Energy-absorbing anti-shock backboard of a bracket

Abstract

The invention discloses an energy absorbing and impact resisting back plate of a support, and belongs to the technical field of supporting of coal mine tunnels. The energy absorbing and impact resisting back plate of the support is mainly applied to a U-shaped steel support in a recovery tunnel of a deep rock burst mine, has the advantages of high strength, corrosion resistance and the like, and can quickly give way and absorb energy under the condition of dynamic load. The energy absorbing and impact resisting back plate comprises a left-upper base plate, a right-upper baseplate, a left energy absorbing column, a right energy absorbing column, a left-lower base plate, a right-lower base plate, a left air pressure anti-impact cylinder, a right air pressure anti-impact cylinder, a left fastening ring, a right fastening ring, a connecting rod and an energy-absorbing connection beam. The left-upper base plate and the right-upper base plate are connected through the connecting rod. The energy absorbing columns are arranged at the bottoms of the upper base plates. Each energy absorbing column is composed of a taper sleeve, an expansion ring and a guide column. The air pressure anti-impact cylinders are arranged at the bottoms of the guide columns. Each air pressure anti-impact cylinder is composed of a cylinder body, a piston, an air injection valve ad a safety valve. The pistons are connected with the guide columns. The lower base plates are arranged at the bottoms of the cylinder bodies of the air pressure anti-impact cylinders. The fastening rings are arranged at the bottoms of the lower base plates. The energy-absorbing connection beam is composed of a foldable energy-absorbing steel cylinder and connecting pieces.

Description

technical field [0001] The invention belongs to the technical field of coal mine roadway support, and in particular relates to an energy-absorbing and anti-scour back plate of a bracket, which is mainly applied to U-shaped steel brackets in mining roadways of deep rockburst mines. Background technique [0002] With the increase of energy demand in our country and the decrease of recoverable reserves in shallow coal mines year by year, the mining depth of mines is getting deeper and deeper. At present, some mines in my country have mining depths exceeding 1,000 meters. In the next few years, more mines will enter deep mining. stage. The deep mining of the mine is in a complex mechanical environment of "four highs and one disturbance". The frequency of impact-type dynamic disasters is increasing, and the degree of damage is also becoming more intense, resulting in a large number of roadway support damage, collapse and casualties, which seriously affects the safety of coal mine ...

AI Technical Summary

Problems solved by technology

This requires that the support structure composed of U-shaped steel brackets can not only bear the strong static load of the surrounding rock, but also withstand the high-speed and strong dynamic loads caused by impact rock pressure. It is poor, and the lap connection method it adopts cannot achieve rapid contraction and pressure relief, so it is difficult to quickly give way to pressure relief, and it cannot absorb the energy released during the impact of ground pressure in time, so it is difficult to effectively resist ground impact. High dynamic load generated by pressure

In order to protect the U-shaped steel bracket, a backboard is installed on the top of the U-shaped steel bracket. However, the existing backboard cannot effectively transmit the load of the roadway surrounding rock due to its low strength, loose contact with the surrounding rock of the roadway, and perishability. The U-shaped steel support is unevenly stressed, and concentrated loads and eccentric loads appear locally, resulting in poor interaction between the U-shaped steel support and the surrounding rock of the roadway, which makes the overall bearing capacity of the U-shaped steel support structure lower, resulting in deformation and destruction of the U-shaped steel support.

Images