High-strength energy-absorbing anchor rod with good extensive quantity

Abstract

The invention provides a high-strength energy-absorbing anchor rod with a good extensive quantity and belongs to the technical field of mine engineering. A rod body of the anchor rod is composed of an energy-absorbing bent rod body, the other end of the energy-absorbing bent rod body is provided with a screw-thread section, and a fastening nut is rotatably installed on the screw-thread section; a steel tray is installed between the fastening nut and the energy-absorbing bent rod body in a sleeving mode, a sine wave-shaped plasticity energy-absorbing bent rod body is generated through cold rolling treatment of a smooth high-strength low-carbon steel round bar, and after the anchor rod is installed, when dynamic impacting disasters, such as rock explosion, occur in a roadway or surrounding rock bodies in a chamber , while the plasticity energy-absorbing bent rod body restrictively allows the surrounding rocks to properly deform, deformation energy of the rock bodies is absorbed, concentration of energy in the surrounding rock bodies is reduced, and meanwhile, the high tension-resisting strength is achieved.

Description

technical field [0001] The invention relates to the technical field of mine engineering, in particular to a high-strength energy-absorbing bolt with good elongation. Background technique [0002] Anchor rod is a widely used supporting component, which has a history of more than 100 years. With the continuous increase of the buried depth of underground engineering, the stress of the original rock continues to increase. At this time, the surrounding rock of underground engineering often shows large deformation and dynamic impact disasters such as rockburst, roof fall and slab under high stress conditions. Bolt support not only needs to consider the strength of the support system, but also needs to consider the deformation of the surrounding rock. However, the ultimate tensile length of the anchor bolts currently used is small. When the surrounding rock of the underground engineering undergoes large damage and deformation, the anchor bolts often cannot adapt to the large defor...

AI Technical Summary

Problems solved by technology

[0003] At present, rigid bolts are often used in underground hard rock mining, and anchored with mortar or resin. This kind of bolt has high rigidity and high support strength; but it has low ductility and poor deformation capacity.

For shallow underground soft rock mines (such as coal mines with small buried depths), ductile bolts (such as pipe-slit bolts and hydraulic expansion bolts) are often used at present. It is much larger, but their bearing strength is much lower, which cannot meet the engineering support requirements under high stress, and often causes fracture damage due to excessive internal stress of the rock mass.

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