Mine hexagonal tubular anti-yielding energy-absorbing anti-shock device

Abstract

The invention belongs to coal mine safety equipment, and particularly relates to a mine hexagonal tubular resistive energy-absorption anti-impact device, which is characterized in that an anchor rod (6) penetrates through a tray (4); the lower end of the anchor rod (6) forms a wedge provided with screw threads; the tray (4) is fixed with the anchor rod (6) by virtue of a nut (5); the anchor rod (6) above the tray (4) penetrates through a hexagonal pipe (3) in the section direction; the hexagonal pipe (3) is made of thin-walled rigid metal; the anchor rod (3) above the hexagonal pipe (3) penetrates through a steel plate (2); the upper end of the anchor rod (6) is fixedly connected with a surrounding rock layer; one hexagonal tube (3) can be arranged on a support top beam (1) at equal length along the sequent direction, or a plurality of hexagonal tubes (3) can be arranged on the support top beam (1) at even distance along the sequent direction, and the steel plate (2) is arranged on the hexagonal tubes (3). By adopting the mine hexagonal tubular resistive energy-absorption anti-impact device, impact energy of surrounding rock is dissipated by plastic deformation, and the function of protecting a coal mine supporting system is realized.

Description

technical field [0001] The invention belongs to coal mine safety equipment, in particular to a mine-used hexagonal tubular anti-yielding energy-absorbing anti-shock device. Background technique [0002] With the continuous increase of mining intensity and mining depth, the effective maintenance of deep wells, deformation, dynamic pressure and their composite roadways has become one of the key issues restricting mine safety production. [0003] At present, the support methods at home and abroad mainly include anchor rods, U-shaped steel, shed-cable coordinated support, shotcrete support, and portal hydraulic supports. Bolt support is to change the mechanical state of the surrounding rock itself through the bolt inside the surrounding rock, and form an integral and stable rock belt around the roadway, and use the bolt and the surrounding rock to work together to achieve the purpose of maintaining the stability of the roadway. Bolt support is economical and practical, and is w...

AI Technical Summary

Problems solved by technology

Bolt support is economical and practical, and is widely used in coal mine engineering, but the existing design of the bolt does not achieve the anti-scour effect, and it is difficult to popularize and apply it in roadway support with impact

U-shaped steel support can provide higher supporting force, and its advantage is that when the pressure of the surrounding rock on the support reaches a certain value, the support will yield and shrink, and the result of the shrinkage will reduce the pressure of the surrounding rock on the support. , so as to avoid the damage of the bracket caused by the pressure of the surrounding rock being greater than the bearing capacity of the bracket, but the friction provided by the U-shaped steel connector cannot meet the requirements, and the working resistance can only reach 40%~60% of its bearing capacity. The support ability is not fully utilized

In addition, the U-shaped bracket is prone to uneven force, concentrated load and eccentric load locally, the bracket is twisted and deformed, the bearing capacity of the bracket is greatly reduced, and the overall instability and damage are very easy to occur when impact occurs

Shed-cable synergistic support can enhance the strength of the surrounding rock and improve the support capacity, but the variable travel is small and the anti-scour ability is poor

Shotcrete support enhances the strength of the surrounding rock and reduces and prevents the deformation of the surrounding rock, but it is not suitable for preventing rock burst

The gantry hydraulic support is supported by hydraulic props, which have high support strength and can support the overlying rock strata. The overflow valve of the hydraulic props sets the rated resistance, which not only restrains the deformation of the surrounding rock but also protects the gantry hydraulic pressure. The compression failure of the support under high stress, when the rated resistance is reached, the relief valve opens, but when the shock ground pressure occurs, the portal hydraulic support is difficult to resist the strong impact load (the process of the shock ground pressure is a few seconds to tens of seconds , the shock load to the maximum load is within a few milliseconds to tens of milliseconds, the dynamic response time of the relief valve is not enough, and the relief valve is too late to open when the shock rock occurs), and the support pillar will bend, break and Explosion, etc.

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