Uniform pressure distribution type anchor cable

Abstract

The invention relates to a uniform pressure distribution type anchor cable, which comprises an outer anchor head, an anchor cable body and a multilevel cable body bearing structure. The first-level bearing structure of the cable body is a permanent bearing structure consisting of an extruding anchorage device and a bearing plate, the rest bearing structures at all levels are pressure-yielding bearing structures only consisting of pressure-yielding anchorage devices or consisting of pressure-yielding anchorage devices and bearing plates, the lengths of all prestressing tendons for forming the anchor cable body are equal, and the number of the bearing structures on each prestressing tendon is the same. The pressure-yielding anchorage device comprises an extruding sleeve and an anchoring medium, wherein the extruding sleeve and the anchoring medium are extruded and anchored on the prestressing tendons to form a pressure-yielding anchorage device; the anchoring medium is a spring wire witha circular cross section; and the prestressing tendons are non-bonded tendons made of stranded wires or wire cables or stranded wires and wire cables. The anchor cable has the advantages of having even integral stressed state, greatly reducing stress concentration of the anchored section in the anchor cable, and having excellent anchoring performance, simple construction process and safe operation.

Description

Technical field: [0001] The invention relates to an anchor cable, in particular to a pressure dispersion type anchor cable. Background technique: [0002] When the prestress acts on the structure, a special device is often required for the transmission of the prestress to ensure the reliability and effectiveness of the prestress. The prestressed anchor cable widely used in geotechnical engineering needs to drill holes inside the geological body to install the anchor cable body. In order to improve the anchoring force provided by the cable body in the rock and soil layer, the pressure dispersion anchor cable is often used. The inner anchorage section of the pressure-distributed anchor cable is composed of several load-bearing structures. When the anchor cable body is consolidated by the slurry and the steel strand corresponding to the load-bearing structure is stretched with a certain load, several load-bearing structures set at different depths The structure transmits the c...

AI Technical Summary

Problems solved by technology

[0003] In the original pressure-distributed anchor cable system, each level of load-bearing structure of each anchor cable is a relatively independent anchor cable system, such as Figure 11-Figure 13 As shown, the transmission of the prestress is independent, the length of the steel strands of each level of load-bearing structure is not equal, and the elongation values ​​of the steel strands of each level are different during tension, which makes the construction process cumbersome. If you are not careful, the whole bundle of anchor cables will be scrapped

Secondly, the unequal length of the steel strands of the cable body makes it inconvenient to adjust the prestress of the anchor cable. The pressure dispersion type anchor cable is an unbonded anchor cable, which cannot be adjusted as a whole when adjusting the cable, and a single cable is required. The average tensile force of the anchor cable has reached the design value, which is unsafe in operation

In addition, the inhomogeneity of the anchor cable steel strands of the pressure dispersion anchor cable increases during the long-term work, and its long-term anchoring performance deteriorates, which is a safety hazard for engineering operations.

In addition, the pressure dispersion type anchor cable cannot be tested for ultimate bearing capacity, and the design safety reserve of the anchor cable reinforcement project cannot be verified.

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