ACI Tilt-Up Technician key terms

A building method in which concrete wall panels are cast horizontally on a flat slab near their final location, then lifted by crane into a vertical standing position and braced until permanent connections are complete.

The planning process of dividing a building's wall area into individual tilt-up panels, deciding each panel's size, shape, joint locations, and lifting points before any forms are built.

A flat, smooth, structurally adequate surface, often the building's own floor slab or a temporary pad, on which tilt-up panels are formed and cast.

A fixed reference point of known elevation or horizontal position, established by survey, from which panel layout, form setting, and final building elevations are measured.

A drawing showing the position, size, identification, joint locations, and openings for every tilt-up panel as it will be cast on the casting bed.

A drawing and site arrangement showing where cranes, delivery trucks, and lifting equipment travel and stand, including required ground bearing capacity and clearances for safe panel erection.

A unique code painted or marked on each panel, matching the erection drawings, so the correct panel is lifted, oriented, and set at the correct building location.

A material applied to the casting surface and forms so cured concrete does not bond to them, allowing the panel to be lifted cleanly with an undamaged face.

A temporary or permanent boundary, usually lumber or steel, placed around the panel perimeter to contain fresh concrete and shape the panel's edges and thickness.

A small angled or rounded strip fixed inside the edge form that produces a beveled or rounded corner on the finished panel, helping protect the edge from chipping.

A box, plug, or sleeve placed in the form to keep concrete out of an area, forming an opening or recess for doors, windows, penetrations, or hardware.

A shaped groove formed along a panel edge so grout or cast-in-place concrete at the joint creates an interlock that resists shear between adjacent panels.

A stiffening member, often a steel or concrete beam cast into or attached to a slender panel, added to control bending and cracking during lifting and handling.

Verifying that a panel form is rectangular by comparing its two diagonal measurements; equal diagonals confirm square ninety-degree corners before concrete is placed.

The thickness of concrete between the outer surface of embedded steel, such as rebar or mesh, and the nearest exposed concrete face; it protects the steel from corrosion.

A small support placed under reinforcement to hold bars or mesh at the specified height so the required concrete cover is maintained during placement and finishing.

Factory-welded sheets of crossing wires used as temperature or secondary reinforcement in panels, placed at the designed elevation with the specified lap width.

A device embedded in the panel at a designed location that connects to the crane's rigging and transfers the panel's weight into the concrete during the lift.

An embedded fitting, such as a coil or ferrule, placed in the panel face to receive the temporary bracing that holds the panel plumb after erection.

A steel plate cast into the panel surface, usually with welded studs or anchors, used to attach structural connections or welded hardware later.

A measure of fresh concrete consistency obtained with a slump cone; it indicates workability and, together with the mix design, helps control water content.

The process of removing trapped air from fresh concrete, usually with internal vibration, so the concrete fully surrounds reinforcement, inserts, and forms.

A straight edge or powered tool drawn across the top of freshly placed concrete to strike off excess material and bring the surface to the required elevation.

A large, flat hand tool on a long handle used to smooth and level the concrete surface and push coarse aggregate down immediately after screeding.

A surface texture produced by dragging a stiff-bristled broom across partially set concrete to create slip-resistant grooves, common on tilt-up panel faces.

A liquid applied to fresh concrete that forms a membrane slowing moisture loss, helping the concrete develop strength and reducing surface cracking.

Standard-sized concrete samples cast in molds from the placed mix and tested in compression to verify that the concrete meets the specified strength.

A crane manufacturer's table showing the maximum safe load for a given boom length, radius, and configuration; the operator must stay within its limits.

A multiplier that increases the tension in each sling leg as the angle between the leg and horizontal decreases, so steeper legs carry less load.

A rigid lifting beam that keeps sling legs vertical or nearly vertical and spreads the load across widely spaced lifting inserts to avoid overstressing the panel.

The point in a panel where its weight is balanced; rigging must be arranged so the panel hangs level and no insert or sling is overloaded.

A rope tied to a load and handled by a worker on the ground to control rotation and swinging while the crane moves the panel into position.

Adjustable struts connecting the standing panel to brace inserts and to ground or slab anchors, holding the panel plumb and resisting wind until permanent connections are made.

Systems such as guardrails, personal fall arrest, or work platforms used to prevent workers from falling while working at height on panels or structures.

A marked ground area beneath the lift where only the rigging crew may enter, keeping other workers clear of a falling panel or suspended load.

A visual and physical check of slings, shackles, hooks, and hardware for damage, wear, or missing tags before each lift, with defective items removed from service.

A written, engineered procedure for a lift that exceeds routine limits, such as unusually heavy panels or multi-crane picks, specifying equipment, sequence, personnel, and contingencies.