Raft Foundation

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Portrait of Raft Foundation Raft foundation stands for a solid concrete beam that's made on an far-reaching area of soil corroborated with brand. It provides support to the columns or walls and transmits loads from the structure to the soil. Ordinarily, mat foundation is expanded across the whole area of the structure it's supporting.

Raft foundation normally provides support to the structures like homelike or marketable edifices where the nature of soil is weak as well as magazine tanks, silos, foundations for weighty man-made paraphernaliaetc.

Working Concept of Raft Foundation The main purpose of raft foundation is to transfer the total haul from the edifice to the complete ground bed area. The raft foundation comes with a really easy stress dispersal system. Total weight of the structure and constitution- weight of the mat is measured and divided with the total area of the foundation being covered for working out the stress on the soil.

For raft foundation, the contact area of the foundation with soil is mean than any other type of foundation, as a result the payload is dispersed across a mean area and so the stress on soil becomes low and the chance of shear failure of soil is also minimized.

Raft Foundation-Raft foundation:

1. The soil contains a low bearing strength.
2. Payload of the structure should be dispersed across a mean area.
3. Individual or any other foundation area would roughly cover 50 of the total ground area underneath the structure.
4. The columns or walls should be arranged scarcely in order that the individual footings can overspread.
5. Stress on soil should be minimized.
6. Differential pact may occur when individual footing is used.
7. When soil strata are unforeseeable and comprise of pockets of compressible soil.
8. The construction for basement should be started.
9. Any other type of footing isn't applied expediently.

Different types of Raft foundations:

1. Flate plate mat
2. Plate thickened under the column
3. Two- way shaft and crossbeam Raft
4. Plate raft with pedestals
5. Plied raft
6. Rigid Frame Mat or Cellular Raft Foundation

Stuff Used for Raft Foundation:

• Formwork
• Spacer
• Spur
• Concrete