All hole depth different-diameter hole protecting and hole sealing system and method for deep-buried soft coal seam
The invention provides an all hole depth different-diameter hole protecting and hole sealing system and method for a deep-buried soft coal seam. The system involves a small floral tube hole protectingsection, a large floral tube hole protecting section and a hole sealing section which are sequential...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention provides an all hole depth different-diameter hole protecting and hole sealing system and method for a deep-buried soft coal seam. The system involves a small floral tube hole protectingsection, a large floral tube hole protecting section and a hole sealing section which are sequentially arranged form a hole bottom part to a hole opening of a drilled hole, wherein the small floral tube hole protecting section is provided with a plurality of small floral tubes which are sequentially connected, the large floral tube hole protecting section is provided with a plurality of large floral tubes which are sequentially connected, the tube diameter of the small floral tubes is smaller than the tube diameter of the large floral tubes, and the end parts of the small floral tubes adjacent to the large floral tubes are arranged in the large floral tubes; and the hole sealing section comprises a plurality of short connecting tubes which are sequentially connected, the end parts of every adjacent short connecti |
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