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1.发明申请公开(公告)号：US20200318480A1
公开(公告)日：2020-10-08
申请号：US16763426
申请日：2019-02-22
Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Inventor： Nan ZHOU , Hengfeng LIU , Meng LI , Zhongya WU , Jixiong ZHANG
Abstract: A method of recovering a room-and-pillar coal pillar by using external replacement supports. In the recovery of a room-and-pillar coal pillar, a cement material wall is formed by performing pouring around a coal pillar having a width to height ratio of less than 0.6, by means of a single-pillar sack arrangement technique, such that a coal pillar resource may be mined while a wall made from a cement filling material supports an overlying stratum. After mining is complete, a coal pillar goaf region is filled with the cement filling material, and after the cement filling material solidifies and is stable, the single pillar can be recovered.
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公开(公告)号：US20200300088A1
公开(公告)日：2020-09-24
申请号：US16088437
申请日：2017-11-02
Applicant: China University of Mining and Technology
Inventor： Qiang ZHANG , Jixiong ZHANG , Zhongya WU , Wenyue QI , Hong YAN , Meng LI
Abstract: Provided is a base mechanism of a single prop capable of being unloaded at reduced pressure, including a base bottom plate and two wedge-shaped support blocks, where one of the wedge-shaped support blocks serves as a fixed wedge-shaped support block and is welded onto the base bottom plate, and the other of the wedge-shaped support blocks serves as a movable wedge-shaped support block and is connected to the fixed wedge-shaped support block by using a screw rod and a nut. The present invention can effectively unload the single prop at reduced pressure or remove the single prop in a contracted manner, is of a simple structure, is convenient to operate, has a good use effect, overcomes the technical problem that it is difficult to unload a single prop at reduced pressure in this technical feature, and is widely applicable in this technical field.
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