Expansion shell type yielding anchor cable and construction method thereof

Abstract

The invention belongs to the technical field of anchoring and supporting of underground engineering such as tunnels, and discloses an expansion shell type yielding anchor cable and a construction method thereof. A variable-section yielding anchor cable is fixedly mounted at the upper end of an expansion shell anchoring part, and an anchorage device is fixedly mounted at the lower end of the expansion shell anchoring part; a hollow metal pipe is arranged in the middle of an anchor cable body, and the hollow metal pipe is wrapped with a high-strength conical pipe; and the outer side of the anchor cable body is wrapped with a variable-section threaded sleeve through a binder. The expansion shell type yielding anchor cable is mainly applied to anchoring and supporting of water-rich tunnels, especially high-stress large-deformation water-rich underground engineering, and the variable-section yielding anchor cable, the expansion shell anchoring part, the anchorage device and a base plate form an anchoring technology integrating rapid anchoring, yielding supporting and grouting protection; and surrounding rock is rapidly supported through the biting force formed by the expanded expansion shell anchoring part and the hole wall surrounding rock, the deformation capacity of the anchor cable is improved through the yielding function of the variable-section yielding anchor cable, and post-grouting protection is achieved through the hollow metal pipe arranged in the variable-section anchor cable.

Description

technical field [0001] The invention belongs to the technical field of anchoring support for underground engineering such as tunnels, and in particular relates to a shell-expanding yielding anchor cable and a construction method thereof. Background technique [0002] At present, in underground projects such as tunnels, bolts are the first choice to stabilize the roof, floor and side walls. They have the advantages of good support effect, wide applicability, and high adaptability. A series of new anchors that integrate fast anchoring and permanent support, such as anchors and segmented anchors. However, the support strength of anchor bolts is lower than that of anchor cables. As the tunnel gradually moves to deep ground, structural belts and other high-stress complex geological environments, it is difficult to obtain a good support effect, and large deformation disasters occur frequently. For this reason, in high-stress and large-deformation underground engineering, anchor c...

AI Technical Summary

Problems solved by technology

However, the anchoring force (extremely) of the resin anchoring agent will inevitably decrease significantly in the water-rich section, making it difficult to take advantage of the high supporting force of the anchor cable; It is very easy to break during the support process; and all of the above will lead to the failure of the anchor cable support

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