AU2005201878A1 - Structural members for composite slabs - Google Patents
Structural members for composite slabs Download PDFInfo
- Publication number
- AU2005201878A1 AU2005201878A1 AU2005201878A AU2005201878A AU2005201878A1 AU 2005201878 A1 AU2005201878 A1 AU 2005201878A1 AU 2005201878 A AU2005201878 A AU 2005201878A AU 2005201878 A AU2005201878 A AU 2005201878A AU 2005201878 A1 AU2005201878 A1 AU 2005201878A1
- Authority
- AU
- Australia
- Prior art keywords
- structural member
- profiled decking
- composite slab
- sheet
- structural
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): BLUESCOPE STEEL LIMITED Invention Title: STRUCTURAL MEMBERS FOR COMPOSITE SLABS The following statement is a full description of this invention, including the best method of performing it known to me/us: 2 STRUCTURAL MEMBERS FOR COMPOSITE SLABS The present invention relates to a structural member for a composite slab.
00 The present invention relates particularly, lr- 00 although by no means exclusively, to a structural member for use in the construction of composite slabs for floors.
SIn the context of the construction of floors, C1 the term "composite slabs" is understood here to mean slabs that include a base formed from a plurality of profiled decking sheets positioned in side-by-side and/or end-to-end overlapping relationship as required; a layer of concrete on the base; and reinforcement embedded in the concrete layer.
Typically, composite floor slabs are formed in situ by positioning a plurality of the profiled decking sheets onto a support structure, such as a series of horizontal beams, positioning formwork that defines the perimeter of the composite slabs, placing reinforcement, typically in the form of flat sheets of steel mesh on or in relation to the profiled decking sheets, and finally pouring concrete onto the assembly of the decking sheets and reinforcement within the perimeter of the formwork and forming a layer of concrete.
The profiled decking sheets have two functions.
Firstly, the profiled decking sheets are part of the formwork for retaining concrete poured onto the structure.
Secondly, after the concrete has set and cured, the profiled decking sheets act compositely with the H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05
I
3 Sconcrete via mechanical bond and therefore contribute to
(N
the bottom reinforcement of the composite slab.
The term "profiled decking sheet" is understood here to mean roll-formed sheets that include flat pans separated by one or more parallel upstanding ribs and side 00 edge formations that enable adjacent sheets to be 00 positioned together in side-by-side overlapping relationship.
C STypically, currently available profiled decking C1 sheets are supplied cut to length (6 to 9 m) in 0.6 m width. The maximum unsupported spans of profiled decking sheets is currently up to 3 m.
At least in part, the above-described maximum length and maximum width are set by issues relating to the structural performance of the profiled decking sheets as formwork.
In addition, at least in part, the above described maximum length and maximum width are set by issues relating to handling the profiled decking sheets in order to transport the profiled decking sheets to a building site and thereafter into position on the building site.
The present invention is based on the realisation that longer unsupported spans and/or wider structural decking sheets can be used by mechanically connecting together profiled decking sheets and composite slab reinforcement prior to placing the profiled decking sheets in required structural formwork positions on a building site.
According to the present invention there is provided a structural member for a composite slab that H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05 4 Sincludes a profiled decking sheet and composite slab
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reinforcement mechanically connected to the profiled decking sheet.
The term "composite slab reinforcement" as used herein is understood to mean reinforcement other than 00 reinforcement in the form of a truss.
00 The term "truss" is understood herein to mean a C1 0 framed structure built up entirely from tension and Scompression members arranged so as to be stable under load C1 used for supporting loads over long spans. This definition is taken from Chambers Science and Technology Dictionary.
Preferably the profiled decking sheet includes a plurality of flat pans separated by parallel upstanding ribs and side edge formations that allow adjacent profiled decking sheets to be positioned in side-by-side overlapping relationship.
The composite slab reinforcement may be any suitable reinforcement.
Preferably composite slab reinforcement is a flat sheet of steel mesh.
The profiled decking sheet and the composite slab reinforcement may be mechanically interconnected by any suitable means, such as welding and clinching.
Preferably the profiled decking sheet and the composite slab reinforcement are mechanically interconnected by welding the profiled decking sheet and the reinforcement together.
H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05 5 SThe above-described structural member may be
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manufactured at a location remote from a building site and thereafter transported to the building site.
Alternatively, the above-described structural member may be manufactured at a building site.
00 00 Typically, the structural member is at least 4 m in length.
SAccording to the present invention there is C1 provided a method of manufacturing the above-described structural member that includes mechanically connecting together the profiled decking sheet and composite slab reinforcement prior to placing the profiled decking sheet in a required structural formwork position on a building site.
The present invention is described further by way of example with reference to the accompanying drawing which is a sketch of one embodiment of a structural member in accordance with the present invention.
The structural member shown in the drawing includes a profiled decking sheet 3 and a composite slab reinforcement in the form of a flat sheet of mesh 5 that are welded together. The structural member is manufactured in the form shown in the drawing prior to placing the profiled decking sheet 3 in a required structural formwork position on a building site.
The profiled decking sheet 3 is a standard construction that includes three flat pans 7 separated by two parallel upstanding ribs 9 and side edge formations 11 that allow adjacent profiled decking sheets to be positioned in side-by-side overlapping relationship.
H:\GRM\Keep\Speci\Bluescope\Structura1 formworl: member Modification.doc 4/05/05 6 The flat sheet of mesh 5 is a standard arrangement of parallel line wires 13 and parallel crosswires 15 that are welded together at the intersections of the wires.
The flat sheet of mesh 5 is positioned on the 00 profiled decking sheet 3 and is welded to the top walls of 00 the ribs 9 and may include the side edge formations 11.
C1 0 Consequently, the structural member has a more rigid structure than a profiled decking sheet 3 per se and CI can be more readily handled and transported to a required position on a building site and is more self-supporting than a profiled decking sheet 3 per se. This is a significant advantage.
Moreover, the more rigid structure makes it possible for the structural member to be longer and/or wider than currently available profiled decking sheets.
Specifically, the applicant envisages that the structural member may be at least 4m in span unsupported. This is also a significant advantage.
Whilst the span and strength of the profiled decking sheet is considered to be in the direction of the parallel upstanding ribs 9, it is envisaged that the flat sheet of mesh 5 positioned on the profiled decking sheet will contribute to the strength of the structural member and hence the composite slab in the transverse direction to the upstanding ribs.
Many modifications may be made to the embodiment of the present invention described above without departing from the spirit and scope of the invention.
By way of example, whilst the profiled decking sheet 3 of the embodiment shown in the drawing includes H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05 7 three flat pans 7 separated by two parallel upstanding ribs 9 and side edge formations 11, the present invention is not so limited and extends to any suitable form of decking sheet.
In addition, whilst the composite slab reinforcement 00 of the embodiment shown in the drawing is in the form of a 00 flat mesh sheet 5, the present invention is not so limited and extends to any suitable form of reinforcement.
C! 0 In addition, whilst the profiled decking sheet 3 and C- the flat mesh sheet 5 of the embodiment shown in the drawing are mechanically interconnected by welding, the present invention is not so limited and extends to any means of mechanically interconnecting the components.
H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05
Claims (6)
- 3. The structural member defined in claim 1 or claim 2 wherein the composite slab reinforcement is a flat sheet of steel mesh.
- 4. The structural member defined in any one of the preceding claims wherein the profiled decking sheet and the composite slab reinforcement are mechanically interconnected by welding and/or clinching. The structural member defined in any one of the preceding claims manufactured at a location remote from a building site and thereafter transported to the building site.
- 6. The structural member defined in any one of claims 1 to 5 manufactured at a building site.
- 7. A method of manufacturing the structural member defined in any one of the preceding claims that includes mechanically connecting together the profiled decking sheet and composite slab reinforcement prior to placing the profiled decking sheet in a required structural formwork position on a building site. H:\GRM\Keep\Speci\Bluescope\Structural formwork member Modification.doc 4/05/05 9
- 8. A structural member for a composite slab substantially as hereinbefore described with reference to the accompanying drawing.
- 9. A method of manufacturing a structural member for a composite slab substantially as hereinbefore described 00 with reference to the accompanying drawing. 0- 00 H:\GRM\Keep\Speci\Bluescope\Structura1 formwork member Modification.doc 4/05/05
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2005201878A AU2005201878A1 (en) | 2004-05-04 | 2005-05-04 | Structural members for composite slabs |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004902387A AU2004902387A0 (en) | 2004-05-04 | Structural members for composite slabs | |
| AU2004902387 | 2004-05-04 | ||
| AU2005201878A AU2005201878A1 (en) | 2004-05-04 | 2005-05-04 | Structural members for composite slabs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2005201878A1 true AU2005201878A1 (en) | 2005-11-24 |
Family
ID=35465387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2005201878A Abandoned AU2005201878A1 (en) | 2004-05-04 | 2005-05-04 | Structural members for composite slabs |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2005201878A1 (en) |
-
2005
- 2005-05-04 AU AU2005201878A patent/AU2005201878A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |