AU2006209684A1 - A spacer for a cast-in ferrule - Google Patents
A spacer for a cast-in ferrule Download PDFInfo
- Publication number
- AU2006209684A1 AU2006209684A1 AU2006209684A AU2006209684A AU2006209684A1 AU 2006209684 A1 AU2006209684 A1 AU 2006209684A1 AU 2006209684 A AU2006209684 A AU 2006209684A AU 2006209684 A AU2006209684 A AU 2006209684A AU 2006209684 A1 AU2006209684 A1 AU 2006209684A1
- Authority
- AU
- Australia
- Prior art keywords
- spacer
- ferrule
- head portion
- concrete
- coupling
- 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
- 125000006850 spacer group Chemical group 0.000 title claims description 63
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000009415 formwork Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Landscapes
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Description
IO
00 O0 oo 0 Regulation 3.2
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
(ORIGINAL)
Name of Applicant: Address for Service: Invention Title: ITW Construction Products Australia Pty Ltd DAVIES COLLISON CAVE, Patent Attorneys, 1 Nicholson Street, Melbourne, Victoria 3000.
"A spacer for a cast-in ferrule" Details of Associated Provisional Application No: 2005905435 The following statement is a full description of this invention, including the best method of performing it known to us: Q \OPER\RSH\Iy 06 De 06\12831160-251 doc 8/9/06 P\OPERS?12831 160-CAPdc-OCdOg6
\O
-1- SA SPACER FOR A CAST-IN FERRULE 00 0 The present invention relates to a spacer for a ferrule to be incorporated into a concrete component at the time of casting.
00 In the production of concrete components such as panels or beams it is sometimes required to incorporate within the component at the time of casting an internally threaded ferrule to provide an embedded fixing point. A significant, but by no means exclusive, usage of such a fixing point is in a concrete wall panel for attachment of a temporary brace which retains the panel in an erected position prior to erection of other parts of the structure. Another usage may be to receive a threaded fastener or anchor for permanently coupling one component to another.
Cast-in ferrules are conventionally in the form of steel tube, typically of high strength steel, which is internally threaded at its outer end to receive a threaded anchor member (a bolt or a length of reinforcing bar, for example), and an anchoring foot at the opposite end.
The threaded end of the ferrule is intended to open onto an exposed face of the concrete component, and conventionally the open end of the ferrule lies very close to that face.
Depending on the type of component and where the ferrule is to be positioned in the component, the ferrule may either be positioned prior to casting or it may be manipulated into the component shortly after casting while the concrete is still wet, this being known as "puddling in".
The pull-out strength of a cast-in ferrule is dependent on its depth of embedment in the concrete, as determined by the distance between its anchoring foot and the face of the component onto which the ferrule opens. To provide increased depth of embedment for increased pull-out strength it has, in the past, been normal practice to provide longer ferrules. However, this results in increased material costs for the ferrule as well as requiring a supplier to stock each size of ferrule in a range of different lengths.
The invention is based on the appreciation by the inventor(s) that by using an appropriate P: OPER SHN128311 60-CAP doc.0A41 6
IND
\O
-2r, spacer a ferrule of a standard length can be given a greater depth of embedment to provide 00 increased pull-out strength without needing to increase the length of the ferrule itself.
0 ,According to the present invention there is provided a spacer for use in installing a cast-in 00 ferrule in a concrete component, the spacer comprising a head portion, and a spacer portion extending from the head portion and having, at an end remote from the head portion, a IDcoupling engageable with an outer end of the ferrule such that the spacer portion defines within the cast concrete a passage extending between an exterior face of the component and the ferrule, whereby after removal of the spacer an anchor member can extend through the passage into engagement with the ferrule.
Accordingly, for a given length of ferrule the use of the spacer enables an increased embedment depth and hence an increased pull-out strength to be achieved and which would otherwise require the use of a ferrule of increased length.
Advantageously the spacer portion is of frustoconical form tapering in a direction away from the head portion. The frustoconical passage thus formed in the concrete after removal of the spacer facilitates inflow and keying of concrete or other filler into the passage as may be required in most use situations either after removal of the anchor member if it is a temporary anchor, or around the shank of the anchor member if it is a permanent anchor. The frustoconical form of the spacer portion also facilitates its release from the concrete.
In one form, the coupling may be in the form of a an externally threaded boss engageable with an internal screw thread at the outer end of the ferrule. In another form the coupling has resilient lugs for snap-in engagement with an internal screw thread at the outer end of the ferrule, preferably over a range of thread diameters.
Advantageously the head portion is formed on an outer side thereof remote from the spacer portion with one or more keyways which facilitate the application of torque to the head portion to release the spacer from the ferrule. The head portion also preferably includes P: %OPERRSI-12831I 60-CAP do8)9A)6 -3zones of reduced thickness and identifiable from the underside of the head to receive nails 00 for nailing the head portion to formwork.
0 Embodiments of the invention will now be described by way of example only with 00 ID 5 reference to the accompanying drawings in which: Figure 1 is a perspective view of a spacer in accordance with one embodiment of IDthe invention; Figure 2 is a side view of a spacer; Figure 3 is an axial section through the spacer; Figure 4 is a view of a spacer from its underside; Figure 5 is a plan view of the spacer; Figure 6 is a perspective view of the spacer in longitudinal section; Figure 7 is a perspective view of an alternative embodiment of spacer having a coupling for use with a range of ferrule diameters; Figure 8 is a side view of the spacer of Figure 7; and Figure 9 is a section on line A-A of Figure 8.
A ferrule spacer in accordance with a first embodiment of the invention shown in Figures 1 to 6 consists of a head portion 2 of generally circular form and an integral generally frustoconical spacer portion 4 which extends from the head portion 2 and tapers in a direction away therefrom. At its remote end, the spacer portion 4 is formed with a coupling 6 for engagement with the internal thread of the ferrule. In the form shown, the coupling 6 is a threaded boss having a thread which matches that of the ferrule so that the threaded end of the ferrule can be screwed onto the boss to abut against the adjacent end of the spacer portion 4.
The spacer is formed as a thin-walled one-piece moulding in a suitable plastics such as nylon or polypropylene.
In use, the spacer may be attached to formwork prior to casting by nailing through the head portion 2 whereby the ferrule will be spaced from the formwork, and hence from the P: OPER\RS 1283I1160-CAP doc-O8M)9 -4exposed face of the concrete component, by a distance corresponding to the length of the 00 spacer portion 4. Alternatively the ferrule can be attached to the spacer and then "puddled 0 in" shortly after casting to a depth at which the underside of the head portion 2 is substantially flush with the exposed surface of the wet concrete.
00 IO At its upper or outer side the head portion 2 is dished and includes internal radial ribs ID(see Figure 5) extending between an outer rim of the head and an inner wall 12 extending around the outer end of the spacer portion. These ribs ensure that concrete entering the head portion 2 is divided into segments and will be easier subsequently to remove. The ribs 10 each include a slot 10a which forms a keyway engageable by a screwdriver or similar to facilitate application of torque such as by tapping the screwdriver with a hammer in order to rotate the head portion for release from the ferrule. The head portion 2 is also provided with a series of thin-walled zones defined by radial grooves 14 at its underside to receive nails for nailing the head to formwork when that type of installation is used. These grooves are angularly offset with respect to the ribs 10. The outer side of the head is also provided with flexible indicator lugs 16 to permit ease of identification of the placement of the spacer for subsequent removal after the concrete has set. The frustoconical form of the spacer portion 4 itself also facilitates removal of the spacer from the concrete component.
A cap 18 (see Figure 6) is applied to the outer end of the spacer portion 4 within the inner wall 12 in order to prevent flow of concrete into the interior of the spacer portion.
The use of the spacer enables the ferrule to be embedded at increased depth without the need to increase the length of the ferrule itself. When the spacer is removed after the concrete has set, the frustoconical spacer portion 4 will have formed a frustoconical passage leading from the exposed face of the component to the outer end of the ferrule for passage of an anchoring bolt or other threaded anchor member into engagement with the ferrule. The tapering frustoconical form of the passage assists the introduction of a concrete or cement filler into the passage after removal of the anchor member (if used just for the purpose of effecting a temporary connection), or around the shank of the anchor member (if used to effect permanent connection). It not only improves inflow of the filler P \OPERSH~12931I 16-CAP dO06.lU9) Sinto the passage but also improves the shear key between the filler and the wall of the 00 passage.
0 ,It will be understood that the use of the spacer not only enables increased depth of 00 NO 5 embedment without the need to increase the length of the ferrule, it also means that the outer end of the ferrule (its threaded end) is itself more deeply embedded within the NO concrete. In comparison with the normal situation in which the outer end of the ferrule is Svery close to the surface of the concrete, this increased depth of embedment at the outer end provides greater resistance to shear loads acting on the ferrule and tending to tilt the ferrule. Moreover the concrete or cement filler within the frustoconical passage after the anchoring bolt or similar has been engaged with the ferrule, increases the shear strength of the connection between the bolt and the ferrule.
The spacer can be manufactured relatively inexpensively by injection moulding and is capable of repeated use. In order to provide a range of embedment depths and hence pullout strengths for a ferrule of standard length, a range of spacers may be produced with spacer portions of different lengths.
The spacer described with reference to Figures 1 to 6 is designed for use with a specific internal diameter of ferrule as a result of the threaded boss at the end of the spacer portion.
An alternative embodiment shown in Figures 7 to 9 is designed for use with ferrules of a range of internal diameters.
In this embodiment, instead of a ferrule coupling 6 formed by a threaded boss which closes the inner end of the frustoconical spacer portion 4, the inner end is closed by a wall 4a which carries a coupling defined by a longitudinal web 30 which carries a pair of resilient lugs or wings 32 arranged in a V-shaped configuration with the apex defining the terminal end of the spacer. The outer edges of the two wings 32 remote from the apex are formed with outwardly flared lips 32a. The arrangement is such that when a ferrule is pushed over the coupling the wings 32 will be deflected inwardly by co-operation with the internal thread so that the lips 32a engage with the thread and the ferrule can then be rotated, P\OPERM AS 12831 (,-CAP docM4)RAN96 -6possibly through 1800, so that its outer end abuts against the end wall 4a in order to firmly 00 attach it to the spacer.
0 ,The embodiments have been described by way of example only and modifications are 00 N 5 possible within the scope of the invention.
IND Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
Claims (7)
1. A spacer for use in installing a cast-in ferrule in a concrete component, the spacer comprising a head portion, and a spacer portion extending from the head portion 00 -1 5 and having, at an end remote from the head portion, a coupling engageable with an outer end of the ferrule such that the spacer portion defines within the cast concrete 1,1 a passage extending between an exterior face of the component and the ferrule, whereby after removal of the spacer an anchor member can extend through the passage into engagement with the ferrule.
2. A spacer according to claim 1, wherein the spacer portion is of frustoconical form tapering in a direction away from the head portion.
3. A spacer according to claim 1 or claim 2, wherein the coupling is in the form of a an externally-threaded boss engageable with an internal screw thread at the outer end of the ferrule.
4. A spacer according to claim 1 or claim 2, wherein the coupling has resilient lugs for snap-in engagement with an internal screw thread at the outer end of the ferrule.
A spacer according to any one of claims 1 to 4, wherein the head portion is formed on an outer side thereof remote from the spacer portion with one or more keyways to facilitate the application of torque to the head portion to release the spacer from the ferrule.
6. A spacer according to any one of claims 1 to 5, wherein the head portion includes zones of reduced thickness and identifiable from the underside of the head to receive nails for nailing the head portion to formwork.
7. A spacer substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2006209684A AU2006209684A1 (en) | 2005-10-03 | 2006-09-08 | A spacer for a cast-in ferrule |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2005905435 | 2005-10-03 | ||
| AU2005905435A AU2005905435A0 (en) | 2005-10-03 | A spacer for a cast-in ferrule | |
| AU2006209684A AU2006209684A1 (en) | 2005-10-03 | 2006-09-08 | A spacer for a cast-in ferrule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2006209684A1 true AU2006209684A1 (en) | 2007-04-19 |
Family
ID=38009127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2006209684A Abandoned AU2006209684A1 (en) | 2005-10-03 | 2006-09-08 | A spacer for a cast-in ferrule |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2006209684A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2508693A3 (en) * | 2011-04-04 | 2013-12-04 | Peri GmbH | Fitting plug for fitting an anchor casing to a formwork |
| AU2015230702B2 (en) * | 2014-11-03 | 2020-09-17 | Nexus Construction Systems Pty Ltd | Support for pre-cast concrete slabs |
-
2006
- 2006-09-08 AU AU2006209684A patent/AU2006209684A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2508693A3 (en) * | 2011-04-04 | 2013-12-04 | Peri GmbH | Fitting plug for fitting an anchor casing to a formwork |
| AU2015230702B2 (en) * | 2014-11-03 | 2020-09-17 | Nexus Construction Systems Pty Ltd | Support for pre-cast concrete slabs |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK4 | Application lapsed section 142(2)(d) - no continuation fee paid for the application | ||
| PC1 | Assignment before grant (sect. 113) |
Owner name: ITW CONSTRUCTION PRODUCTS AUSTRALIA PTY LTD; ITW A Free format text: FORMER APPLICANT(S): ITW CONSTRUCTION PRODUCTS AUSTRALIA PTY LTD |
|
| TH | Corrigenda |
Free format text: IN VOL 26 , NO 41 , PAGE(S) 5316 UNDER THE HEADING ASSIGNMENTS BEFORE GRANT, SECTION 113 - 2006 UNDER THE NAME ITW CONSTRUCTION PRODUCTS AUSTRALIA PTY LTD AND ITW AUSTRALIA PTY LTD, APPLICATION NUMBER 2006209684, UNDER THE INID (21), CORRECT THE APPLICANT TO READ ITW AUSTRALIA PTY LTD. |