Recyclable anchor rod for foundation pit support and construction method thereof

Abstract

The invention discloses a recyclable anchor rod for a foundation pit support and a construction method thereof. The recyclable anchor rod comprises a concrete prefabricated member and a round steel anchor rod, wherein a hollow metal thread casing pipe is arranged inside the concrete prefabricated member; an external thread is arranged at the front end part of the round steel anchor rod and is screwed with the concrete prefabricated member through the metal thread casing pipe; and a locking thread is arranged at the tail of the round steel anchor rod. After supporting is completed, the round steel anchor rod is rotated, so that the round steel anchor rod is screwed out from a thread sleeve of an anchoring support; and the whole round steel anchor rod can be recycled by drawing out the round steel anchor rod, so that the process is simple, rapid and high-efficiency. Concrete with lower intensity and the shell-shaped metal thread casing sleeve are remained in a rock-soil body, so that the concrete and the metal thread casing sleeve are easy to cut and crush by construction machinery when the underground development is carried out in future. Furthermore, the supporting cost is low, the mounting is convenient and the dismounting is easy. The construction method comprises the following steps of: firstly, pouring the concrete around the metal thread casing pipe to manufacture the concrete prefabricated member; screwing the round steel anchor rod in the concrete prefabricated member; grouting to realize that the anchor rod is anchored.

Description

technical field [0001] The invention relates to an anchor rod, in particular to a recoverable anchor rod used for foundation pit support. The invention also relates to a construction method of a recoverable anchor rod. Background technique [0002] Prestressed anchor cable reinforcement and support is an important form of support for building foundation pits, and it is mostly used in the support of deep foundation pits in urban centers. With the development of society, the construction land is becoming more and more tense, and the depth of foundation pit is also increasing. Therefore, the requirements for safety level are getting higher and higher, and the prestressed anchor cable reinforcement technology has also highlighted its important position. However, with the widespread application of prestressed anchor cables, the non-recyclability of ordinary anchor cables has also brought about great social problems. When the temporary support function fails, ordinary anchor cabl...

AI Technical Summary

Problems solved by technology

The patent announcement number is: CN200964593Y's "Recyclable Prestressed Anchor Cable" adopts a U-shaped carrier structure, which is complicated in structure and high in production cost. After the steel strand is made into a U shape, the strength of the steel strand itself is affected, and the cable body is increased. cost, and the steel strand is wavy after recycling, and the original linear shape of the steel strand cannot be restored, so the steel strand can only be recycled and cannot be reused

[0005] The existing recyclable anchor cable systems at home and abroad all have the problems of complex cable structure and high recycling cost

Some anchoring devices with integral grouting may easily cause damage to the outer rubber hose when the anchor head is recovered, and the slurry block enters the arc groove, resulting in increased frictional resistance and difficult recovery

When the anchor cable is placed for construction after the hole is formed, it is easy to bond with the surrounding soil, making the installation more difficult, easy to cause collapse and blockage of the hole, difficulty in recycling construction, and low recovery rate

In addition, because the anchor head is set too large and too long, especially in the case of multi-level anchor heads, the number of anchor head steel bars remaining in the ground is relatively large

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