Self-drilling and self-anchoring retrievable bolt for soil and sand layers and its anchoring method

Abstract

A self-drilling, self-anchoring and recoverable bolt for soil and sand layers and an anchoring method thereof, comprising a bolt body for supporting, and a bolt body for driving the bolt to be screwed into the supporting base on the bolt body. The attachment part that is screwed out and is embedded with the support base, through the attachment part, realizes the screw-in and unscrews with the support base, and realizes the embedded connection with the support base, and no longer forms first Anchor bolt hole, thus shortening the bolt installation time and improving the efficiency of support.

Description

technical field [0001] The invention relates to a self-drilling self-anchoring recoverable anchor rod and an anchoring method thereof, in particular to a self-drilling self-anchor recoverable anchor rod used in soil and sand layers and an anchoring method thereof. Background technique [0002] Bolt support or soil nail support is the main method of foundation pit support. The existing anchor method of bolt support is to first drill the anchor hole with a drilling rig, and put the anchor rod or soil nail made of threaded steel into the anchor. Then inject the cement slurry into the anchor hole. After the cement slurry is solidified, apply prestress to the anchor rod or directly connect the soil nail with the steel bar in the surface layer to form the reinforcement of the surface layer. [0003] There are many problems in existing anchor rods, soil nails and their anchoring methods, which are described as follows: [0004] 1. The anchor hole needs to be additionally drilled w...

AI Technical Summary

Problems solved by technology

[0004] 1. The anchor hole needs to be additionally drilled with a drill pipe. After drilling, it must be pulled out, and then loaded into the anchor rod or soil nail rod body, injected with cement slurry, and filled with more steps;

[0005] 2. After the cement slurry pouring is completed, it needs to wait until the strength of the anchor reaches the design requirements before tensioning can be carried out, which is a waste of time;

[0006] 3. When drilling in silt and medium-coarse sand formations, it is easy to collapse holes, which will affect the rod installation and grouting effect;

[0007] 4. Anchor rods or soil nails are abandoned underground after completing the support task, causing pollution to the stratum. Some anchor rods or soil nails directly affect the excavation of municipal pipeline trenches, subways, power tunnels, comprehensive pipe galleries, etc. engineering

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