Segmented Sealing Connector for Post-Tension Anchor
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Solution Overview
Problem
Existing post-tension concrete reinforcing systems face challenges in effectively preventing liquid intrusion into the exposed sections of tendons, particularly at intermediate anchorage points, due to the difficulty in maintaining a watertight seal along the length of the tendon and the susceptibility of sheathing to shrinkage and corrosion.
Innovation Solution
A method and system utilizing circumferentially segmented sealing connectors that can be segmentally attached to the tendon and anchor, featuring flexible materials and hinged or interlocking designs to form a liquid-tight assembly without the need for threading, ensuring complete encapsulation and protection from moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid-tight tubular member is placed onto the end of the anchor to cover the unsheathed portion of the tendon, then liquid intrusion is prevented, but the installation becomes difficult due to the need to slide the tubular member along the entire length of the tendon
Solution Approach 1:
The sealing connector is divided into multiple circumferential segments that can be assembled separately around the tendon and anchor assembly. These segments are then connected to form a complete sealing structure, eliminating the need to slide a single long tubular member along the entire tendon length.
Solution Approach 2:
The circumferential segments are designed to nest together through interlocking features, with each segment containing sealing elements that engage with adjacent segments and the anchor encapsulation to create a continuous liquid-tight barrier.
2Strength
If sheathing is removed proximate the anchor to allow wedges to grip the tendon, then the anchor can function properly, but the exposed tendon becomes susceptible to liquid intrusion and corrosion
Solution Approach 1:
The sealing connector provides localized protection specifically at the anchor region where sheathing is removed, while leaving the rest of the tendon sheathing intact. The sealing structure creates a liquid-tight environment around the exposed tendon portion without requiring removal of sheathing elsewhere.
Solution Approach 2:
The sealing connector is installed before the anchor is stressed, establishing a liquid-tight barrier around the exposed tendon portion before any potential corrosion can occur. This preliminary protective action prevents harmful factors from affecting the vulnerable exposed tendon.
3Object-affected harmful factors
If tape or corrosion protection materials are applied to the exposed tendon, then some protection is provided, but the protection is generally ineffective for preventing liquid intrusion
Solution Approach 1:
The sealing connector utilizes composite construction combining flexible sealing materials with rigid structural components. The flexible segments contain sealing elements that create positive liquid-tight seals, while the rigid portions provide structural support and attachment features, achieving reliable corrosion and liquid intrusion protection.
Data Source
AI summary
A sealing connector cover for a tendon in an encapsulated post-tensioning reinforcement system includes a plurality of circumferential cover segments each comprising a circumferential part of a female connector housing at one longitudinal end, and a male connector housing at another longitudinal end. Each segment has a locking element to engage a corresponding locking element on a longitudinally corresponding segment. Each circumferential segment comprises a circumferential part of a locking element in the female connector housing configured to engage the male connector housing of a longitudinally adjacent sealing connector cover or a connector on an encapsulated anchor.