Pre-stressed anchor cable structure with repetitive hydrofracture grouting function and construction method thereof

Abstract

The invention discloses a pre-stressed anchor cable structure with a repetitive hydrofracture grouting function and a construction method thereof. The anchor cable structure comprises a free section,an anchoring section and a drilling extension section from outside to inside in sequence, and the anchor cable structure further comprises a primary grouting pipe, two secondary grouting pipes, centering supports and a steel strand. The primary grouting pipe is arranged in the centers of the centering supports, and a tail pipe opening is formed in the bottom end of the anchoring section. The two secondary grouting pipes are fixedly connected to the outer sides of the centering supports, a tail pipe opening of one of the secondary grouting pipes is formed in the 1 / 3 portion away from the bottomend of the anchoring section, a tail pipe opening of the other one of the secondary grouting pipes is formed in the 2 / 3 portion away from the bottom end, and grouting holes are formed in the secondary grouting pipes. The centering supports are arranged along the anchoring structure at intervals, and the steel strand is arranged on the outer sides of the centering supports. According to the pre-stressed anchor cable structure, the primary grouting pipe is arranged in the middle of the anchor cable structure, the two secondary grouting pipes are oppositely arranged on the outer side of the anchoring structure, multi-time repetitive hydrofracture grouting is achieved, the bearing ability of an anchor body is effectively improved, and the economic effect is improved.

Description

technical field [0001] The invention relates to the technical field of rock and soil construction, in particular to a prestressed anchor cable structure with repeated splitting and grouting and a construction method thereof. Background technique [0002] In geotechnical anchoring projects, the anchoring quality of prestressed anchor cables directly affects the safety and economy of the project, and the bearing capacity of anchor cables mainly depends on the anchoring force of the anchor section. At present, there are many studies on improving the bearing capacity of the anchorage section of the anchor cable, including the use of enlarged head bolts, secondary splitting and other methods. The split grouting technology is to compact the rock and soil mass and fill the cracks through the splitting action of the grouting fluid, increase the diameter of the anchorage section, enhance the mechanical properties of the rock and soil mass around the anchorage section, and increase th...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of secondary splitting grouting is often used to increase the bearing capacity of the anchor cable, but the existing prestressed anchor cable splitting grouting can only achieve secondary splitting, and the existing secondary splitting anchor cable structure uses one-time grouting The pipe is located at the edge of the anchor cable, and the secondary grouting pipe is located in the middle of the anchor cable. The original design of the secondary grouting pipe is far away from the interface between the anchor and the soil, and it is difficult to achieve the best effect of splitting grout. The secondary grouting pipes are made of PVC pipes, and the damaged pipes cannot be reused after the primary and secondary grouting

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