Formwork is used to mold concrete into desired shapes for slabs, beams, stairs, and other structures. It is made from various materials like wood, plywood, steel, aluminum, and plastics. Proper formwork design and installation is important for quality, safety, and cost-efficiency. Formwork must be assembled correctly, have concrete properly placed, and then stripped at the right time. Different formwork techniques exist for slabs, beams, stairs, and other elements. Factors like reusability, weight, cost, and construction speed influence the choice of formwork material and system.

1. FORMWORK FOR SLABS,BEAMS
AND
STAIRS
PRESENTED BY:
RAKHI DEV
RASHMI. R
SUNIDHI MADHAV
SWATHE

2. Formwork for concrete
structures has a
significant impact on
the cost, time, and
quality of a completed
construction project.
Formwork is the term given to either temporary or
permanent moulds into which concrete or similar
materials are poured

3.  Wood
 Plywood
 Steel
 Aluminium
 Plastic
 Plaster
 Synthetics materials
B
QUALITY
SAFETY
ECONOMY

4. Assembly
and erection
Concrete
placement
Stripping and
dismantling

5. In a typical reinforced concrete building frame, the
slabs are the primary load carrying element.
They transfer their load to
secondary elements such as walls or beams.

9. TIMBER
FORMWORK

11. BEAM FORM

14. Installation of formwork for first floor slab and
beams progressing all around the building

15. DISADVANTAGES
Easy Handling –
Lightweight
Easy assembling
Flexible
Easy to produce
Repaired parts
can be easily
replaced
Easily available
Speed reduced
for larger
structures
 not many
reuses
May asorb
moisture from
concrete
Shrinkage and
warping
ADVANTAGES

16. CONVETION STYLE

17. INCORRECT BEHAVIOUR

18. SHUTTERING FOR SLABS WITH TIMBER BEAMS

20. FIXING THE
FORMWORK
SUPPORT OF
FORMWORK
Use of 18mm plywood sheets.
In the construction of the slab and beam formwork, it is
need to give a proper attention to the levels, shape and
the alignment of the particular structural element.
It is need to check the level at the initial state of erecting
the formwork and before the concreting is done.
Otherwise the level of the slab can change after the cast .
So also, the stop boards at drops should be well positioned
and fixed correctly before the concreting.
 Diesel should be applied inside of the formwork
which is touched the concrete surface to easy removal
of formwork.

21. STEEL FORMWORK
Consists of panels
Usage of clamps, bolts and nuts
Panels fabricated In large number
Used I large projects ad where there are high number
of reuses
Suitable for circular ad curved structures.
Limited size ad shape. Excessive heat loss
Limited fixing
Uniform surface
Larger spans ad more durale. Does not absorb water
from concrete

22. LIGHT METAL SHUTTERING

23. C
O
M
B
I
N
E
D
S
H
U
T
T
E
R
I
N
G

27. PERMANENT FORM WORK

28. USING PLASTICS

29. Combination of main beam and sliding wedge, this
new and innovative system makes set-up and
stripping faster, and reduces the turn-around time of
the equipment.
20x60 cm panels (weighing each max. 11 kg) and by 3
plastic beams placed upon traditional wooden trusses.
This system allows to advance the stripping operation.
This the ideal solution to build any kind of slab:
bidirectional, full or lightened.
The panels can be carried by hand by a single person
without the aid of a crane or of heavy lifting
equipment.
Resistance to chemicals, termites ad fungi
Use of electric power not required

30. Weight of throat of stairs
to e supported
Formwork should e tied
together to prevent sideways
movement.
Sideways movement is
mainly because of the slope
of stairs
A basic principle of stair
formwork is that the
treads are not formed,
but left open. A normal
good quality concrete mix
with a standard slump,
(that is not too wet) will
swell up slightly under
vibration, but it should
not pour out of the
bottom in a flood.

33. CONCRETE STAIRS WITH HALF SPACE
LANDING
A mixture of
steel props and
maybe steel "h"
frames under
the landing, and
good old form
ply and timber
struts and
braces.

34. The soffit
(underneath side)
ply and supports of
the landing run
through wider than
necessary for just the
concrete, to support
the timbers for the
upper flight of the
stair.
You can see that all
the smaller supports
are cut out of timber.
The formwork will
stay in place at least
a week.

35. WIDER STAIRS SHOWING MORE STRONG BACKS
When the stairs are wider, using more than one Strongback.
There are two strong backs supporting the riser timbers.
There is no limit as to how many and how wide the stair can
go.

36. SOFFIT FORMWORK FOR A FLIGHT OF
CONCRETE STAIRS

37. STEEL STAIRS
Reduced construction times – achieved because
manufacture and site preparation can occur
simultaneously with quick and straight
forward installation, ensuring faster enclosure of the
structure, minimal delay to work being carried out by
other trades, and limited site congestion with no delays
resulting from external weather conditions.
Substantial cost savings over conventional formwork
methods.
Permanent steel handrails may be fitted immediately
eliminating the need for temporary safety rails.
No topping of stairs to repair damage which occurs during
construction.
The riser profile provides a ledge at the bottom for the
concreter to trowel to.

40. they contain the
fill at the center
of the pour with
a metal mesh
box This way
they could use
much less
concrete than if
the landing and
stairs had been
solid.

41. Formwork is essential in the success of any construction project involving
concrete. If designed and set-up correctly, it will function as planned. If not,
any of a number of costly problems can occur
Reusable – panel form
non reusable – stationary form
STRIKING
MAINTENANCE
STORAGE OF FORMS

42. Metal beam slab formwork
The stringers and
joist are replaced
with aluminium for
ming systems or
steel beams and
supports are
replaced with metal
props.
This also makes
this method more
systematic and
reusable

43. Modular slab formwork
These systems consist of prefabricated timber, steel or aluminium
beams and formwork modules.
does not require a crane to place the formwork, speed of
construction with unskilled labour, formwork modules can be
removed after concrete sets leaving only beams in place prior to
achieving design strength.