Monitoring and Analysis of the Collapse Process in Blasting Demolition of Tall Reinforced Concrete Chimneys
Abstract
:1. Introduction
2. Engineering Cases
3. Monitoring System and Sensors
3.1. High-Speed Photographic Observation
3.2. High-Speed Photographic Observation
3.3. Blast Vibration Monitoring
3.4. Damage Monitoring Based on Piezoelectric Ceramics
4. Analysis of Chimney Collapse Impact Monitoring Results
4.1. Image Analysis of Cylinder Wall Down-Sit Impact Process
4.2. Analysis of the Dynamic Response Characteristics of the Cylinder Wall
4.3. Blasting Vibration Characteristics Analysis
5. Conclusions
- Tall chimneys will experience multiple “weightlessness” and “overweight” effects after blasting, inducing compressive stress waves in the chimneys. When the sitting displacement is large, the broken reinforced concrete at the bottom can play a significant cushioning role, and the “overweight” effect gradually weakens until the sitting down stops.
- The piezoelectric ceramic sensor embedded in the chimney can sensitically capture the dynamic stress information of the chimney wall, and the monitoring data show that the forces inside and outside the chimney wall have obvious differences during the collapse and touching the ground. The waveforms at the monitoring points of the piezoelectric ceramic sensor are generally divided into three stages, which specifically represent the evolution process of the explosion load and the downward sitting impact of the chimney.
- The vibration induced by explosive explosion is mainly high-frequency vibration above 50 Hz, the vibration induced by chimney barrel collapse and touching the ground is mainly low-frequency vibration below 10 HZ, and the vibration characteristics have obvious differences. The response spectra of displacement, velocity, and acceleration corresponding to different damping ratios are obtained by analyzing the response spectra of blasting vibration signals. The difference of the three maps shows that the buildings with different damping coefficients have different responses to blasting vibration.
- In the process of demolition and collapse of tall reinforced concrete chimneys, due to the impact of sitting down, the supporting cylinder wall is stressed unevenly, causing the collapse direction to shift. In practical engineering, the control measures of the down-sitting impact, blasting vibration, and collapse vibration of the chimney should be fully strengthened to ensure the safety of the protection target around the blasting demolition object.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Elevation/m | Outer Radius of Cylinder Wall/cm | Inner Radius of Cylinder Wall/cm | Thickness of Cylinder Wall/cm | Thickness of Insulation Layer/cm | Thickness of Lining/cm |
---|---|---|---|---|---|
0.00 | 925 | 875 | 50 | 8 | 24 |
30.00 | 745 | 697 | 48 | 8 | 24 |
60.00 | 595 | 553 | 42 | 8 | 12 |
90.00 | 505 | 469 | 36 | 8 | 12 |
120.00 | 425 | 395 | 30 | 8 | 12 |
150.00 | 365 | 341 | 24 | 8 | 12 |
180.00 | 305 | 285 | 20 | 8 | 12 |
Measurement Point Number | Sensor Number | Sensor Location | Maximum Value | Minimal Value | ||
---|---|---|---|---|---|---|
Magnitude/mV | Time/s | Magnitude/mV | Time/s | |||
1# | CH1 | Inner | 1745.71 | 3.10 | −1079.40 | 3.12 |
CH2 | Outer | 54.16 | 2.74 | −21.55 | 0.56 | |
2# | CH3 | Inner | 230.33 | 3.14 | −24.50 | 1.60 |
CH4 | Outer | 1288.08 | 0.54 | −1979.92 | 0.55 | |
3# | CH5 | Inner | 175.93 | 3.16 | −3.28 | 3.95 |
CH6 | Outer | 208.80 | 3.72 | −130.28 | 3.73 |
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Huang, X.; Xie, X.; Sun, J.; Zhong, D.; Yao, Y.; Tu, S. Monitoring and Analysis of the Collapse Process in Blasting Demolition of Tall Reinforced Concrete Chimneys. Sensors 2023, 23, 6240. https://doi.org/10.3390/s23136240
Huang X, Xie X, Sun J, Zhong D, Yao Y, Tu S. Monitoring and Analysis of the Collapse Process in Blasting Demolition of Tall Reinforced Concrete Chimneys. Sensors. 2023; 23(13):6240. https://doi.org/10.3390/s23136240
Chicago/Turabian StyleHuang, Xiaowu, Xianqi Xie, Jinshan Sun, Dongwang Zhong, Yingkang Yao, and Shengwu Tu. 2023. "Monitoring and Analysis of the Collapse Process in Blasting Demolition of Tall Reinforced Concrete Chimneys" Sensors 23, no. 13: 6240. https://doi.org/10.3390/s23136240
APA StyleHuang, X., Xie, X., Sun, J., Zhong, D., Yao, Y., & Tu, S. (2023). Monitoring and Analysis of the Collapse Process in Blasting Demolition of Tall Reinforced Concrete Chimneys. Sensors, 23(13), 6240. https://doi.org/10.3390/s23136240