Lifting anchors play a critical role in the safe handling and installation of precast concrete products. From factory demolding to on-site erection, correctly using lifting anchors ensures structural integrity, worker safety, and efficient workflow. This guide explains how lifting anchors work, how to use them correctly, and what precautions must be taken throughout the lifting process.
What Are Lifting Anchors?
Lifting anchors are embedded inserts cast into precast concrete elements during production. They are specifically engineered to handle dynamic lifting loads, including vertical lifting, angled lifting, tilting, and rotation.
Unlike ordinary concrete anchors, lifting anchors are only used temporarily during handling and transportation, and are never intended for permanent structural fixing.
Typical precast products lifted using lifting anchors include:
Wall panels
Beams and columns
Floor slabs
Stairs and balconies
Utility boxes and manholes
How to Use Lifting Anchors
Using lifting anchors correctly is essential for safe, efficient handling of precast concrete products. Compared with improvised lifting methods, a well-planned lifting anchor system delivers better load control, fewer surface defects, and higher overall site safety. Below is a clear, step-by-step guide covering best practices from selection to release.
Select the Correct Lifting Anchor
Choose the anchor type based on the precast element (wall panel, beam, slab, stair) and the lifting method required.
Check the rated load, lifting angle, and number of lifting points. Always include an appropriate safety margin rather than selecting the minimum capacity.
Match the anchor to the concrete strength and thickness to avoid pull-out or edge damage.
Position the Lifting Anchor During Casting
Place anchors exactly according to the lifting design to maintain balance and proper load distribution.
Secure anchors firmly during casting to prevent movement during vibration. Accurate positioning at this stage avoids uneven stress and cracking later.
Allow Concrete to Reach Required Strength
Never lift precast elements before the concrete reaches the specified lifting strength.
Early lifting may appear successful but can cause internal cracks that reduce long-term durability.
Attach the Correct Lifting Clutch
Use only lifting clutches designed for the specific anchor type and size.
Inspect the clutch for wear and ensure it is fully engaged and locked before lifting.
Perform a Controlled Lift
Lift slowly and smoothly to avoid shock loads.
Keep lifting lines aligned and perform a brief test lift to confirm stability before raising the element fully.
Lower and Release Safely
Lower the precast element onto stable supports and remove tension gradually.
Release the clutch only when the load is fully supported, then inspect the hardware for reuse.
Safety Guidelines for Using Lifting Anchors
Safe lifting is not just a best practice in precast concrete production—it is a requirement. Lifting anchors are safety-critical components, and following proper guidelines helps protect workers, equipment, and the precast elements themselves. The points below outline the key principles every lifting operation should follow.
Never exceed the anchor’s rated load
Each lifting anchor is engineered with a specific load capacity based on concrete strength, embedment depth, and lifting direction. Exceeding this limit can lead to anchor failure or concrete breakout. Always verify the anchor rating against the actual weight of the precast element.
Do not lift beyond the designed angle limits
Lifting anchors are tested for defined lifting angles. Exceeding these limits increases stress on the anchor and surrounding concrete, significantly reducing safety margins.
Use only certified anchors and matching clutches
Certified lifting anchors and compatible lifting clutches are designed as a system. Using uncertified or mismatched equipment compromises load transfer and increases risk.
Keep personnel clear of suspended loads
No worker should stand under or near a suspended precast element. Clear lifting zones reduce the risk of injury in case of unexpected movement.
Inspect anchors and lifting equipment regularly
Routine inspection helps detect wear, deformation, or corrosion early, ensuring every lift remains safe and controlled.
Conclusion
The correct use of lifting anchors is crucial for the safe and efficient handling of precast concrete products. By selecting appropriate anchors, accurately positioning them during pouring, ensuring sufficient curing time, and following proper lifting procedures, manufacturers and contractors can minimize risks and maximize productivity.
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