Heavy panels held up by temporary props — until they aren't connected, nothing is forgiving
Precast and tilt-up concrete panels are heavy, and until they are permanently connected they rely entirely on temporary propping and bracing. The failure of a single prop can let a panel fall and trigger a progressive collapse of the panels next to it. Safety has to be planned across the whole job — design, manufacture, lifting and erection — with engineered temporary support and the GRWM rules for raised and falling objects.
A precast or tilt-up panel weighs many tonnes. From the moment it leaves the casting bed until it is permanently fixed into the completed structure, it stands only because temporary props and braces hold it. WorkSafe's guidance on safe work with precast concrete makes the point plainly: the failure of a single prop supporting a panel can lead to a progressive collapse of the elements next to it.
The risks are not just at erection. They run through design, manufacture, transport, storage, handling and erection, and the businesses involved must consult, co-operate and co-ordinate. Designers contribute to a safe system of work for erection and to the design of safe temporary support. The GRWM Regulations set prescribed controls for work under raised or lifted objects and for objects that may fall from height — eliminate the risks, or minimise them so far as is reasonably practicable.
Propping and bracing should be designed by a competent person for the specific panels and site, accounting for wind, seismic and construction loads, and the props must be installed as designed. The base of each panel must be restrained against sliding, and where props are tied to an existing structure, that structure must be confirmed to have the strength to resist the loads. Don't remove or alter props until the panel is permanently and adequately connected. See temporary works.
Panels are lifted using cast-in anchors and inserts that must be rated for the load and rigging, and the concrete must reach a minimum strength before lifting. Plan the lift, use competent operators and riggers, keep people clear of the lift zone, and watch for overhead power lines. See crane & lifting operations and working at height for fixing connections.
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Because until they are permanently connected they rely entirely on temporary props and braces. The failure of a single prop can let a panel fall and trigger a progressive collapse of the panels next to it.
A competent person should design the temporary support for the specific panels and site, accounting for wind, seismic and construction loads, with the props then installed exactly as designed.
Not until the panel is permanently and adequately connected into the completed structure. Removing or altering props early is a common cause of collapse.
The General Risk and Workplace Management Regulations set prescribed controls for work under raised or lifted objects and for objects that may fall from height, requiring you to eliminate or minimise those risks so far as is reasonably practicable.
Rated lifting anchors and rigging, the minimum concrete strength reached, a lift plan, competent crane operators and riggers, exclusion of people from the lift zone, and awareness of overhead power lines.
