Roadway U-shaped steel sleeving shed supporting structure

Abstract

The invention discloses a roadway U-shaped steel sleeving shed supporting structure. The supporting method that anchor cables and a metal net are arranged, mortar spraying is conducted, a U-shaped steel sleeving shed is arranged, and grouting is conducted is adopted; firstly, an anchor net spraying layer is formed, the anchor net spraying layer has the effect of preventing surrounding rock from further weathering and deliquescing, the loads on the two sides and a roof of a roadway evenly act on supports so as to avoid stress concentration, thus, rapid press-deformation and roof caving which are caused by crushing of the surrounding rock at the initial excavation period of the roadway can be controlled effectively, and finally an anchor net spraying combination isolation arch on the surfaceof the roadway is formed; secondly, a supporting rigid layer is formed between every two layers of U-shaped steel; the roadway U-shaped steel sleeving shed supporting structure can be resistant to compression with high strength and can conduct yielding moderately, and a hardness and softness double-layer supporting structure is formed; and the stability and supporting strength of the surroundingrock of the crushed soft rock roadway are promoted greatly, a certain guarantee is provided for safe production of a coal mine, meanwhile, a certain amount of roadway maintenance cost is also reducedfor an enterprise, great benefits are achieved for development of the coal enterprise, and thus the roadway U-shaped steel sleeving shed supporting structure can be used and popularized on a large scale.

Description

technical field [0001] The invention belongs to the technical field of roadway surrounding rock support in mining engineering, and relates to a roadway shed support structure. Background technique [0002] Studies have shown that the status of coal as the main energy source in my country will not change fundamentally for a long period of time in the future. With the depletion of shallow coal resources, the mining depth and mining intensity of coal mines continue to increase. The severe degree of mine pressure in soft rock roadway shows serious deformation and damage of soft rock roadway. The deep rock mass is in a complex mechanical environment of "three highs and one disturbance", which makes the surrounding rock stability of deep soft rock roadways in coal mines affected by multiple factors, and the problem of surrounding rock control is becoming increasingly prominent. Soft rock roadway support is still an important and complicated technical problem in mining and underg...

AI Technical Summary

Problems solved by technology

Both of the above two patents provide methods for controlling the surrounding rocks of relatively broken and soft rock roadways in the deep part, but the former does not carry out anchor net spraying after digging roadways, but directly drills bolt holes for bolt support, which is first of all An anchor cable extrusion reinforcement arch is not formed, which will lead to weak support strength and weak surface protection ability, and secondly, this will further weather and deliquesce the surrounding rock, so that the loads of the two sides of the roadway and the roof cannot be evenly acted on the support As a result, the phenomenon of stress concentration occurs, so that the rapid deformation of the surrounding rock and the collapse of the roof at the initial stage of roadway excavation cannot be effectively controlled, and finally the damage of the roadway is accelerated and the ideal effect cannot be achieved; the latter is not used. U-shaped steel is used for reinforcement and support, which will lead to a short maintenance time of the roadway, which will increase the maintenance cost of the roadway and generate unnecessary economic expenses.

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