Tamping Rod Reference Disc for Concrete Test Accuracy
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Solution Overview
Problem
Existing methods for conducting slump tests in concrete quality control are inaccurate due to worker estimation errors in tamping rod submersion depth, leading to discomfort and inefficiency, with prior tools not addressing these issues effectively.
Innovation Solution
A tubular tamping rod with a reference disc that ensures the rod's lower end reaches the correct submersion depth by engaging the container's upper edge, preventing impact with the bottom, and allowing for secure fit despite wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the worker estimates the depth of each concrete layer manually, then the test procedure can be performed, but the accuracy of the test is negatively impacted due to improper rod submersion depth
Solution Approach 1:
The patent introduces a reference disc as an intermediary component between the tamping rod and the container. The disc has a reference surface that contacts the container's top surface, serving as a mediator to transfer and maintain the correct submersion depth position, thereby eliminating the need for worker estimation and improving test accuracy
Solution Approach 2:
The reference disc is designed to be self-aligning and self-positioning. As the tamping rod is inserted into the container, the reference disc automatically contacts the container's top surface and positions itself at the correct depth, allowing the system to self-regulate the submersion depth without requiring external measurement or adjustment by the worker
2Measurement precision
If the worker repeatedly strikes the container with one's hand to gauge proper submersion depth, then the submersion depth can be controlled, but the worker experiences discomfort, pain and physical burden
Solution Approach 1:
The reference disc acts as a mechanical intermediary that replaces the worker's hand as the reference point for submersion depth. Instead of the worker's hand repeatedly contacting the container, the reference disc permanently mounted on the rod serves this function, eliminating physical burden while maintaining depth control precision
Solution Approach 2:
The reference disc is pre-positioned on the tamping rod at the correct submersion depth before the testing begins. This preliminary positioning eliminates the need for the worker to repeatedly adjust and gauge depth during the test, preventing physical burden while ensuring consistent depth control
3Productivity
If the tamping rod is inserted to maximum depth without guidance, then consolidation is achieved, but the rod may impact the container bottom causing inaccurate results
Solution Approach 1:
The reference disc serves as a mechanical stop and guide that prevents the tamping rod from being inserted too deeply. The disc contacts the container's top surface and physically limits the rod's insertion depth, ensuring the rod tip reaches the concrete bottom for proper consolidation without striking the container bottom, thus maintaining both efficiency and reliability
Solution Approach 2:
The reference disc provides a pre-established mechanical constraint that cushions against excessive insertion. By limiting the rod's travel distance before impact can occur, the disc prevents the harmful effect of striking the container bottom while allowing sufficient insertion depth for effective consolidation
Data Source
AI summary
A method and an apparatus for consolidating concrete test samples include a tubular tamping rod with a reference disc slidably mounted thereon. When performing a quality control test, a worker pours a concrete specimen into a test container. The tamping rod is positioned adjacent to the container with its lower end at a maximum acceptable submersion depth relative to the specimen. The reference disc is then positioned to engage the upper edge of the container when the lower end of the rod is at the maximum acceptable submersion depth. When the worker reciprocates the tamping rod within the specimen, engagement of the reference disc with the upper edge of the container indicates that the lower end of the rod has reached the maximum acceptable submersion depth.