High-strength concrete-filled steel tube strut for coal mining and use method of strut

Abstract

The invention discloses a high-strength concrete-filled steel tube strut for coal mining and a use method of the strut. The strut comprises an upper steel tube column and a lower steel tube column connected and communicated with each other. A grouting hole is arranged in the side wall of the lower steel tube column, and a unidirectional grouting stop valve is installed at the grouting hole. The unidirectional grouting stop valve is in communication with the lower steel tube column through the grouting hole. Concrete is injected into the inner cavity of the lower steel tube column through the unidirectional grouting stop valve via the grouting hole. The concrete is continuously injected from the unidirectional grouting stop valve, and the concrete rises from the lower steel tube column until the concrete fills the inner cavity of the upper steel tube column. The invention utilizes the confinement of the steel tube columns to the concrete, improves the stress condition of the concrete, improves the strength of the concrete, further solves a problem that a common individual hydraulic strut is easy to bend and break after being subjected to relatively large pressure due to low bearingcapacity in the prior art, and can meet requirement for high supporting pressure.

Description

technical field [0001] The invention relates to the field of coal mine mining, in particular to a high-strength steel pipe concrete pillar for coal mine mining and a use method thereof. Background technique [0002] In recent years, with the increasing mining depth of my country's coal mines, the mine pressure of deep mine roadways has gradually become prominent. Due to the low bearing capacity of the single hydraulic prop, it is easy to bend and break after being subjected to a large pressure, and it is difficult to meet the requirements of high support pressure. Contents of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a high-strength steel pipe concrete pillar for coal mine development and its use method. By pouring concrete into the steel pipe pillar, the concrete is restrained by the steel pipe pillar to improve the concrete. The strength condition of concrete is improved, and the problem of low bearing...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a high-strength steel pipe concrete pillar for coal mine development and its use method. By pouring concrete into the steel pipe pillar, the concrete is restrained by the steel pipe pillar to improve the concrete. The strength of the concrete is improved, and the problem of low bearing capacity of the common single hydraulic prop in the prior art is solved, and the requirement of high support pressure can be realized

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