Progressive yielding combined-type extensible anchor rod and construction method thereof

Abstract

The invention discloses a progressive yielding combined-type extensible anchor rod and a construction method thereof. The extensible anchor rod comprises a pipe seam-type anchor rod and a resin anchor rod made of a deformed steel bar, which are mounted in anchoring holes; the resin anchor rod is longer than the pipe seam-type anchor rod, and penetrates the rod body of the pipe seam-type anchor rod; a progressive yielding piece, which is a steel spherical housing, is arranged between a pallet and a nut of the resin anchor rod; the section of the steel spherical housing takes the shape of a cavel; and a through hole, through which the rod body of the resin anchor rod penetrates, is formed on the bottom surface of the steel spherical housing. The progressive yielding combined-type extensible anchor rod can serve as not only a temporary support, but also a permanent support, so as to solve problems in supporting deep, soft and crushed surrounding rock laneway.

Description

technical field [0001] The invention relates to a bolt used for mine engineering support, in particular to a bolt allowing controlled deformation of surrounding rock. Background technique [0002] In the construction of mine roadways, chambers and tunnels involved in geotechnical engineering, in order to control the deformation of the surrounding rock and prevent its instability, a main means of strengthening the surrounding rock is to use bolt support. The so-called bolt support is to drill an anchor hole on the surrounding rock of the roadway, and anchor the bolt in the anchor hole to play the role of supporting and strengthening the surrounding rock. Bolt support can fully mobilize the bearing capacity of rock and soil itself, and has achieved good application results in mine roadway support. [0003] With the continuous development of geotechnical engineering construction technology and support concepts, various types of bolts are also emerging in an endless stream. Ac...

AI Technical Summary

Problems solved by technology

At present, the anchors that can provide "resistance" cannot provide "resistance" at the same time, and roadway collapse accidents frequently occur; the anchors that can only provide "resistance" often appear "unanchored" and "broken"

[0010] (3) The zonal rupture of the deep rock mass causes detachment or partial damage inside the surrounding rock, resulting in uneven stress on the bolt support, and a loose space for the surrounding rock or a loose hole wall is formed between the anchor end of the end anchor and the pallet. The effective anchoring length is shortened, the anchoring force is reduced, and the self-supporting ability of the surrounding rock itself is difficult to exert

[0011] In summary, threaded steel resin anchors and pipe-slit anchors cannot effectively support deep, weak, and broken surrounding rock roadways.

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