Magnetic Positioning Head for Post-Tensioning Tendon Elongation

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Solution Overview

Problem

Current methods for measuring tendon elongation in post-tensioning concrete construction are prone to errors due to lack of standardization, imperfections in the concrete surface, and difficulties in creating clear and durable marks, leading to time-intensive and costly site revisits for quality control.

Innovation Solution

A standardized apparatus with a positioning head that makes multipoint magnetic contact with the anchor and seats flush with the tendon, allowing for precise marking and measurement, ensuring consistent alignment and reducing human error through symmetric design and optional location determination using GPS or triangulation systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional marking methods are used on tendons, then marking can be completed, but the marks are unclear and not durable due to grease on the tendon surface

Engineering Contradiction:

Improvemark clarityVSAvoidgrease interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a magnetic positioning head as an intermediary device that attaches to the anchor rather than directly marking the greased tendon. This mediator allows precise positioning and marking without direct contact with the grease-contaminated tendon surface, solving the problem of mark clarity despite grease presence.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If manual measurement methods are used, then flexibility is maintained, but measurement errors increase and time delays occur due to lack of standardization

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidelongation measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements preliminary action by pre-positioning a magnetic head on the anchor before tensioning occurs. This establishes a fixed reference point in advance, allowing for standardized and accurate measurements without requiring complex manual procedures during the actual measurement phase, thus maintaining flexibility while improving precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces traditional mechanical measurement systems with magnetic positioning and electronic measurement components. The magnetic head attaches to the anchor and uses electronic sensors to measure tendon elongation, substituting manual mechanical methods with a more precise electronic system that reduces human error and standardizes the measurement process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If site revisits are performed for quality control, then measurement verification is achieved, but time delays and costs increase

Engineering Contradiction:

Improvequality control assuranceVSAvoidsite revisit time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements feedback by providing real-time electronic measurement data during the tensioning process. The electronic sensors continuously monitor tendon elongation and provide immediate feedback, eliminating the need for delayed site revisits. This real-time feedback ensures quality control is achieved during the initial measurement, preventing time losses from subsequent verification trips.

Inventive Principle:

Principle #23Feedback

4Measurement precision

If standardized apparatus with magnetic contact is used, then measurement accuracy improves, but device complexity increases

Engineering Contradiction:

Improveelongation measurement accuracyVSAvoidapparatus structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the measurement system into distinct modular components: a magnetic positioning head that attaches to the anchor, electronic sensors for measurement, and a data processing system. This segmentation allows each component to perform its specific function independently, improving measurement accuracy while keeping the overall device complexity manageable through modular design.

Inventive Principle:

Principle #1Segmentation

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 apparatus significantly reduces measurement errors and time delays by providing accurate, real-time elongation data, enabling immediate review and reducing the need for site revisits, thus enhancing the efficiency and integrity of the post-tensioning process.

Implementation Method 1

A standardized apparatus with a positioning head that makes multipoint magnetic contact with the anchor

Methodology Applied

Scientific EffectMagnetic contact: Magnetism

Data Source

PatentUS10830655B2Method and apparatus for performing field elongation measurements

Publication Date: 2020.11.10 E-LONGATION LLC

AI summary

An improved method and apparatus for evaluating post-tensioning tendons, where the apparatus uses a positioning head placed directly into the pocket and against the anchor without making contact with the wedges as the apparatus seats on the tendon. From this position the apparatus evaluates the tendon by marking, measuring the tendon, and/or determining its location with increased reliability and precision.