 Place
ribs from setting out point as indicated
on drawing at approximate centers. Space
accurately by placing one closed-end
hollow block at each end of span.In
accordance with SABS 0100,
minimum bearing of 35mm onto load bearing
brickwork.
Erect suitable temporary
propping under indicated position of
stiffener ribs (maximum 1800mm
centers) and level to specified
camber.
Prop (if required)
before placing balance of hollow blocks
as detailed. Leave out blocks for
stiffener ribs as per drawings.
Place stiffener rib (cross-rib)
reinforcement. Install services over
blocks and not on top of ribs (N170
and N255 slab services are to be placed
as per diagram).
Then place mesh over blocks (NB:
No mesh required for N range blocks).
Remove excess rubble from
ribs and blocks and thoroughly wet slab
before casting concrete.
Before placing any concrete
slabs are to be inspected by the
supervising engineer or
appointed representative.
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