Panel Erection, Lifting Operations, and Bracing Installation
Erection is the highest-risk phase of tilt-up construction. Candidates must understand the sequence: lift planning, crane setup and verification, pick and set, temporary bracing installation, and release of the crane only after braces are secured. Key concepts include the erection drawing, panel identification, crane position and radius, tag line control, and the requirement that braces be installed and tensioned before the load is released.
Bracing installation includes brace angle, anchor engagement, and the sequence of installing braces on both faces as required. Panels must not be left unbraced, and braces must not be removed until permanent connections and the diaphragm are complete. Communication between the crane operator, rigger, and brace crew is critical, and the exclusion zone must be maintained throughout.
Traps: questions that allow the crane to release before bracing is complete; assuming one brace per panel is adequate; ignoring wind during erection; confusing the erection drawing with the structural drawings. Another trap is treating panel alignment adjustment as a post-brace activity rather than part of the set.
Rule of thumb: no crane release until the specified braces are installed, engaged, and checked - and never leave a panel standing on fewer braces than the erection plan requires, even overnight. Worked example: if the erection plan requires two braces per panel and one anchor fails during installation, the panel should be treated as unbraced and the crane held or the panel resecured per the engineer's direction, not left standing on a single brace.