Deformable Anchor Cable Prestress and Deformation Mechanism
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Solution Overview
Problem
Existing large deformation anchor cables suffer from insufficient bearing force, complex structure, high cost, and inability to be prestressed, leading to instability and failure under complex geological conditions.
Innovation Solution
A construction method for a deformable anchor cable involving an outer sleeve, shrinkage pipe, inner sleeve, steel strand, anchor, and tray, where the steel strand is prestressed by tensioning, allowing the inner sleeve to be squeezed out of the shrinkage pipe, enhancing deformation resistance and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If cold drawing of steel bar is used to realize large deformation, then large deformation capability is achieved, but the rod is easily broken at the exit position during drawing process
Solution Approach 1:
The anchor cable is divided into multiple components: outer sleeve, inner sleeve, shrinkage pipe, steel strand, and anchor. The inner sleeve can be squeezed out of the shrinkage pipe through controlled deformation, allowing large deformation capability without breaking the entire rod at the exit position.
Solution Approach 2:
The patent applies prestress to the steel strand, which changes the stress state and allows the inner sleeve to be squeezed out of the shrinkage pipe. This parameter change enables large deformation while preventing breakage through controlled stress distribution.
2Shape
If cold drawn rod is used for large deformation, then deformation capability is improved, but prestress cannot be applied by tensioning steel strand
Solution Approach 1:
The separation of the steel strand from the inner sleeve allows independent tensioning of the steel strand to apply prestress, while the inner sleeve can still be squeezed out of the shrinkage pipe for large deformation. This segmentation enables both prestress application and deformation capability.
Solution Approach 2:
The system allows dynamic adjustment where the steel strand can be tensioned to apply prestress, and subsequently the inner sleeve can be squeezed out of the shrinkage pipe. The operations can be performed in different sequences depending on the specific engineering requirements.
3Shape
If existing large deformation anchor cable structure is used, then deformation capability is achieved, but structure becomes complex and cost increases
Solution Approach 1:
The anchor cable is segmented into functional components: outer sleeve for protection and anchoring, inner sleeve for deformation, shrinkage pipe for controlling deformation, steel strand for prestress, and anchor for rock mass anchoring. This segmentation achieves deformation capability while keeping each component simple and manufacturable.
Solution Approach 2:
The outer sleeve serves multiple functions: protecting the inner components, providing anchoring in the rock mass, and enabling the squeezing mechanism. The shrinkage pipe controls both the deformation process and prevents corrosion. This multi-functionality reduces the overall number of components needed.
4Shape
If existing large deformation anchor cable is used, then deformation capability is achieved, but bearing force becomes insufficient
Solution Approach 1:
The patent applies prestress to the steel strand, which changes the stress state and increases the bearing force. The prestress is applied through tensioning apparatus, and the resulting stress state allows the inner sleeve to be squeezed out of the shrinkage pipe while maintaining high bearing force.
Solution Approach 2:
The anchor cable uses composite construction with high-strength steel strand, outer sleeve, inner sleeve, and shrinkage pipe. The combination of these materials and the prestress application results in high bearing force while maintaining large deformation capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in a high-strength, easily prestressed anchor cable with large deformation capabilities, overcoming the issue of cold-drawn rod breakage and providing improved bearing force and structural simplicity.
Implementation Method 1
tensioning the steel strand by a tensioning apparatus to apply a prestress so as to meet design requirements, and applying a sufficient prestress to cause the inner sleeve to be squeezed out of the shrinkage pipe
Implementation Method 2
applying a sufficient prestress to cause the inner sleeve to be squeezed out of the shrinkage pipe by a distance, thus completely blocking the shrinkage end and preventing moisture in the rock mass from entering the outer sleeve to cause corrosion
Data Source
AI summary
The present disclosure relates to a construction method for a deformable anchor cable capable of being prestressed. The anchor cable includes an outer sleeve, a shrinkage pipe, an inner sleeve, a steel strand, an anchor and a tray. When the anchor cable is in use, a hole is drilled first, then the anchor cable is mounted in the drilled hole, and finally a prestress is applied to the steel strand of the anchor cable. According to the construction method, the construction is convenient; the anchor cable has the characteristics of high strength and large deformation, and can be easily prestressed; and the large deformation is realized by squeezing the inner sleeve by means of the anchor, which completely overcomes the problem of breaking a cold-drawn rod during the large deformation process.