Delay Anchor Twist-Lock Coupling for Post-Tension Tendon Protection
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Solution Overview
Problem
Existing post-tension concrete construction methods face challenges in maintaining the integrity of tendons across construction phases, as they are prone to corrosion and difficult to assemble, leading to potential structural weaknesses and early failure due to exposure to elements during phase delays.
Innovation Solution
A delay anchor system comprising a coupling sleeve with internal locking channels, a stressing barrel with radially protruding locking lugs, and a compression spring, which allows for easy assembly and protection from the elements, ensuring a robust and corrosion-resistant connection between tendon phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tendons are left exposed between construction phases, then construction scheduling flexibility is improved, but tendon reliability deteriorates due to corrosion from element exposure
Solution Approach 1:
The tendon system is segmented into multiple sections with intermediate anchors allowing independent stressing of each section. This enables the tendon to be terminated at construction joints between phases while maintaining structural integrity, allowing flexible construction scheduling without exposing tendons to corrosion.
Solution Approach 2:
Intermediate anchors serve as intermediary components that allow the tendon to be stressed and protected at construction joints. These anchors enable the tendon to transition from one concrete phase to the next without remaining exposed, thus protecting reliability while maintaining scheduling flexibility.
2Stability of the object's composition
If traditional tendon connection methods are used, then tendon continuity is achieved, but device complexity increases and assembly difficulty arises
Solution Approach 1:
The coupling sleeve integrates multiple functions into a single component: it provides tendon splicing, structural connection, and alignment features. By merging these functions, the device achieves tendon continuity while reducing overall complexity compared to traditional multi-component connection systems.
Solution Approach 2:
The intermediate anchor system serves multiple functions: it anchors the tendon during construction, allows for stressing operations, provides a connection point for subsequent phases, and enables tendon termination and protection. This multi-functionality reduces the need for separate specialized components.
3Productivity
If intermediate stressing is used for tendons at construction joints, then formwork removal is enabled, but tendon exposure to elements increases causing corrosion
Solution Approach 1:
The tendon is stressed and anchored at the construction joint before the next concrete phase is placed. This preliminary action allows formwork removal while the tendon is already protected within the concrete structure, preventing exposure to elements that would cause corrosion.
Solution Approach 2:
The construction joint, which initially creates a vulnerability point for tendon exposure, is converted into a protective location. By placing the intermediate anchor and stressing the tendon at the joint before concrete placement, the concrete itself becomes the protective covering, converting the potential harm of exposure into a beneficial protected state.
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 delay anchor system enables secure termination and later coupling of tendons across construction phases, protecting them from corrosion and facilitating easier assembly, thus enhancing structural integrity and durability.
Implementation Method 1
a compression spring biasing the wedge-sets apart
Implementation Method 2
The stressing barrel has a plurality of radially protruding locking lugs corresponding to the locking channels of the coupling sleeve and slidable therein to provide a twist-lock insertion feature
Implementation Method 3
An encapsulation insert is engaged to the receptacle of the anchor as to form a liquid-tight seal therewith
Data Source
AI summary
A delay anchor (delay anchor) for coupling terminal ends of two discontinuous tendons together resulting in a structurally continuous single tendon. The delay anchor generally comprises a coupling sleeve seating one set of tendon wedges for clamping one tendon end, and a stressing barrel seating a second set of tendon wedges for the other tendon end, the stressing barrel being attached to the coupling sleeve, and a compression spring biasing the two assemblies apart. The coupling sleeve is internally configured with a plurality of internal locking channels, and the stressing barrel has a plurality of radially protruding locking lugs slidable therein to provide a twist-lock insertion feature. An encapsulation insert is engaged to one side of an intermediate anchor and an encapsulation sleeve locks onto the encapsulation insert and covers and weather seals all internal components of the delay anchor.