Anti-shock ground pressure extension bolt

Abstract

The invention relates to an anti-shock ground pressure extension rock bolt, which includes a front bolt body and a middle bolt body, the front bolt body and the middle bolt body are connected through a connecting sleeve, and also includes a relief rod, a thin-walled round pipe, a clip hoop, dish-shaped tray, and lock nut, and the relief rod, thin-walled round pipe, clamp, dish-shaped tray and lock nut constitute the anchor rod relief anti-shock device, and the lower end of the relief rod is provided with a thread, which passes through The connecting sleeve is connected with the middle anchor rod body, the upper end of the relief rod is wedge-shaped; the upper end of the thin-walled circular tube is provided with external threads, the relief rod is inserted into the thin-walled circular pipe, and the lower end of the thin-walled circular pipe is pressed against the relief rod. Tight, a hoop is installed on the pressing position; a dish-shaped tray is set on the threaded end of the thin-walled round pipe, and a lock nut is used to connect and fix the thin-walled round pipe on the top of the dish-shaped tray. The invention increases the elongation rate of the anchor rod while increasing the length of the anchor rod, and has simple structure, safety and reliability.

Description

technical field [0001] The invention belongs to coal mine impact roadway support equipment, in particular to an anti-shock ground pressure extended bolt. Background technique [0002] In coal mine roadway support, bolt is the most widely used and most used support equipment. With the continuous deepening of mining depth, the roadway will show significant large deformation characteristics under high ground pressure environment, which is specifically manifested as large deformation of soft rock , rockburst large deformation, gas outburst large deformation. However, the existing bolts have low elongation rate and insufficient length (the width of the roadway is generally 3-5m, and the length of the bolt is generally about 2.4m. Too long is not convenient for installation, but the plastic zone of the surrounding rock of the roadway may be greater than 2.4m. Anchor bolts cannot be connected to the surrounding rock original rock stress zone). The existing bolts are not suitable ...

AI Technical Summary

Problems solved by technology

However, the existing bolts have low elongation rate and insufficient length (the width of the roadway is generally 3-5m, and the length of the bolt is generally about 2.4m. Too long is not convenient for installation, but the plastic zone of the surrounding rock of the roadway may be greater than 2.4m. The bolt cannot be connected to the stress zone of the surrounding rock)

The existing bolts are not suitable for the support of rock burst tunnels and roadways with large deformation of surrounding rocks. Due to the sudden burst of rock pressure, a large amount of energy is released instantaneously, causing large deformations of surrounding rocks, and the deformation of surrounding rocks in roadways exceeds the capacity of anchors. range, it will lead to the failure of bolt support, and then cause roadway roof fall, landslide and other accidents

[0003] Aiming at the low elongation rate of the anchor rod, the Chinese patent No. 201120066745.X discloses a friction sleeve type large deformation anchor rod, but there are problems such as jumping force on the anchor rod during the deformation process and complicated processing of the friction sleeve. , Chinese Patent No. 201010196197.2 discloses a constant-resistance large-deformation bolt, the inner surface of the constant-resistance device and the outer surface of the rod body are threaded, and there is a problem of frictional sliding that is difficult to occur at the threaded connection

In short, the existing conventional bolts have a low elongation rate and cannot meet the support requirements of the rock burst roadway. The effect of the existing large-deformation bolts is not ideal, which is not conducive to the promotion and application in practical engineering.

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