Sealing Cap for Post-Tension Anchor Liquid Intrusion
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Solution Overview
Problem
Conventional post-tension anchorages face challenges in preventing liquid intrusion due to sheathing shrinkage, which compromises the integrity of the seal between the sheathing and the anchor, especially in intermediate anchors where the sheathing tends to shrink away from the dead-end anchorage, leading to potential moisture and contaminant ingress.
Innovation Solution
A sealing cap with a tubular body and a flange is designed to create a liquid-tight seal between the intermediate anchor and the sheathing of the tendon, featuring a split seal that can easily slide over the sheathing and be installed, using a more pliable material than the tubular body to ensure a secure and removable fit, thereby preventing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional seal is used to prevent liquid intrusion, then the seal may maintain initial contact with the sheathing, but the seal cannot accommodate sheathing shrinkage over time, leading to seal failure and liquid ingress
Solution Approach 1:
The seal is designed with dynamic characteristics, featuring a durometer range of 30-50 that allows it to deform and adapt to sheathing shrinkage over time. The seal transitions from an initial tight fit to a sustained sealing position, maintaining contact with the sheathing despite dimensional changes during service life.
Solution Approach 2:
The seal's material properties are specifically selected with a durometer range of 30-50, representing a parameter change from rigid to compliant material behavior. This parameter selection enables the seal to accommodate the dimensional changes in the sheathing while maintaining liquid-tight sealing throughout the service life.
2Reliability
If the seal material is made more pliable to accommodate sheathing shrinkage, then the seal can maintain contact over time, but the seal becomes difficult to install and may not fit precisely
Solution Approach 1:
The durometer range of 30-50 represents an optimized parameter that balances pliability and installability. This specific range provides sufficient compliance to accommodate sheathing shrinkage while maintaining enough structural integrity to be installed without excessive difficulty, resolving the contradiction between seal contact maintenance and installation ease.
3Ease of manufacture
If a single-material seal is used for simplicity, then the seal is easy to manufacture, but the seal cannot provide both structural support and flexible sealing contact
Solution Approach 1:
Rather than using composite materials, the invention achieves differentiated performance through parameter changes in a single material system. The durometer range of 30-50 enables the homogeneous seal to provide both the structural support needed for installation and the flexible compliance required for maintaining sealing contact against shrinking sheathing.
4Reliability
If the seal is designed to fit tightly initially, then liquid intrusion is prevented at installation, but the tight fit prevents accommodation of sheathing shrinkage, leading to seal failure
Solution Approach 1:
The seal incorporates dynamic characteristics through its material selection (durometer 30-50), enabling it to transition from an initial tight fit that prevents liquid intrusion to a adapted state that accommodates sheathing shrinkage. This dynamic behavior maintains both initial effectiveness and long-term adaptability.
Solution Approach 2:
The specific durometer range of 30-50 represents a parameter change that enables the seal to provide both initial tight sealing and subsequent adaptability to dimensional changes. This parameter selection resolves the contradiction between initial seal effectiveness and adaptability to shrinkage.
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 sealing cap effectively prevents liquid and contaminant entry into the anchor system by forming a reliable liquid-tight seal, ensuring the structural integrity and longevity of the post-tension anchorages despite sheathing shrinkage, and is easy to install and manufacture.
Implementation Method 1
The seal is formed of a material more pliable than the material of the tubular body
Data Source
AI summary
A sealing cap for an anchor of a post-tension anchorage system has a tubular body, a flange formed on an end of the tubular body, and a seal positioned adjacent an interior wall of the tubular body. The flange has a connector formed on a circumferential surface thereof for detachably engaging the flange with a tubular section of the anchor. The seal is positioned against the interior wall of the tubular body. The seal has a tubular shape so as to extend entirely around the interior wall. The seal is positioned in liquid-tight relation between the interior wall of the tubular body and a sheathed portion of a tendon extending from the anchor. The seal is inserted between the sheathed portion and the interior wall of the tubular body.