Title:
FREEZING CROSS-CUT COAL CUTTING METHOD BASED ON HYDRAULIC SEAM-CUTTING
Document Type and Number:
WIPO Patent Application WO/2016/019826
Kind Code:
A1
Abstract:
A freezing cross-cut coal cutting method based on hydraulic seam-cutting, comprising: constructing a plurality of water injection holes (5) on a coal cutting working surface (2) at a position where the minimum normal distance between the coal cutting working surface (2) and a coal layer (1) is greater than or equal to 7 m; employing a conventional hydraulic seam-cutting technique to perform hydraulic seam cutting on the water injection holes (5); after finishing the seam cutting, connecting the water injection holes (5) to a gas extraction pipe network and performing gas extraction; when the gas content of the coal layer is less than 8 m3/t, stopping the extraction; respectively constructing a freezing hole (7) and a temperature measuring hole (6) at two sides of the water injection hole (5); employing a capsule hole sealer (12) to seal a hole; injecting water into the coal layer (1) via the water injection hole (5), and closing a valve after finishing water injection; the water injected into the coal layer gradually seeps into a microfissure of a coal body; and employing a conventional freezing technique to freeze the coal layer around the water injection hole (5), free water in a fissure of the coal layer being gradually converted from a liquid state to a solid state in the freezing process, thereby improving the strength and anti-impact capability of the coal body, solidifying the coal layer, and enabling cutting of the coal layer according to a conventional coal cutting method.
Inventors:
ZHAI CHENG (CN)
LIN BAIQUAN (CN)
YU XU (CN)
PENG SHEN (CN)
XIANG XIANWEI (CN)
XU JIZHAO (CN)
NI GUANHUA (CN)
LI QUANGUI (CN)
YANG WEI (CN)
XU YANMING (CN)
TANG ZONGQING (CN)
WU SHILIANG (CN)
ZHONG CHAO (CN)
LIN BAIQUAN (CN)
YU XU (CN)
PENG SHEN (CN)
XIANG XIANWEI (CN)
XU JIZHAO (CN)
NI GUANHUA (CN)
LI QUANGUI (CN)
YANG WEI (CN)
XU YANMING (CN)
TANG ZONGQING (CN)
WU SHILIANG (CN)
ZHONG CHAO (CN)
Application Number:
PCT/CN2015/085654
Publication Date:
February 11, 2016
Filing Date:
July 31, 2015
Export Citation:
Assignee:
ZHAI CHENG (CN)
International Classes:
E21C45/00; E21F7/00
Foreign References:
| CN104213921A | 2014-12-17 | |||
| CN103510958A | 2014-01-15 | |||
| US3900226A | 1975-08-19 | |||
| CN102409997A | 2012-04-11 | |||
| CN102536243A | 2012-07-04 |
Attorney, Agent or Firm:
NANJING RUIHONG PATENT AND TRADEMARK OFFICE (GENERAL PARTNERSHIP) (CN)
南京瑞弘专利商标事务所（普通合伙） (CN)
南京瑞弘专利商标事务所（普通合伙） (CN)
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