Splice Sleeve Grout Compactness Detection via Impact Echo
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Solution Overview
Problem
Current methods for detecting grout compactness in splice sleeves, such as Electric Resistance Test Method, Embedded Steel Wire Drawing Method, and Ultrasonic Pulse-Echo Test, face limitations like embedded sensors being damaged during grouting, high costs, and inability to conduct large-scale tests, leading to unreliable results and potential safety hazards in prefabricated construction.
Innovation Solution
A device and method utilizing a rigid preloading member, force transmission rod, telescopic adjustment member, vibration sensor, and data acquisition system, where a preload is applied to the rebar via a force transmission rod, and vibration signals are analyzed in time-domain and frequency-domain to assess grout compactness, allowing for qualitative and quantitative determination and reusable testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If embedded sensors are used for detection, then measurement precision is improved, but device complexity and cost increase, and reliability decreases due to sensor damage during grouting
Solution Approach 1:
The method applies preliminary action by performing the detection after grouting is completed, rather than embedding sensors before grouting. The detection device is applied to the grouted splice sleeve after the grouting process, avoiding the risk of sensor damage during grouting while still achieving accurate measurement of grout compactness through impact echo testing.
Solution Approach 2:
The detection device acts as an intermediary by using impact echo waves that propagate through the grouted splice sleeve to detect internal quality. Instead of embedding sensors directly in the structure, the device uses external impact and listening points to indirectly measure grout compactness, avoiding direct contact with the grouting process.
2Measurement precision
If embedded sensors are used for detection, then measurement precision is improved, but productivity decreases due to inability to conduct large-scale tests
Solution Approach 1:
The detection method is applied after grouting completion, allowing multiple splice sleeves to be detected sequentially without interrupting the grouting process. This enables large-scale testing productivity while maintaining measurement precision through the standardized impact echo testing procedure.
3Ease of operation
If impact echo test is used, then ease of operation is improved, but measurement precision deteriorates due to wave superposition and insignificant undulation effects
Solution Approach 1:
The method applies local quality by focusing the impact at specific listening points on the splice sleeve. By strategically selecting impact and listening locations, the detection system captures localized vibration characteristics that reflect grout compactness, improving measurement precision while maintaining ease of operation.
Solution Approach 2:
The detection device applies partial action by using selective impact locations and listening points rather than comprehensive coverage. This focused approach captures the critical vibration signals needed for accurate grout compactness assessment without requiring excessive measurement points, balancing precision and operational simplicity.
4Measurement precision
If ultrasonic pulse-echo test is used, then measurement precision is improved for small defects, but device complexity and cost increase
Solution Approach 1:
The method replaces the complex ultrasonic mechanical system with a simpler impact echo approach. Instead of using ultrasonic transducers and high-frequency wave generation equipment, the device uses simple impact mechanisms and vibration sensors, reducing device complexity while achieving effective detection of grout compactness.
Solution Approach 2:
The detection device uses simple, inexpensive impact tools and vibration sensors rather than expensive ultrasonic equipment. The impactor can be a simple hammer or weight, and the sensors are basic vibration transducers, making the system cost-effective and suitable for widespread use in construction quality control.
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
Enables reliable, repeatable, and cost-effective detection of grout compactness in splice sleeves, improving safety and efficiency in construction projects by providing a detachable and easily controllable detection device that can handle multiple tests without damaging sensors.
Implementation Method 1
The vibration signal from the lateral vibration of the rebar can be acquired with the aid of the strain gauge installed on the force transmission rod
Data Source
AI summary
The invention relates to a device and method for detecting the grout compactness of splice sleeve, the device comprising a preloading member, a force transmission rod, a telescopic adjustment member, a vibration sensor and a data acquisition system. The rigid preloading member is used to fix the force transmission rod to the wall where the connecting structure of the splice sleeve is located, so that the end of the force transmission rod can be securely fastened to a rebar surface of a splice sleeve to be detected; the vibration sensor is fixed to the force transmission rod; the data acquisition system is used to acquire vibration signals from the vibration sensor. The grout compactness of splice sleeve is quantitatively analyzed, and a time-domain and frequency-domain signal may be used to obtain a peak-to-width ratio RNpw and a peak frequency ΩPeak signal to serve as a standard for the quantitative analysis.