PILE FOUNDATIONS

These foundations are called as deep foundations. A pile is a slender column made of concrete, wood, or steel. A pile is either driven into the soil or by excavating a hole formed in situ and then filling it with concrete. A group of piles are driven to the needed depth and with R.C.C. slab it's capped, over which super structure is built. by friction or by direct bearing the pile transfer the load to soil, in the latter case, piles being taken up to hard strata. When top soil is not capable of taking the load of the structure even at 3-4 m depth ,this type of foundations is used

                           (a) Bearing pile                                                                   (b) Friction pile

                                                                        Pile foundations