Abdicating buffer energy-absorbing shock-proof anchor rod cable for coal mine

Abstract

The invention provides an abdicating buffer energy-absorbing shock-proof anchor rod cable for a coal mine and belongs to the technical field of coal mine support safety. The anchor rod cable provided by the invention comprises pre-tightening nuts, a tray, an abdicating buffer energy-absorbing device, a backing plate, a slurry stop plug, a high-strength twisted steel anchor rod, an abdicating joint sleeve, a stranded wire anchor cable and a anchor cable cap, wherein the abdication jointing sleeve comprises an anchor cable joint sleeve, an anchor rod joint sleeve, a wedge-shaped cushion block, a anchor cable end part stripping-prevention protective sleeve, a rubber sleeve and an installation nut, the abdication buffer energy-absorbing device is of a thin wall tubular structure with folding grains and comprises an outer cylinder and a locating sleeve; the slurry stop plug, the backing plate, the abdication buffer energy-absorbing device and the tray are sequentially sleeved on the front end of the rod body of the high-strength twisted steel anchor rod and are fastened by virtue of the pretensioning nuts; the anchor cable joint sleeve and the anchor rod joint sleeve are connected through threads; the anchor rod joint sleeve is sleeved at the tail end of the high-strength twisted steel anchor rod and is connected with the stranded wire anchor cable by virtue of the wedge-shaped cushion block.

Description

technical field [0001] The invention belongs to the technical field of coal mine support safety, and in particular relates to an energy-absorbing energy-absorbing and anti-shock anchor cable for coal mines. Background technique [0002] When coal enters deep mining, the roadway will show significant large deformation characteristics under high ground pressure environment, especially in the coal seam roadway with impact risk, a large amount of elastic compression energy will be released at the moment of rock burst, which is likely to make the bolt And the anchor cable is suddenly pulled off, causing the roof of the roadway to sink rapidly, and the bottom plate of the roadway to bulge rapidly, and even cause the entire roadway to be closed, eventually causing serious casualties and equipment property losses. How to ensure the stability of surrounding rock support in impact dangerous roadways has become a major problem to be solved urgently. [0003] For impact dangerous roadw...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the anchor cables with the function of giving way use pressure relief trays or compressible liners, compression rings and pressure springs, etc., such as a pressure anchor cable disclosed in Chinese patent No. 200820037459.9, and An active self-adaptive constant-resistance extender for prestressed anchor cables is disclosed in the Chinese patent application number 201120059647.3. These anchor cables solve the problem of roadway surrounding rock stability under static loads to a certain extent, but when encountering When impacting dangerous roadways with instantaneous large deformation, these anchor cables have the disadvantages of limited adjustment deformation and cannot withstand large deformation, and there are also problems such as insufficient pressure yielding speed and poor impact resistance.

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