Non-destructive Anchor Bolt Pull-out Capacity Estimation
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Solution Overview
Problem
Current methods for evaluating the load-carrying capacity of concrete anchors rely on destructive testing, lacking a non-destructive approach to estimate their pull-out strength effectively.
Innovation Solution
A non-destructive method using a Schmidt hammer to record rebound values, which are then correlated with predetermined bolt diameter, embedment length, and concrete strength to estimate the pull-out capacity of concrete anchors, facilitated by control processing circuitry and a system that includes GPS for location triangulation and data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional destructive testing methods are used to evaluate anchor bolt pull-out capacity, then accurate measurement of load carrying capacity is achieved, but the anchors are damaged and extensive equipment and time are required
Solution Approach 1:
The patent replaces the conventional mechanical destructive testing system with an acoustic emission-based detection system. Acoustic sensors detect stress waves generated by micro-cracks and deformation in the anchor bolt during loading, allowing non-destructive evaluation of pull-out capacity. This substitution eliminates the need for physical destruction while maintaining measurement capability through acoustic signal analysis.
Solution Approach 2:
The patent introduces acoustic emission signals as an intermediary between the anchor bolt and the evaluation system. Instead of directly measuring mechanical failure, the system detects acoustic waves emitted by the bolt during stress application. These acoustic signals serve as mediators that carry information about the bolt's structural integrity and load capacity without requiring actual failure.
2Reliability
If conventional pull-out testing is performed with extensive equipment, then reliable quality assurance is achieved, but testing time and operational complexity increase
Solution Approach 1:
The patent extracts the essential evaluation function from the complex conventional testing system. By focusing solely on acoustic emission detection during controlled loading, the system removes unnecessary equipment such as extensive data acquisition systems, multiple sensors, and complex analysis apparatus. This extraction maintains reliability by concentrating on the most informative signal while reducing overall system complexity and testing time.
Solution Approach 2:
The anchor bolt itself serves the dual function of being both the test subject and the signal source. During loading, the bolt naturally generates acoustic emission signals that reveal its structural state. This self-service mechanism eliminates the need for external measurement devices attached to the bolt, simplifying the testing procedure and reducing time requirements while maintaining reliable quality assurance.
3Measurement precision
If conventional testing equipment and procedures are used, then comprehensive material testing is achieved, but skilled labor and complex setup are required
Solution Approach 1:
The patent creates a universal testing approach where the acoustic emission detection system can evaluate multiple anchor bolt parameters through a single integrated procedure. The same acoustic sensors and analysis software can assess pull-out capacity, material strength, and structural integrity without requiring different equipment or procedures for each measurement type. This multi-functionality simplifies operation while maintaining comprehensive evaluation capability.
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 allows for quick, reliable, and cost-effective estimation of pull-out strength without damaging the anchors, enabling real-time monitoring and quality assurance in construction projects.
Implementation Method 1
The Schmidt hammer is configured to strike the bolt during a test event and to record a rebound value for the bolt
Data Source
AI summary
Embodiments include an apparatus for determining a pull-out capacity of a bolt disposed in concrete. The apparatus includes control processing circuitry and a Schmidt hammer electrically connected to the control processing circuitry. The Schmidt hammer is configured to strike the bolt during a test event and to record a rebound value for the bolt. The control processing circuitry is configured to calculate an estimated pull-out strength for the bolt using the rebound value of the bolt that resulted from the test event, a predetermined bolt diameter, a predetermined bolt embedment length in the concrete, and an estimated predetermined strength of concrete. The apparatus also includes a remote computer configured to communicate with the control processing circuitry and to store an estimated pull-out strength of the bolt. The control processing circuitry includes a memory and a database.