Thermal Sensor String for Concrete Anomaly Detection
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Solution Overview
Problem
Current methods for assessing the quality and integrity of deep foundations, such as cross hole sonic logging and sonic integrity testing, face limitations including safety concerns, limited zone of material assessment, and inability to detect anomalies outside the reinforcement cage, making it difficult to ensure the quality and geometry of deep foundation construction.
Innovation Solution
The use of a retrievable string of thermal sensors placed within access bores or conduits positioned across and around the foundation element to monitor temperature variations during concrete curing, allowing for the identification and estimation of anomalies in concrete or grout, and providing a 3D representation of temperature variations to determine the extent and location of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross hole sonic logging is used to assess foundation quality, then measurement capability is improved, but safety concerns and limited zone of material assessment occur
Solution Approach 1:
The patent replaces the mechanical/acoustic system of sonic logging with a thermal sensing system. Temperature sensors monitor the thermal field during concrete curing to detect anomalies, substituting mechanical wave propagation with thermal diffusion-based detection. This resolves the contradiction by providing safe, comprehensive monitoring without the limitations of sonic methods.
Solution Approach 2:
The patent changes the detection parameter from acoustic properties (sonic logging) to thermal properties (temperature distribution). By monitoring temperature variations during concrete curing, the system detects anomalies through thermal parameter changes rather than mechanical wave responses, achieving both improved safety and broader assessment coverage.
2Measurement precision
If sonic integrity testing is used, then concrete integrity detection is improved, but inability to detect anomalies outside reinforcement cage occurs
Solution Approach 1:
The patent replaces acoustic wave-based detection with thermal field monitoring. Temperature sensors distributed throughout the concrete capture thermal information from all regions, including areas outside the reinforcement cage, eliminating the information loss inherent in sonic testing which is limited by cage geometry.
Solution Approach 2:
The patent transitions from one-dimensional acoustic wave propagation along specific paths to three-dimensional thermal field monitoring. Temperature sensors distributed in multiple dimensions capture thermal diffusion patterns throughout the entire concrete volume, providing comprehensive anomaly detection coverage that sonic methods cannot achieve.
3Ease of operation
If traditional assessment methods are used, then construction process monitoring is simplified, but detailed quality assessment of construction material is lost
Solution Approach 1:
The patent employs the concrete's own thermal field during curing as the detection medium. Temperature sensors monitor the self-generated thermal patterns of curing concrete, utilizing the material's inherent thermal properties for quality assessment. This self-service approach maintains operational simplicity while delivering detailed quality information.
Solution Approach 2:
The patent substitutes complex mechanical assessment procedures with straightforward thermal monitoring. By continuously measuring temperature variations during curing, the system automatically detects quality issues without requiring complex operational interventions, achieving both simplicity and precision.
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
This method provides a cost-effective, safe, and detailed assessment of the quality of the construction material at the base of a shaft, accurately monitors concrete level, and detects debris or defects, improving the reliability of deep foundation construction without the need for sonic logging access tubes.
Implementation Method 1
changes in the temperature profile associated with the end bearing material of the base. Significant variations in the temperature in real time, as a result of changes in the localized concrete and/or grout curing temperature due to heat generated by hydration
Data Source
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AI summary
Embodiments relate to a method and apparatus for investigating the uniformity of concrete and/or grout. Embodiments can identify the existence of one or more anomalies in the uniformity of concrete and/or grout, and/or determine or estimate the size, shape, type, and/or location of one or more anomalies in the uniformity of concrete and/or grout. Embodiments can utilize a string of temperature measuring sensors placed within one or more access bore(s), such as tube(s), positioned at least partially within the concrete and/or positioned proximate the concrete. The measurements obtained from the temperature measuring sensors can then be used to assist in the identification of existence of, size of, type of, shape of, and/or location of anomalies in the concrete and/or grout.