Recoverable multi-section self-adaptive expansion anchor rod

Abstract

The invention discloses a recoverable multi-section self-adaptive expansion anchor rod, and belongs to the technical field of slope reinforcement. The recoverable multi-section self-adaptive expansion anchor rod comprises an anchor rod shell, the interior of the anchor rod shell is of a hollow structure, concrete is injected into the anchor rod shell, the anchor rod shell is arranged in a drill hole of a soil body, the anchor rod shell comprises a plurality of internal thread sections and a plurality of expansion sections, one expansion section is arranged between two internal thread sections, and internal thread sections are arranged at the two ends of the anchor rod shell. According to the recoverable multi-section self-adaptive expansion anchor rod, after a tension screw is twisted, force is continuously applied, the expansion sections of the anchor rod expand, the anchor rod can be adaptively attached to surrounding rock in the expansion process, the attachment degree is good, the bond stress is high, the expansion attachment degree is good, and after grouting is conducted inwards, the anchor rod is higher in pulling resistance compared with a friction type anchor rod and an expansion type anchor rod; and the anchor rod can be recovered aiming at the situation that the anchor rod needs to be recovered in an urban area, the underground red line is prevented from being broken through, the internal stress condition during installation and whether straightening is achieved during recovery can detected, high recovery efficiency is achieved, the internal stress condition can be detected in real time, timely replacement can be conducted in case of damage, and accidents are avoided.

Description

Technical field [0001] The present invention relates to the field of slope reinforcement techniques, and more particularly to a recyclable multi-segment adaptive expansion anchor bar. Background technique [0002] At present, the anchor has two forms: 1, friction-type anchor, mainly relying on the adhesion and frictional transfer load of the anchoring section and the surrounding soil, belonging to the frictional anchor. Its main disadvantage is: (1) The size of the anchoring force depends on the length of the anchoring section and the nature of the nature of the soil of the anchoring section, such as encountering special weak soil, and thus the pulling force of the anchor is not high. The reinforcement effect is poor; (2) the problem of the intensity of cement soil in general high pressure spray expansion of the head anchor, the painting of the anchoring body and the anchor body; 2, expand the anchor, the anchor The expansion of the expansion structure is expanded, and the expans...

AI Technical Summary

Problems solved by technology

Its main disadvantages are: (1) The anchoring force depends on factors such as the length of the anchoring section and the nature of the soil in contact with the anchoring section. If it encounters a special weak soil, the pullout force of the anchor is not high. (2) Ordinary high-pressure injection expansion head anchors have the problems of low cement-soil strength and poor gripping force between the anchor body and the anchor body; When the enlarged structure is stretched, it is difficult to open the enlarged structure, the anchoring body has poor grip on the surrounding soil, the compressed end is not dense, and the fit with the hole is not good, etc.

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