AU2009238356B2 - A Box for Form Work - Google Patents
A Box for Form Work Download PDFInfo
- Publication number
- AU2009238356B2 AU2009238356B2 AU2009238356A AU2009238356A AU2009238356B2 AU 2009238356 B2 AU2009238356 B2 AU 2009238356B2 AU 2009238356 A AU2009238356 A AU 2009238356A AU 2009238356 A AU2009238356 A AU 2009238356A AU 2009238356 B2 AU2009238356 B2 AU 2009238356B2
- Authority
- AU
- Australia
- Prior art keywords
- box
- sheet
- perforations
- weakness
- sheets
- 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.)
- Ceased
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/125—Reinforcement continuity box
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
A formwork box has a back sheet 10 having an edge 11 and an opposite edge 12, lines of weakness in the form of perforations 13 define a perforated line 14 5 and a perforated line 15 along opposite sides of the sheet 10. The perforations define marginal edge regions 16 and 17. The perforations 13 are about 1mm wide, 25 mm long and separated by a gap of about 5 mm-10mm. The basic function of the perforations is to facilitate folding on-site with minimal tooling so that folding and assembly of the boxes is essentially by hand. This means that the sheets may be 1o transported as flat packs rather than have wasted space by transporting the finished boxes. _______ Jo ol 1 1 1k 0 I I J N N + I Pd Ia o. __ I _ I I I I I I I ol 1 1 I>? 1 1 _ N InN
Description
BOX FOR FORM WORK THIS INVENTION relates to form work employing tie bars installed in a box used to form a rebate in concrete structures.
In one aspect there is provided a method by which boxed tie bars are made from plural bent bars, a metallic back sheet and a metallic front sheet, the back sheet having a longitudinal axis and opposite longitudinal edges, each edge having a marginal edge region defined by longitudinally extending lines of weakness comprising spaced perforations, the back sheet having longitudinally spaced rebar entry/exit holes located just inboard of the perforations, the front sheet having a longitudinal axis and opposite longitudinal edges, the edges of the front sheet each having a marginal edge region defined by longitudinally extending lines of weakness, typically spaced perforations, the method comprising, folding by hand the front and back sheets about the lines of weakness to form folded sheets of U-shaped profile and having opposed flanges arising from the folding about the lines of weakness; inserting the bent rebars through the entry/exit holes in the back sheet; placing the front sheet over the rebars in the back sheet with the flanges of the sheets overlapping. In this configuration, the sheets form a box which has open ends and it is preferable that the ends be closed by inserting a closure into each end of the box. Typically, the closure at each end comprises a block of polystyrene. Of course extra lines of weakness could be formed in one or both sheets so that the ends are closed by extra flanges. Finally, it is preferable that the entire box be secured closed using some form of fastening. Typically, tape is employed so that the box may be opened to release the rebars.
In another aspect there is provided a box containing bent rebars with a portion of the rebars located inside the box and a portion located outside the box, the box being formed from hand-folded together metallic sheets closed at opposite ends, each sheet having longitudinal folds defined by longitudinally extending lines of weakness, typically, longitudinally extending perforations. Preferably, the portion of the rebars located outside the box is a loop and the portion located inside are terminal end sections of the bars that may be bent out after the loops are secured in concrete. In other words the back of the box is lost in concrete and upon removal of the front the bar ends are exposed and these may be manually bent out to a projected position for tying into a slab poured into the rebate.
In order that the present invention may be more readily understood and be put into practical effect reference will having made to the accompanying drawings which illustrate a preferred embodiment and wherein:-
Figure 1 is a plan view of a back sheet prior to folding;
Figure 2 is a plan view of a front sheet prior to folding;
Figure 3 is a drawing illustrating the front sheet being folded;
Figure 4 is a drawing illustrating the back sheet being folded and with the rebars located in position;
Figure 5 is a drawing illustrating the assembly of a box; and
Figure 6 shows a closed end of a box.
Referring to the drawings and initially to Figures 1 and 2 there is illustrated a back sheet 10 having an edge 11 and an opposite edge 12, lines of weakness in the form of perforations 13 define a perforated line 14 and a perforated line 15 along opposite sides of the sheet 10. The perforations define marginal edge regions 16 and 17. The perforations 13 are about 1mm wide, 25 mm long and separated by a gap of about 5 mm-10mm. The basic function of the perforations is to facilitate folding on-site with minimal tooling so that folding and assembly of the boxes is essentially by hand. This means that the sheets may be transported as flat packs rather than have wasted space by transporting the finished boxes.
The sheet material used in the front and back sheets is galvanized steel sheeting of about Ά mm thick so that the marginal regions 16 and 17 may be folded manually along the perforations lines to form flanges set at right angles to the plane of the sheet.
The back sheet 10 has spaced holes 18 set in pairs so that U-shaped rebars may be inserted through the holes. The back sheet is typically dimpled (not shown) in order to improve the adhesion of concrete to the back sheet. A front sheet 19 is about the same size as the back sheet and has similar perforations 13 so that marginal edge regions 20 and 21 may be folded into flanges, also manually.
Referring to Figure 3 the front sheet 19 is illustrated with its flanges 22 and 23 folded to form a U-shaped sheet. Likewise, Figure 4 shows the back sheet 10 with its flanges 24 and 25 folded in position to form a U-shaped sheet. Rebars 26 have been inserted through the holes 18 into the position shown in Figure 4. The rebars have their ends bent at about 90 degrees to the loop so that the ends locate inside the finished box with the loops protruding at about 90 degrees.
The rebars 26 have their free ends located inside the back sheet and wherein the back sheet and front sheet are inverted from the positions illustrated in Figure 3 and Figure 4, they may be assembled as shown in Figure 5 by placing the front sheet over the back sheet and closing the ends by inserting blocks 27 and 28 of polystyrene into the ends. Finally, tape is applied along the overlapping flanges and around the ends to close and seal the box. Once the box is installed in concrete the front remains accessible so that it may be removed to expose the ends of the rebars. A bar bending tool is then used to straighten the rebars which are then used as tie bars into the next slab.
Whilst the above has been given by way of illustrative example of the present invention many variations and modifications thereto will be apparent to those skilled in the art without departing from the broad ambit and scope of the invention as herein set out in the following claims.
Claims (3)
- THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:1. A method by which boxed tie bars are made from plural bent bars, a metallic back sheet and a metallic front sheet, the back sheet having a longitudinal axis and opposite longitudinal edges, each edge having a marginal edge region defined by longitudinally extending lines of weakness comprising spaced perforations, the back sheet having longitudinally spaced rebar entry/exit holes located just inboard of the perforations, the front sheet having a longitudinal axis and opposite longitudinal edges, the edges of the front sheet each having a marginal edge region defined by longitudinally extending lines of weakness comprising spaced perforations, the method comprising, folding by hand the front and back sheets about the lines of weakness to form folded sheets of U-shaped profile and having opposed flanges arising from the folding about the lines of weakness; inserting the bent rebars through the entry/exit holes in the back sheet; placing the front sheet over the rebars in the back sheet with the flanges of the sheets overlapping.
- 2. The method according to claim 1 wherein the sheets form a box which has open ends and the ends are closed by inserting a closure into each end of the box.
- 3. A box containing bent rebars with a portion of the rebars located inside the box and a portion located outside the box, the box being formed from hand-folded together metallic sheets closed at opposite ends, each sheet having longitudinal folds defined by longitudinally extending lines of weakness comprising longitudinally extending perforations.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2009238356A AU2009238356C1 (en) | 2008-11-21 | 2009-11-23 | A Box for Form Work |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2008906042A AU2008906042A0 (en) | 2008-11-21 | Box for form work | |
AU2008906042 | 2008-11-21 | ||
AU2009238356A AU2009238356C1 (en) | 2008-11-21 | 2009-11-23 | A Box for Form Work |
Publications (3)
Publication Number | Publication Date |
---|---|
AU2009238356A1 AU2009238356A1 (en) | 2010-06-10 |
AU2009238356B2 true AU2009238356B2 (en) | 2016-08-18 |
AU2009238356C1 AU2009238356C1 (en) | 2017-01-19 |
Family
ID=42261300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2009238356A Ceased AU2009238356C1 (en) | 2008-11-21 | 2009-11-23 | A Box for Form Work |
Country Status (1)
Country | Link |
---|---|
AU (1) | AU2009238356C1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0152015B1 (en) * | 1984-02-10 | 1989-12-20 | Josef Fuhs | Apparatus for flashing reinforcement steel |
DE3937275A1 (en) * | 1989-11-09 | 1991-05-16 | Halfeneisen Gmbh & Co | Support for concrete reinforcing rods - consists of sheet metal box with lid of impregnated wood fibres |
FR2660953A1 (en) * | 1990-04-13 | 1991-10-18 | Bernard Christian | Box for the stand-by positioning of reinforcements for connection between two parts of a concrete structure |
EP1067254B1 (en) * | 1999-07-08 | 2005-08-10 | Fimurex | Casing for reinforcement connection box and reinforcement connection box with such casing |
DE202007007583U1 (en) * | 2007-05-29 | 2007-08-02 | Syncotec Gmbh | Reinforcement access device e.g. for reinforcement access between waterproof walls, has wall having surface for delimitation of first concreting section and second wall surface for second concreting section |
-
2009
- 2009-11-23 AU AU2009238356A patent/AU2009238356C1/en not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0152015B1 (en) * | 1984-02-10 | 1989-12-20 | Josef Fuhs | Apparatus for flashing reinforcement steel |
DE3937275A1 (en) * | 1989-11-09 | 1991-05-16 | Halfeneisen Gmbh & Co | Support for concrete reinforcing rods - consists of sheet metal box with lid of impregnated wood fibres |
FR2660953A1 (en) * | 1990-04-13 | 1991-10-18 | Bernard Christian | Box for the stand-by positioning of reinforcements for connection between two parts of a concrete structure |
EP1067254B1 (en) * | 1999-07-08 | 2005-08-10 | Fimurex | Casing for reinforcement connection box and reinforcement connection box with such casing |
DE202007007583U1 (en) * | 2007-05-29 | 2007-08-02 | Syncotec Gmbh | Reinforcement access device e.g. for reinforcement access between waterproof walls, has wall having surface for delimitation of first concreting section and second wall surface for second concreting section |
Also Published As
Publication number | Publication date |
---|---|
AU2009238356C1 (en) | 2017-01-19 |
AU2009238356A1 (en) | 2010-06-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PC1 | Assignment before grant (sect. 113) |
Owner name: ILLINOIS TOOL WORKS INC. Free format text: FORMER APPLICANT(S): UNDERWOOD COMPANIES HOLDINGS PTY LTD |
|
DA2 | Applications for amendment section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 20 SEP 2016 |
|
DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 20 SEP 2016 |
|
FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |