Patent ID: 7037045

Claim:
A modular helical piering system comprising: a plurality of tubular shafts, each shaft having a substantially rectangular cross-section with first and second ends and holes adjacent to the ends of the shaft; said first end receiving the second end of an adjacent shaft with the hole in the first end aligned with the hole in the second end of the adjacent shaft and the corners of the first end engaging the corners of the second end of the adjacent shaft; a first pin removably insertable through the aligned holes in the ends of the shafts; a helical blade having a hub with an axial passageway having a substantially rectangular cross-section to receive an end of a shaft, said hub further having a hole for alignment with a hole in the shaft in the passageway; and a second pin removably insertable through the aligned holes in the hub of the helical blade and the shaft in the passageway of the hub.