AU752353B2 - Lifting system - Google Patents

Lifting system Download PDF

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Publication number
AU752353B2
AU752353B2 AU27607/00A AU2760700A AU752353B2 AU 752353 B2 AU752353 B2 AU 752353B2 AU 27607/00 A AU27607/00 A AU 27607/00A AU 2760700 A AU2760700 A AU 2760700A AU 752353 B2 AU752353 B2 AU 752353B2
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AU
Australia
Prior art keywords
anchor
lifting
lifting anchor
reinforcement
legs
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AU2760700A (en
Inventor
Marco Giovanni Olivetti
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HILBERT SUPERANNUATION MANAGEMENT Pty Ltd
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ADNUNAT Pty Ltd
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Priority to AUPP9813A priority Critical patent/AUPP981399A0/en
Priority to AUPP9813 priority
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Assigned to HILBERT SUPERANNUATION MANAGEMENT PTY LTD reassignment HILBERT SUPERANNUATION MANAGEMENT PTY LTD Alteration of Name(s) in Register under S187 Assignors: ADNUNAT PTY. LTD.
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Description

P/00/011 Regulation 3.2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT o e Invention Title: Applicant: LIFTING SYSTEM W1 111111. V11 01A, T f The following statement is a full description of this invention, including the best method of performing it known to me: 1 LIFTING SYSTEM The present invention relates to lifting systems and, more particularly, to lifting anchors for permanent embedding in prefabricated concrete building components, such as concrete slabs and panels for wall elements.

In the construction industry, reinforced concrete building components are very often precast off site in a prefabrication factory and then transported to the construction site for installation. For the fabrication of a wall element, for example, consisting of a large reinforced concrete panel, a casting table is used for fabricating the element. The panel can then be removed after casting, for example by tilting the table to orientate the element in a vertical plane from where it can be readily hoist away. In order to allow safe and simple manipulation, lifting anchors are cast into the edge surface of the component, to which anchors hoisting shackles can be attached, and a crane or other lifting apparatus can then be used to manoeuvre and orientate the component. In a 0:**large reinforced concrete wall panel, two lifting anchors may be provided along each of two adjoining mutually perpendicular edges, the anchors embedded in recesses formed in the precast unit by way of rubber void formers, the head of each anchor being flush with or set below the wall edge to avoid projection of any part of it.

A typical lifting anchor comprises an elongate anchor body having an exposed end with a transverse aperture therethrough for passing the locking bolt of a hoisting shackle, an embedded intermediate portion serving as a first anchoring part, and an embedded end portion longitudinally split and bent into two oppositely angled legs serving as a second anchoring part.

The intermediate portion may feature one or two transverse apertures therethrough for passing reinforcement bars, and in addition or alternatively may include one or two edge recesses for engagement of reinforcing bars, particularly to assist in the transmission of the transversely directed forces between the lifting anchor and the body of the concrete panel component when the panel is tilted up from a horizontal position by edge hoisting applied to the lifting anchor.

Modern safety standards place strict demands on lifting anchors and their use.

To meet these requirements the anchors are fabricated from high grade steel of substantial thickness, contributing markedly to the cost of production. For example, standard 10T load-rated lifting anchors are made from 20mm thick high grade steel alloy.

oo.. 10 It is sometimes necessary in handling or installing a precast concrete panel to rotate the panel about an axis perpendicular to the plane of the panel. For example, a panel which has two long edges and two shorter edges may be transported in a vertical position orientated in a longitudinal direction (ie. resting on one of its long edges), but used in an upright orientation (ie. with its short faces upper and lowermost). Great care has to be taken when carrying out this rotation operation, as the lifting anchors are subject to substantially increased loads as the panel is rotated and the necessary rigging operation is performed.

For this reason, additional anchors may need to be provided in the precast panel, or anchors are used with a much greater load rating than would otherwise be necessary, thus adding considerably to the costs involved.

According to a first aspect of the invention, there is provided a lifting anchor for embedding in a concrete building component in such a way that an end thereof is left exposed for attachment of a hoisting shackle, said lifting anchor comprising a substantially planar elongate anchor body of which said exposed end has a transverse aperture therethrough sized and shaped for passing the locking bolt of the hoisting shackle, the elongate anchor body having an intermediate portion for embedding in the concrete building component to serve as a first anchoring part and an end portion for embedding in the concrete building component to serve as a second anchoring part, the intermediate portion having a transverse aperture therethrough adapted for passing a reinforcement bar, the end portion including two or more legs, and at least a part of the lateral edges of the legs having a meandering shaping to assist in 4 retention of the lifting anchor in the concrete building component, the legs being arranged to lie substantially in the plane of the anchor body when embedded.

The invention provides a simple inexpensive lifting anchor with an extremely high load rating, suitable for very wide application, including use in slim profile prefabricated concrete wall panels. Further advantages will become evident from the detailed description below of one embodiment of the invention.

Preferably, each leg has two lateral edges, both lateral edges presenting g 10 complementary meandering forms to provide a substantially constant width of material along the length of each leg. The meandering form may be a substantially smooth wavelike form or may be an angular form, such as a sawtoothed or castellated form featuring lateral projections from the legs.

In a preferred form, each leg has a substantially straight section interconnecting two mutually spaced sections whose lateral faces feature the said meandering shaping.

S* The intermediate portion of the lifting anchor may feature at least one lateral recess for use in locating one or more reinforcement shear bars during fabrication. Additionally, each exposed end may include at least one longitudinal extension of the elongate anchor body arranged to abut against a part of a hoisting shackle during tilt-up lifting operations.

If desired, more than one transverse aperture may be provided in said intermediate portion, each aperture adapted for passing therethrough a reinforcement bar.

In a particular form of the invention, the lifting anchor may have a thickness of about 16mm or less, load rated to about 9T or more.

The lifting anchor may be manufactured of galvanised high grade steel.

According to a second aspect of the invention, there is provided a method of embedding a lifting anchor as described above in a concrete building component, the method including the steps of: locating said lifting anchor in a prescribed position and orientation relative to a reinforcement system, the lifting anchor retaining a substantially planar form; passing a reinforcement bar through the aperture in said lifting anchor intermediate portion; and casting concrete around said reinforcement system to at least partially 10 embed said reinforcement system, said reinforcement bar and said lifting anchor.

To more clearly illustrate the invention, it will now be described by way of example with reference to the accompanying drawings, in which: **Fig. 1 shows a conventional lifting anchor for use in prefabricated reinforced concrete panel components; Fig. 2 shows a lifting anchor according to the invention; and Fig. 3 illustrates diagrammatically the use of the lifting anchor of Fig. 2.

The conventional lifting anchor for a concrete panel (not shown) in Fig. 1 is formed from an integral planar steel piece and consists essentially of an elongate anchor body 10 with an exposed end generally indicated at 11, exposed end 11 having a transverse aperture 12 punched therethrough and positioned, sized and shaped to accommodate a locking bolt of a hoisting shackle (not shown). Exposed end 11 has a bridge portion 13a flanked on either side of the anchor longitudinal axis by two integral projecting lugs 13b as shown which define inwardly directed load transmitting faces which serve to be engaged by a part of the hoisting shackle body when edge-hoisting the panel to tilt it from a horizontal position, in order to avoid pivoting of the shackle against the concrete itself and possible resulting damage thereto by concrete spalling.

Exposed end 11 connects with an embedded intermediate portion 14 of the anchor 10 which serves as a first anchoring part and is provided with one or more transverse apertures 15 punched therethrough for engagement therewith of reinforcing bars to assist in the retention of the anchor by distributing hoisting loads through the concrete panel by way of the reinforcement system. In addition, intermediate portion 14 is provided with two arcuate edge recesses 16 on opposite sides of the anchor longitudinal axis as shown. These recesses also serve to assist in transmitting hoisting loads, in particular those loads 10 transmitted when edge-hoisting the panel in tilt-up operation. To this end, bent reinforcing bars are engaged in one or both of the edge recesses 16 before casting.

Intermediate portion 14 further connects with an embedded end portion 17 which serves as a second anchoring part and comprises a longitudinal split **machined along the anchor longitudinal axis defining two anchoring legs 18 which are bent in opposite directions out of the plane of the anchor as shown.

The anchoring effect of intermediate portion 14 cooperating with reinforcing S* bars by way of apertures 15, in combination with that of anchoring legs 18, prevents pull-out of the lifting anchor from the concrete panel by providing a distribution of the loads within the panel generated during hoisting and handling operations.

Exposed end 11 is embedded inside the concrete of the edge of the panel so that it does not protrude beyond the outer surface thereof. For this purpose, end 11 is located within a rounded recess in the edge of the concrete panel, this recess being moulded during concrete casting by means of a rubber void former. The rounded recess allows access of the locking bolt of the hoisting shackle to transverse aperture 12, without coming into contact with the concrete sides of the recess. After placing of the concrete panel in situ the recess can be filled if desired to minimise exposure of the anchor to corrosion.

The lifting anchor 20 of the invention is shown in Figure 2 and is also formed from an integral planar steel piece. Parts of anchor 20 are designated by similar reference numbers to those parts described hereinbefore with reference to the conventional lifting anchor, but increased in each case by ten.

Anchor 20 includes an exposed end 21 of similar general form to the exposed end 11 of conventional anchor 10. Anchor 20 also includes an embedded intermediate portion 24 provided with at least one transverse aperture 25 and two arcuate edge recesses 26 as shown. Intermediate portion 24 connects 10 with an embedded end portion 27, intermediate portion 24 and end portion 27 serving as anchoring parts, and, as Figure 2 shows, end portion 27 has two anchoring legs 28, both in the plane of the lifting anchor. Legs 28 are machined with a generally meandering form, at least for a part of their length, giving anchor 20 an overall "hairpin" form. In the embodiment illustrated each leg includes a first meandering length 28a adjacent to the tips of the legs and a second meandering length 28b adjacent to embedded intermediate portion 24, between which first and second meandering lengths 28b each leg features a straight length 29. Legs 28 are both unbent in fabrication and employment, unlike legs 18 of the conventional lifting anchor.

Through tests carried out by the inventor, it has been discovered that the lifting anchor of the invention provides a number of substantial and surprising advantages over the conventional anchor. In particular, the combination anchoring effect of the intermediate portion 24 cooperating with reinforcing bars by way of apertures 25, and that of shaped legs 28 embedded in the concrete panel, provide a very high resistance to pull-out and a very high load distribution without the need to bend the anchoring leg portions out of the plane of the anchor. Avoiding the necessity of bending the leg portions offers a number of distinct advantages to the design of the invention: 1. In production, a bending operation is not required after the machining, punching and associated processing of the anchor plate, so saving on fabrication time and costs.

2. The planar form of the lifting anchor affords very space-efficient packing for distribution to the prefabrication factory, unlike the conventional bent-leg form, which presents considerably difficulty in bulk packing.

3. The planar form of the anchor allows its utilisation in slimmer concrete panels than the conventional bent-leg form will afford, while retaining the necessary concrete coverage.

o 10 The tests referred to above were carried out using an anchor according to the invention having a thickness of 16mm, an overall length of 136.5mm, and a 00: width (across the opposite outer flat side faces of the exposed end 21) of The results, surprisingly, demonstrated that, including a required safety factor, the anchor had a lifting capacity of 9T, only slightly lower than a conventional lifting anchor load-rated to 10T having a thickness of 20mm. The S:e anchor tested therefore involved the consumption of less than half of the material required by the conventional anchor, and this despite the absence of the bent leg portions, hitherto believed to be essential for lifting anchors of this load rating.

A general "hairpin" form lifting anchor has been employed before in incorporation in prefabricated concrete panels, but only for low working loads.

For example, 2 T and 5T rudimentary "hairpin" form anchors are known of, respectively, 10mm and 16mm steel thickness, but it has conventionally been accepted that such anchors are only appropriate for such relatively low loads and accordingly have never been proposed with transverse apertures for cooperation with reinforcement bars. Remarkably, the anchor of the invention involves a consumption of material similar to that of a rudimentary "hairpin" form lifting anchor.

A particular advantage provided by the invention in the specific embodiment described above is that the anchor can be used in place of both the conventional 5T anchor and the 10OT anchor. In the case of the replacement of 9 the conventional 5T anchor, the anchor of the invention accommodates the considerably increased forces mentioned earlier in this specification which are generated when a concrete panel is rotated about an axis perpendicular to its plane, without the need for.additional safety anchors, and with a negligible increase in material used and therefore cost.

The straight lengths 29 of legs 28 have been found to increase the overall strength of the leg portions whilst reducing machining costs, when compared with eg portions of meandering form along their entire length, but without oooo 10 reducing the anchoring performance of the anchor in the concrete.

ooeo .:The manufacture of the lifting anchor of the invention involves firstly the cutting of the anchors from high grade steel stock, in this case Grade 350 carbon steel, by a computerised profile cutter. The anchor shape illustrated in Figure 2 affords minimum material wastage, as the steel stock left once legs 28 of a first anchor have been cut out (ie, the intervening gap in Figure 2) provides the material for one leg of each of two further anchors, cut with their exposed ends V006 facing away from that of said first anchor. Such a cutting pattern reduces steel 0 0* waste to an absolute minimum.

The next stage is the cleaning of the cut anchors to remove burr and any other major imperfections. This is followed by the punching of hoisting shackle aperture 22 and reinforcing bar aperture 25. To speed the manufacturing process, aperture 25 may be cut as part of the profile cutting process, slit (Figure 2) showing the path taken by the profile cutter from the end surface of the gap between legs 28 to aperture 25. If required in certain conditions of use, lifting anchor 20 may then be galvanised, or otherwise dipped, spray-coated or further processed, to provide resistance to corrosion.

Figure 3 illustrates the use of the lifting anchor 20, the bars of the reinforcing mesh diagrammatically shown at 33. Anchor 20 is placed over the reinforcing mesh such that the boundary bar 30 abuts the end surface of the gap between legs 28, as shown. Anchor reinforcing bar 31 is passed through aperture and, if the concrete panel is intended to be lifted for tilting-up about an edge, an additional shaped shear bar 32 is placed over lifting anchor 20 and located in edge recess 26. An oil resistant flexible rubber void former (not shown) is placed over exposed end 21, also assisting in holding the anchor firmly in place during the subsequence casting. Broken line 34 represents the surface of the concrete recess thus formed against the face of the lifting anchor, the recess defining the space into which the hoisting shackle head will fit.

As an alternative, and to provide a yet stronger anchoring arrangement, anchor 10 reinforcing bar 31 may be omitted and instead boundary bar 30 can be passed through aperture 25 before bars 33 of the reinforcing mesh are tied to it. In this way, anchor 20 effectively becomes an integral part of the concrete panel reinforcement system.

S

S.o.

It should be understood that the above disclosure describes only preferred embodiments of the invention, and that various modifications, alterations and/or additions may be made thereto without departing from the spirit and scope of the invention.

S

Claims (9)

1. A lifting anchor for embedding in a concrete building component in such a way that an end thereof is left exposed for attachment of a hoisting shackle, said lifting anchor comprising a substantially planar elongate anchor body of which said exposed end has a transverse aperture therethrough sized and shaped for passing the locking bolt of the hoisting shackle, the elongate anchor body having an intermediate portion for embedding in the concrete building 0.. 9 component to serve as a first anchoring part and an end portion for embedding .o 10 in the concrete building component to serve as a second anchoring part, the intermediate portion having a transverse aperture therethrough adapted for passing a reinforcement bar, the end portion including two or more legs, and at least a part of the lateral edges of the legs having a meandering shaping to *o assist in retention of the lifting anchor in the concrete building component, the legs being arranged to lie substantially in the plane of the anchor body when embedded. lilt
2. A lifting anchor according to claim 1, wherein each leg has two lateral edges, both lateral edges presenting complementary meandering forms to provide a substantially constant width of material along the length of each leg.
3. A lifting anchor according to any preceding claim, the meandering form being a substantially smooth wavelike form.
4. A lifting anchor according to claim 1 or claim 2, the meandering form being an angular form, such as a saw-toothed or castellated form with lateral projections from the legs. A lifting anchor according to any preceding claim, each leg having a substantially straight section interconnecting two mutually spaced sections whose lateral faces feature the said meandering shaping. 12
6. A lifting anchor according to any preceding claim, the intermediate portion of the lifting anchor featuring at least one lateral recess for use in locating one or more reinforcement shear bars during fabrication.
7. A lifting anchor according to any preceding claim, wherein, each exposed end includes at least one longitudinal extension of the elongate anchor body arranged to abut against a part of a hoisting shackle during tilt-up lifting operations.
8. A lifting anchor according to any preceding claim, wherein more than one transverse aperture is provided in said intermediate portion, each aperture adapted for passing therethrough a reinforcement bar.
9. A lifting anchor according to any preceding claim, the lifting anchor has a thickness of about 16mm or less, load rated to about 9T or more. 06€ 8040 A method of embedding the lifting anchor of any preceding claim in a concrete building component, the method including the steps of: loci•• locating said lifting anchor in a prescribed position and orientation relative to a reinforcement system, the lifting anchor retaining a substantially planar form; passing a reinforcement bar through the aperture in said lifting anchor intermediate portion; and casting concrete around said reinforcement system to at least partially embed said reinforcement system, said reinforcement bar and said lifting anchor.
11. A lifting anchor, substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings. DATED: 7 April, 2000 PHILLIPS ORMONDE FITZPATRICK SAttorneys for: a tor more, A. OLIVETTI ENGINEERING PTY LTD
AU27607/00A 1999-04-20 2000-04-07 Lifting system Expired AU752353B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AUPP9813A AUPP981399A0 (en) 1999-04-20 1999-04-20 Lifting system
AUPP9813 1999-04-20
AU27607/00A AU752353B2 (en) 1999-04-20 2000-04-07 Lifting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU27607/00A AU752353B2 (en) 1999-04-20 2000-04-07 Lifting system

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AU2760700A AU2760700A (en) 2000-10-26
AU752353B2 true AU752353B2 (en) 2002-09-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008078008A1 (en) * 2006-12-22 2008-07-03 Marcel Arteon Anchor for handling building elements, in particular a concrete panel
AU2004200854B2 (en) * 2003-04-14 2010-05-13 Cetram Pty Limited Lifting anchors
WO2011006188A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
WO2011006187A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
WO2011006189A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
WO2013163395A1 (en) * 2012-04-26 2013-10-31 Illinois Tool Works Inc. Lifting anchors

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007202357B8 (en) 2006-06-28 2013-12-19 Illinois Tool Works Inc. Cast-in lifting anchor
EP2088112A1 (en) 2008-02-08 2009-08-12 Marcel Arteon Anchor for supporting construction elements on supported diverging branches

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500029A2 (en) * 1991-02-21 1992-08-26 Siegfried Fricker Flat steel concrete anchor for precast concrete parts
NZ333138A (en) * 1998-12-01 1999-01-28 Ramset Fasteners Aust Pty Ltd A lifting anchor of the type to be incorporated into a concrete component prior to casting by which the component can be lifted during subsequent erection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500029A2 (en) * 1991-02-21 1992-08-26 Siegfried Fricker Flat steel concrete anchor for precast concrete parts
NZ333138A (en) * 1998-12-01 1999-01-28 Ramset Fasteners Aust Pty Ltd A lifting anchor of the type to be incorporated into a concrete component prior to casting by which the component can be lifted during subsequent erection

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2004200854B2 (en) * 2003-04-14 2010-05-13 Cetram Pty Limited Lifting anchors
WO2008078008A1 (en) * 2006-12-22 2008-07-03 Marcel Arteon Anchor for handling building elements, in particular a concrete panel
WO2011006188A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
WO2011006187A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
WO2011006189A1 (en) * 2009-07-17 2011-01-20 Casne Verige Pty Ltd Concrete lifting anchors
EP2588680A1 (en) * 2009-07-17 2013-05-08 Casne Verige Pty Ltd Concrete lifting anchors
EP2588680A4 (en) * 2009-07-17 2014-04-09 Casne Verige Pty Ltd Concrete lifting anchors
WO2013163395A1 (en) * 2012-04-26 2013-10-31 Illinois Tool Works Inc. Lifting anchors
AU2013203970B2 (en) * 2012-04-26 2015-06-04 Illinois Tool Works Inc. Lifting anchors
US10626626B2 (en) 2012-04-26 2020-04-21 Illinois Tool Works Inc. Lifting anchors

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