A device for measuring expansion and deformation of remote protected layer

Abstract

The invention discloses a swelling distortion magnitude measuring device for a long-distance protected coal seam. The swelling distortion magnitude measuring device comprises a coal seam roof base point fixator, a roof base point measuring line, a connecting pipe, a coal seam floor base point fixator, a floor base point measuring line, a protective casing pipe and a casing pipe connector. The coal seam roof base point fixator and the coal seam floor base point fixator are identical in structure. Wings around a pipe body are in an opening state, and the two wings are connected through the connecting pipe in an inserted mode. The lower portion of the coal seam floor base point fixator is connected with the protective casing pipe through the casing pipe connector. One end of the roof base point measuring line is fixed to the interior of the coal seam roof base point fixator, and the other end of the roof base point measuring line is led out after passing through the connecting pipe and the coal seam floor base point fixator; one end of the floor base point measuring line is fixed to the interior of the coal seam floor base point fixator, and the other end of the floor base point measuring line is led out from the protective casing pipe. The swelling distortion magnitude measuring device is simple, portable and capable of being installed at a time; in addition, base points are firm in fixation, and the swelling distortion magnitude measuring device is high in adaptability to drilling and especially suitable for measurement of the swelling distortion magnitude of long-distance protected coal seams.

Description

technical field [0001] The invention relates to a device for measuring expansion and deformation of a long-distance protected layer, which is especially suitable for measuring the expansion and deformation of the protected layer in the investigation of the mining effect of the long-distance underground protective layer. Background technique [0002] Protective layer mining is of great significance in the control of coal mine gas, especially in the prevention and control of coal and gas outburst disasters. According to the requirements of the "Regulations on the Prevention and Control of Coal and Gas Outbursts", the mining of protective layers is a preferred regional prevention and control measure. When an outburst mine has the conditions for mining of protective layers, the protective layer must be mined first. [0003] The expansion and deformation of coal seam is an important index to measure the mining effect of protective seam. At present, the deep base point method is ...

AI Technical Summary

Problems solved by technology

[0004] The traditional measurement method is difficult in actual operation and has potential safety hazards

The steel wedge is bulky, and it is easy to collide with the hole wall during the pushing process, causing misalignment, or even getting stuck in the middle of the drilling hole, resulting in installation failure; the steel wedge and steel bars are first pushed to the roof of the coal seam for fixation, and then the steel wedge and steel pipe are pushed When the bottom plate is fixed, the installation cannot be completed at one time. The installation of the base point of the bottom plate will affect the stability of the base point of the top plate; The steel pipe is prone to fall under the action of its own weight, which poses a safety hazard; if a steel wire rope is used instead of steel bars and steel pipes, it will be difficult to install and fix the steel wedge at the base point, and the steel wire rope used for measurement is lack of protection, and may be stuck in the crack of the hole wall, resulting in inaccurate measurement

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