A pressure-relieving device for accurate construction and monitoring of the pre-tightening force of roadway bolts and its application method

A technology of pretightening force and anchor rod, which is applied in the direction of measuring device, installation of anchor rod, force/torque/work measuring instrument, etc., and can solve the problem of large gap in pretightening force, relationship between pretightening force of anchor rod and pretightening torque of nut Complicated, large errors in the conversion process, etc., to achieve better deformation of surrounding rock, avoid instability accidents, and improve safety and reliability

Active Publication Date: 2019-07-19
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the coal mine roadway, the main method of applying the pre-tightening force of the bolt is to generate the pre-tightening torque by tightening the nut, and determine the magnitude of the applied pre-tightening force through the conversion relationship between the nut pre-tightening torque and the pre-tightening force, but the pre-tightening force of the bolt The relationship between the nut pretightening torque and the nut pretightening torque is more complicated. Affected by many factors, the error in the conversion process is relatively large; in the process of applying the pretightening force, workers often operate by experience, and the applied value of the actual pretightening force is consistent with the design Preload values ​​vary widely

Method used

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  • A pressure-relieving device for accurate construction and monitoring of the pre-tightening force of roadway bolts and its application method
  • A pressure-relieving device for accurate construction and monitoring of the pre-tightening force of roadway bolts and its application method
  • A pressure-relieving device for accurate construction and monitoring of the pre-tightening force of roadway bolts and its application method

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Embodiment Construction

[0022] An implementation example of the present invention will be further described below in conjunction with accompanying drawing:

[0023] Such as figure 1 , figure 2 with image 3 As shown, the pressure-relieving device for accurate construction and monitoring of the pre-tightening force of the roadway anchor rod of the present invention is arranged between the tray 7 and the nut 8 at the end of the anchor rod 9, and is characterized in that it includes a piston rod 1 and a Cylinder 2, the inner diameter of the cylinder 2 and the diameter of the anchor rod are matched in engineering with a difference of 2mm, and the corresponding anchor rod diameter is 16-25mm; the middle of the piston rod 1 and the cylinder 2 is provided with a through hole matching the tail of the anchor rod 9, Piston rod 1 and cylinder 2 have a ring-shaped cylindrical structure in cross-section. Cylinder cavity 3 is provided inside cylinder 2. Cylinder cavity 3 is filled with nitrogen. , the inner di...

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Abstract

The invention discloses a yielding device for accurate application and monitoring of a pretightening force of a roadway bolt and a use method and belongs to the technical field of mine roadway support. The yielding device comprises a piston rod and an air cylinder which are mutually connected, wherein a through hole matched with the tail of an anchor bolt is formed between the piston rod and the air cylinder; the sections of the piston rod and the air cylinder are of annular cylindrical structures; an air cylinder cavity is formed inside the air cylinder; the air cylinder cavity is filled withnitrogen; an air piston matched with the inner diameter of the cavity is arranged on the piston rod; an air hole communicated with the air cylinder cavity inside the air cylinder is formed in the side wall of the air cylinder; an inflation valve is arranged on the air hole; two annular sealing grooves are formed in the inner wall, in contact with the piston rod, of the air cylinder; anti-foulingscraping rings and sealing gaskets are respectively arranged in the annular sealing grooves. The yielding device is simple in structure and convenient to use and can be well matched with an existinganchor bolt; the yield device for accurate application and monitoring of the pretightening force of the roadway bolt and the use method have the advantages that the pretightening force can be monitored in real time and accurately applied; working conditions of the anchor bolt are judged, and the safety and the reliability of anchor bolt support are effectively improved.

Description

technical field [0001] The invention relates to a pressure relief device for precise construction and monitoring of the pretightening force of roadway bolts and a method for using it, belonging to the technical field of mine roadway support. Background technique [0002] At present, coal mine roadway support at home and abroad mainly adopts the bolt support method. According to statistics, the bolt support rate in the United States, Australia and other developed western countries has reached more than 90%, and the bolt support rate in most mining areas in my country has also reached 80%. % or even higher. One of the key parameters in bolt support is the pre-tightening force. The pre-tightening force of the bolt can change the bolt support from passive support to active support, so that the bolt and the anchored rock mass form a unified load-bearing structure. , which plays a decisive role in the bolt support effect, and the precise application of the bolt preload can realize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00E21D21/02E21D20/00E21D20/02G01L5/00
CPCE21D20/00E21D20/02E21D21/00E21D21/02G01L5/00
Inventor 郑西贵安铁梁王文凯马昂朱登兴
Owner CHINA UNIV OF MINING & TECH
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