A U-shaped steel support and a method for controlling roadway surrounding rock by graded active loading

Abstract

The invention provides a U-shaped steel bracket and a method for controlling roadway surrounding rock by graded active loading. The U-shaped steel bracket: two shed legs are connected to the two ends of the beam through connecting pieces, and the arc-shaped horizontal brace is arranged at the lower part of the beam. The cable plate and the lower clamping cable plate are respectively arranged above the cross beam and below the arc cross brace, and are connected by two lengthened cross braces loaded with bolt rods; the method of controlling the surrounding rock of the roadway: laying trapezoidal U-shaped steel brackets; installing arc cross braces support; connect arc-shaped cross braces and beams; carry out active loading of support force; provide comprehensive support for the roadway. The support has the function of active support, the overall rigidity is strong, and the support force can be adjusted reasonably according to the pressure and deformation of the surrounding rock, which can effectively improve the support strength; this method can provide a support method with hierarchical active loading, which can effectively realize U The passive loading mode of the section steel support is an active loading mode, which can form an effective support for the roadway and can effectively improve the safety production work of the coal mine.

Description

technical field [0001] The invention belongs to the technical field of coal mine support, and in particular relates to a U-shaped steel support and a method for controlling roadway surrounding rock by graded active loading. Background technique [0002] With the increase of coal mine mining depth, the difficulty of supporting is also increasing. Under the action of high ground stress, the surrounding rock of the deep roadway is seriously broken and the deformation is large, resulting in high maintenance cost and short service life of the roadway, which increases the The difficulty of construction has seriously affected the safety production of coal mines. The U-shaped steel bracket is a passive support with high tensile strength and compressive strength and good toughness. [0003] At present, the U-shaped steel support method is more common. The ability of the traditional U-shaped steel support to withstand the lateral pressure is weaker than that of the top pressure. The ...

AI Technical Summary

Problems solved by technology

Only when the surrounding rock undergoes a certain deformation and produces sufficient bearing capacity, this support system can bear the load. It cannot actively control the deformation of the surrounding rock and belongs to the passive support form; 2. The commonly used U-shaped steel support can only bear the force passively , it is impossible to reasonably adjust the supporting force according to the pressure and deformation of the surrounding rock, improve the supporting strength, and effectively control the development of deformation. It can only allow the surrounding rock to creep, resulting in accumulated large deformation, resulting in the reduction of the roadway section and affecting the use function; 3. Under the influence of high ground stress, the trapezoidal U-shaped steel bracket is often twisted due to insufficient overall rigidity, resulting in certain damage. The shed leg section is often bent and deformed due to local insufficient rigidity, and the U-shaped steel connection section often shrinks, resulting in damage to the bracket.

When the traditional U-shaped steel support is subjected to concentrated mine pressure, it is easy to cause the support to be crushed, local instability occurs, and the support effect of the roadway is affected. The replacement is also very dangerous. Therefore, there is an urgent need for a graded active loading The support for effective support

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