A recyclable head-expanding bolt and its construction method

Abstract

The invention relates to a recyclable expansion anchor rod and a construction method thereof. The recyclable expansion anchor rod comprises an anchor head, a rod body, a protecting bag and a rod body protecting tube; the anchor head is composed of a screw, a herringbone expanding head, a spiral steel wire, a steel wire protecting tube and an anchoring piece; the herringbone expanding head is screwed in the screw; the spiral steel wire penetrates the herringbone expanding head to extend into the steel wire protecting tube; the steel wire protecting tube sleeves the screw; the anchoring piece is mounted at one end of the rod body; the rod body is composed of a plurality of equidistantly arranged steel strands, steel strand position fixing parts and steel strand tensioning parts, and the steel strands are respectively fixed on the anchoring piece, the steel strand position fixing parts and the steel strand tensioning parts; the protecting bag is arranged outside the anchor head; the rod body protecting tube sleeves the rod body and are in butt joint with the protecting bag. The recyclable expansion anchor rod and the construction method thereof have the advantages that simpleness in structure, convenience in mounting, repeated use and low cost are achieved and the like.

Description

technical field [0001] The invention relates to an anchor rod and a construction method thereof, in particular to a recyclable head-expanding anchor rod and a construction method thereof, and belongs to the technical field of civil engineering. Background technique [0002] At present, there are more and more construction projects with basements, and many basements have reached 2-3 floors, which has brought a lot of workload for foundation pit enclosure. In the southeast coastal area of ​​China, the shallow soft soil of the foundation is more common, and the bolt technology is widely used in the foundation pit protection project. [0003] Bolt technology is fast in construction and low in cost. In recent years, it has been vigorously developed, and a large number of recyclable bolts have appeared, which are mainly divided into bolts with expanded heads and bolts with external threads. The representative ones in the expanded head bolts are slurry bag anchor rods and mechanic...

AI Technical Summary

Problems solved by technology

The representative ones in the expansion head bolts are slurry bag anchor rods and mechanical expansion head bolts. However, this type of recyclable anchor rod cannot be restored to its original shape after grouting and mechanical expansion, so the anchor head cannot be recovered. Recycling, only the rod body can be recycled

For example, a slurry bag anchor rod is provided with a slurry bag at the anchor head, and the slurry bag is filled by pouring cement slurry, and the expansion head is formed after the cement slurry hardens, thereby achieving the anchoring effect, but because the cement slurry hardening is irreversible, so Make the anchor head part unable to be taken out from the soil body

Although the self-contained external threaded anchor can be fully recovered, the thread on the outer surface is small, and the anchoring capacity that can be produced is quite limited, which cannot be compared with the expanded head anchor.

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