Cast in situ piles are concrete piles that are constructed by excavating soil and pouring concrete directly into the hole. There are several types of cast in situ piles including simplex, franki, and vibro piles. The simplex pile is most common in Bangladesh. To construct a simplex pile, a casing is installed and reinforced with rebar before concrete is poured into the casing while it is vibrated out of the ground. Cast in situ piles are preferable to driven piles in areas with noise limitations, existing structures nearby, or weak and loose soils. The construction process involves soil testing, boring, installing rebar cages, and pouring concrete through a tremie pipe.