Designers Knowledge Base
In specifying the use of pre-cast concrete in his design the designer should be aware of, and assess the risks from, the following principal hazards.
Possible hazards and risks
- lifting and handling should be taken into consideration when specifying the shape, height and weight of the unit
- crushing caused by immaturity of concrete unit in lifting or by inadequate lifting points
- falling from height whilst accessing, locating, or fixing units
- collapse of pre-cast units may occur if not propped to carry the in-situ topping and temporary load or if it is unable to carry loading
Some design considerations
The specification of pre-cast concrete for use in a construction project requires the consideration of:
- a clear definition of the designer's preferred construction sequence to the principal contractor in the construction phase plan
- can the units be easily transported and lifted to their likely positions from the transporter to avoid double handling?
- specification of how the units are to be protected, handled, lifted and positioned and specify lifting points
- minimise and simplify locating and fixing procedures and details especially at height or depth
- detailing of reinforcement cages should identify lifting points