Post-tensioning Wrap for Uniform Concrete Compression
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Solution Overview
Problem
Current prestressing methods for concrete structures, such as pretensioning and post-tensioning, require manual stretching of tendons, which can be labor-intensive and costly, and may not ensure uniform compression forces across the concrete member.
Innovation Solution
A post-tensioning wrap system comprising a plastic housing with cavities and tendons made of high-strength materials, where a semi-viscous medium is injected to cause the housing to swell, stretching the tendons and applying compression to the concrete article without manual tendon stretching, allowing for uniform pressure distribution and reduced labor costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If manual stretching of tendons is used in traditional post-tensioning, then the concrete member can be compressed, but the process becomes labor-intensive and costly
Solution Approach 1:
The patent replaces the traditional mechanical system of manual tendon stretching with a chemical system. A swelling agent is introduced into the housing, which chemically expands to push the tendon against the concrete, eliminating the need for manual stretching operations while achieving the same compression effect
Solution Approach 2:
The patent uses a fluid-based swelling agent that expands within a confined housing to generate mechanical force. This hydraulic-like mechanism automatically applies the compression force to the concrete through the tendon, replacing manual mechanical operations
2Force
If traditional post-tensioning methods are used, then concrete compression is achieved, but uniform pressure distribution is not ensured
Solution Approach 1:
The patent applies local quality by using a swelling agent that expands uniformly throughout the housing volume, ensuring consistent pressure distribution across the entire contact surface. The housing design with multiple contact points and the fluid nature of the swelling agent guarantee uniform local compression across the concrete member
Solution Approach 2:
The patent achieves homogeneity through the use of a swelling agent that expands uniformly in all directions within the housing. This creates a homogeneous pressure distribution across the tendon and concrete interface, ensuring consistent compression forces throughout the entire contact area
3Force
If additional concrete coatings and separate tensioning machinery are used, then prestressing can be achieved, but material and equipment costs increase
Solution Approach 1:
The patent merges multiple functions into a single integrated system. The housing serves both as a containment structure and as a pressure distribution element, while the swelling agent simultaneously acts as both the expansion mechanism and the force application medium. This eliminates the need for separate concrete coatings and external tensioning machinery
Solution Approach 2:
The housing component performs multiple functions: it contains the swelling agent, transmits the expansion force to the tendon, and distributes pressure uniformly to the concrete. This multi-functional design eliminates the need for additional specialized components, reducing both material quantity and complexity
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 solution provides efficient and uniform prestressing of concrete structures with reduced labor and material costs, eliminating the need for additional concrete coatings and separate tensioning machinery, while ensuring consistent compression forces across the concrete member.
Implementation Method 1
a medium is injected into the cavity causing the housing to swell
Implementation Method 2
tendons made of high-strength materials with an elasticity modulus greater than or equal to the concrete
Implementation Method 3
compression of the concrete article by the tendon
Implementation Method 4
tendons made of high-strength materials with an elasticity modulus greater than or equal to the concrete
Data Source
AI summary
A post-tensioning wrap includes a housing having at least one cavity and at least one tendon bonded to the housing. The wrap can be wrapped around the concrete article to equalize compression. Thereafter, a medium is injected into the cavity causing the housing to swell and compression of the concrete article by the tendon.