Magnablocs as the name suggests, are magnetic blocks. (the blue blocks in the picture) They are used to ensure accurate form work that is easily constructed and modified. ‘MagnaBloc is comprised of a high impact, polymer body containing powerful magnets and a release screw.’
In place, the unit gives up to 400 kg force, and provides a stable vertical surface with two 8mm fixing holes for attaching timber or metal shutters. Any steel bed or plate can be speedily adapted for variable casting dimensions, without any drilling or welding damage.
The key thing is just how easy the magnablocs are to place and move around, they save time in man hours and materials.
I have known them to be placed on a vibrating table meaning the concrete in the form work is vibrated.
This system is ideally used with a steel base that allows the magnets to attach to the base. The 400Kg force means that the form work is firmly fixed in place.
Precast Concrete 