- Used where a reasonable bearing capacity subsoil can be found olny at depths where beam and slab techniques become uneconomic.
- The construction is similar to reinforced concrete basements excepts that internal walls are used to spread the load over the raft and divide the void into cells
- Openings can be formed in the cell walls , allowing the voids to be utilised for the housing of services , store rooms or general accommodation
Column splice bars (RC slab ) ( coloumns positioned on wall intersections )
opening in wall and
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