Self-tightening prestressed anchor cable

Abstract

The invention relates to the field of prestress anchor cables, and discloses a self-tightening type prestress anchor cable. The self-tightening type prestress anchor cable comprises a locking section in a soil body, the locking section comprises an anchoring wire and a pressure-bearing section, the anchoring wire penetrates through the pressure-bearing section, the inner end of the anchoring wire is connected with a drilling head, the anchoring wire is connected with an expansion structure, the upper end of the expansion structure is fixedly connected with the lower end of the pressure-bearing section, and the lower end of the expansion structure is connected to the outer end of the drilling head. The expansion structure is provided with a plurality of supporting rods which expand outward in the vertical direction of the anchoring wire or are folded inwards. After prestress is applied to the prestress anchor cable and when the soil pressure or landslide thrust borne by the anchoring wire is increased, the drilling head is pulled to slide towards the outside of a hole, so that the expansion structure expands outwards in the vertical direction of the anchoring wire, in the expanding process of the expansion structure, the resistance borne by the expansion structure is larger, then deformation of the anchoring wire of the anchor cable is prevented, and the purpose of self-locking is achieved. The situation that external tension exceeds a designed allowable range and accordingly the anchor cable is damaged is effectively prevented.

Description

technical field [0001] The invention relates to the field of prestressed anchor cables, in particular to self-tightening prestressed anchor cables. Background technique [0002] The prestressed anchor cable is to anchor one end in the hard rock formation, and then stretch the other free end, so as to exert pressure on the rock formation and anchor the unstable rock mass. [0003] At present, after the prestressed anchor cable is prestressed, when the supporting structure deforms, the steel strand will drive the anchor cable anchor section to slide outward together. When the earth pressure or landslide force on the anchor cable is greater than the friction force of the anchor cable anchor section , the anchor cable will deform and increase to cause sliding failure. [0004] In the prior art, the design of the prestressed anchor cable allows the anchoring force to be fixed. Once the anchor cable is subjected to excessive earth pressure or landslide force, exceeding the fixed ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a self-tightening prestressed anchor cable, aiming at solving the problem in the prior art that the anchoring force of the prestressed anchor cable is a fixed value, and the anchor cable will slide outward and be damaged if the fixed value exceeds the fixed design allowable value

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