Unlockable recyclable anchor cable structure and using method thereof

Abstract

The invention relates to the field of support and protection of a foundation pit, in particular to an unlockable recyclable anchor cable structure which is characterized by comprising a barrel-shapedprotective cover, a grouting-stop flange, a pre-stressed anchor cable, a guide line and an expansion assembly, wherein the expansion assembly is arranged at the headmost end in a head structure; positioning holes annularly formed and a guide line hole in the center of the grouting-stop flange are formed in the grouting-stop flange; the end part of the pre-stressed anchor cable penetrates through the positioning holes to enter into the expansion assembly; and the end part of the guide line penetrates through the guide line hole to enter into the expansion assembly. The unlockable recyclable anchor cable structure is high in reliability and efficiency, avoids the defect that the unlocking force is difficult to transmit when the anchor cable is too long and does not adopt manual operation oran additional tool; the anchor cable is not snapped or damaged during unlocking; an anchoring shear connector utilizes extrusion between a steel plate and mortar to transmit tensile force of the anchor cable, the path is clear, the reliability and the efficiency are higher than the reliability and efficiency when the frictional force between an anchoring head and mortar is utilized to transmit thetensile force of the anchor cable; and the unlockable recyclable anchor cable structure has high popularization and application value.

Description

technical field [0001] The invention relates to the field of foundation pit support, in particular to an unlockable and recoverable anchor cable and a method for using the same. Background technique [0002] With the advancement of urban construction and the advancement of construction technology, deep foundation pit projects are developing towards larger and deeper trends. In foundation pit engineering, most of the side slope supports are temporary supports. After the main structure is completed, these temporary support structures will no longer play a role, but these support structures are permanently buried underground and cannot be taken out. This leads to great waste. Taking Guangzhou as an example, according to the report of "China Construction News" on April 8, 1999, as of 1999, only one project of Guangzhou Jiangwan New City had left 1000 tons of steel underground. Not only that, the temporary support cannot be taken out, but also occupies a large amount of undergr...

AI Technical Summary

Problems solved by technology

[0004] However, the above three commonly used recoverable anchor cable structures all have technical defects to a certain extent.

For example, the tensile force applied by the mechanical recovery anchor cable is large, which may cause the breakage of the prestressed anchor cable; the safety and reliability of the chemical recovery method are not good, and the fuse mechanism will also cause damage to the anchor cable; The recovery effect of the anchor cable with a short anchor length is acceptable, but as the length of the anchor cable increases, the axial stiffness and torsional stiffness of the anchor cable decrease sharply, and the applied unlocking force is difficult to transmit. Anchor cable to unlock the other end of the anchor head is not effective, it is likely to result in failure to unlock

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