Segmented bidirectional large-deformation anchor rod

Abstract

The segmented bidirectional large-deformation anchor rod comprises a hole outer section anchoring part, a hole opening section anchor rod body, at least one hole middle section anchor rod body and a hole bottom section anchor rod body which are sequentially connected. The head ends of the hole opening section, the hole middle section and the hole bottom section of the anchor rod are all arranged in the constant resistance device and are fastened; the tail end of the anchor rod is in threaded connection with a connecting chain, and the connecting chain is further connected to the next structural unit; the connecting chains are connected in a retaining ring mode so that large deformation of the anchor rod in the vertical direction can be achieved. The anchor rod is divided into a plurality of sections, each section is provided with the constant-resistance device, large deformation of the anchor rod at different positions is achieved through sliding of the constant-resistance devices at different positions so that the anchor rod can coordinate with a non-uniform displacement field of surrounding rock, in addition, the anchor rod sections are connected through the connecting chains, rotation of the anchor rod in the tangential direction is achieved, and the anchor rod adapts to large shear deformation of the surrounding rock; and shear fracture of the anchor rod is prevented.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering support, and relates to reinforcement equipment for tunnels or side slopes, in particular to a segmented two-way large-deformation bolt. Background technique [0002] In the deformation control of tunnel surrounding rock or slope rock mass, bolt is a commonly used reinforcement method, which can effectively improve the tensile strength and shear strength of surrounding rock mass in the reinforcement area, and restrain the deformation of surrounding rock. However, with the increase of the buried depth of the tunnel and the increasing number of high and steep slopes, the prominent contradiction between low surrounding rock strength and high ground stress values ​​makes the tunnel surrounding rock prone to large deformation disasters, or high and steep slopes are prone to overturning and sliding Large deformation damage. Due to its low elongation and low yield strength, traditional ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a segmented two-way large-deformation anchor rod to solve the problem that the existing large-deformation anchor rod can only produce large axial deformation at the bottom of the hole or the hole opening, which is difficult to adapt to the uneven displacement field of the surrounding rock, and cannot Adapt to the problem of large shear deformation of surrounding rock

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