High-strength metal pressure-yielding anchor rod with headed tail

Abstract

A high-strength metal pressure-yielding anchor rod with a headed tail comprises a rod body, a tray, a pressure-yielding pipe and a nut. The rod body is integrally formed by high-strength cylindrical threaded steel and comprises a head, a body and a tail. The tail is subjected to heading and thread rolling, and the surface thereof is provided with a thread in the diameter 4-5mm larger than that of the rod body. After being headed and subjected to thread rolling, the tail is subjected to high-temperature thermal treatment, so that the strength of the tail is higher than that of the rod body. The tray, the pressure-yielding pipe and the nut are sequentially sleeved on the tail, the length of the pressure-yielding pipe ranges from 30mm to 40mm, a rigidity washer is arranged between the tray and the pressure-yielding pipe, and another washer and a resin washer are arranged between the nut and the pressure-yielding pipe.

Description

technical field [0001] The invention relates to a bolt used in large-deformation roadways such as deep wells with high ground stress, roadways greatly affected by dynamic pressure, or soft rock with difficult support, and in particular relates to a high-strength metal thick tail yielding pressure bolt. Background technique [0002] In our country, the structural design of metal bolts is not reasonable enough. Practice shows that most of the bolts will break at the end of the bolt when the deformation of the roadway surrounding rock is large. In order to solve this problem, the domestic anchor rod manufacturing has gone through the process of changing the thread processing of the anchor tail from thread turning to rolling thread. Later, measures such as heat treatment were taken on the anchor tail to improve the strength of the anchor tail and prevent breakage. Some domestic scholars and experts have conducted research, and after the anchor tail is strengthened by heat treatm...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of ordinary rock bolt body materials, solve the problem of bolt anchor tail breakage, and at the same time meet the needs of deep wells, soft rocks, and large deformation roadways affected by dynamic pressure, the present invention proposes a new type of rock bolt Form, that is, high-strength metal thick tail pressure anchor

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