Active supporting type yielding bearing supporting column and using method thereof
A supportive and active technology, applied in pillars/supports, earth-moving drilling, mining equipment, etc., to reduce support costs and enhance bearing capacity
Active Publication Date: 2021-12-03
NORTHEASTERN UNIV
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Problems solved by technology
[0005] In order to overcome the defects of the artificial ore pillars disclosed in the CN109944615A patent document, the present invention provides an actively supported pressure-bearing pillar and its application method
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[0032] The present invention will be further described below in conjunction with drawings and embodiments.
[0033] This embodiment is the application of the present invention in a certain metal mine to recover the original rock ore pillar in the stope.
[0034] The metal ore belongs to the gently inclined thin vein, the ore rock is moderately stable, the average thickness of the ore body is 3m, and the inclination angle of the ore body is 5-15°. The ore body is recovered by the traditional room and pillar method, and the economic loss is relatively large. In order to improve the recovery rate of ore, the original rock ore pillar left in the stope is replaced by the active support type pressure bearing pillar of the present invention.
[0035] combine figure 1 , figure 2 and image 3 , the active support force of the prestress applying device 9 of the active support type pressure bearing pillar is 1700KN.; the inner support steel pipe 2 and the outer restraint steel pipe 3...
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The invention discloses an active supporting type yielding bearing supporting column and a using method thereof. The active supporting type yielding bearing supporting column comprises a prestress applying device, and further comprises an inner supporting steel pipe, an outer restraining steel pipe and a roof-contacted steel plate which are installed on a top plate of the prestress applying device; the outer restraining steel pipe is formed by butting two semicircular pipes; and a cutting rubber pad is arranged on the inner wall of the upper end of the outer restraining steel pipe. The using method comprises the steps of prefabricating; arranging the prestress applying device on a bottom plate rock mass at the supporting position; welding the inner supporting steel pipe to the top plate of the prestress applying device; fixedly connecting the outer restraining steel pipe with the top plate of the prestress applying device; and injecting water into the prestress applying device to enable the expansion material to be expanded and converted into active support between the top plate and the bottom plate. The supporting column can still keep constant ultimate bearing capacity after large deformation of the inner supporting steel pipe, and long-term yielding supporting is achieved; when the compression deformation of the inner supporting steel pipe is equal to the height of the outer restraining steel pipe, the inner supporting steel pipe and the outer restraining steel pipe jointly bear, and the bearing capacity is increased; and the outer restraining steel pipe can be recycled and reused.
Description
technical field [0001] The invention relates to underground support of metal mines, in particular to an active support type yielding pressure bearing pillar and a use method thereof. Background technique [0002] When metal mines enter deep and high-stress mining, ground pressure disasters such as stope wall spalling and large-scale roof collapse seriously threaten the safety of personnel and equipment. Although the original rock pillars can improve the safety of the stope, they are extremely easy to brittle split under uniaxial loading conditions, and the retention of the original rock pillars has caused serious loss of ore resources. In order to improve the recovery rate of ore and ensure the stability of pillars, artificial ore pillars with low cost and excellent performance have become the research topic of more and more scholars. [0003] Many different types of artificial pillars currently used have the disadvantages of small active support force, low bearing strength...
Claims
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IPC IPC(8): E21D15/14E21D15/54E21D15/50
CPCE21D15/14E21D15/55E21D15/50
Inventor 李坤蒙李元辉姜凯元汪昕熊志朋于鹏飞
Owner NORTHEASTERN UNIV