Self-locking device and self-locking prestressed anchor cable with the self-locking device

Abstract

A self-locking device and a self-locking prestressed anchor cable with the self-locking device, the self-locking device includes: a load-bearing steel plate and a limit steel plate, the load-bearing steel plate is a cylinder, and the axial direction is provided for the anchor cable to pass through. The equal-diameter straight holes passed through and the tapered anchor holes for locking the anchor cables are symmetrically distributed. The tapered anchor holes taper in the direction opposite to the tensioning direction of the anchor cables. There is a clip for clamping the anchor cable that matches the structure of the anchor hole; the limiting steel plate is in the shape of a circular plate, which is fastened to the side of the load-bearing steel plate close to the large opening of the tapered anchor hole by bolts, and the A round hole that just allows the anchor cable to pass is arranged in the limiting steel plate. On the basis of the conventional anchor cable structure, the self-locking prestressed anchor cable locks the anchor cable by setting a self-locking device on the free section. It has the advantages of uniform distribution, reduced reaction force structure scale, convenient construction, cost saving, and environmental protection.

Description

technical field [0001] The invention relates to anchor cable engineering, in particular to a self-locking prestressed anchor cable and a self-locking device used in the self-locking prestressed anchor cable. Background technique [0002] With the continuous expansion of the scale of national infrastructure, anchor cable engineering structures have been widely used in permanent civil reinforcement projects such as landslides, high slopes, tunnel chambers, dam foundations, and deep foundation pit reinforcement. [0003] Such as figure 1 As shown, according to its mechanism of action, the existing prestressed anchor cable includes: an anchor segment 11 (section A in the figure) that is deeply buried in the bottom of the anchor hole 10 and bonded with the hole wall through the grouting body, is located in the hole and can freely The elongated free section 12 (section B in the figure) and the anchor head 13 fixed on the orifice reaction force structure (section C in the figure)....

AI Technical Summary

Problems solved by technology

[0004] like figure 1 It can be seen that the mode of action of the existing prestressed anchor cables is the anti-pull action between the comprehensive force of the anchor section and the reaction force structure, while the free section only exists as a force transmission mechanism, and the formation of the free section serves as the entire Part of the anchoring energy field, the current prestressed anchor cable does not effectively play the role of its energy field, resulting in the following limitations of the existing prestressed anchor cable:

[0005] 1. Construction technology: The anchorage load needs to be balanced by the reaction structure, and the reaction structure is mainly composed of reinforced concrete, which increases the construction difficulty and prolongs the construction period, and the effect is slow in special emergency projects

[0006] 2. Stress field distribution: Due to the low mechanical strength of the shallow surface rock (soil) layer at the general anchorage site, in order to ensure the load balance, only the reduction of the anchorage load or the increase of the reaction force structure section can be used to make up for it, resulting in waste of materials

In addition, the reaction force structure is basically under the action of concentrated load, and it is easy to induce sudden accidents due to local defects in the outer anchor head

[0007] 3. Load loss: Because the strata in the free section only play a role of transmission in the force system, and the stratum in this section generally has part of the rock (soil) body destroyed during the stretching process, and deformation occurs due to the readjustment of the stress field in the later stage of locking , aggravating the loss of anchor load

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