# How to Calculate Pile Foundation Data

Foundations are probably the most important parts of a building, because they uphold the structural weight and other forces coming down from above. Therefore, if you are supposed to build a structure, you should know very well about how to calculate pile foundation data. This will come very useful early on.

There are four main parts of a pile code. These are as follows:

1. Concrete Piles
2. Timber Piles
3. Under Reamed Piles

The first part, that is the Concrete Pile, is comprised of the following four different sections.

1. Driven cast in situ concrete piles
2. Bored cast in situ concrete piles
3. Driven precast concrete piles

### Changes in Pile Code

The important parts of the pile foundation calculation code that have changed with time are as follows:

• Many terms are revised and their definitions are updated as engineering practices changed around us.
• Previously the minimum grade of concrete to be used in pile foundation was too low and it was found to have caused safety issues. This is why the bar on that has been raised to M25 grade concrete.
• Design parameters with respect to adhesion factor, earth pressure coefficient, modulus of subgrade reaction, etc, have been revised to make them consistent with the outcome of modern research and construction practices.
• Cast in situ concrete piles had their minimum dia of bore set differently before, all that has been changed to 450 mm. The supporting data are:

1. Clear cover over reinforcement, Cl.6.11.4 50×2 = 100mm
2. Dia of vertical bar minimum, Cl.6.11.4 12×2 = 24mm
3. Helical reinforcement minimum, dia Cl.6.11.4 8×2 = 16mm
4. Clearance for operation of Tremie, Cl.6.11.4 4×20 = 80mm
5. Dia of Tremie pipe minimum, Cl.8.4 (c) = 200mm
6. Total dia of pile required = 420mm, say ~ 450mm
• Previously, there were no provisions for the special use of large diameter bored cast in situ concrete piles used in marine structures. This has been added now.
• The following calculation procedures have been modified to bring them at par with the present scenarios and practices:
1. Bearing capacity
2. Structural capacity
3. Factor of safety