Precast concrete foundation construction is an off-site construction technique in which the foundation units are pre-engineered and manufactured in a controlled environment. These units as are pre-engineered, their capacities or the limits are communicated with the purchaser to produce the desired unit.Some of the important features, advantages and disadvantages of pre-cast concrete foundations are explained briefly in this article.
Precast Concrete Foundation Construction
The precast concrete foundation technique is very prominent today. The airtight and weather resistant property of these types of foundation makes it common.

The design of the precast concrete foundation is performed by considering the following important parameters:

Determination of soil type and its bearing capacity
Checking with the precast concrete foundation manufacturer that the foundation unit can safely support the calculated loads.
Design of the footing
Checking for the uplift.
Once the foundation units are manufactured and bought to the construction site, they are installed on an undisturbed soil layer.

In the case of a precast pad foundation, the pad foundation unit is placed over a lean concrete layer that was already prepared. Over the pad foundation, a precast column is placed. The bent bars kept out of the column are inserted inside the foundation element as shown in figure 1. The column rebars are embedded inside the precast foundation by a final casting using concrete. When the work is complete, the adjustment devices and arrangements are removed.@PrestonYT