The self injectable tierod load capacity may be defined by the calculation method proposed by the Engineers Ivan Joppert Jr., William Mallmann and Walter Iorio, presented at SEFE V Seminar of Engineering and Special Foundations and Geotechnics, as:

Rrup = 9,2 x Nspt x Ø x L x K, where:

Rrup - Tie-rod rupture load
Nspt - SPT average number in the region of anchoring bulb implantation
Ø - diameter of the perforating element (tricone or drill) in meters
L - anchoring length of the tierod in meters
K - coefficient subject to the type of soil defined in t/m2 according to the following table: