201 Panel Lift, Set, and Brace Workflow¶
Warning
Crane stations and the slab edge — read this before copying any station shown here.
A crane station must sit entirely outside the wall-clearance standoff, on prepared subgrade, or entirely inboard of the closure strip, on the poured slab. Never between the two, and never spanning the boundary. The test is the machine’s bearing footprint — its tracks or outriggers — not the centre of a drawn circle. One track on poured slab and one on unpoured subgrade gives differential support under the mat; the slab edge spalls or the subgrade settles, and the machine goes out of level under load.
TCA Safety Guideline v13.1 (June 2013) §2 item 6, p.8: “Install entrance and exit ramps for the crane to position itself onto the floor slab. Do not allow the crane to exert its weight on the extreme edge of any portion of the slab.” See also OSHA 29 CFR 1926.1402 — ground conditions; the operator must be notified of bearing capacity, and the controlling entity is responsible for adequate site preparation.
Station placement in this release is a known open defect (CV-2714). The perpendicular standoff is a fixed value that every catalogued machine’s bearing footprint exceeds, so a generated station can straddle the boundary. Do not copy a station position from this lesson, or from its video, onto a real site. Have the setup reviewed against the machine’s bearing footprint and the site’s own closure-strip and brace-line dimensions.
And on this release the drawn frame can be mirrored, which makes an inside/outside verdict untrustworthy whenever it happens. It was measured in coordinates on a saved post-draw drawing rather than inferred: after Site Drawing Options is entered twice, wall-line ends land at the exact Y-mirror of their shipped positions – same X to the hundredth, Y negated – 622 feet apart at the widest, while a point at the origin separates by zero, which is what distinguishes a mirror from a constant shift. Two points were left unmoved, so this is a partial redraw and not a blanket transform of every coordinate. The no-flip control has since been run, and the frame flip IS the cause. An otherwise identical take with no Site Drawing Options entries drew ZERO mirrored points, with all four shipped points unchanged, while the flipped take mirrored two of them. The control was not a null run – it drew ten points against the shipped four, and left fourteen wall-line ends open against the shipped two – so the zero means something. The mirror is therefore not present on an untouched drawing – but the action that brings it on is smaller than it sounds: opening Site Drawing Options twice and then drawing is enough. Measured on the dialog itself, BOTH openings were closed with Esc – no OK, no edit, nothing typed. Backing out of the dialog still sets it. That is still ordinary use and still a defect, but it is narrower than the previous wording implied. The discriminator is clean and the sample is small – four shipped points, on staged copies rather than customer files. An earlier version of this note said the draw refused and therefore nothing reached the sheet; part of it drew, and what drew is mirrored.) So a station reported as clear of the closure strip may not be. Treat every crane position here as illustrative of the workflow only, never as a sited answer.
Scope, measured 2026-09-16: this page carries no station imagery, so the caution is about the workflow it describes rather than about anything depicted here.
This 201 guide expands the 101 overview in Lifting, Rigging, and Bracing with execution workflow from cast bed to footing line and temporary bracing.
1. Purpose¶
Provide a practical process flow for panel pickup, rotation, set, plumbing, and temporary stabilization.
2. Inputs¶
Construction sequence and panel release order
Crane station plan and rigging profile map
Brace insert map and floor anchor method
Wind limits and weather hold criteria
3. Outputs¶
Step-by-step construction sequence package
Panel-level set and brace checklist
Hold-point log and sign-off points
4. Workflow Stages¶
Pre-lift readiness
Pick and initial rotation
Transit to set line
Set on footing/grade beam
Temporary brace connect and tension
Plumb verification and release
Post-set inspection and handoff
5. Pre-Lift Checklist¶
Concrete strength at lift verified (ACI 551.1R §6; minimum typically 3,000 psi but engineer-specified based on insert capacity and panel weight)
Hardware inspection complete
Exclusion zones established
Communications protocol active
6. Set and Brace Checklist¶
Bearing location confirmed
Brace count and spacing within plan (ACI 551.1R §7; TCA Recommended Practices)
Brace angles in allowable range
Floor anchors installed per method
Plumb tolerance verified (ACI 117; accepted deviation as specified by engineer or project specification; ACI 551.1R §7 defers to ACI 117 for erected panel tolerances)
7. Corner and Interference Management¶
Define standard response for:
Inside-corner brace crossing
Adjacent panel brace conflicts
Sequencing changes due to crane access
8. Weather and Stop Criteria¶
Set stop-work triggers for:
Wind threshold exceedance (thresholds from brace manufacturer engineering bulletins and the engineer-of-record; no single federal wind-speed threshold governs — engineer-specified for each project)
Visibility and communication loss
Hardware or anchor anomalies
Construction sequence non-conformance (OSHA 29 CFR 1926.703(d): deviations from the PE-approved construction procedure require re-approval before lifting resumes)
9. Interior vs Exterior Bracing Strategy¶
Default practice in tilt-up is interior-face bracing from the casting slab side. Outside bracing is project-specific and should be treated as an exception plan that is explicitly engineered and documented.
9.1 Interior Bracing (Default)¶
Use when interior brace lanes and floor-anchor access are available
Coordinate brace anchors with slab joints, penetrations, and MEP trenches
Verify brace travel lanes are protected from crane and delivery traffic
9.2 Exterior Bracing (Exception)¶
Use when interior access is blocked, interior slab work must proceed immediately, or slab does not yet exist
Pre-plan insert method (cast pocket, weld plate, or post-installed anchor)
Require explicit construction note for exterior access equipment and inspection method
Exterior bracing must still satisfy ACI 551.1R temporary stability requirements and ACI 318 Ch. 17 anchor checks at both panel and floor/support connection points.
10. Forming and Casting-Bed Layout Controls¶
Lift planning and sequence quality are strongly affected by panel bed arrangement and forming order. Include these controls in pre-pour planning:
Panel bed map with panel marks, pick orientation, and planned rotation direction
Pick insert and brace insert coordinates locked before reinforcing congestion zones are tied
Casting slab pocket details identified where bottom-face/exterior inserts are required
Bond-breaker, edge form, and reveal details checked so inserts and hardware remain accessible at pick day
Sequence map showing first-lift, blocker panels, and crane lane preservation
If panel arrangement or formwork revisions change rotation path, pick-side demand, or crane access, lift and brace checks must be reissued before construction continues.
11. Standards References¶
ACI 551.1R §6 — Minimum concrete strength at lift, pick sequence, and panel rotation safety
ACI 551.1R §7 — Brace count, brace spacing, brace angles, and temporary stability requirements
ACI 117 — Construction tolerances; plumb acceptance criteria for erected panels; current edition governs
OSHA 29 CFR 1926.703(d) — Tilt-up construction procedure must be prepared by a registered professional engineer
TCA Recommended Practices — Field checklists, brace connect sequence, plumb and release criteria
ASME B30.9 — Slings; angle reduction, capacity, and inspection requirements during panel pick
12. TODO Project Fill-In¶
Add panel-by-panel checklist template
Add field sign-off form and roles
Add standard hold-point status labels