Drilled Structural Tie-downs (anchors)

what are drilled structural tie-downs & anchors?

Drilled Structural Tie-Downs, also referred to as Anchors, are deep foundation elements designed to resist uplift and tensile forces acting on a structure. Rather than supporting primarily downward loads like a conventional pile, a tie-down anchors a structure to the ground below. These tension elements are typically installed below shear cores of high-rise structures or where tension loads are required. They consist of double corrosion protected threaded bars or strands that are inserted into a small diameter drilled shaft filled with cementitious grout. Upon completion they are proof or performance tested in accordance with PTI requirements and locked off at the desired load.

what are the advantages of tie-downs & Anchors?

Tie-downs and anchors can provide substantial resistance to uplift by transferring tensile forces deep into competent soil or rock. Drilled anchors are installed using drilling equipment rather than pile-driving methods, making them well suited for projects adjacent to existing buildings and sensitive structures. Anchor length, diameter, orientation, and capacity can be designed around the project’s structural requirements and subsurface conditions.