Recovery type thick reinforcing bar anchor rod and recovery method

Abstract

The invention provides a recovery type thick reinforcing bar anchor rod and a recovery method. The recovery type thick reinforcing bar anchor rod is composed of a thick reinforcing bar body (001), a pressure bearing plate (002), a recovery device nut (003), an end cap protection bin (004), a PVC sleeve locating ring (005), a PVC sleeve (006), a reinforcing bar outer threaded head (007), an end-bearing reinforcement hoop (008), an anti-leakage sealing isolation layer (009) and a grouting body (010). The thick reinforcing bar body (001) is connected with the recovery device nut (003) through the reinforcing bar outer threaded head (007). The recovery device nut (003) is welded to the pressure bearing plate (002). The end-bearing reinforcement hoop (008) is in spot welding connection with the pressure bearing plate (002). The recovery method comprises the steps that after anchoring force is unloaded, the exposed part of the thick reinforcing bar body (001) is twisted and rotated counterclockwise until the reinforcing bar body (001) breaks away from the recovery device nut (003), and then the reinforcing bar body (001) is pulled out and recovered.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a recoverable thick steel bar anchor and a recovery method for the anchor. Background technique [0002] In urban deep foundation pit support projects, as urban land becomes more and more scarce, conventional anchors often pass through the underground space beyond the red line of the land, which is likely to cause disputes over the property rights of the underground space, and is not conducive to later project construction. Many places have issued document restrictions Conventional bolts are used, therefore, the technology of recovery bolts was born. [0003] In the support of deep foundation pits, bolts are an important technical means. Both "pile row anchor cable support" and "spray anchor support" use anchor bolts. In "pile row anchor cable support" The large-tonnage prestressed anchor cable technology has been invented in "Protection", which has obvious advantages under cert...

AI Technical Summary

Problems solved by technology

[0005] As mentioned above "a kind of recovery anchor", it is difficult to process the inner thread opening on the pressure bearing plate, the precision is low, and it is difficult to meet the requirements of anchor recovery

[0006] As for the "recoverable anchor rod" mentioned above, there is no anti-leakage measure between the carrier body and the inner rod with external threads. During grouting, the slurry will leak into the connection between the carrier body and the inner rod with external threads, resulting Difficult or impossible to recycle

[0007] As for the "recoverable anchor" mentioned above, since the anchor is a pressure anchor, a large amount of slag inclusions are likely to be generated at the end of the anchor during the construction process, and the slurry strength is low. If no reinforcement is installed at the position of the bearing plate mechanism, the bearing capacity of the bolt is low and cannot meet the design requirements

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