An expanded-diameter extrusion friction anchor rod and anchor cable structure

Abstract

An expanding extrusion friction anchor rod / anchor cable structure belongs to the technical field of coal and rock mass power supply and soft rock support and includes a sleeve, a large diameter area,an expanding area, a small diameter area, a nut, a tray, a limiting stopper, a rod body, a cable body, a straight groove, a clamp, a guide groove and an anchor. According to the invention, a constantresistance is generated through expanding extrusion and friction between an anchor rod tube expander or an anchor cable tube expander, and a deformation volume is provided for relative slippage of theanchor rod tube expander or the anchor cable tube expander, so that a specific high support constant resistance is provided for a supported surrounding rock so as to make the supported surrounding rock always in a three-direction stressed state and thus to form an annular support pressure arch with a comparatively large thickness. Also, a specific amount of deformation energy and impact energy can be absorbed through axial slippage of the expanding extrusion friction rod / cable structure and the associated deformation of the supported surrounding rock. Finally, effects of constant resistancesupport and relief energy absorption support are achieved and the stability of the supported surrounding rock is ensured in the maximal level.

Description

technical field [0001] The invention belongs to the technical field of coal rock mass dynamic support and soft rock support, and in particular relates to a diameter-expanding extrusion friction bolt and anchor cable structure. Background technique [0002] In coal mines, metal mines, water conservancy, tunnels and other geotechnical engineering, bolts are efficient and widely used active support components. However, with the development of our country's economy, the scale of the project continues to expand, and the geological conditions it faces are becoming more and more complex. In shallow rock mass engineering, under the action of external factors such as earthquakes, human disturbance, water, or internal factors such as rock mass self-expansion, the rock mass loses its bearing capacity, and disasters such as large deformation, landslides, and landslides occur; The rock mass under the stress state is prone to disasters such as large deformation of soft rocks. At the same...

AI Technical Summary

Problems solved by technology

The Chinese patent No. 201710556137.9 discloses a squeeze-friction constant-resistance yielding large-deformation bolt, which provides constant resistance to the extrusion friction of the casing through steel balls, but the contact between the steel ball and the casing is a point-line contact. The contact area is small, so the constant resistance generated is small, and the steel ball is not an integral component. When a single or multiple steel balls are damaged, it will cause uneven force on the rod body, damage the working performance of the anchor rod, and easily cause instability and damage.

[0004] In short, the existing conventional bolts have low elongation and poor impact resistance, which is difficult to meet the engineering requirements, and the existing large deformation energy-absorbing bolts are unstable in constant resistance or prone to structural instability due to their respective principles and structural defects. , the effect is not ideal

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