RAFT FOUNDATION

RAFT FOUNDATION :-

Raft foundation is generally a thick

concrete slab resting on a large area of

soil reinforced with steel rods and is

used to support columns or walls and

transfer loads from the structure to the

soil.

Raft foundation may be used under the
following conditions:

    1 .The soil has a low bearing capacity.

    2. Load of the structure has to be

        Distributed over a larg area.

   3. Individual or any other foundation area would approximately cover 50% of the

total ground area beneath the

structure.

   2.The columns or walls are placed so

closely that the individual footings

would overlap.

 

  3. Stress on the soils needs to be reduce.

  

  4. There is a possibility of differential settlement in case individual footing is used.

 5. When soil strata are unpredictable and contain Pockets of compressible soil.

  6. The basement is to be constructed.

   7. Any other type of footing cannot be

used advantageously.