a) The face of formwork in contact with the concrete should be cleaned and treated with the form release agent (shutter release oil).
b) All props should be vertical. All propping for staircase, formwork must be vertical also � not slopping. To ensure no slippage use a wedge.
c) Slab forms (plates) of size 600 X 900 should be spanned in a direction perpendicular to the length of the plate stiffener.
d) The first prop for the beam bottom should be placed at 230 mm from the face of the column.
e) A prop should be placed at the centre of the beam bottom. (where the deflection is maximum).
f) All other beam bottom props should be placed so that the spacing between them does not exceed 600mm c/c.
g) All the props above 3 meter height should be braced.
h) All sloping chajja props should be compulsorily braced
i) Props for the sloping staircase and chajja should be vertical. The connection between the prop top and the staircase sofit is to be achieved with the help of wedge system.
MINIMUM TIME FOR DESHUTTERING OF FORMWORK
Minimum period before deshuttering
a) Vertical formwork to columns , 24 hours
walls, beams
b) Sofit formwork (plates or plywood)
with props for slabs
1) spanning upto 4.5 m 10 days
2) spanning over 4.5 m 14 days
c) Sofit formwork (plates or plywood)
with props for beams and arches.
1) spanning upto 4.5 m 14 days
2) spanning over 4.5 m 21 days
