Resistance-increasing yielding large-deformation anchor rod and construction method thereof

The invention discloses a resistance-increasing yielding large-deformation anchor rod and a construction method thereof. The resistance-increasing yielding large-deformation anchor rod is composed of deformation springs, anchoring rods, fixing balls and connecting sleeve barrels; high-strength extension springs are adopted as the deformation springs, solid metal rod bodies are adopted as the anchoring rods, hollow elliptical metal ball bodies are adopted as the fixing balls, and each fixing ball is provided with connectors with outer threads; the deformation springs and the corresponding anchoring rod are sequentially connected between two corresponding fixing balls through the corresponding connecting sleeve barrels with inner threads to form a structure unit of the resistance-increasing yielding large-deformation anchor rod; a plurality of the structure units are assembled according to the anchoring depth or length, and the end of the outermost structure unit is further connected with one anchoring rod segment for allowing a tray and a nut of the anchor rod to be installed, and then the resistance-increasing yielding large-deformation anchor rod is formed. The resistance-increasing yielding large-deformation anchor rod can be tensioned to deform when surrounding rock generates large deformation, the resistance is steadily increased simultaneously, and therefore the stability of the surrounding rock is effectively kept.