An Adaptive Friction Anti-Shear Large Deformation Bolt

Abstract

The invention discloses an adaptive frictional anti-shearing large deformation bolt, which comprises a bolt main body, a connection assembly and a casing assembly; the bolt main body includes a first rod body, a second rod body and a third rod body arranged left and right along the axis ; An anchor plate is installed on the third rod body, and a fastening nut is threaded; the first rod body and the second rod body are connected through a casing assembly, and the second rod body and the third rod body are connected through a connecting assembly; The assembly includes a support sleeve and a first adjustment assembly that expands left and right. The support sleeve is detachably set between the first rod body and the second rod body, and forms an inner cavity with the first rod body and the second rod body. The first adjustment assembly is located at In the inner cavity, the two ends are respectively fixedly connected with the first rod body and the second rod body. The self-adaptive frictional anti-shear large deformation bolt has simple structure and low cost, can effectively adapt to the shear deformation of rock mass, and plays a good supporting role on rock mass.

Description

technical field [0001] The invention relates to the technical field of rock-soil anchorage, in particular to an adaptive frictional anti-shear large deformation bolt. Background technique [0002] With the development of large-scale engineering construction in our country, more and more slope stability problems appear accordingly. Slope instability often causes geological disasters such as landslides, which poses a serious threat to the normal construction of the project and the safety of people's lives and properties. [0003] A landslide is generally composed of a sliding bed, a sliding belt, and a sliding mass. It refers to the failure phenomenon that the rock mass falls and slides downwards along a certain weak structural surface or shear zone under the action of gravity or other influencing factors. Long-term stability, people often use bolts to fix in the rock mass for support. The traditional anchor rod is an integral rod body structure, which has insufficient deform...

AI Technical Summary

Problems solved by technology

The traditional anchor rod is an integral rod body structure, which has insufficient deformation resistance and shear resistance. For example, when the slope rock mass undergoes large deformation and shear displacement, the anchor rod is easily sheared near the shear zone or at the anchor head, thus Loss of support, eventually leading to landslides and other geological disasters

In addition, in deep roadway support engineering, due to the influence of high ground stress, high ground temperature or complex rock mass structure, the surrounding rock of the roadway often staggers or moves, resulting in double shear stress and axial pullout force of the bolt. Breakage occurs under the action, and the anchoring effect is lost; in addition, although the high-strength anchor rod has improved deformation resistance and shear resistance, its processing cost is relatively high

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