A bolt support device and method for deforming an energy-absorbing anchor ring and preventing bolt fracture and ejection

Abstract

Disclosed is an anchor rod supporting method applying a deforming energy-absorbing anchor ring for preventing an anchor rod from being broken and ejected, particularly suitable for soft rock large-deformation roadways or sections requiring energy-absorbing yielding supporting. According to the method, the anchor rod (1) penetrates through the anchor ring (2) having opposite holes, and by applying pressure to rock mass (10) by means of a tray (6) and a nut (4), deformation is prevented. When the stress of the anchor rod is increased, the anchor ring deforms in a direction along the opposite holes, and thus the energy-absorbing effect is achieved. The deformation amplitude of the anchor ring can be observed by utilizing fluorescent bands (3) oppositely disposed on the outer sides of the anchor ring, so that the stress of the anchor rod is pre-determined, and a warning effect on sudden breakage of a potential part is achieved. When the deformation of the anchor ring is too large or the fluorescence range is too large, anti-ejection iron wires (11) penetrate through two holes (5) which are formed at the tail portion of the anchor rod in a crossed mode, and are screwed and fixed on an iron wire net (7). If the anchor rod is broken at any key position, the two anti-ejection iron wires which are disposed in the crossed mode can prevent the anchor rod from being ejected into the space of the roadway, and people are prevented from being injured. Also disclosed is an anchor rod supporting apparatus applying a deforming energy-absorbing anchor ring for preventing an anchor rod from being broken and ejected, which is simple in structure, convenient to operate, low in economic costs, safe, reliable and good in effect.

Description

technical field [0001] The invention relates to a bolt support device and method, in particular to a deformed energy-absorbing anchor ring suitable for soft rock large-deformation roadways or sections requiring pressure-absorbing and pressure-absorbing support to protect the safety of miners and prevent bolt breakage Ejection bolt support device and method. Background technique [0002] Bolt support technology plays an extremely important role in the field of coal mine support in my country, and has obvious economic and technical benefits, so it is widely popularized and applied. In recent years, with the increase of coal mining depth, many mines can encounter large deformation roadways in soft rock or roadways with impact tendencies such as rockbursts. Such roadways have high original rock stress and complex stress disturbances, and most roadways have to withstand a Or multiple mining disturbances. At present, most projects tend to use intensive support, extended support,...

AI Technical Summary

Problems solved by technology

Some coal mines use the method of "capping" or "wrapping iron wire" on the tail of the bolt to prevent potential fracture ejection, which is blind and unpredictable

If all bolting systems are adopted in this way, some bolting systems will not actually eject in the end during the normal service of the roadway, which will cause long operation time and slow down the excavation speed.

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