2. Working
Timeline
Is a method of constructing
concrete buildings by casting the
floor or roof slab on top of the
previous slab and then raising
(jacking) the slab up with
hydraulic jacks.
L I F T S L A B
3. Working
Timeline
This method of construction allows
for a large portion of the work to
be completed at ground level,
negating the need to form floor
work in place.This construction
technique is useful in quickly
creating structures with repetitive
formwork, like parking ramps.
L I F T S L A B
6. A concrete slab is first poured on the
ground level.
Lifting collars are set around each of
the columns and cast into place as
the slab is poured around them.
The lifting collars will later be used to
support the slab as it is raised and
secured in place.
CONS
TRUC
TION
7. Subsequent floors and the roof are
then poured and formed on top of the
initial ground slab.
Wax dissolved in volatile mixture are
used between each floor plate to
allow the slabs to separate as they are
raised.
CONS
TRUC
TION
9. Along with reducing the formwork
required to create the slabs, slabs can
be easily protected from inclement
weather since all of the slabs remain
together during the curing process.
CONS
TRUC
TION
11. Once the slabs have been raised to
their desired height the lifting
collars are welded to the columns,
along with shear blocks to support
the slab from beneath.
To assure the security of a structure
during the raising of the slabs, the
hydraulic jacks, attached to the top
of the columns, use synchronized
consoles to lift the slabs at an even
rate.
LIFT
ING
14. Conventional methods of mounting
the jacks to the columns require that
the jacks are removed before
continuing to raise the slabs. More
recent approaches utilize welded
plates, separated from the columns, to
support the jack.
LIFT
ING
15. In Latin America, contractors have
started to use a form of lift slab
construction where load-bearing
concrete walls are raised at the same
time as the floor slabs.
Both the wall panels and the floor
slabs are cast on the ground.
FLOOR
and
SLAB
16. The walls are attached to the slabs
through hinges formed by plastic
ropes.
As the floors are raised, the walls
unfold into place and form the
vertical support for the system.
FLOOR
and
SLAB
23. THANKYOU FOR LISTENING
GALERO, HANNA MARIE PAULINE
GREFIEL, JARED
MACASUSI, GLAIZA MAE A.
ABAD, FRAN MARK
CALUMPIANO, SHEENA JAE
CARVAJAL, LORENCE
DE GUZMAN, GERALDINE
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