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Posted: Sun Feb 01, 2004 4:00 am Post subject: Casting partly after 2-3 days!
Casting beams or slabs part by part is quite common practice ! For many reasons it is not always possible to cast the slabs and beams at the same time. Suppose for instance there are inverted beams (upstand) then in such cases beams are casted after day or two , after the slab concrete hardens slightly so that shuttering for the beams are easily placed. Many times beams are concreted at first phase and the slabs dowels are just left from the beams .. which are concreted later. In such case the designer must design the 2'nd phase element for some extra moments. Suppose the slab is to be cast at phase-II , then in such case dowels from beams (for the slabs) are to be left during the beam casting , now when you are concreting the slab at phase II then also one can say that the BEAM-SLAB element acts as monolithic. There is absolute no harm in casting structural elements in parts (provided some extra precautions to be taken for obvious reasons). Remember One thing , for they who say that it is absolutely necessary to cast all the structural elements together - please note that then in such case it is also absolutely necessary to cast the entire building together which can't be done for obvious reasons ) - Thus we do level by level casting . When we can cast the Columns step by step why can't we cast other structural elements ?!?!
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