Mining anti-impact double-column combined pier column structure, supporting system and construction method

Abstract

The invention relates to a mining anti-impact double-column combined pier column structure. The mining anti-impact double-column combined pier column structure comprises a shoe plate, a top supporting plate and two pier columns, wherein the two pier columns share the top supporting plate and the shoe plate and are integrally fixed to achieve rigid connection; each pier column comprises a supporting body and at least one yielding steel pipe; the pipe diameters of the yielding steel pipes are different, and the different yielding steel pipes are arranged in a sleeving mode; the tops of the yielding steel pipes are fixedly connected with the top supporting plate, and the bottoms of the yielding steel pipes are slidably inserted into cavities in the supporting bodies; and the supporting bodies and the yielding steel pipes are combined to form the pier column structure, and the two columns are supported between a roadway roof and a bottom plate in parallel. The invention further relates to a supporting system and a construction method. The mining anti-impact double-column combined pier column structure is simple in structure and high in bearing capacity, the bearing capacity of the pier columns can be kept not to be reduced, rapid constant-resistance shrinkage can be achieved, impact energy is absorbed, and the safety of personnel and equipment in a roadway space is protected.

Description

technical field [0001] The invention belongs to the field of anti-scour support for coal mine roadways, and in particular relates to a mining anti-scour double-column combined pier structure, a support system and a construction method. Background technique [0002] Rock burst is a phenomenon of sudden failure of the adjacent rock mass in the process of deep mining. When rock burst occurs, a large amount of impact energy will be released in the rock mass. As the depth and intensity of coal mining continue to increase, the impact The occurrence frequency and damage degree of ground pressure are also becoming more and more intense, which is one of the main safety hazards faced by deep mines. In the actual roadway, high-strength support is often used to ensure the safety of the roadway, such as bolt (cable) support, U-shaped steel support and body hydraulic pier support, etc., are all carried out under quasi-static mine pressure It is designed, and its ability to withstand stat...

AI Technical Summary

Problems solved by technology

In the actual roadway, high-strength support is often used to ensure the safety of the roadway, such as anchor (cable) support, U-shaped steel support and body hydraulic pier support, etc., are all carried out under quasi-static mine pressure It is designed, and its ability to withstand static loads is relatively strong, but under the action of impact loads, it cannot withstand the huge impact of the energy carried by sudden impact rock pressure on the support system, often due to sudden damage to some support bodies It leads to the impact instability and destruction of the entire support system. Although the advanced hydraulic support has a high protection ability, the use of hydraulic piers also has a certain ability to give way, but its own weight is large, the speed of giving way is slow, and it does not absorb the impact. The ability of energy often causes the hydraulic support to be severely bent and deformed, or even destroyed

[0003] Compared with the existing patent CN106285738A, the constant group variable pressure is realized by releasing the emulsion, but it is difficult to release the pressure in time when faced with the impact of rock pressure, and the release time of the emulsion is much longer than the impact time of the rock impact, so it cannot absorb the impact energy

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