Precast concrete tilt-up construction: Specialized lifting hardware for tilt-up wall construction by which crane can lift reinforced concrete walls from horizontal casting position to vertical position in wall. Primary hardware is steel lifting stud/anchor/bolt/plug, attached to reinforcing steel or wire embedded in concrete, as shown in circled inset, as it looks after lift is completed and hardware has been released. This is lifted by ground release lifting hardware consisting of a clasp/lock/grip that fits over the lifting stud/anchor and grips it while the attached lifting eye/bale applies lift. The lifting clasp/lock/grip has a release arm by which an attached rope/chain/cable is pulled down by worker on ground to release the lifting hardware from the wall after lift has been completed. A lifting clevis (red here) provides attachment to crane cable by which wall is lifted. Photo shows lifting hardware in place on right, before ground man has activated its release arm by pulling on attached release chain. To left is lifting hardware after its release from lifting stud/anchor. Phoenix, Arizona, November 2006.
Tiltupconstructioncraneoperatorslabconcreteworkerprecastreinforcedbuildingliftinglifting hardwarestudanchorboltplugembeddedground releaseclasplockgripeyebaleclevisrelease armchaincablestructuretemporarysupportshorediagonalbracePhoenix2006
From Concrete Construction: reinforcing, forms, saw, shore, precast, erect