a perimeter pile anchor foundation is built by forming a plurality of individual perimeter pile anchors in a large generally circular pattern to form a perimeter wall . the individual pile anchors are contiguous , each pile overlapping the adjacent piles on either side . the overlapping pile anchors form an arch such that compression and friction between the pile anchors resist soil caving and sloughing pressure when soil inside the perimeter wall is excavated , enabling the perimeter pile foundation to be effectively constructed in weak saturated soils and / or cohesionless sands that will not allow conventional concrete foundation excavations . a concrete foundation ring is formed inside the pile perimeter wall to support a tall and / or heavy tower or other structure subject to high upset forces .