Device and method for anchoring a large-diameter borehole using a small-diameter anchor cable

Abstract

The invention provides a device and method for using a small diameter anchor cable to anchor a large diameter drilling hole. The diameter of the anchor cable is smaller than the diameter of the drilling hole, a gap is between the inner side walls of the anchor cable and the drilling hole, and an anchor sleeve pipe is arranged at the gap; a resin anchor agent is filled between the anchor sleeve pipe and the anchor cable, and the resin anchor agent is filled at the gap between the anchor sleeve pipe and the drilling hole; in the process of filling the anchor agent, the anchor cable driven by a drilling rig pushes the anchor agent to the bottom of the anchor sleeve pipe while rotating and stirring, the anchor cable is combined with the anchor sleeve pipe after static placement, and then the drilling rig drives the anchor cable and the anchor sleeve pipe to push and stir the anchor agent between the drilling hole and the anchor sleeve pipe; the anchor agent inside and outside of the anchorsleeve pipe is well stirred, the stirring effect is more uniform, and meanwhile, the smaller diameter anchor cable is used for anchoring the larger diameter drilling hole. The device and method for using the small diameter anchor cable to anchor the large diameter drilling hole improves the working efficiency, and saves the construction cost.

Description

technical field [0001] The invention belongs to the technical field of support equipment, and in particular relates to a device and method for anchoring large-diameter boreholes with small-diameter anchor cables. Background technique [0002] Anchor cable anchoring is an indispensable reinforcement and support method used in the construction of surface engineering such as slopes and foundation pits and underground chambers such as tunnels and roadways, especially when the surrounding rock conditions of the roof are poor. In order to prevent the collapse of the tunnel roof, anchor cables are used to combine the surrounding rock with the stable rock mass to produce the effects of suspension, reinforcement, and composite beams, so as to achieve the purpose of strengthening the rock mass. [0003] At present, resin anchoring agent is a widely used bonding and anchoring material in the field of modern support because it can obtain a high degree of safety, reliability, durability,...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the large difference between the diameter of the drill hole and the diameter of the anchor cable in the above-mentioned prior art, thus causing the resin anchoring agent to be unable to be fully stirred, mixed and solidified, and the anchoring force to decrease, which affects the entire construction efficiency. At the same time as the hole diameter is used for anchoring, the small diameter anchor cable is used for anchoring, which not only reduces the construction cost, but also improves the construction efficiency, and ensures the anchoring force

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