Removal Method of Anchor Cable Reinforcement in Rock and Soil Strata

Abstract

The invention relates to a removal method of the anchor cable reinforcement body in geotechnical stratum, which belongs to the technical field. The existing flexible hollow drill pipe and the drill bit equipped with a grinding body on the inner wall are adopted in this method; the drill pipe, which jacketed outside of the anchor cable reinforcement body, is drilled into the rock-soil layer along the anchor cable reinforcement body; when the drill pipe is drilled to the bottom of the anchorage section of the anchor cable reinforcement body, it stops drilling and the grinding body stays at the bottom of the anchor cable reinforcement body; or when the drill bit without grinding body is drilled to the bottom of the anchorage section, then the drill pipe is withdrawn and the drill bit with grinding body is used for re-entry; keep the drill pipe rotating, the drill pipe will swing along the radial direction of the anchor cable reinforcement body, the grinding body will form continuous grinding to the bottom end of the anchor cable reinforcement body under the rotation and swing of the drill pipe, and eventually cuts off or wears the anchor cable reinforcement body at the bottom end; Finally, the cut or worn anchor cable reinforcement body will be pulled out.

Description

technical field [0001] The invention relates to a method for removing anchor cable tendons in rock and soil strata, and belongs to the technical field. Background technique [0002] In the field of geotechnical engineering, the tendons of many anchor cables used are often left behind in the formation to form obstacles after use, which affects development. In recent years, although there are technologies such as recyclable anchor cables, there are still some phenomena that are partially destroyed and cannot be recycled. [0003] At present, methods such as cutting and manual excavation are used for a large number of remaining tendons in the rock and soil layer, but the best method is to drill cores, that is, use casings to remove the lateral connection between the anchor cable and the surrounding soil, and then remove the tendons. The body and cement body were removed as a whole. However, in actual operation, there are several major disadvantages: [0004] 1. The space req...

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Problems solved by technology

[0004] 1. The space required by the equipment is too large, and many projects cannot be used, especially in foundation pit projects. The distance between the anchor head and the main structure is very small, many of which are less than 1 meter. This kind of equipment has no working space and its use is limited.

[0005] 2. The overall removal of the anchor cable (reinforcement body and cement body) will cause underground holes, resulting in a decrease in the strength of the surrounding strata, and there are major hidden dangers such as uneven settlement

[0006] 3. In areas with a high groundwater level, the large holes in which the anchor cables (reinforcement and cement body) are pulled out as a whole will cause a large amount of groundwater loss, especially in areas where the anchor cables pass through confined water, there will be a very large safety hazard

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