A concrete-filled steel tube roadside support system and support method for large-section gob-side entry retention

Abstract

The invention provides a concrete filled steel tube roadside support system used for large-section gob-side entry retaining and a support method thereof. The system comprises Pi-type steel beams which are closely clung to a top plate, concrete filled steel tube stand columns which support the Pi-type steel beams of the top plate, elliptical ring bases which sleeve the lower parts of the concrete filled steel tube stand columns, and inclined hydraulic jacks with the elliptical ring bases acting as hinged pivots, wherein the end heads of the inclined hydraulic jacks support the Pi-type steel beams and metal meshes of the surface of the filling wall. A truss structure formed by the concrete filled steel tube stand columns has the main support effect on the top plate and controls subsidence and deformation of the top plate in cooperation with the filling wall. Moderate underframe sinking and pressure releasing can be performed by the concrete filled steel tube stand columns in the process so that stability of the concrete filled steel tube stand columns in a vertical direction can be increased, and then the hydraulic jacks, which are arranged in an inclined way with the elliptical ring bases acting as the hinged pivots, can provide relatively high acting force to support the Pi-type steel beams and the metal meshes of the surface of the filling wall.

Description

technical field [0001] The invention belongs to the technical field of coal mine roadway support, and in particular relates to a steel pipe concrete roadside support system and a support method for large-section gob-side entry retention. Background technique [0002] Gobside retaining refers to retaining the mining roadway behind the mined working face along the edge of the goaf in a certain way, as the mining roadway of the next working face. The gob-side retaining can not only cancel the section protection coal pillars, improve the recovery rate of coal resources, and relieve the tension of mining replacement, but also realize the "Y" ventilation of the working face, fundamentally solve the problem of gas over-limit and the upper corner of the upper working face. Corner Gas Accumulation Conundrum. So far, my country has done a lot of work on the theory and technology research of gob-side entry retention. The technology of gob-side entry retention in the thin and medium-th...

AI Technical Summary

Problems solved by technology

Even if the way of erecting wooden point columns and single hydraulic props in the roadway cannot effectively prevent large-area fracturing chips on the side of the filling wall beside the roadway, the wooden point columns are split or broken, and the single hydraulic props are seriously bent and deformed, which leads to The load-carrying capacity of the filling wall at the side of the roadway is reduced, and it is easy to induce the damage and instability of the roadside support structure, so that some mines do not achieve the expected effect when applying the technology of large-section gob-side entry retention, or even fail to retain the entryway, thus limiting the gob-side entry retention Technology is more widely promoted and applied in our country

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