Post-Tension Anchor Sheathing Fixing Wedge Mechanism
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Solution Overview
Problem
Conventional dead-end anchors in post-tension systems face challenges in preventing the shrinkage of sheathing over time, which leads to mechanical instability and potential liquid intrusion, requiring additional sealing tubes that increase costs and installation complexity.
Innovation Solution
An apparatus with a fixing means, such as wedge members or clip members, is integrated into the anchor body to engage the sheathing and resist shrinkage forces, providing a frictional fit within the anchor's cavity and a liquid-tight seal without the need for external sealing tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dead-end anchors are used without integrated fixing means, then the anchor structure is simpler and easier to manufacture, but the sheathing shrinks over time leading to mechanical instability and liquid intrusion
Solution Approach 1:
The patent combines the sheathing fixing function with the existing anchor structure by integrating fixing means (wedge members or clip members) into the anchor body. This merging approach prevents sheathing shrinkage while avoiding the need for separate external sealing tubes, thus improving reliability without significantly increasing device complexity.
Solution Approach 2:
The fixing means is designed to automatically engage with the sheathing during the normal anchoring process. The wedge members or clip members self-position and self-engage with the sheathing without requiring additional manual intervention or separate installation steps, allowing the anchor system to serve its own sheathing fixation needs.
2Object-affected harmful factors
If additional sealing tubes are added to prevent liquid intrusion, then liquid-tight sealing is improved, but the installation complexity and cost increase
Solution Approach 1:
The patent merges the liquid sealing function with the sheathing fixation function by using the same fixing means (wedge members or clip members) to both secure the sheathing and create a liquid-tight barrier. This eliminates the need for separate external sealing tubes, reducing installation complexity while maintaining effective liquid intrusion prevention.
Solution Approach 2:
The fixing means serves multiple functions simultaneously: it mechanically secures the sheathing to prevent shrinkage, creates frictional engagement for stability, and forms a liquid-tight seal. This multi-functionality eliminates the need for dedicated sealing components, simplifying installation while addressing both mechanical stability and liquid protection requirements.
3Stability of the object's composition
If fixing means is integrated into the anchor body, then sheathing stability is improved, but manufacturing complexity increases
Solution Approach 1:
The fixing means is designed as separable components (wedge members or clip members) that can be manufactured independently and then assembled into the anchor body. This segmentation allows for specialized manufacturing of each component using optimal processes, then simple assembly into the final anchor structure, minimizing overall manufacturing complexity while achieving stable sheathing fixation.
Solution Approach 2:
The fixing means is designed with specific local geometric features (tapered surfaces for wedges, biting edges for clips) that provide the necessary mechanical engagement and stability. These localized quality features are concentrated only where needed for sheathing contact, allowing the rest of the anchor body to maintain simple manufacturing characteristics.
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
Effectively prevents sheathing shrinkage and liquid intrusion, ensuring a strong and reliable connection while eliminating the need for additional sealing tubes, making the solution easy to install, cost-effective, and simple to manufacture.
Implementation Method 1
a first wedge member and a second wedge member interposed between the end of the sheathing and the tendon so as to engage the sheathing. The sheathing is in frictional contact with a wall of the cavity and a surface of the wedge members.
Implementation Method 2
a pair of clip members engaged with the sheathing in the cavity. The pair of clip members has an edge biting into the sheathing. The pair of clip members are interposed between a wall of the cavity and the sheathing.
Data Source
AI summary
An apparatus for fixing the sheathing of an end of a tendon within an anchor body of a post-tension anchor system has an anchor body with a cavity formed therein, a tendon extending into the cavity, a fixing element engaged with the sheathing of the tendon for fixing a position of the sheathing on the tendon, and a pair of wedges in engagement with the unsheathed portion of tendon within the anchor body. The fixing element is positioned within the cavity. The fixing element can either be a wedge member interposed between the sheathing and the tendon so as to frictionally engage the tendon or a clip member engaged with the sheathing.