Proper Loading of Anchors - Slabs
When lifting small slabs, 3-point picks can ensure an even disbursement of the load to the anchors, when spaced about the center of gravity, at 120 spacing. The below images show some rigging layouts that will ensure applied loads are transferred equally to the lifting anchors. Lifting anchor locations are a percentage of element size to minimize flexural stresses, while maintaining minimum edge distance requirements per catalog design criteria.
4-point picks require some planning to ensure the load is evenly distributed to the lifting anchors. All three anchors receive equal loads if using three equally spaced lifters and rigging as shown. Fixed 4-point rigging should be avoided when possible. When using a fixed 4-point rigging, assume only 2 anchors will take the load.
3 anchors take the load
SPA 90 Mini spreader beam or rolling block.
.21W .58W W L .21L .58L .21W
4 anchors take the load Assume 2 anchors take the load
See rigging load charts for increased load factors.
See rigging load charts for increased load factors. This rigging does not equalize the load to all 4 anchors.
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