Wing type splitting energy absorption anchor rod and structure for preventing rockburst and large deformation

Abstract

The invention belongs to the technical field of anchor rods, and discloses a wing type splitting energy absorption anchor rod for preventing rockburst and large deformation. The anchor rod comprises an anchor rod body, a tray, a nut and an anchoring wing, the tray and the nut are arranged at the tail part of the anchor rod body, and the anchoring wing is radially arranged on the outer wall of theanchor rod body. The invention provides the wing type splitting energy absorption anchor rod and the wing type splitting energy absorption structure for preventing rockburst and large deformation, andthe energy absorption anchor rod effectively improves the energy absorption yield and the effect on controlling the disasters of deep underground works like rockburst or large deformation.

Description

technical field [0001] The invention relates to the technical field of bolts, in particular to a rockburst-resistant and large-deformation wing splitting energy-absorbing bolt and its structure. Background technique [0002] Bolt support technology has a history of more than 100 years, and has become one of the widely used support methods for ground engineering such as rock slopes and foundation pits, as well as underground engineering such as tunnels and stopes, especially in the surrounding rock of underground engineering. More noticeable in stability control. Conventional anchors are used in shallow underground, and can be divided into mechanical anchors, bonded anchors and friction anchors according to their different stress modes. The mechanical anchor is also the expansion shell anchor. The bonded anchor has high rigidity and high strength, but has small ductility and poor deformation ability; friction anchor, pipe seam type, and hydraulic expansion anchor have large ...

AI Technical Summary

Problems solved by technology

[0005] Various types of energy-absorbing bolts are also emerging in an endless stream in China, but there are still many defects in the existing bolts: such as patent publication number CN201981537U "water-swellable elastic anti-rockburst bolt", publication number CN204691804U "a suitable Anti-shock energy-absorbing anchor tray of deep underground engineering", publication number CN205743946U "a kind of anti-scour energy-absorbing anchor tray", etc., mainly by adding pressure-absorbing and pressure-absorbing devices (spring washers, deformation tubes, etc.) at the outer anchoring end, The structure is simple, the cost is low, the installation is convenient, and the effect of energy absorption and stress diffusion is good; however, its overall deformation and pressure absorption capacity is limited, and the exposed energy absorption device faces problems such as encroaching on the clearance of the section, requiring anti-rust and anti-corrosion, and affecting construction.

Publication No. CN101929347A "A Coordinated Deformation Energy-absorbing Bolt Applicable to High Stress and Large Deformation Rock Mass Mining", Publication No. CN201857612U "A Prolonged-Elastic Anti-rock Burst Bolt", Publication No. CN106640161A "A Good Elongation Anchor High-strength energy-absorbing anchors, etc., part of the free section of the rod body is designed to be wave-shaped to generate deformation to absorb energy, the structure is simple, and the production and construction are convenient; but the rod body is often in direct contact with the air, and its anti-corrosion and durability are poor

Publication number CN102286975A "a constant resistance energy-absorbing bolt for strengthening large deformation rock mass", publicity number CN104265339A "a squeeze and frictional energy-absorbing bolt", public number CN101858225A "constant resistance large deformation bolt", etc., The coordinated deformation of the bolt and the surrounding rock is mainly achieved through the deformation or slippage of the pressure relief device (casing) on ​​the rod body, so as to achieve the purpose of pressure absorption and pressure relief; however, the production is complicated, the construction is difficult, and the cost is high. Promotion and application in practical engineering

In addition, most of the current energy-absorbing anchors are two-point anchoring structures, that is, the inner anchoring section and the outer anchoring section unit. Once one unit fails, the entire anchor will be destroyed.

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