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Choose the Perfect foundation for your home!!

Posted by admin on December 18, 2018
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FOUNDATIONS, SUB-STRUCTURES, SUPER-STRUCTURES

  Foundation in construction. A foundation is a lower portion of building structure that transfers its gravity loads to the earth. Foundations are generally broken into two categories: shallow foundations and deep foundations. A tall building must have a strong foundation if it is to stand for a long time.

SHALLOW FOUNDATIONS

  Shallow foundations are also called spread footings or open footings. The ‘open’ refers to the fact that the foundations are made by first excavating all the earth till the bottom of the footing, and then constructing the footing. During the early stages of work, the entire footing is visible to the eye, and is therefore called an open foundation. The idea is that each footing takes the concentrated load of the column and spreads it out over a large area, so that the actual weight on the soil does not exceed the safe bearing capacity of the soil.

STRIP FOOTINGS

Strip footings are commonly found in load-bearing masonry construction, and act as a long strip that supports the weight of an entire wall.  These are used where the building loads are carried by entire walls rather than isolated columns, such as in older buildings made of masonry.

RAFT OR MAT FOUNDATIONS

A raft foundation, also called a mat foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground. 

  A raft foundation is often used when the soil is weak, as it distributes the weight of the building over the entire area of the building, and not over smaller zones or at individual points. This reduces the stress on the soil.

PILE FOUNDATIONS

  A pile is basically a long cylinder of a strong material such as concrete that is pushed into the ground to act as a steady support for structures built on top of it.
Pile foundations are used in the following situations:

  When there is a layer of weak soil at the surface. This layer cannot support the weight of the building, so the loads of the building have to bypass this layer and be transferred to the layer of stronger soil or rock that is below the weak layer.

  • When a building has very heavy, concentrated loads, such as in a high rise structure, bridge, or water tank.Pile foundations are capable of taking higher loads than spread footings.

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