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Real-time detection system of penetration of hydraulic hammer sunk piles
Published:2024-12-24 author:LI Huimin, CUI Rui, ZHANG Kaiwen. Browse: 19 Check PDF documents
Real-time detection system of penetration of hydraulic hammer sunk piles


LI Huimin, CUI Rui, ZHANG Kaiwen

(College of Mechanical Engineering, Donghua University, Shanghai 201620, China)


Abstract:  Aiming at the problems of high subjectivity and inconvenience of effective record in real-time detection of penetration in the process of hammer sinking pile at traditional site, a real-time detection device of penetration of hydraulic hammer sinking pile with non-contact measurement was proposed. Firstly, the motion characteristics of hydraulic hammer pile were analyzed, the motion curve of pile after one impact was obtained, and the overall scheme of the detection system was designed. Then, the hardware and software of the detection system were designed, the laser sensor was selected for non-contact measurement, the vibration signal was filtered by the microprocessor, and the Mann-Kendall mutation point detection algorithm was used to divide the data to obtain the stable value of pile driving, and the effective penetration after hammer was extracted. Subsequently, the liquid crystal display screen was used to display the penetration data, and the data was sent to the server for remote storage, or the data was stored in the memory card for local storage. Finally, the penetration test and stop cue test were conducted at a certain site. The research results show that: the system instead of the traditional measurement method, can be more scientific, standardized measurement of penetration, and  timely notify the staff to stop the hammer in penetration to meet the stop hammer standard. The accuracy of its stop hammer prompt reaches 96.9%, it meets the actual needs of the user, and significantly improves the efficiency of the construction.

Key words:  contactless measurement; hammer piling; penetration test; stopping hammers prompt; realtime detection; change point
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