Full-length hollow drainage and resistance-increase type yielding anchor rod

Abstract

The invention discloses a full-length hollow drainage and resistance-increase type yielding anchor rod which comprises a rod body. A plurality of drainage holes are formed in the outer surface of therod body; a yielding pipe and a tray are sequentially connected to the upper part of the rod body from top to bottom; a resistance increase structure is fixedly connected to the bottom part of the rodbody; the yielding pipe comprises a yielding ring; a section of compression section is arranged on each of two sides of the yielding ring and is connected with the rod body; and a gap is left betweenthe yielding ring and the rod body. According to the full-length hollow drainage and resistance-increase type yielding anchor rod provided by the invention, during supporting, a supporting body has acertain supporting strength, the integrality of reinforced surrounding rock is improved, a supporting system is ensured to have a certain yielding performance, and on the premise of reaching a high pretensioned stress of the anchor rod, the stress on the anchor rod can be increased, so that the stability of a tunnel is maintained; the yielding pipe has a protection effect on the rod body, and thesupporting of the yielding anchor rod can adapt to the problems such as large deformation and high ground stress; and the drainage problem in common anchor rod supporting is solved, a drainage function is combined with the anchor rod, a drainage effect can be improved, and the drainage efficiency is improved.

Description

technical field [0001] The invention relates to a pressure yielding anchor, in particular to a full-length hollow drainage increasing resistance type yielding anchor. Background technique [0002] With the expansion of engineering construction to areas with complex engineering geological conditions, more and more projects encounter problems such as high ground stress, large deformation, rockburst, and dynamic load. new requirements. During the excavation process of underground engineering, the strength of the surrounding rock is lower than the secondary stress, and the surrounding rock enters the stage of plastic deformation and forms a plastic zone. If it is not supported in time, the surrounding rock at the top will easily collapse, and the collapsed part will A collapsed arch is formed within a certain depth range of the rock. The stability of surrounding rock in underground caverns is the key to the construction of large-scale underground projects, and anchor support i...

AI Technical Summary

Problems solved by technology

[0003] There are still some problems in the existing support methods. For example, the anchor rod used in the support process is a general-strength rod body. When the surrounding rock of the tunnel is deformed, the inward movement of the tunnel will squeeze the surrounding rock, causing the surrounding rock between the anchors to be broken, which will easily cause the overall deformation of the tunnel and the surface support. low maintenance efficiency; it is difficult to adapt to the large deformation of the project; in addition, there are few examples of combining anchorage measures and drainage measures

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