Tapered Wedge Sheathing Lock for Post-Tension Anchors
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Solution Overview
Problem
Conventional dead-end anchors in post-tension systems face challenges in preventing sheathing shrinkage and liquid intrusion, and existing solutions require additional components like corrosion-protection tubes, which increase costs and installation complexity.
Innovation Solution
A wedge design with a unique tapering structure and ribbed channels that engages both the tendon and sheathing lock within the anchor cavity, ensuring proper alignment and engagement to prevent shrinkage and eliminate the need for additional protection tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional dead-end anchors are used without additional protection tubes, then device complexity and cost are reduced, but sheathing shrinkage and liquid intrusion prevention become unreliable
Solution Approach 1:
The patent combines the sheathing retention function and liquid intrusion prevention into the wedge component itself. The wedge includes a sheathing lock portion with engagement features that directly interact with the sheathing, eliminating the need for separate corrosion-protection tubes while maintaining reliable sheathing retention and liquid barrier functionality.
Solution Approach 2:
The wedge is designed to perform multiple functions: retaining the tendon through friction engagement, preventing sheathing shrinkage through the sheathing lock portion, and blocking liquid intrusion. This multi-functional design replaces the conventional single-function wedge with additional separate protection components.
2Reliability
If additional corrosion-protection tubes are added to prevent liquid intrusion, then reliability improves, but device complexity and installation complexity increase
Solution Approach 1:
The liquid intrusion prevention function is merged into the wedge structure through the sheathing lock portion. The engagement features of the sheathing lock create a seal against the sheathing, forming an integrated liquid barrier without requiring separate corrosion-protection tubes.
Solution Approach 2:
The patent extracts the liquid intrusion prevention function from separate corrosion-protection tubes and integrates it directly into the wedge component, eliminating unnecessary intermediate components while maintaining the protective function.
3Reliability
If a sheathing lock mechanism is integrated into the wedge, then sheathing retention reliability improves, but manufacturing complexity increases
Solution Approach 1:
The wedge is divided into distinct functional portions: a friction engagement surface for tendon retention and a sheathing lock portion with engagement features. This segmentation allows each portion to be optimized for its specific function while maintaining overall manufacturability through conventional forming processes.
Solution Approach 2:
Different portions of the wedge have different geometric properties tailored to their functions: the friction engagement surface has specific roughness and geometry for tendon grip, while the sheathing lock portion has engagement features sized and shaped for sheathing retention. This local differentiation achieves high reliability without requiring complex overall wedge design.
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 wedge design effectively retains the tendon, aligns the sheathing for proper engagement with the lock, and prevents shrinkage, enhancing the reliability and cost-effectiveness of the dead-end anchor system while avoiding the use of additional protection tubes.
Implementation Method 1
The friction between the wedge and the tendon retains the tendon in place
Implementation Method 2
A wedge design with a unique tapering structure and ribbed channels that engages both the tendon and sheathing lock within the anchor cavity
Data Source
AI summary
A wedge for retaining a tendon in an anchor has first, second, third, and fourth portions. The portions each have a channel. The first portion has a constant thickness from a first end to a second end. The second portion has a first end adjacent to the second end of the first portion and tapers from the first end of the second portion to a second end thereof. The third portion has a first end adjacent to the second end of the second portion and tapers from the first end of the third portion to a second end thereof. The fourth portion has a first end adjacent to the second end of the third portion and tapers from the first end of the fourth portion to a second end thereof. The channels of each of the portions have ribs.