Bottom beam for roadway hydraulic support high in energy absorption speed, burnt resistant and floor heave resistant

Abstract

A bottom beam for a roadway hydraulic support high in energy absorption speed, burnt resistant and floor heave resistant is characterized in that a plurality of burst energy absorption unit mounting cavities are evenly distributed in a counter-arch variable section box beam, burst energy absorption units are located in the burst energy absorption unit mounting cavities, carbon fiber cloth is located below the burst energy absorption units and is tightly attached to the bottoms of the burst energy absorption units, the end of the carbon fiber cloth is fixedly connected to the counter-arch variable section box beam, each burst energy absorption unit comprises an energy absorption block and a burst block, with the energy absorption block being located above a top board of the burst block and the top of the energy absorption block being tightly attached to the upper wall of the corresponding burst energy absorption unit mounting cavity; the sidewall of each burst energy absorption unit mounting cavity is provided with guide ribs, and side boards of the burst blocks are provided with guide grooves; the guide ribs are located in the guide grooves; the burst blocks are in sliding fit with the sidewalls of the burst energy absorption unit mounting cavities; the energy absorption blocks are made of metal thin-walled tubes filled with porous foam alloy material; the upper and lower end faces of each energy absorption block are planes parallel to each other; the upper end face of the top board of each burst block is planar; the lower end face of the bottom board of each burst block is arced.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety support, and in particular relates to a roadway hydraulic support bottom beam for fast energy absorption, impact resistance and bottom sag. Background technique [0002] Sudden rock bursts during coal mining often lead to instability of the surrounding rock structure of the roadway, such as roadway roof caving, slabs, and bottom sills, etc., which lead to deformation or even collapse of the roadway support, resulting in casualties and forced coal mining operations. Stop, bring bigger economic loss to coal mine. [0003] Among them, when the bottom of the roadway occurs, accompanied by the violent vibration of the floor, the rock mass suddenly breaks and instantly produces a huge impact on the overlying equipment and supporting body, often causing damage to the bottom of the support, lifting the track, and overturning the belt , narrowing of the roadway section, etc., hindering normal tra...

AI Technical Summary

Problems solved by technology

[0002] Sudden rock bursts during coal mining often lead to instability of the surrounding rock structure of the roadway, such as roadway roof caving, slabs, and bottom sills, etc., which lead to deformation or even collapse of the roadway support, resulting in casualties and forced coal mining operations. Stop, bring big economic loss to the coal mine

[0003] Among them, when the bottom of the roadway occurs, accompanied by the violent vibration of the floor, the rock mass suddenly breaks and instantly produces a huge impact on the overlying equipment and supporting body, often causing damage to the bottom of the support, lifting the track, and overturning the belt , narrowing of the roadway section, etc., hindering normal transportation and passage, so a lot of manpower and material resources have to be invested in temporary treatment such as "bottom digging"

In severe cases, the entire roadway will be scrapped, seriously restricting the normal production and operation of the coal mine

[0004] At present, some mines have introduced some new roadway hydraulic supports, aiming to defend the roadway rock burst through high-strength support, but the resulting effect is: because the support rigidity is too large, it does not have the ability to withstand rock bursts. The ability to buffer and let pressure can be resisted when the impact is small, but when the impact is large, the support will be damaged first at the weakest part, resulting in weakened support capacity of the support, and even the risk of instability and damage

Taking an existing portal roadway hydraulic support as an example, this support structure is composed of a high-strength box-shaped bottom beam, a top beam and two hydraulic props. Stress concentration occurs at the joints, which will cause the bottom beam to bulge upwards, bend, and some will break completely, resulting in serious damage

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