Threaded metal yielding anchor rod device

Abstract

The invention provides a threaded metal yielding anchor rod device including a fixed anchor head, an anchor rod body, a metal head, a metal protection sleeve and a thread yielding ring. The thread yielding ring is disposed in the metal protection sleeve in the form of an internal thread, and the diameter of the metal head is greater than the minor diameter of the thread yielding ring and smaller than the internal diameter of the metal protection sleeve. During the use, the fixed anchor head is mounted in a drilled hole of a surrounding rock, and the metal protection sleeve is mounted in a drilled hole port of the surrounding rock; one end of the anchor rod body passes through the thread yielding ring and is connected with the fixed anchor head, the other end is connected with the metal head, and the metal head is placed in the metal protection sleeve. The thread yielding ring is disposed in the metal protection sleeve in the form of the internal thread, since the thread is continuous and uninterrupted and there is no gap between two yielding rings, when the metal head causes axial deformation of the thread yielding ring, an acting force is continuous, a stable and continuous yielding effect is generated, and the yielding effect is improved.

Description

Technical field [0001] The invention belongs to the field of supporting equipment for underground engineering in coal mines, and specifically relates to a threaded metal pressure letting bolt device. Background technique [0002] The common supporting equipment in the support of geotechnical engineering, tunnel engineering, and slope engineering is anchor rod and anchor cable. Traditional supporting equipment often adopts rigid structure due to the limitation of material and structure, and the elongation rate of anchor rod There are restrictions on the pull-out resistance of the anchor cable and the anchor cable. For geological conditions with relatively developed rock mass fractures and large deformation damage, support failures often occur, resulting in dangerous conditions such as instability of the surrounding rock, and it is urgent to adopt a method that can tolerate large deformations Energy-consuming bolts / cables to solve engineering support problems. [0003] The existing ...

AI Technical Summary

Problems solved by technology

[0002] In the support of geotechnical engineering, tunnel engineering, and slope engineering, the common support equipment is anchor rod and anchor cable. Traditional support equipment often adopts rigid structures due to material and structural limitations. The elongation of the anchor rod The pull-out force of the anchor cable and the anchor cable are limited. For geological conditions where rock mass cracks are relatively developed and deformation and damage are relatively large, support failures often occur, resulting in dangerous situations such as surrounding rock instability. energy-consuming bolts / cables to solve engineering support problems

[0003] The existing large-deformation bolts / cables are mainly divided into two types in terms of function: one is to use special flexible materials as the rod body and anchor cable structure, and to use the special properties of flexible materials to allow larger Deformation load, the ductility of this type of material is generally high, and the cost is relatively high; the second type is to install a special compressive structure in the anchor rod and anchor cable. Use friction or compression to lose the deformation energy of the rock mass, so that the bolt / cable can produce constant resistance or variable resistance and other decompression effects. This is usually done by setting a pressure relief ring, but the existing pressure relief ring They are all discontinuous, resulting in the inability to carry out the pressure yielding effect continuously

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