Introduction To Pier Foundations
The pier foundation transfers the load on the pier to the ground via the bearing. It is generally a shallow structure placed on top of sound rock layer. Hard soil is also good for pier foundation construction provided they can take the load.
Types of Pier Foundation
There are two main types of pier foundations, namely:
Which type of pier foundation will be used depends upon the depth of the hard bed, nature of soil, and the superimposed load.
Masonry or Concrete Pier Foundation
The sections are generally reinforced with steel wires. At the bottom, a cast steel shoe is provided to hold the structure better and to transfer the load well. The cross sections of these piers are generally no more than 30-50 centimeters and they are no taller than 20 meters.
Drilled Caisson Pier Foundation
A drilled caisson is a large compressed member subjected to an axial load. The load is at the top and the reaction is at the bottom. These can be concrete caisson with enlarged bottom, a steel pipe caisson with concrete filled in it, or a concrete body caisson with a steel pipe core.
Advantages of Pier Foundation
The designing of pier foundations are easy, and there are lots of types available to choose from. You can find any type that suits your building needs.
Because, the construction of pier foundations do not take much excavation or need too much concrete.
The bearing capacity of concrete pier foundation and caisson pier foundation can be increased as the load increases over them. It is possible by under-reaming the bottom.
Piers dug at regular intervals and filled with cement concrete can support arches over them. If necessary a concrete beam may be provided over the arches for the support of walls and other structures above them. This provides good passage of vehicles and water under the structure.
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