A New Type of Durable Magnetized Anchor Rod

Abstract

The invention discloses a novel durable magnetization anchor rod which comprises an anchor rod body, a conical end sleeve, a conical block nut, a claw-shaped elastic anti-expansion outer bushing, a concave spring ring, an elastic magnetization slotting steel pipe, a rubber bushing, an arch tray, an antifriction gasket, an opposite-abutting thickening nut fastening mechanism. The novel durable magnetization anchor rod is characterized in that the conical end sleeve guides the anchor rod body to be drilled into a drill hole, the conical block nut and the deep hole wall of the drill hole form a self-locking structure, the anchor rod body can be pushed axially, the claw-shaped elastic anti-expansion outer bushing is moved to the end of the anchor rod body, the elastic magnetization slotting steel pipe is released, claw teeth are retracted, the concave spring is compressed axially, the elastic magnetization slotting steel pipe is expanded, a wedge block is fitted, the outer wall of the steel pipe and the wall of the drill hole are extruded tightly, and the opposite-abutting thickening nut fastening mechanism compresses the arch tray to exert pretightening force on the anchor rod. On one hand, the anchor rod can stabilize a rock layer by enabling surrounding rock to be in the three-way stress state; on the other hand, the effective action time of the pretightening force of the anchor rod on the surrounding rock can be prolonged, the durability of the anchor rod can be improved, and the supporting efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of coal mine underground or tunnel support, in particular to a novel durable magnetized anchor rod, which is used to stabilize rock formations and prevent them from breaking or collapsing. Background technique [0002] At present, the bolt support technology has been widely used in the tunnel support of various projects such as mine roadways and railways, hydropower, and slopes at home and abroad. . With the maturity of rock bolt stabilization technology, the application in mine roadway or tunnel support is becoming more and more important. There are many types of traditional anchors. Through the use of different types of anchors in engineering, it is found that the existing anchors have poor durability during the support process, it is difficult to apply a large pre-tightening force, the anchoring performance is unstable, and the support strength Low main disadvantage. For example, the invention patent (...

AI Technical Summary

Problems solved by technology

During the support process of the pipe-seam anchor, the anchoring force is very sensitive to the change of the hole diameter difference, and the anchoring force of the anchor is greatly affected by the drilling factors, and the anchoring performance is unstable; the hydraulic expansion anchor is directly in contact with the outside world during the support. , easy to be corroded by moisture, causing the bolt to fail; due to the large pitch of the threaded steel bolt and the difficulty in controlling the cooperation between the thread and the nut, it is difficult to apply a large pre-tightening force, and the pre-tightening force is often reduced due to back-off in field use ; As a result, the bolt cannot control the surrounding rock in a three-dimensional stress state for a long time, resulting in a reduction in the strength of the bolt support

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