Method of building a grid system wherein a plurality of modular apparatuses can be arranged at a structure site. The plurality modular apparatuses can have a central tubular member having an inner bore formed between a proximal end and a distal end, and a plurality of vanes having a lateral width at least equal to a diameter of the central tubular member. The one or more modular apparatuses can be positioned above a surface of the structure site. Each of the plurality modular apparatuses can be connected with at least two adjacent modular apparatuses of the plurality of modular apparatuses via a locking lug on one of the plurality of vanes slidingly engaged with a locking channel on an adjacent modular apparatus. The plurality of modular apparatuses can then be driven into the structure site wherein the inner bore receives earthen formation therein.