SLAB & BEAMS
Checking of shuttering material
Height of slab from plinth / slab level.
Quality of shuttering material.
Proper fixing of cap on column to take load of beam & slab shuttering.
Width of beam bottom plank.
Proper fixing of beam bottom cap.
Line & level of beam bottoms.
Depth of beam as per R.C.C. drawings.
Proper fixing of props for bottom in line & plumb at every 0.6 m internal.
Packing below props only one or two wooden plank pieces is allowed. (No bricks or blocks are allowed).
Proper fixing of side beam in line, level & plumb.
Support to vertical joint of shuttering for 0.6 m beam or 0.75 m beam.
Gaps in beam sides to be filled.
Ensure fixing of steel plates over beam sides in flush position.
Slab plates should be supported by 3″x3″ chavis at 2’0″ (0.60 m).distance center to center.
‘Side plank’ for slab panel periphery (Dhar falee).
Individual level of each bay of slab.
Marking thickness of slab.
Water tightening of plates joints & ghabadi work.
Oiling of slab shuttering.
Internal panel measurement, beam-to-beam & diagonal of panel.
Location & depth of sunken slab.
Outer line of beam sides.
Room sides & diagonals.
Water tightness near junctions of columns & beams.
Bamboo bracing for joining, prop to prop at 4’0″ height from floor.
Checking of reinforcement for Beams.
Bottom bars, top bars, bentup bars, stirrups, distance of bentup bars from face of supports, spacing of the stirrups as per R.C.C. drawing, proper tying of stirrups.
Diameter of bars, binding of stirrups in plumb.
Length of bentup bars projecting in the adjacent beams.
L for bentup at discontinuous end.
Side covers & bottom covers for beams.
Pin is provided at required places between reinforcement.
Proper binding of laps in beam if provided with required length.
Extra stirrups at the junction of beams.
Steel for slab.
Spacing, diameter of bent up bars & main bars.
Distance of bent ups from face of beam.
Length of bent up bars projecting in adjacent bays.
Height of the bent up bars.
Chair below each & every bent up bar.
Covering for slab at bottom.
Proper binding of laps of required length.
Distribution steel diameters, spacing & ties.
Dowels of slab & beam.
Location, proper binding diameter & length of fan hook & quality of the hook box.
Stirrups in column for upper floor column size.
Care to be taken before / after casting of slab
To check the concealed electrical conduit work for slabs as per drawing; check I.S.I mark on P.V.C. pipes& note down the length of all pipes for billing purpose.
Check the junctions & all electrical layout, position of fan points, M,S, boxes, junction boxes.
Avoid breaking of pipes during concreting.
Certificate from Architect.
Certificate from R.C.C. consultants.
Management before / after casting of slab.
The stock of cement , sand & metal required for casting of slab.
Arrangement of water & standby arrangement of water in case of electrical failure.
Labour strength required & available for slab casting.
Inform contractor about starting time of slab & maximum allowable time for slab casting.
Decide the position of concrete joints in case of big slab after consulting & approval of R.C.C. Consultant.
Casting of slab with the help of mixer ,vibrator & measuring box.
Machine operator for mixer & vibrator is present on site.
Proportion of aggregate decided.
Casting of six cube moulds of various batches for testing.
Ensure cleaning of wooden pieces, papers etc. from slab, beam before casting.
Proper levelling of slab by mason.
Maintaining slab register.
Arrangement of planks over slab for labour movement along with the M.S. walk ways for avoiding the disturbance to top reinforcement.
Arrange petrol & diesel for vibrator & mixer.
Ensure the working of materials lift before commencement of work. Ensure for rigid scaffolding of lift.
Sufficient light arrangement in case of late night concreting.
Checklist after concreting
Deshuttering of outer beams after 24 hours.
Making small bonds in sand & cement mortar (1:10) for ponding method of curing for slab, with each bay having maximum size of 2.0 m x 2.0 m.
Removal of waste material like sand, metal & steel pieces?
Deshuttering of internal beam sides after 48 hours?
Curing of slab for 28 days.
Painting the date of casting of slab on front & side beam.
Register in head office, next day after casting.
Deshuttering of slab after 7 days, 10 days or 15 days depending on spans.
Hacking of beam sides, beam bottom, slab bottom.
Minor honey combing surfaces, finished with rich mortar.
Major honeycombing shall be brought to the notice of R.C.C.Consultant.
How To Cast RCC Slab | 5 Points You Must Check Before Slab Casting |
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CIVIL ENGINEER
AVINASH SHARMA
POSITIVE BUILDER
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