Jumpform is a type of climbing formwork used to construct tall vertical concrete elements like elevator cores, stair shafts, and bridge pylons. After a lift of concrete hardens, the entire formwork assembly is detached, raised by cranes or hydraulic jacks, and reattached to the newly cast concrete to pour the next level. This eliminates the need to dismantle and rebuild forms for every floor.
The crane is scheduled to lift the jumpform on the central core at 0600 tomorrow.
Self-climbing jumpforms use integrated hydraulics, freeing up tower crane time for other lifts.
Also heard as
- Climbing form
Related terms
Formwork
The temporary molds, supports and bracing that hold fresh concrete in shape until it can carry itself.
Lift
One layer of concrete placed in a wall, column or mass pour, or the height cast between horizontal joints.
Shutter
A temporary panel or board used to contain wet concrete until it hardens.