Quick Answer: What are the three types of raft foundation?

What is the raft foundation when is it preferred?

Raft foundation is generally used to support structures like residential or commercial buildings where soil condition is poor, storage tanks, silos, foundations for heavy industrial equipment etc.

What is a raft foundation used for?

A raft foundation is a reinforced concrete slab under the whole of a building or extension, ‘floating’ on the ground as a raft floats on water. This type of foundation spreads the load of the building over a larger area than other foundations, lowering the pressure on the ground.

What is the difference between strip and raft foundations?

Strip foundation is used to support a line of loads such as load-bearing walls. … Raft foundation consists of a concrete slab which extends over the entire loaded area so that loads from entire structure are spread over a large area leading to a reduction of the stress of foundation soils is reduced.

How deep are slab foundations?

The foundation that your house is built on can have a major impact on the structural integrity of your home. A slab foundation is made of concrete that is typically 4″–6″ thick in the center. The concrete slab is often placed on a layer of sand for drainage or to act as a cushion.

How do you build a raft foundation?

Raft Foundations are built is this following steps:

  1. The soil removed down to correct depth.
  2. The foundation bed is then compacted by ramming.
  3. Lay reinforcement on spacers over the foundation bed.
  4. Pour the concrete over the reinforcement.
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What is foundation spread?

Spread foundations are foundations at shallow depths of burial where the ground resistance on the sides of the foundation does not contribute significantly to the bearing resistance. Some of the provisions in this Section may also apply to deep foundations, such as caissons and piers [C6.