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Concrete Lifting Anchor

a technology of lifting anchors and concrete, which is applied in the field of concrete lifting anchors, can solve the problems of mechanical interlocking between the anchors, concrete may crack or even fail completely, and the welding is often not desirable,

Inactive Publication Date: 2008-08-21
WOODSTOCK PERCUSSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The genesis of the present invention is a desire to provide

Problems solved by technology

If the magnitude of the forces transferred to the concrete exceeds the strength of the concrete at the location of the anchor then the concrete may crack or even fail completely.
Firstly, the anchor is provided with features which result in a mechanical interlock between the anchor and the surrounding concrete.
Secondly, the anchor is mechanically connected to a deeply embedded reinforcing element, eg a “hanger bar” which distributes the load over a large volume of concrete.
Welding is often not desirable because reinforcing steels may not be suitable for welding and may also be substantially weakened at the site of the weld or attempted weld.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0080]Turning now to the present invention illustrated in FIG. 18, if the upper body section of a hairpin anchor is sufficient to resist bending, then the load may be transferred through the anchor body to the lower leg of the anchor. The inside surfaces of the lower leg transfers the shear forces into the concrete below the centre of lift in a similar way to the method described in FIG. 17 but without the requirement for a separate lateral projection 52. The critical embedment depth to resist shear is therefore the distance between the upper surface of the concrete and the inside lateral edge of the lower hairpin leg.

[0081]A limitation of this type of anchor is determined by the geometry of the anchor with respect to the surface of the concrete. The minimum distance “concrete cover” between the surface of the outside lateral edge of the leg of the anchor and the concrete surface is fixed by serviceability requirements of construction standards.

[0082]The width of the hairpin leg is ...

second embodiment

[0084]In the second embodiment illustrated in FIG. 19, the aperture 63 has the two lobes 163 and 263 offset relative to the longitudinal axis of the anchor 61.

[0085]It will be apparent to those skilled in the art that the general arrangement of the anchor 61 of FIGS. 18 and 19 has the following desirable features:

[0086](a) a means of providing a centre of lift which is aligned with the centre of mass of the panel,

[0087](b) the distance between the upper surface of the anchor body and the upper free surface of the panel being a maximum to minimise cracking above the anchor toward the concrete surface,

[0088](c) the embedment depth from the inside (upper) surface of its lower leg to the concrete surface being a maximum,

[0089](d) respect for the requirements for concrete cover, and

[0090](e) simplicity and cost of manufacture.

[0091]The anchor 61 avoids the limitations of prior art edge lift anchors and provides a universal anchor for lifting in tension and shear from anchors placed in th...

ninth embodiment

[0098]Furthermore, in plan views FIGS. 26-34, eight different embodiments are illustrated each with a differently shaped aperture 63, and a ninth embodiment is illustrated with flared or inclined legs 34.

[0099]In four additional edge elevations, as seen in FIGS. 35-38, four different versions of the legs are illustrated, each of which is applicable to each of the embodiments illustrated in FIGS. 23-25 and 35-38.

[0100]FIGS. 39-45 illustrate a still further nine embodiments, each of a hairpin anchor of the type illustrated in FIG. 23 but in which the mechanical interlock with the concrete is formed by one of the corresponding seven plates illustrated.

[0101]FIGS. 46-54 illustrate a still further nine embodiments, each of a hairpin anchor of the type illustrated in FIG. 18 with variations of the aperture 63, notches 17 and additional aperture 64.

[0102]The above embodiments are summarised as follows:

[0103]FIG. 23 is a solid bodied, planar anchor with penetrations,

[0104]FIG. 24 is similar...

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Abstract

An elongate substantially planar lifting anchor (61, 161, 261, 361) to be embedded in concrete panels (2) and the like is disclosed. The anchor (61, 161, 261, 361) has a through aperture (63) adjacent one end (65) and the other end (34) is adapted to form a mechanical interlocking anchor with the concrete of the panel (2) in which the other end (34) is embedded, wherein the through aperture (63) is shaped to simultaneously receive both a lifting shackle (28) and a reinforcing member (263). The concrete panel incorporates at least one of the abovementioned elongate substantially planar lifting anchors (61, 161, 261, 361) and a method of lifting a concrete panel (2) in which a lifting anchor has been embedded comprises the steps of:(i) passing the lifting anchor (61, 161, 261, 361) through the aperture (63), and(ii) lifting the shackle (28) to transfer load directly to the reinforcing member (263) and thereby raise the panel (2).

Description

FIELD OF THE INVENTION[0001]The present invention relates to concrete lifting anchors. Lifting anchors to be embedded in a concrete element are known to enable the concrete element to be safely lifted and manoeuvred without damage. In order for concrete elements to be safely lifted using anchors located therein the tensile and shearing forces generated in the anchors by the application of the lifting force need to be transferred to the surrounding concrete without either failure of the anchor or of the concrete element.BACKGROUND OF THE INVENTION[0002]If the magnitude of the forces transferred to the concrete exceeds the strength of the concrete at the location of the anchor then the concrete may crack or even fail completely.[0003]There are three basic techniques for transferring the loads to the concrete. Firstly, the anchor is provided with features which result in a mechanical interlock between the anchor and the surrounding concrete. The interlock may be achieved by a substanti...

Claims

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Application Information

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IPC IPC(8): E04G21/14
CPCE04G21/142
Inventor MACKAY SIM, ROD
Owner WOODSTOCK PERCUSSION