaged that the size, shape, or configuration of the one or more transverse bores may be determined by the size, shape, or configuration of the transverse pin assemblies.

[0053] The tubular sleeve member may comprise any suitable number of transverse bores. For instance, the tubular sleeve member may comprise one transverse bore, two transverse bores, three transverse bores, four transverse bores, or the like. In some embodiments of the invention, the tubular sleeve member may comprise one transverse bore or two transverse bores. In use, it is envisaged that the number of transverse bores may be determined by the number of transverse pin assemblies located in the rod member and the tensile load specified to be carried by the joined structural elements.

[0054] The coupler assembly for joining and/or tensioning structural elements to each other may comprise one or more transverse pin assemblies. The coupler assembly may comprise any suitable number of transverse pin assemblies. For instance, the coupler assembly may comprise one transverse pin assembly, two transverse pin assemblies, three transverse pin assemblies, four transverse pin assemblies, or the like. In some embodiments of the invention, the coupler assembly may comprise one transverse pin assembly or two transverse pin assemblies. In use, it is envisaged that the number of transverse pin assemblies may be determined by the tensile load specified to be carried by the joined structural elements. [0055] In a preferred embodiment of the invention, the one or more transverse pin assemblies may be located in the rod member of the coupler assembly. Preferably, the one or more transverse pin assemblies may be located at least partially within the transverse bores in the rod member. In use, it is envisaged that the one or more transverse pin assemblies may be movably disposed within the transverse bores, wherein each of the transverse pin assemblies may be movable from a first position in which the transverse pin assembly extends at least partially out of the transverse bore and a second position in which substantially all of the transverse pin assembly is located within the transverse bore. In a preferred embodiment of the invention, the one or more transverse pin assemblies may be biased using one or more biasing members. More preferably, however, the one or more transverse pin assemblies may be spring biased. Preferably, the one or more transverse pin assemblies may be biased into an engaged condition. In this instance, it will be understood that in an engaged condition, the one or more transverse pin assemblies extends at least partially out of the transverse bore. Advantageously, the disposition of the one or more traverse pin assemblies in the transverse bores of the tubular sleeve member enables an inspector to visually confirm that the coupler assembly, and consequently the respective structural elements, may be correctly joined together.

[0056] The transverse pin assembly may comprise a first pin member, a second pin member and a biasing member between the first and second pin members. In a preferred embodiment of the invention, each of the first pin member and the second pin member may comprise a recess located in an end of the pin member, wherein the recess is configured to seat the biasing member therein. In this way, the biasing member bears against both the first pin member and the second pin member so as to bias the transverse pin assembly into an engaged condition.

[0057] The biasing member may be of any suitable size, shape or configuration. Preferably, however, the biasing member may be of sufficient size, shape or configuration to bias the first pin member against the second pin member. Any suitable biasing members may be used, such as, but not limited to, one or more pieces of compressible material. In an embodiment of the invention, the biasing member may be a spring member. [0058] The pin members may be of any suitable size, shape, or configuration. Preferably, however, the pin members may be of sufficient size, shape, or configuration so as to extend at least part way through the tubular sleeve member when the rod member is at least partially inserted into the tubular sleeve member and to resist shear forces under the tensile load specified to be carried by the joined structural elements and/or resist potential slip movement between components of the coupler assembly after engagement of the transverse pin assemblies with the transverse bores of the tubular sleeve member. In a preferred embodiment of the invention, the pin members may be cylindrical or substantially cylindrical in configuration. Preferably, the end of each of the pin members extending outwardly from the transverse bores in the rod member may be shaped. The end of the pin member may be of any suitable shape or configuration. For instance, the end of the pin member may be a convex shape, a convex radius shape, a spherical radius shape, a flat face, a concave shape, a concave radius shape, or the like. For instance, the end of the pin member may comprise a lead portion, a radius, an undercut, a step, a shoulder, or the like. Preferably, however, the shape and configuration of the end of the pin member is sufficient to facilitate the engagement of the pin member with the guide portion in the inner surface of the bore of the tubular sleeve member and to enable an inspector to visually confirm that the coupler assembly may be correctly joined together. Preferably, the engagement of each pin member of the one or more transverse pin assemblies with the one or more traverse bores of the tubular sleeve member results in an audible noise enabling a user to audibly confirm that the coupler assembly may be correctly joined together.

[0059] In some embodiments of the invention, each transverse pin assembly of the one or more transverse pin assemblies may be substantially similar in size, shape or configuration, or may be different. In this instance, it is envisaged that in coupler assemblies comprising two or more transverse pin assemblies, each transverse pin assembly may only be received within a particular transverse bore of the tubular sleeve member.

[0060] In an embodiment of the invention, the pin members may be provided with one or more recesses defined along at least a portion of the longitudinal axis of the pin member, wherein one or more locking members associated with the rod member may be in communication with the one or more pin member recesses. In use, it is envisaged that the interaction between the one or more locking members and the one or more pin member recesses substantially preclude the pin members from passing substantially out of the transverse bore. The one or more pin member recesses may be of any suitable size, shape, or configuration. Preferably, however the pin member recess may be of sufficient size, shape, or configuration to receive at least a portion of the locking member therein. Any suitable number of pin member recesses may be provided. However, it will be understood that the number of pin member recesses may vary depending on a number of factors, such as the shape, size, or configuration of the pin member and the shape, size or configuration of the rod member. In a preferred embodiment of the invention, each pin member may be provided with two diametrically opposed recesses defined along at least a portion of the longitudinal axis of the pin member.

[0061] Any suitable locking member may be used. For instance, the locking member may be a set screw, a roll pin, a spring pin, a dowel pin, a tension pin, or the like. In use, it is envisaged that the locking member may be provided with a corresponding locking member bore located in the rod portion, wherein the locking member bore may be in communication with the pin member recess. The locking member bore may be of any suitable size, shape, or configuration. Preferably, however the locking member bore may be of sufficient size, shape, or configuration to receive at least a portion of the locking member therein.

[0062] In an embodiment of the invention, the locking member bore may extend at any suitable angle to the transverse bore in the rod member, although in a preferred embodiment of the invention, the locking member bore may extend at an angle of approximately 90° relative to the transverse bore. In this instance, it is envisaged that a locking member may be inserted at least partially into the locking member bore, wherein the locking member may engage at least a portion of the pin member recess, substantially precluding the pin member from rotational movement within the transverse bore and from passing out of the transverse bore.

[0063] In an embodiment of the invention, the locking member bore may be located adjacent a transverse bore and extending at least partially along the length of the transverse bore. In this instance, it is envisaged that when the locking member bore may be aligned with the pin member recess, a locking member may be inserted at least partially into the aligned locking member bore and pin member recess, substantially precluding the pin member from rotational movement within the transverse bore and from passing out of the transverse bore.

[0064] In use, it is envisaged that the rod member of the coupler assembly may be at least partially inserted into the tubular sleeve member, such that the one or more transverse bores in the rod member align with the one or more transverse bores in the tubular sleeve member. Each pin member of the pair of pin members in the transverse pin assembly passes at least partially through the one or more transverse bores in the tubular sleeve member thereby locking the rod member and the tubular sleeve member against movement relative to one another.

[0065] The coupler assembly for joining and/or tensioning structural elements to each other may comprise a threaded nut, wherein the threaded nut may be adapted for connection to a threaded portion of the rod member and/or tubular sleeve member. Any suitable threaded nut may be used. For instance, the threaded nut may be a tension nut, a clamping nut, or the like. In some embodiments of the invention, the coupler assembly may be provided with one or more threaded nuts. In some embodiments of the invention, the threaded nuts may be of the same type, or may be of different types. However, it will be understood that the number and type of threaded nuts may vary depending on a number of factors, such as the size, shape and configuration of the reinforced structural element being connected, the requirements of the relevant standard, and the location of the threaded nuts.

[0066] The threaded nut may be located on any suitable position on the threaded portion of the rod member and/or tubular sleeve member. For instance, the threaded nut may be located in proximity to the body portion of the rod member such that in a joined condition the threaded nut may be tightened against the tubular sleeve member. For instance, the threaded nut may be located in proximity to an end of the threaded portion of the rod member and/or the tubular sleeve member such that when the threaded portion is connected to an adjustment member the threaded nut may be tightened against the adjustment member. In use, it is envisaged that the threaded nut may reduced potential slip movement of a component of the coupler assembly relative to another component of the coupler assembly. [0067] In an embodiment of the invention, the threaded nut may be configured to be tightened against the body portion of the tubular sleeve member to substantially preclude movement of the rod member within the bore of the tubular sleeve member after the rod member and tubular sleeve member have been assembled. In this instance, it is envisaged that the threaded nut may preclude movement of the rod member within the bore of the tubular sleeve member reducing potential slip movement, or relative displacement, between the components of the coupler consistent with the requirements for couplers for the mechanical splicing of steel reinforcing bars as set out in Australian Standard (AS) 3600:2018 and International Organisation for Standardisation (ISO) 15835-3 and other relevant Australian and/or international standards. Further, precluding movement of the rod member within the bore of the tubular sleeve member decreases the risk of the transverse pin assemblies compressing and/or deforming after engagement with the transverse bores of the tubular sleeve member.

[0068] A coupler assembly for joining and/or tensioning structural elements to each other comprises a first adjustment member comprising a first end and an opposed second end, wherein the first end is adapted for connection with a first structural element and the opposed second end is adapted for connection to the threaded portion of the rod member, and a second adjustment member comprising a first end and an opposed second end, wherein the first end is adapted for connection with a second structural element and the opposed second end is adapted for connection to the threaded portion of the tubular sleeve member.

[0069] Any suitable adjustment member may be used. In some embodiments of the invention, the first adjustment member and the second adjustment member may of the same type, or of different types.

[0070] The adjustment member preferably comprises a first end and an opposed second end and a bore extending at least part way through the first adjustment member from the first end to the second end. In an embodiment of the invention, the bore may extend all the way through the adjustment member from the first end to the second end thereof. In use, it is envisaged that the first end of the bore may be configured to receive at least a portion of the threaded portion of the rod member and/or the tubular sleeve member therein and the second end of the bore may be configured to receive at least a portion of a structural element therein.

[0071] In a preferred embodiment of the invention, the adjustment member may comprise a first bore portion extending from the first end at least part way through the first adjustment member and a second bore portion extending from the second end at least part way through the adjustment member, wherein the first bore portion and the second bore portion comprise an open end and a closed end. In this instance, it will be understood that the bore of the adjustment member may not be continuous along the length of the adjustment member. In use, it is envisaged that the first bore portion may be configured to receive at least a portion of the threaded portion of the rod member and/or the tubular sleeve member therein and the second bore portion may be configured to receive at least a portion of a structural element therein.

[0072] The bore and/or bore portions may be substantially linear, or may have a curved or tortuous path. The bore and/or bore portions may be of any suitable length and any suitable diameter. The diameter of the bore and/or bore portions may be substantially constant along its length, or may vary along its length. For instance, the bore and/or bore portions may taper along at least a portion of its length, may include a neck or similar narrowing portion, and the like.

[0073] The adjustment member may be of any suitable size, shape or configuration. Preferably, however the adjustment member may be of sufficient size, shape, or configuration so as to receive at least a portion of the threaded portion of the rod member and/or the tubular sleeve member and at least a portion of a structural element therein. In a preferred embodiment of the invention, the bore and/or the bore portions of the adjustment member may be cylindrical or substantially cylindrical in configuration as the structural elements to be joined are usually substantially cylindrical.

[0074] In a preferred embodiment of the invention, the adjustment member may be adapted for connection to the rod member and/or the tubular sleeve member. Preferably, the adjustment member may be adapted for adjustable connection with a threaded portion of the rod member and/or the tubular sleeve member. The adjustment member may be adjustably connected to the threaded portion of the rod member and/or tubular sleeve member using any suitable mechanism. For instance, the adjustment member may be adjustably connected by frictional engagement, or by providing complementary screw-threaded portions, male-female connectors, or combinations thereof. Preferably, the adjustment member may be retained in screw- threaded engagement with the rod member and/or tubular sleeve member.

[0075] In some embodiments of the invention, the threaded portion of the rod member and/or the tubular sleeve member may be locked against the adjustment member such that the movement of a component of the coupler assembly relative to another component of the coupler assembly may be substantially precluded. The threaded portion may be locked against the adjustment member by any suitable means. For instance, the threaded portion may be connected to at least a portion of the adjustment member by one or more mechanical fasteners (such as, but not limited to, one or more screws, nails, bolts, pins, rivets, or the like), by use of a mechanical fastener such as a threaded nut (such as a tension nut, a clamping nut, or the like), by frictional engagement (such as, but not limited to the pressure fit of the threaded portion within the adjustment member, swaging, crimping, or the like), by complementary connection portions (such as, but not limited to, screw-threaded engagement portions), by adherence to the adjustment using any suitable technique such as a heat treatment or chemical treatment (such as, but not limited to, an adhesive, an adhesive tape, friction welding, impulse welding, thermal welding, fusion welding, laser beam welding, arc welding, induction welding, chemical welding, or the like), or any suitable combination thereof.

[0076] The adjustment member may be provided with one or more internal threads located within the bore and/or the bore portions of the adjustment member. The one or more internal threads may extend at least part way along the length of the bore and/or the bore portions of the adjustment member or substantially the entire length of the bore and/or the bore portions. In some embodiments of the invention, at least a portion of the bore and/or the bore portions may not be provided with an internal thread. The one or more internal threads may be of the same handedness, threadform, angle, lead, pitch, depth, tolerance, taper, or the like, or may be different. In some embodiments of the invention, wherein the bore of the adjustment member comprises two or more internal threads, the two or more internal threads may have the same handedness or different handedness.

[0077] In a preferred embodiment of the invention, the adjustment member may be adapted for connection with a structural element. In some embodiments of the invention, the adjustment member may be permanently connected to the structural element or removably connected to the structural element. The adjustment member may be connected to the structural element by any suitable means. For instance, the adjustment member may be connected to at least a portion of the structural element by one or more mechanical fasteners (such as, but not limited to, one or more screws, nails, bolts, pins, rivets, or the like), by frictional engagement (such as, but not limited to the pressure fit of the structural element within the adjustment member, swaging, crimping, or the like), by complementary connection portions (such as, but not limited to, screw-threaded engagement portions), by adherence to the structural element using any suitable technique such as a heat treatment or chemical treatment (such as, but not limited to, friction welding, impulse welding, thermal welding, fusion welding, laser beam welding, arc welding, induction welding, chemical welding, or the like), or any suitable combination thereof.

[0078] In a preferred embodiment of the invention, at least a portion of the structural element and at least a portion of the adjustment member may be provided with a complementary threaded portions. In a preferred embodiment of the invention, at least a portion of the structural element and at least a portion of the adjustment member may be fusion welded. In a preferred embodiment of the invention, at least a portion of the structural element and at least a portion of the adjustment member may be crimped or swaged together.

[0079] In some embodiments of the invention, the adjustment members may be provided with a gripping portion on an external surface thereof. Any suitable gripping portion may be used. For instance, the gripping portion may be a hexagonal nut, a threaded portion, a machined portion, a sleeve crimped or swaged onto the adjustment member, or any suitable combination thereof. Preferably, however, the gripping portion may be of sufficient size, shape and configurations so as to be used by a user to be gripped by a user to adjust the respective adjustment members on or off the respective structural element and/or adjust the respective threaded portions of the rod member and the tubular sleeve member in or out of the respective first and second adjustment members.

[0080] In use, rotation of the coupler assembly adjusts the respective threaded portions of the rod member and the tubular sleeve member in or out of the respective first and second adjustment members thereby adjusting the total length of the coupler assembly and the distance between the joined structural elements. In this instance, it will be understood that the threaded portions of the rod member and the tubular sleeve member move simultaneously. In use, it is envisaged that rotating the respective threaded portions of the rod member and the tubular sleeve member into the respective first and second adjustment member may tension the joined structural elements. Advantageously, as rotation of the coupler assembly adjusts both threaded portions in or out of the adjustment members at the same time, a relatively small degree of rotation may be required to adjust the total length of the coupler assembly and thereby the amount of tension on the joined structural elements relative to a coupler which rotates about a single threaded portion in order to adjust the length of the coupler.

[0081] In a second aspect, the invention resides broadly in a system for joining and/or tensioning reinforced concrete elements, the system comprising one or more coupler assemblies for joining and/or tensioning one or more structural elements, and one or more reinforced concrete elements, wherein the reinforced concrete elements comprise the one or more structural elements therein.

[0082] Preferably, the coupler assemblies of the second aspect of the invention are the coupler assemblies of the first aspect of the invention.

[0083] The coupler assemblies may be used to join and/or tension one or more reinforced concrete elements. The one or more reinforced concrete elements may be of any suitable type used in the building, construction, infrastructure and civil works areas. For instance, a foundation, a beam, a column, a slab, a shear wall, an elevator shaft, a spandrel, a flooring panel, a wall panel, a segmental bridge unit, a segmental tunnel unit a bulb-tee girder, an I-beam girder, a lintel, a hollow core plank, a driven pile, a concrete pipe, or the like. Preferably, the reinforced concrete elements comprise one or more structural elements therein. The reinforced concrete elements may be pre-stressed, pre-tensioned, post-tensioned, or any suitable combination thereof.

[0084] In an embodiment of the invention, the coupler assembly may be used to pre-tension a reinforced concrete element. In this instance, it is envisaged that the coupler assembly may be used to join and/or tension one or more structural elements to an anchorage member (such as, but not limited to, an abutment, a buttress, or the like) and/or to a tensioning jack prior to the concrete being placed in a prestressing bed. It will be understood that releasing the tension in the structural elements after the concrete has hardened will transfer the load to the concrete through the bond between the structural elements and the concrete, inducing compressive force in the reinforced concrete element and pre-compressing or pre-stressing the concrete.

[0085] In an embodiment of the invention, the coupler assembly may be used to post-tension a reinforced concrete element. In this instance, it is envisaged that the coupler assembly may be used to join and/or tension one or more structural elements located within a reinforced concrete element after the concrete has been hardened.

It will be understood that in post-tensioning as the structural elements are tensioned the concrete is “squeezed” or “compacted” which induces compressive forces in the reinforced concrete element. The tensioned structural elements are anchored to keep the structural elements in tension, pre-compressing or pre-stressing the concrete.

[0086] In an embodiment of the invention, the coupler assembly may be used to join and/or tension adjacent structural elements located within a reinforced concrete element. In this instance, it will be understood that the coupler assembly creates a mechanical connection between the adjacent structural elements in the reinforced concrete element and the coupler assembly adjusted to tension the adjacent reinforced concrete elements.

[0087] In an embodiment of the invention, the one or more reinforced concrete elements may be provided with one or more partially assembled coupler assemblies connected to one or more structural elements therein. In this instance, it is envisaged that the system for joining and/or tensioning reinforced concrete elements may be in a ready to assemble form. Any suitable portion of the coupler assembly may be connected to the one or more structural elements. For instance, an adjustment member may be connected to a structural element, a rod member and a first adjustment member may be connected to a structural element, a tubular sleeve member and a second adjustment member may be connected to a structural element, or any suitable combination thereof.

[0088] In use, it is envisaged that the coupler assembly may lock securely upon engagement, facilitating quick, safe levelling and two-way height adjustment to accommodate the specified thickness of the floor slab between two self-supporting columns. In use, it is envisaged that the coupler assembly enables opposing concrete elements to be easily aligned and connected to one another, such that the joined coupler assembly may be load bearing as soon as the coupler assembly is joined. In use, it is envisaged that providing the system for joining and/or tensioning one or more reinforced concrete elements may reduce build time on site by reducing the time needed to set up formwork, connect the structural elements, brace the reinforced concrete elements, and/or place and connect the reinforced concrete elements. In use, it is envisaged that providing the system for joining and/or tensioning one or more reinforced concrete elements may improve the ease of assembly in confined or inaccessible spaces (such as at height or underground) as less equipment may be required to build and assemble the reinforced concrete elements.

[0089] In a third aspect, the invention resides broadly in a method for joining and/or tensioning structural elements to each other, the method comprising the steps of:

(a) connecting a first adjustment member to a first structural element and a second adjustment member to a second structural element;

(b) connecting a tubular sleeve member to the first adjustment member and a rod member to the second adjustment member;

(c) inserting the rod member into the tubular sleeve member such that one or more transverse pin assemblies located in the rod member pass at least partially through one or more transverse bores in the tubular sleeve member, thereby locking the rod member and the tubular sleeve member against movement relative to one another to form a coupler assembly; and

(d) rotating the coupler assembly relative to the respective first and second adjustment members thereby adjusting the total length of the coupler assembly and the tension in the first and second structural elements.

[0090] Preferably, the first adjustment member, the second adjustment member, the rod member, the tubular sleeve member and the transverse pin assemblies of the third aspect of the invention are the first adjustment member, the second adjustment member, the rod member, the tubular sleeve member and the transverse pin assemblies of the first aspect of the invention.

[0091] The method for joining and/or tensioning structural elements to each other comprises the step of connecting a first adjustment member to a first structural element and a second adjustment member to a second structural element. In a preferred embodiment of the invention, at least a portion of the structural element may be connected to at least a portion of the adjustment member using one or more techniques selected from the group of screw- threaded engagement, fusion welding, crimping or swaging.

[0092] Preferably, the first structural element may be associated with a first reinforced concrete element and the second structural element may be associated with an adjacent second reinforced concrete element. However, it will be understood that the coupler assembly may be used to join any suitable structure comprising structural elements together.

[0093] The method for joining and/or tensioning structural elements to each other comprises the step of connecting a tubular sleeve member to the first adjustment member and a rod member to the second adjustment member. In a preferred embodiment of the invention, the threaded portion of the tubular sleeve member may be screw-threadedly engaged with the first adjustment member and the threaded portion of the rod member may be screw-threadedly engaged with the second adjustment member. Preferably, the threaded portion of the rod member may be provided with an external thread having a different handedness to the threaded portion of the tubular sleeve member. Preferably, however, the threadform, angle, lead, pitch, depth, tolerance, taper, and the like, of the threaded portion of the rod member and the threaded portion of the tubular sleeve member may be substantially similar. In use, it is envisaged that providing each of the threaded portions of the rod member and the tubular sleeve member with similar characteristics enables a user to adjust the length of the coupler assembly relative to each adjustment member equally.

[0094] Alternatively, in some embodiments of the invention, one or more characteristics of the threaded portions may differ. For instance, a longer thread pitch on the threaded portion of the rod member may cause it to rotate within the second adjustment member faster and as a consequence result in this portion of the coupler assembly being effectively longer than the tubular sleeve member portion of the coupler assembly. In other embodiments of the invention, the adjustment members may be of different take up lengths.

[0095] The method for joining and/or tensioning structural elements to each other comprises the step of inserting the rod member into the tubular sleeve member. Preferably, the opening and/or the bore of the tubular sleeve member may comprise a guide portion, wherein the guide portion assists in aligning the one or more transverse pin assemblies with the one or more transverse bores of the tubular sleeve member as the rod member is inserted into the tubular sleeve member. In use, it is envisaged that one or more transverse pin assemblies located in one or more transverse bores in the rod member may be substantially received within the transverse bores whilst the opening of the transverse bores are occluded by the body portion of the tubular sleeve member. As the one or more transverse bores of the rod member align with one or more transverse bores in the tubular sleeve member, each pin member of the pair of pin members in the transverse pin assembly passes at least partially through the one or more transverse bores in the tubular sleeve member thereby locking the rod member and the tubular sleeve member against movement relative to one another.

[0096] The method for joining and/or tensioning structural elements to each other comprises the step of rotating the coupler assembly relative to the respective first and second adjustment members. As the coupler assembly may be rotated, the threaded portions of the rod member and tubular sleeve member are moved into or out of respective adjustment members. In this instance, it will be understood that only the coupler assembly move when tensioning. As the threaded portions move into or out of the respective adjustment members, the total length of the coupler assembly and thereby the distance between the first reinforced concrete element and the second reinforced concrete element is adjusted. Rotating the coupler assembly, such that the threaded portions move into the respective adjustment members, tensions and effectively joins the structural elements.

[0097] The present invention provides numerous advantages over the prior art. For instance, the present invention provides the ability to adjust the length of the coupler assembly for joining and/or tensioning structural elements thereby allowing a user to easily correct for variations in bar length and ensuring tolerances in construction are achieved. In addition, the present invention enables an inspector to confirm that the coupler assembly and connecting structural elements are correctly joined together by visual inspection. Further, the present invention provides improved safety for a user when joining and/or tensioning structural elements associated with reinforced concrete elements as the coupler assembly may be load bearing as soon as the coupler assembly is joined, enabling quick, safe height adjustment and levelling of the self-supporting structure. In addition, the system of the present invention may improve the cost effectiveness and reduce the build time to assemble or tension reinforced concrete elements on site by providing reinforced concrete elements with partially assembled coupler assemblies preconnected to the reinforced concrete elements.

[0098] 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 invention.

[0099] 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. BRIEF DESCRIPTION OF DRAWINGS

[0100] Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows:

[0101] Figure 1 illustrates a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention in an assembled state;

[0102] Figure 2 illustrates a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention in a disassembled state;

[0103] Figure 3 illustrates an end view of a tubular sleeve member of a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention;

[0104] Figure 4 illustrates a rod member of a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention;

[0105] Figure 5A illustrates a transected view of a rod member according to an embodiment of the invention, wherein a pin member is in an engaged condition;

[0106] Figure 5B illustrates a transected view of a rod member according to an embodiment of the invention, wherein a pin member is in a disengaged condition;

[0107] Figure 6 illustrates a transected view of a rod member according to an embodiment of the invention, wherein a pair of pin members are is in a disengaged condition; [0108] Figure 7 illustrates a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention in an assembled state;

[0109] Figure 8 illustrates a rod member of a coupler assembly for joining and/or tensioning structural elements to each other according to an embodiment of the invention in a disassembled state;

[0110] Figure 9 illustrates a system for joining and/or tensioning reinforced concrete elements together using a coupler assembly according to an embodiment of the invention;

[0111] Figure 10 illustrates a system for joining and/or tensioning reinforced concrete elements together using a coupler assembly according to an embodiment of the invention in a non-tensioned condition;

[0112] Figure 11 illustrates a system for joining and/or tensioning reinforced concrete elements together using a coupler assembly according to an embodiment of the invention in a tensioned condition; and

[0113] Figure 12 illustrates a system for joining and/or tensioning reinforced concrete elements together using a coupler assembly according to an embodiment of the invention in a tensioned condition.

DESCRIPTION OF EMBODIMENTS

[0114] In Figures 1 and 2, a coupler assembly 200 for joining and/or tensioning structural elements to each other is illustrated. Coupler assembly 200 comprises a rod member 10 having one or more transverse bores 18 therein and a threaded portion 14 at one end thereof and a tubular sleeve member 20 having one or more transverse bores 28 therein and a threaded portion 26 at one end thereof. A transverse pin assembly 16 may be located at least partially within the transverse bores 18 in the rod member 10, wherein each transverse pin assembly 16 comprises a pair of pin members 40,40 biased into an engaged condition.

[0115] In Figure 1, the rod member 10 is at least partially inserted into the tubular sleeve member 20 such that the one or more transverse bores 18 in the rod member 10 align with the one or more transverse bores 28 in the tubular sleeve member 20 such that each transverse pin assembly 16 passes at least partially through the one or more transverse bores 28 in the tubular sleeve member 20 thereby locking the rod member 10 and the tubular sleeve member 20 against movement relative to one another.

[0116] First adjustment member 30 is adapted for connection with a first structural element (not shown) and the opposed second end of the first adjustment member 30 is screw threadedly engaged with threaded portion 14 of rod member 10, up to indicator portion 15 in the form of a discontinuity in the thread of the threaded portion 14. Second adjustment member 32 is adapted for connection with a second structural element (not shown) and the opposed second end of second adjustment member 32 is screw threadedly engaged with threaded portion 26 of tubular sleeve member 20, up to indicator portion 27 in the form of a discontinuity in the thread of the threaded portion 26. In use, rotation of the coupler assembly (joined rod member 10 and tubular sleeve member 20) adjusts the respective threaded portions 14,26 of the rod member 10 and the tubular sleeve member 20 in or out of the respective first and second adjustment members 30,32 thereby adjusting the total length of the coupler assembly.

[0117] In Figure 3, an end view of a tubular sleeve member 20 is illustrated.

T ubular sleeve member 20 comprises an opening 136 at the first end of body portion 22 and transverse bores 28,28 located in body portion 22. Preferably, the opening 136 and/or at least a portion of the bore 24 of the tubular sleeve member 20 may be provided with one or more guide portions 138,140, wherein the one or more guide portions 138,140 may be configured to ease insertion of the rod member (not shown) into tubular sleeve member 20. In use, it is envisaged that the one or more guide portions 138,140 may be configured to engage one or more transverse pin assemblies (not shown) of the rod member (not shown), such that the contact between the one or more guide portions 138,140 may assist in aligning the one or more transverse pin assemblies (not shown) with the one or more transverse bores 28,28 of tubular sleeve member 20 as the rod member (not shown) is inserted into tubular sleeve member 20. [0118] In Figures 4-6, a transverse pin assembly 16 comprises a pair of pin members 40,40 and a spring member (not shown) between the first and second pin members 40 is illustrated. A recess 42 located in an end of each pin member 40 is configured to seat the spring member 50 therein. A pin member recess 44 is defined along at least a portion of the longitudinal axis of each pin member 40, wherein a locking member 46 associated with rod member 10 may be in communication with the pin member recess 44. A locking member bore 48 may extend at angle of approximately 90° relative to a transverse bore 18 and is configured to receive at least a portion of the locking member 46 therein. Locking member 46 may be inserted at least partially into the locking member bore 48 and may engage with at least a portion of the pin member recess 44, substantially precluding the pin member 40 from rotational movement within the transverse bore 10 and from passing out of the transverse bore 10.

[0119] In Figures 5A, 5B and 6, it is envisaged that locking member (not shown) is inserted into locking member bore 48 and is in communication with pin member recess 44. In Figure 5A, a transverse pin assembly 16 is shown in an engaged condition, that is pin member 40 extends at least part way out of transverse bore 18 of the rod member 12. In Figure 5B, force may be applied to pin member 40 causing it to move against the force of spring member (not shown) until it is located within the transverse bore 18 of rod member 12 and in a disengaged condition. In use, locking member (not shown) is slidably engaged with pin member recess 44 and is restrained in movement by the length of pin member recess 44. In Figure 6, a transverse pin assembly 16 showing a pair of pin members 40 is shown in a disengaged condition.

[0120] In Figures 7 and 8, a coupler assembly 300 and a rod member 60 comprising two transverse pin assemblies is illustrated. Coupler assembly 300 comprises a tubular sleeve member 70 comprising two transverse bores 72, 74 each configured to receive a transverse pin assembly. Rod member 60 comprises two transverse pin assemblies, each transverse pin assembly comprising a pair of pin members 76a, b and a spring member 84 between the first and second pin members 76a, b. A recess 78a, b located in an end of each pin member 76a, b is configured to seat the spring member 84 therein. A pin member recess 80a, b is defined along at least a portion of the longitudinal axis of each pin member 76a, b, wherein a locking member 82a, b associated with rod member 60 may be in communication with the pin member recess 80a, b. A locking member bore 68a, b may be located adjacent a transverse bore 66 and is configured to receive at least a portion of the locking member 82a, b therein. The locking member bore 68a, b may be aligned with the pin member recess 80a, b and a locking member 82a, b may be inserted at least partially into the aligned locking member bore 68a, b and pin member recess 80a, b, substantially precluding the pin member 76a, b from rotational movement within the transverse bore 66 and from passing fully out of the transverse bore 66.

[0121] In Figure 9, a system 90 for joining and/or tensioning reinforced concrete elements together using a coupler assembly in situ is illustrated. Adjustment members (not shown) are connected to respective structural elements (not shown) within adjacent reinforced concrete elements 86,88 and concreted in place.

Threaded portion 96 of tubular sleeve member 92 is connected to second adjustment member (not shown) and threaded portion 98 of rod member 94 is connected to first adjustment member (not shown). Upper reinforced concrete element 86 is lowered towards lower reinforced concrete element 88 until rod member 94 is received within the bore of tubular sleeve member 92 and transverse pin assemblies 95 located in rod member 94 engage with aligned transverse bores 93 located in tubular sleeve member 92 to lock rod member 94 and tubular sleeve member 92 against movement relative to one another.

[0122] In Figure 10, a system 100 for joining and/or tensioning reinforced concrete elements together using a coupler assembly in a nontensioned condition is illustrated. Adjustment members 110,116 are connected to structural elements 104,108 located in adjacent reinforced concrete elements 102,106 and concreted in place. Threaded portion 126 of tubular sleeve member 122 is connected to second adjustment member 116 and threaded portion 132 of rod member 128 is connected to first adjustment member 110. Guide portions 129 in tubular sleeve member 122 facilitate the receival of rod member 128 within the bore of tubular sleeve member 122 and transverse pin assembly 130 located in rod member 128 is engaged with aligned transverse bores 124 located in tubular sleeve member 122 to lock rod member 128 and tubular sleeve member 122 against movement relative to one another. [0123] A tension nut 134 may be located on threaded portion 132 of rod member 128 and tightened until it abuts tubular sleeve member 122, substantially precluding movement of rod member 128 out of the bore of tubular sleeve member 122.

[0124] In Figure 11, a system 100 for joining and/or tensioning reinforced concrete elements together using a coupler assembly in a tensioned condition is illustrated. Threaded portion 132 of rod member 128 comprises a left-handed thread and threaded portion 126 of tubular sleeve member 122 comprises a right-handed thread. Rotation of the coupler assembly 128,122 has moved the threaded portions 132,126 of the rod member 128 and tubular sleeve member 122 into the respective adjustment members 110,116 to shorten the distance between adjacent reinforced concrete elements 102,106. In use, rotating the coupler assembly 128,122 may tension the structural elements 104,108 in adjacent reinforced concrete elements 102,106. It is envisaged that the coupler assembly may be used to pre-tension or post-tension structural elements in reinforced concrete elements.

[0125] In Figure 12, a system 150 for joining and/or tensioning reinforced concrete elements together using a coupler assembly 156,164 is illustrated. A tension nut 152 may be located on the threaded portion 154 of rod member 156 and tightened until it abuts the adjustment member 158, substantially precluding movement of the rod member 156 out of the adjustment member 158. System 150 further comprises a tension nut 160 located on the threaded portion 162 of tubular sleeve member 156 and tightened until it abuts the adjustment member 158, substantially precluding movement of the rod member 156 out of the adjustment member 158.

[0126] In the present specification and claims (if any), the word ‘comprising’ and its derivatives including ‘comprises’ and ‘comprise’ include each of the stated integers but does not exclude the inclusion of one or more further integers.

[0127] 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 invention. 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.

[0128] In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect. The invention 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.

Claims

1. A coupler assembly for joining and/or tensioning structural elements to each other, the assembly comprising: a rod member having one or more transverse bores therein and a threaded portion at one end thereof; a tubular sleeve member having one or more transverse bores therein and a threaded portion at one end thereof; and one or more transverse pin assemblies located at least partially within the transverse bores in the rod member, wherein each transverse pin assembly comprises a pair of pin members biased into an engaged condition, wherein, in use, the rod member is at least partially inserted into the tubular sleeve member such that when the one or more transverse bores in the rod member align with the one or more transverse bores in the tubular sleeve member, each transverse pin assembly passes at least partially through the one or more transverse bores in the tubular sleeve member thereby locking the rod member and the tubular sleeve member against movement relative to one another to form the coupler assembly.

2. A coupler assembly according to claim 1 , further comprising a first adjustment member comprising a first end and an opposed second end, wherein the first end is adapted for connection with a first structural element and the opposed second end is adapted for connection to the threaded portion of the rod member, and a second adjustment member comprising a first end and an opposed second end, wherein the first end is adapted for connection with a second structural element and the opposed second end is adapted for connection to the threaded portion of the tubular sleeve member, wherein rotation of the coupler assembly adjusts the respective threaded portions of the rod member and the tubular sleeve member in or out of the respective first and second adjustment members thereby adjusting the total length of the coupler assembly.

3. A coupler assembly according to claim 2, wherein the threaded portion of the rod member and/or the tubular sleeve member is provided with one or more indicator portions, wherein in use, the indicator portion is a visual indicator of whether the threaded portion of the rod member and/or the tubular sleeve member has been screw- threadedly engaged to a sufficient depth within the first and/or the second adjustment member.

4. A coupler assembly according to claim 3, wherein the indicator portion is a discontinuity in the threaded portion of the rod member and/or the tubular sleeve member.

5. A coupler assembly according to any one of claims 1 to 4, further comprising one or more threaded nuts, wherein the one or more threaded nuts are configured to substantially preclude movement of the rod member within the bore of the tubular sleeve member and/or substantially preclude movement of the threaded portion of the rod member and/or the tubular sleeve member within the first and/or the second adjustment member.

6. A coupler assembly according to any one of claims 1 to 5, wherein the tubular sleeve member comprises one or more guide portions, wherein the one or more guide portions are configured to align the rod member with the tubular sleeve member and/or ease insertion of the rod member into the tubular sleeve member.

7. A coupler assembly according to claim 6, wherein the one or more guide portions comprises a lead in chamfer.

8. A coupler assembly according to any one of claims 1 to 7, wherein each transverse pin assembly comprises a first pin member and a second pin member and a biasing member therebetween, wherein the biasing member bears against both the first pin member and the second pin member so as to bias the transverse pin assembly into an engaged condition.

9. A coupler assembly according to any one of claims 1 to 8, wherein each pin member of the transverse pin assembly is provided with one or more recesses defined along at least a portion of the longitudinal axis of the pin member, wherein one or more locking members associated with the rod member are in communication with the one or more pin member recesses so as to substantially preclude the pin member from rotational movement within the transverse bore and/or from passing fully out of the transverse bore.

10. A system for joining and/or tensioning reinforced concrete elements, the system comprising one or more coupler assemblies for joining and/or tensioning one or more structural elements, and one or more reinforced concrete elements, wherein the reinforced concrete elements comprise the one or more structural elements.

11. A system for joining and/or tensioning reinforced concrete elements according to claim 10, further comprising one or more adjustment members, wherein the one or more adjustment members are adapted for connection with a structural element at a first end thereof and with a coupler assembly at an opposed second end thereof, wherein, rotation of the one or more coupler assemblies adjusts the one or more coupler assemblies in or out of the respective adjustment members thereby adjusting the total length of the coupler assembly.

12. A system for joining and/or tensioning reinforced concrete elements according to claim 10 or claim 11, wherein the one or more coupler assemblies are used to pre tension the one or more reinforced concrete elements.

13. A system for joining and/or tensioning reinforced concrete elements according to claim 10 or claim 11, wherein the one or more coupler assemblies are used to post-tension the one or more reinforced concrete elements.

14. A system for joining and/or tensioning reinforced concrete elements according to any one of claims 10 to 13, wherein the one or more coupler assemblies are used to join and/or tension adjacent structural elements located within a reinforced concrete element.

15. A system for joining and/or tensioning reinforced concrete elements according to any one of claims 10 to 14, wherein the one or more coupler assemblies comprise the coupler assembly of any one of claims 1 to 9.

16. A method for joining and/or tensioning structural elements to each other, the method comprising the steps of

(c) inserting the rod member into the tubular sleeve member such that one or more transverse pin assemblies located in the rod member passes at least partially through one or more transverse bores in the tubular sleeve member, thereby locking the rod member and the tubular sleeve member against movement relative to one another to form a coupler assembly; and

17. A method for joining and/or tensioning structural elements to each other according to claim 16 wherein the coupler assembly comprises the coupler assembly of any one of claims 1 to 9.