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

Abstract

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.

Description

technical field [0001] The invention relates to an anchor rod used for tunnel engineering support, in particular to a large-deformation anchor rod with the function of increasing resistance and allowing pressure. Background technique [0002] Bolt shotcrete support is an important support method in tunnel engineering, and anchor rod is an important support material. In the construction of modern tunnels, the geological and stratigraphic conditions that the tunnel passes through are becoming more and more complex, and the surrounding rocks often show the characteristics of large deformation, and the stability of the surrounding rocks is becoming more and more prominent. However, the existing bolts have poor deformation capacity and cannot adapt to the large deformation characteristics of the surrounding rock. When the large deformation of the surrounding rock exceeds the capacity range that the bolt can bear, it will easily lead to the failure of the bolt support system and t...

AI Technical Summary

Problems solved by technology

However, the existing bolts have poor deformation capacity and cannot adapt to the large deformation characteristics of the surrounding rock. When the large deformation of the surrounding rock exceeds the capacity range that the bolt can bear, it will easily lead to the failure of the bolt support system and the instability of the surrounding rock. , tunnel structure damage

[0003] In order to adapt to the characteristics of large deformation of the surrounding rock and overcome the shortcomings of the existing traditional bolts with poor deformation ability, a large deformation bolt appeared

For example, patent 201110061360.9 provides a friction sleeve type large deformation anchor rod, but it uses mechanical friction to realize the deformation and elongation of the anchor rod, and the structure is relatively complicated; 201210139092.2 provides a new type of high strength constant resistance large deformation anchor rod, which requires Reaming is inconvenient for construction

Images