An active support type yielding pressure bearing pillar and its use method
A supportive and active technology, used in pillars/supports, earth-moving drilling, mining equipment, etc., to achieve the effect of enhancing bearing capacity and reducing support costs
Active Publication Date: 2022-06-24
NORTHEASTERN UNIV LIAONING
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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 with reference to the accompanying drawings and embodiments.
[0033] In this embodiment, a metal mine uses the present invention to mine the original rock pillars in the stope.
[0034] The metal ore is a gently sloping thin vein with moderately stable ore rocks. The average thickness of the ore body is 3m, and the dip angle of the ore body is 5-15°. The traditional room and pillar method is used to mine the ore body, resulting in relatively large economic losses. In order to improve the recovery rate of ore, the active support type pressure bearing pillars of the present invention are used to replace the original rock pillars left in the stope.
[0035] combine figure 1 , figure 2 and image 3 , the active support force of the prestressing device 9 of the actively supported pressure bearing strut is 1700KN; the inner supporting steel pipe 2 and the outer restraining steel pipe 3 are installed concentrically and...
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An actively supported pressure-bearing pillar and its use method, including a prestressing device, an inner supporting steel pipe installed on the top plate of the prestressing device, an outer restraining steel pipe and a roofing steel plate; wherein the outer restraining steel pipe is composed of two semicircular It is composed of butt joints of shaped tubes, and there is a cut rubber pad on the inner wall of the upper end. The use method includes prefabricating components; placing the prestressing device on the floor rock mass at the support position; welding the inner support steel pipe on the top plate of the prestressing device; Water is injected into the prestressing device to expand the expansive material, which is transformed into an active support between the top plate and the bottom plate. The pillar can maintain a constant ultimate bearing capacity after the large deformation of the inner supporting steel pipe, realizing long-term "yielding pressure support"; when the compression deformation of the inner supporting steel pipe is the same as the height of the outer restraining steel pipe, it is jointly carried by the inner supporting steel pipe and the outer restraining steel pipe, The bearing capacity is increased; the outer restraint steel pipe can be recycled and reused.
Description
technical field [0001] The invention relates to underground support in metal mines, in particular to an active support type pressure-bearing support pillar and a method for using the same. Background technique [0002] When the metal mine enters the deep high-stress mining, the ground pressure disasters such as the spalling of the stope sidewall and the large-scale collapse of the roof seriously threaten the safety of personnel and equipment. Although the original rock pillar can improve the safety of the stope, it is extremely prone to brittle splitting under uniaxial loading conditions, and the retention of the original rock pillar causes serious loss of ore resources. In order to improve the recovery rate of ore and ensure the stability of pillars, artificial pillars with low cost and excellent performance have become the research topic of more and more scholars. [0003] Many different types of artificial ore pillars currently used have shortcomings such as low active s...
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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 LIAONING