Cast-in lifting anchor
View Patent ↗An edge-lift anchor for tilt-up lifting of a concrete component has, at a lower part of its head an element for anchoring the head against shear forces acting during the tilt-up phase of lifting. Such element comprises an aperture to receive concrete, an aperture to receive a reinforcing bar, or a shear plate welded to the lower edge of the head.
1. An edge-lift anchor for embedment into a concrete component for tilt-up lifting, the anchor comprising:
a head for releasable engagement with lifting equipment, and
an anchoring portion comprising a leg extending from the head in a longitudinal direction of the anchor to lock the anchor into the surrounding concrete,
the head having opposite upper and lower parts adapted to be arranged in that order when the anchor is installed in the concrete component before lifting,
the head further having, within the lower part, an aperture to receive concrete which anchors the head against shear forces acting on the head during a tilt-up phase of lifting,
the lower part of the head having a downward extension, and
the upper part of the head having a recess for accommodating one or more perimeter bars for reinforcement of the concrete component, wherein the recess is of the same size and shape as said downward extension;
wherein said anchor further comprises, in order to increase shear resistance of the anchor, a shear plate welded to the lower part of the head.
2. An anchor according to claim 1 , wherein the anchoring portion comprises parallel legs profiled to lock into the surrounding concrete.
3. An anchor according to claim 1 , wherein a lower edge of the aperture is substantially straight and extends substantially parallel to the longitudinal direction of the anchor.
4. An anchor according to claim 1 , wherein the downwards extension contains at least a lower part of the aperture.
5. An anchor according to claim 1 , wherein the upper part of the head of the anchor further has an upward extension, and the lower part of the head has a further recess for accommodating a further perimeter bar for reinforcement of the concrete component, and the further recess is of the same size and shape as said upward extension.
6. An edge-lift anchor for embedment into a concrete component for tilt-up lifting, the anchor comprising:
a head for releasable engagement with lifting equipment, and
an anchoring portion comprising a leg extending from the head in a longitudinal direction of the anchor to lock the anchor into the surrounding concrete,
the head having opposite upper and lower parts adapted to be arranged in that order when the anchor is installed in the concrete component before lifting,
the head further having, within the lower part, an aperture to receive concrete which anchors the head against shear forces acting on the head during a tilt-up phase of lifting,
the lower part of the head having a downward extension, and
the upper part of the head having a recess for accommodating one or more perimeter bars for reinforcement of the concrete component, wherein the recess is of the same size and shape as said downward extension;
wherein said anchor further comprises, in order to increase shear resistance of the anchor, a shear plate welded to a lower edge of the downwards extension.
7. An edge-lift anchor for embedment into a concrete component for tilt-up lifting, the anchor comprising:
a head for releasable engagement with lifting equipment, and
an anchoring portion extending from the head in a longitudinal direction of the anchor to lock the anchor into the surrounding concrete,
the head having opposite upper and lower parts adapted to be arranged in that order when the anchor is installed in the concrete component before lifting,
the head further having, at a lower edge of the lower part, a shear plate extending transversely to the head to anchor the head against shear forces acting on the head during a tilt-up phase of lifting,
the lower part of the head having a downward extension, and
the upper part of the head having a recess for accommodating one or more perimeter bars for reinforcement of the concrete component, wherein the recess is of the same size and shape as said downward extension.
8. An anchor according to claim 7 , wherein the anchoring portion comprises parallel legs profiled to lock into the surrounding concrete.
9. An anchor according to claim 7 , wherein the shear plate is welded to the lower edge of the downward extension.
10. An anchor according to claim 7 , wherein the recess and the downward extension are all elongated in the longitudinal direction of the anchor.
11. An anchor according to claim 9 , wherein the upper part of the head of the anchor further has an upward extension, and the lower part of the head has a further recess for accommodating a further perimeter bar for reinforcement of the concrete component, and the further recess is of the same size and shape as said upward extension.
12. In combination, an edge-lift anchor embedded into a concrete component for tilt-up lifting, the anchor comprising:
a head for releasable engagement with lifting equipment, and
an anchoring portion extending from the head in a longitudinal direction of the anchor to lock the anchor into the surrounding concrete,
the head having opposite upper and lower parts adapted to be arranged in that order when the anchor is installed in the concrete component before lifting,
the lower part of the head having a downward extension, and
the upper part of the head having a recess accommodating one or more perimeter bars for reinforcement for the concrete component, wherein the recess is of the same size and shape as said downward extension.
13. A combination according to claim 12 , wherein
the head further has, at the lower part, an aperture receiving therethrough a length of bar which extends transversely to the anchor to anchor the head against shear forces acting on the head during a tilt-up phase of lifting.
14. A combination according to claim 13 , wherein the anchoring portion comprises parallel legs profiled to lock into the surrounding concrete.
15. A combination according to claim 13 , wherein the downwards extension contains at least a lower part of the aperture.
16. A combination according to claim 15 , wherein the upper part of the head of the anchor further has an upward extension, and the lower part of the head has a further recess for accommodating a further perimeter bar for reinforcement of the concrete component, and the further recess is of the same size and shape as said upward extension.
17. A combination according to claim 13 , wherein the recess and the downward extension are all elongated in the longitudinal direction of the anchor.
18. A combination according to claim 12 , wherein a length of the recess is sufficient to accommodate two or more such perimeter bars arranged side by side.
19. A combination according to claim 18 , wherein the length of the recess is sufficient to accommodate a degree of variation in the positioning of the perimeter bars within the recess.
20. A combination according to claim 12 , wherein the anchoring portion comprises parallel legs profiled to lock into the surrounding concrete.
21. A combination according to claim 12 , wherein the upper part of the head of the anchor further has an upward extension, and the lower part of the head has a further recess for accommodating a further perimeter bar for reinforcement of the concrete component, and the further recess is of the same size and shape as said upward extension.