Shear tension conversion flexible yielding anti-shearing anchor rod and construction support method thereof

Abstract

The invention discloses a shear tension conversion flexible yielding anti-shearing anchor rod, which comprises a nut, a tray, a friction reducing washer, a core adjusting ball pad, a threaded steel rod body and several segments of tension shear conversion flexible yielding combined structures. The tension shear conversion flexible yielding combined structure comprises a threaded section and locking tool arranged at both ends, and a steel strand and steel protection pipe arranged in the middle, wherein the threaded section, the locking tool and the steel protection pipe are an integrally formedsteel structure, the thread sections at the two ends of the steel structure are respectively connected with the threaded steel rod body through threads; the steel strand is positioned in the middle of the steel protection pipe, the steel strand is locked with the steel protection pipe through the locking tool, and the steel protection pipe is connected with the threaded steel rod body through thethread sections at the two ends; the steel strand is in a bent and relaxed state. By using the shear tension conversion flexible yielding combined structure, the functions of 'high pre-tightening force, flexible yielding, shear tension conversion'can be achieved, and the material defect problems that 'the shear strength is low, the rod body is easily cut off', in a prior anchor rod can be effectively solved.

Description

Technical field [0001] The invention belongs to the technical field of anti-shear bolt support for mine support engineering, and specifically relates to a shear-tension conversion flexible compression-compressive anti-shear bolt and a construction support method thereof. Background technique [0002] The reinforcement effect of the anchor rod is mainly embodied in the restriction of the deformation or movement of the rock along the axial and tangential directions of the anchor rod, that is, the anchor rod will produce the axial tensile effect on the rock swelling deformation and the tangential shear dislocation of the rock layer. Shear resistance. Currently, the commonly used bolts are rebar bolts. Whether it is a low-strength rebar bolt or a high-strength rebar bolt, the shear strength of the bolt is much lower than its tensile strength, and the shear strength is about The tensile strength is about 0.6 times, and some are even lower. However, for rock formations, the shear fai...

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Problems solved by technology

[0003] The invention provides a shear-tension conversion flexible yielding compression shear bolt and its construction support method, which aims to convert the shearing force of the rock formation on the rock formation into the pulling of the anchor rod through the shear-tension conversion flexible yielding pressure combined structure Effectively solve the technical problems existing in the existing bolts such as "high tensile strength, low shear strength, and the rod body is easily cut off", so as to give full play to the tensile capacity of the bolt

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