recyclable bolt

Abstract

The invention discloses an anchor rod for foundation pit support engineering, in particular to a recyclable anchor rod. The recyclable anchor rod comprises a hollow anchor rod and a central anchor rod, and a water injection gap is formed between the hollow anchor rod and the central anchor rod; the hollow anchor rod is provided with multiple arched hinged sheet groups arranged along the axis of the hollow anchor rod; the end part of one side of the central anchor rod extends out of the hollow anchor rod, and a drill head is formed and fixed with the hollow anchor rod; the end part of the otherside of the central anchor penetrates through a locking screw cap, and under the driving of the locking screw cap, the central anchor rod drives the hollow anchor rod to compress; first hinge sheetsand second hinge sheets in the multiple hinge sheet groups are mutually arched; each hinge sheet group is wrapped with a waterproof cloth sleeve; and high-pressure water bodies can be injected into the water injection gap between the hollow anchor rod and the central anchor rod and the waterproof cloth sleeves, and pressure maintaining is carried out. According to the recyclable anchor rod, the ultimate tensile bearing capacity is larger, and the rod can be completely recycled.

Description

technical field [0001] The invention relates to an anchor rod used in foundation pit support engineering, in particular to a recoverable anchor rod. Background technique [0002] In the construction of foundation pit support in civil engineering, bolt support is a construction technology commonly used for soil wall support during excavation of foundation pits. Its advantages are: it can provide a large working surface, and there is less interference with other processes. The technology is mature, the construction is simple, the cost is low, and the application range is wide; especially suitable for the foundation pit with a large excavation surface. When the excavation area of ​​the foundation pit is large, it will cause great difficulties if the internal support is used, and the support arrangement is complicated, which seriously affects other Process construction. Therefore, various types of soil anchor technology are widely used in slopes, foundation pits, tunnels, under...

AI Technical Summary

Problems solved by technology

[0005] But still there is technical defect in above-mentioned a kind of recoverable bolt

In order to achieve the purpose of recovering the anchor rod, when the anchor rod of the above structure is supported in the foundation pit, the stress points of the anchor rod body are concentrated on the stretched upper and lower rods. During construction, the general pull-out bearing capacity of the anchor needs to reach hundreds of kilonewtons (KN), and some even require the pull-out bearing capacity to reach thousands of kN. ) under the pressure exerted by the soil wall, and the inner side does not apply a reverse force, it is easy to produce irreversible permanent deformation, which affects the secondary use, and even in the current use process, when the temporary support of the anchor After the protection function fails, the anchor cannot be recovered because the upper and lower rods of the anchor cannot be retracted.

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